WO2025150067A1

WO2025150067A1 - Methods for control channel enhancements and signalling support for non-terrestrial networks

Info

Publication number: WO2025150067A1
Application number: PCT/IN2025/050027
Authority: WO
Inventors: Santhoshkumar MOORTHY; Pardhasarathy Jyothi; Abhijeet Abhimanyu Masal; Jeniston Deviraj Klutto Milleth; Bhaskar Ramamurthi
Original assignee: Centre of Excellence In Wireless Technology; Indian Institute of Technology Madras
Current assignee: Centre of Excellence In Wireless Technology; Indian Institute of Technology Madras
Priority date: 2024-01-12
Filing date: 2025-01-10
Publication date: 2025-07-17
Anticipated expiration: 2026-07-12

Abstract

A method for enhancing control channel coverage for non-terrestrial network (NTN) in a wireless communication The method comprising determining by at least one first node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel; determining by the at least one first node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH; and signaling by the at least one first node, at least one of the number of repetitions of the at least one PDCCH information and the associated aggregation level to the at least one second node.

Description

METHODS FOR CONTROL CHANNEL ENHANCEMENTS AND SIGNALLING SUPPORT FOR NON-TERRESTRIAL NETWORKS

FIELD OF THE INVENTION

[0001] The present disclosure generally relates to wireless communication and particularly to techniques for enhancing control channel for non-terrestrial network (NTN) by introducing a repetition scheme to enhance the reliability of the 5G NR physical downlink control channel (PDCCH) especially for non-terrestrial network (NTN).

BACKGROUND

[0002] A non-terrestrial network (NTN) refers to a network composed of relays or base stations (BS) boarded in spaceborne vehicles (satellites), high altitude platforms (HAPS) or unmanned arial vehicles (UAVs). The deployment of non-terrestrial network (NTN) helps to extend coverage to remote and sparsely populated rural regions. The fifth generation (5G) new radio (NR) gNBs that are expected to be boarded on the low earth orbit (LEO) satellites may employ a significant number of beams to cover a large geographical area. However, the increased distance between the satellite and user equipment (UE) leads to high path loss, consequently, reduces the link quality and resulting in affecting the overall reliability.

[0003] Further, all 5G satellite networks (operating in frequency range (FR1) as well in (FR2) and covering both geo synchronous orbit (GSO) and non-geo synchronous orbit (NGSO) constellations) to be deployed in the next 10 years may expected to be designed assuming a fixed power. Therefore, there is a strong need to implement downlink (DL) coverage enhancement techniques to reduce Capital Expenditure (CAPEX) and Operational Expenditure (OPEX) for a given targeted coverage.

[0004] Additionally, due to the extensive coverage provided by the satellite, there is a need for a large number of beams. The increase in the number of beams, contributing to expanded coverage, results in the sharing of transmit power among these beams resulting in a reduction in Equivalent Isotropically Radiated Power or Effective Isotropically Radiated Power (EIRP) per beam. The DL link for selected physical channels should be enhanced to improve the quality of the link to accommodate the reduction in EIRP. This could be achieved using techniques such as repetition scheme or equivalent techniques depending on the physical channel. A link budget improvement for physical channels (e.g. PDSCH and PDCCH) should be considered without any impact on the SSB design. In the present disclosure, the repetitions of PDCCH have been introduced.

[0005] Consequently, the primary objective of the present disclosure is to extend advanced wireless services to areas where providing coverage through terrestrial networks is technically challenging or economically impractical like in sparsely populated or remote regions like rural areas, deserts, hills, etc. In the satellite communication, the link between the ground station and the satellite is referred to as the feeder link, while the link between the satellite and the user equipment (UE) is known as the service link, and this link undergoes a severe degradation due to pathloss. The elevation angle refers to the angle under which the airbome/spaceborne platform may be seen by a terminal. The elevation angle is denoted as 9 and 0<|9|<90. In addition to this, multiple hops may occur between non-terrestrial nodes, and the links connecting them are called inter- satellite links (ISLs). The payload carried by the satellite may be either transparent or regenerative, depending on its functionality on board.

[0006] Thus, there is a need in the art to provide techniques to improve the communication link between the satellite and the wireless communication device. To improve the link quality, various physical channels may be enhanced. The objective of the present disclosure is to enhance the physical downlink control channel (PDCCH). The PDCCH is used to transmit the downlink control information (DCI). There are various DCI formats which carries different information such as uplink (UL) and downlink (DL) resource allocation, paging information, system information block (SIB) and group common signalling.

[0007] Particularly, the present disclosure introduces a repetition scheme to enhance the reliability of the 5G NR PDCCH especially for non-terrestrial network (NTN). Additionally, the present disclosure provides a dynamic aggregation level for each repetition, and with increased number of redundancy versions for the increased repetition count.

OBJECT OF THE INVENTION

[0008] It is a general object of the present disclosure to provide methods and apparatuses for enhancing control channel for non-terrestrial network (NTN) by employing repetition scheme. [0009] It is an object of the present disclosure to provide method and apparatus to determine the number of repetitions depending on the elevation angle.

[0010] It is an object of the present disclosure to provide techniques to dynamically adapt the number of repetitions with varying aggregation levels to improve both spectral efficiency and link budget.

[0011] It is an object of the present disclosure to provide techniques to dynamically adapt the number of repetitions associated with aggregation level to improve link quality between the satellite and the UE.

[0012] It is an object of the present disclosure to provide techniques to dynamically adapt the number of repetitions associated with aggregation level based on beam index of the beam in the wireless communication.

SUMMARY

[0013] The present disclosure provides techniques to enhance control channel for nonterrestrial network (NTN) by introducing a repetition scheme to enhance the reliability of the 5G NR physical downlink control channel (PDCCH) especially for non-terrestrial network (NTN).

[0014] In one embodiment, a method for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication is disclosed. The method comprises of determining, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel by at least one first node and determining by the at least one first node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH. The method further comprises of signaling by the at least one first node, at least one of the number of repetitions of the at least one PDCCH information and the associated aggregation level to the at least one second node. [0015] In one aspect, wherein the number of repetitions is configured to one of one or two or four or any other integer value.

[0016] In one aspect, the method further comprises of transmitting the at least one PDCCH after signaling.

[0017] In one aspect, the number of repetitions further comprises of: transmitting, by at least one first node, at least one PDCCH using the number of repetitions.

[0018] In one aspect, the at least one of the number of repetitions of the at least one PDCCH and the aggregation level is configured using one of radio resource control (RRC) or medium access control channel element (MAC CE) or downlink control information (DCI).

[0019] In one aspect, the method of determining the aggregation level further comprising: employing by the at least one first node, a redundancy version (RV) for the repetition of PDCCH, wherein the RV is one of same and different for each repetition.

[0020] In one aspect, the redundancy version 0 (RV0) is associated with the PDCCH transmission without cyclic shifts.

[0021] In one aspect, a mapping of redundancy version is signaled using at least one of RRC and MAC CE and DCI.

[0022] In one aspect, the aggregation level is same or different for the each repetition.

[0023] In one aspect, the aggregation level is configured using information element (IE) in the PDCCH config of RRC.

[0024] In one aspect, the link quality is determined based on a received at least one of reference signal received power (RSRP), or reference signal request quality (RSRQ) or received signal strength indicator (RSSI).

[0025] In one aspect, the received at least one of RSRP or RSRQ or RSSI is determined using an Equivalent Isotropically Radiated Power (EIRP), transmitter antenna gain, path loss, scintillation loss, additional loss, polarization loss, receiver antenna gain. [0026] In one aspect, the method of signaling by the at least one first node further comprising: choosing a look up table associated with a combination of aggregation level and repetition of PDCCH for the elevation angle; and signaling, by the at least one first node, the index of the look up table to the at least one second node through at least one of RRC and MAC CE and DCI.

[0027] In one embodiment, the elevation angle is obtained using at least one of ephemeris information and velocity of the network node.

[0028] In another embodiment, a method for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication is disclosed. The method comprises of receiving by at least one second node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel and receiving by the at least one second node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH. The method further comprises of receiving and decoding, by the at least one second node, at least one PDCCH using at least one of the number of repetition of the at least one PDCCH information and the associated aggregation level.

[0029] In one aspect, the number of repetitions is configured as one of one or two or four or any other integer value.

[0030] In one aspect, the at least one of the number of repetition of the at least one PDCCH and the aggregation level is received using one of radio resource control (RRC) or medium access control channel element (MAC CE) or downlink control information (DCI).

[0031] In one aspect, the method of receiving an aggregation level further comprising: receiving by the at least one second node, a redundancy version (RV) for the repetition of PDCCH, wherein the RV is one of same and different for the repetition.

[0032] In one aspect, the receiving by the at least one second node, a mapping of redundancy version with the index using at least one of RRC and MAC CE and DCI. [0033] In one aspect, the aggregation level is configured using information element (IE) in the PDCCH config of RRC.

[0034] In one aspect, the link quality is determined based on the received at least one of a reference signal received power (RSRP), a reference signal strength indicator (RSSI) and a reference signal received quality (RSRQ).

[0035] In one aspect, the RSRP, RSSI and RSRQ is transmitted to the at least one of first node.

[0036] In one aspect, the method of signaling of the first node further comprising: receiving by the at least one second node, the index of the look up table from the at least one first node through at least one of RRC signaling and MAC CE and DCI.

[0037] In one aspect, the elevation angle is obtained using at least one of ephemeris information and velocity of the network node.

[0038] In another embodiment, an apparatus for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication is disclosed. The apparatus comprising: one or more processor, one or more memory in electronic communication with the one or more processor, and instructions stored in the one or more memory and executable by the one or more processor configured to determine by at least one first node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel, and determine, by the at least one first node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH information. The processor further configured to signal, by the at least one first node, at least one of the number of repetitions of the at least one PDCCH information and the associated aggregation level to the at least one second node.

[0039] In another embodiment, an apparatus for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication is disclosed. The apparatus comprising one or more processor, one or more memory in electronic communication with the one or more processor, and instructions stored in the one or more memory and executable by the one or more processor configured to receive, by at least one second node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, a beam index and a link quality of a wireless communication channel, and receive, by the at least one second node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH. The processor further configured to receive and decode, by the at least one second node, at least one PDCCH repetition using at least one of the number of repetition of the at least one PDCCH information and the associated aggregation level.

[0040] Other aspects and advantages of the present invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Fig. 1 illustrates a schematic overview of the wireless communication in NTN, according to the embodiments described herein.

[0042] Fig. 2 illustrates a schematic diagram of a NR PDCCH chain from TS 38.211, in accordance with an embodiment of the present disclosure.

[0043] Fig. 3 illustrates a flow diagram of PDCCH repetition scheme in accordance with an embodiment of the present disclosure.

[0044] Fig. 4 illustrates flow diagram for ‘N’ redundancy versions (RVs) for ‘N’ PDCCH repetition, in accordance with an embodiment of the present disclosure.

[0045] Fig. 5 illustrates flow diagram for constant and variable aggregation levels for each repetition, in accordance with an embodiment of the present disclosure.

[0046] Fig. 6 illustrates a schematic diagram of RRC signalling of aggregation levels, in accordance with an embodiment of the present disclosure.

[0047] Fig. 7 illustrates an exemplary example of dynamic signaling of number of repetitions based on the beam index, in accordance with an embodiment of the present disclosure. [0048] Fig. 8 illustrates an exemplary example of signaling of number of repetitions with dynamic aggregation level based on the beam index, in accordance with an embodiment of the present disclosure.

[0049] Fig. 9 illustrates a block diagram for a new control channel for wireless communication in the NTN, in accordance with an embodiment of the present disclosure.

[0050] Fig. 10 illustrates an introduction of aggregation level 32 in RRC signaling, in accordance with an embodiment of the present disclosure.

[0051] Fig. 11 illustrates an introduction of information element (IE) elevation angle in RRC signaling, in accordance with an embodiment of the present disclosure.

[0052] Fig. 12 illustrates flow process of choosing of aggregation level by IE based on elevation angle, in accordance with an embodiment of the present disclosure.

[0053] Fig. 13 illustrates a method for enhancing control channel for non-terrestrial network (NTN) in a wireless communication performed by a BS, in accordance with an embodiment of the present disclosure.

[0054] Fig. 14 illustrates a method for enhancing control channel for non-terrestrial network (NTN) in a wireless communication performed by a UE in accordance with an embodiment of the present disclosure.

[0055] Fig. 15 illustrates an apparatus for enhancing control channel for non-terrestrial network (NTN) in a wireless communication performed by a first node or BS, in accordance with an embodiment of the present disclosure.

[0056] Fig. 16 illustrates an apparatus for enhancing control channel for non-terrestrial network (NTN) in a wireless communication performed by a second node or UE, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION [0057] The detailed description set forth below in connection with the appended drawings is intended as a description of various embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. Each embodiment described in this invention is provided merely as an example or illustration of the present invention, and should not necessarily be construed as preferred or advantageous over other embodiments. The detailed description includes specific details for the purpose of providing a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.

[0058] Some embodiments of the present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all, embodiments of the disclosure are shown. Indeed, embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout.

[0059] As used herein, the term “comprising” means including but not limited to and should be interpreted in the manner it is typically used in the patent context. Use of broader terms such as comprises, includes, and having should be understood to provide support for narrower terms such as consisting of, consisting essentially of, and comprised substantially of.

[0060] The phrases “in one embodiment,” “in another embodiment”, “according to one embodiment,” “in some embodiments,” and the like generally mean that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure, and may be included in more than one embodiment of the present disclosure (importantly, such phrases do not necessarily refer to the same embodiment). The expression “at least one of A, B and C” or “at least one of the following: A, B and C” means “only A, or only B, or only C, or any combination of A, B and C.”

[0061] The word “example” or “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other implementations [0062] The following disclosure is intended to particularly describe the implementations of various aspects of the embodiment. The non-terrestrial network (NTN) refers to a network composed of relays or base stations (BS) boarded in spacebome vehicles (satellites), high altitude platforms (HAPS) or unmanned arial vehicles (UAVs). The deployment of nonterrestrial network (NTN) helps to extend coverage to remote and sparsely populated rural regions. The fifth generation (5G) new radio (NR) gNBs that are expected to be boarded on the low earth orbit (LEO) satellites may employ a significant number of beams to cover a large geographical area. However, the increased distance between the satellite and user equipment (UE) leads to high path loss, consequently, reduces the link quality and resulting in affecting the overall reliability.

[0063] Additionally, due to the extensive coverage provided by the satellite, there is a need for a large number of beams. The increase in the number of beams, contributing to expanded coverage, results in the sharing of transmit power among these beams resulting in a reduction in Equivalent Isotropically Radiated Power or Effective Isotropically Radiated Power (EIRP) per beam. The DL link for selected physical channels should be enhanced to improve the quality of the link to accommodate the reduction in EIRP. This could be achieved using techniques such as repetition scheme or equivalent techniques depending on the physical channel. A link budget improvement for physical channels (e.g. PDSCH and PDCCH) should be considered without any impact on the SSB design. In the present disclosure, the repetitions of PDCCH have been introduced.

[0064] Therefore, it is an objective of the present disclosure to extend advanced wireless services to areas where providing coverage through terrestrial networks is technically challenging or economically impractical like in sparsely populated or remote regions like rural areas, deserts, hills, etc.

[0065] In the satellite communication, the link between the ground station and the satellite is referred to as the feeder link, while the link between the satellite and the user equipment (UE) UE is known as the service link, and this link undergoes a severe degradation due to pathloss. The elevation angle refers to the angle under which the airbome/spaceborne platform may be seen by a terminal. The elevation angle is denoted as 9 and 0<|9|<90. In addition to this, multiple hops may occur between non-terrestrial nodes, and the links connecting them are called inter- satellite links (ISLs). The payload carried by the satellite may be either transparent or regenerative, depending on its functionality on board.

[0066] Thus, there is a need in the art to provide techniques to improve the communication link between the satellite and the wireless communication device. To improve the link quality, various physical channels may be enhanced. In particular, the present disclosure introduces a repetition scheme to enhance the reliability of the 5G NR PDCCH especially for non-terrestrial network (NTN). Additionally, the present disclosure provides a dynamic aggregation level for each repetition, and with increased number of redundancy versions for the increased repetition count.

[0067] In an embodiment, the present disclosure describes some aspects of the invention that may be further detailed infra. In accordance with an embodiment, the present disclosure explores the concept of employing 'N' PDCCH repetitions, each with a same or different aggregation level. This approach enhances diversity gain, thereby leading to an improvement in link quality. Similarly, the BS determines the number of repetitions depending on the elevation angle. For instance, for 90-degree elevation angle, generally, it requires minimum number of repetition, and for 10-degree elevation angle it, in general, require maximum number of repetition for the successful reception. Further, the aggregation level may be a function of number of repetitions. Specifically, as the number of repetitions increases, the aggregation level may be decreased.

[0068] In an embodiment, the present disclosure also considers the number of repetition and aggregation level as a function of beam index. For delay tolerant applications, very high aggregation level, such as 128, may be considered, which spans over multiple slots. The radio resource control (RRC) signalling provides information about the number of repetitions and potential aggregation levels to be utilized in a cyclic manner for instance, with 8 repetitions, the aggregation level adheres to a consistent pattern: 32, 16, 8, 4, 2, 1, 32, 16. The number of repetitions of PDCCH information may also be configured by medium access control channel element (MAC CE) or downlink control information (DCI). There is a mapping between number of repetition and aggregation level, and beam index. Likewise, there is a mapping between elevation angle, aggregation level, and number of repetitions. The UE may also estimate the elevation angle based on the SIB 19 information and satellite’s velocity, thereby update the aggregation level and number of repetitions. [0069] For slot level information, the new control channel may be introduced for NR-NTN, but utilizing them only when necessary. This may be used for signalling of dynamic aggregation levels in each slot. In addition to this, the signalling of aggregation levels may also happen through group common DCI. It may be a new DCI format or new indication in one of the legacy DCIs. Instead of signalling the number of repetition and the aggregation level, a look up table may be provided for all the possible number of repetitions, elevation angle and aggregation levels, and only a row index of a table may be informed to the UE when necessary. In scenarios with extremely low link quality, the four symbol CORESET may be considered with very high aggregation level. The link quality may be determined based on at least one of received reference signal received power (RSRP), a reference signal strength indicator (RSSI) and a reference signal received quality (RSRQ) using the EIRP, transmitter antenna gain, path loss, scintillation loss, additional loss, polarization loss, receiver antenna gain.

[0070] The described implementations may be executed in any device, system, or network that is capable of transmitting and receiving radio frequency (RF) signals according to any communication standard, such as Wi-Fi, LTE, LTE-Advanced, Fifth Generation (5G), Wideband Code Division Multiple Access (WCDMA), Global System for Mobile communications/Enhanced Data rate for GSM Evolution (GSM/EDGE), GSM/General Packet Radio Service (GPRS), Worldwide Interoperability for Microwave Access (WiMAX), or Ultra Mobile Broadband (UMB), Terrestrial Trunked Radio (TETRA), Advanced Mobile Phone System (AMPS), or other NTN-IoT, NarrowBand-Intemet of Things (NB-IoT) low power wide area (LPWA). The following embodiments pertain to current technological advances that are especially relevant in the context of 5G NTN, but they may also be used to further the advancement of currently in use wireless communication systems like LTE and 5G advanced.

[0071] The term "RF signal" includes an electromagnetic wave that transmits information from the space between a transmitter and a receiver. Furthermore, the transmitter may broadcast a single RF signal or several RF signals. A detailed description of the embodiments is provided hereafter.

[0072] FIG. 1 is a schematic overview illustrating a wireless communication in non-terrestrial network (NTN) (100) in accordance with an embodiment of the present disclosure. The techniques described herein are implemented by one or more components of the wireless communication system in the NTN. The wireless communication system (100) comprises a base station or a first node and a UE or a second node (102), satellite (104) also referred as space vehicle for NTN functionality, base station or satellite gateway (106), Core Network (CN) (108) and Data Network (DN) (110). The illustration shows a typical 5G NTN system, however, it is understood that many variations may exist in 5G NTN architecture. For instance, an aerial asset or satellite may operate as a bent pipe between UE and base station. The UE may receive signals on Frequency 1 and transmit them on Frequency 2 in order to permit nonterrestrial network connections over a large geographical area. In this architecture, UEs require adequate power and sensitivity to broadcast and receive from the satellite bent pipe. The BS may be ground-based as long as it able connect with the NTN satellite bent pipe. In an alternate architecture, the BS may be located on the airborne or spaceborne asset. In this instance, the UE communicates with the aerial asset. The core network may also be linked to that aerial or spaceborne BS. Additional examples incorporate relay nodes to interact with either the regular UE using satellite bent pipe or with the UEs to an aerial or spaceborne BS. A single core network (108) is illustrated in Fig. 1 for the purpose of simplicity and as an example.

[0073] In the wireless communication network (100) as illustrated in Fig. 1, wireless devices e.g. a UE (102) such as a mobile station, a non-access point (non-AP) STA, a STA, a user equipment (UE) and/or a wireless terminal, communicate via one or more Access Networks (AN), e.g. RANs, to one or more CNs. It is to be understood that “UE” is a non-limiting term which means any terminal, wireless communication terminal, user equipment, Machine Type Communication (MTC) device, Device to Device (D2D) terminal, or node e.g. smart phone, laptop, mobile phone, sensor, relay, mobile tablets or even a small base station capable of communicating using radio communication within the geographical coverage of the satellite. The UE may also be referred as a second node.

[0074] The base stations may be a transmission and reception point e.g. a radio network node such as a Wireless Local Area Network (WLAN) access point or an Access Point Station (AP STA), an access node, an access controller, a base station, e.g. a radio base station such as a NodeB, an evolved Node B (eNB, eNode B), a gNodeB (gNB), a base transceiver station, a radio remote unit, an Access Point Base Station, a base station router, a transmission arrangement of a radio base station, a stand-alone access point or any other network unit or node capable of communicating with a UE within the area served by the network nodes depending e.g. on the RAT and terminology used. The base station may also be referred as a first node. The radio network nodes communicate with the UE in form of downlink (DL) transmissions to the one or more UEs and Uplink (UL) transmissions from the one or more UE.

[0075] In an embodiment, the wireless communication system (100) comprises core network (CN) (108) may provide authentication, authorization, internet protocol (IP) connectivity, routing, mobility, and other access. The CN mat be an evolved packet core (EPC) that includes mobility management entity (MME), serving gateway (S-GW), packet data network (PDN), gateway (P-GW). The satellite (104) may be used to implement NTN functionality in the NTN network. The one or more satellites may be communicatively linked to one or more NTN gateways (105) also referred as earth stations or ground stations.

[0076] Fig. 2 illustrates a schematic diagram of a NR PDCCH chain from TS 38.211, in accordance with an embodiment of the present disclosure. The PDCCH may be used to transmit the downlink control information (DCI) as shown in Fig. 2. There are various DCI formats which carries different information such as UL and DL resource allocation, paging information, SIB and group common signalling. The detection of errors in the PDCCH at the UE involves employing a group of 24 cyclic redundancy check (CRC) 24 bits appended to the DCI payload and subsequently subjected to scrambling based on the DCI information and the corresponding radio network temporary identifier (RNTI). The processed payload may then be directed to a polar coding block, where the coding rate may be determined by either the number of control channel element (CCE) or the aggregation level. The resulting bit count undergoes rate matching, wherein the number of bits is adjusted based on the availability of resource elements. Following this, the bits undergo scrambling, modulation using Quadrature Phase Shift Keying (QPSK), and may be finally mapped onto the resource elements as depicted in Fig. 2.

[0077] Fig. 3 illustrates a flow diagram of PDCCH repetition scheme in accordance with an embodiment of the present disclosure. The satellite/gNB may be configured to repeat the PDCCH transmission, and the UE may be informed to receive these repetitions as shown in the Fig. 3. Typically, one repetition may be considered in each slot to enhance reliability. This is especially beneficial in satellite networks where obtaining Hybrid Automatic Repeat Request (HARQ) acknowledgments takes considerable amount of time. The repetition of PDCCH improves reliability. Additionally, depending on the link quality, the satellite may dynamically decide on whether to configure repetitions for PDCCH. Further, the the number of repetitions may be configured to at least any one of one or two or four or any other integer value. This adaptive approach helps to conserve satellite power when the UE is in good coverage and does not require repetitions of PDCCH.

[0078] Fig. 4 illustrates flow diagram for ‘N’ redundancy versions (RVs) for ‘N’ PDCCH repetition, in accordance with an embodiment of the present disclosure. Presently, there are only four distinct redundancy versions (RVs). Enhancing the repetition count proves more advantageous when each iteration employs different RVs. Consequently, expanding the number of RVs to number of repetitions, as shown in Fig. 4, has the potential to improve the successful reception of each transmission block. Furthermore, the RVs may be introduced for PDCCH. In the present disclosure, ‘N (repetition)’ number of RVs may be introduced for PDCCH to enhance the reliability. That is, for each repetition the redundancy version may be changed. In another way, there may be different mapping between repetition index and the RV index which may be specified by the gNB e.g. 1st repetition with RV-0, 2nd repetition with RV-1, 3rd repetition with RV-2 and remaining repetitions with RV-3. That is, RV0 means PDCCH may be transmitted without cyclic shifts. Further the mapping of redundancy version with the index may be signaled using at least one of RRC and MAC CE and DCI. In one embodiment, within the DCI formats, two bits may be needed to specify the RVs, given the limited number of four distinct RVs. The present disclosure, however, defines RVs based on the number of repetitions, resulting in a variable requirement of bits depending on the repetition count. For example, 8 repetitions may be denoted with 3 bits for RVs, while 16 repetitions may be represented with 4 bits for RVs, and so forth. The redundancy version for the repetition of PDCCH may be same or different for each repetition.

[0079] Fig. 5 illustrates flow diagram for constant and variable aggregation levels for each repetition, in accordance with an embodiment of the present disclosure. In one embodiment, aggregation levels may be expressed in relation to the number of CCEs (Control Channel Elements). Each CCE comprises 6 REGs (Resource Element Groups) or 6 RBs, totalling 72 REs. There may be various aggregation levels range from 1 CCE to 16 CCEs. In satellite networks, introducing additional CCEs may further improve coverage, particularly due to the significant distance between the satellite and UE resulting in a poor link quality. Consequently, expanding the number of CCEs to 32 may enhance coverage in satellite communication. In other words, it impacts all the DCI formats. Based on DCI format, changing the coding rate benefits enhanced energy efficiency. [0080] Additionally, the BS may have the flexibility to determine the aggregation level for each repetition. For example, the BS may configure a fixed aggregation level, such as 32, for all repetitions. Alternatively, the aggregation levels may be gradually reduced as the number of repetitions increases, as shown in Fig. 5. and Fig. 6, potentially enhancing spectrum efficiency. Since the scheduling for each PDCCH repetition occurs at the slot level, with each slot lasting 1ms for a subcarrier spacing (SCS) of 15 KHz, the satellite must wait until the beginning of the next time slot. During this time, the NGSO satellite's beams may shift, leading to changes in the UE's link quality. Therefore, reducing or increasing the aggregation level for subsequent repeated PDCCHs may improve spectral efficiency based on the link quality prediction. This approach also offers diversity, leading to potential improvements in link budget.

[0081] Fig. 6 illustrates a schematic diagram of RRC signalling of aggregation levels, in accordance with an embodiment of the present disclosure. In NTN, the satellite exhibits continuous movement, leading to rapid changes in both the elevation angle and link quality. For instance, a LEO-600 satellite travels at a speed of 7 km/s. Consequently, the elevation angle varies depending on the satellite and UE locations. The satellite chooses the aggregation level based on the elevation angle. For instance, at a lower elevation angle, such as 10 degrees, the satellite may opt for higher aggregation levels, such as 32, to enhance reliability. Therefore, as the elevation angle increases, the satellite may decrease the aggregation level.

[0082] The satellite periodically transmits system information blocks (SIBs) to the UE, containing the current elevation angle. In the absence of SIB, the UE may estimate the elevation angle by considering the known angle, from previous SIB information, and satellite movement. This estimated angle influences the selection of aggregation levels. Therefore, the UE may predict the elevation angle by considering information from the SIB and the orbital parameters of the network node includes ephemeris information of the satellite and a satellite’s velocity. With predicted elevation angle, the UE decides on aggregation level for the blind decoding of PDCCH.

[0083] In another embodiment, the satellite may configure the number of repetitions based on the elevation angle. When the elevation angle decreases the number of repetitions may be increased and vis-a-vis. Elevation angle impacts the probability of line of sight. Specifically, when the elevation angle increases the probability of line of sight increases and so the probability of success increases. Therefore, by reducing the repetition count according to the elevation angle may increase the spectral efficiency. In general, the repetition count may be function of the elevation angle which may be configured to the UE by gNB.

[0084] In an alternate embodiment, instead of simultaneously increasing/decreasing both aggregation level and the number of repetitions, it may be beneficial to opt for either increasing/decreasing aggregation level or the number of repetitions. Additionally, when the number of repetitions is higher, a lower aggregation level may be recommended, whereas a higher aggregation level may be suitable when the number of repetitions is lower.

[0085] In an additional embodiment, when the link quality is very poor, the very high aggregation level may be configured such as 128 which spans over multiple slots. As the CORESET may not enough for AL 128, provided satellite communication works on delay torrent application, it may be transmitted a part of PDCCH in the next slot so that the link budget may be enhanced.

[0086] Fig. 7 illustrates an exemplary example of dynamic signaling of number of repetitions based on the beam index, in accordance with an embodiment of the present disclosure. As the satellite undergoes continuous movement, the beam shifts, and so the serving beam of UE changes. When the UE is positioned at the nadir, minimal repetition may be needed for successful transport block reception. Beams located at the extreme ends exhibit a lower link quality, necessitating a maximum number of repetitions. The beams located between the center and the extreme ends necessitate the utilization of repetitions within the range of minimum and maximum repetitions counts as shown in Fig. 7.

[0087] Fig. 8 illustrates an exemplary example of signaling of number of repetitions with dynamic aggregation level based on the beam index, in accordance with an embodiment of the present disclosure. As the satellite undergoes continuous movement, the beam shifts, influencing the UE's location. When the UE is at nadir, a low aggregation level may be needed, as illustrated in Fig. 8, for the successful reception of the transport block. Beams at the extreme ends exhibit a lower link quality, necessitating a higher number of repetitions. For beams situated between the centre and extreme ends, optimal aggregation levels may be required.

[0088] In another embodiment, for each beam index, the number of repetition and aggregation levels may be preconfigured through RRC signalling. The UE may have the information of beam index when it switches from one beam to another beam, and based on beam index the UE decides on the aggregation level and number of repetitions. In one embodiment, at the beginning of every time slot, the UE may estimate the aggregation level based on the information received from SIB 19, such as ephemeris, and the velocity of the satellite. SIB 19 may be transmitted periodically to the UE. Therefore, the UE either may have original elevation angle or estimated elevation angle based on the recent SIB information.

[0089] In one embodiment, multiple mappings exist between elevation angle, aggregation level, and the number of repetitions. One specific example is illustrated below, wherein the maximum number of repetitions may be associated with lower aggregation levels and low elevation angles. Examples illustrate that for higher repetition factor, aggregation level may be lower. Further this may be done for lower elevation angle as link may be poor in this case. In general, the mapping between elevation angle, aggregation level and number of repetitions may be specified in the standards and provided in the look up table. The knowledge of link condition may be used in the selection of an appropriate number of repetitions and aggregation level from the mapping as shown in the table below. The look up table associated with the combination of aggregation level and repetition of PDCCH for each elevation angle may be chosen and signal the index of the look up table to the UE through at least one of RRC and MAC CE and DCI.

[0090] In an embodiment, incorporating a very high aggregation level, such as 128, may need the four-symbol coreset to accommodate all the control information within a slot. Until now, only a maximum of three-symbol coreset has been available. The introduction of a four-symbol coreset may result in a 33% increase in resources available for control information. When the number of CORESET symbols exceeds 3, it may increase the resource availability and making it convenient for handling control heavy traffic, prioritizing control signals over data. [0091] Fig. 9 illustrates a block diagram for a new control channel for wireless communication in the NTN, in accordance with an embodiment of the present disclosure. To indicate the diverse aggregation levels within each slot, Physical Control Format Indicator Channel (PCFICH) in LTE may be used. However, this channel may be not defined in 5G NR, since the coreset configuration provided in RRC signalling. The PCFICH may be reintroduced in the case of NTN as a special scenario, contributing to an improvement in link quality. Furthermore, its utilization may be restricted to instances where it is considered essential. The aggregation levels, 1, 2, 4, 8, 16, 32, may be encoded and provided as input to the scrambling block. Subsequently, they undergo modulation using QPSK. The symbols may then be assigned to the resource elements which may be allocated in the first OFDM symbol of the resource grid. The process is depicted in Fig. 9. Consequently, the UE scans the first OFDM symbol to extract information about the aggregation level.

[0092] The signalling of aggregation levels for repeated PDCCH may be provided through the group common signalling. For example, if there are 8 repetitions, each with a different aggregation level, then the details may be incorporated into DCI and transmitted in the preceding slot via PDCCH. This allows the User Equipment (UE) to decode DCI and retrieve the aggregation level for the repeated PDCCH in the next slot. Initial aggregation level may be shared through RRC signalling. The modification in the aggregation level, either increase or decrease in the aggregation level by a factor, for instance the factor may be one level up or down, based on elevation angle.

[0093] In another embodiment, a lookup table may be generated for each elevation angle or other parameters, indicating the possible combinations of repetition and aggregation level. This table may be known in prior to both the UE and BS. Consequently, conveying a row index to the UE through RRC signalling enables the UE to access information about the aggregation level employed for each repetition.

[0094] Fig. 10 illustrates an introduction of aggregation level 32 in RRC signaling, in accordance with an embodiment of the present disclosure. The aggregationLeve!32 may be introduced in nrofCandidates information element as shown in Fig. 10. The aggregation level may be variable for each elevation angle. For instance, the aggregation level may be lower for low elevation angle and the aggregation level may be higher for high elevation angel. Further, the aggregation level may be a function of number of repetitions, as the number of repetitions increases, the aggregation level may be decreased.

[0095] Fig. 11 illustrates an introduction of information element (IE) elevation angle in RRC signaling, in accordance with an embodiment of the present disclosure. The new information element elevationAngle, as illustrated in Fig. 10, may be defined where it may choose one of the elevation angles based on the SIB 19, which may have the elevation angle received from satellite. The satellite conveys the elevation angle to the UE via SIB 19 at regular intervals. Upon receiving SIB 19, the UE may obtain the original elevation angle, enabling it to determine the appropriate repetition and aggregation levels. When SIB 19 is unavailable, the UE may estimate the elevation angle and may use it to select the aggregation level and repetition count. Consequently, the UE may have better accuracy on the elevation angle, if the periodicity of SIB 19 is less.

[0096] Fig. 12 illustrates flow process of choosing of aggregation level by IE based on elevation angle, in accordance with an embodiment of the present disclosure. The information element "nrofCandidates" may undergo modification based on the elevation angle, as illustrated in Fig. 12. If the elevation angle is below 20, the satellite may utilize "aggregationLevel32" , in case of an elevation angle between 20 and 40, "aggregationLevell6" may be selected. Similarly, for elevation angles between 40 and 60, " aggregationLevel8" may be selected. For elevation angles of 70, 80, and 90, "aggregationLevel4 " " aggregationLevel2 ," and " aggregationLevei may be considered, respectively.

[0097] Fig. 13 illustrates a method (1300) for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication performed by a first node or the BS, in accordance with an embodiment of the present disclosure. In an embodiment, the method comprises of determining (1302) by at least one first node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel, and determining (1304) by the at least one first node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH. The method further comprises of signaling (1306) by the at least one first node, at least one of the number of repetitions of the at least one PDCCH information and the associated aggregation level to the at least one second node. [0098] Fig. 14 illustrates a method (1400) for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication performed by a second node or the UE in accordance with an embodiment of the present disclosure. The method comprises of receiving (1402) by at least one second node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel, and receiving (1404) by the at least one second node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH. The method further comprises of receiving and decoding (1406), by the at least one second node, at least one PDCCH using at least one of the number of repetition of the at least one PDCCH information and the associated aggregation level.

[0099] Fig. 15 illustrates an apparatus (1500) for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication performed by a first node or the BS, in accordance with an embodiment of the present disclosure. The apparatus may be an example of or include the components of a base station (1502). The apparatus may comprise one or more processor (1504), one or more memory (1506), a transceiver (1508), a controller (1512), a communication network (1516), a communication module (1514) and antennas (1510a-n) configured to perform the methods herein. The memory is in electronic communication with the one or more processor and instructions stored in the one or more memory and executable by the one or more processor. The base station transceiver further includes a transmitter and a receiver to transmit and receive signal from the wireless communication device. The processor of the base station may be configured to perform the methods herein.

[0100] The processor (1504) of the BS may be configured to determine by at least one first node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel, and determine, by the at least one first node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH information. The processor (1504) may be further configured to signal, by the at least one first node, at least one of the number of repetitions of the at least one PDCCH information and the associated aggregation level to the at least one second node. [0101] Fig. 16 illustrates an apparatus (1600) for enhancing control channel coverage for nonterrestrial network (NTN) in a wireless communication performed by a second node or the UE, in accordance with an embodiment of the present disclosure. The apparatus may be an example of or include the components of the UE (1602) or (102). The apparatus may comprise one or more processor (1604), one or more memory (1606), a transceiver (1608), a controller (1612), a communication module (1614) and antennas (1610a-n) configured to perform the methods herein. The memory is in electronic communication with the one or more processor and instructions stored in the one or more memory and executable by the one or more processor. The transceiver of UE further includes a transmitter and a receiver to transmit and receive signal from the wireless communication device. The processor of the UE may be configured to perform the methods herein.

[0102] The processor (1604) of the UE may be configured to receive, by at least one second node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, a beam index and a link quality of a wireless communication channel, and receive, by the at least one second node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH. The processor (1604) of the UE may be further configured to receive and decode, by the at least one second node, at least one PDCCH repetition using at least one of the number of repetition of the at least one PDCCH information and the associated aggregation level.

[0103] In an embodiment of this disclosure, an antenna and a radio frequency circuit that have a receiving and sending function may be considered as a transceiver unit of the terminal. The transceiver unit may also be referred to as a transceiver (including a transmitter and/or a receiver), a transceiver machine, a transceiver apparatus, or the like. The processing unit may also be referred to as a processor, a processing module, a processing apparatus, or the like. Optionally, a component configured to implement a receiving function in the transceiver unit may be considered as a receiving unit, and a component configured to implement a sending function in the transceiver unit may be considered as a transmitting unit. In other words, the transceiver unit includes the receiving unit and the transmitting unit. This is not to be accorded as a limitation of the embodiment described in this disclosure. [0104] In some embodiments, the transceiver unit and the processing unit may be integrated together or may be disposed independently. In addition, all functions of the processing unit may be integrated into one chip for implementation. Alternatively, some functions may be integrated into one chip for implementation and some other functions are integrated into one or more other chips for implementation.

[0105] The figures of the disclosure are provided to illustrate some examples of the invention described. The figures are not to limit the scope of the depicted embodiments or the appended claims. Aspects of the disclosure are described herein with reference to the invention to example embodiments for illustration. It should be understood that specific details, relationships, and method are set forth to provide a full understanding of the example embodiments. One of ordinary skill in the art recognize the example embodiments may be practiced without one or more specific details and/or with other methods.

[0106] Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the embodiments described above should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems may generally be integrated together in a single software product or packaged into multiple software products.

[0107] Aspects of the present disclosure may be implemented as computer program products that comprise articles of manufacture. Such computer program products may include one or more software components including, for example, applications, software objects, methods, data structure, and/or the like. In some embodiments, a software component may be stored on one or more non-transitory computer-readable media, which computer program product may comprise the computer-readable media with software component, comprising computer executable instructions, included thereon. The various control and operational systems described herein may incorporate one or more of such computer program products and/or software components for causing the various conveyors and components thereof to operate in accordance with the functionalities described herein. [0108] A software component may be coded in any of a variety of programming languages. An illustrative programming language may be a lower-level programming language such as an assembly language associated with a particular hardware architecture and/or operating system platform/system. Other example of programming languages included, but are not limited to, a macro language, a shell or command language, a job control language, a script language, a database query, or search language, and/or report writing language. In one or more example embodiments, a software component comprising instructions in one of the foregoing examples of programming languages may be executed directly by an operating system or other software component without having to be first transformed into another form. A software component may be stored as a file or other data storage methods. Software components of a similar type or functionally related may be stored together such as, for example, in a particular directory, folder, or repository. Software components may be static (e.g., pre-established, or fixed) or dynamic (e.g., created or modified at the time of execution).

[0109] While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any disclosures or of what may be claimed, but rather as descriptions of features specific to particular embodiments of particular disclosures. Certain features that are described herein in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination may in some cases be excised from the combination, and the claimed combination may be directed to a sub combination or variation of a sub combination.

[0110] Thus, particular embodiments of the subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims may be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In certain implementations, multitasking and parallel processing may be advantageous. [0111] It is to be understood that the disclosure is not to be limited to the specific embodiments disclosed, and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation, unless described otherwise.

Claims

WE CLAIM:

1. A method for enhancing control channel coverage for non-terrestrial network (NTN) in a wireless communication, the method comprising: determining by at least one first node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel; determining by the at least one first node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH; and signaling by the at least one first node, at least one of the number of repetitions of the at least one PDCCH information and the associated aggregation level to the at least one second node.

2. The method as claimed in claim 1, wherein the number of repetitions is configured to one of one or two or four or any other integer value.

3. The method as claimed in claim 1, further comprises transmitting the PDCCH after signaling.

4. The method as claimed in claim 1, wherein the number of repetitions further comprises: transmitting, by at least one first node, at least one PDCCH using the number of repetitions.

5. The method as claimed in claim 1, wherein the at least one of the number of repetitions of the at least one PDCCH and the aggregation level is configured using one of radio resource control (RRC) or medium access control channel element (MAC CE) or downlink control information (DCI).

6. The method as claimed in claim 1, wherein the determining the aggregation level further comprising: employing, by the at least one first node, a redundancy version (RV) for the repetition of PDCCH, wherein the RV is one of same and different for each repetition.

7. The method as claimed in claim 6, wherein the redundancy version 0 (RVO) is associated with the PDCCH transmission without cyclic shifts.

8. The method as claimed in claim 6, wherein a mapping of redundancy version is signaled using at least one of RRC and MAC CE and DCI.

9. The method as claimed in claim 1, wherein the aggregation level is same or different for the each repetition.

10. The method as claimed in claim 1, wherein the aggregation level is configured using information element (IE) in the PDCCH config of RRC.

11. The method as claimed in claim 1, wherein the link quality is determined based on a received at least one a reference signal received power (RSRP) or a reference signal request quality (RSRQ) or a received signal strength indicator (RSSI).

12. The method as claimed in claim 8, wherein the received at least one the RSRP or the RSRQ or the RSSI is determined using an Equivalent Isotropically Radiated Power (EIRP), transmitter antenna gain, path loss, scintillation loss, additional loss, polarization loss, receiver antenna gain.

13. The method as claimed in claim 1, wherein the signaling by the at least one first node further comprising: choosing a look up table associated with a combination of aggregation level and repetition of PDCCH for the elevation angle; and signaling, by the at least one first node, the index of the look up table to the at least one second node through at least one of RRC and MAC CE and DCI.

14. The method as claimed in claim 1, wherein the elevation angle is obtained using at least one of ephemeris information and velocity of the network node.

15. A method for enhancing control channel coverage for non-terrestrial network (NTN) in a wireless communication, the method comprising: receiving by at least one second node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel; receiving by the at least one second node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH; and receiving and decoding, by the at least one second node, at least one PDCCH using at least one of the number of repetition of the at least one PDCCH information and the associated aggregation level.

16. The method as claimed in claim 1, wherein the number of repetitions is configured as one of one or two or four or any other integer value.

17. The method as claimed in claim 15, wherein the at least one of the number of repetition of the at least one PDCCH and the aggregation level is received using one of radio resource control (RRC) or medium access control channel element (MAC CE) or downlink control information (DCI).

18. The method as claimed in claim 15, wherein the receiving an aggregation level further comprising: receiving by the at least one second node, a redundancy version (RV) for the repetition of PDCCH, wherein the RV is one of same and different for the repetition.

19. The method as claimed in claim 18, wherein the receiving by the at least one second node, a mapping of redundancy version with the index using at least one of RRC and MAC CE and DCI.

20. The method as claimed in claim 18, wherein the aggregation level is configured using information element (IE) in the PDCCH config of RRC.

21. The method as claimed in claim 18, wherein the link quality is determined based on the received at least one of a reference signal received power (RSRP), a reference signal strength indicator (RSSI) and a reference signal received quality (RSRQ).

22. The method as claimed in claim 21, wherein the RSRP, RSSI and RSRQ is transmitted to the at least one of first node.

23. The method as claimed in claim 15, signaling of the first node further comprising: receiving by the at least one second node, the index of the look up table from the at least one first node through at least one of RRC signaling and MAC CE and DCI.

24. The method as claimed in claim 15, wherein the elevation angle is obtained using at least one of ephemeris information and velocity of the network node.

25. An apparatus for enhancing control channel coverage for non-terrestrial network (NTN) in a wireless communication, the apparatus comprising: one or more processor; one or more memory in electronic communication with the one or more processor, and instructions stored in the one or more memory and executable by the one or more processor configured to: determine by at least one first node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, an antenna beam index and a link quality of a wireless communication channel; determine, by the at least one first node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH information; and signal, by the at least one first node, at least one of the number of repetitions of the at least one PDCCH information and the associated aggregation level to the at least one second node.

26. An apparatus for enhancing control channel coverage for non-terrestrial network (NTN) in a wireless communication, the apparatus comprising: one or more processor; one or more memory in electronic communication with the one or more processor, and instructions stored in the one or more memory and executable by the one or more processor configured to: receive, by at least one second node, number of repetitions of at least one physical downlink control channel (PDCCH) information based on at least one of an elevation angle, a beam index and a link quality of a wireless communication channel; receive, by the at least one second node, an aggregation level based on the at least one of elevation angle, beam index and the link quality for the repetition of the at least one PDCCH; receive and decode, by the at least one second node, at least one PDCCH repetition using at least one of the number of repetition of the at least one PDCCH information and the associated aggregation level.