Techniques for CSI feedback reduction

Abstract

The adaptation of spatial elements and / or downlink transmission power is a category of network energy saving techniques that reduces the power consumption of communication system Further, multiple channel state information (CSI) reports corresponding to the different adaptations with different number of spatial elements and / or transmission power are required to be reported by the UE to enable the optimal adaptation at gNB. However, reporting with large number of CSIs corresponding to different adaptations lead to huge uplink overhead and its implication on the power consumption at the user equipment (UE) is a serious issue that needs to be addressed. Further, the CSIs corresponding to different adaptations are correlated with each other which increases redundancy in the CSI reporting. Therefore, reduction in CSI feedback reporting corresponding to multiple spatial and / or power adaptations is of great importance for uplink overhead reduction and UE power saving. The main objective of this invention is to propose techniques to reduce the number of CSI reports, reported for multiple spatial and / or power adaptations, based on various report quantities of the CSI and the correlation between them to reduce the uplink overhead of the UE. Further, the invention contains two step reporting of CSIs for multiple adaptation with partial CSI reporting and propose various methods to report differential values of CSI report quantities such as channel quality indicator.

Description

TECHNIQUES FOR CSI FEEDBACK REDUCTIONFIEED OF INVENTION

[0001] The present disclosure generally relates to the field of wireless communications. Particularly, the present disclosure relates to techniques for Channel State Information (CSI) feedback reduction in a wireless communication.BACKGROUND

[0002] The subject matter discussed in the background section should not be assumed to be prior art merely as a result of its mention in the background section. Similarly, a problem mentioned in the background section or associated with the subject matter of the background section should not be assumed to have been previously recognized in the prior art. The subject matter in the background section merely represents different approaches, which in and of themselves may also correspond to implementations of the claimed technology.

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. These systems have developed through various generations to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). A fifth generation (5G) wireless standard, referred to as New Radio (NR), enables higher data transfer speeds, greater numbers of connections, and better coverage, among other improvements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology.OBJECTIVE OF THE INVENTION

[0004] A general objective of the present invention is to provide techniques for CSI feedback reduction in wireless communication.

[0005] Another objective of the present invention is to provide a method for reducing CSI reporting payload in wireless communication.

[0006] Yet another objective of the present invention is to provide techniques to reduce the number of CSI reports, reported for multiple spatial and / or power adaptations, based on various report quantities of the CSI and the correlation between them to reduce the uplink overhead of the UE.

[0007] Yet another objective of the present invention is to provide techniques to propose various methods to report differential values of CSI report quantities in wireless communication.SUMMARY OF THE INVENTION

[0008] In general, embodiments of the present disclosure herein provide methods for reducing CSI reporting payload in wireless communication. Other implementations will be or will become, apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional implementations be included within this description be within the scope of the disclosure and be protected within the scope of the following claims.

[0009] In one embodiment, the present disclosure provides a method of reporting Channel State Information (CSI) in a wireless communication system. The method comprises, receiving by at least one node, at least one first configuration, for measuring at least one CSI report quantity. The method further comprises, receiving by the at least one node, at least one reference signal based on the at least one first configuration. The method further comprises, measuring by the at least one node, at least one CSI report quantity using the at least one reference signal. The method further comprises, determining a first value of at least one CSI report quantity for a second configuration chosen from the at least one first configuration. The method further comprises, determining at least one offset associated with the at least one CSI report quantity of at least one third configuration.

[0010] In another embodiment, the present disclosure provides a method of reporting Channel State Information (CSI) in a wireless communication system. The method comprises, receiving by at least one node, at least one report configuration for CSI reporting, wherein the at least one report configuration comprises at least one of at least one CSI report quantity and at least one sub-configuration. The method further comprises, measuring by at least one node, at least one CSI report quantity for the at least one sub-configurations. The method further comprises, categorizing by at least one node, the at least one CSI report quantity of at least one sub-configurations into two groups. The method further comprises, reporting by the at least one node, the value of at least one CSI report quantity of at least one sub-configurations based on the categorization.

[0011] In another embodiment, the present disclosure provides a method of receiving Channel State Information (CSI) in a wireless communication system. The method comprises, transmitting by at least one node, at least one first configuration, for measuring at least one CSI report quantity. The method further comprises, transmitting by the at least one node, at least one reference signal based on the at least one first configuration. The method further comprises, receiving by the at least one node, at least one of: a first value of at least one CSI report quantity for a second configuration, and at least one offset associated with the at least one CSI report quantity of at least one third configuration.

[0012] In another embodiment, the present disclosure provides a method of receiving Channel State Information (CSI) in a wireless communication system. The method comprises, transmitting by at least one node, at least one report configuration for CSI reporting, wherein the at least one report configuration comprises at least one of at least one CSI report quantity and at least one sub -configuration. The method further comprises, receiving by the at least one node, the value of at least one CSI report quantity of at least one sub-configurations based on a categorization.

[0013] The above summary is provided merely for the purpose of summarizing some exemplary embodiments to provide a basic understanding of some aspects of the present disclosure. Accordingly, it will be appreciated that the above-described embodiments are merely examples and should not be construed to narrow the scope or spirit of the present disclosure in any way. It will be appreciated that the scope of the present disclosure encompasses many potential embodiments in addition to those here summarized, some ofwhich will be further described below. Other features, aspects, and advantages of the subject will become apparent from the description, the drawings, and the claims.BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Having thus described the embodiments of the disclosure in general terms, reference now will be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:

[0015] FIG. 1 is a schematic overview of the wireless communication network according to the embodiments described herein.

[0016] FIG. 2 is a diagram depicting Type 1 spatial adaptation in accordance with an embodiment of the present disclosure.

[0017] FIG. 3 is a diagram depicting Type 2 spatial adaptation in accordance with an embodiment of the present disclosure.

[0018] FIG. 4 is a diagram depicting grouping of common and individual CSI report quantities in accordance with an embodiment of the present disclosure.

[0019] FIG. 5 is a diagram depicting grouping of sub-configurations for segregation of CSI report quantities in accordance with an embodiment of the present disclosure.

[0020] FIG. 6 illustrates the components that may be employed in a user equipment (UE), a base station respectively, and configured to support wireless communications in accordance with an embodiment of the present disclosure.

[0021] FIG. 7 illustrates a method of reporting Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure.

[0022] FIG. 8 illustrates a method of reporting Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure.

[0023] FIG. 9 illustrates a method of receiving Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure.

[0024] FIG. 10 illustrates a method of receiving Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION OF THE INVENTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] The phrases “in one 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 presentdisclosure, and may be included in more than one embodiment of the present disclosure (importantly, such phrases do not necessarily refer to the same embodiment).

[0029] 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.

[0030] Embodiments herein are described within the context of 5G NR radio technology. It is to be appreciated that the problems and solutions mentioned herein apply equally to wireless access networks and UEs that use different access technologies and standards. NR is used as an example technology where embodiments are appropriate, and include NR in the description is therefore very valuable for understanding the problem and finding solutions to it. In particular, embodiments are equally applicable to 3GPP LTE, or 3GPP LTE plus NR integration.

[0031] Further, many aspects are described in terms of sequences of actions to be performed by, for example, elements of a computing device. It will be recognized that various actions described herein can be performed by specific circuits (e.g., application specific integrated circuits (ASICs)), by program instructions being executed by one or more processors, or by a combination of both. Additionally, the sequence(s) of actions described herein can be considered to be embodied entirely within any form of non- transitory computer-readable storage medium having stored therein a corresponding set of computer instructions that, upon execution, would cause or instruct an associated processor of a device to perform the functionality described herein. Thus, the various aspects of the disclosure may be embodied in a number of different forms, all of which have been contemplated to be within the scope of the claimed subject matter.

[0032] As used herein, the terms “user equipment” (UE) and “base station” are not intended to be specific or otherwise limited to any particular radio access technology (RAT), unless otherwise noted. In general, a UE may be any wireless communication device (e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, wearable (e.g., smartwatch, glasses, augmented reality (AR) / virtual reality (VR) headset, etc.), vehicle (e.g., automobile, motorcycle, bicycle, etc.), Internet of Things (loT) device, etc.) used by a user to communicate over a wireless communications network. A UE may be mobile or may (e.g., atcertain times) be stationary, and may communicate with a radio access network (RAN). Generally, UEs can communicate with a core network via a RAN, and through the core network the UEs can be connected with external networks such as the Internet and with other UEs. Of course, other mechanisms of connecting to the core network and / or the Internet are also possible for the UEs, such as over wired access networks, wireless local area network (WLAN) networks (e.g., based on IEEE 802.11, etc.) and so on.

[0033] A base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an access point (AP), a network node, a NodeB, an evolved NodeB (eNB), a New Radio (NR) Node B (also referred to as a gNB or gNodeB), etc.

[0034] FIG. 1 is a schematic overview illustrating a wireless communication network (100) in accordance with an embodiment of the present disclosure. The wireless communication network (100) comprises one or more Radio Access Networks (RANs) and one or more Core Networks (CNs). A single core network (106) is illustrated in Fig. 1 for the purpose of simplicity and as an example. The wireless communication network (100) may implement one or more of different technologies, such as W-Fi, LTE, LTE-Advanced, Fifth Generation (5G), WCDMA, Global System for Mobile communications / Enhanced Data rate for GSM Evolution (GSM / EDGE), Worldwide Interoperability for Microwave Access (WiMAX), or Ultra Mobile Broadband (UMB). The following embodiments pertain to current technological advances that are especially relevant in the context of 5G, but they may also be used to further the advancement of currently in use wireless communication systems like WCDMA and LTE.

[0035] In the wireless communication network (100) as illustrated in Fig. 1, wireless devices e.g. a UE (102a- 102d) 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 nonlimiting 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 with a network node within the geographical area (1, 2, 3) served by one or more base station (BS) (104a-104c).

[0036] In an embodiment, the wireless communication network (100) comprises one or more radio network nodes (RAN) (104a- 104c) providing coverage over geographical areas (1, 2 and 3) of a RAT, such as NR, LTE, WiMAX or the like. The radio network nodes or the base stations (104a- 104c) 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 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.

[0037] Network energy saving (NES) is a critical requirement in cellular networks to reduce the overall cost of the network. It will also reduce the carbon emission of the network making it a green wireless communication technology. A large portion of total network energy consumption comes from hardware usage at the base station (BS) and its activity. For e.g., a BS with large number of spatial elements if operated all the time consumes more energy. An antenna port is defined such that the channel over a symbol on the antenna port is conveyed can be inferred from the channel over another symbol on the same antenna port is conveyed. The antenna port is mapped to one or more physical antenna elements. NES can be achieved by adapting the number of spatial elements used for transmission and reception using spatial adaptation pattern, and the mechanism is called as spatial adaptation. There are 2 types of spatial adaptations defined for NES.

[0038] Type 1 spatial adaptation: The spatial elements are turned off by reducing the number of ports without altering the number of elements per port used for transmission / reception.

[0039] Type 2 adaptation: The spatial elements are turned off such that the number of transmit receive units (TXRUs) per port reduces without altering the number of ports used for transmission / reception.

[0040] To determine the number of spatial elements needed for transmission and reception, the BS requires channel state information (CSI) corresponding to different adaptation patterns from the user equipment (UE). To obtain the CSI, the BS configures and transmits reference signal (RS) to the UE, where the configuration comprises scheduling information of RS, the parameters to be reported and the scheduling information for transmitting the report. The UE receives the RS, measures various parameters of the channel using the RS and reports the parameters to the gNB.

[0041] In one method, the BS transmits one or more RSs corresponding to each adaptation pattern and configures UE to measure the parameters using RSs corresponding to different adaptation patterns and report the parameters for each adaptation pattern. E.g., BS configures a CSI report configuration having parameters to report for 32 ports and scheduling information for transmitting the report. Further, each CSI report configuration is linked to an RS configuration containing scheduling information for receiving RS corresponding to 32 ports. Therefore, UE receives RS corresponding to 32 ports, measure parameters for 32 ports and report the parameters to the gNB. The advantage is that the measurements will be accurate, as UE receives RS corresponding to each adaptation pattern. However, this method results in multiple RS signal transmissions.

[0042] In another method, the BS transmits one or more RSs corresponding to an adaptation pattern and configures UE to measure and report parameters corresponding to different adaptation patterns using the transmitted RS. E.g., BS configures a CSI report configuration having scheduling information for transmitting the report, the parameters to be reported and one or more sub configurations indicating the parameters that have to be calculated for 32, 16 and 8 ports. Further, the CSI report configuration and sub configurations is linked to an RS configuration containing scheduling information for receiving the RS corresponding to 32 ports. Therefore, UE receives the RS corresponding to 32 ports, determines parameters corresponding to 32, 16 and 8 ports and reports them to the gNB. The advantage with this method is that multiple RS transmission corresponding to each adaptation pattern is not needed. However, the penalty is reduction in measurement accuracy.

[0043] FIG. 2 is a diagram depicting Type 1 spatial adaptation in accordance with an embodiment of the present disclosure. For type 1 spatial adaptation, a UE is configured withone or more CSI-RS resources within a CSI-RS resources set, where all resources within a resource set are transmitted using an adaptation pattern (e.g., 32 ports) configured using radio resource control (RRC) signalling. Each resource set is linked with a report configuration, comprising one or more sub-configuration. Each sub-configuration contains a parameter (n 1 , n2) for single panel and (nl, n2, ng) for multi -panel to represent the number of ports corresponding to the adaptation pattern, where nl and n2 represents the antenna elements in horizontal and vertical directions, respectively, in an antenna panel and ng represents the number of antenna panels. The CSI-RS resources within a resource set are linked to all sub configurations of the report configuration. Therefore, a resource transmitted using an adaptation pattern is linked to a sub configuration corresponding to the same pattern or different pattern. In case of different patterns, the sub configuration should indicate the method to select the pattern corresponding to the sub configuration, for which, the sub configuration contains a bitmap indicating the subset of ports.

[0044] FIG. 3 is a diagram depicting Type 2 spatial adaptation in accordance with an embodiment of the present disclosure. For type 2 spatial adaptation, a UE is configured with one or more CSI-RS resources within a CSI-RS resources set, where all resources within a resource set are transmitted using an adaptation pattern (e.g., 32 ports) configured using RRC. Each resource set is linked with a report configuration, comprising one or more subconfigurations, where each sub configuration corresponds to a different adaptation pattern (e.g., number of TXRUs). Each CSI-RS resource within a resource set, is linked with only one sub-configuration, whereas one sub-configuration is associated with one or more CSI-RS resources. The CSI-RS resources associated with a sub configuration is transmitted based on the adaptation pattern associated with the sub configuration (e.g., transmitted with the number of TXRUs associated with sub configuration) but the number of ports configured for the resource remains the same. Since UE has notion of only number of ports, the number of TXRUs for transmission of the resources is transparent to the UE. An e.g., for the structure is illustrated in Fig. 2 below.

[0045] The CSI reporting can be periodic, semi-persistent or aperiodic. In the case of periodic reporting, the UE reports the measured parameters at regular intervals based on configuration. If periodic report configuration is associated with L sub configurations, then the UE reports parameters corresponding to all L sub configurations periodically. However, for semi-persistent and aperiodic CSI reporting the UE is triggered using medium accesscontrol-control element (MAC-CE) and / or downlink control information (DCI) and the trigger will indicate the sub configurations to send the report. E.g., in Fig. 1, if the CSI-report configuration is aperiodic, then the DCI triggering the report configuration indicates UE to report parameters corresponding to sub configuration 2 alone.

[0046] There are several report quantities or parameters of the channel defined in NR such as channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), layer indicator (LI) etc. For a CSI report, the quantities or parameters to be reported are configured along with the report configuration and is common for all the sub configurations linked to the report configuration, i.e., for each sub configuration the UE needs to report all the parameters associated with the report configuration. E.g., in Fig. 1, if the report configuration indicates CQI, PMI, RI and LI as reporting quantities, and if both sub configurations are triggered then the UE must report (CQI, PMI, RI and LI) for both sub configuration 1 and sub configuration 2. Therefore, reporting all parameters for all sub configurations associated with a report configuration increases the UL payload significantly. Further, the value of the parameter may not change significantly across the sub configurations. Hence, the value of the parameter can be redundant across the sub configurations.

[0047] Embodiments of the invention herein generally describe techniques for CSI feedback reduction in wireless communication that are not well-known, and further, are not taught or suggested by any known conventional methods or systems. The embodiments of the disclosure described herein includes provide techniques to reduce the number of CSI reports, reported for multiple spatial and / or power adaptations, based on various report quantities of the CSI and the correlation between them to reduce the uplink overhead of the UE that previously existed. The description herein further describes some embodiments propose various methods to report differential values of CSI report quantities in wireless communication and further discusses methods to reduce CSI reporting payload.ENHANCEMENT IN CQI REPORTING

[0048] A channel quality indicator (CQI) is an estimate of channel quality reported by the UE to the BS for link adaptation. In NR, a CQI is configured as one of wideband or sub band CQI. The sub-band CQI is used for frequency selective scheduling of UE in a best suitedsub-band, whereas reporting of wideband CQIs is needed for an estimation of channel across the full bandwidth and for better reporting of the CSI. The wideband CQI is reported using an absolute CQI value of 4 bits and the sub-band CQI is reported by a vector. The size of the vector depends on the number of subbands. Each element of the vector is of 2 bits representing a differential CQI value for a corresponding sub-band with respect to wideband. For spatial adaptation, UE may need to report CSI for the whole bandwidth so that the BS gets an estimate of the overall channel quality and determine the adaptation pattern. Hence, a wideband CQI indicating an average channel quality over the complete bandwidth is beneficial for determining the spatial adaptation pattern. This will avoid the transmission of a CQI vector thereby reducing UL overhead. When a UE reports the wideband CQI for multiple sub configurations, a large number of bits (4 bits per sub configuration) is needed. To reduce the UL overhead the UE reports a differential wideband CQI for a sub configuration instead of reporting the full wideband CQI. The differential CQI is taken as the difference between the CQI of a sub-configuration and the CQI of a reference sub configuration. Following methods can be considered for defining the reference subconfiguration:• In one method, the reference sub-configuration is defined as a sub-configuration configured with maximum / minimum number of ports or TXRUs. E.g., Fig. 1, subconfiguration 1 is the reference sub-configuration in case of maximum number of ports. The UE measures CQI corresponding to sub-configuration 1 and subconfiguration 2 as CQI1 and CQI2, respectively, and reports (CQI1, CQI1-CQI2) to the gNB.• In another method, the reference sub -configuration is defined as a sub-configuration with the same number of ports or TXRUs as that of the linked resource set. E.g., in Fig. 1, the sub-configuration 1 and the resources within the linked resource set corresponds to 16 ports. Hence, sub-configuration 1 is the reference subconfiguration.• In yet another method the reference sub-configuration is indicated by the BS in RRC configuration for sub-configuration or in trigger signal for reporting. The indication uses the index of the sub-configuration or number of ports / TXRUs associated withthe sub-configuration. The index of a CSI-RS associated with the reference subconfiguration is indicated by the BS for Type 2 adaptation.• In yet another method, the reference sub-configuration is a sub -configuration corresponding to maximum value of calculated CQI. The UE reports the index of the reference sub-configuration along with the CQI value so that BS can identify the index of the reference sub-configuration.• In yet another method the BS identifies the reference sub-configuration based on the position of its associated CQI(or CSI) mapped in the joint report. The mapping of CSI report quantities for multiple sub-configurations is defined such as, the CQI( or CSI) for the reference sub -configuration is always mapped first than the remaining CQIs(or CSIs) in a concatenated way.• In yet another method, the reference sub configuration is taken as a sub configuration with lowest or highest index, when the sub configurations are indexed in a sequential manner by RRC configuration.

[0049] For reporting differential CQI, a new CQI table with possible set of values for the differential CQIs can also be defined. The length of the table depends on the maximum size of differential CQI and accuracy of the CQI. For e.g., if the maximum difference between CQIs is 7, then the table contains 8 rows, and 3 bits are needed in the report for indicating row index of the calculated differential CQI. The values for the differential CQIs is also defined as a range, where each row of the table corresponds to the range to which the differential CQI belongs. Further, the BS can set a limit on the number of CQIs reported using the table. In other words, the BS implicitly indicates the UE to report CQI corresponding to a subset of configured sub-configurations. E.g., a UE is configured with a table with maximum differential CQI value of 3 dB and enabled with reference sub -configuration as a sub-configuration with the maximum calculated CQI. If the CQI values calculated by UE for 5 sub-configurations configured are (23, 21, 14, 18, 16) then the UE will report only CQI values 23 and 21. In general, the differential CQI is sent with lower number of bits than the wideband full CQI of 4 bits. For e.g., in Fig. 1, the conventional method requires 8 bits for CQI (4 bits per sub-configuration). However, using the differential method, the UE reportCQI for reference sub-configuration using 4 bits and differential CQI for other subconfigurations using less than 4 bits.

[0050] To reduce the number of bits needed to represent the differential CQI and to reduce UL overhead further, following methods are considered:• In another method, the differential CQI can also be reported by taking the sequential difference between the CQIs of two consecutive sub-configurations when the configured sub-configurations are indexed in a sequential manner i.e. the UE will take the CQI difference of a particular sub-configuration w.r.t the CQI of previous subconfiguration instead of difference with the reference sub-configuration, .where the CQI for the reference sub-configuration is reported as full CQI. For e.g., if the CQIs of 3 sub-configurations i.e. sub-configuration 1, sub-configuration 2, and subconfiguration 3 are 10, 12, and 8 respectively, then the differential CQI for subconfiguration 2 as the sequential difference will be 10-12 = -2. Similarly, the differential CQI for sub-configuration 3 will be 12-8=4. So, the UE will report the CQIs as [10, -2, 4] instead of [10,12,8].• In a yet another method, the CQI for a sub-configuration can be reported as the difference between its differential CQI with the differential CQI of its previous subconfiguration when the configured sub-configurations are indexed in a sequential manner. The differential CQI for a particular sub-configuration is taken as the difference between its CQI and the CQI of reference sub-configuration. In a report, the CQI of reference sub-configuration is reported as it is, the CQI of second indexed sub-configuration is reported as the differential CQI and the CQI of remaining subconfigurations is reported as the difference between the differential CQIs. For e.g., if the CQIs of 3 sub-configurations i.e. sub -configuration 1, sub-configuration 2, and sub-configuration 3 are 10, 12, and 14 respectively, with sub-configuration 1 as the reference sub-configuration. Then the differential CQI for sub-configuration 2 with respect to CQI of sub-configuration 1 will be 10-12 = -2. Similarly, the differential CQI for sub configuration 3 will be 10-14=-4. Then the difference between 2 consecutive differential CQIs is calculated for sub-configuration 3 as (-2) - (-4) = 2. So, the UE will report the CQIs as [10, -2, 2] instead of [10,12,14].

[0051] The indication of the CQI as the direct difference between the CQIs of two subconfigurations will still require a lot of bits, especially when the number of sub-configurations is high. Hence further reduction of bits used for differential CQI is beneficial. In NR, a UE reports a CQI based on the measured DL signal to noise plus interference ration (SINR). There are 15 possible CQI values defined in NR which are 2 dB apart from each other. The UE measure SINR using the reference signal, determine the actual CQI value based on SINR, maps the actual CQI value to the closest lower / higher value of CQI defined in NR, determine row index of the mapped CQI in the configured CQI table and report the row index to the gNB. The DL SINR is directly proportional to the number of spatial antenna elements such as number of ports or number of TXRUs, since the number of spatial elements affects the antenna gain. Hence, for type 1 and type 2 spatial adaptations, when the number of spatial elements reduce the SINR will also reduce in a similar proportion, and vice versa. Further, similar change will happen in CQI as well. Based on this observation following is proposed to reduce the CSI reporting overhead• In a method, a BS can estimate the value for SINR and corresponding CQI for a subconfiguration or adaptation pattern based on number of spatial elements associated with sub-configuration, the number of spatial elements associated with reference subconfiguration and the SINR or CQI value corresponding to the reference subconfiguration. Therefore, the UE need to send only CQI or SINR corresponding to the reference sub-configuration to the gNB. E.g., in Fig. 1, if sub-configuration 1 is the reference sub-configuration, then UE measures SINR1, calculates CQH and reports CQI1. Here, SINR1 and CQH are SINR and CQI corresponding to sub-configuration 1. Since, sub-configuration 1 configured as 16 ports and sub -configuration 2 for 8 ports, the SINR2, corresponding to sub-configuration 2, is approximately half of the SINR1. Therefore, the BS receives CQH from UE, calculates the SINR1 based on CQI1, determine SNR2 as half of SINR1 and determines the CQI2 based on SINR2.

[0052] The estimated value of SINR based on the ratio of the number of spatial elements in the sub-configuration and the reference sub -configuration is an approximate value. Hence, the actual value of SINR, calculated based on RS measurements, may differ from the estimated value. If the difference between estimated value and actual value is high enough to cause variation in the CQI (e.g., cause 2 dB difference in CQI value or change of row in CQItable in NR), then it impacts the selection of MCS and affects the link adaptation by gNB. To overcome this issue following methods are proposed:• In a method, the UE reports a full CQI corresponding to the reference sub- configuration and the BS determines the CQIs for other sub -configurations based on the changes in the number of spatial elements and the reported CQI. The BS then selects one of the sub -configuration for spatial adaptation based on the determined CQIs and transmits the PDSCH with the adapted spatial pattern. If the PDSCH data packet fails with the adapted spatial pattern, then the BS re-estimates the required CQI for the data transmissions. The BS perform outer loop correction to re-estimate the CQI for the adapted spatial pattern. In outer loop correction, the BS adjusts the estimated SINR continuously based on the HARQ feedbacks of PDSCH transmissions to achieve the target BLER. The adjustment in the SINR can be a positive or a negative adjustment with a fixed offset depending on HARQ ACK or NACK. Once an appropriate SINR is achieved to meet the target BLER requirement, the BS can determine the optimal value of the CQI based on the re-estimated SINR. If the optimal value of CQI maps with any of the CQIs corresponding to different sub-configuration, the BS adapts to a spatial adaptation with the number of spatial elements associated with the sub configuration. The drawback of this process is large delay of the order of seconds to determine the optimal value of CQI. This delay can make the value of reported CQI of the reference sub-configuration outdated and may degrade the performance of the spatial adaptation.• In another method, the UE reports complete CQI corresponding to reference subconfiguration and an offset value for other sub-configurations, where the offset value is the difference between actual SINR value computed based on RS measurement and the SINR value estimated using the ratio of the number of spatial elements configured for the sub-configuration and the reference sub-configuration. E.g., in Fig. 1, if subconfiguration 1 is the reference sub-configuration, then UE measures SINR1 and actual SINR2, calculates CQI1 using SINR1 and CQI table, estimates SINR2 as half of SINR1 and reports CQH and an offset. Here, offset is the difference between measured value of SINR2 and estimated value of SINR2.• The BS receives CQI corresponding to reference sub-configuration and the offset, computes SINR for reference sub-configuration using the received CQI value and CQI table, estimates SINR of other sub-configuration using SINR for reference subconfiguration and ratio of spatial elements associated with the sub-configurations, calculates actual SINR of other sub -configuration using estimated SINR and the offset and determine CQI for other sub-configuration using actual SINR value calculated. For the e.g., in Fig. 1, the BS receives CQI1 and an offset, determine SINR1 using CQI1, estimate SINR2 as half of SINR1, calculate actual SINR2 by adding estimated SINR2 and the offset, and determine CQI2 based on actual SINR2.• In another method, the UE reports complete CQI corresponding to reference subconfiguration and an offset value for other sub-configurations, where the offset value is the difference between actual CQI value computed based on RS measurement and the CQI value based on an SINR estimated using the ratio of the number of spatial elements configured for the sub -configuration and the reference sub-configuration. E.g., in Fig. 1, if sub-configuration 1 is the reference sub-configuration, then UE measures SINR1 and actual SINR2, calculates CQI1 & actual CQI2 using SINR1 and actual SINR2 respectively, determines CQI2 based on SINR2 estimated as half of SINR1 and reports CQI1 and an offset. Here, offset is the difference between actual CQI2 based on measured value of SINR2 and CQI2 based on estimated value of SINR2.• The BS receives CQI corresponding to reference sub -configuration and the offset, computes SINR for reference sub-configuration using the received CQI value and CQI table, estimates SINR of other sub-configuration using SINR for reference subconfiguration and ratio of spatial elements associated with the sub-configurations, estimates CQI of other the sub-configuration using estimated SINR and determine actual CQI for the other sub -configuration using estimated CQI value and the offset. For the e.g., in Fig. 1, the BS receives CQI1 and an offset, determine SINR1 using CQI1, estimate SINR2 as half of SINR1, determines CQI2 based on estimated SINR2 and calculate actual CQI2 by adding estimated CQI2 and the offset.

[0053] In a method, a two-bit indication to represent the difference between the estimated and actual CQIs with respect to the spatial adaptation should be reported by the UE. Even the assumed DL SINR and measured DL SINR may not deviate much, the estimated CQI can be either the next lower or next higher CQI value of the actual CQI with 2 dB difference. Thus the 2-bit indication is used to represent the positive change, negative change and no change between the estimated and actual CQIs. But, when a link is suitable for a higher MCS, it can also work with lower MCS values, hence the difference between the estimated CQI and actual CQI can be further grouped in 2 groups. The positive change and no change between the estimated and actual CQIs can be grouped in to one group and the negative change is included in another group. Thus in another method, the indication is a one-bit indication to represents a positive change when enabled and a negative change when disabled.TWO STEP CSI REPORTING

[0054] A UE can be configured with a number of sub-configurations. For periodic CSI report, the UE transmits CSI report for all the configured sub-configurations. However, for aperiodic and semi periodic CSI report, the BS triggers a subset of configured subconfigurations to be reported. In either case, the UE requires to report CSI feedback for a number of sub-configurations, which increases resources consumption in UL and power consumption at the UE. Thus, a mechanism for optimization of CSI report will help in reduction of UL power consumption at the UE.

[0055] In one method, the UE will report only partial CSI report instead of full CSI for each sub-configuration in first step. The partial CSI may contain only a subset of the report quantities configured to the UE. Currently a CSI report may be a 2-part CSI based on the configured report quantities. The part 1 CSI contains report quantities such as CRI, CQI and RI if configured and Part 2 contains quantities such as PMI, LI if configured. Hence, in an e.g., the partial CSI report may contain only part 1 CSI of the reports for all the subconfigurations. Then the BS selects a subset of sub -configuration having at least one subconfiguration with best suited adaptations from the indicated partial CSI reports based on network conditions. A trigger can be indicated to the UE to report the complete CSI of the selected sub-configurations as a second step. The trigger is indicated in MAC-CE or DCI to the UE.

[0056] In another method, the BS transmits a 1-bit parameter to the UE to report only part 1 CSIs for all sub configurations as a first step. The one -bit parameter is either configured in RRC or given in MAC-CE or DCI to the UE. The BS will select at least one subconfiguration with best suited adaptations from the reported parti CSI reports based on network conditions. A trigger is indicated to the UE to report the complete CSI or part 2 CSIs of the selected sub-configurations as a second step.

[0057] In yet another method, the BS indicates a parameter in RRC or MAC-CE to the UE to select between Part 1 CSIs, full CSI (including parti and part2), and different subsets of report quantities to report for all sub-configurations in first step. The different subsets of report quantities is either indicated by the BS or defined in the standards. For e.g., an RRC parameter “PartialCSIReport = enum{partl, full, CRI-CQI, CRI-CQI-PMI] can be defined in standards and one of the options is selected in RRC configuration such as CRI-CQI. Then the UE will only report the values of CQIs and CRIs for all sub-configurations in the first step. The BS will then select some of the sub-configurations based on the reported information in first step and trigger the UE to report the remaining report quantities of the selected sub-configurations in second step.

[0058] In yet another method, the UE reports the indices of the sub-configurations with best suited spatial adaptation instead of sending the CSI reports for the sub -configurations. Then the BS selects a subset of sub-configuration from the indicated indices based on network conditions such as traffic requirements etc. and triggers the UE to report the corresponding CSI. The sub-configuration indices are configured to the UE for e.g. in ascending order. The UE reports the indices of best suited sub-configurations in form of a bitmap. The length of the bitmap can be equal to the total number of sub-configurations configured to the UE. The mapping between indices and bitmap can be predefined or preconfigured. E.g. the MSB of bitmap may indicate the lowest indices and LSB may indicate the highest indices. The UE also reports values for a subset of configured CSI report quantities for a reference subconfiguration along with the bitmap to assist the BS in determining the subset of subconfiguration for complete CSI reporting in second step.UE SELECTION OF CSI REPORTING

[0059] CSI report configurations containing a number of sub-configurations require a UE to report multiple CSI feedback. The number of CSI feedback can be reduced up to an extent by the BS indicating a subset of sub configurations to be reported for aperiodic / semi periodic CSI reports. However, for periodic CSI reports, there is no such indication. The CSI payload is reduced if the selection of sub configurations to be reported is also allowed at UE side. Currently, for type 1 spatial adaptations, a sub configuration contains a parameter to represent number of ports and a parameter to represent which subset of ports to be used for the CSI feedback. This may imply that there can be multiple sub-configurations with the same number of ports but with different subset of ports. In this case, the UE report for only those sub-configurations whose CSI measurements are better than a threshold from all subconfigurations with the same number of ports. The UE discards the reporting for remaining sub-configurations. The threshold is configured by the BS or predefined. The value of threshold represents either a cut-off value for a specific CSI report quantity such as CQI or a specific number of sub-configurations with better measurements than others e.g. best 2 subconfigurations. In yet another method, a UE can report for only the sub -configurations with lowest spatial adaptation pattern which crosses the threshold. Thus, reporting only for the sub-configurations with best CSI measurements will reduce the total UL overhead and UL power consumption at the UE.SEGREGATION OF CSI REPORT QUANTITIES AS COMMON OR INDIVIDUAL

[0060] A CSI- RS report configuration has different types of report quantities to report for e.g. RI, PMI and CQI etc. For a report configuration with multiple CSI report subconfigurations, same report quantities are to be reported individually for each subconfigurations. Then, there can be redundancy among the report quantities for multiple subconfigurations, this will increase the payload size in CSI feedback thereby increasing the UL resource and power consumption at UE. Hence, to reduce the CSI payload, the report quantities can be segregated into 2 categories of common and individual report quantities. The report quantities with very low variance in their values across one or more sub configurations is considered as common in category 1. A single value will be reported for the common report quantities. The report quantities with comparatively high variance in their values corresponding to various sub-configurations will be considered as individual report quantities in category 2 and their individual values will be reported for each sub-configurations. The following methods will help in determining the category of the report quantities.

[0061] FIG. 4 is a diagram depicting grouping of common and individual CSI report quantities in accordance with an embodiment of the present disclosure. In one method, the UE configured with a report config with multiple sub-configurations group the report quantities into two groups i.e. group 1 and group 2. The group 1 contains common report quantities as category 1 and group 2 contains the individual report quantities as category 2 to report. The UE measures and determines the report quantities having very low variance in their values across all sub-configurations as common and include them in group 1. For a report quantity in group 1, a single average value or a highest value can be reported for all sub configurations (e.g., with different number of ports). Whereas the report quantities with comparatively high variance in their measured values corresponding to various subconfigurations will be reported as individual values in group 2. A bitmap is indicated by the UE to the BS along with the CSI report to segregate between common and individual report quantities. The size of the bitmap will depend on the configured report quantities to report in the report configuration. For e.g., with 5 different type of report quantities such as cri-RI-LI- PMI-CQI configured in report config with 3 sub-configurations, a bitmap of 5 bits can be indicated by the UE, where 1st, 2nd, 3rd 4th & 5th bits of the bitmap represent the quantities CRI, RI, LI, PMI and CQI respectively. The value 1 (set) of a bit in the bitmap indicates that corresponding report quantity has individual values reported and 0 (reset) indicates common value for all sub-configurations. In above e.g., a bitmap 10011 represents that the parameter RI & LI are having a common value, then the report for 3 sub-configurations may look as given in Fig 4.

[0062] In another method, the BS segregates the category (i.e. common or individual) for each of the configured report quantities individually using a bitmap indication. The bitmap can be indicated using RRC, MAC-CE or DCI to the UE. Each bit of the bitmap will indicate the category of only one CSI report quantity. The length of the bitmap is based on the number of configured report quantities. For e.g., with 3 different type of report quantities configured in a report config such as CRI-CQI-RI, a bitmap of 3-bits is indicated by the gNB, where 1st, 2nd, & 3rd bits of the bitmap represent the quantities CRI, CQI, & RI respectively. The value 1 (set) of a bit in the bitmap indicates that corresponding report quantity has individual values reported and 0 (reset) indicates common value for all sub-configurations.

[0063] In yet another method, the BS will configure the report quantities in different categories as either common report quantities or individual report quantities separately. Here, the report quantities will be configured in two groups as common or individual by the gNB. An RRC parameter is used to represent some of the quantities as common such as “CommonReportQuantities = {CQI-PMI}” and an another RRC parameter is used to represent the remaining quantities to be configured as individual such as “IndividualReportQuantities = {RI- LI The configuration of common or individual report quantities is given as either per report configuration or per sub-configuration. If the configuration is given per report configuration, then the same will hold for all sub- configurations within the report configuration as shown in Fig. 3, where the report quantities configured as common will be treated as common report quantities for all sub-configurations and a single value will be reported for all sub-configurations. Similarly, the report quantities configured as individual will be reported separately / individually for each of the subconfigurations. Otherwise, report quantities will be configured separately as common or individual for each of the sub-configurations.

[0064] In a yet another method, the segregation of certain report quantities is determined based on an indication by the gNB. The BS will indicate a parameter in RRC, MAC-CE or in the DCI triggering the report, to represent the segregation of the report quantities as common or individual. The indication parameter is used by the UE to select between reporting of a common value or individual values for all the associated report quantities. A one -bit parameter is used as the indication parameter and when enabled, the associated quantity should be reported as a common value, otherwise individual values will be reported for all configurations. The association between the report quantities with the indication parameter can be either preconfigured or defined in standards. If there are more than one report quantities associated with the indication, then each of the associated quantities will be treated as common or individual based on the indication. For e.g. if 2 report quantities RI, & PMI are associated with the indication parameter and the association is defined in the standards. Then, whenever the indication parameter is given as enabled, the UE will report only a common value for all RIs and a common value for all PMIs for all sub-configurations. The indication is given in MAC-CE as a 0 bit parameter with an LCID allotted in standards. The UE upon receiving the parameter with the allotted LCID in the MAC-CE will report only the common value for each of the associated report quantities. In another method, the indication parameteris given in the form of an enum in RRC. For e.g., an optional parameter “CategoryofReportQuantities = enumjcommon, individual}” can be defined in standards and one of the 2 options is selected in RRC configuration. If there is no association between the indication parameter and report quantities are defined in standards or configured to the UE, then the indication can be either applicable to all the report quantities configured in the report configuration or discarded by the UE. Similarly, if no indication is received by the UE, it will report individual values for all the report quantities for all sub-configurations.

[0065] In yet another method, some of the report quantities is defined as common report quantities in the standards. The UE when configured with any of these report quantities will implicitly determine to report only one common value for each of the report quantities defined as common for all sub-configurations.

[0066] FIG. 5 is a diagram depicting grouping of sub-configurations for segregation of CSI report quantities in accordance with an embodiment of the present disclosure. In yet another method, the sub-configurations is grouped in a number of groups with at least one sub-configuration per group for the segregation of report quantities. The category of one or more report quantities as common or individual report quantities is provided separately for each group of the sub-configurations using any of the above-mentioned options. This will allow some flexibility in the CSI reporting for multiple sub-configurations, for a case where some of the report quantities have low variance in their values for only a sub set of the total sub configurations while having high variance across the other sub-configurations. Hence a common value for those report quantities is reported only for the subset of the subconfigurations while individual values for the same report quantities is reported for all remaining sub-configurations. For e.g., for a report config with 4 sub configurations having 5 report quantities cri-RI-LI-PMI-CQI, the sub-configurations is grouped into 2 groups with sub-configurations 1 & 2 in group A and sub-configurations 3 & 4 in group B. The common report quantities for group A is configured such as RI whereas common report quantities for group B is configured separately such as LI & RI. Then the report may look as given in figure 5.

[0067] The grouping of the sub-configurations is determined by the BS based on their associated number of spatial elements. New parameters are introduced to indicate the grouping to the UE in RRC, MAC-CE or DCI. In a way, a new parameter can be configuredper report configuration in RRC to group the sub-configurations, for e.g., a bitmap is used in RRC to group the sub-configurations into 2 groups i.e. group A and group B, where each bit of the bitmap corresponds to an specific index of a sub-configuration configured. The value 1 (set) of a bit in the bitmap indicates that corresponding sub -configuration is associated with group A and 0 (reset) indicates sub -configuration is associated with group B. In another way, a new parameter is configured per sub-configuration to associate the corresponding subconfiguration with a particular group. For e.g., if sub-configurations are to be grouped into 4 groups, a 2 bit parameter is introduced in each sub -configuration to associate it with one of the 4 groups. The value 00 of the parameter indicates that corresponding sub-configuration is associated with first group, value 01 indicates sub-configuration is associated with second group and so on. In another way, the grouping of sub-configurations is predefined in standards.

[0068] Fig. 6 illustrates a block diagram depicting the components of a wireless communication system 600 in accordance with an embodiment of the present disclosure. As shown in FIG. 6, the UE 602 may comprise a processor 614, memory storing instructions 612 and a transceiver circuitry comprising a transmitter 616 and receiver 618 configured to perform the methods herein. As shown in FIG. 6, the BS 604 may comprise a processor 624, memory storing instructions 622 and a transceiver circuitry comprising a transmitter 626 and receiver 628 configured to perform the methods herein.

[0069] FIG. 6 in accordance with an embodiment of the present disclosure illustrates only one memory and processor. It is apparent to a skilled person in the art that a UE and BS may include one or more processors and one or more memories. The memory may also be referred to as a storage medium, a storage device, or the like. The memory may be disposed independent of the processor, or may be integrated with the processor. This is not to be accorded as a limitation of the embodiment described in this disclosure.

[0070] 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 transceiverunit 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.

[0071] 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.

[0072] All or some of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, all or some of the embodiments may be implemented in a form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions according to embodiments of this application are all or partially generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or another programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or may be transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired (for example, a coaxial cable, an optical fiber, or a digital subscriber line (DSL)) or wireless (for example, infrared, radio, or microwave) manner. The computer-readable storage medium may be any usable medium accessible by the computer, or a data storage device, for example, a server or a data center, integrating one or more usable media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid-state drive (SSD)), or the like.

[0073] FIG. 7 illustrates a method of reporting Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure. The operations of method 700 presented below are intended to be illustrative. In someimplementations, method 700 may be accomplished with one or more additional operations not described, and / or without one or more of the operations discussed. Additionally, the order in which the operations of method 700 are illustrated in FIG. 7 and described below is not intended to be limiting.

[0074] Step 702 may include receiving by at least one node, at least one first configuration, for measuring at least one CSI report quantity.

[0075] Step 704 may include receiving by the at least one node, at least one reference signal based on the at least one first configuration.

[0076] Step 706 may include measuring by the at least one node, at least one CSI report quantity using the at least one reference signal.

[0077] Step 708 may include determining a first value of at least one CSI report quantity for a second configuration chosen from the at least one first configuration.

[0078] Step 710 may include determining at least one offset associated with the at least one CSI report quantity of at least one third configuration.

[0079] In an embodiment, the second configuration is the configuration having at least one of: maximum number of ports, maximum number of transmit and receive units (TXRUs), wherein the TXRUs comprise one or more of physical antennas, radio units, or spatial elements used for signal transmission and reception, same number of ports or same number of TXRUs as that of a linked resource set, wherein the linked resource set corresponds to the at least one resource for CSI measurements, maximum value of the at least one CSI report quantity, lowest or highest index, when the at least one first configuration are indexed in a sequential manner using the RRC configuration, and its associated at least one CSI report quantity mapped in a specific position in the UL resources containing the at least one CSI report.

[0080] In an embodiment, the second configuration is indicated in one of Radio ResourceConfiguration (RRC) configuration and a trigger signal for reporting at least one CSI quantity.

[0081] In an embodiment, the at least one third configuration comprises at least one configuration chosen from the at least one first configuration.

[0082] In an embodiment, the at least one offset is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration.

[0083] In an embodiment, the at least one first configuration comprises at least one of: at least one resource configuration, at least one sub-configuration, and at least one report configuration.

[0084] In an embodiment, the at least one resource configuration comprises at least one resource for CSI measurement.

[0085] In an embodiment, the at least one report configuration comprises information of the reference signal, at least one CSI report quantity to be reported and scheduling information for transmitting the at least one CSI report quantity.

[0086] In an embodiment, the at least one offset is a difference between the values of at least one CSI report quantity of two successive configurations.

[0087] In an embodiment, the at least one offset is the difference between the values of a differential report quantity of two successive configurations, wherein the differential report quantity is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration and wherein one of the two successive configurations is the latest configuration.

[0088] In an embodiment, the at least one CSI report quantity comprises at least one of: Channel Quality Indicator (CQI), Channel Rank Indicator (CRI), Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), Precoding Matrix Indicator (PMI), Layer indicator (LI), Rank Indicator (RI) and Signal-to-Interference-plus-Noise Ratio (SINR).

[0089] In an embodiment, the first value is used to estimate the value for SINR and corresponding CQI for the at least one third configuration based on number of spatialelements associated with the at least one third configuration, number of spatial elements associated with the second configuration and one of the SINR and CQI value corresponding to the second configuration, wherein the first value is one of CQI and SINR.

[0090] In an embodiment, the at least one offset is the difference between actual SINR value computed based on the reference signal measurement and the SINR value estimated using ratio of number of spatial elements associated with the second configuration and the at least one third configuration.

[0091] In an embodiment, the at least one offset value is the difference between actual CQI value computed based on the reference signal measurement and the CQI value based on the SINR estimated using the ratio of the number of spatial elements configured for the second configuration and the at least one third configuration.

[0092] In an embodiment, reporting by the at least one node, comprises, at least one of: the first value, the at least one offset, a subset of at least one CSI report quantity, and an indication of an at least one fourth configuration, wherein the at least one fourth configuration is a subset of the at least one first configuration.

[0093] In an embodiment, the at least one offset is indicated using at least one bit.

[0094] In an embodiment, the indication is one of a positive change and a negative change, when the at least one bit consists of only 1 bit, wherein the 1 bit indicates one of enabled and disabled, and a positive change, no change and a negative change, when the at least one bit comprises of only 2 bits.

[0095] In an embodiment, receiving by the at least one node, comprises, an indication of at least one fifth configuration, wherein the at least one fifth configuration is a subset of the at least one fourth configuration, and receiving by the at least one node, a trigger to report the remaining quantities from the at least one CSI report quantity for the at least one fifth configuration.

[0096] In an embodiment, the trigger is a 1 -bit parameter.

[0097] In an embodiment, the subset of at least one CSI report quantity is identified by the at least one node, by an indication received in one of Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

[0098] In an embodiment, the subset of the at least one CSI report quantity comprises at least one of: Part 1 CSI measurements; and Part 2 CSI measurements.

[0099] In an embodiment, the index of the at least one first configuration is preconfigured.

[0100] In an embodiment, the at least one node report the indices of the at least one fourth configuration in form of a bitmap.

[0101] In an embodiment, the length of the bitmap is equal to the number of the at least one first configuration.

[0102] In an embodiment, the mapping between indices and bitmap is one of predefined and configured.

[0103] In an embodiment, the at least one node reports the subset of at least one CSI report quantity that exceeds at least one threshold.

[0104] In an embodiment, the at least one node reports the subset of at least one CSI report quantity for the at least one fourth configuration.

[0105] In an embodiment, the at least one fourth configuration is associated with the lowest spatial adaptation pattern.

[0106] In an embodiment, the at least one fourth configuration is the configuration is from a set of the at least one first configuration wherein the set is associated with one of same number of ports or same number of TXRUs.

[0107] In an embodiment, the at least one threshold is one of configured and predefined.

[0108] In an embodiment, the at least one threshold represents one of a cut-off value for the at least one CSI report quantity or the size of the subset of the at least one first configuration with better measurements.

[0109] In an embodiment, the at least one node comprises one of a base station, a gNB, relay, a repeater, an integrated access and backhaul (IAB) -Distributed Units (DU), user equipment (UE), and IAB -mobile termination (MT).

[0110] FIG. 8 illustrates a method of reporting Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure. The operations of method 800 presented below are intended to be illustrative. In some implementations, method 800 may be accomplished with one or more additional operations not described, and / or without one or more of the operations discussed. Additionally, the order in which the operations of method 800 are illustrated in FIG. 8 and described below is not intended to be limiting.

[0111] Step 802 may include receiving by at least one node, at least one report configuration for CSI reporting, wherein the at least one report configuration comprises at least one of at least one CSI report quantity and at least one sub -configuration.

[0112] Step 804 may include measuring by at least one node, at least one CSI report quantity for the at least one sub-configurations.

[0113] Step 806 may include categorizing by at least one node, the at least one CSI report quantity of at least one sub-configurations into two groups.

[0114] Step 808 may include reporting by the at least one node, the value of at least one CSI report quantity of at least one sub-configurations based on the categorization.

[0115] In an embodiment, the categorizing by the at least one node, comprises at least one of: grouping the at least one CSI report quantity having very low variance in their measured values for the at least one sub-configurations as common report quantity, and grouping the at least one CSI report quantity having very high variance in their measured values across the at least one sub-configurations as individual report quantity.

[0116] In an embodiment, the reporting by the at least one node, comprises at least one of: reporting one of a single average value and a highest value for the common report quantity, and reporting individual values for the individual report quantity.

[0117] In an embodiment, the at least one node report the categorization between common and individual report quantities in the CSI report in a form of a bitmap.

[0118] In an embodiment, the at least one node receives the categorization between common and individual report quantities in a form of the bitmap.

[0119] In an embodiment, the bitmap is received using Radio Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

[0120] In an embodiment, each bit of the bitmap indicate the category of the individual CSI report quantity of the at least one CSI report quantity.

[0121] In an embodiment, the length of the bitmap is equal to the size of the at least one CSI report quantity.

[0122] In an embodiment, the at least one node receives a configuration of the at least one CSI report quantity as at least one of a common and individual, wherein the configuration is applicable for one of the at least one report configuration or the at least one subconfiguration.

[0123] In an embodiment, categorizing by the at least one node, comprises: receiving by the at least one node, a parameter in one of RRC, MAC-CE and DCI, to represent the categorization of the at least one CSI report quantity as one of common and individual for the at least one sub-configuration, and selecting by the at least one node, reporting of one of the common value and the individual values for the at least one CSI report quantity of the at least one sub-configuration based on the parameter.

[0124] In an embodiment, the parameter is a one -bit value.

[0125] In an embodiment, the association between the at least one CSI report quantity with the parameter is one of preconfigured and defined in standards.

[0126] In an embodiment, the at least one CSI report quantity defined as common report quantity in the standards.

[0127] In an embodiment, the at least one sub -configuration is categorized into plurality of groups; wherein the plurality of groups comprises at least one sub-configuration per group.

[0128] In an embodiment, the at least one CSI report quantity is same and the category of the at least one CSI report quantity in the plurality of groups is one of same and different.

[0129] In an embodiment, the at least one node comprises one of a base station, a gNB, relay, a repeater, an integrated access and backhaul (IAB) -Distributed Units (DU), user equipment (UE), and IAB -mobile termination (MT).

[0130] FIG. 9 illustrates method of receiving Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure. The operations of method 900 presented below are intended to be illustrative. In some implementations, method 900 may be accomplished with one or more additional operations not described, and / or without one or more of the operations discussed. Additionally, the order in which the operations of method 900 are illustrated in FIG. 9 and described below is not intended to be limiting.

[0131] Step 902 may include transmitting by at least one node, at least one first configuration, for measuring at least one CSI report quantity.

[0132] Step 904 may include transmitting by the at least one node, at least one reference signal based on the at least one first configuration.

[0133] Step 906 may include receiving by the at least one node, at least one of: a first value of at least one CSI report quantity for a second configuration, and at least one offset associated with the at least one CSI report quantity of at least one third configuration.

[0134] In an embodiment, the second configuration is the configuration having at least one of: maximum number of ports, maximum number of transmit and receive units (TXRUs), wherein the TXRUs comprise one or more of physical antennas, radio units, or spatial elements used for signal transmission and reception, same number of ports or same number of TXRUs as that of a linked resource set, wherein the linked resource set corresponds to the at least one resource for CSI measurements, maximum value of the at least one CSI report quantity, lowest and highest index, when the at least one first configuration are indexed in a sequential manner using the RRC configuration, and its associated at least one CSI report quantity to be mapped in a specific position in the UL resources containing the at least one CSI report.

[0135] In an embodiment, the second configuration is transmitted in one of Radio Resource Configuration (RRC) configuration, MAC-CE, and a trigger signal for reporting at least one CSI quantity.

[0136] In an embodiment, the at least one third configuration comprises at least one configuration chosen from the at least one first configuration.

[0137] In an embodiment, the at least one offset is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration.

[0138] In an embodiment, the at least one first configuration comprises at least one of: at least one resource configuration, at least one sub-configuration, and at least one report configuration.

[0139] In an embodiment, the at least one resource configuration comprises at least one resource for CSI measurement.

[0140] In an embodiment, the at least one report configuration comprises information of the reference signal, at least one CSI report quantity to be reported and scheduling information for transmitting the at least one CSI report quantity.

[0141] In an embodiment, the at least one offset is a difference between the values of at least one CSI report quantity of two successive configurations.

[0142] In an embodiment, the at least one offset is the difference between the values of a differential report quantity of two successive configurations, wherein the differential report quantity is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration and wherein one of the two successive configurations is the latest configuration.

[0143] In an embodiment, the at least one CSI report quantity comprises at least one of: Channel Quality Indicator (CQI), Channel Rank Indicator (CRI), Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), Precoding Matrix Indicator (PMI), Layer indicator (LI), Rank Indicator (RI) and Signal-to-Interference-plus-Noise Ratio (SINR).

[0144] In an embodiment, the first value is used to estimate the value for SINR and corresponding CQI for the at least one third configuration based on number of spatial elements associated with the at least one third configuration, number of spatial elements associated with the second configuration and one of the SINR and CQI value corresponding to the second configuration, wherein the first value is one of CQI and SINR.

[0145] In an embodiment, the at least one offset is the difference between actual SINR value computed based on the reference signal measurement and the SINR value estimated using ratio of number of spatial elements associated with the second configuration and the at least one third configuration.

[0146] In an embodiment, the at least one offset is used to calculate at least one actual SINR of the at least one third configuration using estimated SINR and the offset, and determine, CQI for the at least one third configuration using calculated actual SINR value.

[0147] In an embodiment, the at least one offset value is the difference between actual CQI value computed based on the reference signal measurement and the CQI value based on the SINR estimated using the ratio of the number of spatial elements configured for the second configuration and the at least one third configuration.

[0148] In an embodiment, the at least one offset is used to calculate CQI for the at least one third configuration using estimated CQI value and the offset.

[0149] In an embodiment, receiving by the at least one node, comprises at least one of: a subset of at least one CSI report quantity, and an indication of at least one fourth configuration, wherein the fourth configuration is a subset of the at least one first configuration.

[0150] In an embodiment, the at least one offset is received using at least one bit.

[0151] In an embodiment, the indication is one of a positive change and a negative change, when the at least one bit consists of only 1 bit, wherein the 1 bit indicates one of enabled and disabled, and a positive change, no change and a negative change, when the at least one bit comprises of only 2 bits.

[0152] In an embodiment, transmitting by the at least one node, an indication of at least one fifth configuration, wherein the at least one fifth configuration is a subset of the at least one fourth configuration, and transmitting by the at least one node, a trigger to report the remaining quantities from the at least one CSI report quantity for the at least one fifth configuration.

[0153] In an embodiment, the trigger is a 1 -bit parameter.

[0154] In an embodiment, the subset of at least one CSI report quantity is indicated by the at least one node in one of: Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

[0155] In an embodiment, the subset of the at least one CSI report quantity comprising at least one of: Part 1 CSI measurements, and Part 2 CSI measurements.

[0156] In an embodiment, the index of the at least one first configuration is preconfigured.

[0157] In an embodiment, the at least one node receives the indices of the at least one fourth configuration in form of a bitmap.

[0158] In an embodiment, the length of the bitmap is equal to the number of the at least one first configuration.

[0159] In an embodiment, the mapping between indices and bitmap is one of predefined and configured.

[0160] In an embodiment, the at least one node receives the subset of at least one CSI report quantity that exceeds at least one threshold.

[0161] In an embodiment, the at least one node receives the subset of at least one CSI report quantity for the at least one fourth configuration.

[0162] In an embodiment, the at least one fourth configuration is associated with the lowest spatial adaptation pattern.

[0163] In an embodiment, the at least one fourth configuration is the configuration chosen from a set of the at least one first configuration wherein the set is associated with one of same number of ports or same number of TXRUs.

[0164] In an embodiment, the at least one threshold is one of configured and predefined.

[0165] In an embodiment, the at least one threshold represents one of a cut-off value for the at least one CSI report quantity or the size of the subset of the at least one first configuration with better measurements.

[0166] In an embodiment, the at least one node comprises one of a base station, a gNB, relay, a repeater, an integrated access and backhaul (IAB) -Distributed Units (DU), user equipment (UE), and IAB -mobile termination (MT).

[0167] FIG. 10 illustrates a method of receiving Channel State Information (CSI) in a wireless communication system in accordance with an embodiment of the present disclosure. The operations of method 1000 presented below are intended to be illustrative. In someimplementations, method 1000 may be accomplished with one or more additional operations not described, and / or without one or more of the operations discussed. Additionally, the order in which the operations of method 1000 are illustrated in FIG. 10 and described below is not intended to be limiting.

[0168] Step 1002 may include transmitting by at least one node, at least one report configuration for CSI reporting, wherein the at least one report configuration comprises at least one of at least one CSI report quantity and at least one sub -configuration.

[0169] Step 1004 may include receiving by the at least one node, the value of at least one CSI report quantity of at least one sub-configurations based on a categorization.

[0170] In an embodiment, the categorization comprises at least one of: grouping the at least one CSI report quantity having very low variance in their values for the at least one subconfigurations as common report quantity, and grouping the at least one CSI report quantity having very high variance in their values across the at least one sub -configurations as individual report quantity.

[0171] In an embodiment, the value of at least one CSI report quantity comprises at least one of: one of a single average value and a highest value for the common report quantity, and individual values for the individual report quantity.

[0172] In an embodiment, receiving by the at least one node, an indication of the categorization between common and individual report quantities in a form of a bitmap, wherein the bitmap is received in the CSI report.

[0173] In an embodiment, transmitting by the at least one node, the categorization between common and individual report quantities in a form of the bitmap.

[0174] In an embodiment, the bitmap is transmitted using Radio Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

[0175] In an embodiment, each bit of the bitmap indicate the category of the individual CSI report quantity of the at least one CSI report quantity.

[0176] In an embodiment, the length of the bitmap is equal to the size of the at least one CSI report quantity.

[0177] In an embodiment, the at least one node configures the at least one CSI report quantity as at least one of a common and individual, wherein the configuration is applicable for one of the at least one report configuration or the at least one sub-configuration.

[0178] In an embodiment, transmitting by the at least node, a parameter in one of RRC,MAC-CE and DCI, to represent the categorization of the at least one CSI report quantity as one of common and individual for the at least one sub-configuration.

[0179] In an embodiment, the parameter is a one -bit value.

[0180] In an embodiment, the association between the at least one CSI report quantity with the parameter is one of preconfigured and defined in standards.

[0181] In an embodiment, the at least one CSI report quantity defined as common report quantity in the standards.

[0182] In an embodiment, the at least one sub -configuration is categorized into plurality of groups; wherein the plurality of groups comprises at least one sub-configuration per group.

[0183] In an embodiment, the at least one CSI report quantity is same and the category of the at least one CSI report quantity in the plurality of groups is one of same and different.

[0184] In an embodiment, the at least one node comprises one of a base station, a gNB , relay, a repeater, user equipment (UE), and integrated access and backhaul (IAB).

[0185] The main objective of this invention is to propose techniques to reduce the number of CSI reports, reported for multiple spatial and / or power adaptations, based on various report quantities of the CSI and the correlation between them to reduce the uplink overhead of the UE. Further, the invention contains two step reporting of CSIs for multiple adaptation with partial CSI reporting and propose various methods to report differential values of CSI report quantities such as channel quality indicator.

[0186] 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 of 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 can be practiced without one or more specific details and / or with other methods.

[0187] 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 can generally be integrated together in a single software product or packaged into multiple software products.

[0188] 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.

[0189] 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 scripting language, a database query, or search language, and / or report writinglanguage. 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).

[0190] 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 can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can 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 can 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.

[0191] 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 can 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.

[0192] 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 of reporting Channel State Information (CSI) in a wireless communication system, the method comprising: receiving by at least one node, at least one first configuration, for measuring at least one CSI report quantity; receiving by the at least one node, at least one reference signal based on the at least one first configuration; measuring by the at least one node, at least one CSI report quantity using the at least one reference signal; determining a first value of at least one CSI report quantity for a second configuration chosen from the at least one first configuration; and determining at least one offset associated with the at least one CSI report quantity of at least one third configuration.

2. The method as claimed in claim 1, wherein the second configuration is the configuration having at least one of: maximum number of ports; maximum number of transmit and receive units (TXRUs), wherein the TXRUs comprise one or more of physical antennas, radio units, or spatial elements used for signal transmission and reception; same number of ports or same number of TXRUs as that of a linked resource set, wherein the linked resource set corresponds to the at least one resource for CSI measurements; maximum value of the at least one CSI report quantity; lowest or highest index, when the at least one first configuration are indexed in a sequential manner using the RRC configuration; and its associated at least one CSI report quantity mapped in a specific position in the UL resources containing the at least one CSI report.

3. The method as claimed in claim 1, wherein the second configuration is indicated in one of Radio Resource Configuration (RRC) configuration and a trigger signal for reporting at least one CSI quantity.

4. The method as claimed in claim 1, wherein the at least one third configuration comprises at least one configuration chosen from the at least one first configuration.

5. The method as claimed in claim 1, wherein the at least one offset is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration.

6. The method as claimed in claim 1, wherein the at least one first configuration comprises at least one of: at least one resource configuration; at least one sub-configuration; and at least one report configuration.

7. The method as claimed in claim 6, wherein the at least one resource configuration comprises at least one resource for CSI measurement.

8. The method as claimed in claim 6, wherein the at least one report configuration comprises information of the reference signal, at least one CSI report quantity to be reported and scheduling information for transmitting the at least one CSI report quantity.

9. The method as claimed in claim 1, wherein the at least one offset is a difference between the values of at least one CSI report quantity of two successive configurations.

10. The method as claimed in claim 1, wherein the at least one offset is the difference between the values of a differential report quantity of two successive configurations, wherein the differential report quantity is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration.

11. The method as claimed in claims 9 and 10, wherein, one of the two successive configurations is the latest configuration.

12. The method as claimed in claim 1, wherein the at least one CSI report quantity comprises at least one of: Channel Quality Indicator (CQI), Channel Rank Indicator (CRI), Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), Precoding Matrix Indicator (PMI), Layer indicator (LI), Rank Indicator (RI) and Signal-to-Interference-plus- Noise Ratio (SINR).

13. The method as claimed in claim 1, wherein the first value is used to estimate the value for SINR and corresponding CQI for the at least one third configuration based on number of spatial elements associated with the at least one third configuration, number of spatial elements associated with the second configuration and one of the SINR and CQI value corresponding to the second configuration, wherein the first value is one of CQI and SINR.

14. The method as claimed in claim 1 , wherein at least one offset is the difference between actual SINR value computed based on the reference signal measurement and the SINR value estimated using ratio of number of spatial elements associated with the second configuration and the at least one third configuration.

15. The method as claimed in claim 1, wherein the at least one offset value is the difference between actual CQI value computed based on the reference signal measurement and the CQI value based on the SINR estimated using the ratio of the number of spatial elements configured for the second configuration and the at least one third configuration.

16. The method as claimed in claim 1, further comprising reporting by the at least one node, at least one of: the first value; the at least one offset; a subset of at least one CSI report quantity; and an indication of an at least one fourth configuration, wherein the at least one fourth configuration is a subset of the at least one first configuration.

17. The method as claimed in claim 16, wherein the at least one offset is indicated using at least one bit.

18. The method as claimed in claim 17, wherein the indication is one of a positive change and a negative change, when the at least one bit consists of only 1 bit, wherein the 1 bit indicates one of enabled and disabled, and a positive change, no change and a negative change, when the at least one bit comprises of only 2 bits.

19. The method as claimed in claim 16, further comprises: receiving by the at least one node, an indication of at least one fifth configuration, wherein the at least one fifth configuration is a subset of the at least one fourth configuration; and receiving by the at least one node, a trigger to report the remaining quantities from the at least one CSI report quantity for the at least one fifth configuration.

20. The method as claimed in claim 19, wherein the trigger is a 1 -bit parameter.

21. The method as claimed in claim 16, the subset of at least one CSI report quantity is identified by the at least one node, by an indication received in one of Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

22. The method as claimed in claim 16, wherein the subset of the at least one CSI report quantity comprising at least one of:Part 1 CSI measurements; andPart 2 CSI measurements.

23. The method as claimed in claim 1, wherein the index of the at least one first configuration is pre-configured.

24. The method as claimed in claim 16, wherein the at least one node report the indices of the at least one fourth configuration in form of a bitmap.

25. The method as claimed in claim 24, wherein the length of the bitmap is equal to the number of the at least one first configuration.

26. The method as claimed in claim 25, wherein the mapping between indices and bitmap is one of predefined and configured.

27. The method as claimed in claim 16, wherein the at least one node reports the subset of at least one CSI report quantity that exceeds at least one threshold.

28. The method as claimed in claim 16, wherein the at least one node reports the subset of at least one CSI report quantity for the at least one fourth configuration.

29. The method as claimed in claim 16, wherein the at least one fourth configuration is associated with the lowest spatial adaptation pattern.

30. The method as claimed in claim 16, wherein the at least one fourth configuration is the configuration is from a set of the at least one first configuration wherein the set is associated with one of same number of ports or same number of TXRUs.

31. The method as claimed in claim 27, wherein the at least one threshold is one of configured and predefined.

32. The method as claimed in claim 27, wherein the at least one threshold represents one of a cut-off value for the at least one CSI report quantity or the size of the subset of the at least one first configuration with better measurements.

33. The method as claimed in claim 1, wherein the at least one node comprises one of a base station, a gNB, relay, a repeater, an integrated access and backhaul (IAB)- Distributed Units (DU), user equipment (UE), and lAB-mobile termination (MT).

34. A method of reporting Channel State Information (CSI) in a wireless communication system, the method comprising: receiving by at least one node, at least one report configuration for CSI reporting, wherein the at least one report configuration comprises at least one of at least one CSI report quantity and at least one sub -configuration;measuring by at least one node, at least one CSI report quantity for the at least one sub-configurations ; categorizing by at least one node, the at least one CSI report quantity of at least one sub-configurations into two groups; and reporting by the at least one node, the value of at least one CSI report quantity of at least one sub-configurations based on the categorization.

35. The method as claimed in claim 34, wherein the categorizing by the at least one node, comprises at least one of: grouping the at least one CSI report quantity having very low variance in their measured values for the at least one sub -configurations as common report quantity; and grouping the at least one CSI report quantity having very high variance in their measured values across the at least one sub -configurations as individual report quantity.

36. The method as claimed in claim 34, wherein the reporting by the at least one node, comprises at least one of: reporting one of a single average value and a highest value for the common report quantity; and reporting individual values for the individual report quantity.

37. The method as claimed in claim 34, wherein the at least one node report the categorization between common and individual report quantities in the CSI report in a form of a bitmap.

38. The method as claimed in claim 34, wherein the at least one node receives the categorization between common and individual report quantities in a form of the bitmap.

39. The method as claimed in claim 38, wherein the bitmap is received using Radio Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

40. The method as claimed in claims 37 and 38, wherein each bit of the bitmap indicate the category of the individual CSI report quantity of the at least one CSI report quantity.

41. The method as claimed in claims 37 and 38, wherein the length of the bitmap is equal to the size of the at least one CSI report quantity.

42. The method as claimed in claim 34, wherein the at least one node receives a configuration of the at least one CSI report quantity as at least one of a common and individual, wherein the configuration is applicable for one of the at least one report configuration or the at least one sub-configuration.

43. The method as claimed in claim 34, categorizing by the at least one node, comprising: receiving by the at least one node, a parameter in one of RRC, MAC-CE and DCI, to represent the categorization of the at least one CSI report quantity as one of common and individual for the at least one sub-configuration; and selecting by the at least one node, reporting of one of the common value and the individual values for the at least one CSI report quantity of the at least one subconfiguration based on the parameter.

44. The method as claimed in claim 43, wherein the parameter is a one -bit value.

45. The method as claimed in claim 43, wherein the association between the at least one CSI report quantity with the parameter is one of preconfigured and defined in standards.

46. The method as claimed in claim 34, wherein the at least one CSI report quantity defined as common report quantity in the standards.

47. The method as claimed in claim 34, wherein the at least one sub-configuration is categorized into plurality of groups; wherein the plurality of groups comprises at least one sub-configuration per group.

48. The method as claimed in claim 47, wherein the at least one CSI report quantity is same and the category of the at least one CSI report quantity in the plurality of groups is one of same and different.

49. The method as claimed in claim 34, wherein the at least one node comprises one of a base station, a gNB, relay, a repeater, an integrated access and backhaul (IAB)- Distributed Units (DU), user equipment (UE), and lAB-mobile termination (MT).

50. A method of receiving Channel State Information (CSI) in a wireless communication system, the method comprising: transmitting by at least one node, at least one first configuration, for measuring at least one CSI report quantity; transmitting by the at least one node, at least one reference signal based on the at least one first configuration; and receiving by the at least one node, at least one of: a first value of at least one CSI report quantity for a second configuration, and at least one offset associated with the at least one CSI report quantity of at least one third configuration.

51. The method as claimed in claim 50, wherein the second configuration is the configuration having at least one of: maximum number of ports; maximum number of transmit and receive units (TXRUs), wherein the TXRUs comprise one or more of physical antennas, radio units, or spatial elements used for signal transmission and reception; same number of ports or same number of TXRUs as that of a linked resource set, wherein the linked resource set corresponds to the at least one resource for CSI measurements; maximum value of the at least one CSI report quantity; lowest and highest index, when the at least one first configuration are indexed in a sequential manner using the RRC configuration; and its associated at least one CSI report quantity to be mapped in a specific position in the UL resources containing the at least one CSI report.

52. The method as claimed in claim 50, wherein the second configuration is transmitted in one of Radio Resource Configuration (RRC) configuration, MAC-CE, and a trigger signal for reporting at least one CSI quantity.

53. The method as claimed in claim 50, wherein the at least one third configuration comprises at least one configuration chosen from the at least one first configuration.

54. The method as claimed in claim 50, wherein the at least one offset is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration.

55. The method as claimed in claim 50, wherein the at least one first configuration comprises at least one of: at least one resource configuration; at least one sub-configuration; and at least one report configuration.

56. The method as claimed in claim 55, wherein the at least one resource configuration comprises at least one resource for CSI measurement.

57. The method as claimed in claim 55, wherein the at least one report configuration comprises information of the reference signal, at least one CSI report quantity to be reported and scheduling information for transmitting the at least one CSI report quantity.

58. The method as claimed in claim 50, wherein the at least one offset is a difference between the values of at least one CSI report quantity of two successive configurations.

59. The method as claimed in claim 50, wherein the at least one offset is the difference between the values of a differential report quantity of two successive configurations, wherein the differential report quantity is a difference between the first value and a second value of the at least one CSI report quantity of the at least one third configuration.

60. The method as claimed in claims 58 and 59, wherein, one of the two successive configurations is the latest configuration.

61. The method as claimed in claim 50, wherein the at least one CSI report quantity comprises at least one of: Channel Quality Indicator (CQI), Channel Rank Indicator (CRI), Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), Precoding Matrix Indicator (PMI), Layer indicator (LI), Rank Indicator (RI) and Signal-to-Interference-plus- Noise Ratio (SINR).

62. The method as claimed in claim 50, wherein the first value is used to estimate the value for SINR and corresponding CQI for the at least one third configuration based on number of spatial elements associated with the at least one third configuration, number of spatial elements associated with the second configuration and one of the SINR and CQI value corresponding to the second configuration, wherein the first value is one of CQI and SINR.

63. The method as claimed in claim 50, wherein at least one offset is the difference between actual SINR value computed based on the reference signal measurement and the SINR value estimated using ratio of number of spatial elements associated with the second configuration and the at least one third configuration.

64. The method as claimed in claim 50, wherein the at least one offset is used to calculate at least one actual SINR of the at least one third configuration using estimated SINR and the offset; and determine, CQI for the at least one third configuration using calculated actual SINR value.

65. The method as claimed in claim 50, wherein the at least one offset value is the difference between actual CQI value computed based on the reference signal measurement and the CQI value based on the SINR estimated using the ratio of the number of spatial elements configured for the second configuration and the at least one third configuration.

66. The method as claimed in claim 50, wherein the at least one offset is used to calculate CQI for the at least one third configuration using estimated CQI value and the offset.

67. The method as claimed in claim 50, further comprising receiving by the at least one node, at least one of: a subset of at least one CSI report quantity; and an indication of at least one fourth configuration, wherein the fourth configuration is a subset of the at least one first configuration.

68. The method as claimed in claim 50, wherein the at least one offset is received using at least one bit.

69. The method as claimed in claim 68, wherein the indication is one of a positive change and a negative change, when the at least one bit consists of only 1 bit, wherein the 1 bit indicates one of enabled and disabled, and a positive change, no change and a negative change, when the at least one bit comprises of only 2 bits.

70. The method as claimed in claim 67, further comprises: transmitting by the at least one node, an indication of at least one fifth configuration, wherein the at least one fifth configuration is a subset of the at least one fourth configuration; and transmitting by the at least one node, a trigger to report the remaining quantities from the at least one CSI report quantity for the at least one fifth configuration.

71. The method as claimed in claim 70, wherein the trigger is a 1-bit parameter.

72. The method as claimed in claim 67, the subset of at least one CSI report quantity is indicated by the at least one node in one of: Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

73. The method as claimed in claim 50, wherein the subset of the at least one CSI report quantity comprising at least one of:Part 1 CSI measurements; andPart 2 CSI measurements.

74. The method as claimed in claim 50, wherein the index of the at least one first configuration is pre-configured.

75. The method as claimed in claim 67, wherein the at least one node receives the indices of the at least one fourth configuration in form of a bitmap.

76. The method as claimed in claim 75, wherein the length of the bitmap is equal to the number of the at least one first configuration.

77. The method as claimed in claim 76, wherein the mapping between indices and bitmap is one of predefined and configured.

78. The method as claimed in claim 67, wherein the at least one node receives the subset of at least one CSI report quantity that exceeds at least one threshold.

79. The method as claimed in claim 67, wherein the at least one node receives the subset of at least one CSI report quantity for the at least one fourth configuration.

80. The method as claimed in claim 67, wherein the at least one fourth configuration is associated with the lowest spatial adaptation pattern.

81. The method as claimed in claim 67, wherein the at least one fourth configuration is the configuration chosen from a set of the at least one first configuration wherein the set is associated with one of same number of ports or same number of TXRUs.

82. The method as claimed in claim 78, wherein the at least one threshold is one of configured and predefined.

83. The method as claimed in claim 78, wherein the at least one threshold represents one of a cut-off value for the at least one CSI report quantity or the size of the subset of the at least one first configuration with better measurements.

84. The method as claimed in claim 50, wherein the at least one node comprises one of a base station, a gNB, relay, a repeater, an integrated access and backhaul (IAB)- Distributed Units (DU), user equipment (UE), and lAB-mobile termination (MT).

85. A method of receiving Channel State Information (CSI) in a wireless communication system, the method comprising: transmitting by at least one node, at least one report configuration for CSI reporting, wherein the at least one report configuration comprises at least one of at least one CSI report quantity and at least one sub -configuration; and receiving by the at least one node, the value of at least one CSI report quantity of at least one sub-configurations based on a categorization.

86. The method as claimed in claim 85, wherein the categorization comprises at least one of: grouping the at least one CSI report quantity having very low variance in their values for the at least one sub-configurations as common report quantity; and grouping the at least one CSI report quantity having very high variance in their values across the at least one sub-configurations as individual report quantity.

87. The method as claimed in claim 85, wherein the value of at least one CSI report quantity comprises at least one of: one of a single average value and a highest value for the common report quantity; and individual values for the individual report quantity.

88. The method as claimed in claim 85, further comprises receiving by the at least one node, an indication of the categorization between common and individual report quantities in a form of a bitmap, wherein the bitmap is received in the CSI report.

89. The method as claimed in claim 85, further comprises transmitting by the at least one node, the categorization between common and individual report quantities in a form of the bitmap.

90. The method as claimed in claim 89, wherein the bitmap is transmitted using Radio Resource Control (RRC), Medium Access Control - Control Element (MAC-CE) or Downlink Control Information (DCI).

91. The method as claimed in claims 87 and 88, wherein each bit of the bitmap indicate the category of the individual CSI report quantity of the at least one CSI report quantity.

92. The method as claimed in claims 87and 88, wherein the length of the bitmap is equal to the size of the at least one CSI report quantity.

93. The method as claimed in claim 85, wherein the at least one node configures the at least one CSI report quantity as at least one of a common and individual, wherein the configuration is applicable for one of the at least one report configuration or the at least one sub-configuration.

94. The method as claimed in claim 85, transmitting by the at least one node, comprising: transmitting by the at least node, a parameter in one of RRC, MAC-CE and DCI, to represent the categorization of the at least one CSI report quantity as one of common and individual for the at least one sub-configuration.

95. The method as claimed in claim 94, wherein the parameter is a one -bit value.

96. The method as claimed in claim 94, wherein the association between the at least one CSI report quantity with the parameter is one of preconfigured and defined in standards.

97. The method as claimed in claim 85, wherein the at least one CSI report quantity defined as common report quantity in the standards.

98. The method as claimed in claim 85, wherein the at least one sub-configuration is categorized into plurality of groups; wherein the plurality of groups comprises at least one sub-configuration per group.

99. The method as claimed in claim 98, wherein the at least one CSI report quantity is same and the category of the at least one CSI report quantity in the plurality of groups is one of same and different.

100. The method as claimed in claim 85, wherein the at least one node comprises one of a base station, a gNB, relay, a repeater, user equipment (UE), and integrated access and backhaul (IAB).

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