FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
AND
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“METHOD AND SYSTEM OF SWITCHING FROM CAT-NARROW BAND (NB) TO LEGACY CAT-1/4 FOR EMERGENCY SERVICE”
We, RELIANCE JIO INFOCOMM LIMITED, an Indian National, of, 3rd Floor, Maker Chamber-IV, 222, Nariman Point, Mumbai- 400021, Maharashtra, India.
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present invention relates to the technical field of wireless communication. More particularly, the present invention relates to a switching mechanism between CAT-Narrow Band (NB) channel to CAT-1/4 for emergency service.
BACKGROUND
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.
The Internet of Things (IoT) is a network of devices, vehicles, home appliances, and other items embedded with electronics, software, sensors, actuators, and connectivity which can be readable, recognizable, locatable, addressable, and controllable via an IoT communications network that enables these things to connect and exchange data, creating opportunities for more direct integration of the physical world into computer-based systems, resulting in efficiency improvements, economic benefits, and reduced human exertions. The “Internet of things” (IoT) concept is getting more and more popular, and devices, such as sensors, actuators and everyday objects including the coffee makers, washing machines, headphones, lamps and wearable devices, etc. are being increasingly looked upon as potential IoT devices. IoT involves extending Internet connectivity beyond standard devices, such as desktops, laptops, smartphones and tablets, to any range of traditionally dumb or non-internet-enabled physical devices and everyday objects. Embedded with technology, these devices can communicate and interact over the Internet, and they can be remotely monitored and controlled. The term "Enterprise IoT" refers to devices used in business and corporate settings in a network of physical objects that contain

embedded technology to communicate and sense or interact with their internal states or the external environment. Here, IoT refers to Internet-connected physical devices, in many cases everyday objects (things) that can communicate their status, respond to events, or even act autonomously. This enables communication among those things, closing the gap between the real and the virtual world and creating smarter processes and structures that can support us without needing our attention. IoT has evolved from the convergence of wireless technologies, micro-electromechanical systems (MEMS), and the Internet. An IoT device is generally provisioned with an IP address to provide it with the capability of transferring data and receive control signals over an IP network using the standard Internet protocols such as TCP/IP which is being exclusively used on the Internet.
An IoT device is generally provisioned with an IP address to provide it with the capability of transferring data and receive control signals over an IP network using the standard Internet protocols such as TCP/IP which is being used on the Internet.
Recently, 3GPP has introduced a new technology NB-IoT in release 13. The low-end IoT applications can be met with this technology. This technology has better performance than Low Power Wide Area Networks (LP-WAN). It has taken efforts to address IoT markets with completion of standardization on NB-IoT. The NB-IoT technology has been implemented in licensed bands of LTE, which are used for exploiting this technology. This technology makes use of a minimum system bandwidth of 180 kHz i.e. one PRB (Physical Resource Block) is allocated for this technology. The NB-IoT can be seen as a separate RAT (Radio Access Technology). The NB-IoT can be deployed in 3 modes: “in-band”, “guard band” and “standalone”. In the “in-band” operation, resource blocks present within LTE carrier are used. The inner resource blocks are not used as they are allotted for synchronization of LTE signals. In “guard band” operation, resource blocks between LTE carriers that are not utilized by any operator are used. In

“standalone” operation, GSM frequencies are used, or possibly unused LTE bands are used. Release 13 contains important refinements like extended or enhanced discontinuous reception (eDRX) and power save mode (PSM). The PSM ensures battery longevity in release 12 and is completed by eDRX for devices that need to receive data more frequently.
The NB-IoT technology focuses on devices like meter reading of water and electricity consumption that are stationery. Some of the use cases are facility management services, fire alarms for home and commercial properties, tracking of persons and objects. The industries where NB-IoT services can add value are Smart city, smart home, safety and security, agriculture, health care and Energy. Another example for IoT industry includes logistic tracking. The tracking devices on shipping containers send huge volumes of sensor data that are collected and taken for analysis in order to make sure that real-time tracking of shipment locations can be made possible. The output display units are used for receiving alerts and optimized with service recommendations.
The NB-IoT technology addresses some of the key IoT requirements.
• Battery lifetime of the devices increases.
• Improved network coverage.
• Cost of the devices is reduced
• Multiplexing of devices met for capacity requirements.
• Support a massive number of devices
• Low power consumption
• Use of low-cost devices
• Provides excellent coverage.
In an NB-IoT deployment, the NB-IoT cells have a 20db gain over other categories like CAT-1 cells. As such, the NB-IoT Carrier can support much larger areas when compared to a CAT-1 base station or channel. Typically, in NB-IOT scenario, the

same base station provides the NB-IoT channels for a device. The same or a different base station can provide a channel for a CAT-1 or a CAT-4 operation due to the difference in the NB-IoT and other category cell coverage areas.
As huge number of IoT devices are connected, and as businesses use applications to parse IoT data, connectivity becomes a real concern for both the CAT-1 and the CAT-NB-IoT. When it comes to IoT ecosystem development, limited network bandwidth could be the weak link in the chain as latency stifles progress.
As IoT UEs are evolving and may require to perform service such as emergency call, however, NB-IoT does not support emergency services, and thus, there is a challenge for providing such emergency service in IoT system. Ideally, the IoT UEs should be able to latch on the legacy RATs for faster and quicker emergency service delivery, and it would be better to switch to CAT-1 for such emergency service as CAT NB- only supports lower Downlink (DL) data rate in the order of few kbps. For instance, in case of NB-IoT devices like Global Positioning System (GPS) trackers such as child GPS trackers, there may be a feature to initiate an emergency call in case of emergency. However, this emergency call may not initiate since the NB-IoT device is unable to support high data rates required for the call. Due to this deficiency, the purpose of the IoT GPS tracker is defeated leaving the user dissatisfied.
The current 3GPP specification Release 13 does not specify any method for IoT Device to select the other RATs when there is need to avail an emergency service. The specification does not define any solution on how the IoT UE may be able to latch on the other RATs for making emergency service delivery. There is primarily a challenge for latching on the high bandwidth RATs for emergency service delivery. This is necessary as the high bandwidth channel will help to provide an efficient way of emergency connectivity to billions of devices that have to be managed efficiently to handle emergency service requests. Also, as the numbers grow, for the IoT devices in future there needs to be an efficient

architecture for latching on the high bandwidth RATs for emergency service request for quicker service delivery.
Thus, there exists a need in the art to find a solution for a system and a method to support latching on the high bandwidth RATs (CAT-1/4) for delivery of emergency services so that the high bandwidth channel will help to provide efficient way of emergency connectivity to billions of devices that have to be managed efficiently to handle emergency service requests.
Therefore, in view of the above shortcomings in the existing approaches, there is a need in the art to provide an efficient solution of switching from CAT-NB channel to CAT-1/4 channel for emergency services.
SUMMARY
This section is provided to introduce certain objects and 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.
In order to overcome at least a few problems associated with the known solutions as provided in the previous section, an object of the present invention is to provide a system and method that can support latching on the high RATs (CAT-1/4) for emergency service to provide efficient way of emergency connectivity to billions of devices that has to be managed efficiently to handle emergency service requests. Another object of the present disclosure is to provide a system and a method to address the issue of connectivity of NB-IoT devices for emergency service request. Yet another object of the present disclosure is to provide a system and a method to enable emergency connectivity in the NB-IoT device by moving to Cat-1 legacy system. Yet another object of the present disclosure is to provide a system and a method to save on power of the IoT device due by switching back to NB-IOT channels/cells from CAT-1/4 cells solution after completion of the emergency service requests. Yet another object

of the present disclosure is to provide a system and a method to facilitate emergency service in the network due to no connectivity in NB-IoT channels/cells via CAT-1/4 cells solution.
In order to achieve at least some of the above-mentioned objectives, the present disclosure provides a method and system of switching a user equipment from a narrow band channel to a CAT-1/4 channel in a wireless network for an emergency service request. A first aspect of the present invention relates to a method of switching a user equipment from a narrow-band channel to a Category- 1/4 (CAT-1/4) channel in a wireless network, said user equipment being currently connected to said narrow-band channel. The method comprising the user equipment identifying a category of service for a service request generated at the user equipment. Subsequently, the user equipment switches from the narrow band channel to a CAT-1/4 channel based at least on the identified category of the service request being an emergency service. Thereafter, the user equipment transmits the service request to a network entity of the wireless network, said service request comprising an establishment cause for availing the emergency service.
Another aspect of the present disclosure relates to a user equipment connected to a wireless network. The user equipment comprises an application module, a transceiver, a memory unit and a processor. The processor is connected to the memory unit, the application module and the transceiver. The processor is configured to identify a category of service for a service request generated at the user equipment. The processor is also configured to switch the user equipment from the narrow band channel to a CAT-1/4 channel based at least on the identified category of the service request being an emergency service. The application module is connected to the memory unit, the transceiver and the processor. The application module is configured to transmit the service request to a network entity of the wireless network via the transceiver, said service request comprising an establishment cause for availing the emergency service.

BRIEF DESCRIPTION OF DRAWINGS
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 invention. Also, the embodiments shown in the 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 invention. 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.
Fig.1 illustrates a general overview of the network environment [100] in which the present invention is implemented, in accordance with exemplary embodiments of the present disclosure.
Fig.2 illustrates an exemplary block diagram of a user equipment [200], in accordance with exemplary embodiments of the present disclosure.
Fig.3 illustrates an exemplary diagram of the network entity [300], in accordance with exemplary embodiments of the present disclosure.
Fig. 4 illustrates an exemplary method flow diagram [400] depicting method for switching a user equipment from a narrow band channel to a CAT-1/4 channel in a wireless network for an emergency service, in accordance with exemplary embodiments of the present disclosure.
Fig. 5 illustrates an exemplary flow diagram [500] depicting an exemplary method for implementation of emergency call trigger in legacy network, in accordance with exemplary embodiments of the present disclosure.
The foregoing shall be more apparent from the following more detailed description of the disclosure.

DESCRIPTION OF THE INVENTION
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 all 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.
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 be made in the function and arrangement of elements without departing from the spirit and scope of the invention as set forth.
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.
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. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc. When a process corresponds to a function, its termination can correspond to a return of the function to the calling function or the main function.
As used herein, the “IoT device” or "user equipment“, refers to any electrical, electronic, electromechanical and computing device. The IoT device is capable of receiving and/or transmitting one or parameters, performing function/s, communicating with other IoT devices as well as non-IoT devices and transmitting data to the devices. The IoT device may have a processor, a display, a memory unit, a battery and an input-means such as a hard keypad and/or a soft keypad. The at least one IoT device may include, but is not limited to, a thermostat, an electric switch, a washing machine, a computing device, a coffee maker, a refrigerator, a headphone, a lamp, a room sensor, a microwave, a fan, a light and any such device that is obvious to a person skilled in the art. IoT devices 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, etc.
As used herein, a “processor” or “processor” includes one or more processors, wherein processor refers to any logic circuitry for processing 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 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, 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 processor is a hardware processor.
As used herein, a “controller” or “control unit” includes one or more controllers, wherein the controller refers to any logic circuitry for processing instructions. A controller may be a general-purpose controller, a special-purpose controller, a conventional controller, a digital signal controller, a plurality of microcontrollers, one or more microcontrollers in association with a DSP core, a microcontroller, Application Specific Integrated Circuits, Field Programmable Gate Array circuits, any other type of integrated circuits, etc. The controller may perform signal coding, 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 controller or control unit is a hardware processor.
As used herein, “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 unit (“ROM”), random access memory unit (“RAM”), magnetic disk storage media, optical storage media, flash memory unit devices or other types of machine-accessible storage media.
Systems depicted in some of the figures may be provided in various configurations. In some embodiments, the systems may be configured as a distributed system where one or more components of the system are distributed across one or more networks in a cloud computing system.
The present disclosure provides a system and a method for switching a user equipment from a narrow band channel to a CAT-1/4 channel in a wireless network for delivery of emergency services, such that the system supports latching of user equipments on the high bandwidth RATs (CAT-1/4) for faster and quicker service delivery of emergency service (e.g., emergency calls). Resultantly, the high bandwidth channel will provide an efficient way of emergency

connectivity to billions of devices that have to be managed efficiently to handle emergency service requests. Once the emergency service is completed, the user equipment switches back to the narrow-band channel so as to save power.
As used herein, the "wireless network" may include, but not limited to any private or public wireless LTE network that may be presently implemented or deployed, and any wireless LTE network that may be deployed in the future. The wireless network may also be a later or newer technology of wireless LTE network, for example, LTE, LTE-A, LTE-B, LTE-C, voice over LTE etc. or any other such wireless LTE network technology obvious to a person skilled in the art. The wireless network is capable of providing one of a long-range and short-range wireless communication.
As used herein, “network entity” is an entity that serves a cellular network for providing voice services (calls) and the data services to the user equipment. The network entity may include, but not limited to, a base station controller, a base transceiver station, a cell site, a Node B, an eNodeB, a radio network controller, and any such entity obvious to a person skilled in the art.
As used herein, the “identifier” may refer to a numeric or alphanumeric string that is used for identifying the user equipment.
Referring to Fig. 1, illustrates a general architecture of the network environment [100] in which the present invention is implemented, in accordance with exemplary embodiments of the present disclosure. The environment comprises one or more user equipment ([200A], [200B], [200C]…. [200N], collectively referred to as “200”) connected to at least one wireless network entity [300].
The wireless network entity [300] further comprises a transceiver [302], a processor [306] and an interface [308]. The wireless network entity [300] may provide network access to the one or more user equipment [200] connected to the wireless network entity [300], and thereby, the one or more user equipment

[200] may avail voice and data services using said wireless network. The wireless network entity [300] is also capable of provisioning and supporting NB-IoT RAT to the user equipment [200] via one or more access points such as an IoT gateway.
The wireless network entity [300] may be one or more cellular network entities in a wireless LTE network that serves a network for providing voice services (calls) and the data services to the user equipment [200]. The wireless network entity [300] may include, but not limited to, a base station controller, a base transceiver station, a cell site, a Node B, an eNodeB, a radio network controller, etc.
The processor [306] may be configured to execute functions/operations performed by each module/component of the wireless network entity [300]. The processor [306] as used herein may include, but not limited to, a processor or set of processors such as a microprocessor, a multi-core microprocessor, a digital signal processor, a collection of electronic circuits, or a combination thereof and may be configured to perform operations /functions as described herein. The processor [306] is described in further detail below with reference to Fig. 3.
Further the transceiver [302] coupled to said processor [306] may include at least one transmission unit and at least one receiving unit and the transceiver [302] may be configured to transmit or receive the communication signals/data via the wireless network entity [300] to user equipment [200] or vice versa. The transceiver [302] is described in further detail below with reference to Fig. 3.
The interface [308] may be coupled to the transceiver [302] and processor [306] and the interface [308] may be configured for backhaul and to further reach out to an on-boarding server for information exchange. The interface [308] is described in further detail below with reference to Fig. 3.
Further the user equipment [200] may be an NB-IoT device and may include, but not limited to, a mobile phone, a tablet, a phablet, a laptop, a desktop computer, a personal digital assistant (PDA), a consumer electronics device such as meter,

television etc. and said user equipment [200] may be configured to receive at least one of a data or voice service from the wireless network entity [300]. The user equipment [200] is described in further detail below with reference to Fig. 2.
Although a limited number of user equipment [200] are shown in Fig. 1, however, it will be appreciated by those skilled in the art that the invention encompasses the use of multiple such user equipment [200].
As illustrated in Fig. 2, the present invention illustrates an exemplary block diagram of a user equipment [200], in accordance with exemplary embodiments of the present disclosure. The user equipment [200] comprises at least one application module [202], at least one transceiver [204], at least one memory unit [206] and at least one processor [208]. The user equipment [200] may further comprise of at least one antenna [212] and at least one on-boarding client module [210]. All the above said components of the user equipment [200] are connected to each other.
The memory unit [206] is coupled to transceiver [204], the application module [202], the on-boarding client module [210] and the processor [208]. The memory unit [206] is configured to store, in a database, a list of legacy CAT-1/4 channel. The memory unit [206] is also configured to receive from the transceiver [204], and store the list of CAT-1/4 channels received from the network entity [300] at the user equipment [200] in a database. The memory unit [206] is also be configured to store the acknowledgement signal received from the wireless network corresponding to the emergency service received from the user equipment [200].
The processor [208] of the user equipment [200] is coupled to the transceiver [204], the application module [202], the on-boarding client module [210] and the memory unit [206]. The processor [208] is configured to identify a category of service for the service request generated at the user equipment [200]. The

service request may comprise an establishment cause. As used herein, “establishment cause” may be understood as an indication of the nature of service requested by a user equipment. For example, the establishment cause may be one of, but not limited to, a type of service, a priority of service, a service identifier, etc. The service request may further comprise of a user equipment identifier.
In an instance, the processor [208] may identify a category of service for the service request based on at least the establishment cause of the said service request. For example, when a service request is triggered for emergency bearer services, the RRC establishment cause may be set to Emergency call, and accordingly, the processor [208] may then identify the service request as an emergency service, and treats the emergency service request with the highest priority.
The processor [208] may further be configured to generate a service request at the user equipment [200]. For example, if a user wishes to make an emergency call and presses any key on the user equipment [200] to make the emergency call, an emergency call request is generated at the user equipment [200].
The processor [204] is further configured to switch the user equipment [200] from the narrow band channel to a CAT-1/4 channel based at least on the identified category of the service request being an emergency service. In this regard, the processor may further be configured to receive an identified at least one available CAT-1/4 channel from the application module [202], said identified at least one available CAT-1/4 channel being identified by the application module [202] from a stored list of legacy CAT-1/4 channel. Accordingly, the processor [204] is further configured to switch the user equipment [200] from the narrow band channel to the identified at least one available CAT-1/4 channel.
In another instance, in an event the application module [202] fails to identify at least one available CAT-1/4 channel from the list of legacy CAT-1/4 channel

stored in the memory unit [206], the application module [202] performs a full band scan to search for at least one available CAT-1/4 channel via the transceiver [204]. Accordingly, the processor [204] is further configured to switch the user equipment [200] from the narrow band channel to the at least one available CAT-1/4 channel searched during the full band scan search by the application module [202].
Further, upon receiving an indication of a completion of the service request from the network entity [300] at the application module [202], the processor [208] is further configured to switch from the CAT-1/4 channel to the narrow band channel in response to said indication received from the network entity [300]. The processor [208] is configured to execute the functions of all modules present in the user equipment [200].
The application module [202] is coupled to said antenna [212], the transceiver [204], the memory unit [206], the on-boarding client module [210] and the processor [208]. The application module [202] is configured to transmit a service request to the wireless network entity [300] of the wireless network via the transceiver [204]. The service request comprises at least an establishment cause. The service request may further comprise of a user equipment identifier and a request for emergency service (e.g., request for an emergency call, etc.). The application module [202] is further configured to transmit the service request to the processor [208].
The application module [202] is further configured to perform a scan of stored list of legacy CAT-1/4 channels in the memory unit [206] to identify at least one available CAT-1/4 channel from said list of legacy CAT-1/4 channel. For example, the application module periodically requests the network entity [300] to share a list of CAT-1/4 channels. Upon receiving said list of CAT-1/4 channels from the network entity [300] via the transceiver [204], the application module [202] transmits the list for storage at the memory unit [206]. The list may comprise at

least one available CAT-1/4 channel information and a channel identifier associated with each of the at least one available CAT-1/4 channel.
Further, in an event the application module [202] fails to identify at least one available CAT-1/4 channel from the list of legacy CAT-1/4 channel stored in the memory unit [206], the application module [202] is further configured to perform a full band scan to search for at least one available CAT-1/4 channel via the transceiver [204]. The application module [202] is further configured to receive, from the network entity [300], an indication of completion of the service request at the user equipment [200], in response to which the processor [208] switches from the CAT-1/4 channel to the narrow band channel. The application module [202] may be configured to implement IoT functionality in the user equipment [200] in combination with multiple hardware and software components.
The transceiver [204] of the user equipment [200] is coupled to said antenna [212], the memory unit [206], the application module [202], the on-boarding client module [210] and the processor [208]. The transceiver [204] is to be configured to transmit the service request to the network entity [300] via the antenna [212]. The transceiver [204] is also be configured to transmit an emergency service request via the narrow band channel to the network entity [300].
The transceiver [204] is also configured to receive a list of CAT-1/4 channels from the network entity [300] at the user equipment [200]. The list may comprise at least one available CAT-1/4 channel information and a channel identifier associated with each of the at least one available CAT-1/4 channel. The transceiver [204] is also configured to share the said list with the application module [202] and the memory unit [206]. The transceiver [204] is also configured to receive an indication from the wireless network corresponding to a completion of the service request to the user equipment [200].

The transceiver [204] is also configured to perform a periodic cell search to identify at least one legacy CAT-1/4 channels. Further, the transceiver [204] is also configured to perform a full band scan to identify at least one legacy CAT-1/4 channel. Further, the transceiver [204] is also configured to communicate with the processor [208] to execute the desired functions.
The on-boarding client module [210] is coupled to said antenna [212], the transceiver [204], the application module [202], the processor [208] and the memory unit [206]. The on-boarding client module [210] may be configured to communicate to an on-boarding server via the transceiver [204] while being in charge of the device-specific on-boarding function.
Fig.3 illustrates an exemplary diagram of the network entity [300], in accordance with exemplary embodiments of the present disclosure. As shown in Fig. 3, the wireless network entity [300] comprises at least one transceiver [302], at least one memory unit [304], at least one processor [306], at least one antenna [310] and at least one interface [308].
The transceiver [302] is coupled to the antenna [310], and the transceiver [302] is configured to transmit or receive the radio signals via said antenna [310]. Further said transceiver [302] may include at least one transmission unit and at least one receiving unit (not shown in the figure) and the transceiver [302] may be configured to transmit or receive the communication signals/data via wireless network entity [300] to user equipment [200] or vice versa.
For instance, the transceiver [302] of wireless network entity [300] may be configured to receive a service request comprising at least an establishment cause. For another instance, the transceiver [302] of wireless network entity [300] may be configured to receive an indication of switching, by the user equipment [200], from the narrow band channel to a CAT-1/4 channel based at least on the identified category of the service request being an emergency service. In another instance, the transceiver [302] of wireless network entity

[300] may be configured to transmit an indication of completion of the emergency service request to the user equipment [200].
The processor [306] is connected to the memory unit [304], the transceiver [302] and the interface [308]. The processor [306] may be configured to execute functions/operations performed by each module/component of the wireless network entity [300]. The processor [306] as used herein may include, but not limited to, a processor or set of processors such as a microprocessor, a multi-core microprocessor, a digital signal processor, a collection of electronic circuits, or a combination thereof and may be configured to perform operations /functions as described herein.
The processor [306] is further configured to process the service request received from the user equipment [200], for instance, a service request for emergency calling. The service request comprising at least an establishment cause and a user equipment [200] identifier. The processor [306] is further configured to determine a completion of said service request. For example, in an event the emergency service request corresponds to an emergency calling service, the processor [306] determines that the emergency call service has been completed. The processor [306] is further configured to transmit an indication of said completion of the service request to the user equipment [200].
Further, the memory unit [304] is configured to store information related to at least one CAT-1/4 channel in a wireless network, wherein the information may include but not limited to at least one of a channel identifier associated with each of the at least one available CAT-1/4 channel, a channel measurement and channel frequency in a wireless network.
The interface [308] may be coupled to the transceiver [302] and processor [306] and the interface [308] may be configured for backhaul and to further reach out to an on-boarding server for information exchange.

Referring to Fig. 4, an exemplary method flow diagram [400] depicting a method for switching a user equipment [200] from a narrow band channel to a CAT-1/4 channel in a wireless network for an emergency service, in accordance with exemplary embodiments of the present disclosure. The user equipment [200] may currently be connected to the network entity [300] over the NB-IoT channel.
The method begins at step [402]. The method begins when the user equipment [200] requests for a service, such as an emergency service like an emergency calling. At step [404], the user equipment [200] identifies a category of service for a service request generated at the user equipment [200]. The service request may comprise an establishment cause. As used herein, “establishment cause” may be understood as an indication of the nature of service requested by a user equipment. For instance, the establishment cause may be one of, but not limited to, a type of service, a priority of service, a service identifier, etc. The service request may further comprise of a user equipment identifier.
In an instance, the user equipment [200] may identify a category of service for the service request to be transmitted to the network entity [300] based on at least the establishment cause of the said service request. For instance, when a service request is triggered for emergency bearer services, the RRC establishment cause may be set to Emergency call. This may further allow the network entity [300] to understand the nature of the service and allocate the resources to user equipment [200] on priority. Thus, for instance, if the service request pertains to emergency calling, the user equipment [200] identifies the service request as an emergency service request. The user equipment treats the emergency service request with the highest priority.
In another instance, the method may further involve generating the service request at the user equipment [200]. For example, if a user wishes to make an emergency call and presses any key on the user equipment [200] to make the emergency call, an emergency call request is generated at the user equipment [200].

In yet another instance, the method may further involve a mechanism of transmitting and availing emergency services by the user equipment [200]. The method may comprise receiving a signal at the user equipment [200] from a network entity [300] indicating whether the wireless network supports emergency services. For instance, the network entity [300] transmits a system information broadcast (SIB) to the user equipment [200] to indicate whether the IMS emergency call is supported by the wireless network. When the user equipment [200] is switched ON, the user equipment [200] transmits a RRC request to the network entity [300], for example, the RRC connection request may comprise a PRACH Preamble. In response, the network entity [300] transmits response RRC message to the user equipment [200], for example, the RRC connection request may comprise a RACH Response.
Further, the user equipment [200] transmits a RRC connection request to the network entity [300] along with an establishment cause, for example, for an emergency service the establishment cause is emergency. In response, the network entity [300] transmits response RRC connection setup to the user equipment [200]. The user equipment [200] installs the setup, and establishes a connection with the network entity [300]. Subsequently, the user equipment [200] uplinks data request to, and downlinks information from, the network entity [300]. For example, the user equipment [200] transmits a RRC connection setup complete message to the network entity [300] along with an attach request and and a PDN connection request. The attach request may comprise request type, for example, the request type is an emergency. In response, the network entity [300] transmits RRC message along with the DL Information and security mode command to the user equipment [200].
The, the user equipment [200] transmits RRC message along with the UL Information Transfer and a security mode complete command to the network entity [300]. In response, the network entity [300] transmits RRC message to the user equipment [200] indicating that the implementation of the security mode

command. Thereafter, the user equipment [200] transmits RRC message to the network entity [300] indicating that the security mode is complete, followed by the network entity [300] enquiring the user equipment [200] for its capabilities via a RRC message. In response, the user equipment [200] transmits its capabilities via another RRC message to the network entity [300].
Afterwards, the network entity [300] transmits a RRC connection reconfiguration message to the user equipment [200] along with an attach request and EPS message to activate default EPS bearer context request. In response, the network entity [300] transmits a RRC connection reconfiguration complete message to the user equipment [200] along with an attach complete message and NAS message to activate default EPS bearer context accept. The network entity [300] then transmits the EMM-information to the user equipment [200].
Further, the user equipment [200] transmits a SIP-invite to the network entity [300] to connect an emergency call with a second user equipment. The network entity [300] transmits the ringing at the said second user equipment to the user equipment [200]. Once the call is connected with the second user equipment, the network entity [300] then transmits the message from the second user equipment to the user equipment [200]. For example, if the message from the second user equipment is 200 OK, the network entity [300] transmits 200 OK to the user equipment [200], and sends an acknowledgment thereof. Alternatively, if the message from the second user equipment is BYE, the network entity [300] transmits BYE to the user equipment [200], and the call is disconnected.
Subsequently, at step [406], the user equipment [200] switches from the narrow band channel to a CAT-1/4 channel based at least on the identified category of the service request being an emergency service. The switching of the user equipment [200] from the narrow-band channel to the CAT 1/4 channel includes identifying by the user equipment [200] an optimum channel from the list of available channels received from the network entity [300].

In an instance, the user equipment [200] identifies at least one available CAT-1/4 channel from a stored list of legacy CAT-1/4 channel, said list being stored in a database in the memory unit [206] of the user equipment [200]. The stored list may include those CAT-1/4 channels to which the user equipment [200] may have previously latched onto due to any service-based trigger, such as Firmware Over the Air (FOTA) upgrade. Accordingly, the user equipment [200] switches from the narrow band channel to the identified at least one available CAT-1/4 channel.
In another instance, in an event the user equipment [200] fails to identify at least one available CAT-1/4 channel from the list of legacy CAT-1/4 channel stored in the memory unit [206], or there is no stored list available in the memory unit [206], the user equipment [200] performs a full band scan to search for at least one available CAT-1/4 channel via the transceiver [204]. In such a case, the user equipment [200] may change the mode setting to ‘CAT-1 preferred’ or ‘CAT-1 only’ and then perform the full band scan. Accordingly, the user equipment [200] then switches from the narrow band channel to the at least one available CAT-1/4 channel found during the full band scan search by the user equipment [200] and avails the emergency service via the available CAT-1/4 channel.
Thereafter, at step [408], the user equipment [200] finally transmits the service request to a network entity [300] of the wireless network, wherein the said service request comprises an establishment cause for availing the emergency service. In an instance, in response to receiving the said service request from the user equipment [200], the network entity [300] may transmit an acknowledgement signal corresponding to the said service request to the user equipment [200]. Thereafter, the method ends at step [410].
The method may further comprise the network entity [300] determining the completion of said service request. For example, in an event the emergency service request corresponds to an emergency calling service, the network entity [300] determines that the emergency call service has been completed. The

network entity [300] then transmits an indication of said completion of the service request to the user equipment [200]. For example, in an ongoing emergency call, only after the call is hung up by the user, there will be a signalling message exchanged and acknowledged between the user equipment [200] and the network entity [300] indicating that the emergency call session is complete.
The method may further comprises receiving said indication of the completion of services from the network entity [300] at the user equipment [200]. Accordingly, the method further comprises that the user equipment [200] switches from the CAT-1/4 channel to the narrow band channel in response to the indication of the completion of the service request so received from the network entity. Thus, once the emergency service is completed, the user equipment [200] switches back to the NB-IoT channel to save the power of the device and to avail other benefits of the NB-IoT network.
The method may further involve the user equipment [200] periodically transmitting a request for legacy CAT-1/4 cell to the network entity [300]. The method may further comprise the network entity [300] transmitting a list of CAT-1/4 channels to the user equipment [200]. The list comprises at least one available CAT-1/4 channel information and a channel identifier associated with each of the at least one available CAT-1/4 channel. The method may further comprise storing by the user equipment [200] list of CAT-1/4 channels in a database.
Referring to Fig. 5, an exemplary flow diagram [500] depicting an exemplary method for implementation of emergency call trigger in the legacy network, in accordance with exemplary embodiments of the present disclosure.
The exemplary method relates to a mechanism for supporting switching from NB-IoT to CAT-1 cell through stored CAT-1 list of cells or by changing the mode of operation to CAT-1 preference mode, and thereafter, the user equipment [200]

camps on a cell for emergency service. The stored CAT-1 list of cells may exist at the user equipment [200] due to any previously executed service-based trigger with the network entity [300], for example, a previously performed FOTA upgrade.
The example encompasses that the method begins at step [502]. The user equipment [200] may currently be camped to the wireless network entity [300] over the NB-IoT channel, as shown in step [504]. At step [506], the user equipment [200] determines whether an emergency service, i.e., an emergency call is to be initiated. If yes, the method proceeds to step [508] else back to step [504].
Since, the emergency service-based request is of the highest priority, the user equipment [200], at step [508], checks for availability of stored CAT-1 list. In an event, the user equipment [200] finds a stored list of legacy CAT-1/4 cell in the memory unit [206], the user equipment [200], the method proceeds to at step [510], and performs a scan of the list of legacy CAT-1/4 channel stored in the memory unit [206] to identify at least one available CAT-1/4 channel from said list of legacy CAT-1/4 channel, in order to camp quickly on an available CAT-1 cell.
Subsequently, in an event the user equipment [200] identifies that at least one CAT-1/4 channel is available from the list of legacy CAT-1/4 channel stored in the memory unit [206], it proceeds to step [512], and camps to the identified available CAT-1/4 channel, and lastly, at step [518], successfully initiates an emergency call.
However, in an event the list of CAT-1 channels is not available on the user equipment [200] or in an event the list is available but the user equipment [200] fails to identify at least one CAT-1/4 channel that is available from the list of legacy CAT-1/4 channel stored in the memory unit [206], the user equipment [200], at step [514], changes the operational mode of the user equipment [200]

from NB-IoT to CAT-1 preferred or CAT-1 only. In operation, the user equipment [200] performs a full band scan to search for at least one available CAT-1/4 channel. Upon successfully finding an available CAT-1/4 channel, at step [516], the user equipment camps to the said found available CAT-1/4 channel, and lastly, at step [518], successfully initiates an emergency call.
Further, the method may comprise that upon completion of the emergency call, the user equipment [200] receives an indication of the completion of the emergency call from the network entity [300], and then the user equipment [200] performs re-selection of operational mode, and switches from the connected CAT-1/4 channel to the NB-IoT upon the completion of the emergency service.
Therefore, as is evident from the above method, the user equipment [200] can easily switch from CAT-NB to CAT 1/4 channel when an emergency service request is to be executed. Since the list of available CAT 1/4 channels are already stored at the user equipment [200], it avoids unnecessary signalling between the user equipment [200] and the network entity [300] and quickly camps the user equipment [200] onto the network entity [300] for delivery of emergency services.
Therefore, as is evident from the above disclosure, the present invention provides mechanisms to switch a user equipment [200] from a CAT-NB channel to a CAT 1/4 channel whenever there is a request for emergency services. For instance, when an emergency call needs to be placed, it is more efficient for the user equipment [200] to switch from CAT-NB to CAT 1/4 channel so as to avail a higher bandwidth and better speed. Similarly, for instance, if the user equipment [200] is an emergency push-button in a cab, and the user lands in an unwelcoming situation, mishap like an accident, the user may press the push¬button to avail emergency calling. In such a case, the present invention facilitates the user to place an emergency call by switch from CAT-NB channel to a CAT 1/4 channel so as to efficiently make the emergency call to the network.

Although the above description has been described for switching between CAT NB-IoT channel to CAT-1 channel, it will be appreciated by those skilled in the art that the techniques described herein can be used for providing switching of a user equipment [200] from a CAT-NB channel to a CAT-1, or CAT-4 channel.
The interface, module, memory, database, processor and component depicted in the figures and described herein may be present in the form of a hardware, a software and a combination thereof. The connection shown between these components/module/interface in the system [100] are exemplary, and any components/module/interface in the system [100] may interact with each other through various logical links and/or physical links. Further, the components/module/interface may be connected in other possible ways.
Though a limited number of servers, gateways, user equipment, wireless network, interface, module, memory, database, processor and component have been shown in the figures, however, it will be appreciated by those skilled in the art that the overall system of the present invention encompasses any number and varied types of the entities/elements such as servers, gateways, user equipment, wireless network, interface, module, memory, database, processor and component.
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 invention. These and other changes in the embodiments of the present invention 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.

We Claim
1. A method of switching a user equipment [200] from a narrow-band channel
to a Category- 1/4 (CAT-1/4) channel in a wireless network for an emergency
service request, said user equipment [102] being currently connected to said
narrow-band channel, the method comprising:
- identifying, at the user equipment [200], a category of service for a service request generated at the user equipment [200] ;
- switching, by the user equipment [200], from the narrow band channel to a CAT-1/4 channel based at least on the identified category of the service request being an emergency service; and
- transmitting to a network entity [300] of the wireless network, by the user equipment [200], the service request comprising an establishment cause for availing the emergency service.
2. The method as claimed in claim 1, further comprising:
scanning, by the user equipment [200], a list of legacy CAT-1/4 channel stored in a database at the user equipment [200] to identify at least one available CAT-1/4 channel from said list of legacy CAT-1/4 channel; and
in an event the user equipment [200] fails to identify at least one available CAT-1/4 channel from the list of legacy CAT-1/4 channel stored in the database at the user equipment [200], the method further comprising performing a full band scan to search for at least one available CAT-1/4 channel.
3. The method as claimed in claim 2, further comprising switching, by the user equipment [200], from the narrow band channel to the identified at least one available CAT-1/4 channel.
4. The method as claimed in claim 1, the method further comprising

determining, by the network entity [300], a completion of said service request;
transmitting, by the network entity [300], an indication of said completion of the service request to the user equipment [200]; and
switching, by the user equipment [200], from the CAT-1/4 channel to the narrow-band channel in response to the indication received from the network entity.
5. The method as claimed in claim 1 wherein said service request is an emergency request or an emergency call.
6. A user equipment [200] connected to a wireless network, said user equipment [200] comprising:

- a memory unit [206];
- a processor [208] connected to the memory unit [206], said processor [208] configured to:
identify a category of service for a service request generated at the user equipment [200]; and
switch the user equipment [200] from the narrow band channel to a CAT-1/4 channel based at least on the identified category of the service request being an emergency service.
- an application module [202] connected to the memory unit [206] and
the processor [208], said application module [202] configured to
transmit the service request to a network entity [300] of the wireless
network via a transceiver [204], said service request comprising an
establishment cause for availing the emergency service.
7. The user equipment [200] as claimed in claim 7, wherein the memory unit
[206] is configured to store, in a database, a list of legacy CAT-1/4 channel.

8. The user equipment [200] as claimed in claim 8, wherein the application
module [202] is further configured to:
scan the list of legacy CAT-1/4 channel stored in the memory unit [206] to identify at least one available CAT-1/4 channel from said list of legacy CAT-1/4 channel; and
in an event the application module [202] fails to identify at least one available CAT-1/4 channel from the list of legacy CAT-1/4 channel stored in the memory unit [206], the application module [202] is further configured to perform a full band scan to search for at least one available CAT-1/4 channel via the transceiver [204].
9. The user equipment [200] as claimed in claim 8, wherein the processor [208]
is further configured to switch from the narrow band channel to the
identified at least one available CAT-1/4 channel.