DESC:FIELD OF THE INVENTION
[0001] The present disclosure, in general, relates to network procedures performed by User Equipment (UE), and, in particular, relates to network procedures performed by a UE for managing a Voice over New Radio (VoNR) call.
BACKGROUND
[0002] In Initial deployment, 5G NR network does not provide voice/video communication services. When the gNB establishes an IMS voice/video communication channel on the NR network, a handover is triggered. In this case, the gNB sends a redirection or inter-RAT handover request to the 5GC to fall back to the LTE network and use the VoLTE service
[0003] In VoNR, UEs camp on the NR network, and voice/video communication and data services are carried on the NR network. When a UE moves to the area where the NR signal coverage is poor, a coverage-based handover needs to be initiated to implement the interworking with the 4G network.
[0004] Difference between VoNR with EPS fallback & handover in an ongoing VoNR call:
[0005] EPS Fallback is a feature for devices which do not support VoNR. In this, a 5G device connected to 5G and 4G wants to initiate a call. As it does not support NR, the 5G cell initiates signalling to initiate the call and re-directs the call to 4G cell. So, the audio channel is created on 4G from the start of the call in EPS Fallback. Whereas in Handover in VoNR, a device is connected to 5G and 4G cell and a VoNR call is ongoing. The device detects a degradation in 5G signal and then the UE looks for other cells which have better signal. Then the UE sends a measurement report if it finds a better cell. The 5G cell then hands over the call to the better 4G reported in the measurement report. This process would include a time period wherein the call quality is bad while the handover is completed. This problem statement has been identified wherein EPS Fallback feature, which is for devices not supporting VoNR, can be used by VoNR supporting devices for better call connectivity.
[0006] UE can make VoNR calls when the UE is connected to 5GC thorough NG-RAN and IMS voice over PS session over NR supported. When the device is in NR weak signal area where not only NR serving cell but also all neighboring NR cells are below a certain threshold, VoNR call is not a good option for voice services as there will be an impact on voice quality due to NR signal quality deterioration. However, when the device is in NR weak signal area where all NR cells are below a certain threshold, NR cell reselections not possible but LTE signal is above desired threshold, EPS Fall-back is a good option for voice services, provided the device is in LTE & NR overlapping area. User can not disable VoNR capability to use VoLTE services for better voice quality in weak NR signal area. N1 mode capability (5G) is disabled in 5G device if IMS voice is not available in “voice centric” device. As per 3GPP TS 24.501, Section 4.3.2 (Domain selection for UE originating sessions / calls), UE shall disable the N1 mode capability for 3GPP access when IMS voice is not available over 3GPP access, if the UE's usage setting is "voice centric", the UE operates in single-registration mode. User can only disable N1 mode (5G) capability to use VoLTE services in weak NR signal area. However, the user 5G data services are impacted as 5G capability is disabled.
[0007] Thus, there is a need for a solution that overcomes the above deficiencies.
SUMMARY
[0008] This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the invention and nor is it intended for determining the scope of the invention.
[0009] The present subject matter refers a method for managing a Voice over New Radio (VoNR) call in a 5G User Equipment (UE). The method includes detecting, by the UE, an initiation of the VoNR call over a 5G cell. The method includes detecting, by the UE, a signal strength associated with the 5G cell is below a threshold value of the signal strength associated with the 5G cell and a signal strength associated with a 4G cell is above another threshold value of the signal strength associated with the 4G cell. The method includes initiating, by the UE, an Evolved Packet System (EPS) fallback process to establish the VoNR call over the 4G cell as a Voice over Long Term Evolution (VoLTE) call.
[0010] The present subject matter refers a method implemented in a User Equipment (UE) for managing a Voice over New Radio (VoNR) call. The method includes determining, by the UE, a signal strength of a plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE). The method includes disabling, by the UE, a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE upon determining the signal strength associated with at least one cell serving the 4G LTE is greater than a threshold value of the signal strength serving the 4G LTE and the signal strength associated with at least one cell serving the 5G NR is less than a threshold value of the signal strength serving the 5G NR. The method includes transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”. The method includes triggering, by the UE, an EPS fallback to establish the VoNR call over the 4G LTE.
[0011] The present subject matter refers to a system for managing a Voice over New Radio (VoNR) call in a 5G User Equipment (UE). The system includes detecting, by a controller, an initiation of the VoNR call over a 5G cell. The system includes detecting, by the controller, a signal strength associated with the 5G cell is below a threshold value of the signal strength associated with the 5G cell and a signal strength associated with a 4G cell is above another threshold value of the signal strength associated with the 4G cell. The system includes initiating, by the controller, an Evolved Packet System (EPS) fallback process to establish the VoNR call over the 4G cell as a VoLTE call.
[0012] The present subject matter refers a system implemented in a User Equipment (UE) for managing a Voice over New Radio (VoNR) call. The system includes determining, by a controller, a signal strength of a plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE). The system includes disabling, by the controller, a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE upon determining the signal strength associated with at least one cell serving the 4G LTE is greater than a threshold value of the signal strength serving the 4G LTE and the signal strength associated with at least one cell serving the 5G NR is less than a threshold value of the signal strength serving the 5G NR. The system includes transmitting, by a communication unit, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”. The system includes triggering, by the controller, an EPS fallback to establish the VoNR call over the 4G LTE.
[0013] To further clarify advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS
[0014] These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
[0015] Fig. 1 illustrates a method for managing a Voice over New Radio (VoNR) call in a 5G User Equipment (UE), in accordance with an embodiment of the present subject matter;
[0016] Fig. 2 illustrates a method implemented in a UE for managing a Voice over New Radio (VoNR) call, in accordance with an embodiment of the present subject matter;
[0017] Fig. 3 illustrates an operational flow diagram depicting a process for managing the VoNR established in an area with a weak signal strength, in accordance with an embodiment of the present subject matter;
[0018] Fig. 4 illustrates an operational flow diagram depicting a process for managing a VoNR call established in a 4G LTE and 5G NR overlapping area, in accordance with an embodiment of the present subject matter;
[0019] Fig. 5 illustrates an operational flow diagram depicting a process for managing a VoNR call established in an area with a moderate signal strength, in accordance with an embodiment of the present subject matter;
[0020] Fig. 6 illustrates an operational flow diagram depicting a process for managing a VoNR call by a user, in accordance with an embodiment of the present subject matter;
[0021] Fig. 7 illustrates a schematic block diagram depicting a method implemented in a UE for managing a VoNR call, in accordance with an embodiment of the present subject matter; and
[0022] FIG. 8 is a diagram illustrating the configuration of a terminal in a wireless communication system according to an embodiment of the present subject matter.
[0023] Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have been necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present invention. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

DETAILED DESCRIPTION OF FIGURES
[0024] For promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
[0025] It will be understood by those skilled in the art that the foregoing general description and the following detailed description are explanatory of the invention and are not intended to be restrictive thereof.
[0026] Reference throughout this specification to “an aspect”, “another aspect” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrase “in an embodiment”, “in another embodiment” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.
[0027] The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but may include other steps not expressly listed or inherent to such process or method. Similarly, one or more devices or sub-systems or elements or structures or components proceeded by "comprises.. a" does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skilled in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.
[0029] Fig. 1 illustrates a schematic block diagram 100 depicting a method for managing a Voice over New Radio (VoNR) call in a 5G User Equipment (UE), in accordance with an embodiment of the present subject matter. In one embodiment, the method may be performed by the UE. In one embodiment, the UE may be configured to initiate the VoNR call. In an embodiment, the UE may be configured to connect with at least one cell associated with 5G New Radio (NR) and 4G Long Term Evolution (LTE). In one embodiment, the at least one cell serving the 4G LTE may interchangeably be referred as a 4G cell. Furthermore, in one embodiment the at least one cell serving the 5G NR may interchangeably be referred as a 5G cell. In one embodiment, the method may be based on an intelligent use of Evolved Packed System (EPS) fall back for the UE leading to a better call connectivity. In an embodiment, the EPS fall back may include establishing the VoNR call over 4G Long Term Evolution (LTE) upon determining that the VoNR call is unable to be established over the 5G NR.
[0030] In one embodiment, the method may include detecting (step 102) an initiation of the VoNR call over the 5G cell. In an embodiment, the 5G cell may be the at least one cell associated with the 5G NR.
[0031] Moving forward, the method may include detecting (step 104) a signal strength associated with the 5G cell is below a threshold value of the signal strength associated with the 5G cell. In continuation with the above embodiment, the method may include detecting a signal strength associated with the 4G cell is above another threshold value of the signal strength associated with the 4G cell. Moving forward, the method may include disabling, a VoNR capability associated with the UE for a pre-determined amount of time. In one embodiment, the VoNR capability may be disabled by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE. In an embodiment, the VoNR capability may be disabled upon determining that the signal strength associated with the 4G cell is greater than a threshold value of the signal strength serving the 4G LTE and the signal strength associated with the 5G cell is less than a threshold value of the signal strength serving the 5G NR.
[0032] Continuing with the above embodiment, the method may include initiating (step 106) an EPS fallback process to establish the VoNR call over the 4G cell as a Voice over Long Term Evolution (VoLTE) call. In one embodiment, the EPS fallback process may be initiated following a transmission of a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed” from the UE. In one embodiment, the transmission may initiate in response to the disabling of the VoNR capability. In an embodiment, the
[0033] In one embodiment, triggering the EPS fallback to establish the VoNR call over the 4G LTE may be based on a number of parameters comprising a Block error rate (BLER), a Reference Signal Received Power (RSRP) and a number of retransmissions, one or more of signals associated with the plurality of cells serving the 5G NR and the 4G LTE, a battery power associated with the UE, a transmission power to connect with the 4G LTE and the 5G NR associated with the UE, a handover, a call drop rate, a call failure rate, a call packet drop rate, a jitter, and one or more audio quality parameters.
[0034] In an embodiment, the EPS fallback may be triggered in response to determining that the BLER is above a threshold value in the 5G NR. In one embodiment, the EPS fallback may be triggered in response to determining that the RSRP is below a threshold value in the 5G NR and above a threshold value in the 4G LTE. Further, in one embodiment, the EPS fallback may be triggered in response to determining that the number of packet re-transmissions is above a threshold value associated with the number of packet re-transmissions. Moving forward, the EPS fallback may be triggered based on the signal strength related to the one or more signals associated with the plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE). In an embodiment, the plurality of cells may include the 5G cell and the 4G cell.
[0035] Furthermore, in one embodiment, the EPS fallback may be triggered in response to determining that the battery power associated with the UE is less than a threshold value associated with the battery power. In one embodiment, the EPS fallback may be triggered in response to determining that a difference between the transmission power required to connect with the 4G LTE and the 5G NR is greater than a threshold value. In one embodiment, the EPS fallback may be triggered in response to determining that the call pack drop rate in the 5G NR is above a threshold value associated with the call pack drop rate. In one embodiment, the EPS fallback may be triggered in response to determining that the jitter in the 5G NR is above a threshold value associated with the jitter.
[0036] Furthermore, the EPS fallback may be triggered based on the one or more audio quality parameters indicating that an audio quality is not suitable for the 5G NR. In one embodiment, the EPS fallback may be triggered in response to determining that the occurrence of the call drops and the call set up failures in the 5G NR is above a threshold value associated with the call drop and the call set up failures. In one embodiment, the EPS fallback may be triggered in response to determining that the occurrence of the handover in the 5G NR is above a threshold value associated with the handover.
[0037] Fig. 2 illustrates an operational flow diagram 200 depicting a process implemented in a UE for managing a VoNR call, in accordance with an embodiment of the present subject matter. In an embodiment, the UE may be configured to establish the VoNR call when the UE may be connected to a 5G NR through NG-RAN and IMS voice over PS session. In an embodiment, managing the VoNR call may be based on an EPS fallback to establish the VoNR call over a 4G LTE. In an embodiment, the EPS fallback may be initiated in response to determining that the VoNR call cannot be established over the 5G NR.
[0038] In accordance with an embodiment of the present subject matter, the process may include determining (step 202) a signal strength of a plurality of cells serving 5G NR and the 4G LTE. In an embodiment, the plurality of cells may include at least on cell serving the 4G LTE and at least one cell serving the 5G NR. In one embodiment, the at least one cell serving the 4G LTE may interchangeably be referred as a 4G cell. Furthermore, in one embodiment the at least one cell serving the 5G NR may interchangeably be referred as a 5G cell. In one embodiment, the signal strength may be determined by reading a neighbour cell list from system information for the 5G NR and 4G LTE. In one embodiment, the method may include parallelly monitoring whether an occurrence of one or more call drops, one or more call failures is due to poor signal quality or not. In one embodiment, the poor signal quality may correspond to a signal strength associated with the 5G cell being used for establishing the VoNR call. In response to detecting the occurrence of one or more of the one or more call drops, and the one or more call failures due to the poos signal quality, the method may proceed towards step 204.
[0039] Moving forward, the process may include determining (step 204) whether the signal strength of the 4G cell is greater than a threshold value of the signal strength serving the 4G LTE and the signal strength of the 5G cell is less than a threshold value of the signal strength serving the 5G NR or not. In one embodiment, the process may terminate upon determining that the signal strength of the 4G cell is not greater than the threshold value of the signal strength and the signal strength of the 5G cell is not less than the threshold value of the signal strength.
[0040] In an embodiment, where it is determined that the signal strength of the 4G cell is greater than the threshold value of the signal strength and the signal strength of the 5G cell is less than the threshold value of the signal strength, the process may proceed towards step 206.
[0041] Continuing with the above embodiment, the process may proceed towards disabling (step 206) a VoNR capability associated with the UE for a pre-determined amount of time. In one embodiment, the VoNR capability may be disabled by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE.
[0042] Furthermore, the process may include, transmitting (208) a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0043] Continuing with the above embodiment, the process may proceed towards triggering (step 210) the EPS fall back to establish the VoNR call over the 4G LTE.
[0044] In one embodiment, the process may further include determining (step 212) the signal strength associated with the 5G cell connected to the UE after the pre-determined amount of time.
[0045] In continuation with the above embodiment, the process may proceed towards enabling (step 214-a) the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength. Further, in an embodiment, the process may include initiating (step 214-b) a timer for the pre-determined amount of time for determining the signal strength associated with the 5G cell upon determining that the signal strength associated with the 5G cell is less the threshold value of the signal strength.
[0046] Fig. 3 illustrates an operational flow diagram 300 depicting a process for managing the VoNR established in an area with a weak signal strength, in accordance with an embodiment of the present subject matter. In an embodiment, managing the VoNR call may based on a first transmission power and a second transmission power required by the UE.
[0047] In one embodiment, the process may include, determining (step 302) the first transmission power required for the UE. In one embodiment, the first transmission power may be required by the UE to connect with the 5G cell to establish the VoNR call.
[0048] Continuing with the above embodiment, the process may include determining (step 304) the second transmission power required for the UE. In one embodiment, the second transmission power may be required by the UE to connect with the 4G cell to establish the VoNR call using an EPS fallback.
[0049] Moving forward, the process includes, determining (step 306) whether the first transmission power is greater than the second transmission power by a pre-determined threshold. In one embodiment, where it is determined that the first transmission power is not greater than the second transmission power by the pre-determined threshold, the process may proceed to step 308.
[0050] Continuing with the above embodiment, the process may include keeping (step 308) the VoNR enabled for the UE.
[0051] In one embodiment, where it is determined that the first transmission power is greater than the second transmission power by the pre-determined threshold, the process may proceed towards step 310.
[0052] Continuing with the above embodiment, the process may include determining (step 310) whether a battery level related to the UE is greater than a battery threshold or not. In an embodiment, where it is determined that the battery level is greater than the battery threshold, the process may backtrack to the step 308. Further, in an embodiment, where it is determined that the battery level is less than the battery threshold, the process may proceed towards step 312.
[0053] In an embodiment, the process may include proceeding towards step 312 upon determining that the first transmission power is greater than the second transmission power by the pre-determined threshold, the process may proceed towards step 310.
[0054] In continuation with the above embodiment, the process may proceed towards disabling (step 312) a VoNR capability associated with the UE for a pre-determined amount of time. In an embodiment, the VoNR capability may be disabled upon determining that the battery level is less than the battery threshold. In an embodiment, the VoNR capability may be disabled by setting a RRC "VoiceOverNR" capability bit to FALSE.
[0055] Furthermore, the process may include, transmitting (step 314) a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0056] Continuing with the above embodiment, the process may proceed towards triggering (step 316) the EPS fall back to establish the VoNR call over the 4G LTE.
[0057] In one embodiment, the process may further include determining (step 318) the signal strength associated with the 5G cell connected to the UE after the pre-determined amount of time.
[0058] In continuation with the above embodiment, the process may proceed towards enabling (step 320-a) the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength.
[0059] Further, in an embodiment, the process may include initiating (step 320-b) a timer for the pre-determined amount of time for determining the signal strength associated with the 5G cell upon determining that the signal strength associated with the 5G cell is less the threshold value of the signal strength.
[0060] Fig. 4 illustrates an operational flow diagram 400 depicting a process for managing a VoNR call established in a 4G LTE and 5G NR overlapping area, in accordance with an embodiment of the present subject matter.
[0061] In an embodiment, the process may include initiating (step 402) the VoNR call at the UE.
[0062] Moving forward, the process may proceed towards determining (step 404) whether an occurrence of at least one of one or more inter Radio Access Technology (RAT) reselections and one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area over a pre-determined period of time is greater than a pre-determined threshold number. In an embodiment, where it is determined that the occurrence of the one or more inter Radio Access Technology (RAT) reselections and the one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area over the pre-determined period of time is less than the pre-determined threshold number, the process may proceed towards step 406. In an embodiment, where it is determined that the occurrence of the one or more inter Radio Access Technology (RAT) reselections and the one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area over the pre-determined period of time is greater than the pre-determined threshold number, the process may proceed towards step 408.
[0063] In an embodiment, the process may include continuing (step 406) the VoNR call at the UE through the 5G cell connected to the 5G NR.
[0064] Continuing with the above embodiment, the process may proceed towards disabling (408) disabling a VoNR capability associated with the UE for the pre-determined amount of time. In one embodiment, the VoNR capability may be disabled upon determining that the occurrence of at least one of the one or more inter RAT reselections and the one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area is greater than the pre-determined threshold number. In an embodiment, the VoNR capability may be disabled by setting a RRC "VoiceOverNR" capability bit to FALSE. Furthermore, the process may include, transmitting a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0065] Continuing with the above embodiment, the process may proceed towards triggering (410) the EPS fall back to establish the VoNR call over the 4G LTE.
[0066] In one embodiment, the process may further include determining (step 412) the signal strength associated with the 5G cell connected to the UE and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers over the pre-determined period of time.
[0067] In continuation with the above embodiment, the process may proceed towards enabling (414-a) the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is less than a pre-determined threshold number.
[0068] Further, in an embodiment, the process may include initiating (414-b) a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the 5G cell is less than the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is greater than the pre-determined threshold number.
[0069] Fig. 5 illustrates an operational flow diagram 500 depicting a process for managing a VoNR call established in an area with a moderate signal strength, in accordance with an embodiment of the present subject matter.
[0070] In an embodiment, the process may include initiating (step 502) the VoNR call at the UE.
[0071] Moving forward, the process may proceed towards, determining (step 504) an occurrence of one or more VoNR call drops and one or more VoNR call setup failures upon initiation of the VoNR call over a pre-determined period of time. In an embodiment, where it is determined that the occurrence of at least one of the one or more VoNR call drops and the one or more VoNR call setup failures in the area is less than a pre-determined threshold number, the process may proceed towards step 506. In an embodiment, where it is determined that the occurrence of at least one of the one or more VoNR call drops and the one or more VoNR call setup failures in the area is greater than the pre-determined threshold number, the process may proceed towards step 508.
[0072] In an embodiment, the process may include continuing (step 506) the VoNR call established at the UE through the 5G cell connected to the 5G NR.
[0073] Continuing with the above embodiment, the process may include disabling (step 508) a VoNR capability associated with the UE for a pre-determined amount of time. In an embodiment, the VoNR capability may be disabled upon determining that the occurrence of at least one of the one or more VoNR call drops and the one or more VoNR call setup failures in the area is greater than the pre-determined threshold number. In an embodiment, the VoNR capability may be disabled by setting a RRC "VoiceOverNR" capability bit to FALSE. Furthermore, the process may include, transmitting a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0074] Continuing with the above embodiment, the process may proceed towards triggering (step 510) the EPS fall back to establish the VoNR call over the 4G LTE.
[0075] In one embodiment, the process may further include determining (step 512) after the pre-determined amount of time, the signal strength associated with the 5G cell connected to the UE and the occurrence of the one or more call drops and the one or more call setup failures over the pre-determined period of time.
[0076] In continuation with the above embodiment, the process may proceed towards enabling (step 514-a) the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is less than the pre-determined threshold number.
[0077] Further, in an embodiment, the process may include initiating (step 514-b) a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the 5G cell is less the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is greater than the pre-determined threshold number.
[0078] Fig. 6 illustrates an operational flow diagram 600 depicting a process for managing a VoNR call by a user, in accordance with an embodiment of the present subject matter. In an embodiment, the user may disable a VoNR capability of a UE from device settings associated with the UE.
[0079] In an embodiment, the process may include disabling (step 602) the VoNR capability from the device settings of the UE in response to receiving a command from the user to diable the VoNR capability.
[0080] Continuing with the above embodiment, the process may include determining (step 604) whether the VoNR call is active or not. In an embodiment, where it is determined that the VoNR call is inactive, the process may proceed towards step 608. Further, in an embodiment, where it is determined that the VoNR call is active, the process may proceed towards step 606.
[0081] Moving forward, the process may include waiting (step 606) for the VoNR call to release in response to determining that the VoNR call is active.
[0082] Furthermore, the process may include disabling (step 608) the VoNR capability by the UE. In an embodiment, the VoNR call may be disabled by setting a RRC "VoiceOverNR" capability bit to FALSE. In an embodiment, the disabling of the VoNR call may be permanent. In an embodiment, the disabling of the VoNR call may be temporary for a pre-determined duration of time. In continuation with the above embodiment, the process may proceed towards step 610-a when the VoNR call is permanently disabled. Further, the process may proceed towards 610-b when the VoNR call is disabled temporarily for the pre-determined duration of time. Further, the process may include transmitting a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0083] Subsequent to the above embodiment, the process may include blocking (step 610-a) VoNR services until the VoNR call is enabled by the user from the device settings in the UE.
[0084] Continuing with the above embodiment, the process may include initiating (step 610-b) a timer for the pre-determined duration of time. In an embodiment, the timer may be a ‘X’ timer.
[0085] Moving forward, the process may include determining (step 612) that the timer ‘X’ has expired.
[0086] Furthermore, the process may include determining (step 614) whether that a signal strength associated with the 5G cell is above a threshold value of the signal strength or not. In an embodiment, where it is determined that the signal strength associated with the 5G cell is above the threshold value of the signal strength, the process may proceed towards step 616. Furthermore, in an embodiment, where it is determined that the signal strength associated with the 5G cell is not above the threshold value of the signal strength, the process may backtrack to step 610-b.
[0087] In an embodiment, the process may include enabling (step 616) the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength.
[0088] Continuing with the above embodiment, the process may include terminating (step 618) the process.
[0089] Fig. 7 illustrates a schematic block diagram 700 depicting a method implemented in a UE for managing a VoNR call, in accordance with an embodiment of the present subject matter. In an embodiment, the UE may be capable of establishing the VoNR call on a 5G NR. In an embodiment, where the UE is unable to establish the VoNR call one the 5G NR, the method may include initiating an EPS fall back. In an embodiment, the EPS fallback may include establishing the VoNR call over a 4G LTE.
[0090] In an embodiment, at step 702, the method may include, determining, by the UE, a signal strength of a plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE).
[0091] At step 704, the method includes disabling, by the UE, a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE upon determining the signal strength associated with at least one cell serving the 4G LTE is greater than a threshold value of the signal strength serving the 4G LTE and the signal strength associated with at least one cell serving the 5G NR is less than a threshold value of the signal strength serving the 5G NR.
[0092] At step 706, the method includes transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0093] At step 708, the method includes triggering, by the UE, an EPS fallback to establish the VoNR call over the 4G LTE.
[0094] FIG. 8 is a diagram illustrating the configuration of a terminal 800 in a wireless communication system according to an embodiment of the present subject matter. The configuration of Fig. 6 may be understood as a part of the configuration of the terminal 800. Hereinafter, it is understood that terms including "unit" or "er" at the end may refer to the unit for processing at least one function or operation and may be implemented in hardware, software, or a combination of hardware and software.
[0095] Referring to Fig. 8, the terminal 800 may include a communication unit 802 (e.g., communicator or communication interface), a storage unit 804 (e.g., storage), and a controller 806 (e.g., at least one processor). By way of example, the terminal 800 may be a User Equipment, such as a cellular phone or other device that communicates over a plurality of cellular networks (such as a 4G, a 5G or pre-5G network or any future wireless communication network).
[0096] The storage unit 804 may store data, such as a basic program, an application program, configuration information, and the like for operating the terminal 800. The storage unit 804 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 804 may provide data stored therein in response to a request from the controller 806.
[0097] The controller 806 may control overall operations of the terminal 800. For example, the controller 806 may transmit and receive a signal via the communication unit 802. Further, the controller 806 records data in the storage unit 804 and reads the recorded data. The controller 806 may perform the functions of a protocol stack required by a particular communication standard. To this end, the controller 806 may include at least one processor or micro-processor or may be a part of the processor. Also, a part of the communication unit 802 and the controller 806 may be referred to as a communication processor (CP).
[0098] Referring to fig. 2, the controller 806 may be configured to determine a signal strength of a plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE). Furthermore, the controller 806 may be configured to disable a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE.
[0099] The controller 806 may be configured to disable the VoNR capability upon determining the signal strength associated with at least one cell serving the 4G LTE is greater than a threshold value of the signal strength serving the 4G LTE and the signal strength associated with at least one cell serving the 5G NR is less than a threshold value of the signal strength serving the 5G NR. Furthermore, the communication unit 802 may be configured to transmit a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”. Moving forward, the controller 806 may be configured to trigger an EPS fallback to establish the VoNR call over the 4G LTE.
[0100] Moving forward, the controller 806 may be configured to determine the signal strength associated with the 5G cell connected to the UE after the pre-determined amount of time. Furthermore, the controller 806 may be configured to enable the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength. Furthermore, the controller 806 may be configured to initiating a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength.
[0101] Referring to fig. 3, the controller 806 may be configured to determine a first transmission power required for the UE to connect with the 5G cell to establish the VoNR call. Furthermore, the controller 806 may be configured to determine a second transmission power required for the UE to connect with the 4G cell to establish the VoNR call using the EPS fallback. Furthermore, the controller 806 may be configured to disable a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the first transmission power is greater than the second transmission power by a pre-determined threshold.
[0102] Furthermore, the communication unit 802 may be configured to transmit a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0103] Furthermore, the controller 806 may be configured to determine the signal strength associated with the 5G cell connected to the UE after the pre-determined amount of time. The controller 806 may be configured to enable the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength. The controller 806 may be configured to initiate a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the 5G cell is less the threshold value of the signal strength.
[0104] Referring to Fig. 4, the controller 806 may be configured to monitor an occurrence of one or more inter Radio Access Technology (RAT) reselections and one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area over a pre-determined period of time. The controller 806 may be configured to disable a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining the occurrence at least one of the one or more inter RAT reselections and the one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area is greater than a pre-determined threshold number.
[0105] Furthermore, the communication unit 802 may be configured to transmit a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”. Moving forward, he controller 806 may be configured to trigger an EPS fallback to establish the VoNR call over the 4G LTE.
[0106] The controller 806 may be configured to determine after the pre-determined amount of time, the signal strength associated with the 5G cell connected to the UE and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers over the pre-determined period of time. The controller 806 may be configured to enable the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is less than the pre-determined threshold number.
[0107] Furthermore, the controller 806 may be configured to initiate a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the 5G cell is less the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is greater than the pre-determined threshold number.
[0108] Referring to Fig. 5, the controller 806 may be configured to monitor an occurrence of one or more VoNR call drops and one or more VoNR call setup failures upon initiation of the VoNR call over a pre-determined period of time. The controller 806 may be configured to disable a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining the occurrence at least one of the one or more VoNR call drops and the one or more VoNR call setup failures in the area is greater than a pre-determined threshold number.
[0109] Furthermore, the communication unit 802 may be configured to transmit a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”. The controller 806 may be configured to trigger an EPS fallback to establish the VoNR call over the 4G LTE.
[0110] Further, the controller 806 may be configured to determine, after the pre-determined amount of time, the signal strength associated with the 5G cell connected to the UE and the occurrence of the one or more call drops and the one or more call setup failures over the pre-determined period of time.
[0111] The controller 806 may be configured to enable the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is less than the pre-determined threshold number. The controller 806 may be configured to initiate a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the 5G cell is less the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is greater than the pre-determined threshold number.
[0112] Referring to fig. 6, the communication unit 802 may be configured to receive a command to disable a VoNR capability associated with the UE. The controller 806 may be configured to determine whether the VoNR call at the UE is active or not. The controller 806 may be configured to disable a VoNR capability associated with the UE permanently by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the VoNR call is in-active at the UE. In one embodiment, the controller 806 may be configured to wait for the VoNR call to release by the UE upon determining that the VoNR call is active at the UE and disable a VoNR capability associated with the UE by setting a RRC "VoiceOverNR" capability bit to FALSE. The communication unit 802 may be configured to transmit a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
[0113] The controller 806 may be configured to disable a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the VoNR call is in-active at the UE. The controller 806 may be configured to enable the VoNR capability associated with the UE upon determining that the signal strength associated with the 5G cell is above the threshold value of the signal strength. The controller 806 may be configured to initiate a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the 5G cell is less the threshold value of the signal strength.
[0114] While specific language has been used to describe the present disclosure, any limitations arising on account thereto, are not intended. As would be apparent to a person in the art, various working modifications may be made to the method to implement the inventive concept as taught herein. The drawings and the foregoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment.
,CLAIMS:1. A method for managing a Voice over New Radio (VoNR) call in a 5G User Equipment (UE), the method comprising:
detecting, by the UE, an initiation of the VoNR call over a 5G cell;
detecting, by the UE, a signal strength associated with the 5G cell is below a threshold value of the signal strength associated with the 5G cell and a signal strength associated with a 4G cell is above another threshold value of the signal strength associated with the 4G cell; and
initiating, by the UE, an Evolved Packet System (EPS) fallback process to establish the VoNR call over the 4G cell as a Voice over Long-Term Evolution (VoLTE) call.
2. The method as claimed in claim 1, wherein the 5G UE is VoNR capable and the 5G cell is a VoNR supporting cell.
3. The method as claimed in claim 1 further comprising:
disabling, by the UE, a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE upon determining:
the signal strength associated with the 4G cell is greater than a threshold value of the signal strength serving 4G Long Term Evolution (LTE), and
the signal strength associated with the 5G cell is less than a threshold value of the signal strength serving 5G New Radio (NR); and
transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
4. A method implemented in a User Equipment (UE) for managing a Voice over New Radio (VoNR) call, the method comprising:
determining, by the UE, a signal strength of a plurality of cells serving 5G NR and 4G LTE;
disabling, by the UE, a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE upon determining:
the signal strength associated with at least one cell serving the 4G LTE is greater than a threshold value of the signal strength serving the 4G LTE, and
the signal strength associated with at least one cell serving the 5G NR is less than a threshold value of the signal strength serving the 5G NR; and
transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”; and
triggering, by the UE, an EPS fallback to establish the VoNR call over the 4G LTE.
5. The method as claimed in claim 4, further comprising:
determining, by the UE, the signal strength associated with the at least one cell serving the 5G NR connected to the UE after the pre-determined amount of time; and
performing one of:
enabling, by the UE, the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength; and
initiating, by the UE, a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell serving the 5G NR upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength.
6. The method as claimed in claim 4, wherein the VoNR call is established in an area with a weak signal strength, the method comprising:
determining, by the UE, a first transmission power required for the UE to connect with the at least one cell serving the 5G NR to establish the VoNR call;
determining, by the UE, a second transmission power required for the UE to connect with the at least one cell serving the 4G LTE to establish the VoNR call using the EPS fallback;
disabling, by the UE, a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the first transmission power is greater than the second transmission power by a pre-determined threshold;
transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”;
triggering, by the UE, an EPS fallback to establish the VoNR call over the 4G LTE.
7. The method as claimed in claim 4 & 6, further comprising:
determining, by the UE, the signal strength associated with the at least one cell serving the 5G NR connected to the UE after the pre-determined amount of time; and
performing one of:
enabling, by the UE, the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength; and
initiating, by the UE, a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell serving the 5G NR upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength.
8. The method as claimed in claim 4, wherein the VoNR call is established in a 4G LTE and 5G NR overlapping area, the method comprising:
monitoring, by the UE, an occurrence of one or more inter Radio Access Technology (RAT) reselections and one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area over a pre-determined period of time;
disabling, by the UE, a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining the occurrence of at least one of the one or more inter RAT reselections and the one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area is greater than a pre-determined threshold number;
transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”; and
triggering, by the UE, an EPS fallback to establish the VoNR call over the 4G LTE.
9. The method as claimed in claim 4 & 8, further comprising:
determining, by the UE, after the pre-determined amount of time, the signal strength associated with the at least one cell serving the 5G NR connected to the UE and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers over the pre-determined period of time; and
performing one of:
enabling, by the UE, the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is less than the pre-determined threshold number; and
initiating, by the UE, a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less than the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is greater than the pre-determined threshold number.
10. The method as claimed in claim 4, wherein the VoNR call is established in an area with a moderate signal strength, the method comprising:
monitoring, by the UE, occurrence of one or more VoNR call drops and one or more VoNR call setup failures upon initiation of the VoNR call over a pre-determined period of time;
disabling, by the UE, a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining the occurrence of at least one of the one or more VoNR call drops and the one or more VoNR call setup failures in the area is greater than a pre-determined threshold number;
transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”; and
triggering, by the UE, an EPS fallback to establish the VoNR call over the 4G LTE.
11. The method as claimed in claim 4 & 10, further comprising:
determining, by the UE, after the pre-determined amount of time, the signal strength associated with the at least one cell serving the 5G NR connected to the UE and the occurrence of the one or more call drops and the one or more call setup failures over the pre-determined period of time; and
performing one of:
enabling, by the UE, the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is less than the pre-determined threshold number; and
initiating, by the UE, a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is greater than the pre-determined threshold number.
12. The method as claimed in claim 4, further comprising:
receiving, at the UE, a command to disable a VoNR capability associated with the UE;
determining, by the UE, whether the VoNR call at the UE is active or not;
performing, by the UE, one of:
disabling a VoNR capability associated with the UE permanently by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the VoNR call is in-active at the UE;
waiting for the VoNR call to release by the UE upon determining that the VoNR call is active at the UE; and
disabling a VoNR capability associated with the UE by setting a RRC "VoiceOverNR" capability bit to FALSE; and
transmitting, by the UE, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
13. The method a claimed in claim 4 & 12, further comprising:
disabling a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the VoNR call is in-active at the UE;
performing one of:
enabling, by the UE, the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength; and
initiating, by the UE, a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength.
14. The method as claimed in claim 4, wherein the triggering an EPS fallback to establish the VoNR call over the 4G LTE is based on a plurality of parameters comprising a Block error rate (BLER), a Reference Signal Received Power (RSRP), and a number of retransmissions, one or more of signals associated with the plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE), a battery power associated with the UE, a transmission power to connect with the 4G LTE and the 5G NR associated with the UE, a handover, a call drop rate, a call failure rate, a call packet drop rate, a jitter, and one or more audio quality parameters.
15. A system for managing a Voice over New Radio (VoNR) call in a 5G User Equipment (UE), the system comprising:
detecting, by a controller, an initiation of the VoNR call over a 5G cell;
detecting, by the controller, a signal strength associated with the 5G cell is below a threshold value of the signal strength associated with the 5G cell and a signal strength associated with a 4G cell is above another threshold value of the signal strength associated with the 4G cell; and
initiating, by the controller, an Evolved Packet System (EPS) fallback process to establish the VoNR call over the 4G cell as a VoLTE call.
16. The system as claimed in claim 15, wherein the 5G UE is VoNR capable and the 5G cell is a VoNR supporting cell.
17. The system as claimed in claim 15 further comprising:
disabling, by the controller, a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE upon determining:
the signal strength associated with the 4G cell is greater than a threshold value of the signal strength serving the 4G LTE; and
the signal strength associated with the 5G cell is less than a threshold value of the signal strength serving the 5G NR; and
transmitting, by a communication unit, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
18. A system implemented in a User Equipment (UE) for managing a Voice over New Radio (VoNR) call, the system comprising:
determining, by a controller, a signal strength of a plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE);
disabling, by the controller, a VoNR capability associated with the UE for a pre-determined amount of time by setting a Radio Resource Control (RRC) "VoiceOverNR" capability bit to FALSE upon determining:
the signal strength associated with at least one cell serving the 4G LTE is greater than a threshold value of the signal strength serving the 4G LTE; and
the signal strength associated with at least one cell serving the 5G NR is less than a threshold value of the signal strength serving the 5G NR.
transmitting, by a communication unit, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”; and
triggering, by the controller, an EPS fallback to establish the VoNR call over the 4G LTE.
19. The system as claimed in claim 18, further comprising:
determining, by the controller, the signal strength associated with the at least one cell serving the 5G NR connected to the UE after the pre-determined amount of time; and
performing by the controller one of:
enabling the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength; and
initiating a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength.
20. The system as claimed in claim 18, wherein the VoNR call is established in an area with a weak signal strength, the system comprising:
determining, by the controller, a first transmission power required for the UE to connect with the at least one cell serving the 5G NR to establish the VoNR call;
determining, by the controller, a second transmission power required for the UE to connect with the at least one cell serving the 4G LTE to establish the VoNR call using the EPS fallback;
disabling, by the controller, a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the first transmission power is greater than the second transmission power by a pre-determined threshold;
transmitting, by the communication unit, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”;
triggering, by the controller, an EPS fallback to establish the VoNR call over the 4G LTE.
21. The system as claimed in claim 18 & 20, further comprising:
determining, by the controller, the signal strength associated with the at least one cell serving the 5G NR connected to the UE after the pre-determined amount of time; and
performing, by the controller, one of:
enabling the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength; and
initiating a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength.
22. The system as claimed in claim 18, wherein the VoNR call is established in a 4G LTE and 5G NR overlapping area, the system comprising:
monitoring, by the controller, an occurrence of one or more inter Radio Access Technology (RAT) reselections and one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area over a pre-determined period of time;
disabling, by the controller, a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining the occurrence at least one of the one or more inter RAT reselections and the one or more inter RAT handovers in the 4G LTE and 5G NR overlapping area is greater than a pre-determined threshold number;
transmitting, by the communication unit, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”; and
triggering, by the controller, an EPS fallback to establish the VoNR call over the 4G LTE.
23. The system as claimed in claim 18 & 22, further comprising:
determining, by the controller, after the pre-determined amount of time, the signal strength associated with the at least one cell serving the 5G NR connected to the UE and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers over the pre-determined period of time; and
performing, by the controller, one of:
enabling the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is less than the pre-determined threshold number; and
initiating, by the controller, a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength and the occurrence of the one or more inter RAT reselections and the one or more inter RAT handovers is greater than the pre-determined threshold number.
24. The system as claimed in claim 18, wherein the VoNR call is established in an area with a moderate signal strength, the system comprising:
monitoring, by the controller, an occurrence of one or more VoNR call drops and one or more VoNR call setup failures upon initiation of the VoNR call over a pre-determined period of time;
disabling, by the controller, a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining the occurrence at least one of the one or more VoNR call drops and the one or more VoNR call setup failures in the area is greater than a pre-determined threshold number;
transmitting, by the communication unit, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”; and
triggering, by the controller, an EPS fallback to establish the VoNR call over the 4G LTE.
25. The system as claimed in claim 18 & 24, further comprising:
determining, by the controller, after the pre-determined amount of time, the signal strength associated with the at least one cell serving the 5G NR connected to the UE and the occurrence of the one or more call drops and the one or more call setup failures over the pre-determined period of time; and
performing, by the controller one of:
enabling the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is less than the pre-determined threshold number; and
initiating a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength and the occurrence of the one or more call drops and the one or more call set up failures is greater than the pre-determined threshold number.
26. The system as claimed in claim 18, further comprising:
receiving, at the communication unit, a command to disable a VoNR capability associated with the UE;
determining, by the controller, whether the VoNR call at the UE is active or not;
performing, by the controller, one of:
disabling a VoNR capability associated with the UE permanently by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the VoNR call is in-active at the UE;
waiting for the VoNR call to release by the UE upon determining that the VoNR call is active at the UE; and
disabling a VoNR capability associated with the UE by setting a RRC "VoiceOverNR" capability bit to FALSE; and
transmitting, by the communication unit, a registration request message to a network comprising an NG-RAN-RCU bit set to “NG-RAN radio capability update needed”.
27. The system a claimed in claim 18 & 26, further comprising:
disabling, by the controller, a VoNR capability associated with the UE for a pre-determined amount of time by setting a RRC "VoiceOverNR" capability bit to FALSE upon determining that the VoNR call is in-active at the UE;
performing, by the controller, one of:
enabling the VoNR capability associated with the UE upon determining that the signal strength associated with the at least one cell serving the 5G NR is above the threshold value of the signal strength; and
initiating a timer for the pre-determined amount of time for determining the signal strength associated with the at least one cell upon determining that the signal strength associated with the at least one cell serving the 5G NR is less the threshold value of the signal strength.
28. The system as claimed in claim 18, wherein the triggering an EPS fallback to establish the VoNR call over the 4G LTE is based on a plurality of parameters comprising a Block error rate (BLER), a Reference Signal Received Power (RSRP), and a number of retransmissions, one or more of signals associated with the plurality of cells serving 5G New Radio (NR) and 4G Long Term Evolution (LTE), a battery power associated with the UE, a transmission power to connect with the 4G LTE and the 5G NR associated with the UE, a handover, a call drop rate, a call failure rate, a call packet drop rate, a jitter, and one or more audio quality parameters.