Sounding reference signal transmission occasion determination for a reference user equipment antenna port

Abstract

Disclosed herein is an apparatus. The apparatus is configured to determine a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion and a first symbol of the occasions of the CSI-RSs resources. The first SRS transmission occasion occurs before the occasions of the CSI-RSs resources. The apparatus is also configured to determine a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a second SRS transmission occasion after the occasions of the CSI-RSs resources. Moreover, the apparatus is configured to select either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

Description

SOUNDING REFERENCE SIGNAL TRANSMISSION OCCASION DETERMINATION FOR A REFERENCE USER EQUIPMENT ANTENNA PORTCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to India Provisional Application No. 202411088480, filed on November 15, 2024, and India Non-Provisional Application No. 202411088480, filed on April 23, 2025. the entire contents of which are incorporated herein by reference.FIELD

[0002] The present disclosure relates to a Sounding Reference Signal (SRS) transmission occasion determination for a reference User Equipment (UE) antenna port.BACKGROUND

[0003] The information disclosed in this background section is only for an enhancement of understanding of the general background of the disclosure and should not be taken as an acknowledgment or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

[0004] A Sounding Reference Signal (SRS) is a component in wireless communication systems, particularly in Long Term Evolution (LTE) and 5G networks. The SRS corresponds to a type of pilot signal used by a User Equipment (UE) to measure the channel conditions and adjust its transmission parameters accordingly. The SRS enables efficient estimation of the radio environment, allowing the network to optimize resource allocation, enhance data rates, and improve overall communication reliability. Typically transmitted at predefined intervals, theSRS provides the network with essential feedback about the user's channel quality, facilitating adaptive modulation and coding techniques not only for Uplink (UL) but also for Downlink (DL) if the channel reciprocity is assumed, which are vital for maintaining high-quality connections in varying conditions. The channel reciprocity is generally valid for Time Division Duplexing (TDD) systems.

[0005] Beamforming is a technique that uses multiple antennas for delivering electromagnetic signals in wireless transmissions. By adjusting phases and amplitudes of signals emitted from antennas to match phase rotations and attenuations of paths, constructive interference can be achieved at receivers. Thus, beamforming techniques improve efficiency and coverage. Modem wireless systems, including 5G and future 6G, utilize a distribution of base station antennas at various locations, referred to as Transmission and Reception Points (TRPs). A base station generates beamforming weights, that include a phase and amplitude, based on an estimate of the DL channel. In the TDD system, SRSs are essential for DL beamforming calculation.

[0006] When the SRSs are used to calculate DL beamforming weights, UL-DL phase calibration is necessary'. For distributed antenna arrangements with multiple TRPs, phase offset reporting and SRS reception from one UE are utilized for UL-DL phase calibration across multiple TRPs.SUMMARY

[0007] This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the disclosure. This summary is neither intended to identify key or essential inventive concepts of the present disclosure nor is it intended to determine the scope of the disclosure.

[0008] According to one embodiment of the present disclosure, an apparatus is disclosed. The apparatus is configured to determine a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion and a first symbol of the occasions of Channel State Information-Reference Signals (CSI-RSs) resources. The first SRS transmission occasion occurs before the occasions of the CSI-RSs resources. The apparatus is also configured to determine a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a second SRS transmission occasion after the occasions of the CSI-RSs resources. Moreover, the apparatus is configured to select either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

[0009] According to another embodiment of the present disclosure, a method is disclosed. The method includes determining a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion and a first symbol of the occasions of Channel State Information-Reference Signals (CSI-RSs) resources. The first SRS transmission occasion occurs before the occasions of the CSI-RSs resources. The first time interval is determined by a gNodeB (gNB). The method also includes determining, by the gNB, a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a first SRS transmission occasion after the occasions of the CSI-RSs resources. Moreover, the method includes selecting, by the gNB, either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

[0010] According to another embodiment of the present disclosure, a non-transitory computer-readable medium is disclosed. The non-transitory computer-readable medium stores instructions. The instructions comprise one or more instructions that are executed by a gNodeB (gNB). The gNB comprises one or more processors. The one or more instructions cause the one or more processors to determine a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion and a first symbol of the occasions of Channel State Information-Reference Signals (CSI-RSs) resources. The first SRS transmission occasion occurs before the occasions of the CSI-RSs resources. The one or more instructions also cause the one or more processors to determine a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a second SRS transmission occasion after the occasions of the CSI-RSs resources. Moreover, the one or more instructions also cause the one or more processors to select either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

[0011] To further clarify the advantages and features of the present disclosure, a more particular description of the disclosure will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawing. It is appreciated that these drawings depict only typical embodiments of the disclosure and are therefore not to be considered limiting its scope. The disclosure will be described and explained with additional specificity and detail with the accompanying drawings.BRIEF DESCRIPTION OF DRAWINGS

[0012] Features, aspects, and advantages of certain example embodiments of the disclosure will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, and wherein:FIG. 1A is a diagram of an example of implementation environment in which systems and / or methods, described herein, may be implemented, in accordance with an embodiment of the present disclosure;FIG. IB illustrates a network deployment scenario, in accordance with an embodiment of the present disclosure;FIG. 2 illustrates an example scenario depicting a relationship between Channel State Information-Reference Signals (CSI-RSs) for a User Equipment (UE) to perform Downlink (DL) phase offset measurement and associated Sounding Reference Signal (SRS) for a gNodeB (gNB) to perform Uplink (UL) phase offset measurement, in accordance with an embodiment of the present disclosure;FIG. 3 illustrates a flowchart depicting a method for determining SRS transmission occasion, in accordance with an embodiment of the present disclosure;FIG. 4 illustrates a flowchart depicting a method for selecting either a first or a second SRS transmission occasion, in accordance with an embodiment of the present disclosure; and FIG.5 illustrates an embodiment of a device, in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION

[0013] The following detailed description of example embodiments refers to the accompanying drawings. The present disclosure provides illustrations and descriptions, but is not intended tobe exhaustive or to limit the implementations to the precise form disclosed. Modifications and variations are possible in light of the present disclosure or may be acquired from practice of the implementations. Further, one or more features or components of one embodiment may be incorporated into or combined with another embodiment (or one or more features of another embodiment). Additionally, the flowchart and description of operations provided below relate to at least one of the embodiments in the present disclosure. It should be noted that it is possible to make other embodiments that do not exactly match the flowchart and its description. It is understood that in other embodiments one or more operations may be omitted, one or more operations may be added, one or more operations may be performed simultaneously (at least in part).

[0014] It will be apparent that systems and / or methods, described herein, may be implemented in different forms of hardware, software, or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods should not limit their implementations. Thus, the operation and behavior of the systems and / or methods are described herein without reference to specific software code. It is understood that software and hardware may be designed to implement the systems and / or methods based on the description herein.

[0015] Even though particular combinations of features are recited in the claims and / or disclosed in the specification, the particular combinations are not intended to limit the disclosure of implementations. In fact, many of these features may be combined in ways not specifically recited in the claims and / or disclosed in the specification. Even if a dependent claim directly depends on only one claim, the present disclosure may indicate that the dependent claim is dependent on other claims in the claim set.

[0016] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles ‘‘a” and ”an“ are intended to include one or more items, and may be used interchangeably with “one or more.” Also, as used herein, the terms “has,” “have,” “having.” “include,” “including,” or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Furthermore, expressions such as “at least one of [A] and [B],” “[A] and / or [B],” or “at least one of [A] or [B]” are to be understood as including only A. only B. or both A and B.

[0017] The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the implementations to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the implementations.

[0018] Using multiple antennas at a Next Generation Node B (gNB) and / or an evolved NB (eNB), a beamforming gain is achieved by appropriately adjusting phases and amplitudes of one or more signals emitted from the antennas to match with phase rotation and channel gains / losses caused by one or more propagation channels towards a receiving antenna. Hence, signals from different transmitting antennas are added constructively at a User Equipment’s (UE’s) receiving antenna. Such phase and amplitude adjustment is collectively referred to as a beamformer.

[0019] To derive the beamformer, the gNB may require information about channels from the transmitting antennas to the receiving antenna. One method to obtain a Channel State Information (CSI), which is applicable for Time Division Duplexing (TDD), is estimating the channel based on Sounding Reference Signals (SRSs). The SRSs are know n signals sent by theUE. The gNB uses the channel estimate as a downlink (DL) channel to derive the beamformer. For this, channel reciprocity is assumed. That is, dissipation and phase change of a propagation path from Antenna A of the gNB to Antenna B of the UE (i.e., the DL channel) are identical to one from Antenna B to Antenna A (i.e., an uplink (UL) channel). The assumption is valid to some certain extent if contribution of a hardware is excluded, i.e., the propagation paths only account for parts from transmitting antenna ports to a receiving antenna port excluding transmitting chains of the transmitting antennas and a receiving chain of the receiving antenna.

[0020] In reality, the received SRS is extracted after the receiving chains at the gNB, and beamformed user data signals (i.e., Physical Downlink Shared Channel (PDSCH) and relevant DeModulation Reference Signal (DMRS)) are inserted before the transmitting chains at the gNB. The transmitting and receiving chains usually have different phase changes. Considering an antenna array of M antenna elements at the gNB, to facilitate the beamforming based on the SRS, the gNB needs to obtain one of the following levels of attribute:Level 1 - Joint transmit-receive phase alignment.Attribute 1.1 - The differences between the phase differences between transmitting and receiving chains of Antennas 2, 3, ... , M and that of Antenna 1. Level 2 - Separate transmit-receive phase alignment.Attribute 2.1 - The phase differences between the transmitting chains of Antennas 2,3, ... , M and that of Antenna 1.Attribute 2.2 - The phase differences between the receiving chains of Antennas 2, 3,... , M and that of Antenna 1.

[0021] In particular, let ti and r; be the phase rotations caused by the transmitting and receiving chains of antenna i, respectively. Obtaining Attribute 2.1 means that (ti-t 1 )mod(27t) are knownfor i=2, 3, M. Obtaining Attribute 2.2 means that (ri-rl)mod(27r) are known for i=2, 3, , M. Obtaining Attribute 1.1 means that (ti-tl+rl-ri)mod(27t) are known for i=2, 3, ... , M. Achieving Level 2 implies that Level 1 is also achieved. For channel reciprocal based beamforming, Attribute 1.1 at Level 1 is sufficient. However, implementing a digitally controlled grid of beams may involve Attribute 2.1 at Level 2. In any case, the gNB can prerotate the signals at different antennas to compensate for the differences. The joining of phase difference acquisition and pre-compensation is known as a DL / UL calibration.

[0022] If all the antennas in the antenna array are physically localized, various methods can be used to obtain the attributes in Levels 2 and 1. For example, in one method, for any pair of antennas, when the antennas in turn transmit a reference pulse while the other receives, Attribute 1.1 can be obtained. In addition, if a mutual coupling coefficient between any pair of antennas is known, which can be theoretically achievable due to a short distance between the antennas, Attributes 2.1 and 2.2 can be obtained for any groups of three antennas by exchanging the reference signals between them similar to the method discussed above. Said method can be extended for any group of more than three antennas. The discussed calibration methods may be implemented without involvement of additional devices, such as the UE.

[0023] The on-going Release 19 Work Item on Multiple-Input Multiple-Output (MIMO) enhancement in Third Generation Partnership Project (3GPP) Radio Access Network (RAN) considers using multiple Transmission and Reception Points (multi-TRPs) in a joint transmission to beamform to a single UE. This scheme is called Coherent Joint Transmission (CJT) that can improve network coverage. The CJT, assisted by multi-TRPs, may become an important technique in 6G wireless systems. The calibration methods applied for the localized antenna array calibration do not fully work for an antenna array that is fragmented at differentTRPs of different locations. For the channel reciprocal based beamforming in the TDD, at least Attribute 1.1 at Level 1 could be accessible to a network. While this can be achieved at each individual TRP as aforementioned, exchanging the reference signals between two TRPs may not be feasible in many cases. For example, exchanging the reference signals may be prevented by blockages or a large distance between the two TRPs. Using any UE that is in good radio conditions, to both the TRPs can assist the calibration across the TRPs. The following steps may be used for assisting the phase calibration at the number of TRPs (NTRP ) to support the CJT:Step 1 : The network (NW) selects NTRP antennas, wherein the selected NTRP antennas are the antennas in the antenna array at a different TRP, to transmit non-zero power (NZP) CSI-Reference Signals (CSI-RSs) toward the UE.Step 2 : The UE receives CSI-RSs and measures the phase differences at one of its antenna;Step 3 : The UE reports to the NW the phase offsets (i.e. , the phase differences between the path from one reference TRP and the rest);Step 4 : The UE uses the antenna that receives the CSI-RSs to transmit the SRS; and Step 5 : The NW receives the SRS and measures the phase differences at the set of antennas used in Step 1.

[0024] The above-mentioned procedure includes two loops. In Loop 1 (including Steps 1, 2, and 3), the NW sends out the CSI-RS and takes back the report on the DL phase offsets. In Loop 2 (including Steps 4 and 5), the NW receives the SRS to measure the UL phase offsets. While the steps in the Loop 1 and the Loop 2 are defined in an order, the two loops (i.e., the Loop 1 and the Loop 2) may be carried out as two independent processes, and the phase offsetmeasurements from both processes may be used in the final compensation. However, it is desirable that a time interval between the CSI-RS and the SRS transmissions is small to minimize an impact of wireless channel variation.

[0025] For the Loop 1, the NW triggers an aperiodic report whose configuration is identified by a CSI Report Configuration, which is linked to a Non-zero-power (NZP) CSI-RS Resource Setting / configuration so that the UE will know when to measure and when to report in reference to a triggering time. For Loop 2, the NW signals an association between the CSI Report Configuration and an SRS resource configuration in an existing SRS Resource Setting, which aims to define a single antenna port, referred to as a “reference UE antenna port”. The reference UE antenna port may be used for both receiving the CSI-RSs in Loop 1 and sending the SRS in Loop 2. It is possible that the UE transmits the SRS in the usage manner of “antenna switching”, in which different subsets of UE antennas are used on different occasions of the SRS. The CSI-RS resource configuration, the associated SRS resource configuration, and reporting configuration are signalled to the UE via Radio Resource Control (RRC) layer signalling. Further, the trigger of a phase offset report is indicated in a Downlink Control Information (DCI) message. In case the associated SRS appears with multiple occasions, the NW and the UE may determine which occasion is used for the calibration to establish the “reference UE antenna port” accordingly.

[0026] The configured associated SRS resource can be either periodic, semi-persistent, or aperiodic. For the case of periodic or semi-persistent SRS resources, the SRS transmission occasion for determining the reference UE antenna port can either be one of:Option 1 corresponding to the latest SRS transmission occasion before the occasions of the Non-Transparent Redundancy Proportional (NTRP CSI-RS) resources used for measuring phase offsets, orOption 2 corresponding to the earliest SRS transmission occasion after NTRP CSI-RS occasions of the NTRP CSI-RS resources used for measuring phase offsets.

[0027] Both the above options are feasible and any of them can be implemented. However, to minimize the time interval between the SRS transmission occasion and the CSI-RS transmission occasions, the features of both options may be used.

[0028] The present disclosure provides a solution to the above-mentioned problem(s). Particularly, the present disclosure provides a solution where both the options (i.e., Option 1 and Option 2) for determining the SRS transmission occasion are combined. For this, both the NW and the UE identify the SRS transmission occasion determining the reference UE antenna port, as explained in detail in the forthcoming paragraphs.

[0029] Referring now to the drawings, and more particularly to FIGS. 1A to 5, where similar reference characters denote corresponding features consistently throughout the figures.

[0030] FIG. 1A is a diagram of an example of implementation environment 100-A in which systems and / or methods, described herein, may be implemented in accordance with an embodiment of the present disclosure. The implementation environment 100-A includes a UE 110, a service environment 120, and a network 130. The sendee environment 120 includes one or more sub-environments 121. To illustrate this, FIG. 1A shows, for convenience, examples of a 1st sub-environment 121-1, a 2nd sub-environment 121-2, and an N-th sub-environment 121-N (where N is any natural number).

[0031] The UE 110 is connected to the network 130, and the network 130 is connected to the service environment 120. The connections may be wired, wireless, or a combination of both wired and wireless. The UE 110 and the service environment 120 are connected via the network 130.

[0032] The UE 110 is a device that communicates with the service environment 120. The UE 110 receives information from the service environment 120 and / or sends information to the senice environment 120. Also, the UE 110 may generate and / or store information to be transmitted, as necessary. Also, the UE 110 may store and / or process information that is received, as necessary.

[0033] The example FIG. 1A refers to the UE". However, it should be understood by those skilled in the art that general terms such as "‘user device,” "‘terminal.” “terminal device,” “communication device,” and “communication terminal” can be used interchangeably with the term“UE.”

[0034] For example, the UE 110 may include a computing device (e.g., a desktop computer, a laptop computer, a tablet computer, a handheld computer, a smart speaker, a server, etc ), a mobile phone (e.g., a smart phone, a radiotelephone, etc.), a wearable device (e.g., a pair of smart glasses or a smart watch), or a similar device.

[0035] The sendee environment 120 is an environment that communicates with the UE 110 to provide one or more services. The service environment 120 receives information from the UE 110 and / or sends information to the UE 110. Also, the service environment 120 may generate and / or store information to be transmitted, as necessary. Also, the service environment 120 may store and / or process information that is received, as necessary7. For example, the service environment 120 may provide computing resources as one of the services. The service extendsbeyond UEs alone and may also be provided to various other devices. For example, based on communication from the UE, the service may perform processes such as anomaly detection or traffic analysis and notify the results to a predetermined destination.

[0036] The example FIG. 1A refers to the "‘service environment"’. The term “service environment” is used to refer to the broader context within which services operate. For example, cloud environments, platforms, computing systems, network systems, and cloud systems generally represent the environments in which services are conducted, and these are included within the “service environment.” However, the “sendee environment” is not limited to these examples. Additionally, the specific types of environments within the “service environment” are not restricted. For instance, cloud environments and cloud systems can be categorized as private cloud, public cloud, hybrid cloud, or multi-cloud, all of which are included within the “service environment.”

[0037] The one or more services provided by the service environment 120 is not specifically limited and can be adjusted according to the embodiments. For example, the services may include a service that provides information to the UE 110, a service that stores information from the UE 110, or a sen-ice that performs processing based on information from the UE 110 and returns the results of the processing.

[0038] In an embodiment, the service environment 120 may also provide computing resources as the service. The computing resources can be hardware resources and / or software resources. For example, applications, processors, memory, and storage may be included in the provided computing resources. The computing resources may communicate with each other via wired connections, wireless connections, or a combination of wired and wireless connections.

[0039] The provided computing resources can be actual resources (also referred to as physical resources) and / or virtual resources. Furthermore, means of virtualization for virtual resources can be selected as appropriate. That is, in this disclosure, the use of adjectives such as “Virtual” or “Virtualized” to describe names does not imply that they are virtualized by a specific means of virtualization. For example, “virtual machine” refers to software that operates like an actual computer, realized through means of virtualization, and it is not intended to exclude those realized by specific means of virtualization such as hypervisors or containers. Conversely, when means of virtualization such as hypervisors or containers are mentioned in this disclosure, it is merely cited as a general method of implementation. It should also be interpreted that embodiments implemented with other virtualization means are also disclosed. Also, the services may also be provided using resources virtualized by different means.

[0040] The service environment 120 includes one or more devices 122, such as servers and network devices, which provide services or perform processes. To illustrate this, FIG. 1A shows, for convenience, examples of a 1st device 122-1, a 2nd device 122-2, and anN-th device 122-N (where N is any natural number). In one embodiment, the one or more devices 122 may correspond to a gNB associated with a network. A placement of the one or more devices 122 within the service environment 120 may be determined as appropriate. Additionally, if the sendee environment 120 includes one or more sub-environments 121, a placement of the one or more devices 122 may be determined based on predetermined policies for each subenvironment 121. For example, devices related to the first service may be placed in the 1st subenvironment 121-1, and devices related to the second service may be placed in the 2nd subenvironment 121-2. In another example, devices expected to have a higher load than a predetermined threshold may be placed in the 1st sub-environment 121-1, while devicesexpected to have a lower load than the predetermined threshold may be placed in the 2nd subenvironment 121-2. In this way, specific devices can be placed in specific sub-environments 121. Conversely, the one or more sub-environments 121 may be specialized for a particular purpose.

[0041] In an embodiment, the processes executed in a single service may run within a single senice environment, or in multiple service environments. Multiple processes executed in a single service could be provided by different service environments.

[0042] The network 130 is a network that exchanges information between the UE 110 and the senice environment 120. The network 130 includes one or more wired and / or wireless networks.

[0043] For example, the network 130 may include a cellular network (e g., a fifth generation (5G) network, a long-term evolution (LTE) network, a third generation (3G) network, a code division multiple access (CDMA) network, etc.), a public land mobile network (PLMN), a local area network (LAN), a wide area network (WAN), a metropolitan area network (MAN), a telephone network (e.g., the Public Switched Telephone Network (PSTN)), a private network, an ad hoc network, an intranet, the Internet, a fiber optic-based network, or the like, a nonterrestrial network (NTN), and / or a combination of these or other types of networks.

[0044] The network 130 may be a part of anetwork. For example, in a 5G network that includes a RAN, a transport network, and a core network, the network 130 may be at least one of the RAN, the transport network, or the core network. For example, the service environment 120 could be in the core network, in which case the network 130 could correspond to a network that is a combination of a RAN and a transport network and is part of the 5G network.

[0045] The number and arrangement of devices and networks shown in FIG. 1A are provided as an example. It should be understood that any changes that may be implemented by those skilled in the art, such as the addition or rearrangement of well-known devices or networks at the time of implementation, are included in this disclosure.

[0046] FIG. IB illustrates a network deployment configuration 100-B. in accordance with an embodiment of the present disclosure.

[0047] The network deployment configuration 100-B illustrates an example implementation of CJT. As depicted in FIG. IB, the network deployment configuration 100-B includes the UE 110 in wireless communication with a plurality of Transmission and Reception Points (TRPs) 140-1, 140-2, 140-3, .... 140-N, where N represents a positive integer indicating the total number of TRPs in the configuration. Each of TRP 140-1, or 140-2, or 140-3, ..., or 140-N may include one or more antenna elements capable of transmitting and receiving radio frequency signals. In various implementations, the TRPs 140-1, 140-2, 140-3, ..., 140-N may include base stations, remote radio heads, or distributed antennas. The TRPs 140-1, 140-2, 140-3, ..., 140-N may provide service(s) to the UE 110 through wireless links, with a same signal being beamformed at the TRPsl40-l, 140-2, 140-3, ..., 140-N. Such transmission enhances the DL signal strength received by the UE 110.

[0048] The plurality7of TRPs 140-1, 140-2, 140-3, ..., 140-N may be communicatively coupled to the network 130. A plurality7of bidirectional communication paths may be established between the UE 110 and one or more TRPs among the plurality of TRPs 140-1, 140-2, 140-3, ..., 140-N. The plurality7of bidirectional communication paths, enable concurrent signal transmission and reception between the UE 110 and the corresponding TRP.

[0049] The network deployment configuration 100-B facilitates the implementation of the CJT. In the CJT, a plurality of identical signals are beamformed from one or more of the plurality of TRP 140-1 , 140-2, 140-3, ..., 140-N towards the UE 110. The CJT may enhance the DL signal receive strength at the UE 110. Transmitting the plurality of identical signals may provide improved coverage to the UE 110.

[0050] FIG.2 illustrates an example scenario depicting a relationship between the CSI-RSs for DL phase offset measurement and the associated SRS, in accordance with an embodiment of the present disclosure.

[0051] Referring to FIG. 2, a time interval between a last symbol 202 of a latest SRS transmission occasion before occasions of NTRP CSI-RS resources and a first symbol 204 of occasions of the NTRP CSI-RS resources 208 may be considered as Ki. Similarly, a time interval between a last symbol 206 of the occasions of the NTRP CSI-RS resources and the symbol 208 of an earliest SRS transmission occasion after the occasions of the NTRP CSI-RS resources may be considered as K2. The SRS transmission occasions may refer to specific one or more time slots that may carry' SRS symbols. The SRS symbols may occur periodically according to the SRS resource configuration being applied to the UE 110. The occasions of the NTRP CSI-RS resources may refer to specific one or more time slots during which the NTRP CSI-RS symbols, which correspond to the phase offset report triggered by the NW, are transmitted by the gNB 122. A plurality' of antennas correspond to the plurality of TRPs 140-1, 140-2, 140-3, ..., 140-N at different locations. The plurality of antennas are used for transmitting the CSI-RSs towards the UE 110.

[0052] According to the present disclosure, the Ki and the K2 may be compared. When the Ki is either less than or equal to the K2, the latest SRS transmission occasion before the occasionsof the NTRP CSI-RS resources is used as the SRS transmission occasion identifying the reference UE antenna port. Alternatively, when Ki is greater than K2, the earliest SRS transmission occasion after the occasions of the NTRP CSI-RS resources is used as the SRS transmission occasion identifying the reference UE antenna port. The present disclosure enables easy identification of a UE’s reference antenna port to achieve closest time between the SRS transmission occasion and CSI-RS transmission occasions.

[0053] FIG. 3 illustrates a flowchart depicting a method 300 for determining the SRS transmission occasion, in accordance with an embodiment of the present disclosure. The method 300 may be performed by both the UE 110 and the gNB 122.

[0054] At step 302, the UE 110 and the gNB 122 may determine a first time interval (Ki) between the symbol 202 of a latest Sounding Reference Signal (SRS) transmission occasion before occasions of Channel State Information- Reference Signals (CSI-RSs) resources, and the first symbol 204 of the occasions of the CSI-RSs resources. The first time interval (Ki) may be defined as a shorted distance between the SRS transmission occasions before the occasions of CSI-RS resources and the occasions of CSI-RS resources. In an embodiment, a first SRS transmission occasion may correspond to the latest SRS transmission occasion before the occasions of the CSI-RSs resources. In an embodiment, the CSI-RSs resources may correspond to the NTRP CSI-RSS resources. The NTRP CSI-RSS resources may indicate the plurality of TRPs 140-1, 140-2, 140-3, ..., 140-N used for the transmission of the CSI-RSs resources.

[0055] At step 304, the gNB 122 may determine a second time interval (K2) between the last symbol 206 of the occasions of the CSI-RSs resources and the symbol 208 of the earliest SRS transmission occasion after the occasions of the CSI-RSs resources. The second time internal (K2) may be defined as a shorted distance between the occasion of the CSI-RSs resources andthe SRS transmission occasions after the occasions of the CSI-RS resources. In an embodiment. the second SRS transmission occasion may correspond to the earliest SRS transmission occasion after the occasions of the CSI-RSs resources. Thus, the present disclosure identifies a shorted / closed distance between the SRS transmission occasions and the occasions of the CSI-RSs resources.

[0056] At step 306. the gNB 122 may select either the first or second SRS transmission occasion for identifying the reference UE antenna port associated with a corresponding UE 110 based on the determined first time interval (Ki) and the second time interval (K2). The reference UE antenna port may correspond to an antenna port that is performing the transmission of SRS occasion and / or reception of the CSI-RSs resources. The UE 110 may measure the received CSI-RSs resources at the reference UE antenna port and derive relative phase offsets between a first and remaining TRPs associated with the gNB 122. The UE 110 may derive the relative phase offsets for sub-band(s) and may report the derived value to the network (i.e.. the gNB 122). The network / gNB 122 may measure the SRS transmitted by the reference UE antenna port (interchangeably referred to as the UE reference antenna port) in the SRS occasions and derive the relative phase offsets between the first and the remaining TRPs for the sub-band(s). The present disclosure defines the SRS occasion for the UE's ‘‘reference antenna port” to avoid ambiguiN in such measurements, as the UE 110 may have multiple transmit antennas used in different SRS occasions. The present disclosure enables identification of the SRS occasion to minimize a gap between the CSI-RSs and SRS occasions, which are used for Downlink (DL) and Uplink (UL) phase offset measurements, ensuring that the phases of UL and DL channels are approximately identical.

[0057] In an embodiment, the occasions of the CSI-RSs resources may correspond to CSI-RSs transmission from the plurality of TRPs 140-1, 140-2, 140-3, ..., 140-N associated with the gNB 122 associated with the corresponding UE 110.

[0058] In an embodiment, the occasions of the CSI-RSs resources may indicate the corresponding UE 110 to measure the phase offsets among the number of TRPs.

[0059] In an embodiment, the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources may correspond to a corresponding reception of the SRSs by the apparatus from the corresponding UE 110.

[0060] In an embodiment, the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources may occur periodically based on a pre-configured time interval.

[0061] In an embodiment, the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources may occur aperiodically.

[0062] FIG. 4 illustrates a flowchart depicting a method 400 for selecting either the first or second SRS transmission occasion, in accordance with an embodiment of the present disclosure. The method 400 may be performed by the gNB 122.

[0063] At step 402, the gNB 122 may compare the determined first time interval (Ki) and the determined second time interval (K2).

[0064] At step 404, the gNB 122 may determine whether the first time interval (Ki) is less than the determined second time interval (K2) based on the comparison of the determined first time interval (Ki) and the determined second time interval (K2).

[0065] At step 406, in response to determining that the first time interval (Ki) is less than the determined second time interval (K2), the gNB 122 may select the first SRS transmission occasion before the occasions of the CSl-RSs resources.

[0066] Alternatively, at step 408, in response to determining that the first time interval (Ki) is greater than the determined second time interval (K ). the gNB 122 may select the second SRS transmission occasion after the occasions of the CSI-RSs resources.

[0067] FIG. 5 illustrates an embodiment of a device / apparatus 500 in accordance with an embodiment of the present disclosure. As shown in FIG. 5, the device 500 includes a processor 510, a memory 520, a storage component 530, an input component 540, an output component 550, a communication interface 560, and a bus 570. The device 500 may be associated with the UE 110. In one embodiment, the device 500 may correspond to the gNB 122. The one or more components of the device 500 may be configured to implement one or more operations / functionalities of the present disclosure as discussed above.

[0068] The processor 510, as used herein, means any type of computational circuit that may comprise hardware elements and software elements. The processor 510 may be embodied as a multi-core processor, a single core processor, or a combination of one or more multi-core processors and / or one or more single core processors, a distributed processing system, or the like. The processor 510 may be a Central Processing Unit (CPU), a graphics processing unit (GPU), an accelerated processing unit (APU), an application-specific integrated circuit (ASIC), or another type of processing component.

[0069] The memory 520 includes a non-transitory computer readable medium. The memory' 520 includes a random-access memory' (RAM), a read only memory' (ROM), and / or another ty pe of dynamic or static storage device (e.g., a flash memory', a magnetic memory', and / or anoptical me mon ) that stores information and / or instructions for use by the processor 510. The memory 520 comprises machine-readable instructions which are executable by the processor 510. These machine-readable instructions when executed by the processor 510 cause the processor 510 to perform one or more method steps of an embodiment described above.

[0070] The storage component 530 stores information and / or software related to the operation and use of the device 500. For example, the storage component 530 may include a hard disk (e.g., a magnetic disk, an optical disk, a magneto-optic disk, and / or a solid-state disk), a compact disc (CD), a digital versatile disc (DVD), a floppy disk, a cartridge, a magnetic tape, and / or another t pe of non-transitory computer-readable medium, along with a corresponding drive.

[0071] The input component 540 is configured to receive information, such as user input. For example, the input component 540 may include, but not be limited to. a touch screen display, a keyboard, a keypad, a mouse, a button, a switch, and / or a microphone. Additionally, or alternatively, the input component 540 may include a sensor for sensing information (e.g., a global positioning system (GPS), an accelerometer, a gyroscope, and / or an actuator).

[0072] The output component 550 is configured to provide output information from the device 500. For example, the output component 550 may be, but not limited to, a display, a speaker, an instruction device to an external device, and / or one or more light-emitting diodes (LEDs).

[0073] The communication interface 560 is an interface that provides a communication connection to other devices, such as external devices and internal devices. The connection by the communication interface 560 may be a wired connection, a wireless connection, or a combination of wired and wireless connections, and may be a direct connection or an indirect connection via a communication network that exists between the device 500 and other devices. In other words, the standard of the communication interface 560 is not limited.

[0074] The bus 570 acts as an interconnect between the processor 510, the memory 520, the storage component 530, the input component 540, the output component 550, and the communication interface 560 of the device 500. The bus 570 may include a wired interconnection or a wireless interconnection.

[0075] The number and arrangement of components shown in FIG. 5 are provided as an example. In practice, device 500 may include additional components, fewer components, different components, or differently arranged components than those shown in FIG. 5. Additionally, or alternatively, a set of components (e.g., one or more components) of the device 500 may perform one or more functions described as being performed by another set of components of the device 500. Further, one or more method steps described in any of the embodiments may be performed utilizing a plurality of devices 500 in communication with one another.

[0076] Examples of the techniques and apparatus described herein include, but are not limited to, the following enumerated embodiments:[1] An apparatus configured to:determine a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion before occasions of Channel State Information- Reference Signals (CSI-RSs) resources, and a first symbol of the occasions of the CSI-RSs resources; determine a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a second SRS transmission occasion after the occasions of the CSI-RSs resources; andselect either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.[2] The apparatus as described in [1], wherein to select either the first or second SRS transmission occasion, the apparatus is configured to:compare the determined first time interval and the determined second time interval: determine whether the first time interval is less than the determined second time interval based on the comparison of the determined first time interval and the determined second time interval;in response to determining that the first time interval is less than the determined second time interval, select the first SRS transmission occasion before the occasions of the CSI-RSs resources; andin response to determining that the first time interval is greater than the determined second time interval select the second SRS transmission occasion after the occasions of the CSI-RSs resources.[3] The apparatus as described in any of [1] or [2], wherein the occasions of the CSI-RSs resources correspond to CSI-RSs transmission from a number of Transmit and Receive Points (TRPs) associated with the reference UE antenna port associated with the corresponding UE.[4] The apparatus as described in any of

[0001] - [3] , wherein the occasions of the CSI-RSs resources indicate the corresponding UE to measure phase offsets among the number of TRPs.[5] The apparatus as described in any of [l]-[4], wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion afterthe occasions of the CSI-RSs resources corresponds to a corresponding reception of the SRSs by the apparatus from the corresponding UE.[6] The apparatus as described in any of [l]-[5], wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur periodically based on a pre-configured time interval.[7] The apparatus as described in any of [l]-[6], wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur aperiodically.[8] The apparatus as described in any of [l]-[7], wherein the first SRS transmission occasion corresponds to a latest SRS transmission occasion before the occasions of the CSI-RSs resources, and the second SRS transmission occasion corresponds to an earliest SRS transmission occasion after the occasions of the CSI-RSs resources.[9] The apparatus as described in any of [l]-[8], wherein the CSI-RSs resources correspond to NTRP CSI-RSS resources.

[0010] The apparatus as described in any of [l]-[9], wherein the apparatus corresponds to a gNodeB (gNB).

[0011] A method comprising:determining, by a gNodeB (gNB), a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion before occasions of Channel State Information- Reference Signals (CSI-RSs) resources, and a first symbol of the occasions of the CSI-RSs resources;determining, by the gNB, a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a first SRS transmission occasion after the occasions of the CSI-RSs resources; andselecting, by the gNB, either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

[0012] The method as described in

[0011] , wherein selecting either the first or second SRS transmission occasion comprises:comparing, by the gNB, the determined first time interval and the determined second time interval;determining, by the gNB, whether the first time interval is less than the determined second time interval based on the comparison of the determined first time interval and the determined second time interval;in response to determining that the first time interval is less than the determined second time interval, selecting, by the gNB, the first SRS transmission occasion before the occasions of the CSI-RSs resources; andin response to determining that the first time interval is greater than the determined second time interval, selecting, by the gNB, the second SRS transmission occasion after the occasions of the CSI-RSs resources.

[0013] The method as described in any of

[0011] or

[0012] , wherein the occasions of the CSI-RSs resources correspond to CSI-RSs transmission from a number of Transmit and Receive Points (TRPs) associated with the reference UE antenna port associated with the corresponding UE.

[0014] The method as described in any of

[0011] -

[0013] , wherein the occasions of the CSI-RSs resources indicate the corresponding UE to measure phase offsets among the number of TRPs.

[0015] The method as described in any of

[0011] -

[0014] , wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources corresponds to a corresponding reception of the SRSs by the apparatus from the corresponding UE.

[0016] The method as described in any of

[0011] -

[0015] , wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur periodically based on a pre-configured time interval.

[0017] The method as described in any of

[0011] -

[0016] , wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur aperiodically.

[0018] The method as described in any of

[0011] -

[0017] , wherein the first SRS transmission occasion corresponds to a latest SRS transmission occasion before the occasions of the CSI-RSs resources, and the second SRS transmission occasion corresponds to an earliest SRS transmission occasion after the occasions of the CSI-RSs resources.

[0019] The method as described in any of

[0011] -

[0018] , wherein the CSI-RSs resources correspond to NTRP CSI-RSs resources.

[0020] A non-transitory computer-readable medium storing instructions, the instructions comprising: one or more instructions that, when executed by a gNodeB (gNB), the gNB comprising one or more processors, cause the one or more processors to:determine a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion before occasions of Channel State Information-Reference Signals (CSI-RSs) resources, and a first symbol of the occasions of the CSI-RSs resources;determine a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a second SRS transmission occasion after the occasions of the CSI-RSs resources; andselect either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

[0077] The embodiments disclosed herein may be implemented through at least one software program running on at least one hardware device and performing network management functions to control the elements. The elements may be at least one of a hardware device or a combination of hardware devices and software modules. The gNB and the UE may include respective processors, communication units, and storage units (e.g., memory). The communication units may perform functions for transmitting and receiving signals. The storage units may include executable instructions that, when executed by the corresponding processors, cause the corresponding gNB and the UE to perform the functions as described above with reference to FIGS. 1-4.

[0078] While specific language has been used to describe the disclosure, any limitations arising on account of the same are not intended. As would be apparent to a person in the art, various working modifications may be made to the method in order to implement the inventive concept as taught herein.

[0079] The drawings and the forgoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. For example, orders of processes described herein may be changed and are not limited to the manner described herein.

[0080] Moreover, the actions of any flow diagram need not be implemented in the order shown; nor do all of the acts necessarily be performed. Also, those acts that are not dependent on other acts may be performed in parallel with the other acts. The scope of embodiments is by no means limited by these specific examples. Numerous variations, whether explicitly given in the specification or not, such as differences in structure, dimension, and use of material, are possible. The scope of embodiments is at least as broad as given by the following claims.

[0081] Benefits, other advantages, and solutions to problems have been described above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any component(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature or component of any or all the claims.

[0082] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and / or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and / or modifications may be intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology7or terminology' employed herein is for the purposeof description and not of limitation. Therefore, while the embodiments herein have been described in terms of at least one embodiment, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

Claims

WE CLAIM:

1. An apparatus configured to:determine a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion before occasions of Channel State Information- Reference Signals (CSI-RSs) resources, and a first symbol of the occasions of the CSI-RSs resources: determine a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a second SRS transmission occasion after the occasions of the CSI-RSs resources; andselect either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

2. The apparatus as claimed in claim 1, wherein to select either the first or second SRS transmission occasion, the apparatus is configured to:compare the determined first time interval and the determined second time interval; determine whether the first time interval is less than the determined second time interval based on the comparison of the determined first time interval and the determined second time interval;in response to determining that the first time interval is less than the determined second time interval, select the first SRS transmission occasion before the occasions of the CSI-RSs resources; andin response to determining that the first time interval is greater than the determined second time interval, select the second SRS transmission occasion after the occasions of the CSl-RSs resources.

3. The apparatus as claimed in claim 1, wherein the occasions of the CSI-RSs resources correspond to CSI-RSs transmission from a number of Transmit and Receive Points (TRPs) associated with the reference UE antenna port associated with the corresponding UE.

4. The apparatus as claimed in claim 3, wherein the occasions of the CSI-RSs resources indicate the corresponding UE to measure phase offsets among the number of TRPs.

5. The apparatus as claimed in claim 1, wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources corresponds to a corresponding reception of the SRSs by the apparatus from the corresponding UE.

6. The apparatus as claimed in claim 1 , wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur periodically based on a pre-configured time interval.

7. The apparatus as claimed in claim 1, wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur aperiodically.

8. The apparatus as claimed in claim 1, wherein the first SRS transmission occasion corresponds to a latest SRS transmission occasion before the occasions of the CSI-RSs resources, and the second SRS transmission occasion corresponds to an earliest SRS transmission occasion after the occasions of the CSI-RSs resources.

9. The apparatus as claimed in claim 1 , wherein the CSI-RSs resources correspond to NTRP CSI-RSs resources.

10. The apparatus as claimed in claim 1, wherein the apparatus corresponds to a gNodeB (gNB).

11. A method comprising:determining, by a gNodeB (gNB), a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion before occasions of Channel State Information- Reference Signals (CSI-RSs) resources, and a first symbol of the occasions of the CSI-RSs resources;determining, by the gNB. a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a first SRS transmission occasion after the occasions of the CSI-RSs resources; andselecting, by the gNB, either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

12. The method as claimed in claim 11, wherein selecting either the first or second SRS transmission occasion comprises:comparing, by the gNB, the determined first time interval and the determined second time interval;determining, by the gNB, whether the first time interval is less than the determined second time interval based on the comparison of the determined first time interval and the determined second time interval;in response to determining that the first time interval is less than the determined second time interval, selecting, by the gNB. the first SRS transmission occasion before the occasions of the CSI-RSs resources; andin response to determining that the first time interval is greater than the determined second time interval, selecting, by the gNB, the second SRS transmission occasion after the occasions of the CSI-RSs resources.

13. The method as claimed in claim 11, wherein the occasions of the CSI-RSs resources correspond to CSI-RSs transmission from a number of Transmit and Receive Points (TRPs) associated with the reference UE antenna port associated with the corresponding UE.

14. The method as claimed in claim 13, wherein the occasions of the CSI-RSs resources indicate the corresponding UE to measure phase offsets among the number of TRPs.

15. The method as claimed in claim 11, wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after theoccasions of the CSI-RSs resources corresponds to a corresponding reception of the SRSs by the apparatus from the corresponding UE.

16. The method as claimed in claim 11, wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur periodically based on a pre-configured time interval.

17. The method as claimed in claim 11, wherein the first SRS transmission occasion before the occasions of the CSI-RSs resources and the second SRS transmission occasion after the occasions of the CSI-RSs resources occur aperiodically.

18. The method as claimed in claim 11, wherein the first SRS transmission occasion corresponds to a latest SRS transmission occasion before the occasions of the CSI-RSs resources, and the second SRS transmission occasion corresponds to an earliest SRS transmission occasion after the occasions of the CSI-RSs resources.

19. The method as claimed in claim 11, wherein the CSI-RSs resources correspond to NTRP CSI-RSs resources.

20. A non-transitory computer-readable medium storing instructions, the instructions comprising: one or more instructions that, when executed by a gNodeB (gNB), the gNB comprising one or more processors, cause the one or more processors to:determine a first time interval between a last symbol of a first Sounding Reference Signal (SRS) transmission occasion before occasions of Channel StateInformation-Reference Signals (CSI-RSs) resources, and a first symbol of the occasions of the CSI-RSs resources;determine a second time interval between a last symbol of the occasions of the CSI-RSs resources and a first symbol of a second SRS transmission occasion after the occasions of the CSI-RSs resources; andselect either the first or second SRS transmission occasion for identifying a reference User Equipment (UE) antenna port associated with a corresponding UE based on the determined first time interval and the second time interval.

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