Dynamic indication of multi-trp pdsch transmission schemes

Abstract

Dynamic indication of multi-transmission / reception point (TRP) physical downlink shared channel (PDSCH) transmission is provided. A solution is proposed to use the antenna port field (e.g., demodulation reference signal (DM-RS) port indication field) in downlink control information (DCI) to jointly indicate the scheme and DM-RS ports for PDSCH transmission. When more than one transmission configuration indicator (TCI) state is indicated in the DCI, a new DM-RS table is used, where the DM-RS port allocation is also linked to the transmission scheme. The solution allows flexible PDSCH scheduling without introducing extra DCI overhead.

Description

[0001] Related Applications

[0002] This application claims the benefit of provisional patent application serial number 62 / 843,249, filed May 3, 2019, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to indication of downlink transmission schemes in a wireless communication network. BACKGROUND

[0004] Fifth generation (5G) mobile wireless communication systems, or New Radio (NR), support different sets of use cases and different sets of deployment scenarios. NR uses cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) in the downlink (DL) (i.e., from network node, new radio base station (gNB), enhanced or evolved NodeB (eNB), or other base station to user equipment (UE)) and both CP-OFDM and discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) in the uplink (UL) (i.e., from UE to gNB). In the time domain, NR DL and UL physical resources are organized into equally sized subframes, each of 1 millisecond (ms). Subframes are further divided into multiple slots of equal duration, each of 0.5 ms.

[0005] The slot length depends on the subcarrier spacing. For a subcarrier spacing of Af = 15 kilohertz (kHz), there is only one slot per subframe, and each slot is always composed of 14 orthogonal frequency division multiplexing (OFDM) symbols, regardless of the subcarrier spacing.

[0006] Figure 1 is a schematic diagram of an example NR time-domain data scheduling structure with 15 kHz subcarrier spacing. As shown, typical data scheduling in NR is on a per-slot basis, with the first two symbols containing a physical DL control channel (PDCCH) and the remaining 12 symbols containing a physical data channel (PDCH), which is either a physical DL shared channel (PDSCH) or a physical UL shared channel (PUSCH).

[0007] Different subcarrier spacing values are supported in NR. The supported subcarrier spacing (SCS) values (also referred to as different numerologies) are given by Af = (15 x 2 α ) kHz, where a e (0, 1, 2, 4, 8). Af = 15 kHz is the basic subcarrier spacing also used in long term evolution (LTE), corresponding to a slot duration of 1 ms. For a given SCS, the corresponding slot duration is

[0008] Figure 2is a schematic illustration of the basic NR physical time-frequency resource grid. In the definition of the physical resource in the frequency domain, the system bandwidth is divided into resource blocks (RBs), each of which corresponds to 12 contiguous subcarriers. In Figure 2 In the resource grid shown in

[0009] DL transmissions can be dynamically scheduled, i.e., in each time slot, the gNB transmits DL control information (DCI) through PDCCH about which UE data will be transmitted to and on which RBs and OFDM symbols in the current DL slot the data will be transmitted. PDCCH is typically transmitted in the first one or two OFDM symbols in each slot in NR. UE data is carried on PDSCH. The UE first detects and decodes PDCCH and if the decoding is successful, it decodes the corresponding PDSCH based on the decoded control information in the PDCCH.

[0010] UL data transmission can also be dynamically scheduled using PDCCH. Similar to DL, the UE first decodes the UL grant in PDCCH and then transmits data on PUSCH based on the decoded control information in the UL grant such as modulation order, coding rate, UL resource allocation, etc.

[0011] Reliable data transmission with multiple transmission points

[0012] Figure 3 is a schematic illustration of an example data transmission for increased reliability over multiple transmission / reception points (TRPs). Reliable data transmission with multiple panels or TRPs has been proposed in the Third Generation Partnership Project (3GPP) for Rel-16, where a data packet can be transmitted on multiple TRPs to achieve diversity. As shown in Figure 3 Two PDSCHs carry the same transport block (TB) but with the same or different redundancy versions (RVs) so that the UE can soft combine the two PDSCHs for more reliable reception, as shown in

[0013] Different schemes have been identified for PDSCH transmission from multiple TRPs, including:

[0014] • Single frequency network (SFN) with cyclic delay diversity (CDD)

[0015] • Spatial division multiplexing (SDM)

[0016] • Frequency domain multiplexing (FDM)

[0017] • Time domain multiplexing (TDM)

[0018] Figures 4A-4D is an illustration of different PDSCFI transmission schemes. Figure 4A shows a single TRP, Figure 4B shows SFN with CDD, Figure 4C shows SDM / FDM with single codeword (CW) and single RV, and Figure 4D shows SDM / FDM / TDM with two CWs, each with different RV (i.e., RV1 and RV2), referred to as multi-RV.

[0019] For SDM and FDM schemes, there are different sub-schemes depending on whether a CW with single RV or multiple CWs each with different RVs is used in the transmission. For TDM schemes, there can be slot-based or mini-slot-based sub-schemes.

[0020] Figure 5 is an illustration of an example slot-based TDM scheme for PDSCFI transmission on multiple TRPs. In 3GPP RAN1#96bis, it was agreed that both slot-based and mini-slot-based TDM schemes will be supported in NR Rel-16, where PDSCFI in consecutive slots or mini-slots can be transmitted from different TRPs. As shown in Figure 5 , 4 PDSCFI of the same TB are transmitted on 4 TRPs and in 4 consecutive slots. Each PDSCFI is associated with a different RV. The RV and TRP associated with each slot can be pre-configured or dynamically signaled.

[0021] Figure 6 is an illustration of an example data transmission on multiple TRPs under SDM scheme. The example SDM scheme has single RV, where PDSCFI with two spatial layers (one spatial layer from each TRP) is transmitted to the UE.

[0022] Figure 7A is an illustration of an example data transmission on multiple TRPs under FDM scheme. The example FDM scheme has single RV, where PDSCFI is transmitted from TRP1 in RB#0, 1, 4, 5, 8, 9 and from TRP2 in RB#2, 3, 6, 7, 10, 11.

[0023] Figure 7Bis a diagram of an example data transmission on multiple TRPs under an FDM multi-RV scheme. The example FDM multi-RV scheme has two PDSCH transmissions (PDSCH#1 and PDSCH#2) for the same TB from two TRPs to a UE. PDSCH#1 is transmitted from TRP1 in RB#0, 1, 4, 5 with RV#1 and PDSCH#2 is transmitted from TRP2 in RB#2, 3, 6, 7 with RV#2.

[0024] Figure 7C is a diagram of an example data transmission on multiple TRPs under a micro-slot based TDM scheme. The example TDM scheme has two PDSCH transmissions (PDSCH#1 and PDSCH#2) for the same TB from two TRPs to a UE. PDSCH#1 is transmitted from TRP1 in the first micro-slot with RV#1 and PDSCH#2 is transmitted from TRP2 in the second micro-slot with RV#2.

[0025] Quasi co-located (QCL) antennas

[0026] Several signals can be transmitted from the same base station antenna from different antenna ports. These signals can have the same large-scale properties, e.g., in terms of Doppler shift / spread, average delay spread, or average delay. These antenna ports are then said to be QCL.

[0027] The network can then signal to the UE that two antenna ports are QCL. If the UE knows that two antenna ports are QCL with respect to some parameter (e.g., Doppler spread), the UE can estimate that parameter based on one of the antenna ports and use that estimate when receiving the other antenna port. Typically, the first antenna port is represented by a measurement reference signal (RS) such as a channel state information RS (CSI-RS) (called the source RS) and the second antenna port is a demodulation RS (DM-RS) (called the target RS). This is useful for demodulation because when channel estimation is done with the DM-RS, the UE can know the properties of the channel in advance.

[0028] Information about what assumptions can be made with respect to QCL is signaled from the network to the UE. In NR, four types of QCL relationships between a transmitted source RS and a transmitted target RS are defined:

[0029] • Type A: {Doppler shift, Doppler spread, average delay, delay spread}

[0030] • Type B: {Doppler shift, Doppler spread}

[0031] • Type C: {average delay, Doppler shift}

[0032] • Type D: {spatial receive (Rx) parameters}

[0033] QCL Type D was introduced to facilitate beam management with analog beamforming and is referred to as spatial QCL. There is currently no strict definition of spatial QCL, but it is understood that if two transmitted antenna ports are spatially QCL, the UE can use the same Rx beam to receive them.

[0034] Transmission Configuration Indicator (TCI) state

[0035] For dynamic indication of PDSCH transmission on different TRPs or beams, the UE can be configured by radio resource control (RRC) signaling with a list of N TCI states, where N is up to 128 in frequency range 2 (FR2) and up to 8 in frequency range 1 (FR1), depending on UE capability.

[0036] Each TCI state contains QCL information, i.e., one or two source DL RS, each source RS is associated with a QCL type. The list of TCI states can be interpreted as a list of N possible TRPs or beams that the network can use to transmit PDSCH to the UE.

[0037] The network can activate up to eight active TCI states. For a given PDSCH transmission, the associated active TCI state(s) are signaled dynamically in the TCI field of the DCI in the corresponding PDCCH that schedules the PDSCH. In NR Rel-15, only one TCI state can be indicated. It has been agreed that up to two TCI states can be indicated in the DCI in NR Rel-16. The TCI state(s) indication from which TRP(s) the PDSCH is transmitted.

[0038] Demodulation Reference Signal (DM-RS)

[0039] The Demodulation Reference Signal is used for coherent demodulation of the physical layer data channel (PDSCH (DL) or PUSCH (UL)). The DM-RS is confined to the RBs carrying the associated physical layer channel and is mapped on allocated REs of the OFDM time-frequency grid so that the receiver can efficiently handle time / frequency selective fading radio channels.

[0040] The mapping of the DM-RS to the REs is configurable in both the frequency and time domain, with two mapping types in the frequency domain (configuration Type 1 or Type 2). The DM-RS mapping in the time domain can be single-symbol based or double-symbol based, with the latter meaning that the DM-RS is mapped in pairs of two adjacent symbols.

[0041] Figure 8Ais a diagram illustrating an example for configuration of single-symbol front-loaded DM-RS of Type 1. Figure 8B is a diagram illustrating an example for configuration of single-symbol front-loaded DM-RS of Type 2. Figure 8C is a diagram illustrating an example for configuration of double-symbol front-loaded DM-RS of Type 1. Figure 8D is a diagram illustrating an example for configuration of double-symbol front-loaded DM-RS of Type 2. Code division multiplexing (CDM) groups are indicated by different padding patterns. Type 1 and Type 2 differ in the mapping structure and the number of supported DM-RS CDM groups (i.e., Type 1 supports 2 CDM groups and Type 2 supports 3 CDM groups). The mapping structure of Type 1 is sometimes referred to as 2-comb structure, which has two CDM groups defined in the frequency domain by the sets of subcarriers {0, 2, 4,...} and {1, 3, 5,...}.

[0042] DM-RS antenna ports are mapped only to REs within one CDM group. For single-symbol DM-RS, two antenna ports can be mapped to each CDM group, while for double-symbol DM-RS, four antenna ports can be mapped to each CDM group. Thus, the maximum number of DM-RS ports for Type 1 is four or eight. The maximum number of DM-RS ports for Type 2 is six or twelve. An orthogonal cover code (OCC) of length 2 ([+1, +1], [+1, -1]) is used to separate antenna ports mapped on the same RE within a CDM group. The OCC is applied in the frequency domain and in the time domain when double-symbol DM-RS is configured.

[0043] In NR Rel-15, for a numerology index μ, the PDSCH DM-RS sequence r(m), m = 0, 1,... is mapped on antenna port p j and subcarrier k in OFDM symbol l for a single-symbol DM-RS configuration is specified in 3GPP Technical Specification (TS) 38.211 as

[0044]

[0045] k' = 0, 1

[0046]

[0047] n = 0, 1,...

[0048] where

[0049]

[0050] denotes the mapping in the frequency domain w f (k') and time domain w t (l') after applying the OCC in CDM group λ for port p jThe reference signal is mapped above. Tables 1 and 2 show the PDSCH DM-RS mapping parameters for configuration type 1 and type 2, respectively.

[0051] Table 1. PDSCH DM-RS mapping parameters for configuration type 1.

[0052]

[0053] Table 2. PDSCH DM-RS mapping parameters for configuration type 2.

[0054]

[0055] Antenna port indication table

[0056] The DCI contains a bit field that selects which antenna ports and the number of antenna ports (i.e., the number of data layers) are scheduled. For example, if port 1000 is indicated, the PDSCH is a single layer transmission and the UE will use the DM-RS defined by port 1000 to demodulate the PDSCH.

[0057] An example of DM-RS type 1 with a single front-loaded DM-RS symbol (maxLength = 1) is shown in Table 3 below. The DCI indicates the number and value of DM-RS ports. The value indicated in the DCI also indicates the number of CDM groups without data. If one CDM group without data is indicated, the REs of another CDM group without DM-RS will be used for the PDSCH. If two CDM groups without data are indicated, both CDM groups can contain DM-RS and no data is mapped to the OFDM symbols containing DM-RS.

[0058] Table 3. Antenna port(s) (1000 + DM-RS ports), dmrs-Type = 1, maxLength = 1

[0059]

[0060] For DM-RS type 1, ports 1000 and 1001 are in CDM group λ = 0 and ports 1002 and 1003 are in CDM group λ = 1. When two front-loaded symbols are configured, two additional DM-RS ports are available in each CDM group.

[0061] Table 4 shows the corresponding table for DM-RS type 2 with a single front-loaded DM-RS symbol.

[0062] Table 4. Antenna port(s) (1000 + DM-RS ports), dmrs-Type = 2, maxLength = 1

[0063]

[0064] For DM-RS Type 2, ports 1000 and 1001 are in CDM group l = 0, while ports 1002 and 1003 are in CDM group l = 1. Ports 1004 and 1005 are in CDM group l = 2. When two front-loaded symbols are configured, there are two additional DM-RS ports available in each CDM group. This is also shown in Table 2.

[0065] Table 5 and Table 6 are antenna port mapping tables for DM-RS with up to two front-loaded symbols.

[0066] Table 5. Antenna port(s) (1000 + DM-RS port), dmrs-Type = 1, maxLength = 2

[0067]

[0068] Table 6. Antenna port(s) (1000 + DM-RS port), dmrs-Type = 2, maxLength = 2

[0069]

[0070]

[0071] Mapping between TCI state and DM-RS CDM group

[0072] It has been agreed in 3GPP that each CDM group can only be mapped to one TCI state. In case two TCI states are indicated in the DCI and DM-RS ports in two CDM groups are signaled, the first TCI state is mapped to the first CDM group and the second TCI state is mapped to the second CDM group. In case Type 2 and DM-RS ports in 3 CDM groups are signaled in the DCI, then the mapping is still to be determined in 3GPP.

[0073] There are certain challenge(s) at present. One issue with using multi-TRP for reliable PDSCH transmission is how to dynamically indicate to the UE which scheme (i.e., SDM / TDM / FDM) is used for PDSCH transmission. SUMMARY

[0074] Dynamic indication of multi-transmission / reception point (TRP) physical downlink shared channel (PDSCH) transmission is provided. A solution is proposed that uses an antenna port field in downlink control information (DCI) (e.g., a demodulation reference signal (DM-RS) port indication field) to jointly indicate both the scheme and DM-RS ports for PDSCH transmission. When more than one transmission configuration indicator (TCI) state is indicated in the DCI, a new DM-RS table is used where the DM-RS port allocation is also linked to the transmission scheme. This solution enables flexible PDSCH scheduling without introducing additional DCI overhead.

[0075] Various embodiments are presented herein that address one or more of the issues discussed above. In some embodiments, a method for determining a PDSCH transmission scheme from a plurality of PDSCH transmission schemes performed by a wireless device in a wireless network is provided. The method includes receiving, from a network node, a list of configured TCI states and a plurality of antenna port tables; receiving a DCI including a TCI field and an antenna port field; determining a transmission scheme for a plurality of PDSCH transmissions based on the TCI field and the antenna port field in the DCI; and configuring the wireless device to receive the plurality of PDSCH transmissions according to the transmission scheme.

[0076] In some embodiments, the one or more antenna port tables includes a plurality of antenna port tables. In some embodiments, the method further includes optionally selecting a DM-RS port table from the plurality of antenna port tables based on one or more of: a number of indicated TCI states in the DCI, a configured DM-RS type, or a maximum number of front-loaded symbols for the plurality of PDSCH transmissions. In some embodiments, the antenna port field in the DCI indicates one or more DM-RS ports in one or more code division multiplexing (CDM) groups for the plurality of PDSCH transmissions according to the selected DM-RS port table. In some embodiments, configuring the wireless device to receive the plurality of PDSCH transmissions includes applying a plurality of TCI states and the one or more DM-RS ports when receiving the plurality of PDSCH transmissions.

[0077] In some embodiments, the DCI is received in DCI format 1-1 on a physical downlink control channel (PDCCH).

[0078] In some embodiments, the DCI further includes a redundancy version (RV) field; and the method further includes determining, based on the RV field in the DCI, an RV for each of the multiple PDSCH transmissions according to the determined transmission scheme. In some embodiments, the TCI field indicates multiple TCI states outside of the list of configured TCI states; and the RV field indicates multiple RVs from a set of pre-specified RV values. In some embodiments, the transmission scheme is a mini-slot based time division multiplexing (TDM) PDSCH repetition scheme in which a PDSCH is repeated in multiple non-overlapping mini-slots within a slot, with each repetition being associated with a different RV and a different TCI state. In some embodiments, the different TCI states associated with the PDSCH transmissions are indicated by the TCI field in the DCI; a first indicated TCI state is associated with a first PDSCH transmission of the multiple PDSCH transmissions; and a second indicated TCI state is associated with a second PDSCH transmission of the multiple PDSCH transmissions. In some embodiments, the first PDSCH transmission is received before the second PDSCH transmission.

[0079] In some embodiments, the transmission scheme is a frequency division multiplexing (FDM) multi-RV PDSCH repetition scheme in which a PDSCH is repeated in multiple non-overlapping frequency resources in a same slot, with each repetition being associated with a different RV and a different TCI state. In some embodiments, the different TCI states associated with the PDSCH transmissions are indicated by the TCI field in the DCI; a first indicated TCI state is associated with a first PDSCH transmission of the multiple PDSCH transmissions; and a second indicated TCI state is associated with a second PDSCH transmission of the multiple PDSCH transmissions. In some embodiments, the first PDSCH transmission is received on a first frequency domain resource having a starting resource block (RB) that has a smaller index value than a starting RB of a second frequency domain resource allocated for the second PDSCH transmission.

[0080] In some embodiments, determining the RV for each of the multiple PDSCH transmissions based on the RV field in the DCI includes determining different RVs according to the following table:

[0081]

[0082] In some embodiments, the transmission scheme includes one or more of: a spatial division multiplexing (SDM) scheme; a first FDM scheme with single RV; a second FDM scheme with multiple RVs; a mini-slot based TDM scheme; or a slot based TDM scheme.

[0083] In some embodiments, the transmission scheme includes one or more of: a combination of SDM and single-RV based FDM; a combination of single-RV based FDM and slot-based TDM; a combination of single-RV based FDM and mini-slot-based TDM; a combination of SDM and slot-based TDM; or a combination of SDM and mini-slot-based TDM.

[0084] In some embodiments, the method further includes receiving, from the antenna port field in the DCI, an assignment of two or more allocation tables for determining the transmission scheme.

[0085] In some embodiments, a method for signaling a transmission scheme in a wireless network is provided, the wireless network including a user equipment (UE) and a plurality of transmission / reception points (TRPs), where each transmission / reception point (TRP) is optionally associated with a TCI state. The method includes signaling at least two TCI states and at least two RVs in a DCI; and signaling, to the UE, a transmission scheme for a plurality of PDSCH transmissions via an antenna port field in the DCI.

[0086] In some embodiments, the method further includes assigning, for each PDSCH transmission of the plurality of PDSCH transmissions, an RV of the at least two RVs and a TCI state of the at least two TCI states; and transmitting the plurality of PDSCH transmissions according to the transmission scheme, the at least two TCI states, and the at least two RVs. In some embodiments, assigning, for each PDSCH transmission of the plurality of PDSCH transmissions, the RV of the at least two RVs and the TCI state of the at least two TCI states includes allocating different RVs and TCI states according to the following table:

[0087]

[0088] In some embodiments, the DCI is signaled to the UE in a DCI format 1-1 over a PDCCH.

[0089] In some embodiments, the antenna port field in the DCI further indicates one or more DM-RS ports in one or more CDM groups for the plurality of PDSCH transmissions. In some embodiments, in response to configuring the at least two TCI states, a value of the antenna port field is set according to a DM-RS port table. In some embodiments, the method further includes selecting the DM-RS port table based on one or more of: the at least two TCI states, a configured DM-RS type, or a maximum number of front-loaded symbols.

[0090] In some embodiments, the transmission scheme is a micro-slot based TDM scheme in which a PDSCH is repeated in multiple non-overlapping mini-slots within a slot, each repetition having a different RV and being associated with a different TCI state. In some embodiments, the method further includes indicating, in the DCI, the different TCI states associated with the multiple PDSCH transmissions, wherein a first indicated TCI state is associated with a first PDSCH transmission of the multiple PDSCH transmissions; and a second indicated TCI state is associated with a second PDSCH transmission of the multiple PDSCH transmissions. In some embodiments, the method further includes transmitting the first PDSCH transmission prior to transmitting the second PDSCH transmission.

[0091] In some embodiments, the transmission scheme is an FDM multi-RV PDSCH repetition scheme in which a PDSCH is repeated in multiple non-overlapping frequency resources in a same slot, where each repetition is associated with a different RV and a different TCI state. In some embodiments, the method further includes indicating, in the DCI, the different TCI states associated with the multiple PDSCH transmissions; wherein a first indicated TCI state is associated with a first PDSCH transmission of the multiple PDSCH transmissions; and a second indicated TCI state is associated with a second PDSCH transmission of the multiple PDSCH transmissions. In some embodiments, the method further includes transmitting the first PDSCH transmission on a first frequency domain resource having a starting RB with a smaller index value than a starting RB of a second frequency domain resource allocated for the second PDSCH transmission.

[0092] In some embodiments, the method further includes assigning two or more allocation tables to the UE for determining the transmission scheme. In some embodiments, the value of the antenna port field is set by: selecting one of the two or more allocation tables for the multiple PDSCH transmissions; and identifying one or more rows in the selected one of the allocation tables that indicate a desired transmission scheme. In some embodiments, entries of the two or more allocation tables depend on a capability of the UE to support one or more transmission schemes indicated by the two or more allocation tables. In some embodiments, the two or more allocation tables are signaled to the UE by higher layer signaling.

[0093] In some embodiments, the transmission scheme includes one or more of: an SDM scheme; a first FDM scheme with a single RV; a second FDM scheme with multiple RVs; a micro-slot based TDM scheme; or a slot based TDM scheme.

[0094] In some embodiments, the transmission scheme includes one or more of: a combination of SDM and single-RV based FDM; a combination of single-RV based FDM and slot-based TDM; a combination of single-RV based FDM and mini-slot-based TDM; a combination of SDM and slot-based TDM; or a combination of SDM and mini-slot-based TDM.

[0095] In some embodiments, a wireless device is adapted to perform the method of any of the above embodiments. In some embodiments, the wireless device comprises processing circuitry adapted to perform the method of any of the above embodiments.

[0096] In some embodiments, a base station is adapted to perform the method of any of the above embodiments.

[0097] In some embodiments, a method for determining a PDSCH transmission scheme from a plurality of PDSCH transmission schemes performed by a wireless device in a wireless network is provided. The method comprises receiving, from a network node, a configuration of a list of TCI states and one or more antenna port tables; receiving a DCI comprising a TCI field, an antenna port field, and an RV field; determining a transmission scheme for a plurality of PDSCH transmissions based on the TCI field and the antenna port field in the DCI; and configuring the wireless device to receive the plurality of PDSCH transmissions according to the transmission scheme.

[0098] In some embodiments, the one or more antenna port tables are a plurality of antenna port tables. In some embodiments, the method further comprises determining an antenna table among the plurality of antenna port tables based on a number of the TCI states indicated in a TCI field.

[0099] In some embodiments, the method further comprises interpreting the RV field according to the determined transmission scheme.

[0100] In some embodiments, a method for determining a PDSCH transmission scheme from a plurality of PDSCH transmission schemes performed by a wireless device in a wireless network is provided. The method comprises receiving, from a network node, a configuration of a list of TCI states and a plurality of antenna port tables; receiving a DCI comprising a TCI field, an antenna port field, and an RV field; determining an antenna table among the plurality of antenna port tables based on a number of the TCI states indicated in the TCI field; determining a transmission scheme for a plurality of PDSCH transmissions based on the TCI field and the antenna port field in the DCI; interpreting the RV field according to the determined transmission scheme; and configuring the wireless device to receive the plurality of PDSCH transmissions according to the transmission scheme.

[0101] In some embodiments, a method for determining a PDSCH transmission scheme from a plurality of PDSCH transmission schemes performed by a wireless device in a wireless network is provided. The method includes receiving a configuration of a list of TCI states and a plurality of antenna port tables from a network node; receiving a DCI including a TCI field, an antenna port field, and an RV field; determining a transmission scheme for a plurality of PDSCH transmissions based on the TCI field and the antenna port field in the DCI; determining an RV for each PDSCH transmission of the plurality of PDSCH transmissions based on the RV field according to the determined transmission scheme; and configuring the wireless device to receive the plurality of PDSCH transmissions according to the transmission scheme.

[0102] In some embodiments, a DM-RS port table is selected from the plurality of antenna port tables based also on a number of TCI states indicated in the DCI, a configured DM-RS type, and a maximum number of front-loaded symbols.

[0103] In some embodiments, a wireless device is adapted to perform the method of any of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0104] The accompanying drawings, which are incorporated in and form a part of the specification, illustrate several aspects of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0105] Figure 1 is a diagram of an example New Radio (NR) time-domain data scheduling structure with 15 kilohertz (kHz) subcarrier spacing.

[0106] Figure 2 is a diagram of a basic NR physical time-frequency resource grid.

[0107] Figure 3 is a diagram of an example data transmission on multiple transmission / reception points (TRPs) for increased reliability.

[0108] Figure 4A is a diagram of a single-TRP physical downlink shared channel (PDSCH) transmission scheme.

[0109] Figure 4B is a diagram of a single-frequency network (SFN) with a cyclic delay diversity (CDD) PDSCH transmission scheme.

[0110] Figure 4C is a diagram of spatial division multiplexing (SDM) / frequency domain multiplexing (FDM) with a single-codeword (CW) and single-redundancy version (RV) PDSCH transmission scheme.

[0111] Figure 4DThis is a schematic diagram of SDM / FDM / Temporal Multiplexing (TDM) with two CWs, each with a different RV (i.e., RV1 and RV2), known as a multi-RVPDSCFI transmission scheme.

[0112] Figure 5 This is a schematic diagram of an example time-slot-based TDM scheme for PDSCFI transmission over multiple TRPs.

[0113] Figure 6 This is a schematic diagram illustrating example data transmission across multiple TRPs under the SDM scheme.

[0114] Figure 7A This is a schematic diagram illustrating example data transmission across multiple TRPs under the FDM scheme.

[0115] Figure 7B This is a schematic diagram illustrating example data transmission across multiple TRPs in an FDM multi-RV scheme.

[0116] Figure 7C This is a schematic diagram illustrating example data transmission across multiple TRPs under a micro-slot-based TDM scheme.

[0117] Figure 8A This is a schematic diagram of an example of a single-symbol preload demodulation reference signal (DM-RS) for configuring type 1.

[0118] Figure 8B This is a schematic diagram of an example of configuring a single-symbol front-load DM-RS for type 2.

[0119] Figure 8C This is a schematic diagram of an example of configuring a dual-symbol front-load DM-RS for type 1.

[0120] Figure 8D This is a schematic diagram of an example of configuring a dual-symbol front-load DM-RS for type 2.

[0121] Figure 9 An example of a cellular communication network according to some embodiments of the present disclosure is shown.

[0122] Figure 10A This is a flowchart illustrating a method according to a particular embodiment.

[0123] Figure 10B It is shown Figure 10A A flowchart of an alternative embodiment of the method.

[0124] Figure 11A This is a flowchart illustrating a method according to a particular embodiment.

[0125] Figure 11B It is shown Figure 11Ais a flowchart illustrating alternative embodiments of a method.

[0126] Figure 12 is a flowchart illustrating a method according to certain embodiments.

[0127] Figure 13 is a schematic block diagram of a radio access node according to some embodiments of the disclosure.

[0128] Figure 14 is a schematic block diagram illustrating a virtualized embodiment of a radio access node according to some embodiments of the disclosure.

[0129] Figure 15 is a schematic block diagram of a radio access node according to some other embodiments of the disclosure.

[0130] Figure 16 is a schematic block diagram of a user equipment (UE) according to some embodiments of the disclosure.

[0131] Figure 17 is a schematic block diagram of a UE according to some other embodiments of the disclosure. DETAILED DESCRIPTION

[0132] The embodiments set forth below represent the best. of the inventors' current. understanding of the disclosure. Those skilled in the art will. understand, however, that the

[0133] Radio node: As used herein, a “radio node” is a radio access node or a wireless device.

[0134] Radio access node: As used herein, a “radio access node” or “radio network node” is any node in a radio access network of a cellular communications network that operates to wirelessly transmit and / or receive signals. Some examples of radio access nodes include, but are not limited to, a base station (e.g., a New Radio (NR) base station (gNB) in a Third Generation Partnership Project (3GPP) Fifth Generation (5G) NR network or an enhanced or evolved Node B (eNB) in a 3GPP Long Term Evolution (LTE) network), a high- power or macro base station, a low-power base station (e.g., a micro, pico, or femto base station, a home eNB, or the like), and a relay node.

[0135] Core network node: As used herein, a "core network node" is any type of node in a core network. Some examples of core network nodes include, e.g., a mobility management entity (MME), a packet data network gateway (P-GW), a service capability exposure function (SCEF), or the like.

[0136] Wireless device: As used herein, a "wireless device" is any type of device that has access to (i.e., is served by) a cellular communications network by wirelessly transmitting and / or receiving signals to a radio access node(s). Some examples of a wireless device include, but are not limited to, a user equipment device (UE) in a 3GPP network and a machine type communication (MTC) device.

[0137] Network node: As used herein, a "network node" is any node that is part of a core network or radio access network of a cellular communications network / system.

[0138] Note that the description given herein focuses on 3GPP cellular communications systems, and as such, 3GPP terminology or terminology similar to 3GPP terminology is often used. However, the concepts disclosed herein are not limited to 3GPP systems.

[0139] Note that in the description herein, references can be made to the term "cell"; however, especially with respect to 5G NR concepts, beams can be used instead of cells, and thus it is important to note that the concepts described herein are equally applicable to both cells and beams.

[0140] Figure 9One example of a cellular communications network 900 is shown in accordance with some embodiments of the present disclosure. In the example embodiments described herein, the cellular communications network 900 is a 5G NR network. In this example, the cellular communications network 900 includes base stations 902-1 and 902-2, which are referred to as eNBs in LTE and as gNBs in 5G NR, controlling corresponding macro cells 904-1 and 904-2. The base stations 902-1 and 902-2 are generally referred to herein collectively as base stations 902 and individually as base station 902. Likewise, the macro cells 904-1 and 904-2 are generally referred to herein collectively as macro cells 904 and individually as macro cell 904. The cellular communications network 900 can also include a plurality of low power nodes 906-1 through 906-4 controlling corresponding small cells 908-1 through 908-4. The low power nodes 906-1 through 906-4 can be small base stations such as pico or femto base stations or a remote radio head (RRH) or the like. Notably, while not shown, one or more of the small cells 908-1 through 908-4 can alternatively be provided by a base station 902. The low power nodes 906-1 through 906-4 are generally referred to herein collectively as low power nodes 906 and individually as low power node 906. Likewise, the small cells 908-1 through 908-4 are generally referred to herein collectively as small cells 908 and individually as small cell 908. The base stations 902 (and optionally the low power nodes 906) are connected to a core network 910.

[0141] The base stations 902 and low power nodes 906 serve wireless devices 912-1 through 912-5 in the corresponding cells 904 and 908. The wireless devices 912-1 through 912-5 are generally referred to herein collectively as wireless devices 912 and individually as wireless device 912. The wireless devices 912 are also sometimes referred to herein as UEs.

[0142] In the example aspects described herein, the cellular communications network 900 can use multiple transmission / reception points (TRPs) (e.g., base stations 902, low power nodes 906) for physical downlink shared channel (PDSCH) transmissions to increase reliability. However, conventional multi-TRP approaches lack a mechanism to dynamically indicate to a UE (e.g., wireless device 912) a transmission scheme for PDSCH transmissions in cases where more than one transmission configuration indication (TCI) state is used. The embodiments described below enable flexible PDSCH scheduling without introducing additional downlink control information (DCI) overhead. The embodiments described below with respect to Figures 10A-12 Example procedures for implementing flexible PDSCH scheduling are further described.

[0143] Dynamic indication of multi-TRP PDSCH schemes with demodulation reference signal (DM-RS) port indication In some embodiments described herein, the antenna port(s) field under DCI format 1-1 is used to indicate both the multi-TRP scheme for the scheduled PDSCH and the DM-RS ports used. More specifically, when more than one TCI state is indicated in the TCI field in the DCI scheduling the PDSCH, a new DM-RS port table is used for the maximum number of front-loaded symbols and the given DM-RS type. That is, which DM-RS port indication table (the legacy DM-RS port indication table or the new DM-RS port indication table) to use depends on whether the TCI field indicates a single or multiple TCI states, which means the interpretation of the DM-RS port indication field depends on the TCI field.

[0144] An example is shown in Table 7, where a “scheme” column is also included. The multi-TRP scheme is indicated by setting the corresponding value in the antenna port field in the DCI. For example, when the value of the antenna port field is in the range of 0 to 3, a spatial division multiplexing (SDM) scheme is indicated. The table assumes up to two spatial layers per TRP. Note that although the above discussion refers to DCI format 1-1, this embodiment can also be applied to other DCI formats that can include an antenna port field.

[0145] Table 7. Example of new DM-RS port table for DM-RS type 1 when more than one TCI state is indicated in the DCI.

[0146]

[0147] Similarly, new DM-RS tables for DM-RS type 1 with up to two front-loaded symbols and DM-RS type 2 with one and up to two front-loaded symbols can be introduced to indicate the multi-TRP scheme. Examples are shown in Tables 8-10.

[0148] Table 8. Example of new DM-RS port table for DM-RS type 1 with up to 2 front-loaded symbols.

[0149]

[0150] Table 9. Example of new DM-RS port table for DM-RS type 2 with up to 1 front-loaded symbol

[0151] Table 10. Example of new DM-RS port table for DM-RS type 2 with up to 2 front-loaded symbols

[0152]

[0153] For time domain multiplexing (TDM) and frequency domain multiplexing (FDM) with multiple redundancy versions (RVs), the RV sequence can be indicated by the RV field in the DCI. An example is shown in Table 11, where the RV to TCI state association is indicated by the RV field. TCI state #0 corresponds to the first TCI state indicated in the DCI. Up to 4 TCI states can be supported. For the TDM scheme, the first slot or mini-slot is associated with TCI state #0. That is, the interpretation of the RV field depends on whether the DM-RS port indication field indicates “FDM multi-RV”, where the interpretation of the DM-RS port indication field in turn depends on the TCI field.

[0154] Table 11. Example of using the RV field in the DCI to indicate the RV to TCI state association when more than one TCI state is indicated in the DCI.

[0155] RV field TCI state #0 TCI state #1 TCI state #2 TCI state #3 0 0 2 3 1 1 2 3 1 0 2 3 1 0 2 3 1 0 2 3

[0156] In the above example, we can note that for the particular case of FDM multi-RV based repetition, there can be some overlap between the RV indication and the multiple TCI state indication. For example, the combination of (TCI state, RV) = ((TCI-A, TCI-B, TCI-C, TCI-D), 1) would result in the same transmission as (TCI state, RV) = ((TCI-B, TCI-C, TCI-D, TCI-A), 0), where TCI-A / B / C / D correspond to TCI state #0 / 1 / 2 / 3, respectively. That is, if the order of the indicated TCI states belonging to the codepoint of the TCI field is allowed to be permuted, then it is possible to reuse the RV indicator (RVI) field to indicate another set of information. In one embodiment, the RV field is used to indicate different frequency domain resource allocations for the corresponding repetitions.

[0157] Dynamic indication of the combination of multi-TRP PDSCH scheme and DM-RS port indication

[0158] In some embodiments, the antenna port(s) field in DCI format 1-1 is used to indicate one or more combinations of multi-TRP scheme for the scheduled PDSCH and the used DM-RS port(s). The one or more combinations of multi-TRP scheme for the scheduled PDSCH can include any of the following options:

[0159] • Combination of SDM and FDM based on single RV.

[0160] • Combination of FDM based on single RV and TDM based on slot.

[0161] • Combination of FDM based on single RV and TDM based on mini-slot.

[0162] • A combination of SDM and slot-based TDM.

[0163] • A combination of SDM and mini-slot-based TDM.

[0164] Note that other multi-TRP scheme combinations not listed above are possible.

[0165] In this embodiment, when more than one TCI state is indicated in the transmission configuration indication field in the DCI scheduling the PDSCH, a new DM-RS port indication table is used for the maximum number of front-loaded symbols and the given DM-RS type.

[0166] An example is shown in Table 12, where the column ‘Scheme’ indicates one of the following depending on the value indicated in the antenna port field: SDM, a combination of SDM and slot-based TDM, or a combination of SDM and single-RV based FDM.

[0167] Table 12. Example of new DM-RS port table for DM-RS Type 1 when more than one TCI state is indicated in the DCI, which includes indicating a combination of multi-TRP schemes.

[0168]

[0169] In the example of Table 12, if the value indicated in the antenna port field is 6, two layers are transmitted in DM-RS ports 0 and 2 from two TRPs in one slot. In the next slot, a repetition of the same transport block (TB) possibly with different RVs is transmitted in DM-RS ports 0 and 2 from two TRPs with two layers. Thus, a combination of SDM and slot-based TDM is achieved, and the UE can know which combination is being used based on the value indicated in the antenna port field.

[0170] Similarly, in the example of Table 12, if the value indicated in the antenna port field is 11, three layers are transmitted in DM-RS ports 0, 2, and 3 from two TRPs in a set of resource blocks (RBs) in the frequency domain. In a second set of RBs in the frequency domain, a repetition of the same TB is again transmitted in DM-RS ports 0, 2, and 3 from two TRPs with three layers. Thus, a combination of SDM and single-RV based FDM is achieved, and the UE can know which combination is being used based on the value indicated in the antenna port field.

[0171] Although only two combinations are shown in the example of Table 12, this embodiment is non-limiting and any combination of the multi-TRP schemes discussed above can be indicated via the new DM-RS port table when multiple TCI states are indicated in the transmission configuration indication field in the TCI. Similar tables can be defined for DM-RS Type 1 with two front-loaded DM-RS symbols, DM-RS Type 2 with a single front-loaded DM-RS symbol, and DM-RS Type 2 with two front-loaded DM-RS symbols.

[0172] Note that although the above discussion relates to DCI format 1-1, this embodiment can also apply to other DCI formats that can include an antenna port field.

[0173] Dynamic indication of multi-TRP PDSCH schemes with restrictions on the values indicated in the antenna port field In some cases, which multi-TRP PDSCH scheme or combination of multi-TRP PDSCH schemes a UE supports can depend on the UE’s capabilities. The UE can indicate to the network via UE capability signaling which schemes or combination of schemes it supports. In this embodiment, a rule can be defined such that the UE only expects antenna port field values that indicate multi-TRP schemes that are supported by the UE.

[0174] Take the example in Table 7. A UE that is only capable of supporting single-RV FDM cannot support the other multi-TRP schemes listed in Table 7. In this case, the UE can expect the value of the antenna port field to be 9 or 10 when the transmission configuration indication field indicates two TCI states. If some other value is indicated in the antenna port field, the UE ignores the PDSCH transmission.

[0175] In a variant of this embodiment, the DM-RS port indication table itself depends on the UE’s capability signaling. For example, a first DM-RS port indication table is assigned to a UE that supports both single-RV FDM and slot-based TDM, while another second DM-RS port table is assigned to a UE that only supports single-RV FDM. In the case of a UE that only supports a single multi-TRP ultra-reliable low-latency communication (URLLC) scheme, more rows of the DM-RS port table can be utilized to indicate this scheme, which implies that more combinations of antenna ports and number of layers can be indicated. Alternatively, which DM-RS table to use can be a higher layer configured to the UE, such that for example even if a UE supports both single-RV FDM and slot-based TDM, it can be assigned a DM-RS port indication table that only includes entries indicating single-RV FDM and does not include entries indicating slot-based TDM. This higher layer configuration in turn can depend on the UE’s capability signaling, such that according to the UE’s capability signaling, the UE is not expected to be configured with a DM-RS port indication table that indicates a multi-TRP URLLC scheme that the UE does not support.

[0176] Figure 10A is a flowchart illustrating a method according to certain embodiments. The method can be performed by a UE. Optional features are indicated using dashed boxes. The method can optionally begin at step 1000, where an assignment of two or more allocation tables for determining a transmission scheme is received from an antenna port field in DCI. The method further includes step 1002, where a configured list of TCI states and one or more antenna port tables are received from a network node. The method further includes step 1004, where DCI including a TCI field and an antenna port field (and in some examples an RV field) is received. The method can optionally include step 1006, where an antenna table among the plurality of antenna port tables is determined based on a number of TCI states indicated in the TCI field. In some examples, determining the antenna table includes selecting a DM-RS port table from the plurality of antenna port tables based on one or more of: the number of TCI states indicated in the DCI, a configured DM-RS type, or a maximum number of front-loaded symbols for a plurality of PDSCH transmissions.

[0177] The method further includes step 1008, where a transmission scheme for a plurality of PDSCH transmissions is determined based on the TCI field and the antenna port field in the DCI. The method can optionally include step 1010, where an RV field in the DCI is interpreted according to the determined transmission scheme. In some examples, interpreting the RV field includes determining an RV for each of the plurality of PDSCH transmissions based on the RV field in the DCI according to the determined transmission scheme. The method further includes step 1012, where the wireless device is configured to receive the plurality of PDSCH transmissions according to the transmission scheme.

[0178] Figure 10B is a flowchart illustrating a method of Figure 10A alternative embodiments of. The method can be performed by a UE. The method begins at step 1014, where at least two DM-RS port allocation tables are configured for a given DM-RS type and a maximum value of front-loaded symbols. The method further includes step 1016, where a transmission scheme for a PDSCH transmission scheduled by a physical downlink control channel (PDCCH) is received via an antenna port field in DCI. The method further includes step 1018, where one of the two or more DM-RS port allocation tables is selected based on the transmission scheme. The method further includes step 1020, where the wireless device is configured to receive the PDSCH transmission according to the selected DM-RS port allocation table (e.g., based on the indicated TCI state and / or RV).

[0179] Figure 11Ais a flowchart illustrating a method according to certain embodiments. The method can be performed by a base station. Optional features are represented by dashed boxes. The method can optionally begin at step 1100, where two or more allocation tables are assigned to a UE for determining a transmission scheme. The method further includes step 1102, where at least two TCI states and at least two RVs are signaled in DCI. The method can optionally include step 1104, where for each of a plurality of PDSCH transmissions, an RV of the at least two RVs and a TCI state of the at least two TCI states are assigned. The method further includes step 1106, where a transmission scheme for the plurality of PDSCH transmissions is signaled to the UE via an antenna port field in the DCI.

[0180] The method can optionally include step 1108, where different TCI states associated with the plurality of PDSCH transmissions are indicated in the DCI. The method can optionally include step 1110, where the plurality of PDSCH transmissions are transmitted according to the transmission scheme, the at least two TCI states, and the at least two RVs. For a mini-slot based TDM scheme with multiple RVs, transmitting the plurality of PDSCH transmissions includes transmitting a first PDSCH transmission before transmitting a second PDSCH transmission. For a multiple RV FDM scheme, transmitting the plurality of PDSCH transmissions includes transmitting a first PDSCH transmission on a first frequency domain resource having a starting RB with a smaller index value than a starting RB of a second frequency domain resource allocated for a second PDSCH transmission.

[0181] Figure 11B is a flowchart illustrating a method of Figure 11A alternative embodiments. The method can be performed by a base station. The method begins at step 1112, where at least two DM-RS port allocation tables are configured for a given DM-RS type and a maximum value of front-loaded symbols. The method further includes step 1114, where a first transmission scheme for a first PDSCH scheduled by a PDCCH is signaled to the UE via a first antenna port field in DCI.

[0182] Figure 12 is a flowchart illustrating a method according to certain embodiments. The method can be performed in a wireless network including a UE and a plurality of TRPs. The method begins at step 1200, where at least two DM-RS port allocation tables are configured for a given DM-RS type and a maximum front-loaded symbol. The method further includes step 1202, where one or more transmission schemes for one or more PDSCHs scheduled by a PDCCH are signaled to the UE via an antenna port(s) field in DCI carried by the PDCCH.

[0183] Figure 13is a schematic block diagram of a radio access node 1300 according to some embodiments of the present disclosure. The radio access node 1300 can be, for example, a base station 902 or a low power node 906. As shown, the radio access node 1300 includes a control system 1302 that includes one or more processors 1304 (e.g., central processing units (CPUs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), and / or the like), memory 1306, and a network interface 1308. The one or more processors 1304 are also referred to herein as processing circuitry. In addition, the radio access node 1300 includes one or more radio units 1310 that each include one or more transmitters 1312 and one or more receivers 1314 coupled to one or more antennas 1316. The radio units 1310 can be referred to as, or be part of, radio interface circuitry. In some embodiments, the radio unit(s) 1310 are external to the control system 1302 and connected to the control system 1302 via, for example, a wired connection (e.g., an optical cable). However, in some other embodiments, the radio unit(s) 1310, and potentially the antenna(s) 1316 as well, are integrated with the control system 1302. The one or more processors 1304 operate to provide one or more functions of the radio access node 1300 as described herein. In some embodiments, the function(s) are implemented in software that is stored, for example, in memory 1306 and executed by the one or more processors 1304.

[0184] Figure 14 is a schematic block diagram illustrating a virtualized embodiment of a radio access node 1300 according to some embodiments of the present disclosure. This discussion is equally applicable to other types of network nodes. In addition, other types of network nodes can have similar virtualized architectures.

[0185] As used herein, a “virtualized” radio access node is an implementation of the radio access node 1300 in which at least a portion of the functionality of the radio access node 1300 is implemented as a virtual component(s) (e.g., via a virtual machine(s) executing on a physical processing node(s) in a network(s)). As illustrated, in this example, the radio access node 1300 includes a control system 1302 that includes one or more processors 1304 (e.g., CPUs, ASICs, FPGAs, and / or the like), memory 1306, and a network interface 1308, as well as one or more radio units 1310 that each include one or more transmitters 1312 and one or more receivers 1314 coupled to one or more antennas 1316, as described above. The control system 1302 is connected to the radio unit(s) 1310 via, for example, an optical cable or the like. The control system 1302 is connected to one or more processing nodes 1400 coupled to or included as part of a network(s) 1402 via the network interface 1308. Each processing node 1400 includes one or more processors 1404 (e.g., CPUs, ASICs, FPGAs, and / or the like), memory 1406, and a network interface 1408.

[0186] In this example, the functionality 1410 of the radio access node 1300 described herein is distributed across the control system 1302 and the one or more processing nodes 1400 or is implemented at the one or more processing nodes 1400 in any desired manner. In some particular embodiments, some or all of the functionality 1410 of the radio access node 1300 described herein is implemented as virtual components executed by one or more virtual machines implemented in a virtual environment(s) hosted by the processing node(s) 1400. As will be appreciated by one of ordinary skill in the art, additional signaling or communication is used between the processing node(s) 1400 and the control system 1302 in order to carry out at least some of the desired functionality 1410. Notably, in some embodiments, the control system 1302 can not be included, in which case the radio unit(s) 1310 communicate directly with the processing node(s) 1400 via an appropriate network interface(s).

[0187] In some embodiments, a computer program including instructions which, when executed by at least one processor, causes the at least one processor to carry out the functionality of radio access node 1300 according to any of the embodiments described herein, or a node (e.g., processing node 1400) implementing one or more functionalities 1410 of radio access node 1300 in a virtual environment, is provided. In some embodiments, a carrier containing the aforementioned computer program product is provided. The carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as memory).

[0188] Figure 15 is a schematic block diagram of a radio access node 1300 according to some other embodiments of the present disclosure. The radio access node 1300 includes one or more modules 1500, each of which is implemented in software. The module(s) 1500 provide the functionality of the radio access node 1300 described herein. This discussion is equally applicable to the processing node 1400 of Figure 14 , where the modules 1500 can be implemented at one of the processing nodes 1400, or distributed across multiple processing nodes 1400, and / or distributed across the processing node(s) 1400 and the control system 1302.

[0189] Figure 16 is a schematic block diagram of a UE 1600 according to some embodiments of the present disclosure. As shown, the UE 1600 includes one or more processors 1602 (e.g., CPUs, ASICs, FPGAs, and / or the like), memory 1604, and one or more transceivers 1606 including one or more transmitters 1608 and one or more receivers 1610 coupled to one or more antennas 1612. As will be appreciated by those skilled in the art, the transceiver(s) 1606 include radio-front end circuitry connected to the antenna(s) 1612 that is configured to condition signals communicated between the antenna(s) 1612 and the processor(s) 1602. The processor(s) 1602 are also referred to herein as processing circuitry. The transceiver(s) 1606 are also referred to herein as radio circuitry. In some embodiments, the functionality of the UE 1600 described above can be implemented fully or partially in software that is, for example, stored in the memory 1604 and executed on the processor(s) 1602. Note that the UE 1600 can include Figure 16Additional components, not shown, can also be included, such as one or more user interface components (e.g., input / output interfaces including a display, buttons, a touch screen, a microphone, a speaker(s), and / or the like, and / or any other components for allowing input of information into the UE 1600 and / or allowing output of information from the UE 1600), power supplies (e.g., battery and associated power circuitry), and the like.

[0190] In some embodiments, a computer program including instructions which, when executed by at least one processor, causes the at least one processor to carry out the functionality of a UE 1600 according to any of the embodiments described herein is provided. In some embodiments, a carrier containing the aforementioned computer program product is provided. The carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as memory).

[0191] Figure 17 is a schematic block diagram of a UE 1600 according to some other embodiments of the present disclosure. The UE 1600 includes one or more modules 1700, each of which is implemented in software. The module(s) 1700 provide the functionality of the UE 1600 described herein.

[0192] Any appropriate steps, methods, features, functions, or benefits disclosed herein can be performed through one or more functional units or modules of one or more virtual apparatuses. Each virtual apparatus can comprise a number of these functional units. These functional units can be implemented via processing circuitry, which can include one or more microprocessor or microcontrollers, as well as other digital hardware, which can include digital signal processors (DSPs), special-purpose computer chips, application- specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other digital hardware. The processing circuitry can be configured to execute program code stored in memory, which can include one or several types of memory such as read-only memory (ROM), random-access memory (RAM), cache memory, flash memory devices, optical storage devices, etc. Program code stored in memory includes program instructions for executing one or more telecommunications and / or data

[0193] While the processes in the diagrams can show a particular order of operations, it is understood that the order of operations can be changed, and that not all operations are required, and that other operations can be provided and / or performed between the operations shown in the diagrams. Moreover, it is understood that the operations of methods can overlap, and / or be performed concurrently, and / or in reverse order depending on implementation. Additionally, one or more of the processes depicted in the diagrams can be performed by one or more virtual apparatuses.

[0194] Group A embodiments

[0195] Embodiment 1 : A method performed by a wireless device for setting a transmission scheme, the method comprising one or more of: configuring at least two DM-RS port allocation tables for a given maximum of DM-RS types and front-loaded symbols; receiving, via a first antenna port field in DCI, a first transmission scheme for a first PDSCH scheduled by a PDCCH; selecting one of the at least two DM-RS port allocation tables based on the first transmission scheme; and configuring the wireless device to receive the first PDSCH according to the selected DM-RS port allocation table.

[0196] Embodiment 2: The method of embodiment 1, further comprising receiving, via a second antenna port field in DCI, a second transmission scheme for a second PDSCH scheduled by the PDCCH.

[0197] Embodiment 3: The method of any of embodiments 1-2, further comprising receiving a plurality of TCI states in a TCI field of the DCI; wherein each TCI state is associated with a TRP.

[0198] Embodiment 4: The method of any of embodiments 1-3, wherein the first transmission scheme can be one or more of: an SDM scheme; a first FDM scheme with single RV; a second FDM scheme with multiple RVs; a micro-slot based TDM scheme; or a slot based TDM scheme.

[0199] Embodiment 5: The method of any of embodiments 1-3, wherein the first transmission scheme can be one or more of: a combination of SDM and single RV based FDM; a combination of single RV based FDM and slot based TDM; a combination of single RV based FDM and micro-slot based TDM; a combination of SDM and slot based TDM; or a combination of SDM and micro-slot based TDM.

[0200] Embodiment 6: The method of any of the preceding embodiments, further comprising one or more of: providing user data; and forwarding the user data to a host computer via a transmission to a base station.

[0201] Group B embodiments

[0202] Embodiment 7: A method performed by a base station for signaling transmission schemes in a wireless network comprising a plurality of TRPs and UEs, the method comprising one or more of the following steps: configuring at least two DM-RS port allocation tables for a given maximum of DM-RS types and front-loaded symbols; and signaling to a UE, via a first antenna port field in DCI, a first transmission scheme for a first PDSCFI scheduled by a PDCCFI.

[0203] Embodiment 8: The method as in embodiment 7, further comprising signaling to the UE, via a second antenna port field in DCI, a second transmission scheme for a second PDSCFI scheduled by the PDCCFI.

[0204] Embodiment 9: The method as in any one of embodiments 7-8, wherein one of the at least two DM-RS port allocation tables is an existing table and the other is a new table.

[0205] Embodiment 10: The method as in embodiment 9, wherein each row of the new table contains a DM-RS port allocation and one or more transmission schemes.

[0206] Embodiment 11: The method as in any one of embodiments 9-10, wherein the first transmission scheme is determined by one or more of: using the antenna port field to identify a row in the new table; and identifying one or more transmission schemes contained in the row.

[0207] Embodiment 12: The method as in any one of embodiments 9-11, wherein the new table or entries of the new table depend on a capability of the UE to support one or more of the schemes.

[0208] Embodiment 13: The method as in any one of embodiments 9-12, wherein the new table is signaled to the UE by higher layer signaling.

[0209] Embodiment 14: The method as in any one of embodiments 7-13, wherein: the signaling further comprises signaling a plurality of TCI states in a TCI field of the DCI; and each TCI state is associated with a TRP.

[0210] Embodiment 15: The method as in any one of embodiments 7-14, wherein the first transmission scheme can be one or more of: an SDM scheme; a first FDM scheme with single RV; a second FDM scheme with multiple RVs; a micro-slot based TDM scheme; or a slot based TDM scheme.

[0211] Example 16: The method of any of Examples 7 to 14, wherein the first transmission scheme can be one or more of: a combination of SDM and single-RV based FDM; a combination of single-RV based FDM and slot-based TDM; a combination of single-RV based FDM and mini-slot-based TDM; a combination of SDM and slot-based TDM; or a combination of SDM and mini-slot-based TDM.

[0212] Example 17: The method of any of the preceding examples, further comprising one or more of: obtaining user data; and forwarding the user data to a host computer or a wireless device.

[0213] Example 18: A method of signaling a transmission scheme(s) in a wireless network comprising a plurality of TRPs and a UE, the method comprising one or more of: configuring at least two DM-RS port allocation tables for a given DM-RS type and maximum front-loaded symbol; and signaling to the UE one or more transmission schemes for one or more PDSCCHs scheduled by a PDCCFI via an antenna port(s) field in a DCI carried by the PDCCFI.

[0214] Example 19: The method of Example 18, wherein one of the at least two DM-RS port allocation tables is an existing table and the other one or more are new table(s).

[0215] Example 20: The method of Example 19, wherein each row of the new table contains a DM-RS port allocation and one or more transmission schemes.

[0216] Example 21 : The method of any of Examples 19 to 20, wherein the one or more transmission schemes are determined by first using the antenna port(s) field to identify a row in the new table and then identifying the one or more schemes contained in the row.

[0217] Example 22: The method of any of Examples 19 to 21, wherein the new table(s) or entries of the new table(s) can depend on a capability of the UE to support one or more of the schemes.

[0218] Example 23: The method of any of Examples 19 to 22, wherein the new table(s) are signaled to the UE by higher layer signaling.

[0219] Example 24: The method of any of Examples 17 to 23, wherein the signaling further comprises signaling a plurality of TCI states in a TCI field of the DCI, wherein each TCI state is associated with a TRP.

[0220] Example 25: The method as described in any one of Examples 18 to 24, wherein the transmission scheme may be one or more of the following: SDM scheme; FDM scheme with a single RV; FDM scheme with multiple RVs; TDM scheme based on micro-timeslots; or TDM scheme based on timeslots.

[0221] Example 26: The method as described in any one of Examples 18 to 25, wherein the transmission scheme may be one or more of the following: a combination of SDM and single-RV-based FDM; a combination of single-RV-based FDM and slot-based TDM; a combination of single-RV-based FDM and micro-slot-based TDM; a combination of SDM and slot-based TDM; or a combination of SDM and micro-slot-based TDM.

[0222] Group C Implementation Examples

[0223] Example 27: A wireless device comprising: a processing circuit system configured to perform any one of the steps in any one of the Group A embodiments; and a power supply circuit system configured to supply power to the wireless device.

[0224] Example 28: A base station comprising: a processing circuit system configured to perform any one of the steps in any one of the embodiments in Group B; and a power supply circuit system configured to supply power to the base station.

[0225] Example 29: A UE comprising: an antenna configured to transmit and receive wireless signals; a radio front-end circuit system connected to the antenna and a processing circuit system, configured to modulate signals transmitted between the antenna and the processing circuit system; the processing circuit system configured to perform any one of the steps in any one of the Group A embodiments; an input interface connected to the processing circuit system and configured to allow information to be input into the UE for processing by the processing circuit system; an output interface connected to the processing circuit system and configured to output information processed by the processing circuit system from the UE; and a battery connected to the processing circuit system and configured to supply power to the UE.

[0226] Example 30: A communication system including a host computer, comprising: a processing circuit system configured to provide user data; and a communication interface configured to forward the user data to a cellular network for transmission to a UE; wherein the cellular network includes a base station having a radio interface and a processing circuit system, the processing circuit system of the base station being configured to perform any one of the steps in any one of the embodiments in Group B.

[0227] Example 31: The communication system according to the foregoing examples also includes a base station.

[0228] Example 32: The communication system according to the first two examples further includes the UE, wherein the UE is configured to communicate with the base station.

[0229] Example 33: A communication system according to the first three examples, wherein: the processing circuitry of the host computer is configured to execute a host application to provide the user data; and the UE includes a processing circuitry configured to execute a client application associated with the host application.

[0230] Example 34: A method implemented in a communication system including a host computer, a base station, and a UE, the method comprising: providing user data at the host computer; and initiating, at the host computer, a transmission of the user data to the UE via a cellular network including the base station, wherein the base station performs any one of the steps in any one of the embodiments in Group B.

[0231] Example 35: The method according to the foregoing embodiments further includes transmitting the user data at the base station.

[0232] Example 36: The method according to the first two examples, wherein the user data is provided at the host computer by executing a host application, the method further includes executing a client application associated with the host application at the UE.

[0233] Example 37: A UE configured to communicate with a base station, the UE including a radio interface and a processing circuit system configured to perform the methods described in the first three examples.

[0234] Example 38: A communication system including a host computer, comprising: a processing circuit system configured to provide user data; and a communication interface configured to forward the user data to a cellular network for transmission to a UE; wherein the UE includes a radio interface and the processing circuit system, and components of the UE are configured to perform any one of the steps in any one of the embodiments in Group A.

[0235] Example 39: The communication system according to the foregoing embodiments, wherein the cellular network further includes a base station configured to communicate with the UE.

[0236] Example 40: A communication system according to the preceding two examples, wherein: the processing circuitry of the host computer is configured to execute a host application to provide the user data; and the processing circuitry of the UE is configured to execute a client application associated with the host application.

[0237] Example 41: A method implemented in a communication system including a host computer, a base station, and a UE, the method comprising: providing user data at the host computer; and initiating, at the host computer, a transmission carrying the user data to the UE via a cellular network including the base station, wherein the UE performs any one of the steps in any one of the embodiments in Group A.

[0238] Example 42: The method according to the foregoing embodiments further includes receiving the user data from the base station at the UE.

[0239] Example 43: A communication system including a host computer, comprising: a communication interface configured to receive user data originating from a transmission from a UE to a base station; wherein the UE includes a radio interface and a processing circuitry system configured to perform any one of the steps in any one of the embodiments in Group A.

[0240] Example 44: The communication system according to the foregoing embodiments further includes the UE.

[0241] Example 45: The communication system according to the first two examples further includes the base station, wherein the base station includes a radio interface configured to communicate with the UE and a communication interface configured to forward the user data carried by the transmission from the UE to the base station to the host computer.

[0242] Example 46: A communication system according to the first three examples, wherein: the processing circuitry of the host computer is configured to execute a host application; and the processing circuitry of the UE is configured to execute a client application associated with the host application, thereby providing the user data.

[0243] Example 47: A communication system according to the preceding four examples, wherein: the processing circuitry of the host computer is configured to execute a host application to provide requested data; and the processing circuitry of the UE is configured to execute a client application associated with the host application to provide user data in response to the requested data.

[0244] Example 48: A method implemented in a communication system including a host computer, a base station, and a UE, the method comprising: at the host computer, receiving user data transmitted from the UE to the base station, wherein the UE performs any one of the steps in any one of the embodiments in Group A.

[0245] Example 49: The method according to the foregoing embodiments further includes providing the user data to the base station at the UE.

[0246] Example 50: The method according to the first two examples further includes: at the UE, executing a client application to provide the user data to be transmitted; and at the host computer, executing a host application associated with the client application.

[0247] Example 51: The method according to the first three examples further includes: executing a client application at the UE; and receiving input data of the client application at the UE, the input data being provided at the host computer by executing a host application associated with the client application; wherein the user data to be transmitted is provided by the client application in response to the input data.

[0248] Example 52: A communication system including a host computer, the host computer including a communication interface configured to receive user data originating from a transmission from a UE to a base station, wherein the base station includes a radio interface and a processing circuitry system configured to perform any one of the steps in any one of the examples in Group B.

[0249] Example 53: The communication system according to the foregoing embodiments also includes the base station.

[0250] Example 54: The communication system according to the first two examples further includes the UE, wherein the UE is configured to communicate with the base station.

[0251] Example 55: A communication system according to the first three examples, wherein: the processing circuitry of the host computer is configured to execute a host application; and the UE is configured to execute a client application associated with the host application, thereby providing the user data to be received by the host computer.

[0252] Example 56: A method implemented in a communication system including a host computer, a base station, and a UE, the method comprising: at the host computer, receiving from the base station user data transmitted from the base station that has been received by the base station from the UE, wherein the UE performs any one of the steps in any one of the embodiments in Group A.

[0253] Example 57: The method according to the foregoing embodiments further includes receiving the user data from the UE at the base station.

[0254] Example 58: The method described in the first two examples further includes initiating the transmission of received user data to the host computer at the base station.

[0255] At least some of the following abbreviations may be used in this disclosure. In case of inconsistencies between abbreviations, preference should be given to how they are used above. If listed multiple times below, the first listing should be preferred over any subsequent listing(s).

[0256] ·3GPP Third Generation Partnership Program

[0257] 5G (Fifth Generation)

[0258] Application-Specific Integrated Circuits (ASICs)

[0259] CDD Cyclic Delay Diversity

[0260] • CDM (Code Division Multiplexing)

[0261] • CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing)

[0262] CPU (Central Processing Unit)

[0263] • CSI-RS Channel State Information Reference Signal

[0264] ·CW coding

[0265] DCI downlink control information

[0266] • DFT-S-OFDM (Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing) DL downlink

[0267] ·DM-RS demodulation reference signal

[0268] DSP (Digital Signal Processor)

[0269] • eNB Enhanced or Evolved Node B

[0270] FDM frequency domain multiplexing

[0271] FPGA (Field Programmable Gate Array)

[0272] FR1 Frequency range 1

[0273] FR2 frequency range 2

[0274] gNB New Radio Base Station

[0275] LTE Long Term Evolution

[0276] • MME (Mobility Management Entity)

[0277] • MTC Machine Type Communication

[0278] NF Network Functions

[0279] NR New Radio

[0280] OCC Orthogonal Cover Code

[0281] • OFDM (Orthogonal Frequency Division Multiplexing)

[0282] • PDCCH (Physical Downlink Control Channel)

[0283] ·PDCH (Physical Data Channel)

[0284] • PDSCH (Physical Downlink Shared Channel)

[0285] P-GW Packet Data Network Gateway

[0286] • PUSCH Physical Uplink Shared Channel

[0287] ·QCL Quasi-common Positioning

[0288] RAM (Random Access Memory)

[0289] RAN (Radio Access Network)

[0290] ·RB resource block

[0291] RE resource elements

[0292] ROM (Read-Only Memory)

[0293] • RRC Radio Resource Control

[0294] ·RRH Remote Radio Header

[0295] RS reference signal

[0296] ·RV Redundant Version

[0297] • RVI Redundancy Version Indicator

[0298] RX receiver

[0299] • SCEF service capability exposure function

[0300] • SCS subcarrier spacing

[0301] SDM (Space Division Multiplexing)

[0302] SFN Single-Frequency Network

[0303] ·TB transfer block

[0304] • TCI Transport Configuration Indicator

[0305] •TDM time-domain multiplexing

[0306] • TRP Transmit / Receive Point

[0307] TS Technical Specifications

[0308] UE (User Equipment)

[0309] ·UL uplink

[0310] URLLC (Ultra-Reliable Low-Latency Communication)

[0311] Those skilled in the art will recognize improvements and modifications to the embodiments of this disclosure. All such improvements and modifications are considered to be within the scope of the concepts disclosed herein.

Claims

1. A method performed by a wireless device (912) in a wireless network for determining a physical downlink shared channel, PDSCH, transmission scheme from a plurality of PDSCH transmission schemes, the method comprising: - receiving (1002), from a network node, a list of configured transmission configuration indicator, TCI, states and a plurality of antenna port tables; - receiving (1004) a downlink control information, DCI, comprising a TCI field and an antenna port field; - determining (1008) a transmission scheme for a plurality of PDSCH transmissions based on the TCI field and the antenna port field in the DCI; and - configuring (1012) the wireless device (912) to receive the plurality of PDSCH transmissions according to the determined transmission scheme, wherein the DCI further comprises a redundancy version, RV, field, wherein the method further comprises determining (1010) an RV for each of the plurality of PDSCH transmissions based on the RV field in the DCI according to the determined transmission scheme, and wherein determining (1010) the RV for each of the plurality of PDSCH transmissions based on the RV field in the DCI comprises determining different RVs according to the following table:

2. The method of claim 1, further comprising selecting (1006) a demodulation reference signal, DM-RS, port table from the plurality of antenna port tables based on one or more of: a number of TCI states in the DCI, a configured DM-RS type, or a maximum number of front-loaded symbols for the plurality of PDSCH transmissions.

3. The method of claim 2, wherein, The antenna port field in the DCI indicates one or more DM-RS ports in one or more code division multiplexing, CDM, groups for the plurality of PDSCH transmissions according to the selected DM-RS port table.

4. The method of claim 3, wherein, Configuring (1012) the wireless device (912) to receive the plurality of PDSCH transmissions comprises applying the TCI states and the one or more DM-RS ports when receiving the plurality of PDSCH transmissions.

5. The method of any one of claims 1 to 4, wherein, The DCI is received in DCI format 1-1 on a physical downlink control channel, PDCCH.

6. The method of any one of claims 1-4, wherein: - the TCI field indicates a plurality of TCI states outside of the list of configured TCI states; and - the RV field indicates a plurality of RVs from a set of pre-specified RV values.

7. The method of any one of claims 1 to 4, wherein, The transmission scheme is a micro-slot based time division multiplexing, TDM, PDSCH repetition scheme, wherein a PDSCH is repeated in a slot in a plurality of non-overlapping micro-slots, wherein each repetition is associated with a different RV and a different TCI state.

8. The method of claim 7, wherein: - the different TCI states associated with the PDSCH transmissions are indicated by the TCI field in the DCI; - a first indicated TCI state is associated with a first PDSCH transmission of the plurality of PDSCH transmissions; and - a second indicated TCI state is associated with a second PDSCH transmission of the plurality of PDSCH transmissions. - a second indicated TCI state is associated with a second PDSCH transmission of the plurality of PDSCH transmissions.

9. The method of claim 8, wherein, receiving the first PDSCH transmission before the second PDSCH transmission.

10. The method of any one of claims 1 to 4, wherein, the transmission scheme is a frequency division multiplexing, FDM, multi-RV PDSCH repetition scheme, wherein a PDSCH is repeated in multiple non-overlapping frequency resources in a same slot, wherein each repetition is associated with a different RV and a different TCI state.

11. The method of claim 10, wherein: - the different TCI states associated with the PDSCH transmissions are indicated by the TCI field in the DCI; - a first indicated TCI state is associated with a first PDSCH transmission of the plurality of PDSCH transmissions; and - a second indicated TCI state is associated with a second PDSCH transmission of the plurality of PDSCH transmissions.

12. The method of claim 11, wherein, receiving the first PDSCH transmission on a first frequency domain resource having a starting resource block, RB, with a smaller index value than a starting RB of a second frequency domain resource allocated for the second PDSCH transmission.

13. The method of any one of claims 1 to 4, wherein, the transmission scheme comprises one or more of: - a spatial division multiplexing, SDM, scheme; - a first frequency division multiplexing, FDM, scheme with a single redundancy version, RV; - a second FDM scheme with multiple RVs; - a time division multiplexing, TDM, scheme based on mini-slots; or - a TDM scheme based on slots.

14. The method of any one of claims 1 to 4, wherein, the transmission scheme comprises one or more of: - a combination of spatial division multiplexing, SDM, and frequency division multiplexing, FDM, based on a single redundancy version, RV; - a combination of FDM based on a single RV and time division multiplexing, TDM, based on slots; - a combination of FDM based on a single RV and TDM based on mini-slots; - a combination of SDM and TDM based on slots; or - a combination of SDM and TDM based on mini-slots.

15. The method of any one of claims 1 to 4, further comprising receiving (1000), from the antenna port field in the DCI, an assignment of two or more allocation tables for determining the transmission scheme.

16. A method performed by a base station (902) for signaling a transmission scheme in a wireless network, the wireless network comprising a user equipment, UE, and a plurality of transmission / reception points, TRPs, wherein each TRP is associated with a transmission configuration indication, TCI, state, the method comprising: - signaling (1102), in a downlink control information, DCI, at least two TCI states and at least two redundancy versions, RVs; and - signaling (1106), to the UE via an antenna port field in the DCI, a transmission scheme for a plurality of physical downlink shared channel, PDSCH, transmissions, wherein the method further comprises signaling, to the UE via a redundancy version, RV, field in the DCI, to determine, based on the RV field in the DCI, a RV for each PDSCH transmission of the plurality of PDSCH transmissions in accordance with the signaled transmission scheme, and wherein the method further comprises assigning (1104) a RV of the at least two RVs and a TCI state of the at least two TCI states for each of the plurality of PDSCH transmissions, including allocating different RVs and TCI states according to the following table:

17. The method of claim 16, further comprising: - transmitting (1110) the plurality of PDSCH transmissions according to the transmission scheme, the at least two TCI states, and the at least two RVs.

18. The method of claim 16, wherein, signaling the DCI to the UE in a DCI format 1-1 on a physical downlink control channel (PDCCH).

19. The method of any one of claims 16 to 18, wherein, The antenna port field in the DCI further indicates one or more demodulation reference signal (DM-RS) ports in one or more code division multiplexing (CDM) groups for the plurality of PDSCH transmissions.

20. The method of claim 19, wherein, In response to configuring the at least two TCI states, setting the value of the antenna port field according to a DM-RS port table.

21. The method of claim 20, further comprising selecting the DM-RS port table based on one or more of: the at least two TCI states, a configured DM-RS type, or a maximum number of front-loaded symbols.

22. The method of any one of claims 16 to 18, wherein, The transmission scheme is a micro-slot based time division multiplexing (TDM) scheme in which a PDSCH is repeated in multiple non-overlapping mini-slots within a slot, each repetition having a different redundancy version (RV) and being associated with a different TCI state.

23. The method of claim 22, further comprising indicating (1108) in the DCI the different TCI states associated with the plurality of PDSCH transmissions, wherein: - a first indicated TCI state is associated with a first PDSCH transmission of the plurality of PDSCH transmissions; and - a second indicated TCI state is associated with a second PDSCH transmission of the plurality of PDSCH transmissions.

24. The method of claim 23, further comprising transmitting (1110) the first PDSCH transmission prior to transmitting the second PDSCH transmission.

25. The method of any one of claims 16 to 18, wherein, The transmission scheme is a frequency division multiplexing (FDM) multiple RV PDSCH repetition scheme in which a PDSCH is repeated in multiple non-overlapping frequency resources in a same slot, where each repetition is associated with a different RV and a different TCI state.

26. The method of claim 25, further comprising indicating (1108) in the DCI the different TCI states associated with the plurality of PDSCH transmissions; wherein: - a first indicated TCI state is associated with a first PDSCH transmission of the plurality of PDSCH transmissions; and - a second indicated TCI state is associated with a second PDSCH transmission of the plurality of PDSCH transmissions.

27. The method of claim 26, further comprising transmitting (1110) the first PDSCH transmission on a first frequency domain resource having a starting resource block (RB) with a smaller index value than a starting RB of a second frequency domain resource allocated for the second PDSCH transmission.

28. The method of any one of claims 16 to 18, further comprising assigning (1100) to the UE two or more allocation tables for determining the transmission scheme.

29. The method of claim 28, wherein, a value of the antenna port field is set by: - selecting one of the two or more allocation tables for the plurality of PDSCH transmissions; and - identifying one or more rows in the selected one of the allocation tables indicating a desired transmission scheme.

30. The method of claim 28, wherein, an entry of the two or more allocation tables depends on a capability of the UE to support one or more transmission schemes indicated by the two or more allocation tables.

31. The method of claim 28, wherein, the two or more allocation tables are signaled to the UE by higher layer signaling.

32. The method of any one of claims 16 to 18, wherein, the transmission scheme comprises one or more of: - a spatial division multiplexing, SDM, scheme; - a first frequency division multiplexing, FDM, scheme with single redundancy version, RV; - a second FDM scheme with multiple RVs; - a time division multiplexing, TDM, scheme based on mini-slot; or - a TDM scheme based on slot.

33. The method of any one of claims 16 to 18, wherein, the transmission scheme comprises one or more of: - a combination of spatial division multiplexing, SDM, and frequency division multiplexing, FDM, based on single redundancy version, RV; - a combination of FDM based on single RV and time division multiplexing, TDM, based on slot; - a combination of FDM based on single RV and TDM based on mini-slot; - a combination of SDM and TDM based on slot; or - a combination of SDM and TDM based on mini-slot.

34. A wireless device (912) comprising: a processor; and a memory storing instructions that, when executed by the processor, adapt the wireless device to perform the method of any one of claims 1 to 15.

35. A wireless device (912) comprising processing circuitry adapted to perform the method of any one of claims 1 to 15.

36. A base station (902) comprising: a processor; and a memory storing instructions that, when executed by the processor, adapt the base station to perform the method of any one of claims 16 to 33.

37. A computer program product comprising instructions that, when executed by a processor, cause the processor to perform the method of any one of claims 1-33.

38. A computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the method of any one of claims 1-33.

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