Simultaneous multi-panel pusch transmission enhancements

Abstract

A UE able to communicate with multiple TRPs using a set of between two and four antenna panels receives, from TRP(s), configuration for one of SDM-based or SFN-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook- based preceding or non-codebook-based precoding, with a number of indicated different TCI states that correspond to a number of the antenna panels. The antenna panels in the set are equipped with a same number of antenna ports. The UE transmits to the multiple TRPs over the uplink channel using the set of antenna panels based at least on the received configuration. A network element sends the configuration via one or more of the TRPs and receives a transmission from the UE to the multiple TRPs over the uplink channels using the antenna panels based at least on the sent configuration.

Description

Simultaneous Multi-Panel PUSCH Transmission EnhancementsTECHNICAL FIELD

[0001] Examples of embodiments herein relate generally to uplink transmissions in a wireless system and, more specifically, relate to simultaneous physical uplink shared channel (PUSCH) transmissions.BACKGROUND

[0002] For wireless systems such as cellular systems, data rates keep increasing. For example, customer premise equipment (CPE) is telecommunications equipment that is installed at a customer's location, typically at their home or business. CPE may be used for telecommunications applications such as Voice over IP (VoIP) and digital video. Digital video, in particular takes a lot of data.

[0003] One promising technique for transferring this data is for a user equipment (UE) to have multiple antenna panels that communicate over physical uplink shared channels (PUSCHs) to multiple transmission-reception points (TRPs). This requires quite a bit of coordination between the UE and the TRPs.BRIEF SUMMARY

[0004] This section is intended to include examples and is not intended to be limiting.

[0005] In an exemplary embodiment, a method is disclosed that includes receiving, by a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels and from at least one of the multiple transmissionreception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration.

[0006] An additional exemplary embodiment includes a computer program, comprising instructions for performing the method of the previous paragraph, when the computer program is run on an apparatus. The computer program according to this paragraph, wherein the computer program is a computer program product comprising a computer-readable medium bearing the instructions embodied therein for use with the apparatus. Another example is the computer program according to this paragraph, wherein the program is directly loadable into an internal memory of the apparatus.

[0007] An exemplary apparatus includes one or more processors and one or more memories storing instructions that, when executed by the one or more processors, cause the apparatus at least to perform: receiving, by a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based preceding or non-codebook- based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration.

[0008] An exemplary computer program product includes a computer-readable storage medium bearing instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: receiving, by a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook- based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to themultiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration.

[0009] In another exemplary embodiment, an apparatus comprises means for performing: receiving, by a user equipment able to communicate with multiple transmissionreception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexingbased or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmissionreception points over the uplink channel using the set of antenna panels based at least on the received configuration.

[0010] In an exemplary embodiment, a method is disclosed that includes sending, from a network element to a user equipment able to communicate with multiple transmissionreception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebookbased precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

[0011] An additional exemplary embodiment includes a computer program, comprising instructions for performing the method of the previous paragraph, when the computer program is run on an apparatus. The computer program according to this paragraph, wherein the computer program is a computer program product comprising a computer-readable medium bearing the instructions embodied therein for use with the apparatus. Another example is thecomputer program according to this paragraph, wherein the program is directly loadable into an internal memory of the apparatus.

[0012] An exemplary apparatus includes one or more processors and one or more memories storing instructions that, when executed by the one or more processors, cause the apparatus at least to perform: sending, from a network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook- based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

[0013] An exemplary computer program product includes a computer-readable storage medium bearing instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: sending, from a network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook- based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

[0014] In another exemplary embodiment, an apparatus comprises means for performing: sending, from a network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmissionreception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the attached drawings:

[0016] FIG. 1 illustrates an example of Rel- 17 S-DCI for TDM M-TRP PUSCH repetition and antenna panel selection;

[0017] FIG. 2 illustrates an example of simultaneous multi-panel PUSCH transmission with four TRPs with four antenna panels;

[0018] FIG. 3 is a flowchart of a method performed by a UE when the UE is configured with codebook-based PUSCH and a parameter indicating a multi-panel scheme is set to a multiple number of panels in accordance with an exemplary embodiment;

[0019] FIG. 3A is a figure of a table, Table 7.3.1.1.2-2B: Precoding information and number of layers for 4 antenna ports, if transform precoder is disabled, maxRank = 3 or 4, and ul- FullPowerTransmission = fullpowerMode 1 , from 3GPP TS 38.212 V17.5.0 (2023-03);

[0020] FIG. 4 is a flowchart of a method performed by a UE when the UE is configured with non-codebook-based PUSCH and a parameter indicating a multi-panel scheme is set to a multiple number of panels in accordance with an exemplary embodiment;

[0021] FIG. 5 illustrates an example of simultaneous multi-panel PUSCH transmission with four TRPs with four antenna panels in accordance with an exemplary embodiment;

[0022] FIG. 6 is a signaling diagram illustrating simultaneous multi-panel PUSCH transmission enhancements in an exemplary embodiment; and

[0023] FIG. 7 is a block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments may be practiced.DETAILED DESCRIPTION OF THE DRAWINGS

[0024] Abbreviations that may be found in the specification and / or the drawing figures are defined below, at the end of the detailed description section.

[0025] The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. All of the embodiments described in this Detailed Description are exemplary embodiments provided to enable persons skilled in the art to make or use the invention and not to limit the scope of the invention which is defined by the claims.

[0026] When more than one drawing reference numeral, word, or acronym is used within this description withand in general as used within this description, the “ / ” may be interpreted as “or”, “and”, or “both”. 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.

[0027] As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “has”, “having”, “includes” and / or “including”, when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0028] Any flow diagram or signaling diagram (such as FIG. 6) herein is considered to be a logic flow diagram, and illustrates the operation of an exemplary method, results of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and / or interconnected means for performing functions in accordance with an exemplary embodiment. Block diagrams (such as FIGS. 1-5 and 7) also illustrate the operation of an exemplary method, results of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and / or interconnected means for performing functions in accordance with an exemplary embodiment.

[0029] The examples herein relate at least in part to PUS CH, an overview of which is now provided. In 5G NR, PUSCH is the physical uplink channel that carries user data. The timefrequency structure of reference signals depends on the type of waveform configured for PUSCH, as defined in 3GPP TS 38.211 Sections 6.4.1.1 and 6.4.1.2. When transform precoding is disabled, the waveform configured is cyclic -prefix-orthogonal frequency division multiplexing (CP-OFDM). When transform precoding is enabled, the waveform configured is discrete- Fourier-transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM). Two transmission schemes are supported for PUSCH in Rel-15 NR that support explicit TX beam indication: codebook-based transmission and non-codebook-based transmission.

[0030] An introduction is now provided about Rel-15 UL PUSCH transmission mode(s). Rel-15 specifications enable the UE to be configured with either codebook or noncodebook based PUSCH transmission with two UL SRS resource sets. In other words, based on this configuration, the UE transmits PUSCH up to rank 4 with a single TX antenna panel to a single TRP. In a later part of the text description herein, this mode is referred to as Rel-15 UL TX mode. The target of Rel-15 single-panel precoded PUSCH with a single TRP is to improve reliability and / or throughput of STxMP PUSCH transmission with a single TRP.

[0031] Rel-17 UL PUSCH transmission mode(s) are now described. FIG. 1 shows an example of Rel-17 single downlink control information indicator (S-DCI) for time-division multiplexing (TDM) multi-transmission-reception point (M-TRP) physical uplink shared channel (PUSCH) repetition and antenna panel selection. FIG. 1 shows two TRPs #1 70-1 and #2 70-2 transmitting multiple beams. The TRP #1 70-1 has four beams with the following CRIs: CRI#23;CRI#14; CRI#11 ; and CRI#31, The TRP #270-2 has four beams with the following CRIs: CRI#43; CRI#22; CRI#12; and CRI#32. The UE 10 has two antenna panels 1 110-1 and 2 110-2. The antenna panel 1 110-1 is used for communication via a radio link 11-1 with TRP #1 70-1, and antenna panel 2 110-2 is used for communication via a radio link 11-2 with TRP #270-2. For radio link 11-1, this carries a downlink 130 that provides the following in reference 140: DCI: precoding information-layer-infol, SRI#x, precoding-layer-info2, SRI#y, SRS-set indicator. Radio link 11-1 carries PUSCH 120-1 in UL. For radio link 11-1, this carries PUSCH 120-2 in UL.

[0032] Rel-17 was specified to enhance reliability of uplink transmission in the context of a multi-TRP scenario. The UE 10 is configured with two different UL SRS resource sets with followUnifiedTCIstateSRS information elements to follow two different DL / or joint DL and UL / UL TCI states associated as the spatial source. TCI-State associates one or two downlink (DL) reference signals with a corresponding quasi-colocation (QCL) type.

[0033] Based on the Rel-17 capability set index reporting, a network can be aware of the UE antenna panel (including information on the number of UL SRS antenna ports) specific transmission capability of UL SRS codebook-based transmission into a certain spatial UL direction. Based on this information, the network can trigger transmission of two different UL SRS resource sets with the usage of codebook to obtain TRP-specific TPMI hypotheses (i.e., determine precoder index and rank selection) antenna panel specifically for PUSCH transmissions.

[0034] Based on obtained TRP-specific TPMI and SRI information, the network can trigger non-simultaneous TRP-specific Rel-17 PUSCH transmission by indicating via DCI. As is known, DCI includes multiple codepoint fields, e.g., SRI, TCI, which are information elements which convey information that indicates to the UE to trigger some specific procedure / action. Specifically, a codepoint field assigned for a single SRS resource set indicator, in which 2-bits, and thereby four values, are reserved in Rel-17, when two SRS resource sets are configured with usage of a codebook or non-codebook transmission. O-bit, the first value out of the four possible values of the DCI codepoint, may be used to indicate which of the two SRS resource indicators (SRIs), the first or the second, is used to enable dynamic switching between a single TRP (either TRP1 or either TRP2) PUSCH transmission in time division multiplexing (TDM) manner, andthe other remaining two bits may be used to enable multi-TRP PUSCH transmission between TRP1 and TRP2 in a TDM manner with repetition either cyclical or sequential mapping configured via RRC for mapping two SRIs to PUSCH repetitions. Moreover, for codebook-based transmission, the DCI includes two separate codepoint fields for SRIs and two preceding information and number of transmission layers fields. It is worth noting that the first field indicates the number of transmission layers, whereas the second field does not. For non- codebook-based transmission, the DCI may comprise two SRI codepoint fields, where the first one indicates the transmission layers and second does not. Based on the received single DCI (S- DCI), the terminal device may then transmit the PUSCH transmission using the multiple antenna panels 110 (only one panel at the time). In a later part of the text description herein, this mode is referred to as Rel-17 UL TX mode.

[0035] The Rel-17 specification enables the UE to be configured for either codebookbased or non-codebook-based PUSCH transmission. In other words, based on this configuration, the UE assumes that upon reception of DCI with or without uplink grant, SRS indicators and precoding information are associated with either codebook-based or non-codebook-based PUSCH transmission. The target of Rel-17 TDM based M-TRP PUSCH with repetition is to enhance reliability of PUSCH transmission with M-TRPs.

[0036] For Rel-18, it is important to identify and specify necessary enhancements for uplink MIMO, while necessary enhancements on downlink MIMO that facilitate the use of large antenna array, not only for FR1 but also for FR2, would still need to be introduced to fulfil the request for evolution of NR deployments.

[0037] 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, IAB, and other applications where devices power / form-factor / cost are not as stringent as in traditional handheld devices. UL transmission with >4Tx is useful to bridge the gap between DL and UL spectral efficiency, in both FR1 and FR2. Hence, there is strong need to develop methods and / or signaling solutions to overcome this problem for Rel-18 or beyond releases.

[0038] In comparison to single (S)-DCI based Rel-17 TDM repetition scheme, Rel-18 will specify support for both S-DCI and multi (M)-DCI based simultaneous uplink multi-panelPUSCH schemes with SDM and SFN, targeting to enhance throughput and reliably with reduced latency.

[0039] In an SDM-based scheme, different layers / DMRS ports of one PUSCH are separately precoded and transmitted from different UE panels simultaneously. In an SFN-based transmission scheme, all of the same layers / DMRS ports of one PUSCH transmission occasion are transmitted from two different UE panels simultaneously.

[0040] In general, Rel-17 specifications (e.g., 3GPP TS 38.214, 38.212) do not provide any support for S-DCI or M-DCI based simultaneous UL PUSCH transmission with multiple antenna panels. For S-DCI, a network is assumed to have a centralized scheduler with an ideal backhaul between multiple TRPs, whereas for M-DCI, a distributed scheduler with nonideal backhaul is assumed.

[0041] A Rel-18 UE can be configured to use SFN (single-frequency network) or SDM (spatial division multiplexing) transmission mode. SFN and SDM can be described as follows, where the applied precoding can be a codebook-based or non-codebook-based one:

[0042] 1) SDM scheme: different PUSCH layers and DMRS antenna ports of one codeword are separately precoded and transmitted from different UE antenna panels simultaneously;

[0043] 2) SFN-based transmission scheme: the same PUSCH layers and DMRS antenna ports are transmitted simultaneously with two different precoders via two different UE antenna panels associated with different TCI states.

[0044] The target of Rel-18 SFN-based STxMP PUSCH with two TRPs is to enhance reliability and latency of STxMP PUSCH transmission with M-TRPs. The target of Rel-18 SDM based STxMP PUSCH with two TRPs is to enhance throughput of STxMP PUSCH transmission with M-TRPs. In both SDM and SFN with codebook-based precoding, the UE is provided with a separate precoder matrix for each transmitting panel in DCI via two TPMI entries. Rel-18 supports single-DCI-based STxMP PUSCH SDM scheme, support the layer combinations of { 1+1, 1+2, 2+1 and 2+2} for a single CW case. This applies to SDM with one codeword.

[0045] For Rel-19, even though currently there is no any study or work item available for Rel-19 NR specification work, it can be assumed that Rel-1 will make specification enhancements to improve UL reliability and throughput enhancement for Rel-19. Therefore, oneof potential objectives of Rel-19 NR MIMO is to discuss and define how to provide specification support for simultaneous multi-panel UL transmission with up to four TRP with more than 2 panels, e.g., with four panels (STx4P) targeting CPE / FWA / vehicle / industrial devices (if applicable), where the total number of layers is up to eight across all panels and total number of codewords is up to two across all panels, considering single DCI and multi-DCI based multi- TRP operation.

[0046] As previously discussed, it is expected that the Rel-19 specification will provide support for different simultaneous multi-panel PUSCH transmission modes, e.g., SDM and SFN with up to four TRPs with more than two antenna panels (e.g., four).

[0047] FIG. 2 shows an example of simultaneous multi-panel PUSCH transmission with four TRPs 70-1, 70-2, 70-3, and 70-4 with four antenna panels 110-1, 110-2, 110-3, and 110-4. The radio link 11-1 carries PDCCH on the downlink 130 and the PUSCH 120-1 in uplink, with one layer and having TCI-state#l 220-1, on the UL. The radio link 11-2 carries the PUSCH 120-2, with two layers and having TCI-state#3 220-2, on the UL. The radio link 11-3 carries the PUSCH 120-3, with three layers and having TCLstate#5 220-3, on the UL. The radio link 11-4 carries the PUSCH 120-4, with two layers and having TCI-state#8 22-4, on the UL.

[0048] As shown, the UE 10 can be scheduled via S-DCI to transmit simultaneously precoded PUSCH transmission with rank 8 (with two codewords) with four TRPs as well as four antenna panels. The UE has been configured with multiple UL SRS resource sets (e.g., two or more ) with corresponding TCI state flags. In other words, when PUSCH transmission is triggered via S-DCI with the assumption of an indicated TCI codepoint (via DL DCI format), the UE has understanding based on UL SRS resource set configuration and followUnifiedTCIstateSRS-rl7 information element which of TCI states, indicated via TCI codepoint, are to be applied for simultaneous PUSCH transmission for each of antenna panels. It is noted that a TCI codepoint field can include multiple TCI states, so it scales in principle easily to any number of TCI states. Furthermore, it is assumed that a serving TRP has triggered / configured the UE to transmit four different UL SRS resource sets with corresponding resources with usage ‘codebook’ towards four different TRPs prior to actual PUSCH transmission, based on which a network can determine its precoding and layer information for each TRP specific PUSCH transmissions.

[0049] Since Rel-18 supports only simultaneous PUSCH transmission via two different antenna panels with two indicated TCI states and two configured UL SRS resource sets, a problem arises for a network as to how to indicate precoding and layer information for UEs capable of simultaneous PUSCH transmission with four antenna panels. It is worth noting that Rel-18 DCI format (e.g., 0_l or 0_2) provides only support for two different DCI codepoint fields associated with precoding and layer information. In other words, Rel-18 specification does not provide any support for this.

[0050] Based on the above, ambiguity remains for the network and a Rel-19 UE as to how to indicate, and how to interpret correctly, indicated precoder and layer information for simultaneous multi-panel PUSCH transmission with four antenna panels. The examples herein address the aforementioned problems and provide solutions accordingly.

[0051] To address these and other issues, one example herein proposes a new enhanced method to dynamically indicate precoder or resource and layer information for simultaneous SDM and SFN based multi-antenna panel PUSCH transmission with codebook and non-codebook-based precoding with, e.g., four indicated different TCI states and four UL SRS resource sets, where different TX antenna panels are equipped with a symmetrical number of antenna ports. That is, in an example, there could be one of (1) precoder information or (2) resource and layer information, but this can be dependent on codebook or non-codebook operation content of applied DCI codepoints changes. The dynamic aspect occurs because the time period between when a scheduling grant is received and when the UE transmits is expected to be short, e.g., in the millisecond (ms) range and even less than 1ms. In this case, “a symmetrical number of antenna ports” means that each of the antenna panels has a same number of antenna ports. Moreover, a further example proposes also corresponding UE behaviors (e.g., how the UE should interpret indicated information) for proposed enhanced indication methods for simultaneous multi-panel PUSCH transmission. The primary examples here describe using four Tx panels, as this seems to be a reasonable number of panels for most equipment (e.g., four panels are easy to apply to a rectangular object). However, the number of panels could be from two to four panels.

[0052] One embodiment is described in part through reference to FIG. 3, which is a flowchart of a method performed by a UE when the UE is configured with codebook-basedPUSCH and a parameter indicating a multi-panel scheme is set to a multiple number (e.g., >2 but <4) of panels. In this example, in block 310, when the UE is configured with codebook-based PUSCH and a (e.g., higher layer such as RRC) parameter indicating a multi-panel scheme (is to be used for transmission) is set to a multiple number of panels (e.g., multipanelScheme is set to ‘4-panel-SDMScheme’ or ‘4-panel-SFNScheme’) as well as a corresponding multiple (e.g., four) UL SRS resource sets are configured in uplink DCI with a scheduling grant. The configuring of codebook-based PUSCH means that the configuration includes indication of codebook-based precoding for use for transmission of PUSCH.

[0053] In further detail, as described previously, 4-SRS resource set configuration is not supported in Rel-18. Therefore, here, a UE is configured with 4 different UL SRS resource sets. Even more specifically, scheduling DCI of the UE is configured, e.g., with RRC, with four different UL SRS resource sets. Furthermore, each UL SRS resource set is configured with a single UL SRS resource with N-antenna ports, e.g., N=4. Otherwise, one-to-one mapping could not occur between indicated SRI and TPMI codepoint fields and applied antenna ports of different antenna panels. The scheduling DCI is referred to also as uplink DCI because the information in the DCI is uplink scheduling information, and uplink DCI is also referred to herein as control information for uplink, as scheduling information is part of the control information.

[0054] In block 320, when the parameter is set to indicate a particular number of panels and SDM (e.g., multipanelScheme is set to ‘4-panel-SDMScheme’), values of SRI and 2ndSRI codepoint fields of uplink scheduling DCI, e.g., DCI format 0_l, indicate separately for the UE precoding and layer information (e.g., an index to uplink codebook matrix / vector and corresponding number of layers ) associated with the third and fourth UL SRS resource sets, respectively (e.g., antenna panel specifically). Additionally, the values of TPMI and 2ndTPMI codepoint fields indicate for the UE precoding and layer information associated with the first and second UL SRS resource sets, respectively. It is noted that SRI is referred to herein also as reference signal resource identity.

[0055] In block 330, when the parameter is set to indicate a particular number of panels and SFN (e.g., multipanelScheme is set to ‘4-panel-SFNScheme’), the value of SRI and 2ndSRI codepoint fields of uplink scheduling DCI (referred to as control information for uplink),e.g., DCI format 0_l, indicate separately for the UE precoding information (e.g., an index to uplink codebook matrix / vector) associated with the third and fourth UL SRS resource sets, respectively (e.g., antenna panel specifically). Additionally, the TPMI codepoint field indicates for the UE precoding and layer information associated with the first UL SRS resource sets. Furthermore, the value of TPMI codepoint field indicates the number of layers information also for the 2ndTPMI, SRI and 2ndSRI codepoint fields that are associated with the second, third, and the fourth UL SRS resource sets, respectively.

[0056] In alternative approach, in block 340, the value of 2ndTPMI codepoint field indicates the number of layers information for the TPMI, 2ndTPMI, SRI and 2ndSRI codepoint fields that are associated with the first, second, third, and the fourth UL SRS resource sets, respectively.

[0057] For blocks 320 / 330 / 340 (and also 420 / 430, described below), there is considered to be a one-to-one mapping between 1st, 2nd, 3rd and 4th UL SRS resource sets and the SRIs and TPMIs as described in the blocks. The reason for this is that RRC, in examples, defines an order for a resource set configured in the DCI based on an order of how SRS resource sets are configured into DCI. Thus, the following language (from block 320) indicates part of this definition and its use: “values of (a 1st) SRI and 2ndSRI codepoint fields of uplink scheduling DCI (referred to as control information for uplink) indicate separately for the UE precoding and layer information associated with the third and fourth UL SRS resource sets, respectively.” The “separately” means each of the first or second SRI code point fields independently, and the “respectively” indicates for this example the mapping of the 1stand 2ndSRI to the 3rdand 4thUL SRS resource sets, in accordance with the defined order for the resource set configured in the DCI.

[0058] Furthermore, there is assumption in the current 3 GPP specification that PUSCH antenna ports over which precoding (codebook / non-codebook) is performed are the same as UL SRS antenna ports. That is, UL SRS antenna ports are the ones which are associated with UL SRS resources which are assigned with UL SRS resource sets where each UL SRS resource set is associated with different antenna panels.

[0059] The information that precoding and layer information codepoint may carry include the following. This could carry an indication value which is associated with a certainTPMI for a certain number of SRS antenna ports and certain number of layers. In other words, aforementioned codepoint indicates an index to which is associated for certain TPMI value (e.g., a vector / sub-matrix of precoding matrix) for a certain number of SRS antenna ports which itself includes also the number of layers. So, this indicated value itself can reveal how many layers UE need to use when transmitting PUSCH via a certain antenna panel (i.e., UL SRS resource set). FIG. 3A is a figure from 3GPP TS 38.212 for 4 antenna ports to illustrate how an indicated value may be associated to TPMI and corresponding layer information.

[0060] The UE, in block 350, determines that indicated layers of TPMI, 2ndTPMI, SRI and 2ndSRI are associated with indicated DMRS antenna ports with the following order {vi, V2, V3, V4 }, where vi, V2, V3, and V4 define indicated rank values. See the following examples.

[0061] TPMI: vi layers indicated via TPMI, where vi < Lmaxiwhere Lmaxiis maximum rank per 1st UL SRS resource set configured by higher layers.

[0062] 2ndTPMI: V2 layers indicated via 2ndTPMI, where V2 < Lmax2 where Lmax2 is maximum rank per 2ndUL SRS resource set configured by higher layers.

[0063] SRI: V3 layers indicated via SRI, where V3 < LmaX3 where LmaX3 is maximum rank per 3rd UL SRS resource set configured by higher layers.

[0064] 2ndSRI: { V3. . . V4-I } layers, where V4 < LmaX4 where Lmax4 is maximum rank per 4th UL SRS resource set configured by higher layers.

[0065] If one or more of the above codepoint field(s) is / are not indicated as part of DCI, indicated DMRS antenna ports do not take into account layers which are not indicated as part of TPMI, 2ndTPMI, SRI and 2ndSRI.

[0066] To put this into context, the v's are layers which are implicitly indicated for codebook-based PUSCH as part of indicated TPMI values, e.g., as shown above. In other words, TPMI value indicates the same actual TPMI realization associated with some specific layer information. Similarly, for non-codebook based PUSCH, layer information is indicated implicitly in the indicated SRI value. In other words, when SRI value indicates >1 value then the value means that number of layers is >1. The Lmaxiand LlmaX2 are upper limits for the indicated values configured separately, e.g., by RRC. Similar statements can be made for LinaX3 and Llmax4.

[0067] In block 360, the UE determines that associations between SRI, 2ndSRI, TPMI, 2ndTPMI and the first, second, third and fourth UL SRS resource sets are configured in scheduling DCI, e.g., as follows:

[0068] 1) indicated codepoint value of TPMI associated with the first UL SRS resource set;

[0069] 2) indicated codepoint value of 2ndTPMI associated with the second UL SRS resource set;

[0070] 3) indicated codepoint value of SRI associated with the third UL SRS resource set; and

[0071] 4) indicated codepoint value of 2ndSRI associated with the fourth UL SRS resource set.

[0072] It is up to UE’s own implementation how different UL SRS resource sets are associated with physical TX antenna panels and / or antenna connectors. See block 370. As previously described, UL SRS resource sets are configured for the UE and prior PUS CH transmission, and UL SRS resource set are transmitted towards different TRPs. Based on this, information each TRP / or central entity communicates based on backhauling information exchange (see reference 660 of FIG. 6 as an example), will determine what TPMI or SRI is the most feasible one for a corresponding beam per pair link between UE and TRP. Then, based on this phase, different determined, e.g., TPMI values, are conveyed via backhauling to a scheduling TRP (referred to as the serving TRP in FIG. 6), which will then trigger DCI for simulations PUSCH transmission, where those determined TPMI values are indicated for the UE. Since the central entity (referred to below in reference to FIG. 6 as a central unit, CU, 700) has already configured the UE and performed the process described there, the central entity can determine the received data corresponding to the four different communication streams and perform processing based on these.

[0073] Turning to FIG. 4, this figure is a flowchart of a method performed by a UE when the UE is configured with non-codebook-based PUSCH and a parameter indicating a multi-panel scheme is set to a multiple number of panels. In block 410, the UE is configured with non-codebook-based PUSCH and a (e.g., higher layer) parameter set to a multiple number (e.g., >2 but <4) of panels (e.g., multipanelScheme is set to ‘4-panel-SDMScheme’ or ‘4-panel-SFNScheme’) as well as a corresponding multiple (e.g., four) UL SRS resource sets are configured in uplink DCI with grant. The configuring of non-codebook-based PUS CH means that the configuration includes indication of non-codebook-based precoding for use for transmission of PUSCH.

[0074] In block 420, when the parameter is set to indicate a particular number of panels and SDM (e.g., multipanelScheme is set to ‘4-panel-SDMScheme’), values of TPMI and 2ndTPMI codepoint fields of uplink scheduling DCI (referred to as control information for uplink), e.g., DCI format 0_l, indicate separately for the UE resource(s) be associated with layer(s) {v2,. , .,V3 -1 }, and {V3,...,V4-1 J, respectively. The values of V2 , V3, V4 indicate the number of layers that are associated with indicated number of resources for the codepoint fields in the following order: 2ndSRI, TPMI, 2ndTPMI. Note: The value of codepoint field SRI indicates for the resources associated with layers { 0, .. . ,vi - 1 } , where vi corresponds to the number of layers are associated with indicated number of resources for the codepoint field SRI.

[0075] For block 430, when the parameter is set to indicate a particular number of panels and SFN (e.g., multipanelScheme is set to ‘4-panel-SFNScheme’), values of TPMI and 2ndTPMI codepoint fields of uplink scheduling DCI (referred to as control information for uplink), e.g., DCI format 0_l, indicate separately for the UE resource(s), where the number of indicated resources as well as layer(s) is the same{0,...,vi -1 ], and {0,...,vi -1 ], respectively. Note: The value of codepoint field SRI indicates for the resources associated with layers [ 0,. . ,,vi -1 }, where vi corresponds to the number of layers that are associated with indicated number of resources for the codepoint field SRI. Moreover, the value of codepoint field 2ndSRI indicates the resources associated with layers { 0, . . . ,vi - 1 } .

[0076] The UE determines, in block 450, that indicated layers of SRI, 2ndSRI, TPMI, 2ndTPMI are associated with indicated DMRS antenna ports with the following order {vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values. See the following examples.

[0077] TPMI: vi layers indicated via TPMI, where vi < Lmaxiwhere Lmaxiis maximum rank per 1st UL SRS resource set configured by higher layers.

[0078] 2ndTPMI: V2 layers indicated via 2ndTPMI, where V2 < Lmax2 where Lmax2 is maximum rank per 2ndUL SRS resource set configured by higher layers.

[0079] SRI: V3 layers indicated via SRI, where V3 < Lmax3 where LmaX3 is maximum rank per 3rd UL SRS resource set configured by higher layers.

[0080] 2ndSRI: { V3. . . V4- 1 } layers, where V4 < LmaX4 where Lmax4 is maximum rank per 4th UL SRS resource set configured by higher layers.

[0081] If one or more of the above codepoint field(s) is / are not indicated as part of DCI, indicated DMRS antenna ports do not take into account layers which are not indicated as part of TPMI, 2ndTPMI, SRI and 2ndSRI.

[0082] The UE determines, in block 460, that associations between SRI, 2ndSRI, TPMI, 2ndTPMI and the first , second, third and fourth UL SRS resource sets are configured in scheduling DCI, e.g., as follows:

[0083] 1) indicated codepoint value of TPMI associated with the first UL SRS resource set;

[0084] 2) indicated codepoint value of 2ndTPMI associated with the second UL SRS resource set;

[0085] 3) indicated codepoint value of SRI associated with the third UL SRS resource set; and

[0086] 4) indicated codepoint value of 2ndSRI associated with the fourth UL SRS resource set.

[0087] It is up, in block 470, to UE’s own implementation how different UL SRS resource sets are associated with physical TX antenna panels and / or antenna connectors.

[0088] Other examples are as follows. In one embodiment, when the UE is configured with simultaneous multi-panel SDM or SFN based PUSCH transmission with four TCI states, the network / gNB can repurpose existing codepoint fields of uplink DCI with data grant (e.g., DCI format 0_l) such that SRI and 2ndSRI codepoint fields indicate precoding and number of layer information for codebook-based simultaneous multi-panel PUSCH transmission.

[0089] In one embodiment, when the UE is configured with simultaneous multi-panel SDM or SFN based PUSCH transmission with four different TCI states, the network / gNB can repurpose existing codepoint fields of uplink DCI with data grant (e.g., DCI format 0_l) such that TPMI and 2ndTPMI codepoint fields indicate SRS resources and layer information for non- codebook-based simultaneous multi-panel PUSCH transmission.

[0090] In one implementation example, the UE reports capability for simultaneous enhanced multi-panel PUSCH transmission with four TX antenna panels, where one or more information elements can be associated to indicate simultaneous multi-panel PUSCH transmission capability for SDM and / or SFN with four antenna panels.

[0091] In another implementation example, the UE is configured with four UL SRS resource sets with usage of codebook where each set is configured with one UL SRS resource with N-antenna ports, where the value of N is the same in each set.

[0092] In another implementation example, the UE is configured with four UL SRS resource sets with usage of non-codebook transmission where each set is configured with one or more UL SRS resources with single antenna, where the number of single antenna resources is assumed to be same in each set.

[0093] FIG. 5 shows an example of simultaneous multi-panel PUSCH transmission with four TRPs with four antenna panels in an exemplary embodiment. The left-hand side shows configurations 520-1, 520-2, 520-3, and 520-4. With these configurations 520, the UE 10 has been configured with multiple UL SRS resource sets: (1) for configuration 520-1, SRS resource set#O 510-0 and SRI#1 530-1 with 4-AP SRS resource, used with PUSCH 120-1 on antenna panel 110-1 with four antenna ports (4-AP); (2) for configuration 520-2, SRS resource set#l 510-1 and SRI#2 530-2 with 4-AP SRS resource, used with PUSCH 120-2 on antenna panel 110- 2 with 4-AP; (3) for configuration 520-3, SRS resource set#2 510-2 and SRI#3 530-3 with 4-AP SRS resource, used with PUSCH 120-3 on antenna panel 110-3 with 4-AP; and (4) for configuration 520-4, SRS resource set#3 510-3 and SRI#4 530-4 with 4-AP SRS resource, used with PUSCH 120-4 on antenna panel 110-4 with 4-AP. Each of these has a corresponding followUnifiedTCIstateSRS-rl7 information element. These information elements provide one- to-one mapping between TCI codepoints 220 and states and SRS resource sets 510. See, e.g., blocks 360 of FIG. 3 and 460 of FIG. 4 and corresponding text. It is noted that the number of antenna ports used in this example is four, but this is just an example of 4-AP usage. In principle, the number of ports can be any number, as this is up to UE capability.

[0094] As shown, the UE 10 can be scheduled via S-DCI to transmit simultaneously precoded PUSCH transmission with rank 8 (with two codewords) with four TRPs 70 as well as four antenna panels. The UE has been configured with multiple UL SRS resource sets (e.g., twoor more ) with a corresponding TCI state flag. In other words, when PUSCH transmission is triggered via S-DCI with the assumption of an indicated TCI codepoint (e.g., indicated via DL DCI format), the UE has the understanding based on UL SRS resource set configuration which of TCI states are to be applied for simultaneous PUSCH transmission for each of antenna panels. Here, the indicated codepoint includes the following activated uplink TCI-states: {TCI-state#l 220-1, TCI-state#2 220-2, TCI-state#5 220-3, TCI-state#8 220-4} . Furthermore, it is assumed that a serving / scheduling TRP (e.g., TRP1 70-1 using PDCCH) has triggered / configured the UE to transmit four different UL SRS resource sets 510 with corresponding resources with usage ‘codebook’ (codebook-based PUSCH is used) towards four different TRPs 70 based on which a network can determine its precoding and layer information for each TRP-specific PUSCH transmissions.

[0095] When the higher layer parameter multipanelScheme is set to ‘4-panel- SDMScheme’ in PUSCH-config and four SRS resource sets 510 are configured in, e.g., srs- ResourceSetToAddModList or srs-ResourceSetToAddModListDCLO-2 with higher layer parameter usage in SRS-ResourceSet set to 'codebook1, two SRI(s), and two TPMI(s) are given by the DCI fields of two SRS resource indicators and two precoding information and number of layers. The UE assumes that the UE is configured with four periodic / semi-persistent / aperiodic UL SRS resource sets 510 with only one 4-AP UL SRS resource in each set (i.e., all sets have equivalent number of UL SRS antenna ports with only one resource in each set). The UE assumes that indicated codepoints, i.e., SRI, 2nd SRI, are repurposed for indicating 3rd TPMI and 4th TPMI being associated with 3rd and 4th UL SRS resource set, respectively. Furthermore, the UE shall assume that indicated codepoints, i.e., SRI, 2nd SRI, TPMI and 1st TPMI are associated with third UL SRS resource set, fourth UL SRS resource set, 1st UL SRS resource set, and 2nd UL SRS resource set configured into triggering DCI (e.g., format 0_l or 0_2). Furthermore, due to the aforementioned association, the UE shall assume that resource sets are configured only with single N-AP SRS resource, where N defines the number of SRS antenna ports. The UE shall assume that the first TPMI is used to indicate the precoder to be applied over layers { 0. . . v 1 - 1 } , where v 1 is the number of layers indicated by the first TPMI

[0096] Referring to FIG. 6, this figure is a signaling diagram illustrating simultaneous multi-panel PUSCH transmission in an exemplary embodiment. This figure involves a singleentity that controls the transmission and reception of PUSCH and corresponding information and uses the received PUSCH and corresponding SRS. In this example, the single entity is a network element referred to herein as a central unit (CU), which is a 5G term. For instance, a gNB (a network element that is a base station) may be further split into a gNB-Central Unit (gNB-CU) and one or more gNB-Distributed Unit(s) (gNB-DU), linked by the Fl interface. In this example, the TRPs 70 may be considered to be DUs, although this is merely one example and other examples are possible, such as remote radio heads (in LTE terminology). The term “CU” is used to reference a central processing point, is not meant to be limiting, and other network elements that perform the same or similar functions may be used.

[0097] The signaling diagram of FIG. 6 has signaling between a UE 10, a serving TRP 70-1, a CU 700, and other TRPs 70-2, 70-3, and 70-4. The CU 700, e.g., via the serving TRP 70-1, configures the UE 10 with configuration from 310 / 320 / 330 / 340 or 410 / 420 / 430. This occurs in block 610 . The UE 10 in block 620 assigns codebook-based or non-codebook-based parameters for SDN / SFN based PUSCH, and in block 630 assigns SRS resource sets and corresponding configuration to individual panels per the received configuration.

[0098] In block 632, the UE 10 transmits UL SRS resources associated with four different UL SRS resource sets towards the TRPs 70. Reference 631 indicates that each of the TRPs 70 receive UL SRS resources. Reference 633 indicates that different TRPs 70 convey their received SRS resources to the central processing unit, in this example the CU 700. In response, the CU 700 determines in block 635, using SRS resource sets and corresponding configuration, precoding and layer information for TRP-specific PUSCH transmissions.

[0099] Then, the serving TRP 70-1 transmits (block 638) using, e.g., PDCCH (i.e., uplink DCI) where proposed DCI codepoint fields are indicated and reception of the same triggers the PUSCH transmission by the UE 10. That is, the network schedules PUSCH transmission by indicating UL SRS resource sets and resources and TPMI values as indicated previously. It is noted that both 310-340 and 410-430 may be performed via RRC signaling. Although this is illustrated via block 610 and could signaled in a single time instance, this configuration may also be separated into multiple transmission time instants. It is simply assumed herein that steps 310-340 and 410-430 occur before step 638.

[0100] In block 640, in response to receiving in block 638, the UE 10 is triggered and transmits PUSCH simultaneously via multiple panels by using proposed precoder and layer information for codebook-based PUSCH by using existing precoder and layer information codepoint fields (e.g., two different) as well as SRI codepoint fields for precoder and layer information indication (e.g., two different). Similarly for non-codebook based PUSCH, precoder and layer information codepoint fields (e.g., two) are used to indicate one or more single antenna port SRS resources (==layers) and, e.g., two SRI codepoints for the same purpose. The one or more single antenna port SRS resources are equivalent to the number of layers, which is what the “==layers” indicates. In block 650, the TRPs 70-1, 70-2, 70-3, and 70-4 receive the PUSCH configured as per the configuration. Reference 660 indicates that the TRPs 70-1, 70-2, 70-3, and 70-4 perform backhaul communication so the CU 700 receives information from the PUSCHs. In block 670, the CU 700 performs decoding of channel decoding of one or more PUSCH codewords that are associated with layers. The decoding which may include demodulation (i.e., transformation of received symbols to soft-bit level information associated with different layers for channel decoding purposes) and decoding of channel coding. It is also possible that TRPs will perform demodulation and the CU 700 performs only channel decoding. The CU 700 could then use the results of block 670 as is known in this technology area.

[0101] Turning to FIG. 7, this figure shows a block diagram of one possible and nonlimiting example of a cellular network 1 that is connected to a user equipment (UE) 10. Multiple network elements are shown in the cellular network of FIG. 7: a radio access network (RAN) 735; and a core network 90. The RAN 735 includes TRPs 70-1, 70-2, 70-3, and 70-4, and CU 700.

[0102] In FIG. 7, a user equipment (UE) 10 is in wireless communication via radio link 11 with the TRPS 70, and through these to the CU 700, of the cellular network 1. A UE 10 is a wireless communication device, such as a mobile device, that is configured to access a cellular network. The UE 10 is illustrated with one or more antennas 28, which are the four antenna panels 110-1 through 110-4. The ellipses 2 indicate there could be multiple UEs 10 in wireless communication via radio links with the TRP 70. The UE 10 includes one or more processors 13, one or more memories 15, and other circuitry 16. The other circuitry 16 includes one or more receivers (Rx(s)) 17 and one or more transmitters (Tx(s)) 18. A program 12 is used to cause theUE 10 to perform the operations described herein. For a UE 10, the other circuitry 16 could include circuitry such as for user interface elements (not shown) like a display.

[0103] The TRP 70, as a network element of the cellular network 1, provides the UE 10 access to cellular network 1, e.g., via the CU 700 and to the data network 91 via the core network 90 (e.g., via a user plane function (UPF) of the core network 90). The TRP 70 is illustrated as having one or more antennas 58. The TRP 70 includes one or more processors 73, one or more memories 75, and other circuitry 76. The other circuitry 76 includes one or more receivers (Rx(s)) 77 and one or more transmitters (Tx(s)) 78. A program 72 is used to cause the TRP 70 to perform the operations described herein. Two or more TRP 70 communicate using, e.g., backhaul link(s) 79. The backhaul link(s) 79 may be wired or wireless or both.

[0104] It is noted that the TRP 70 may instead be implemented via other wireless technologies, such as Wi-Fi (a wireless networking protocol that devices use to communicate without direct cable connections). In the case of Wi-Fi, the link 11 could be characterized as a wireless link.

[0105] The CU 700, as a network element of the cellular network 1, controls the operations described herein on the network side and acts as a central processing point for the PUSCH and corresponding SRS. The CU 700 also, via the TRPs70, provides the UE 10 access to cellular network 1, e.g., via the data network 91 and further via the core network 90 (e.g., via a user plane function (UPF) of the core network 90). The CU 700 includes one or more processors 730, one or more memories 750, and other circuitry 760. The other circuitry 760 includes one or more receivers (Rx(s)) 770 and one or more transmitters (Tx(s)) 780. A program 720 is used to cause the CU 700 to perform the operations described herein.

[0106] The cellular network 1 may include a core network 90, as a third illustrated element or elements, that may include core network functionality, and which provide connectivity via a link or links 81 with a data network 91, such as a telephone network and / or a data communications network (e.g., the Internet). The core network 90 includes one or more processors 93, one or more memories 95, and other circuitry 96. The other circuitry 96 includes one or more receivers (Rx(s)) 97 and one or more transmitters (Tx(s)) 98. A program 92 is used to cause the core network 90 to perform the operations described herein.

[0107] The core network 90 could be a 5GC (5G core network). The core network 90 can implement or comprise multiple network functions (NF(s)) 99, and the program 92 may comprise one or more of the NFs 99. A 5G core network may use hardware such as memory and processors and a virtualization layer. It could be a single standalone computing system, a distributed computing system, or a cloud computing system. The NFs 99, as network elements, of the core network could be containers or virtual machines running on the hardware of the computing system(s) making up the core network 90.

[0108] Core network functionality for 5G may include access and mobility management functionality that is provided by a network function 99 such as an access and mobility management function (AMF(s)), session management functionality that is provided by a network function such as a session management function (SMF). Core network functionality for access and mobility management in an LTE (Long Term Evolution) network may be provided by an MME (Mobility Management Entity) and / or SGW (Serving Gateway) functionality, which routes data to the data network. Many others are possible, as illustrated by the examples in FIG. 7: AMF; SMF; MME; SGW; GMLC (Gateway Mobile Location Center); LMFs (Location Management Functions); UDM (Unified Data Management) / UDR (Unified Data Repository); NRF (Network Repository Function); and / or E-SMLC (Evolved Serving Mobile Location Center). These are merely exemplary core network functionality that may be provided by the core network 90, and note that both 5G and LTE core network functionality might be provided by the core network 90. The CU 700 is coupled via a link 31 to the core network 90. The CU 700 and the core network 90 may include an NG (Next Generation) interface for 5G, or an S 1 interface for LTE, or other suitable interface for other radio access technologies for communicating via the link 31.

[0109] In the data network 91, there is a computer-readable medium 94. The computer-readable medium 94 contains instructions that, when downloaded and installed into the memories 15, 75, 750, or 95 of the corresponding UE 10, TRPs 70, CU 700, and / or core network element(s) 90, and executed by processor(s) 13, 73, 730, or 93, cause the respective device to perform corresponding actions described herein. The computer-readable medium 94 may be implemented in other forms, such as via a compact disc or memory stick.

[0110] The programs 12, 72, 720, and 92 contain instructions stored by corresponding one or more memories 15, 75, 750, or 95. These instructions, when executed by the corresponding one or more processors 13, 73, 730, or 93, cause the corresponding apparatus 10, 70, 700, or 90, to perform the operations described herein. The computer readable memories 15, 75, 750, or 95 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, firmware, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The computer readable memories 15, 75,750, and 95 may be means for performing storage functions. The processors 13, 73, 730, and 93, may be of any type suitable to the local technical environment, and may include one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. The processors 13, 73, 730, and 93 may be means for causing their respective apparatus to perform functions, such as those described herein.

[0111] The receivers 17, 77, 770, and 97, and the transmitters 18, 78, 780, and 98 may implement wired or wireless interfaces. The receivers and transmitters may be grouped together as transceivers.

[0112] The cellular network 1 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network. Network virtualization involves platform virtualization, often combined with resource virtualization. Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities (such as network functions 99) that result from the network virtualization are still implemented, at some level, using hardware such as processors 73, 730, and / or 93 and memories 75, 750, and / or 95, and also such virtualized entities create technical effects.

[0113] In general, the various embodiments of the user equipment 10 can include, but are not limited to, cellular telephones (such as smart phones, mobile phones, cellular phones, voice over Internet Protocol (IP) (VoIP) phones, and / or wireless local loop phones), tablets,portable computers, vehicles or vehicle-mounted devices for, e.g., wireless V2X (vehicle-to- everything) communication, image capture devices such as digital cameras, gaming devices, music storage and playback appliances, Internet appliances (including Internet of Things, loT, devices), loT devices with sensors and / or actuators for, e.g., automation applications, as well as portable units or terminals that incorporate combinations of such functions, laptop-embedded equipment (LEE), laptop-mounted equipment (LME), Universal Serial Bus (USB) dongles, smart devices, wireless customer-premises equipment (CPE), an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD), a vehicle, a drone, a medical device and applications (e.g., remote surgery), an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts), a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. That is, the UE 10 could be any end device that may be capable of wireless communication. By way of example rather than limitation, the UE may also be referred to as a communication device, terminal device (MT), a Subscriber Station (SS), a Portable Subscriber Station, a Mobile Station (MS), or an Access Terminal (AT).

[0114] An example of possible implementations in 3GPP TS 38.331 specification is shown in text below for enabling simultaneous multi-panel PUSCH transmission:

[0115] - ASN1START

[0116] - TAG-PUS CH-CONFIG-START

[0117] PUSCH-Config ::= SEQUENCE {

[0118] - text omitted -

[0119] multipanelScheme = 4-panel-sdmScheme - {4-panel-sdmScheme, 4-panel- sfnScheme, sdmScheme, SFNscheme}

[0120] maxRankl = 1 - panel specific maximum rank for panel 1 (Lmaxl)

[0121] maxRank2 = 2 - panel specific maximum rank for panel 2 (Lmax2)

[0122] maxRank3 = 3 - panel specific maximum rank for panel 3 (Lmax3)

[0123] maxRank4 = 2 - panel specific maximum rank for panel 4 (Lmax4)

[0124]

[0125] -text omitted -

[0126] }

[0127] - TAG-PUSCH-CONFIG-STOP

[0128] - ASN1STOP

[0129] Without in any way limiting the scope, interpretation, or application of the claims appearing below, a technical effect and / or advantage of one or more of the example embodiments disclosed herein is enablement of utilization of UEs having capability for simultaneous SFN / SDM based PUSCH transmission with four TX antenna panels. Another technical effect and / or advantage of one or more of the example embodiments disclosed herein is the examples enable the network to dynamically indicate precoder / or resource and layer information for UEs capable of simultaneous PUSCH transmission with four TX antenna panels and four TCI states with different transmission modes, e.g., SDM and SFN. Another technical effect and / or advantage of one or more of the example embodiments disclosed herein is the examples define a UE procedure as to how to interpret properly the values of indicated codepoint fields: TPMI, 2ndTPMI, SRI, and 2ndSRI and corresponding transmission procedure.

[0130] The following are additional examples.

[0131] Example 1. A method, comprising: receiving, by a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, where the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration.

[0132] Example 2. The method according to example 1, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0133] Example 3. The method according to example 2, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding and layer information associated with third and fourth uplink reference signal resource sets, respectively; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field indicate, for the user equipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

[0134] Example 4. The method according to example 2, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

[0135] Example 5. The method according to example 4, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layer information associated with a first uplink reference signal resource set, wherein a value of the first transmit precoding matrix indicator codepoint field indicates a number of layers information also for a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

[0136] Example 6. The method according to example 4, wherein: a value of a second transmit precoding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicator codepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

[0137] Example 7. The method according to any one of examples 2 to 6, further comprising: determining, by the user equipment, that indicated layers of a first transmit precoding matrix indicator, a second transmit precoding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers { vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets; V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < Lmax2, where LmaX2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where Lmaxi is a maximum rank per a third of the uplink reference signal resource sets; and {V3.. .V4-1 } layers are indicated by a second reference signal resource identity, where V4 < LmaX4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0138] Example 8. The method according to any one of examples 2 to 6, further comprising: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

[0139] Example 9. The method according to example 1, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0140] Example 10. The method according to example 9, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers {V2,.. .,V3 -1 }, and {v3,...,V4-l } ,respectively, where values of V2, V3, and V4 indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

[0141] Example 11. The method according to example 9, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers { 0, . . . ,vi - 1 } , and { 0, . . . ,v 1 - 1 } , respectively; a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers {0,. . .,vi - 1 }, where vi corresponds to a number of layers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepoint field for a second reference signal resource identity indicates resources associated with layers [0,...,vi -1 }.

[0142] Example 12. The method according to any one of examples 9 to 11, further comprising: determining, by the user equipment, that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order {vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per a first of the multiple uplink reference signal resource sets; V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < Lmax2, where Lmax2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where Lmax3 is a maximum rank per a third of the uplink reference signal resource sets; and { V3. . .V4-I } layers are indicated by a second reference signal resource identity, where V4< Lmax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0143] Example 13. The method according to any one of examples 9 to 11, further comprising: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink.

[0144] Example 14. A method, comprising: sending, from a network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multiantenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and where the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

[0145] Example 15. The method according to example 14, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multipanel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0146] Example 16. The method according to example 15, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding and layer information associated with third and fourth uplink reference signal resource sets, respectively; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field indicate, for theuser equipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

[0147] Example 17. The method according to example 15, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

[0148] Example 18. The method according to example 17, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layer information associated with a first uplink reference signal resource set, wherein a value of the first transmit precoding matrix indicator codepoint field indicates a number of layers information also for a second transmit preceding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

[0149] Example 19. The method according to example 17, wherein: a value of a second transmit preceding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicator codepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

[0150] Example 20. The method according to any one of examples 16 to 19, wherein: it can be determined using the configuration that indicated layers of a first transmit precoding matrix indicator, a second transmit precoding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers { vi, V2, vs, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per a first of the multiple uplink reference signal resource sets; V2 layers areindicated via the second transmit precoding matrix indicator, where V2 < Lma.x2, where LmaX2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where LmaX3 is a maximum rank per a third of the uplink reference signal resource sets; and {V3. . .V4-I } layers are indicated by a second reference signal resource identity, where V4 < LmaX4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0151] Example 21. The method according to any one of examples 16 to 19, wherein: it can be determined using the configuration that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

[0152] Example 22. The method according to example 14, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0153] Example 23. The method according to example 22, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers { V2, . . . , V3 - 1 } , and { V3, . . . ,V4- 1 } , respectively, where values of V2, V3, and V4 indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

[0154] Example 24. The method according to example 22, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the userequipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers { 0, . . . , vi - 1 } , and { 0, . . . , v i - 1 } , respectively; a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers {0,. . ,,vi - 1 }, where vicorresponds to a number of layers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepoint field for a second reference signal resource identity indicates resources associated with layers {0,...,vi -l }.

[0155] Example 25. The method according to any one of examples 22 to 24, wherein: it can be determined using the configuration that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order {vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets; V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < Lmax2, where LmaX2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where LmaX3 is a maximum rank per a third of the uplink reference signal resource sets; and { V3. . .V4-I } layers are indicated by a second reference signal resource identity, where V4 < Lmax4, where LmaX4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0156] Example 26. The method according to any one of examples 14 to 25, wherein: the following can be determined using uplink reference signal resource sets and corresponding configuration: preceding and layer information for transmission-reception pointspecific uplink channel transmissions.

[0157] Example 27. A computer program, comprising instructions for performing the methods of any one of examples 1 to 26, when the computer program is run on an apparatus.

[0158] Example 28. The computer program according to example 27, wherein the computer program is a computer program product comprising a computer-readable medium bearing instructions embodied therein for use with the apparatus.

[0159] Example 29. The computer program according to example 27, wherein the computer program is directly loadable into an internal memory of the apparatus.

[0160] Example 30. An apparatus comprising means for performing: receiving, by a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency networkbased simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, where the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration.

[0161] Example 31. The apparatus according to example 30, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multipanel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0162] Example 32. The apparatus according to example 31, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding and layer information associated with third and fourth uplink reference signal resource sets, respectively; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field indicate, for the user equipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

[0163] Example 33. The apparatus according to example 31, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the userequipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

[0164] Example 34. The apparatus according to example 33, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layer information associated with a first uplink reference signal resource set, wherein a value of the first transmit precoding matrix indicator codepoint field indicates a number of layers information also for a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

[0165] Example 35. The apparatus according to example 33, wherein: a value of a second transmit precoding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicator codepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

[0166] Example 36. The apparatus according to any one of examples 31 to 35, wherein the means are further configured to perform: determining, by the user equipment, that indicated layers of a first transmit precoding matrix indicator, a second transmit precoding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers {vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets; V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < Lmax2, where LmaX2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where Lmax3 is a maximum rank per a third of the uplink reference signal resource sets; and {V3. . .V4-1 } layers are indicated by a second reference signal resource identity, where V4 < Lmax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0167] Example 37. The apparatus according to any one of examples 31 to 35, wherein the means are further configured to perform: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

[0168] Example 38. The apparatus according to example 30, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0169] Example 39. The apparatus according to example 38, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit preceding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers { V2, ... ,V3 - 1 } , and { V3, . . . , V4- 1 } , respectively, where values of V2, V3, and V4 indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

[0170] Example 40. The apparatus according to example 38, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers {0,...,vi -1 }, and {0,...,vi -l }, respectively; a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers (0,. . .,vi - 1 }, where vi corresponds to a number of layers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepointfield for a second reference signal resource identity indicates resources associated with layers {0,...,vi -l }.

[0171] Example 41. The apparatus according to any one of examples 38 to 40, wherein the means are further configured to perform: determining, by the user equipment, that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order {vi, V2, V3, V }, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per a first of the multiple uplink reference signal resource sets; V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < Lmax2, where LmaX2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where LmaX3 is a maximum rank per a third of the uplink reference signal resource sets; and {V3. . .V4-I } layers are indicated by a second reference signal resource identity, where V4 < LmaX4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0172] Example 42. The apparatus according to any one of examples 38 to 40, wherein the means are further configured to perform: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink.

[0173] Example 43. An apparatus comprising means for performing: sending, from a network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebookbased precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and wherethe antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

[0174] Example 44. The apparatus according to example 43, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multipanel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0175] Example 45. The apparatus according to example 44, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding and layer information associated with third and fourth uplink reference signal resource sets, respectively; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field indicate, for the user equipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

[0176] Example 46. The apparatus according to example 44, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

[0177] Example 47. The apparatus according to example 46, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layer information associated with a first uplink reference signal resource set, wherein a value of the first transmit precoding matrix indicator codepoint field indicates a number of layers information also for a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint fieldthat are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

[0178] Example 48. The apparatus according to example 46, wherein: a value of a second transmit precoding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicator codepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

[0179] Example 49. The apparatus according to any one of examples 45 to 48, wherein: it can be determined using the configuration that indicated layers of a first transmit precoding matrix indicator, a second transmit precoding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers { vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets; V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < LmaX2, where LmaX2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where LmaX3 is a maximum rank per a third of the uplink reference signal resource sets; and { V3. . .V4-I } layers are indicated by a second reference signal resource identity, where V4< Lmax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0180] Example 50. The apparatus according to any one of examples 45 to 48, wherein: it can be determined using the configuration that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

[0181] Example 51. The apparatus according to example 43, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating amulti-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

[0182] Example 52. The apparatus according to example 51, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers { V2, . . . , V3 - 1 } , and { V3, . . . , V4- 1 } , respectively, where values of V2, V3, and V4 indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

[0183] Example 53. The apparatus according to example 51, wherein: in response to the parameter being set to indicate four antenna panels and single-frequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers{0,. . ,,vi -1 }, and {0,. . ,,vi -1 }, respectively; a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers {0,. . ,,vi - 1 } , where vi corresponds to a number of layers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepoint field for a second reference signal resource identity indicates resources associated with layers {0,...,vi -l }.

[0184] Example 54. The apparatus according to any one of examples 51 to 53, wherein: it can be determined using the configuration that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order { vi, V2, V3, V4}, where vi, V2, V3, and V define indicated rank values according to the following: v, layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per afirst of the multiple uplink reference signal resource sets; V2 layers are indicated via the second transmit precoding matrix indicator, where V2< LmaX2, where Lm<W2 is a maximum rank per a second of the multiple uplink reference signal resource sets; V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where LmaX3 is a maximum rank per a third of the uplink reference signal resource sets; and { V3. . .V4-I } layers are indicated by a second reference signal resource identity, where V4 < LmaX4, where LmaX4 is a maximum rank per a fourth of the uplink reference signal resource sets.

[0185] Example 55. The apparatus according to any one of examples 43 to 54, wherein: the following can be determined using uplink reference signal resource sets and corresponding configuration: precoding and layer information for transmission-reception pointspecific uplink channel transmissions.

[0186] Example 56. The apparatus of any preceding apparatus example, wherein the means comprises: at least one processor; and at least one memory storing instructions that, when executed by at least one processor, cause the performance of the apparatus.

[0187] Example 57. The apparatus according to any one of examples 30 to 42, wherein the apparatus comprises a user equipment.

[0188] Example 58. The apparatus according to any one of examples 43 to 55, wherein the apparatus comprises a network element.

[0189] Example 59. A user equipment 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, by the user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook- based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration

[0190] Example 60. A network element 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: sending, from the network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook- based preceding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

[0191] As used in this application, the term “circuitry” may refer to one or more or all of the following:

[0192] (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and

[0193] (b) combinations of hardware circuits and software, such as (as applicable): (i) a combination of analog and / or digital hardware circuit(s) with software / firmware and (ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and

[0194] (c) hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.

[0195] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / orfirmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

[0196] Embodiments herein may be implemented in software (executed by one or more processors), hardware (e.g., an application specific integrated circuit), or a combination of software and hardware. In an example embodiment, the software (e.g., application logic, an instruction set) is maintained on any one of various conventional computer-readable media. In the context of this document, a “computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in FIG. 7. A computer-readable medium may comprise a computer-readable storage medium (e.g., memories 15, 75, 750, and 95 or other device) that may be any media or means that can contain, store, and / or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer. A computer-readable storage medium does not comprise propagating signals, and therefore may be considered to be non- transitory. The term “non-transitory”, as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM, random access memory, versus ROM, read-only memory).

[0197] If desired, the different functions discussed herein may be performed in a different order and / or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.

[0198] Although various aspects of the invention are set out in the independent claims, other aspects of the invention comprise other combinations of features from the described embodiments and / or the dependent claims with the features of the independent claims, and not solely the combinations explicitly set out in the claims.

[0199] It is also noted herein that while the above describes example embodiments of the invention, these descriptions should not be viewed in a limiting sense. Rather, there are several variations and modifications which may be made without departing from the scope of the present invention as defined in the appended claims.

[0200] The following abbreviations that may be found in the specification and / or the drawing figures are defined as follows:

[0201] 3GPP third generation partnership project

[0202] 5G fifth generation

[0203] AMF access and mobility management function

[0204] AP antenna port

[0205] CU central unit

[0206] CPE Customer premises equipment

[0207] CP-OFDM cyclic-prefix-orthogonal frequency division multiplexing

[0208] CW codeword

[0209] DCI Downlink Control Information

[0210] DFT-s-OFDM discrete-Fourier-transform-spread orthogonal frequency division multiplexing

[0211] DRMS demodulation reference signal

[0212] DU distributed unit

[0213] E-SMLC evolved serving mobile location center

[0214] FR1 frequency range 1

[0215] FR2 frequency range 2

[0216] FWA fixed wireless access

[0217] GMLC Gateway Mobile Location Center

[0218] eNB (or eNodeB) evolved Node B (e.g., an LTE base station)

[0219] gNB (or gNodeB) base station for 5G / NR

[0220] IAB Integrated Access and Backhaul

[0221] I / F interface

[0222] LMF Location Management Function

[0223] LTE long term evolution

[0224] M-DCI multi-DCI

[0225] MIMO multiple input, multiple output

[0226] MME mobility management entity

[0227] M-TRP multi-TRP

[0228] NF network function

[0229] ng or NG next generation

[0230] NR new radio

[0231] NRF Network Repository Function

[0232] N / W or NW network

[0233] PDCCH physical downlink control channel

[0234] PUSCH Physical Uplink Shared Channel

[0235] RAN radio access network

[0236] Rel release

[0237] RRC radio resource control

[0238] Rx or RX receiver or receive

[0239] S-DCI single DCI

[0240] SDM Spatial Domain Multiplexing

[0241] SFN single-frequency network

[0242] SGW serving gateway

[0243] SMF session management function

[0244] SRI SRS Resource Identity or Indicator

[0245] SRS Sounding Reference Signal

[0246] STx4P Simultaneous transmission by four panels

[0247] STxMP Simultaneous transmission by multiple panels

[0248] TCI Transmission Configuration Indicator

[0249] TDM time-division multiplexing

[0250] TPMI Transmit Precoding Matrix Indicator

[0251] TRP transmission-reception (or transmission and reception) point

[0252] TS technical standard

[0253] Tx transmitter

[0254] UDM unified data management

[0255] UDR unified data repository

[0256] UE user equipment (e.g., a wireless, typically mobile device)

[0257] UPF user plane function

Claims

What is claimed is:

1. A method, comprising: receiving, by a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebookbased precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration.

2. The method according to claim 1, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

3. The method according to claim 2, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, preceding and layer informationassociated with third and fourth uplink reference signal resource sets, respectively; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field indicate, for the user equipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

4. The method according to claim 2, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

5. The method according to claim 4, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layer information associated with a first uplink reference signal resource set, wherein a value of the first transmit preceding matrix indicator codepoint field indicates a number of layers information also for a second transmit preceding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

6. The method according to claim 4, wherein: a value of a second transmit precoding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicator codepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second referencesignal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

7. The method according to any one of claims 2 to 6, further comprising: determining, by the user equipment, that indicated layers of a first transmit preceding matrix indicator, a second transmit preceding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers { vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where V < maX2, where Lmaxi is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where Lnax3 is a maximum rank per a third of the uplink reference signal resource sets; and{ V3. . . V4- 1 } layers are indicated by a second reference signal resource identity, where V4 < LmaX4, where LmaX4 is a maximum rank per a fourth of the uplink reference signal resource sets.

8. The method according to any one of claims 2 to 6, further comprising: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

9. The method according to claim 1, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

10. The method according to claim 9, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers { V2, . . . , V3 - 1 } , and { va, . . . ,V4- 1 } , respectively, where values of V2, V3, and V4 indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

11. The method according to claim 9, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers {0,. ..,vi -1 }, and {0,...,vi -l }, respectively; a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers {0,. . .,vi -1 }, where vi corresponds to a number oflayers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepoint field for a second reference signal resource identity indicates resources associated with layers {0,...,vi -1 }.

12. The method according to any one of claims 9 to 11, further comprising: determining, by the user equipment, that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order { vi, V2, V3. V4}, where vi, V2, V3. and V4define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where V2< Lmax2, where Lmax2 is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where Lmax3 is a maximum rank per a third of the uplink reference signal resource sets; and{V3. . .V4-I } layers are indicated by a second reference signal resource identity, where V4 < Lmax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

13. The method according to any one of claims 9 to 11, further comprising: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and first,second, third and fourth uplink reference signal resource sets are configured in control information for uplink.

14. A method, comprising: sending, from a network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multiantenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmissionreception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

15. The method according to claim 14, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

16. The method according to claim 15, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing:values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding and layer information associated with third and fourth uplink reference signal resource sets, respectively; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field indicate, for the user equipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

17. The method according to claim 15, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

18. The method according to claim 17, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layer information associated with a first uplink reference signal resource set, wherein a value of the first transmit preceding matrix indicator codepoint field indicates a number of layers information also for a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

19. The method according to claim 17, wherein: a value of a second transmit precoding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicatorcodepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

20. The method according to any one of claims 16 to 19, wherein: it can be determined using the configuration that indicated layers of a first transmit precoding matrix indicator, a second transmit precoding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers { vi, V2, V3, V4}, where vi, V2, V3, and V define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where V2< Lmax2, where Lmax2 is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where Lmax3 is a maximum rank per a third of the uplink reference signal resource sets; and{ V3. . . V4- 1 } layers are indicated by a second reference signal resource identity, where V4 < Lmax4, where LmaX4 is a maximum rank per a fourth of the uplink reference signal resource sets.

21. The method according to any one of claims 16 to 19, wherein: it can be determined using the configuration that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicatorand the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

22. The method according to claim 14, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

23. The method according to claim 22, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers { V2, . . . , V3 - 1 } , and { V3, .. . ,V4- 1 } , respectively, where values of V2, V3, and V4 indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

24. The method according to claim 22, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers {0,. ..,vi -1 }, and {0,...,vi -l }, respectively;a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers {0,. . .,vi -1 }, where vi corresponds to a number of layers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepoint field for a second reference signal resource identity indicates resources associated with layers { 0, . . . ,vi - 1 } .

25. The method according to any one of claims 22 to 24, wherein: it can be determined using the configuration that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order { Vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where V2< Lmax2, where Lmax2 is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where Lmax3 is a maximum rank per a third of the uplink reference signal resource sets; and{V3...V4-I } layers are indicated by a second reference signal resource identity, where V4< Lmax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

26. The method according to any one of claims 14 to 25, wherein: the following can be determined using uplink reference signal resource sets and corresponding configuration: precoding and layer information for transmissionreception point-specific uplink channel transmissions.

27. A computer program, comprising instructions for performing the methods of any one of claims 1 to 26, when the computer program is run on an apparatus.

28. A user equipment 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, by the user equipment able to communicate with multiple transmissionreception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration29. A network element 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:sending, from the network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and four antenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebookbased precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

30. A user equipment comprising means for performing: receiving, by the user equipment able to communicate with multiple transmissionreception points using a set of between two and four antenna panels and from at least one of the multiple transmission-reception points, configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebook-based precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the antenna panels in the set are equipped with a same number of antenna ports; and transmitting, by the user equipment, to the multiple transmission-reception points over the uplink channel using the set of antenna panels based at least on the received configuration.

31. The user equipment according to claim 30, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

32. The user equipment according to claim 31, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding and layer information associated with third and fourth uplink reference signal resource sets, respectively; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field indicate, for the user equipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

33. The user equipment according to claim 31, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

34. The user equipment according to claim 33, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layerinformation associated with a first uplink reference signal resource set, wherein a value of the first transmit precoding matrix indicator codepoint field indicates a number of layers information also for a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

35. The user equipment according to claim 33, wherein: a value of a second transmit precoding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicator codepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

36. The user equipment according to any one of claims 31 to 35, wherein the means are further configured to perform: determining, by the user equipment, that indicated layers of a first transmit precoding matrix indicator, a second transmit precoding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers { Vi, V2, V3, V4}, where Vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < Lmax , where Lmax2 is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where Lmax3 is a maximum rank per a third of the uplink reference signal resource sets; and{V3...V4-I } layers are indicated by a second reference signal resource identity, where V4 < Linax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

37. The user equipment according to any one of claims 31 to 35, wherein the means are further configured to perform: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

38. The user equipment according to claim 30, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

39. The user equipment according to claim 38, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers { V2, . . . , V3 - 1 } , and { V3, . . . ,V4- 1 } , respectively,where values of V2, V3, and V indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

40. The user equipment according to claim 38, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers (0,. . . ,vi -1 }, and {0,...,vi -1 }, respectively; a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers {0,. . .,vi -1 }, where vi corresponds to a number of layers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepoint field for a second reference signal resource identity indicates resources associated with layers {0,. . ,,vi -1 }.

41. The user equipment according to any one of claims 38 to 40, wherein the means are further configured to perform: determining, by the user equipment, that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order { vi, V2, V3, V4}, where vi, V2, V3, and V4define indicated rank values according to the following:vi layers are indicated via the first transmit preceding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < LmaX2> where Lmax2 is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < LmaX3, where LmaX3 is a maximum rank per a third of the uplink reference signal resource sets; and{V3...V4-I } layers are indicated by a second reference signal resource identity, where V4< Lmax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

42. The user equipment according to any one of claims 38 to 40, wherein the means are further configured to perform: determining, by the user equipment, that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink.

43. The user equipment according to any one of claims 30 to 43, wherein the means comprises: at least one processor; and at least one memory storing instructions that, when executed by at least one processor, cause the performance of the apparatus.

44. A network element comprising means for performing: sending, from the network element to a user equipment able to communicate with multiple transmission-reception points using a set of between two and fourantenna panels, transmission-reception point configuration for one of spatial domain multiplexing-based or single-frequency network-based simultaneous multi-antenna panel transmission over an uplink channel with one of codebookbased precoding or non-codebook-based precoding, with a number of indicated different transmission configuration indicator states that correspond to a number of the antenna panels, wherein the sending uses at least one of the multiple transmission-reception points, and wherein the antenna panels in the set are equipped with a same number of antenna ports; and receiving, at the network element from the multiple transmission-reception points, transmission from the user equipment to the multiple transmission-reception points over the uplink channels using the antenna panels based at least on the sent configuration.

45. The network element according to claim 44, wherein: the configuration comprises indication of codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number of the antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

46. The network element according to claim 45, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding and layer information associated with third and fourth uplink reference signal resource sets, respective!''; and the values of a first transmit precoding matrix indicator codepoint field and a second transmit preceding matrix indicator codepoint field indicate, for the userequipment, precoding and layer information associated with first and second uplink reference signal resource sets, respectively.

47. The network element according to claim 45, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first reference signal resource identity codepoint field and a second reference signal resource identity codepoint field of the control information for uplink indicate separately, for the user equipment, precoding information associated with third and fourth uplink reference signal resource sets, respectively.

48. The network element according to claim 47, wherein a first transmit precoding matrix indicator codepoint field indicates, for the user equipment, precoding and layer information associated with a first uplink reference signal resource set, wherein a value of the first transmit precoding matrix indicator codepoint field indicates a number of layers information also for a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with second, third, and the fourth uplink reference signal resource sets, respectively.

49. The network element according to claim 47, wherein: a value of a second transmit precoding matrix indicator codepoint field indicates a number of layer information for a first transmit precoding matrix indicator codepoint field, a second transmit precoding matrix indicator codepoint field, a first reference signal resource identity codepoint field, and a second reference signal resource identity codepoint field that are associated with first, second, third, and the fourth uplink reference signal resource sets, respectively.

50. The network element according to any one of claims 46 to 49, wherein: it can be determined using the configuration that indicated layers of a first transmit precoding matrix indicator, a second transmit precoding matrix indicator, a first reference signal resource identity and a second reference signal resource identity are associated with indicated antenna ports for demodulated reference signals with a following order of layers { vi, V2, V3, V4}, where vi, V2, V3, and V define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxiis a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where NI < Lmax , where Lmax2 is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where Linax3 is a maximum rank per a third of the uplink reference signal resource sets; and{ V3. . . V4- 1 } layers are indicated by a second reference signal resource identity, where V4 < Lmax4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

51. The network element according to any one of claims 46 to 49, wherein: it can be determined using the configuration that associations between a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator and the first, second, third and fourth uplink reference signal resource sets are configured in control information for uplink received with a scheduling grant.

52. The network element according to claim 44, wherein: the configuration comprises indication of non-codebook-based precoding, a parameter indicating a multi-panel scheme to be used for transmission is set to a number ofthe antenna panels in the set, and a corresponding multiple of uplink reference signal resource sets that are configured in control information, for uplink, received with a scheduling grant.

53. The network element according to claim 52, wherein: in response to the parameter being set to indicate four antenna panels and spatial domain multiplexing: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources are associated with layers {V2,...,V3 -1 }, and {V3,.. .,V4-1 }, respectively, where values of V2, V3, and V4 indicate a number of layers that are associated with an indicated number of resources for codepoint fields in the following order: second reference signal resource identity, the first transmit precoding matrix indicator, and the second transmit precoding matrix indicator.

54. The network element according to claim 52, wherein: in response to the parameter being set to indicate four antenna panels and singlefrequency network: values of a first transmit precoding matrix indicator codepoint field and a second transmit precoding matrix indicator codepoint field of control information for uplink indicate separately, for the user equipment, one or more resources, where a number of indicated resources and a number of layers is a same set of layers { 0, . . . ,vi - 1 } , and { 0, . . . ,vi - 1 } , respectively; a value of a codepoint field for a first reference signal resource identity indicates for resources associated with layers {0,. . .,vi -1 }, where vi corresponds to a number of layers that are associated with indicated number of resources for the codepoint field reference signal resource identity; and a value of a codepoint field for a second reference signal resource identity indicates resources associated with layers {0, . . .,vi -1 } .

55. The network element according to any one of claims 52 to 54, wherein: it can be determined using the configuration that indicated layers of a first reference signal resource identity, a second reference signal resource identity, a first transmit precoding matrix indicator, a second transmit precoding matrix indicator are associated with indicated demodulation reference signal antenna ports with the following order { vi, V2, V3, V4}, where vi, V2, V3, and V4 define indicated rank values according to the following: vi layers are indicated via the first transmit precoding matrix indicator, where vi < Lmaxi, where Lmaxi is a maximum rank per a first of the multiple uplink reference signal resource sets;V2 layers are indicated via the second transmit precoding matrix indicator, where V2 < Lmax2, where LmaX2 is a maximum rank per a second of the multiple uplink reference signal resource sets;V3 layers are indicated via the first reference signal resource identity, where V3 < Lmax3, where LmaX3 is a maximum rank per a third of the uplink reference signal resource sets; and{ V3. . . V4-I } layers are indicated by a second reference signal resource identity, where V < LmaX4, where Lmax4 is a maximum rank per a fourth of the uplink reference signal resource sets.

56. The network element according to any one of claims 44 to 55, wherein: the following can be determined using uplink reference signal resource sets and corresponding configuration: preceding and layer information for transmissionreception point-specific uplink channel transmissions.

57. The network element according to any one of claims 44 to 56, wherein the means comprises: at least one processor; andat least one memory storing instructions that, when executed by at least one processor, cause the performance of the apparatus.

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