Antenna port resource configuration

Abstract

There are provided measures for antenna port resource configuration. Such measures exemplarily comprise receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.

Description

[0001]TitleAntenna port resource configurationFieldVarious example embodiments relate to antenna port resource configuration.More specifically, various example embodiments exemplarily relate tomeasures (including methods, apparatuses and computer program products) for realizing antenna port resource configuration. Background The present specification generally relates to facilitation of utilization of antenna arrays including a plurality of (physical) antenna elements and (logical) antenna ports.Namely, to address uplink / downlink coverage issues, for example for new 3rdGeneration Partnership Project (3GPP) 6th Generation (6G) frequency bands(e.g., 6.425-7.125 GHz and 7-24 GHz), the use of larger antenna arrays(larger compared to Rel-15) with an increased number of antenna elementsand antenna ports at transmission and reception side are required. The use of large antenna arrays can enable enhanced coverage and spectrum efficiency in both uplink and downlink. Such increased number of antenna elements and antenna ports at transmission and reception side necessitates control and configuration of resources mapped thereto.Hence, the problem arises that control and configuration of resources mappedto in particular antenna ports is to be provided. Hence, there is a need to provide for antenna port resource configuration. Various example embodiments aim at addressing at least part of the above issues and / or problems and drawbacks. Various aspects of example embodiments are set out in the appended claims. According to an exemplary aspect, there is provided a method, comprising receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antennaports and a second antenna port of said plurality of antenna ports arecoherent in phase and / or amplitude domain. According to an exemplary aspect, there is provided a method, comprising determining a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting said resource configuration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain. According to an exemplary aspect, there is provided an apparatus, comprising receiving circuitry configured to receive a resource configuration configuring at least one sounding reference signal resource associated with a plurality oflogical antenna ports assignable to physical antenna elements of an antennaarray, and transmitting circuitry configured to transmit a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource isconfigured by combinations of comb offset values and cyclic shift values, eachcombination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain. According to an exemplary aspect, there is provided an apparatus, comprising determining circuitry configured to determine a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting circuitry configured to transmit said resource configuration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain. According to an exemplary aspect, there is provided an apparatus, comprising at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain. According to an exemplary aspect, there is provided an apparatus, comprising at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform determining a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting said resource configuration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain. According to an exemplary aspect, there is provided a computer program product comprising computer-executable computer program code which, when the program is run on a computer (e.g. a computer of an apparatus according to any one of the aforementioned apparatus-related exemplary aspects of the present disclosure), is configured to cause the computer to carry out the method according to any one of the aforementioned method- related exemplary aspects of the present disclosure. Such computer program product may comprise (or be embodied) a (tangible) computer-readable (storage) medium or the like on which the computer- executable computer program code is stored, and / or the program may bedirectly loadable into an internal memory of the computer or a processorthereof. Any one of the above aspects enables an efficient control and configuration of resources mapped to in particular antenna ports to thereby solve at leastpart of the problems and drawbacks identified in relation to the prior art. Inparticular, as a concrete example, by enabling support for UL SRS resource configuration with higher number of antenna ports, higher number of antenna ports can be efficiently utilized in 6G to enhance UL spectral efficiency and coverage with respect to New Radio (NR). By way of example embodiments, there is provided antenna port resource configuration. More specifically, by way of example embodiments, there are provided measures and mechanisms for realizing antenna port resource configuration. Thus, improvement is achieved by methods, apparatuses and computer program products enabling / realizing antenna port resource configuration. Brief description of the drawings In the following, the present disclosure will be described in greater detail by way of non-limiting examples with reference to the accompanying drawings, in whichFIG. 1 is a block diagram illustrating an apparatus according to exampleembodiments,FIG. 2 is a block diagram illustrating an apparatus according to exampleembodiments, FIG. 3 is a block diagram illustrating an apparatus according to example embodiments, FIG. 4 is a block diagram illustrating an apparatus according to example embodiments,FIG. 5 is a schematic diagram of a procedure according to exampleembodiments,FIG. 6 is a schematic diagram of a procedure according to exampleembodiments,FIG. 7 shows a schematic diagram of an example of a resource configurationfor antenna ports according to example embodiments,FIG. 8 shows a schematic diagram of an example of a resource configuration for antenna ports according to example embodiments, FIG. 9 shows a schematic diagram of an example of a resource configuration for antenna ports according to example embodiments, FIG. 10 shows a schematic diagram of an example of a resource configuration for antenna ports according to example embodiments, FIG. 11 shows a schematic diagram of an example of a resource configurationfor antenna ports according to example embodiments, andFIG. 12 is a block diagram alternatively illustrating apparatuses according toexample embodiments. Detailed description The present disclosure is described herein with reference to particular non- limiting examples and to what are presently considered to be conceivable embodiments. A person skilled in the art will appreciate that the disclosure is by no means limited to these examples, and may be more broadly applied. It is to be noted that the following description of the present disclosure and its embodiments mainly refers to specifications being used as non-limiting examples for certain exemplary network configurations and deployments. Namely, the present disclosure and its embodiments are mainly described in relation to 3GPP specifications being used as non-limiting examples forcertain exemplary network configurations and deployments. As such, thedescription of example embodiments given herein specifically refers to terminology which is directly related thereto. Such terminology is only used in the context of the presented non-limiting examples, and does naturally notlimit the disclosure in any way. Rather, any other communication orcommunication related system deployment, etc. may also be utilized as long as compliant with the features described herein. Hereinafter, various embodiments and implementations of the present disclosure and its aspects or embodiments are described using several variants and / or alternatives. It is generally noted that, according to certain needs and constraints, all of the described variants and / or alternatives may be provided alone or in any conceivable combination (also including combinations of individual features of the various variants and / or alternatives). As used herein, "at least one of the following: " and "at least one of " and similar wording, where the list of two or more elements are joined by "and" or "or", mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements. According to example embodiments, in general terms, there are provided measures and mechanisms for (enabling / realizing) antenna port resource configuration. Known specifications support up to 24 antenna ports for demodulation reference signal (DMRS) and up to 8 antenna ports for uplink (UL) sounding reference signal (SRS) resource with different usages, i.e. codebook and antenna-switching. This may prevent efficient utilization of larger antenna arrays for coverage and spectral efficient enhancement purposes at user equipments (UE). An SRS resource may be configured by an SRS-Resource information element (IE) or the SRS-PosResource IE and may consist of:- ^apSRS ∈ {1,2,4,8} antenna ports {^^}^=0 ^apSRS−1, where the number ofantenna ports is given by the higher layer parameter nrofSRS-Ports ifconfigured, otherwise ^apSRS = 1, and ^^ = 1000 + ^ when the SRS resourceis in a SRS resource set with higher-layer parameter "usage" in SRS- ResourceSet not set to 'nonCodebook', or otherwise determined when the SRS resource is in a SRS resource set with higher-layer parameter "usage" in SRS-ResourceSet set to 'nonCodebook';- ^symbSRS ∈ {1,2,4,8,10,12,14} consecutive Orthogonal FrequencyDivision Multiplex (OFDM) symbols given by the field nrofSymbols contained in the higher layer parameter resourceMapping;- ^0, the starting position in the time domain given by ^0=^symbslot−1−^offsetwhere the offset ^offset ∈ {0,1,…,13} counts symbols backwards from the endof the slot and is given by the field startPosition contained in the higher layer parameter resourceMapping and ^offset≥^symbSRS−1;- ^0, the frequency-domain starting position of the sounding reference signal.The cyclic shift ^^ for antenna port ^^ is given aswhere ^SRScs ∈ {0,1,…,^SRScs,max−1} is contained in the higher layerparameter transmissionComb. The maximum number of cyclic shifts ^SRScs,maxmay be given by the following table (Maximum number of cyclic shifts^SRScs,maxas a function of ^TC): The quantities ^^̅ and ^̅apSRS are given by- if the higher-layer parameter nrofSRS-Ports-n8 equals ports8tdm: -otherwise The frequency-domain starting position ^0(^^)is defined by The following SRS parameters may be semi-statically configurable by higher layer parameter SRS-Resource or SRS-PosResource:- srs-ResourceId or SRS-PosResourceId determines SRS resourceconfiguration identity;- Number of SRS ports, as defined by the higher layer parameter nrofSRS-Ports and otherwise described; If not configured, nrofSRS-Ports is 1;- Support of time division mapping subsets of ports of the SRS resource intoS symbols (S=2), as defined by the higher layer parameter [tdm], where the SRS ports are evenly distributed in two symbols; This applies when the SRS resource set is configured with higher layer parameter "usage" in SRS- ResourceSet set to ‘codebook’, or ‘antennaSwitching’, and nrofSRS-Ports is set to ‘n8’;- Comb offset hopping pattern with repetition, as defined by the higher layerparameter [combOffsetHoppingWithRepetition], where the parameter can be set to either ‘[per-symbol]’ or ‘[per-R-repetition]’ subject to UE capability; When the parameter is set to ‘[per-symbol]’, the comb offset hopping pattern is determined by the symbol index, and the comb offset hopping pattern is determined by the symbol index of the first symbol of the repetition when the parameter is set to ‘[per-R-repetition]’;- Cyclic shift, as defined by the higher layer parameter cyclicShift-n2,cyclicShift-n4, or cyclicShift-n8 for transmission comb value 2, 4 or 8, and otherwise described; When cyclic shift hopping is configured by the higher layer parameter [cyclicShiftHopping] for an SRS resource in an SRS resource set with the "usage" configured as 'antennaSwitching', subject to UE capabilities, cyclic shift is updated at every symbol; For the cyclic shift hopping, a UE can be configured with a subset of cyclic shifts by the higher layer parameter [cyclicShiftHoppingSubset], where the cyclic shift hopping is performed only across the cyclic shifts configured in the subset; The UE is not expecting that the cyclic shift hopping and the higher layer parameter [tdm] are configured simultaneously. Higher peak data rate for UL could play a significant role in short-range applications such as home entertainment, video surveillance / monitoring in industrial / healthcare / safety, integrated access and backhaul (IAB), and other applications, where devices power / form-factor / cost are not as stringent as in traditional handheld devices. The use of larger antenna arrays, in terms of physical antenna elements and logical antenna ports, can be used in e.g. 6G to enable enhanced uplink coverage and spectral efficiency with new and existing frequency bands. By introducing specification support for UL transmission with >8Tx antenna ports can be used to bridge the gap between downlink (DL) and UL spectral efficiency in 6G, especially with customer premise equipment (CPE) / fixedwireless access (FWA) / vehicle / industrial devices. One key component for enabling specification support for the use of larger antenna arrays in 6G is to introduce new UL SRS resource configurations and corresponding UE transmission procedures with higher number of antenna ports >8, where 8 being the maximum value supported by new radio (NR). Known specifications do not provide any such possibility. There is a need to enable support, in terms of UL SRS resource configuration and UE transmission procedure, for high number of UL SRS antenna ports.Hence, in brief, according to example embodiments, an uplink (UL) soundingreference signal (SRS) resource configuration with / for a high number of antenna ports (in particular more than 8 antenna ports (AP)) is provided, where UL SRS resource can be configured with at least one of the following information elements: -new comb-types, e.g. "comb-12", "comb-16",- new cyclic-shift value mapping types, e.g. "non-uniform",- new cyclic shift lengths,- new mappings between comb-offset values, cyclic-shift values and ULSRS antenna ports, -new information element defining coherency of associated antennaports in terms of phase and / or amplitude (among the antenna ports), e.g. -"full-Phase-Coherency",- "full-Amplitude-Coherency",- "full-PhaseAndAmplitude-Coherency",- "partial-Phase-Coherency",- "partial-Amplitude-Coherency",- "partial-PhaseAndAmplitude-Coherency",- "none-PhaseAndAmplitude-Coherency", and- number of coherency groups.Example embodiments are specified below in more detail.FIG. 1 is a block diagram illustrating an apparatus according to exampleembodiments. The apparatus may be a terminal 10 such as a user equipmentcomprising a receiving circuitry 11 and a transmitting circuitry 12. Thereceiving circuitry 11 receives a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array. The transmitting circuitry 12 transmits a sounding reference signal on said sounding reference signal resource based on said resource configuration.Here, said at least one sounding reference signal resource is configured bycombinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports. Further, a first antenna port of said plurality of antenna ports and a second antennaport of said plurality of antenna ports are coherent in phase and / or amplitudedomain. FIG. 5 is a schematic diagram of a procedure according to exampleembodiments. The apparatus according to FIG. 1 may perform the method ofFIG. 5 but is not limited to this method. The method of FIG. 5 may beperformed by the apparatus of FIG. 1 but is not limited to being performedby this apparatus.As shown in FIG. 5, a procedure according to example embodimentscomprises an operation of receiving (S51) a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and an operation of transmitting (S52) a sounding reference signal on said sounding reference signal resource based on said resource configuration. Here, said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports. Further, a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.FIG. 2 is a block diagram illustrating an apparatus according to exampleembodiments. In particular, FIG. 2 illustrates a variation of the apparatusshown in FIG. 1. The apparatus according to FIG. 2 may thus further comprisea determining circuitry 21.In an embodiment at least some of the functionalities of the apparatus shownin FIG. 1 (or 2) may be shared between two physically separate devicesforming one operational entity. Therefore, the apparatus may be seen to depict the operational entity comprising one or more physically separate devices for executing at least some of the described processes. According to further example embodiments, said first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, and said first comb offset value and said second comb offset value are the same. In other words, the same comb offset value is shared by two antenna ports which are coherent in phase and / or amplitude domain. Namely, coherent antenna ports can be (more easily) kept orthogonal in cyclic shift domain (i.e. to have the same time and frequency resource, i.e. the same comb-offset, while ports are separated by different cyclic shifts) compared to non-coherent antenna ports. Hence, while non-coherent antenna ports should be separated by different comb offsets, advantageously, coherent antenna ports can share the same comb offsets. According to a variation of the procedure shown in FIG. 5, exemplary additional operations and exemplary details of the transmitting operation (S52) are given, which are inherently independent from each other as such. According to such variation, an exemplary method according to example embodiments may comprise an operation of determining an antenna port mapping between said comb offset values, said cyclic shift values, and saidplurality of antenna ports, based on said resource configuration. Further, suchexemplary transmitting operation (S52) according to example embodiments may comprise an operation of determining said sounding reference signal resource based on said antenna port mapping. According to further example embodiments, said plurality of logical antenna ports includes at least 9 antenna ports. According to further example embodiments, a number of said comb offset values is higher than 8. According to further example embodiments, at least one comb offset value of said comb offset values is higher than 8. According to further example embodiments, a number of said cyclic shift values is higher than 12. According to further example embodiments, at least one cyclic shift value of said cyclic shift values is higher than 12. According to further example embodiments, said resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain. According to further example embodiments, said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain. According to further example embodiments, said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain. According to further example embodiments, said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain. According to further example embodiments, said coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain. According to further example embodiments, said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain. According to further example embodiments, said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain. According to a variation of the procedure shown in FIG. 5, exemplary additional operations are given, which are inherently independent from each other as such. According to such variation, an exemplary method according to example embodiments may comprise an operation of determining a sounding reference signal transmission utilizing more than one logical antenna port of said plurality of logical antenna ports based on said coherency information. According to further example embodiments, said resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports. According to further example embodiments, said at least one sounding reference signal resource is a time, frequency, and code domain resource. According to a variation of the procedure shown in FIG. 5, exemplary details of the receiving operation (S51, receiving said resource configuration) are given, which are inherently independent from each other as such. Such exemplary receiving operation (S51, receiving said resource configuration) according to example embodiments may comprise an operation of receiving a resource set configuration for at least one sounding reference signal set including said at least one sounding reference signal resource. According to a variation of the procedure shown in FIG. 5, exemplary additional operations are given, which are inherently independent from each other as such. According to such variation, an exemplary method according to example embodiments may comprise an operation of transmitting information on own hardware capabilities. FIG. 3 is a block diagram illustrating an apparatus according to example embodiments. The apparatus may be a network node 10 such as a base station (e.g. a gNB) comprising a determining circuitry 31 and a transmitting circuitry 32. The determining circuitry 31 determines a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array. The transmitting circuitry 32 transmits said resource configuration towards said terminal. Here, said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports. Further, a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain. FIG. 6 is a schematic diagram of a procedure according to example embodiments. The apparatus according to FIG. 3 may perform the method of FIG. 6 but is not limited to this method. The method of FIG. 6 may be performed by the apparatus of FIG. 3 but is not limited to being performed by this apparatus. As shown in FIG. 6, a procedure according to example embodiments comprises an operation of determining (S61) a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna portsassignable to physical antenna elements of an antenna array, and anoperation of transmitting (S62) said resource configuration towards said terminal. Here, said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports. Further, a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.FIG. 4 is a block diagram illustrating an apparatus according to exampleembodiments. In particular, FIG. 4 illustrates a variation of the apparatusshown in FIG. 3. The apparatus according to FIG. 4 may thus further comprisea receiving circuitry 41.In an embodiment at least some of the functionalities of the apparatus shownin FIG. 3 (or 4) may be shared between two physically separate devicesforming one operational entity. Therefore, the apparatus may be seen to depict the operational entity comprising one or more physically separate devices for executing at least some of the described processes. According to further example embodiments, said first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, and said first comb offset value and said second comb offset value are same. In other words, the same comb offset value is shared by two antenna ports which are coherent in phase and / or amplitude domain. Namely, coherent antenna ports can be (more easily) kept orthogonal in cyclic shift domain (i.e. to have the same time and frequency resource, i.e. the same comb-offset, while ports are separated by different cyclic shifts) compared to non-coherent antenna ports. Hence, while non-coherent antenna ports should be separated by different comb offsets, advantageously, coherent antenna ports can share the same comb offsets. According to further example embodiments, said plurality of logical antenna ports includes at least 9 antenna ports. According to further example embodiments, a number of said comb offset values is higher than 8. According to further example embodiments, at least one comb offset value of said comb offset values is higher than 8. According to further example embodiments, a number of said cyclic shift values is higher than 12. According to further example embodiments, at least one cyclic shift value of said cyclic shift values is higher than 12. According to further example embodiments, said resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain. According to further example embodiments, said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain. According to further example embodiments, said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain. According to further example embodiments, said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain. According to further example embodiments, said coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain. According to further example embodiments, said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain. According to further example embodiments, said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain. According to further example embodiments, said resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports. According to further example embodiments, said at least one sounding reference signal resource is a time, frequency, and code domain resource. According to a variation of the procedure shown in FIG. 6, exemplary details of the transmitting operation (S62, transmitting said resource configuration) are given, which are inherently independent from each other as such. Such exemplary transmitting operation (S62, transmitting said resource configuration) according to example embodiments may comprise an operation of transmitting a resource set configuration for at least one sounding reference signal set including said at least one sounding reference signal resource. According to a variation of the procedure shown in FIG. 6, exemplary additional operations are given, which are inherently independent from each other as such. According to such variation, an exemplary method according to example embodiments may comprise an operation of receiving informationon hardware capabilities of said terminal. Here, said determining (S61) saidresource configuration is based on said hardware capabilities of said terminal. Example embodiments outlined and specified above are explained below in more specific terms. According to example embodiments, an UL SRS resource set and related resource configuration with high number of antenna ports (AP) >8 AP, for codebook and antenna-switching is defined as follows. According to example embodiments, the definition may include one or more of the following items: -A UE can be configured with one or more UL SRS resource sets whereone or more UL SRS resources is / are configured with high number of antenna ports (>8); -One or more UL SRS resources with comb-type KTC, where, KTC ≥1,can be configured with one or more comb-offset values kTC, where each comb-offset value is associated / mapped with a set of restricted cyclic- shift (CS) values with corresponding UL SRS antenna ports; -E.g. one or more cyclic shift values are associated with multiplecomb-offset values, e.g. comb-8, CSmax=12 and 16-APs, cyclic- shift value set 1 w / {0,3} mapped with kTC = {0,1,2,3,4,5,6,7}, <kTC = 0, CS=0, SRS-port=1000>,< kTC = 0, CS=3, SRS- port=1008>,…; -Restricted cyclic shift value set can be non-uniform or uniform sets(e.g. two comb-offsets) -For example, one comb-offset value set with non-uniform CSvalue set and another with uniform CS value set or one set with non-uniform and another with uniform or one set uniform and another uniform, any combination of those previous options is allowed) -E.g., the UE is configured with UL SRS resource with w / comb-4 (KTC =4) and comb-offset values kTC = {1,2,3,4} and non-uniform CS value set#1 = {0,2,6,11}; -One or more resources with different comb-types can be configuredwith higher number of Cyclic-shift values >12 -E.g., CSmax=24.According to example embodiments, an UL SRS resource in an UL SRS resource set can be configured with an information element defining coherency of associated antenna ports in terms of phase and / or amplitude (phase and amplitude coherency information is assumed to be obtained via capability signaling). The resource-specific coherency information can be one of the following: -‘full-Phase-Coherency’: associated antenna ports within the resourcefull-fill fully phase coherency assumption (i.e. amplitude coherency is not assumed); -‘full-Amplitude-Coherency’: associated antenna ports within theresource full-fill amplitude coherency assumption (i.e. phase coherencyis not assumed); -‘full-PhaseAndAmplitude-Coherency’: associated antenna ports withinthe resource full-fill both amplitude and phase coherency assumption;- ‘partial-Phase-Coherency’: one or more groups of antenna portsassociated within the resource full-fill(s) fully phase coherency assumption (i.e. amplitude coherency is not assumed), where phase coherency between different antenna port groups is not assumed;- ‘partial-Amplitude-Coherency’: one or more groups of antenna portsassociated within the resource full-fill(s) fully amplitude coherencyassumption (i.e. phase coherency is not assumed), where amplitude coherency between different antenna groups is not assumed; -‘partial-PhaseAndAmplitude-Coherency’: one or more groups ofantenna ports associated within the resource full-fill(s) fully both phaseand amplitude coherency assumption, where both phase and amplitude coherency between different antenna groups is not assumed; -‘no- Coherency’: none of antenna ports associated within the resourcefull-fills fully both phase and amplitude coherency assumption.Additionally, resource may be also configured with an information elementrelated to a number of coherency groups- E.g., number of groups is configured to 8; If the total number of totalantenna ports is e.g. 16, the number of antenna ports per group is total antenna ports divided by number of groups; In this example, aresult thereof is 2 SRS antenna ports per group.According to example embodiments, the above coherency information is defined UL SRS set specifically.According to example embodiments, the above SRS resource-specific or ULSRS resource set-specific information can be configured / re- configured / overwritten via higher layer signaling and / or MAC and / or layerone (L1)- signaling.FIG. 7 shows a schematic diagram of an example of a resource configuration for antenna ports according to example embodiments, and in particular illustrates an example of 16-AP UL SRS resource with KTC=8 and kTC= {1,2,3,4} for codebook and antenna-switching usages with 8 coherent antenna port groups, w / CS-max=12, CSRS =0, N=8 and w / restricted cyclic- shift set1. This example illustrates an exemplary 16-AP UL SRS resource configuration for codebook and antenna-switching usages with 8 coherent antenna port groups, where each group consist of two antenna ports, and maximum number of cyclic values is 12, and resource is configured with cyclic shift w / CSRSmax=12, CSRS =0, N=8, KTC=8 (=comb-8) with restricted cyclic-shift value set 1={0,3}. FIG. 8 shows a schematic diagram of an example of a resource configuration for antenna ports according to example embodiments, and in particular illustrates an example of 16-AP UL SRS resource configuration for codebook and antenna-switching usages with 1 coherent antenna port group w / restricted cyclic-shift sets 1. This example illustrates an exemplary 16AP UL SRS resource configuration with cyclic shift w / CSRSmax= 6, CSRS =0, N=4, KTC=8 (=comb-8) for codebook and antenna-switching usages with one coherency group with fully coherency in phase and amplitude of antenna ports with comb-offset values kTC={0,1,2,3,} with restricted cyclic-shift set 1. FIG. 9 shows a schematic diagram of an example of a resource configuration for antenna ports according to example embodiments, and in particular illustrates an example of 16-AP UL SRS resource configuration for codebook and antenna-switching usages with 4 coherent antenna port groups w / restricted cyclic-shift sets 1. This example illustrates an exemplary 16AP UL SRS resource configuration with cyclic shift w / CSRSmax= 6, CSRS =0, N=4, KTC=8 (=comb-8) for codebook and antenna-switching usages with 4 different coherency groups with partialcoherency of antenna ports with comb-offset values kTC={0,2,4,6} withrestricted cyclic-shift set 1. FIG. 10 shows a schematic diagram of an example of a resource configurationfor antenna ports according to example embodiments, and in particularillustrates an example of 24-AP UL SRS resource configuration for codebookand antenna-switching usages with 1 coherent antenna port group w / restricted cyclic-shift set 1.This example illustrates an exemplary 24-AP UL SRS resource configurationwith cyclic shift w / CSRSmax= 12, CSRS =0, N=6, KTC=12 (=comb-12) forcodebook and antenna-switching usages with one coherency group with fully coherency in phase and amplitude of antenna ports with comb-offset values kTC={0,1,2,3,4,5} with restricted cyclic-shift set 1. FIG. 11 shows a schematic diagram of an example of a resource configuration for antenna ports according to example embodiments, and in particular illustrates an example of 24-AP UL SRS resource configuration for codebook and antenna-switching usages with 4 coherent antenna port groups w / restricted cyclic-shift set 1. This example illustrates an exemplary 24-AP UL SRS resource configurationwith cyclic shift w / CSRSmax= 12, CSRS =0, N=6, KTC=12 (=comb-12) forcodebook and antenna-switching usages with 6 different coherency groupswith partial coherency in of antenna ports with comb-offset values kTC={0,2,4,6,8} with restricted cyclic-shift set 1. According to example embodiments, the above discussed configuration may be implemented / specified along the following exemplary code lines, for example for 6G: -- ASN1START-- TAG-SRS-CONFIG-START6G-SRS-Config ::= SEQUENCE { --void text --- 6G-SRS-Resource ::= SEQUENCE { srs-ResourceId SRS-ResourceId, nrofSRS-Ports ENUMERATED {port1, ports2, ports4},ptrs-PortIndex ENUMERATED {n0, n1 } OPTIONAL, -- Need Rcoherency CHOICE { full-Phase-Coherency, full-Amplitude-Coherency, full-PhaseAndAmplitude-Coherency, partial-Phase-Coherency, partial-Amplitude-Coherency, partial-PhaseAndAmplitude-Coherency, none-PhaseAndAmplitude-Coherency } Coherency-numberOfGroups ENUMERATED {n1, n2, n3,n4,n5,n6,n8,n12 } transmissionComb CHOICE { n2 SEQUENCE { combOffset-n2 INTEGER (0..1), cyclicShift-n2 INTEGER (0..7) cyclicShift-n24 INTEGER (0..23) }, n4 SEQUENCE { combOffset-n4 INTEGER (0..3), cyclicShift-n4 INTEGER (0..11) cyclicShift-n24 INTEGER (0..23) }, n8 SEQUENCE { combOffset-n8 INTEGER (0..7), cyclicShift-n6 INTEGER (0..5) cyclicShift-n12 INTEGER (0..11) cyclicShift-n24 INTEGER (0..23) }, n12 SEQUENCE { combOffset-n12 INTEGER (0..11), cyclicShift-n6 INTEGER (0..5) cyclicShift-n12- INTEGER (0..11)cyclicShift-n24 INTEGER (0..23) }, --void text --- } --void text --- ... } -- TAG-SRS-CONFIG-STOP-- ASN1STOPAccording to further example embodiments, the UE is configured with one or more UL SRS resource(s) with coherency information or, alternatively, one or more UL SRS resource set(s) with coherency information. Based on the configured coherency information, the UE shall determine its uplink SRS transmission with higher number of antenna ports accordingly as follows: -‘full-Phase-Coherency’: UE shall apply same RF / hardware configurationcovering also PA parameters) over one or more transmission occasions of UL SRS resource(s) such that full-phase coherency among antenna ports of antenna port group within resource(s) is maintained while UL SRS resource(s) are transmitted; -‘full-Amplitude-Coherency’: UE shall apply same RF / hardwareconfiguration covering also PA parameters) over one or more transmission occasions of UL SRS resource(s) such that full-amplitude coherency among antenna ports of antenna port group within resource(s) is maintained while UL SRS resource(s) are transmitted;- ‘full-PhaseAndAmplitude-Coherency’: UE shall apply sameRF / hardware configuration covering also PA parameters) over one or more transmission occasions of UL SRS resource(s) such that both full phase and amplitude coherency among antenna ports of antenna port group within resource(s) is maintained while UL SRS resource(s) are transmitted;- ‘partial-Phase-Coherency’: UE shall apply same RF / hardwareconfiguration covering also PA parameters) over one or more transmission occasions of UL SRS resource(s) such that partial phase coherency among antenna ports between different antenna port groups within resource(s) is maintained while UL SRS resource(s) are transmitted;- ‘partial-Amplitude-Coherency’: UE shall apply same RF / hardwareconfiguration covering also PA parameters) over one or more transmission occasions of UL SRS resource(s) such that partial amplitude coherency among antenna ports between different antenna port groups within resource(s) is maintained while UL SRS resource(s) are transmitted;- ‘partial-PhaseAndAmplitude-Coherency’: UE shall apply sameRF / hardware configuration covering also PA parameters) over one or more transmission occasions of UL SRS resource(s) such that both partial phase and amplitude coherency among antenna ports between different antenna port groups within resource(s) is maintained while UL SRS resource(s) are transmitted;- ‘no-Coherency’: UE shall not apply same RF / hardware configurationcovering also PA parameters) over one or more transmission occasions of UL SRS resource(s) such that any type of coherency among antenna ports between different antenna port groups within resource(s) is maintained while UL SRS resource(s) are transmitted. The above-described procedures and functions may be implemented by respective functional elements, processors, or the like, as described below. In the foregoing exemplary description of the network entity, only the units that are relevant for understanding the principles of the disclosure have been described using functional blocks. The network entity may comprise further units that are necessary for its respective operation. However, a description of these units is omitted in this specification. The arrangement of the functional blocks of the devices is not construed to limit the disclosure, and the functions may be performed by one block or further split into sub-blocks. When in the foregoing description it is stated that the apparatus, i.e. network entity (or some other means) is configured to perform some function, this is to be construed to be equivalent to a description stating that a (i.e. at least one) processor or corresponding circuitry, potentially in cooperation with computer program code stored in the memory of the respective apparatus, is configured to cause the apparatus to perform at least the thus mentioned function. Also, such function is to be construed to be equivalentlyimplementable by specifically configured circuitry or means for performingthe respective function (i.e. the expression “unit configured to" is construed to be equivalent to an expression such as “means for”).In FIG. 12, an alternative illustration of apparatuses according to exampleembodiments is depicted. As indicated in FIG. 12, according to exampleembodiments, the apparatus (terminal) 10’ (corresponding to the terminal10) comprises a processor 121, a memory 122 and an interface 123, whichare connected by a bus 124 or the like. Further, according to exampleembodiments, the apparatus (network node) 30’ (corresponding to thenetwork node 30) comprises a processor 125, a memory 126 and an interface127, which are connected by a bus 128 or the like, and the apparatuses maybe connected via link 129, respectively.The processor 121 / 125 and / or the interface 123 / 125 may also include amodem or the like to facilitate communication over a (hardwire or wireless) link, respectively. The interface 123 / 125 may include a suitable transceiver coupled to one or more antennas or communication means for (hardwire or wireless) communications with the linked or connected device(s), respectively. The interface 123 / 125 is generally configured to communicate with at least one other apparatus, i.e. the interface thereof.The memory 122 / 126 may store respective programs assumed to includeprogram instructions or computer program code that, when executed by the respective processor, enables the respective electronic device or apparatus to operate in accordance with the example embodiments. In general terms, the respective devices / apparatuses (and / or parts thereof) may represent means for performing respective operations and / or exhibiting respective functionalities, and / or the respective devices (and / or parts thereof) may have functions for performing respective operations and / or exhibiting respective functionalities. When in the subsequent description it is stated that the processor (or some other means) is configured to perform some function, this is to be construed to be equivalent to a description stating that at least one processor, potentially in cooperation with computer program code stored in the memory of the respective apparatus, is configured to cause the apparatus to perform at least the thus mentioned function. Also, such function is to be construed to be equivalently implementable by specifically configured means for performing the respective function (i.e. the expression “processor configured to [cause the apparatus to] perform xxx-ing” is construed to be equivalent to an expression such as “means for xxx-ing”). According to example embodiments, an apparatus representing the terminal10 comprises at least one processor 121, at least one memory 122 includingcomputer program code, and at least one interface 123 configured for communication with at least another apparatus. The processor (i.e. the atleast one processor 121, with the at least one memory 122 and the computerprogram code) is configured to perform receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array (thus the apparatus comprising corresponding means for receiving), and to perform transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain (thus the apparatus comprising corresponding means for transmitting). According to example embodiments, an apparatus representing the network node 30 comprises at least one processor 125, at least one memory 126 including computer program code, and at least one interface 127 configured for communication with at least another apparatus. The processor (i.e. the at least one processor 125, with the at least one memory 126 and the computer program code) is configured to perform determining a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array (thus the apparatus comprising corresponding means for determining), and to perform transmitting said resource configuration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain (thus the apparatus comprising corresponding means for transmitting). For further details regarding the operability / functionality of the individual apparatuses, reference is made to the above description in connection withany one of FIGs. 1 to 11, respectively.For the purpose of the present disclosure as described herein above, it should be noted that- method steps likely to be implemented as software code portions and beingrun using a processor at a network server or network entity (as examples of devices, apparatuses and / or modules thereof, or as examples of entities including apparatuses and / or modules therefore), are software code independent and can be specified using any known or future developed programming language as long as the functionality defined by the method steps is preserved;- generally, any method step is suitable to be implemented as software or byhardware without changing the idea of the embodiments and its modification in terms of the functionality implemented; -method steps and / or devices, units or means likely to be implemented ashardware components at the above-defined apparatuses, or any module(s) thereof, (e.g., devices carrying out the functions of the apparatuses according to the embodiments as described above) are hardware independent and canbe implemented using any known or future developed hardware technologyor any hybrids of these, such as MOS (Metal Oxide Semiconductor), CMOS (Complementary MOS), BiMOS (Bipolar MOS), BiCMOS (Bipolar CMOS), ECL (Emitter Coupled Logic), TTL (Transistor-Transistor Logic), etc., using for example ASIC (Application Specific IC (Integrated Circuit)) components, FPGA (Field-programmable Gate Arrays) components, CPLD (Complex Programmable Logic Device) components or DSP (Digital Signal Processor) components;- devices, units or means (e.g. the above-defined network entity or networkregister, or any one of their respective units / means) can be implemented as individual devices, units or means, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device, unit or means is preserved;- an apparatus like the user equipment and the network entity / networkregister may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of an apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution / being run on a processor;- a device may be regarded as an apparatus or as an assembly of more thanone apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example. In general, it is to be noted that respective functional blocks or elements according to above-described aspects can be implemented by any known means, either in hardware and / or software, respectively, if it is only adapted to perform the described functions of the respective parts. The mentioned method steps can be realized in individual functional blocks or by individual devices, or one or more of the method steps can be realized in a single functional block or by a single device. Generally, any method step is suitable to be implemented as software or by hardware without changing the idea of the present disclosure. Devices and means can be implemented as individual devices, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device is preserved. Such and similar principlesare to be considered as known to a skilled person.Software in the sense of the present description comprises software code as such comprising code means or portions or a computer program or a computer program product for performing the respective functions, as well as software (or a computer program or a computer program product) embodied on a tangible medium such as a computer-readable (storage) medium having stored thereon a respective data structure or code means / portions or embodied in a signal or in a chip, potentially during processing thereof. The present disclosure also covers any conceivable combination of method steps and operations described above, and any conceivable combination of nodes, apparatuses, modules or elements described above, as long as the above-described concepts of methodology and structural arrangement are applicable. In view of the above, there are provided measures for antenna port resource configuration. Such measures exemplarily comprise receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain. Even though the disclosure is described above with reference to the examples according to the accompanying drawings, it is to be understood that the disclosure is not restricted thereto. Rather, it is apparent to those skilled in the art that the present disclosure can be modified in many ways without departing from the scope of the inventive idea as disclosed herein. At least the following Items are covered by what is disclosed in the specification above: Item 1. A method, comprising receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.Item 2. The method according to Item 1, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, and said first comb offset value and said second comb offset value are the same.Item 3. The method according to Item 1 or 2, further comprisingdetermining an antenna port mapping between said comb offset values, said cyclic shift values, and said plurality of antenna ports, based on said resource configuration, and in relation to said transmitting, the method further comprises determining said sounding reference signal resource based on said antenna port mapping. Item 4. The method according to any of Items 1 to 3, wherein said plurality of logical antenna ports includes at least 9 antenna ports, and / or a number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12. Item 5. The method according to any of Items 1 to 4, wherein said resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain.Item 6. The method according to Item 5, whereinsaid coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 7. The method according to Item 5, whereinsaid coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain. Item 8. The method according to any of Items 5 to 7, further comprising determining a sounding reference signal transmission utilizing more than one logical antenna port of said plurality of logical antenna ports based on said coherency information. Item 9. The method according to any of Items 1 to 8, wherein said resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports. Item 10. The method according to any of Items 1 to 9, wherein said at least one sounding reference signal resource is a time, frequency, and code domain resource. Item 11. The method according to any of Items 1 to 10, wherein in relation to said receiving said resource configuration, the method further comprises receiving a resource set configuration for at least one sounding reference signal set including said at least one sounding reference signal resource. Item 12. The method according to any of Items 1 to 11, further comprising transmitting information on own hardware capabilities. Item 13. A method, comprising determining a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting said resource configuration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.Item 14. The method according to Item 13, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, andsaid first comb offset value and said second comb offset value are the same.Item 15. The method according to Item 13 or 14, whereinsaid plurality of logical antenna ports includes at least 9 antenna ports, and / or a number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12. Item 16. The method according to any of Items 13 to 15, wherein said resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain.Item 17. The method according to Item 16, whereinsaid coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 18. The method according to Item 16, whereinsaid coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain. Item 19. The method according to any of Items 13 to 18, wherein said resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports. Item 20. The method according to any of Items 13 to 19, wherein said at least one sounding reference signal resource is a time, frequency, and code domain resource. Item 21. The method according to any of Items 13 to 20, wherein in relation to said transmitting said resource configuration, the method further comprises transmitting a resource set configuration for at least one sounding reference signal set including said at least one sounding reference signal resource. Item 22. The method according to any of Items 13 to 21, further comprising receiving information on hardware capabilities of said terminal, wherein said determining said resource configuration is based on said hardware capabilities of said terminal.Item 23. An apparatus, comprisingreceiving circuitry configured to receive a resource configurationconfiguring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting circuitry configured to transmit a sounding referencesignal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift valuescorresponding to one antenna port of said plurality of antenna ports, andwherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.Item 24. The apparatus according to Item 23, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, and said first comb offset value and said second comb offset value are the same.Item 25. The apparatus according to Item 23 or 24, further comprisingdetermining circuitry configured todetermine an antenna port mapping between said comb offsetvalues, said cyclic shift values, and said plurality of antenna ports, based onsaid resource configuration, and todetermine said sounding reference signal resource based on saidantenna port mapping.Item 26. The apparatus according to any of Items 23 to 25, whereinsaid plurality of logical antenna ports includes at least 9 antenna ports, and / or a number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12.Item 27. The apparatus according to any of Items 23 to 26, whereinsaid resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain.Item 28. The apparatus according to Item 27, whereinsaid coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 29. The apparatus according to Item 27, whereinsaid coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 30. The apparatus according to any of Items 27 to 29, furthercomprising determining circuitry configured to determine a sounding referencesignal transmission utilizing more than one logical antenna port of said plurality of logical antenna ports based on said coherency information.Item 31. The apparatus according to any of Items 23 to 30, whereinsaid resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports.Item 32. The apparatus according to any of Items 23 to 31, whereinsaid at least one sounding reference signal resource is a time, frequency, and code domain resource.Item 33. The apparatus according to any of Items 23 to 32, furthercomprising receiving circuitry configured to receive a resource set configuration forat least one sounding reference signal set including said at least one sounding reference signal resource.Item 34. The apparatus according to any of Items 23 to 33, furthercomprising transmitting circuitry configured to transmit information on ownhardware capabilities.Item 35. An apparatus, comprisingdetermining circuitry configured to determine a resource configuration,for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting circuitry configured to transmit said resourceconfiguration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.Item 36. The apparatus according to Item 35, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, andsaid first comb offset value and said second comb offset value are the same.Item 37. The apparatus according to Item 35 or 36, whereinsaid plurality of logical antenna ports includes at least 9 antenna ports, and / or a number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12.Item 38. The apparatus according to any of Items 35 to 37, wherein said resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain.Item 39. The apparatus according to Item 38, whereinsaid coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 40. The apparatus according to Item 38, whereinsaid coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 41. The apparatus according to any of Items 35 to 40, whereinsaid resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports.Item 42. The apparatus according to any of Items 35 to 41, whereinsaid at least one sounding reference signal resource is a time, frequency, and code domain resource.Item 43. The apparatus according to any of Items 35 to 42, furthercomprisingtransmitting circuitry configured to transmit a resource setconfiguration for at least one sounding reference signal set including said at least one sounding reference signal resource.Item 44. The apparatus according to any of Items 35 to 43, furthercomprising receiving circuitry configured to receive information on hardwarecapabilities of said terminal, wherein said determining circuitry is configured to determine said resourceconfiguration is based on said hardware capabilities of said terminal.Item 45. An apparatus, comprisingat least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift valuescorresponding to one antenna port of said plurality of antenna ports, andwherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.Item 46. The apparatus according to Item 45, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, and said first comb offset value and said second comb offset value are the same.Item 47. The apparatus according to Item 45 or 46, whereinthe instructions, when executed by the at least one processor, cause the apparatus at least to perform: determining an antenna port mapping between said comb offset values, said cyclic shift values, and said plurality of antenna ports, based on said resource configuration, and in relation to said transmitting, the instructions, when executed by the at least one processor, cause the apparatus at least to perform: determining said sounding reference signal resource based on said antenna port mapping.Item 48. The apparatus according to any of Items 45 to 47, whereinsaid plurality of logical antenna ports includes at least 9 antenna ports, and / or a number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12.Item 49. The apparatus according to any of Items 45 to 48, whereinsaid resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain.Item 50. The apparatus according to Item 49, whereinsaid coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 51. The apparatus according to Item 49, whereinsaid coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 52. The apparatus according to any of Items 49 to 51, whereinthe instructions, when executed by the at least one processor, cause the apparatus at least to perform: determining a sounding reference signal transmission utilizing more than one logical antenna port of said plurality of logical antenna ports based on said coherency information.Item 53. The apparatus according to any of Items 45 to 52, whereinsaid resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports.Item 54. The apparatus according to any of Items 45 to 53, whereinsaid at least one sounding reference signal resource is a time, frequency, and code domain resource.Item 55. The apparatus according to any of Items 45 to 54, wherein in relation to said receiving said resource configuration, the instructions, when executed by the at least one processor, cause the apparatus at least to perform: receiving a resource set configuration for at least one sounding reference signal set including said at least one sounding reference signal resource.Item 56. The apparatus according to any of Items 45 to 55, whereinthe instructions, when executed by the at least one processor, cause the apparatus at least to perform: transmitting information on own hardware capabilities.Item 57. An apparatus, comprisingat least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: determining a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting said resource configuration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift valuescorresponding to one antenna port of said plurality of antenna ports, andwherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.Item 58. The apparatus according to Item 57, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, andsaid first comb offset value and said second comb offset value are the same.Item 59. The apparatus according to Item 57 or 58, whereinsaid plurality of logical antenna ports includes at least 9 antenna ports, and / or a number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12.Item 60. The apparatus according to any of Items 57 to 59, whereinsaid resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain.Item 61. The apparatus according to Item 60, whereinsaid coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 62. The apparatus according to Item 60, whereinsaid coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.Item 63. The apparatus according to any of Items 57 to 62, whereinsaid resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports.Item 64. The apparatus according to any of Items 57 to 63, whereinsaid at least one sounding reference signal resource is a time, frequency, and code domain resource.Item 65. The apparatus according to any of Items 57 to 64, whereinin relation to said transmitting said resource configuration, the instructions, when executed by the at least one processor, cause the apparatus at least to perform: transmitting a resource set configuration for at least one sounding reference signal set including said at least one sounding reference signal resource.Item 66. The apparatus according to any of Items 57 to 65, whereinthe instructions, when executed by the at least one processor, cause the apparatus at least to perform: receiving information on hardware capabilities of said terminal, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to perform said determining said resource configuration based on said hardware capabilities of said terminal. Item 67. A computer program product comprising computer-executable computer program code which, when the program is run on a computer, is configured to cause the computer to carry out the method according to any one of Items 1 to 12 or 13 to 22.Item 68. The computer program product according to Item 67, wherein thecomputer program product comprises a computer-readable medium on which the computer-executable computer program code is stored, and / or wherein the program is directly loadable into an internal memory of the computer or a processor thereof. List of acronyms and abbreviations3GPP Third Generation Partnership Project6G 6th GenerationAP antenna portCPE customer premise equipmentCS cyclic-shiftCSI-RS channel state information reference signalDL downlinkDMRS demodulation reference signalFWA fixed wireless accessIAB integrated access and backhaulIE information elementL1 layer oneMCS modulation and coding schemeNR New RadioOFDM Orthogonal Frequency Division MultiplexPBCH physical broadcast channelPDCCH physical downlink control channelPDSCH physical downlink shared channelPUSCH physical uplink shared channelQCL quasi co-locationSRS sounding reference signalSSB synchronization signal and PBCH blockTCI transmission configuration indicatorTRS tracking reference signalUE user equipmentUL uplink

Claims

Claims1. An apparatus, comprisingat least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving a resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting a sounding reference signal on said sounding reference signal resource based on said resource configuration, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.

2. The apparatus according to claim 1, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, and said first comb offset value and said second comb offset value are the same.

3. The apparatus according to claim 1 or 2, whereinthe instructions, when executed by the at least one processor, cause the apparatus at least to perform:determining an antenna port mapping between said comb offset values, said cyclic shift values, and said plurality of antenna ports, based on said resource configuration, and in relation to said transmitting, the instructions, when executed by the at least one processor, cause the apparatus at least to perform: determining said sounding reference signal resource based on said antenna port mapping.

4. The apparatus according to any of claims 1 to 3, whereinsaid plurality of logical antenna ports includes at least 9 antenna ports, and / or a number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12.

5. The apparatus according to any of claims 1 to 4, whereinsaid resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain.

6. The apparatus according to claim 5, whereinsaid coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of all logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.

7. The apparatus according to claim 5, whereinsaid coherency information defines coherency of a subset of logical antenna ports of said plurality of logical antenna ports in phase domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in amplitude domain, or said coherency information defines coherency of said subset of logical antenna ports of said plurality of logical antenna ports in phase and amplitude domain.

8. The apparatus according to any of claims 5 to 7, whereinthe instructions, when executed by the at least one processor, cause the apparatus at least to perform: determining a sounding reference signal transmission utilizing more than one logical antenna port of said plurality of logical antenna ports based on said coherency information.

9. The apparatus according to any of claims 1 to 8, whereinsaid resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports.

10. The apparatus according to any of claims 1 to 9, whereinsaid at least one sounding reference signal resource is a time, frequency, and code domain resource.

11. The apparatus according to any of claims 1 to 10, whereinin relation to said receiving said resource configuration, the instructions, when executed by the at least one processor, cause the apparatus at least to perform: receiving a resource set configuration for at least one sounding reference signal set including said at least one sounding reference signal resource.

12. The apparatus according to any of claims 1 to 11, whereinthe instructions, when executed by the at least one processor, cause the apparatus at least to perform: transmitting information on own hardware capabilities.

13. An apparatus, comprisingat least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: determining a resource configuration, for a terminal, the resource configuration configuring at least one sounding reference signal resource associated with a plurality of logical antenna ports assignable to physical antenna elements of an antenna array, and transmitting said resource configuration towards said terminal, wherein said at least one sounding reference signal resource is configured by combinations of comb offset values and cyclic shift values, each combination of said combinations of comb offset values and cyclic shift values corresponding to one antenna port of said plurality of antenna ports, and wherein a first antenna port of said plurality of antenna ports and a second antenna port of said plurality of antenna ports are coherent in phase and / or amplitude domain.

14. The apparatus according to claim 13, whereinsaid first antenna port corresponds to a first combination of a first comb offset value and a first cyclic shift value of said combinations of comb offset values and cyclic shift values, said second antenna port corresponds to a second combination of a second comb offset value and a second cyclic shift value of said combinations of comb offset values and cyclic shift values, andsaid first comb offset value and said second comb offset value are the same.

15. The apparatus according to claim 13 or 14, whereinsaid plurality of logical antenna ports includes at least 9 antenna ports, and / ora number of said comb offset values is higher than 8, and / or at least one comb offset value of said comb offset values is higher than 8, and / or a number of said cyclic shift values is higher than 12, and / or at least one cyclic shift value of said cyclic shift values is higher than 12, and / or said resource configuration includes coherency information defining coherency of logical antenna ports of said plurality of logical antenna ports in phase and / or amplitude domain, and / or said resource configuration configures a number of non-overlapping subset of logical antenna ports of said plurality of logical antenna ports, and / or said at least one sounding reference signal resource is a time, frequency, and code domain resource.

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