WO2024079319A1 - Restriction de rang pour une transmission ul à panneaux multiples - Google Patents

Restriction de rang pour une transmission ul à panneaux multiples Download PDF

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Publication number
WO2024079319A1
WO2024079319A1 PCT/EP2023/078491 EP2023078491W WO2024079319A1 WO 2024079319 A1 WO2024079319 A1 WO 2024079319A1 EP 2023078491 W EP2023078491 W EP 2023078491W WO 2024079319 A1 WO2024079319 A1 WO 2024079319A1
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WIPO (PCT)
Prior art keywords
rank
srs resource
srs
transmission
network node
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PCT/EP2023/078491
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English (en)
Inventor
Andreas Nilsson
Sven JACOBSSON
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2024079319A1 publication Critical patent/WO2024079319A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present disclosure relates to wireless communications, and in particular, to rank restriction for multi-panel uplink (UL) transmission.
  • the Third Generation Partnership Project (3 GPP) has developed and is developing standards for Fourth Generation (4G) (also referred to as Long Term Evolution (LTE)) and Fifth Generation (5G) (also referred to as New Radio (NR)) wireless communication systems. Such systems provide, among other features, broadband communication between network nodes, such as base stations, and mobile wireless devices (WD), as well as communication between network nodes and between WDs.
  • 4G Fourth Generation
  • 5G Fifth Generation
  • NR New Radio
  • Such systems provide, among other features, broadband communication between network nodes, such as base stations, and mobile wireless devices (WD), as well as communication between network nodes and between WDs.
  • the 3GPP is also developing standards for Sixth Generation (6G) wireless communication networks. Beam management
  • NR transmission/reception points
  • DCI downlink control information
  • TCI transmission configuration indicator
  • spatial filtering weights refer to the antenna weights that are applied at either the transmitter (network node or WD) and the receiver (WD or network node) for data/control transmission/reception. This term is more general in the sense that different propagation environments lead to different spatial filtering weights that match the transmission/reception of a signal to the channel. The spatial filtering weights may not always result in a beam in a strict sense.
  • a training phase is required in order to determine the network node and WD spatial fdtering configurations. This is illustrated in FIG. 1 and is referred to in NR as downlink (DL) beam management.
  • DL downlink
  • FIG. 1 shows an example where CSI-RS is used to find an appropriate beam pair link (BPL), meaning a suitable network node transmit spatial filtering configuration (network node transmit (Tx) beam) plus a suitable WD receive spatial filtering configuration (UE Rx beam) resulting in sufficiently good link budget.
  • BPL beam pair link
  • FIG. 1 shows an example of a beam training phase followed by data transmission phase.
  • the network node For downlink data/control transmission, the network node indicates to the WD that the physical downlink control channel (PDCCH)/PDSCH demodulation reference signal (DMRS) is spatially quasi-co-located (QCL) with RS6 - the RS on which the WD performs measurements during the WD beam sweep in the beam training phase.
  • the network node indicates to the WD that RS6 is the spatial relation for the physical uplink control channel (PUCCH).
  • PUCCH physical downlink control channel
  • DMRS demodulation reference signal
  • the network node configures the WD to measure on a set of 5 CSI-RS resources (RSI .. RS5) which are transmitted with 5 different spatial filtering configurations (Tx beams).
  • the WD is also configured to report back the RS ID and the reference-signal receive power (RSRP) of the CSI-RS corresponding to the maximum measured RSRP.
  • the maximum measured RSRP corresponds to RS4. In this way the network node learns what is the preferred Tx beam from the WD perspective.
  • the network node transmits a number of CSI-RS resources in different orthogonal frequency division multiplexed (OFDM) symbols all with the same spatial filtering configuration (Tx beam) as was used to transmit RS4 previously.
  • the WD tests a different Rx spatial filtering configuration (Rx beam) in each OFDM symbol in order to maximize the received RSRP.
  • the WD remembers the RS ID (RS ID 6 in this example) and the corresponding spatial filtering configuration that results in the largest RSRP.
  • the network may then refer to this RS ID in the future when DL data is scheduled to the WD, thus allowing the WD to adjust its Rx spatial filtering configuration (Rx beam) to receive the PDSCH.
  • the RS ID is contained in a transmission configuration indicator (TCI) that is carried in a field in the DCI that schedules the PDSCH
  • TRP transmission/reception points
  • a PDSCH may be transmitted to a WD from multiple TRPs. Since different TRPs may be located in different physical locations and have different beams, the propagation channels may be different.
  • a WD may be configured by radio resource control (RRC) with multiple transmission configuration indicator (TCI) states.
  • RRC radio resource control
  • TCI transmission configuration indicator
  • a TCI state contains Quasi Co-location (QCL) information between the DMRS for PDSCH and one or two DL reference signals such as non-zero power (NZP) CSI-RS or synchronization signal block (SSB). Different NZP CSI-RSs or synchronization signal blocks (SSB) may be associated with different TRPs or beams.
  • the QCL information may be used by a WD to apply large scale channel properties associated with the DL reference signals (NZP CSLRS or SSB) to DMRS of PDSCH for channel estimation and PDSCH reception.
  • the supported QCL information types in NR may include:
  • a subset of the RRC configured TCI states may be activated by medium access control (MAC) control element (CE) for PDSCH. From the activated TCI states, one or two of them may be dynamically selected and indicated in the DCI scheduling a PDSCH depending on over which TRP(s) or beam(s) the PDSCH is transmitted.
  • Each codepoint of the TCI field in DCI may indicate either 1 TCI state or two TCI states.
  • a TCI field codepoint indicating 1 TCI state may be used to transmit PDSCH from a single TRP or single beam. If a TCI field codepoint indicates 2 TCI states, then PDSCH may be transmitted from two TRPs or two beams.
  • PUSCH Physical Uplink Shared Channel
  • CB-based precoding There are two transmission schemes specified for PUSCH: codebook (CB)-based precoding and non-codebook (NCB)-based precoding.
  • the network node configures, by radio resource control (RRC), the transmission scheme through the higher-layer parameter txConfigure in the PUSCH-Configure IE.
  • CB-based transmission may be used for non-calibrated WDs and/or for frequency division duplex (FDD) (i.e., uplink (UL)ZDL reciprocity does not need to hold).
  • FDD frequency division duplex
  • NCB-based transmission relies on UL/DL reciprocity and is, hence, intended for time division duplex (TDD).
  • TDD time division duplex
  • CB-based PUSCH is enabled if the higher-layer parameter txConfigure is set to ‘codebook’.
  • CB-based PUSCH transmission may be summarized in the following steps:
  • the WD transmits sounding reference signals (SRS), configured in an SRS resource set with higher-layer parameter usage in SRS-Configure IE set to ‘codebook’.
  • SRS sounding reference signals
  • the network node determines the number of layers (or rank) and a preferred precoder (i.e., transmission precoder matrix indicator (TPMI)) from a codebook subset based on the received SRS from one of the SRS resources.
  • the codebook subset is configured via the higher-layer parameter codebookSubset, based on reported WD capability, and is one of:
  • non-coh erent ‘noncoherent’
  • the network node indicates the selected SRS resource via a 1 -bit SRI field in the DCI scheduling the PUSCH transmission. If only one SRS resource is configured in the SRS resource set, the SRI field is not indicated in DCI;
  • the network node indicates, via DCI, the number of layers and the TPMI.
  • DM- RS port(s) associated with the layer(s) are also indicated in DCI.
  • the number of bits in DCI used for indicating the number of layers if transform precoding is enabled, the number of PUSCH layers is limited to 1) and the TPMI is determined as follows (unless UL full-power transmission is configured, for which the number of bits may vary):
  • the WD performs PUSCH transmission over the antenna ports corresponding to the SRS ports in the indicated SRS resource.
  • NCB-based UL transmission is for reciprocity-based UL transmission in which SRS precoding is derived at a WD based on CSI-RS received in the DL. Specifically, the WD measures received CSI-RS and deduces suitable precoder weights for SRS transmission(s), resulting in one or more (virtual) SRS ports, each corresponding to a spatial layer.
  • a WD may be configured up to four sounding reference signal (SRS) resources, each with a single (virtual) SRS port, in an SRS resource set with higher-layer parameter usage in SRS-Configure IE set to ‘nonCodebook’.
  • SRS sounding reference signal
  • a WD transmits the up to four SRS resources and the network node measures the UL channel based on the received SRS and determines the preferred SRS resource(s).
  • the network node indicates the selected SRS resources via the SRS resource indictor (SRI) field in DCI and the WD uses this information to precode PUSCH with a transmission rank that equals the number of indicated SRS resources (and, hence, the number of SRS ports).
  • SRI SRS resource indictor
  • the SRI field in DCI is determined as follows: bits, where /V SRS is the number of configured SRS resources in the SRS resource set configured by higher layer parameter srs-ResourceSetToAddModList, and associated with the higher layer parameter usage of value 'codeBook' or 'nonCodeBook': o bits according to Tables 7.3.1.1.2-
  • Lmax is given by that parameter
  • SRS is used for providing CSI to the network node in the UL.
  • the usage of SRS includes, e.g., deriving the appropriate transmission/reception beams and/or to perform link adaptation (i.e., setting the transmission rank and the modulation and coding scheme (MCS)), and for selecting DL (e.g., for PDSCH transmissions) and UL (e.g., for PUSCH transmissions) multiple input-multiple output (MIMO) precoding.
  • MCS modulation and coding scheme
  • the SRS is configured via RRC, where parts of the configuration may be updated (for reduced latency) through MAC-CE signaling.
  • the configuration includes, for example, the SRS resource allocation (the physical mapping and the sequence to use) as well as the time-domain behavior (aperiodic, semi-persistent, or periodic).
  • the RRC configuration does not activate an SRS transmission from the WD but instead, a dynamic activation trigger is transmitted from the network node in the DL via the DCI in the PDCCH which instructs the WD to transmit the SRS once, at a predetermined time.
  • the network node When configuring SRS transmissions, the network node configures, through the SRS-Configure information element (IE), a set of SRS resources and a set of SRS resource sets, where each SRS resource set contains one or more SRS resources.
  • IE SRS-Configure information element
  • Each SRS resource is configured with the following in RRC (for example see ASN code in 3GPP Technical Specification (TS) 38.331 version 16.1.0):
  • SRS -Resource SEQUENCE ⁇ srs-Resourceld SRS-Resourceld, nrofSRS-Ports ENUMERATED ⁇ portl, ports2, ports4 ⁇ , ptrs-Portlndex ENUMERATED ⁇ n0, nl ⁇ OPTIONAL, - Need R transmissionComb CHOICE ⁇ n2 SEQUENCE ⁇ combOffset-n2 INTEGER (0..1), cyclicShift-n2 INTEGER (0..7)
  • n4 SEQUENCE ⁇ combOffset-n4 INTEGER (0..3), cyclicShift-n4 INTEGER (0 . 11)
  • Need R resourceMapping-r!6 SEQUENCE ⁇ startPosition-r!6 INTEGER (0 . 13), nrofSymbols-rl6 ENUMERATED ⁇ nl, n2, n4 ⁇ , repetitionF actor-r 16 ENUMERATED ⁇ nl, n2, n4 ⁇ OPTIONAL
  • An SRS resource is configurable with respect to, e.g.:
  • the transmission comb (i.e., mapping to every 2nd or 4th subcarrier), configured by the RRC parameter transmissionComb, which may include one or more of: o
  • the comb offset, configured by the RRC parameter combOffset, is specified (i.e., which of the combs that should be used); o
  • cyclic shifts increases the number of SRS resources that may be mapped to a comb (as SRS sequences are designed to be (almost) orthogonal under cyclic shifts), but there is a limit on how many cyclic shifts that may be used (8 for comb 2 and 12 for comb 4);
  • the time-domain position within a given slot, configured with the RRC parameter resourceMapping which may include: o The time-domain start position, which is limited to be one of the last 6 symbols (in NR 3GPP Rel-15) or in any of the 14 symbols in a slot (in NR 3GPP Rel-16), configured by the RRC parameter startPosition; o The number of symbols for the SRS resource (that may be set to 1, 2 or 4), configured by the RRC parameter nrofSymbols; o The repetition factor (that may be set to 1, 2 or 4), configured by the RRC parameter repetitionF actor. When the repetition factor is larger than 1, the same frequency resources are used multiple times across symbols, used to improve the coverage as this allows more energy to be collected by the receiver;
  • the sounding bandwidth, frequency-domain position and shift, and frequencyhopping pattern of an SRS resource (i.e., which part of the transmission bandwidth that is occupied by the SRS resource) is set through the RRC parameters freqDomainPosition, freqDomain Shift, and the freqHopping parameters c-SRS, b- SRS, and b-hop.
  • the smallest possible sounding bandwidth is 4 RBs;
  • the RRC parameter resourceType determines whether the SRS resource is transmitted as periodic, aperiodic (singe transmission triggered by DCI), or semi persistent (same as periodic except for the start and stop of the periodic transmission is controlled through MAC-CE signaling instead of RRC signaling);
  • the RRC parameter sequenceld specifies how the SRS sequence is initialized
  • the RRC parameter spatialRelationlnfo configures the spatial relation for the SRS beam with respect to another RS (which may be another SRS, an SSB or a CSI-RS). If an SRS resource has a spatial relation to another SRS resource, then this SRS resource should be transmitted with the same beam (i.e., virtualization) as the indicated SRS resource.
  • FIG. 2 An illustration of how an SRS resource may be allocated in time and frequency within a slot (note that semi-persistent/periodic SRS resources typically span several slots), is provided in FIG. 2.
  • 3GPP Rel-16 the additional (and optional) RRC parameter resourceMapping-rl6 was introduced. If resourceMapping-rl6 is signaled, the WD will ignore the RRC parameter resourceMapping. The difference between resourceMapping-rl6 and resourceMapping is that the SRS resource (for which the number of OFDM symbols and the repetition factor is still limited to 4) may start in any of the 14 OFDM symbols in a slot configured by the RRC parameter startPosition-rl6.
  • An SRS resource set is configured with the following in RRC (for example, see ASN code in 3GPP TS 38.331 version 16.1.0).
  • SRS -ResourceSet SEQUENCE ) srs-ResourceSetld SRS-ResourceSetld, srs-ResourceldList SEQUENCE (SIZE(1. maxNrofSRS-
  • OPTIONAL Cond NonCodebook usage ENUMERATED ⁇ beamManagement, codebook, nonCodebook, antennaSwitching ⁇ , alpha Alpha OPTIONAL, -
  • SRS resource(s) will be transmitted as part of an SRS resource set, where all SRS resources in the same SRS resource set must share the same resource type.
  • An SRS resource set is configurable with respect to, e g.:
  • the slot offset is configured by the RRC parameter slotOffset and sets the delay from the PDCCH trigger reception to the start of the SRS transmission;
  • SRS resource sets may be configured with one of four different usages: ‘antennaSwitching’, ‘codebook’, ‘nonCodebook’ and ‘beamManagement’; o
  • An SRS resource set that is configured with usage ‘antennaSwitching’ is used for reciprocity-based DL precoding (i.e., used to sound the channel in the UL so that the network node may use reciprocity to set a suitable DL precoders).
  • the WD is expected to transmit one SRS port per WD antenna port; o
  • An SRS resource set that is configured with usage ‘codebook’ is used for CB- based UL transmission (i.e., used to sound the different WD antennas and help the network node to determine/signal a suitable UL precoder, transmission rank, and MCS for PUSCH transmission).
  • An SRS resource set that is configured with usage ‘nonCodebook’ is used for NCB-based UL transmission.
  • the WD transmits one SRS resource per candidate beam (suitable candidate beams are determined by the WD based on CSI-RS measurements in the DL and, hence, reciprocity needs to hold).
  • the network node may then, by indicating a subset of these SRS resources, determine which UL beam(s) that the WD should apply for PUSCH transmission.
  • One UL layer will be transmitted per indicated SRS resource.
  • An SRS resource set that is configured with usage ‘beamManagemenf is used (mainly for frequency bands above 6 GHz (i.e., for FR2)) to evaluate different WD beams for analog beamforming arrays.
  • the WD transmits one SRS resource per analog beam, and the network node will perform an RSRP measurement per transmitted SRS resource and, in this way, determine a suitable WD beam that is reported to the WD. It is expected that the network node configures one SRS resource set with usage ‘beamManagemenf for each analog array (i.e., panel) that the WD has; and
  • the associated CSI-RS (this configuration is only applicable for NCB-based UL transmission) for each of the possible resource types: o For an aperiodic SRS, the associated CSI-RS resource is set by the RRC parameter csi-RS; and o For semi-persistent/periodic SRS, the associated CSI-RS resource is set by the RRC parameter associatedCSLRS; and
  • the PC parameters e.g., alpha and pO are used for setting the SRS transmission power.
  • SRS has its own UL PC scheme in NR (see 3GPP TS 38.213 V17.3.0 for further details), which specifies how the WD should split the available output power between two or more SRS ports during one SRS transmit occasion (an SRS transmit occasion is a time window within a slot where SRS transmission is performed).
  • the SRS resource-set configuration determines, e.g., usage, power control, and slot offset for aperiodic SRS.
  • the SRS resource configuration determines the time-and-frequency allocation, the periodicity and offset, the sequence, and the spatial-relation information.
  • TRPs Transmission to Multiple Transmission/Reception Points
  • PDSCH transmission with multiple transmission points has been introduced in 3 GPP for NR 3GPP Rel-16, in which a transport block may be transmitted over multiple TRPs to improve transmission reliability.
  • UL enhancement with multiple TRPs is introduced by transmitting a PUSCH towards to different TRPs. This is shown in FIG. 3 at different times (i.e., PUSCH transmissions to different TRPs are transmitted in time division multiplexed, TDM, fashion).
  • multiple PUSCH transmissions each towards a different TRP may be scheduled by a single DCI.
  • An example of PUSCH repetitions is shown in FIG. 4 where two PUSCH repetitions for a same transport block (TB) are scheduled by a single DCI, each PUSCH occasion is transmitted towards a different TRP.
  • TB transport block
  • 3GPP Rel-17 multi-TRP PUSCH, 3GPP Rel-16 single TRP based type A and type B PUSCH repetitions are extended to two TRPs or two beams. The two beams are mapped to different PUSCH repetitions with either a cyclical mapping pattern or a sequential mapping pattern.
  • cyclic mapping pattern the first and second beams are applied to the first and second PUSCH repetitions, respectively, and the same beam mapping pattern continues to the remaining PUSCH repetitions.
  • Cyclic mapping is used in case of two repetitions. For more than 2 repetitions, cyclic mapping is a WD capability.
  • the first beam is applied to the first and second PUSCH repetitions
  • the second beam is applied to the third and fourth PUSCH repetitions
  • the same beam mapping pattern continues to the remaining PUSCH repetitions.
  • FIG. 5 An example is shown in FIG. 5 for a cyclic mapping pattern and FIG. 6 for a sequential mapping pattern.
  • Type B PUSCH repetition the mapping is done based on nominal repetitions.
  • Both codebook based and non-codebook based PUSCH are supported with multi- TRP PUSCH.
  • Two SRS resource sets are introduced for the purpose. The same number SRS resources should be configured in the two SRS resource sets.
  • SRIs SRS resource indicators
  • TPMIs transmit precoding matrix indicators
  • DCI type 1 CG
  • additional SRI and TPMI fields are included in CG configuration.
  • the number of SRS ports indicated by the two SRIs should be the same.
  • Dynamic switching between multi-TRP and single-TRP PUSCH operation is supported with a new 2 bit field in DCI as shown in Table 1.
  • the TRP towards which the first PUSCH repetition is transmitted may also be indicated with codepoint “10” for the first TRP or “11” for the second TRP.
  • the new 2 bit field in DCI is referred to as ‘ SRS resource set indicator’ field in 3GPP TS 38.212 V17.0.0.
  • Table 1 A new DCI field for dynamic switching between single TRP and multi- TRP PUSCH
  • the SRS resource set with lower ID is the first SRS resource set, and the other SRS resource set is the second SRS resource set. Association of a SRS resource set to a PUSCH transmission occasion
  • the WD will repeat the TB (Transport Block) across the K consecutive slots applying the same symbol allocation in each slot, and the association of the first and second SRS resource set in srs-ResourceSetToAddModList or srs-ResourceSetToAddModListDCI-0-2 to each slot may be determined as follows: if a DCI format 0 1 or DCI format 0 2 indicates codepoint "00" for the SRS resource set indicator, the first SRS resource set is associated with all K consecutive slots; if a DCI format 0 1 or DCI format 0 2 indicates codepoint "01" for the SRS resource set indicator, the second SRS resource set is associated with all K consecutive slots; if a DCI format 0 1 or DCI format 0 2 indicates codepoint " 10" for the SRS resource set indicator, the first and second SRS resource set association to K consecutive slots is determined as follows:
  • the first and second SRS resource sets are applied to the first and second slot of 2 consecutive slots, respectively;
  • the first and second SRS resource sets are applied to the first and second slot of K consecutive slots, respectively, and the same SRS resource set mapping pattern continues to the remaining slots of K consecutive slots;
  • first SRS resource set is applied to the first and second slots of K consecutive slots
  • second SRS resource set is applied to the third and fourth slot of K consecutive slots
  • same SRS resource set mapping pattern continues to the remaining slots of K consecutive slots:
  • a DCI format 0 1 or DCI format 0 2 indicates codepoint "11" for the SRS resource set indicator, and the first and second SRS resource set association to K consecutive slots is determined as follows:
  • the second and first SRS resource sets are applied to the first and second slot of K consecutive slots, respectively, and the same SRS resource set mapping pattern continues to the remaining slots of the K consecutive slots;
  • the second SRS resource set is applied to the first and second slot of K consecutive slots, and the first SRS resource set is applied to the third and fourth slot of K consecutive slots, and the same SRS resource set mapping pattern continues to the remaining slots of the K consecutive slots.
  • the SRS resource set association to nominal PUSCH repetitions follows the same method as SRS resource set association to slots in PUSCH Type A repetition by considering nominal repetitions instead of slots.
  • the size (and interpretation) of the TPMI field/SRI field in DCI 0 1 and DCI 0 2 depends on for example the maximum rank that the WD may be configured with for the associated PUSCH, i.e., the configured value of the parameter “maxRank” in PUSCH-configure (for example, as specified in 3GPP TS 38.331 V17.2.0) for codebook based UL transmission, and on the configured value of the parameter “maxMIMO-Layers” in PUSCH-ServingCellConfigure (as specified in 3GPP TS 38.331 V17.2.0) for non-codebook based UL transmission.
  • the size of the temporary multi-media identity (TPMI)/scheduling request indicator (SRI) field for codebook-based UL transmission also depends on the number of SRS port/SRS resources configured in an SRS resource set for usage ‘codebook’ and in a similar way the size of the SRI field for non-codebook-based UL transmission also depends on the number of SRS resources configured in an SRS resource set for usage ‘nonCodebook’.
  • Some embodiments advantageously provide methods, network nodes and wireless devices for rank restriction for multi-panel uplink (UL) transmission.
  • This disclosure describes several methods to configure the maximum rank for STxMP operation, for example by indicating maximum rank, and/or minimum rank, and/or the available ranks per SRS resource set or combined over both SRS resource sets, considering different UL transmission schemes (like STxMP SDM, STxMP single frequency network (SFN), etc.).
  • different UL transmission schemes like STxMP SDM, STxMP single frequency network (SFN), etc.
  • a WD panel supports more than 2 layers per panel, which is likely to be the maximum number of layers per panel considered in NR for STxMP.
  • some of the embodiments disclosed herein may be relevant also for 6G, since it is expected that downlink control signaling (similar to downlink control information (DCI) in NR) overhead for rank and precoder indication for UL data transmission for such high-capable WDs will be a larger issue.
  • DCI downlink control information
  • the DCI overhead may be reduced for PUSCH transmission. Also, the interpretation of the codepoints of the TPMI/SRI fields in DCI will be clarified for the WD (removes potential ambiguity).
  • a WD configured to communicate with a network node.
  • the WD is configured to receive, from the network node, a downlink control information, DCI, message that carries two fields each of which includes a rank indicator for one of two sounding reference signal (SRS) resource sets configured for the WD.
  • DCI downlink control information
  • the WD is also configured to determine a rank for each of the two SRS resource sets of the WD based at least in part on the rank indicator.
  • the two fields are sounding reference signal resource indicator, SRI, fields for non-codebook operation.
  • the two fields are transmit precoder matrix indicator, TPMI, fields for codebook operation.
  • determining a rank for each of the two SRS resource sets of the WD is further based at least in part on a maximum supported rank per SRS resource set of the WD.
  • the WD is configured to receive, a single parameter indicating the maximum supported rank per SRS resource set of the WD, wherein the single parameter applies to both of the two SRS resource sets.
  • the single parameter indicates a maximum rank per SRS resource set for SFN Simultaneous multi-panel transmission (STxMP) operation.
  • STxMP Simultaneous multi-panel transmission
  • each SRS resource set is associated with a corresponding panel of the WD which is capable of STxMP operation.
  • a first SRS resource set is associated with a first transmission configuration indicator, TCI, state and a first transmission precoder matrix indicator/SRS resource indicator, TPMI/SRI, field and a second SRS resource set is associated with a second TCI state and a second TPMI/SRI field.
  • a method in a wireless device, WD, configured to communicate with a network node includes receiving, from the network node, a downlink control information, DCI, message that carries two fields each of which includes a rank indicator for one of two SRS resource sets configured for the WD.
  • the method also includes determining a rank for each of the two SRS resource sets of the WD based at least in part on the rank indicator.
  • the two fields are sounding reference signal resource indicator, SRI, fields for non-codebook operation.
  • the two fields are transmit precoder matrix indicator, TPMI, fields for codebook operation.
  • determining a rank for each of the two SRS resource sets of the WD is further based at least in part on a maximum supported rank per SRS resource set of the WD.
  • the method includes receiving a single parameter indicating the maximum supported rank per SRS resource set of the WD, wherein the single parameter applies to both of the two SRS resource sets.
  • the single parameter indicates a maximum rank per SRS resource set for SFN STxMP operation.
  • each SRS resource set is associated with a corresponding panel of the WD being capable of STxMP operation.
  • a network node configured to communicate with a wireless device, WD. The network node is configured to: configure a downlink control information, DCI, message that includes two fields, each field including a rank indicator for one of two sounding reference signal, SRS, resource sets configured for the WD; and transmit the DCI message to the WD.
  • DCI downlink control information
  • SRS sounding reference signal
  • the two fields are sounding reference signal resource indicator, SRI, fields for non-codebook operation.
  • the two fields are transmit precoder matrix indicator, TPMI, fields for codebook operation.
  • the network node is configured to: configure the WD with a maximum supported rank per SRS resource set of the WD (22), via a single parameter indicating the maximum supported rank applying to both of the two SRS resource sets.
  • the single parameter indicates maximum rank per SRS resource set for SFN STxMP operation or SDM STxMP operation
  • a method in a network node configured to communicate with a wireless device, WD includes: configuring a downlink control information, DCI, message that includes two fields, each field including a rank indicator for one of two sounding reference signal, SRS, resource sets configured for the WD; and transmitting the DCI message to the WD.
  • DCI downlink control information
  • the two fields are sounding reference signal resource indicator, SRI, fields for non-codebook operation.
  • the method includes the two fields are transmit precoder matrix indicator, TPMI, fields for codebook operation.
  • the method includes configuring the WD with a maximum supported rank per SRS resource set of the WD (22), via a single parameter indicating the maximum supported rank applying to both of the two SRS resource sets.
  • FIG. 1 illustrates a beam training phase followed by a data transmission phase
  • FIG. 2 illustrates an SRS resource allocation
  • FIG. 3 illustrates transmission of PUSCH toward different TRPs
  • FIG. 4 illustrates an example of PUSCH repetitions
  • FIG. 5 illustrates PUSCH repetitions for a cyclic mapping pattern
  • FIG. 6 illustrates PUSCH repetitions for a sequential mapping pattern
  • FIG. 7 is a schematic diagram of an example network architecture illustrating a communication system connected via an intermediate network to a host computer according to the principles in the present disclosure
  • FIG. 8 is a block diagram of a host computer communicating via a network node with a wireless device over an at least partially wireless connection according to some embodiments of the present disclosure
  • FIG. 9 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for executing a client application at a wireless device according to some embodiments of the present disclosure
  • FIG. 10 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for receiving user data at a wireless device according to some embodiments of the present disclosure
  • FIG. 11 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for receiving user data from the wireless device at a host computer according to some embodiments of the present disclosure
  • FIG. 12 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for receiving user data at a host computer according to some embodiments of the present disclosure
  • FIG. 13 is a flowchart of an example process in a network node for rank restriction for multi-panel uplink (UL) transmission;
  • FIG. 14 is a flowchart of an example process in a wireless device for rank restriction for multi-panel uplink (UL) transmission;
  • FIG. 15 is a flowchart of an example process in a network node for rank restriction for multi-panel uplink (UL) transmission.
  • FIG. 16 is a flowchart of an example process in a wireless device for rank restriction for multi-panel uplink (UL) transmission.
  • relational terms such as “first” and “second,” “top” and “bottom,” and the like, may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements.
  • the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the concepts described herein.
  • the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the joining term, “in communication with” and the like may be used to indicate electrical or data communication, which may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • electrical or data communication may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • the term “coupled,” “connected,” and the like may be used herein to indicate a connection, although not necessarily directly, and may include wired and/or wireless connections.
  • network node can be any kind of network node comprised in a radio network which may further comprise any of base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), g Node B (gNB), evolved Node B (eNB or eNodeB), Node B, multistandard radio (MSR) radio node such as MSR BS, multi-cell/multicast coordination entity (MCE), integrated access and backhaul (IAB) node, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), a core network node (e.g., mobile management entity (MME), self-organizing network (SON) node, a coordinating node, positioning node, MDT node, etc.), an external node (e.g., 3rd party node, a node external to the current network), nodes in distributed antenna system (DA).
  • BS base station
  • wireless device or a user equipment (UE) are used interchangeably.
  • the WD herein can be any type of wireless device capable of communicating with a network node or another WD over radio signals, such as wireless device (WD).
  • the WD may also be a radio communication device, target device, device to device (D2D) WD, machine type WD or WD capable of machine to machine communication (M2M), low-cost and/or low-complexity WD, a sensor equipped with WD, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premises Equipment (CPE), an Internet of Things (loT) device, or a Narrowband loT (NB-IOT) device, etc.
  • D2D device to device
  • M2M machine to machine communication
  • M2M machine to machine communication
  • Tablet mobile terminals
  • smart phone laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles
  • CPE Customer Premises Equipment
  • LME Customer Premises Equipment
  • NB-IOT Narrowband loT
  • radio network node can be any kind of a radio network node which may comprise any of base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, Multi-cell/multicast Coordination Entity (MCE), IAB node, relay node, access point, radio access point, Remote Radio Unit (RRU) Remote Radio Head (RRH).
  • RNC evolved Node B
  • MCE Multi-cell/multicast Coordination Entity
  • IAB node IAB node
  • relay node relay node
  • access point radio access point
  • RRU Remote Radio Unit
  • RRH Remote Radio Head
  • WCDMA Wide Band Code Division Multiple Access
  • WiMax Worldwide Interoperability for Microwave Access
  • UMB Ultra Mobile Broadband
  • GSM Global System for Mobile Communications
  • functions described herein as being performed by a wireless device or a network node may be distributed over a plurality of wireless devices and/or network nodes.
  • the functions of the network node and wireless device described herein are not limited to performance by a single physical device and, in fact, can be distributed among several physical devices.
  • Some embodiments provide rank restriction for multi-panel uplink (UL) transmission.
  • FIG. 7 a schematic diagram of a communication system 10, according to an embodiment, such as a 3 GPP -type cellular network that may support standards such as LTE and/or NR (5G), which comprises an access network 12, such as a radio access network, and a core network 14.
  • the access network 12 comprises a plurality of network nodes 16a, 16b, 16c (referred to collectively as network nodes 16), such as NBs, eNBs, gNBs or other types of wireless access points, each defining a corresponding coverage area 18a, 18b, 18c (referred to collectively as coverage areas 18).
  • Each network node 16a, 16b, 16c is connectable to the core network 14 over a wired or wireless connection 20.
  • a first wireless device (WD) 22a located in coverage area 18a is configured to wirelessly connect to, or be paged by, the corresponding network node 16a.
  • a second WD 22b in coverage area 18b is wirelessly connectable to the corresponding network node 16b. While a plurality of WDs 22a, 22b (collectively referred to as wireless devices 22) are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole WD is in the coverage area or where a sole WD is connecting to the corresponding network node 16. Note that although only two WDs 22 and three network nodes 16 are shown for convenience, the communication system may include many more WDs 22 and network nodes 16.
  • a WD 22 may be in simultaneous communication and/or configured to separately communicate with more than one network node 16 and more than one type of network node 16.
  • a WD 22 may have dual connectivity with a network node 16 that supports LTE and the same or a different network node 16 that supports NR.
  • WD 22 may be in communication with an eNB for LTE/E-UTRAN and a gNB for NR/NG-RAN.
  • the communication system 10 may itself be connected to a host computer 24, which may be embodied in the hardware and/or software of a standalone server, a cloud- implemented server, a distributed server or as processing resources in a server farm.
  • the host computer 24 may be under the ownership or control of a service provider, or may be operated by the service provider or on behalf of the service provider.
  • the connections 26, 28 between the communication system 10 and the host computer 24 may extend directly from the core network 14 to the host computer 24 or may extend via an optional intermediate network 30.
  • the intermediate network 30 may be one of, or a combination of more than one of, a public, private or hosted network.
  • the intermediate network 30, if any, may be a backbone network or the Internet. In some embodiments, the intermediate network 30 may comprise two or more sub-networks (not shown).
  • the communication system of FIG. 7 as a whole enables connectivity between one of the connected WDs 22a, 22b and the host computer 24.
  • the connectivity may be described as an over-the-top (OTT) connection.
  • the host computer 24 and the connected WDs 22a, 22b are configured to communicate data and/or signaling via the OTT connection, using the access network 12, the core network 14, any intermediate network 30 and possible further infrastructure (not shown) as intermediaries.
  • the OTT connection may be transparent in the sense that at least some of the participating communication devices through which the OTT connection passes are unaware of routing of uplink and downlink communications.
  • a network node 16 may not or need not be informed about the past routing of an incoming downlink communication with data originating from a host computer 24 to be forwarded (e g., handed over) to a connected WD 22a. Similarly, the network node 16 need not be aware of the future routing of an outgoing uplink communication originating from the WD 22a towards the host computer 24.
  • a network node 16 is configured to include an STxMP unit 32 which may be configured to configure the WD for simultaneous multi-panel transmission, STxMP, according to the maximum rank.
  • the STxMP unit 32 may be configured to configure a downlink control information, DCI, message with a sounding reference signal, SRS, resource indicator, SRI, field that includes a rank indicator from which the WD 22 determines a rank for each of multiple antenna panels of the WD.
  • a WD 22 is configured to include a panel configuration unit 34 which may be configured to configure a number of panels for simultaneous multi-panel transmission, STxMP according to the rank parameter.
  • the panel configuration unit 34 may be configured to determine a rank for each of multiple antenna panels of the WD based at least in part on the rank indicator.
  • a host computer 24 comprises hardware (HW) 38 including a communication interface 40 configured to set up and maintain a wired or wireless connection with an interface of a different communication device of the communication system 10.
  • the host computer 24 further comprises processing circuitry 42, which may have storage and/or processing capabilities.
  • the processing circuitry 42 may include a processor 44 and memory 46.
  • the processing circuitry 42 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • processors and/or processor cores and/or FPGAs Field Programmable Gate Array
  • ASICs Application Specific Integrated Circuitry
  • the processor 44 may be configured to access (e.g., write to and/or read from) memory 46, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 46 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • Processing circuitry 42 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by host computer 24.
  • Processor 44 corresponds to one or more processors 44 for performing host computer 24 functions described herein.
  • the host computer 24 includes memory 46 that is configured to store data, programmatic software code and/or other information described herein.
  • the software 48 and/or the host application 50 may include instructions that, when executed by the processor 44 and/or processing circuitry 42, causes the processor 44 and/or processing circuitry 42 to perform the processes described herein with respect to host computer 24.
  • the instructions may be software associated with the host computer 24.
  • the software 48 may be executable by the processing circuitry 42.
  • the software 48 includes a host application 50.
  • the host application 50 may be operable to provide a service to a remote user, such as a WD 22 connecting via an OTT connection 52 terminating at the WD 22 and the host computer 24.
  • the host application 50 may provide user data which is transmitted using the OTT connection 52.
  • the “user data” may be data and information described herein as implementing the described functionality.
  • the host computer 24 may be configured for providing control and functionality to a service provider and may be operated by the service provider or on behalf of the service provider.
  • the processing circuitry 42 of the host computer 24 may enable the host computer 24 to observe, monitor, control, transmit to and/or receive from the network node 16 and or the wireless device 22.
  • the communication system 10 further includes a network node 16 provided in a communication system 10 and including hardware 58 enabling it to communicate with the host computer 24 and with the WD 22.
  • the hardware 58 may include a communication interface 60 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of the communication system 10, as well as a radio interface 62 for setting up and maintaining at least a wireless connection 64 with a WD 22 located in a coverage area 18 served by the network node 16.
  • the radio interface 62 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the communication interface 60 may be configured to facilitate a connection 66 to the host computer 24.
  • the connection 66 may be direct or it may pass through a core network 14 of the communication system 10 and/or through one or more intermediate networks 30 outside the communication system 10.
  • the hardware 58 of the network node 16 further includes processing circuitry 68.
  • the processing circuitry 68 may include a processor 70 and a memory 72.
  • the processing circuitry 68 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • FPGAs Field Programmable Gate Array
  • ASICs Application Specific Integrated Circuitry
  • the processor 70 may be configured to access (e.g., write to and/or read from) the memory 72, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • volatile and/or nonvolatile memory e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the network node 16 further has software 74 stored internally in, for example, memory 72, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the network node 16 via an external connection.
  • the software 74 may be executable by the processing circuitry 68.
  • the processing circuitry 68 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e g., by network node 16.
  • Processor 70 corresponds to one or more processors 70 for performing network node 16 functions described herein.
  • the memory 72 is configured to store data, programmatic software code and/or other information described herein.
  • the software 74 may include instructions that, when executed by the processor 70 and/or processing circuitry 68, causes the processor 70 and/or processing circuitry 68 to perform the processes described herein with respect to network node 16.
  • processing circuitry 68 of the network node 16 may include an STxMP unit 32 which is configured to configure the WD for simultaneous multi-panel transmission, STxMP, according to the maximum rank.
  • the communication system 10 further includes the WD 22 already referred to.
  • the WD 22 may have hardware 80 that may include a radio interface 82 configured to set up and maintain a wireless connection 64 with a network node 16 serving a coverage area 18 in which the WD 22 is currently located.
  • the radio interface 82 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the hardware 80 of the WD 22 further includes processing circuitry 84.
  • the processing circuitry 84 may include a processor 86 and memory 88.
  • the processing circuitry 84 may comprise integrated circuitry for processing and/or control, e g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • the processor 86 may be configured to access (e.g., write to and/or read from) memory 88, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 88 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the WD 22 may further comprise software 90, which is stored in, for example, memory 88 at the WD 22, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the WD 22.
  • the software 90 may be executable by the processing circuitry 84.
  • the software 90 may include a client application 92.
  • the client application 92 may be operable to provide a service to a human or non-human user via the WD 22, with the support of the host computer 24.
  • an executing host application 50 may communicate with the executing client application 92 via the OTT connection 52 terminating at the WD 22 and the host computer 24.
  • the client application 92 may receive request data from the host application 50 and provide user data in response to the request data.
  • the OTT connection 52 may transfer both the request data and the user data.
  • the client application 92 may interact with the user to generate the user data that it provides.
  • the processing circuitry 84 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by WD 22.
  • the processor 86 corresponds to one or more processors 86 for performing WD 22 functions described herein.
  • the WD 22 includes memory 88 that is configured to store data, programmatic software code and/or other information described herein.
  • the software 90 and/or the client application 92 may include instructions that, when executed by the processor 86 and/or processing circuitry 84, causes the processor 86 and/or processing circuitry 84 to perform the processes described herein with respect to WD 22.
  • the processing circuitry 84 of the wireless device 22 may include a panel configuration unit 34 which is configured to configure a number of panels for simultaneous multi-panel transmission, STxMP according to the rank parameter.
  • the inner workings of the network node 16, WD 22, and host computer 24 may be as shown in FIG. 8 and independently, the surrounding network topology may be that of FIG. 7.
  • the OTT connection 52 has been drawn abstractly to illustrate the communication between the host computer 24 and the wireless device 22 via the network node 16, without explicit reference to any intermediary devices and the precise routing of messages via these devices.
  • Network infrastructure may determine the routing, which it may be configured to hide from the WD 22 or from the service provider operating the host computer 24, or both. While the OTT connection 52 is active, the network infrastructure may further take decisions by which it dynamically changes the routing (e.g., on the basis of load balancing consideration or reconfiguration of the network).
  • the wireless connection 64 between the WD 22 and the network node 16 is in accordance with the teachings of the embodiments described throughout this disclosure.
  • One or more of the various embodiments improve the performance of OTT services provided to the WD 22 using the OTT connection 52, in which the wireless connection 64 may form the last segment. More precisely, the teachings of some of these embodiments may improve the data rate, latency, and/or power consumption and thereby provide benefits such as reduced user waiting time, relaxed restriction on file size, better responsiveness, extended battery lifetime, etc.
  • a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve.
  • the measurement procedure and/or the network functionality for reconfiguring the OTT connection 52 may be implemented in the software 48 of the host computer 24 or in the software 90 of the WD 22, or both.
  • sensors (not shown) may be deployed in or in association with communication devices through which the OTT connection 52 passes; the sensors may participate in the measurement procedure by supplying values of the monitored quantities exemplified above, or supplying values of other physical quantities from which software 48, 90 may compute or estimate the monitored quantities.
  • the reconfiguring of the OTT connection 52 may include message format, retransmission settings, preferred routing etc.; the reconfiguring need not affect the network node 16, and it may be unknown or imperceptible to the network node 16. Some such procedures and functionalities may be known and practiced in the art.
  • measurements may involve proprietary WD signaling facilitating the host computer’s 24 measurements of throughput, propagation times, latency and the like.
  • the measurements may be implemented in that the software 48, 90 causes messages to be transmitted, in particular empty or ‘dummy’ messages, using the OTT connection 52 while it monitors propagation times, errors, etc.
  • the host computer 24 includes processing circuitry 42 configured to provide user data and a communication interface 40 that is configured to forward the user data to a cellular network for transmission to the WD 22.
  • the cellular network also includes the network node 16 with a radio interface 62.
  • the network node 16 is configured to, and/or the network node’s 16 processing circuitry 68 is configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/ supporting/ending a transmission to the WD 22, and/or preparing/terminating/ maintaining/supporting/ending in receipt of a transmission from the WD 22.
  • the host computer 24 includes processing circuitry 42 and a communication interface 40 that is configured to a communication interface 40 configured to receive user data originating from a transmission from a WD 22 to a network node 16.
  • the WD 22 is configured to, and/or comprises a radio interface 82 and/or processing circuitry 84 configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/ supporting/ending a transmission to the network node 16, and/or preparing/ terminating/maintaining/supporting/ending in receipt of a transmission from the network node 16.
  • FIGS. 7 and 8 show various “units” such as STxMP unit 32, and panel configuration unit 34 as being within a respective processor, it is contemplated that these units may be implemented such that a portion of the unit is stored in a corresponding memory within the processing circuitry. In other words, the units may be implemented in hardware or in a combination of hardware and software within the processing circuitry.
  • FIG. 9 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIGS. 7 and 8, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIG. 8.
  • the host computer 24 provides user data (Block SI 00).
  • the host computer 24 provides the user data by executing a host application, such as, for example, the host application 50 (Block SI 02).
  • the host computer 24 initiates a transmission carrying the user data to the WD 22 (Block S104).
  • the network node 16 transmits to the WD 22 the user data which was carried in the transmission that the host computer 24 initiated, in accordance with the teachings of the embodiments described throughout this disclosure (Block S106).
  • the WD 22 executes a client application, such as, for example, the client application 92, associated with the host application 50 executed by the host computer 24 (Block SI 08).
  • FIG. 10 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG. 7, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS. 7 and 8.
  • the host computer 24 provides user data (Block SI 10).
  • the host computer 24 provides the user data by executing a host application, such as, for example, the host application 50.
  • the host computer 24 initiates a transmission carrying the user data to the WD 22 (Block SI 12).
  • the transmission may pass via the network node 16, in accordance with the teachings of the embodiments described throughout this disclosure.
  • the WD 22 receives the user data carried in the transmission (Block SI 14).
  • FIG. 11 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG. 7, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS. 7 and 8.
  • the WD 22 receives input data provided by the host computer 24 (Block SI 16).
  • the WD 22 executes the client application 92, which provides the user data in reaction to the received input data provided by the host computer 24 (Block SI 18).
  • the WD 22 provides user data (Block S120).
  • the WD provides the user data by executing a client application, such as, for example, client application 92 (Block S122).
  • client application 92 may further consider user input received from the user.
  • the WD 22 may initiate, in an optional third substep, transmission of the user data to the host computer 24 (Block SI 24).
  • the host computer 24 receives the user data transmitted from the WD 22, in accordance with the teachings of the embodiments described throughout this disclosure (Block S126).
  • FIG. 12 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG. 7, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS. 7 and 8.
  • the network node 16 receives user data from the WD 22 (Block S128).
  • the network node 16 initiates transmission of the received user data to the host computer 24 (Block S 130).
  • the host computer 24 receives the user data carried in the transmission initiated by the network node 16 (Block S132).
  • FIG. 13 is a flowchart of an example process in a network node 16 for rank restriction for multi-panel uplink (UL) transmission.
  • One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more of processing circuitry 68 (including the configuration unit 32), processor 70, radio interface 62 and/or communication interface 60.
  • Network node 16 such as via processing circuitry 68 and/or processor 70 and/or radio interface 62 and/or communication interface 60 may be configured to configure the WD 22 with a maximum rank parameter indicating a set of candidate ranks for space division multiplex, SDM, transmission (Block S134).
  • the process also includes configuring the WD 22 for simultaneous multi-panel transmission, STxMP, according to the maximum rank parameter (Block SI 36).
  • the method also includes configuring the WD 22 with a first maximum rank parameter for STxMP SDM associated with a first sounding reference signal, SRS, resource set and with a second maximum rank parameter for STxMP SDM associated with a second SRS resource set.
  • the first maximum rank parameter indicates a first number of panels for physical uplink shared channel, PUSCH, transmission and the second maximum rank parameter indicates a second number of panels for PUSCH transmission.
  • the method also includes configuring the WD 22 with a minimum rank parameter indicating a minimum number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • the process also includes configuring the WD 22 with an exact rank parameter indicating a number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • FIG. 14 is a flowchart of an example process in a wireless device 22 according to some embodiments of the present disclosure.
  • One or more blocks described herein may be performed by one or more elements of wireless device 22 such as by one or more of processing circuitry 84 (including the rank determination unit 34), processor 86, radio interface 82 and/or communication interface 60.
  • Wireless device 22 such as via processing circuitry 84 and/or processor 86 and/or radio interface 82 may be configured to receive a rank parameter indicating a set of candidate ranks for space division multiplex, SDM, transmission (Block S138).
  • the process also includes configuring a number of panels for simultaneous multi-panel transmission, STxMP according to the rank parameter (Block SI 40).
  • the process also includes: receiving a first maximum rank parameter for STxMP SDM associated with a first sounding reference signal, SRS, resource set and a second maximum rank parameter for STxMP SDM associated with a second SRS resource set; and configuring a first a first number of panels for physical uplink shared channel, PUSCH, transmission according to the first maximum rank parameter and configure a second number of panels for PUSCH transmission according to the second maximum rank parameter.
  • the rank parameter is a minimum rank parameter indicating a minimum number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • the rank parameter is an exact rank parameter indicating a number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • a number of panels to be used for physical uplink shared channel, PUSCH, transmission is derived from the rank parameter based on a number of transmission/reception points, TRPs.
  • FIG. 15 is a flowchart of an example process in a network node 16 for rank restriction for multi-panel uplink (UL) transmission.
  • One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more of processing circuitry 68 (including the configuration unit 32), processor 70, radio interface 62 and/or communication interface 60.
  • Network node 16 such as via processing circuitry 68 and/or processor 70 and/or radio interface 62 and/or communication interface 60 may be configured to configuring a downlink control information, DCI, message that includes two fields, each field including a rank indicator for one of two sounding reference signal, SRS, resource sets configured for the WD (Block S142).
  • the process includes transmitting the DCI message to the WD (Block S144).
  • the two fields are sounding reference signal resource indicator, SRI, fields for non-codebook operation.
  • the method includes the two fields are transmit precoder matrix indicator, TPMI, fields for codebook operation.
  • the method includes configuring the WD with a maximum supported rank per SRS resource set of the WD (22), via a single parameter indicating the maximum supported rank applying to both of the two SRS resource sets.
  • FIG. 16 is a flowchart of an example process in a wireless device 22 according to some embodiments of the present disclosure.
  • One or more blocks described herein may be performed by one or more elements of wireless device 22 such as by one or more of processing circuitry 84 (including the rank determination unit 34), processor 86, radio interface 82 and/or communication interface 60.
  • Wireless device 22 such as via processing circuitry 84 and/or processor 86 and/or radio interface 82 may be configured to receive, from the network node 16, a downlink control information, DCI, message that carries two fields each of which includes a rank indicator for one of two SRS resource sets configured for the WD 22 (Block S146).
  • the method also includes determining a rank for each of the two SRS resource sets of the WD 22 based at least in part on the rank indicator (Block SI 48).
  • the two fields are sounding reference signal resource indicator, SRI, fields for non-codebook operation. In some embodiments, the two fields are transmit precoder matrix indicator, TPMI, fields for codebook operation. In some embodiments, determining a rank for each of the two SRS resource sets of the WD 22 is further based at least in part on a maximum supported rank per SRS resource set of the WD 22. In some embodiments, the method includes receiving a single parameter indicating the maximum supported rank per SRS resource set of the WD 22, wherein the single parameter applies to both of the two SRS resource sets. In some embodiments, the single parameter indicates a maximum rank per SRS resource set for SFN STxMP operation. In some embodiments, each SRS resource set is associated with a corresponding panel of the WD which is capable of STxMP operation.
  • a first and second “SRS Resource Indicator” field in DCI are utilized, where the number of indicated SRS resources in the second field may be different from the first field
  • a first “SRS Resource Indicator” field + a second “SRS Resource Indicator” field may be used to indicate rank and precoders, where the second “SRS Resource Indicator” field may only indicate the selected precoder, but not the rank (rank for the second “SRS Resource Indicator” field may be the same as the rank indicated by the first “SRS Resource Indicator” field).
  • the rank might be different for the two WD 22 panels.
  • a new second “SRS Resource Indicator” field may be introduce that may indicate both precoder and rank, where the rank may be the same or different from the rank indicated by the first “SRS Resource Indicator” field.
  • the length of the first and second first “SRS Resource Indicator” field during STxMP operation may be limited by one or more parameters used to set the maximum supported rank per WD panel (or SRS resource set), as described herein.
  • a “Precoding Information and Number of Layers” field + a “Second Precoding Information” field may be used to indicate rank and precoders, where the “Second Precoding Information” field only may indicate the selected precoder, but not the rank (the rank for the “Second Precoding Information” field may be the same as the rank indicated by the “Precoding Information and Number of Layers” field).
  • a second “Precoding Information and Number of Layers” field may be introduced that may indicate both precoder and rank, where the rank may be the same or different from the rank indicated by the first “Precoding Information and Number of Layers”.
  • the length of the first and second “Precoding Information and Number of Layers” field during STxMP operation may be limited by one or more parameters used to set the maximum supported rank per WD panel (or SRS resource set), as described herein.
  • the second “Precoding Information and Number of Layers” fields for the STxMP use case may be smaller than legacy “Precoding Information and Number of Layers” field as the max rank will be limited to 2 in NR for STxMP per WD panel.
  • a WD 22 configured for STxMP is configured with two SRS resource sets, and two TPMI/SRI fields, where a first SRS resource set is associated with a first indicated TCI state and a first TPMI/SRI field, and a second SRS resource set is associated with a second indicated TCI state and a second TPMI/SRI field.
  • the principles disclosed herein may apply when the WD 22 is configured with more than two SRS resource sets and/or more than two TPMI/SRI fields.
  • the maxRank parameter in PUSCH-configure may be reinterpreted when the WD 22 is configured for STxMP operation. This may be done, for example, explicitly with a RRC configured parameter that indicates STxMP operation for the WD 22, or it may be done implicitly, for example in case the WD 22 indicates support for STxMP and the WD 22 has been indicated with two TCI states.
  • wo SRS resource sets are configured with usage ‘codebook’ and/or ‘nonCodebook’, then the WD 22 assumes STxMP operation.
  • the parameter maxRank (in PUSCH-config) may be reinterpreted as the total maximum rank across both SRS resource sets with usage ‘codebook’, when the WD 22 is configured for STxMP operation and indicated with SDM STxMP transmission. So, for example, if the maxRank is set to 3, then the following candidate STxMP ranks for SDM transmission are possible: (1,1), (1,2) and (2,1), but not (2,2), since that has a maximum total rank of 4.
  • the maximum rank for SFN STxMP transmission and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes may be the same as the maximum rank for SDM STxMP, i.e., the same as indicated by maxRank.
  • the maximum rank of SFN STxMP transmission and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes may be determined by dividing the value of maxRank with two (either rounded up or rounded down). So, for example, if maxRank is set to 3, the maximum rank for STxMP SFN may be divided by two and rounded down, and hence becomes 1.
  • the WD 22 may assume that the TPMI/SRI field associated with the first SRS resource set supports maximum rank 1 (and hence use the corresponding “codepoint to rank and precoder” -mapping of that TPMI/SRI field), and the WD 22 may assume that the TPMI/SRI field associated with the second SRS resource set supports maximum rank 1 (and hence use the corresponding “codepoint to rank and precoder” -mapping of that TPMI/SRI field).
  • the parameter maxRank may be re-used to also apply for STxMP SDM, such that the maxRank is indicating the maximum rank per SRS resource set. So, for example, if the maxRank is set to 2, then the maximum rank per SRS resource set may be equal to two for STxMP SDM, which gives the following possible STxMP SDM ranks: (1,1), (1,2) and (2,1), (2,2). If the maxRank is set to 1, then the maximum rank per SRS resource set for STxMP SDM may be equal to one, which gives the following possible STxMP ranks: (1,1).
  • the maxRank may be re-used for STxMP SFN and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes, such that if maxRank is set to 2, then the maximum rank for STxMP SFN and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes is 2.
  • new parameters are introduced that determine the maximum rank for STxMP operation.
  • maxRankl is used to indicate the maximum supported rank for STxMP SDM associated with a first SRS resource set
  • maxRank2 is used to indicate the maximum supported rank for STxMP SDM associated with a second SRS resource set. This is illustrated as follows:
  • PUSCH-Config :: SEQUENCE ⁇ maxRank INTEGER (1..4) maxRankl INTEGER (1,2) maxRank2 INTEGER (1,2)
  • the maximum rank for STxMP SFN and/or 3 GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes may be derived from the legacy parameter “maxRank”. In some embodiments, the maximum rank for STxMP SFN and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3 GPP Rel-15/16 single TRP schemes may be derived from one of the two new parameters maxRankl or maxRank2. For example, the maximum rank may be determined from only maxRankl, or the maximum rank may be determined based on the highest indicated maximum rank from either maxRankl or maxRank2, or the maximum rank may be determined based on the lowest indicated maximum rank from either maxRankl or maxRank2).
  • one new parameter is introduced, instead of two, that determines the maximum rank for STxMP transmission.
  • the parameter maxRank-STxMP may be used to indicate the maximum rank per SRS resource set for SDM STxMP, or the total maximum rank for SDM STxMP across both SRS resource sets. This is illustrated in the following example:
  • PUSCH-Config :: SEQUENCE ) maxRank INTEGER (1 .4) maxRank- STxMP INTEGER (1,2) or (1..4)
  • the parameter may also be used to indicate the maximum rank for STxMP SFN
  • additional parameters are introduced that determine the maximum rank for a WD 22 configured for STxMP operation, both for actual STxMP transmission and when dynamically switched to sTRP (e.g., single WD panel) transmission. This is illustrated in the following example:
  • PUSCH-Config :: SEQUENCE ⁇ maxRank INTEGER (1 4) maxRankl -STxMP INTEGER (1,N) maxRank2-STxMP INTEGER (1,N) maxRankl -sTRP INTEGER (1,N) maxRank2-sTRP INTEGER (1,N)
  • the maximum rank for STxMP transmission is one layer per SRS resource set, while for single panel transmission, the maximum rank should be two.
  • the parameter “maxRankl -STxMP” may be used to indicate the maximum supported rank for PUSCH associated with a first SRS resource set during STxMP space division multiplexing (SDM)
  • the parameter “maxRank2-STxMP” may be used to indicate the maximum supported rank for PUSCH associated with a second SRS resource set during STxMP SDM.
  • the parameter “maxRankl -sTRP” may be used to indicate the maximum supported rank for PUSCH associated with a first SRS resource set during single WD panel transmission
  • the parameter “maxRank2- sTRP” may be used to indicate the maximum supported rank for PUSCH associated with a second SRS resource set during single WD panel transmission.
  • the maximum rank supported for STxMP SFN may be determined for example based on one of these four parameters, or be separately configured in another parameter (for example an additional parameter “maxRank- STxMP- SFN” included in PUSCH config).
  • the network node 16 might always want to schedule the WD 22 with a PUSCH rank larger than X.
  • rank 2 is always used for PUSCH.
  • the TPMI/SRI overhead in DCI may be reduced.
  • a minimum rank and or the exact ranks that may be used for a WD 22 during STxMP (and/or single WD panel transmission) is introduced.
  • PUSCH-Config :: SEQUENCE ⁇ maxRank INTEGER (1 .4) supportedRankl BIT STRING (SIZE (N)) supportedRank2 BIT STRING (SIZE (N))
  • a bitmap is used to indicate the available ranks for a WDs PUSCH transmission.
  • two parameters are introduced “supportedRankl” and “supportedRank2”, where “supportedRankl” may be used to indicate the supported rank for a first SRS resource set and “supportedRank2” may be used to indicate the supported ranks for a second SRS resource set (not that more than two ranks may be indicated in case the WD 22 supports STxMP from more than two WD panels).
  • the bit string of “supportedRankl” indicates [1,1]
  • both rank 1 and rank 2 may be supported for the first SRS resource set
  • “supportedRank2” indicates [0,1] only rank 2 may be supported for the second SRS resource set.
  • a single parameter (e.g., “supportedRank”) may be used instead of two parameters, where the single parameter indicates the available PUSCH ranks for both SRS resource sets (i.e., if the parameter “supportedRank” is set to [1,1], then rank 1 and rank 2 may be supported for both a first and a second SRS resource set).
  • the “maxMIMO-Layers” parameter in PUSCH- ServingCellConfigure may be re-interpreted when the WD 22 is configured for STxMP (which, for example, may be done explicitly with a RRC configured parameter that indicates STxMP operation for the WD 22 (e.g., for a serving cell), or it may be done implicitly, for example in case the WD 22 indicates support for STxMP and the WD 22 has been indicated with two TCI states and two SRS resource sets with usage ‘codebook’ and/or ‘nonCodebook’).
  • the “maxMIMO-Layers” may be re-interpreted as the total maximum rank across both SRS resource sets with usage ‘nonCodebook’ when the WD 22 is configured for STxMP and indicated with SDM UL transmission. So, for example, if the “maxMIMO-Layers” is set to 3, then the following candidate STxMP ranks for SDM transmission are possible: (1,1), (1,2) and (2,1), but not (2,2), since that has a maximum total rank of 4.
  • the maximum rank for SFN STxMP transmission and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3 GPP Rel-15/16 single TRP schemes may be the same as the maximum rank for SDM STxMP.
  • the maximum rank of SFN STxMP transmission and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes may be determined by dividing the value of “maxMIMO-Layers” with two (either rounded up or rounded down).
  • the “maxMIMO-Layers” may be re-used for STxMP SDM, such that the “maxMIMO-Layers” indicates the maximum rank per SRS resource set. So, for example, if the “maxMIMO-Layers” is set to 2, then the maximum rank per SRS resource set may be equal to two for STxMP SDM, which gives the following possible STxMP SDM ranks: (1,1), (1,2) and (2,1), (2,2), and if the “maxMIMO-Layers” is set to 1, then the maximum rank per SRS resource set for STxMP SDM may be equal to one, which gives the following possible STxMP ranks: (1,1).
  • the “maxMIMO-Layers” may be re-used for STxMP SFN and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3 GPP Rel-15/16 single TRP schemes, such that if “maxMIMO-Layers” is set to 2, then the maximum rank for STxMP SFN and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes is 2.
  • parameters are introduced that determine the maximum rank for STxMP transmission. For example:
  • maxMIMO-Layers 1 and maxMIMO-Lay ers2 may be introduced in PUSCH-config, where maxMIMO-Layers 1 may be used to indicate the maximum supported rank for STxMP SDM associated with a first SRS resource set, and maxMIMO- Layers2 may be used to indicate the maximum supported rank for STxMP SDM associated with a second SRS resource set.
  • the maximum rank for STxMP SFN and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel- 15/16 single TRP schemes may be derived from the legacy parameter “maxMIMO- Layers”.
  • the maximum rank for STxMP SFN and/or 3GPP Rel-17 PUSCH TDM repetition schemes and/or 3GPP Rel-15/16 single TRP schemes may be derived from one of the two new parameters maxMIMO-Layers 1 or maxMIMO-Lay ers2.
  • the maximum rank may be determined from only maxMIMO-Layers 1, or the max rank may be determined based on the highest indicated max rank from maxMIMO-Layers 1 and maxMIMO-Layers2, or the max rank may be determined based on the lowest indicated max rank from maxMIMO-Layers 1 and maxMIMO-Lay ers2.
  • one new parameter is introduced, instead of two, that determines the maximum rank for STxMP transmission, as schematically illustrated in the following example:
  • PUSCH-ServingCellConfig :: SEQUENCE ⁇ ... [[ maxMIMO-Layers INTEGER (1 .4) maxMIMO-Layers-STxMP INTEGER (1,2) or (1..4)
  • the parameter maxMIMO-Layers -STxMP may be used to indicate the maximum rank per SRS resource set for SDM STxMP, or the total maximum rank for SDM STxMP across both SRS resource sets.
  • the parameter may also be used to indicate the maximum rank for STxMP SFN.
  • Some parameters determine the maximum rank for a WD 22 configured for STxMP operation, both for actual STxMP transmission and when dynamically switched to sTRP (e g., single WD panel) transmission. This may be useful for example, if the maximum rank for STxMP transmission is one layer per SRS resource set, while for single panel transmission, the maximum rank should be two.
  • the parameter “maxMIMO-Layersl-STxMP” may be used to indicate the maximum supported rank for PUSCH associated with a first SRS resource set during STxMP SDM
  • the parameter “maxMIM0-Layers2-STxMP” may be used to indicate the maximum supported rank for PUSCH associated with a second SRS resource set during STxMP SDM.
  • the parameter “maxMIMO-Layersl-sTRP” may be used to indicate the maximum supported rank for PUSCH associated with a first SRS resource set during single WD panel transmission
  • the parameter “maxMIMO-Layers2-sTRP” may be used to indicate the maximum supported rank for PUSCH associated with a second SRS resource set during single WD panel transmission.
  • the maximum rank supported for STxMP SFN may be determined for example based on one of these four parameters, or be separately configured in another parameter (for example an additional parameter “maxMIMO- Layers-STxMP-SFN” included in PUSCH config).
  • the network such as via the network node 16, might always want to schedule the WD 22 with a PUSCH rank larger than X.
  • rank 2 is always used for PUSCH.
  • the TPMI/SRI overhead in DCI may be reduced.
  • a minimum rank and or the exact ranks that may be used for a WD 22 during STxMP (and/or single WD panel transmission) is introduced.
  • a bitmap is used to indicate the available ranks for a WDs PUSCH transmission.
  • two parameters are introduced “supportedMIMO-Layers 1” and “supportedMIMO-Layers2”, where “supportedMIMO-Layers 1” may be used to indicate the supported rank for a first SRS resource set and “supportedMIMO-Layers2” may be used to indicate the supported ranks for a second SRS resource set.
  • “supportedMIMO-Layersl” indicates [1,1]
  • both rank 1 and rank 2 may be supported for the first SRS resource set
  • “supportedMIMO-Layers2” indicates [0,1] only rank 2 may be supported for the second SRS resource set.
  • a single parameter (e.g., “supportedMIMO-Layers”) may be used instead of two parameters, where the single parameter indicates the available PUSCH ranks for both SRS resource sets (i.e., if the parameter “supportedMIMO-Layers” may be set to [1,1], then rank 1 and rank 2 may be supported for both a first and a second SRS resource set).
  • the WD 22 signals in WD capability signaling that it supports to be configured with minimum rank and/or available ranks for single-panel and/or multi-panel UL data transmission.
  • a UL sounding reference signal is intended, which might be called something else in 6G.
  • the disclosure also uses the words SRI, which is used to indicate an SRS resource
  • an indication of an UL sounding reference signal is intended, which might be called something else in 6G.
  • the term TPMI is used to indicate rank and precoder for UL transmission.
  • the rank and precoder indication might be performed in another way and be called something else, but there is a limit the number of bits used for indicating rank and precoder for UL data transmission by restricting the available ranks.
  • reference is made to PUSCH. However, this might be called something else in 6G, and here UL data transmission is referenced.
  • the rank restriction parameter (maxRank and maxMIMO-Layers) might be called something else in 6G and they might be located in other RRC configure information elements than PUSCH-configure and PUSCH-ServingCellConfig Extension to URLLC/eMBB/XR applications
  • separate maximum rank restrictions for UL data transmission over multiple WD panels are configured for different types of data communications (and/or for different DCI formats).
  • this disclosure is extended such that all the embodiments described above may be configured per type of data communication (e.g., eMBB, XR, URLLC)
  • a network node configured to communicate with a wireless device (WD), the network node configured to, and/or comprising a radio interface and/or comprising processing circuitry configured to: configure the WD with a maximum rank parameter indicating a set of candidate ranks for space division multiplex, SDM, transmission; and configure the WD for simultaneous multi-panel transmission, STxMP, according to the maximum rank parameter.
  • WD wireless device
  • processing circuitry configured to: configure the WD with a maximum rank parameter indicating a set of candidate ranks for space division multiplex, SDM, transmission; and configure the WD for simultaneous multi-panel transmission, STxMP, according to the maximum rank parameter.
  • Embodiment A2 The network node of Embodiment Al, the network node, radio interface and/or processing circuitry are further configured to configure the WD with a first maximum rank parameter for STxMP SDM associated with a first sounding reference signal, SRS, resource set and with a second maximum rank parameter for STxMP SDM associated with a second SRS resource set.
  • Embodiment A3 The network node of any of Embodiments Al and A2, wherein the first maximum rank parameter indicates a first number of panels for physical uplink shared channel, PUSCH, transmission and the second maximum rank parameter indicates a second number of panels for PUSCH transmission.
  • Embodiment A4 The network node of any of Embodiments A1-A3, wherein the network node, radio interface and/or processing circuitry are further configured to configured the WD with a minimum rank parameter indicating a minimum number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • Embodiment A5 The network node of any of Embodiments A1-A4, wherein the network node, radio interface and/or processing circuitry are further configured to configured the WD with an exact rank parameter indicating a number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • Embodiment Bl A method implemented in a network node configured to communicate with a wireless device, WD, the method comprising: configuring the WD with a maximum rank parameter indicating a set of candidate ranks for space division multiplex, SDM, transmission; and configuring the WD for simultaneous multi-panel transmission, STxMP, according to the maximum rank parameter.
  • Embodiment B2 The method of Embodiment B 1 , further comprising configuring the WD with a first maximum rank parameter for STxMP SDM associated with a first sounding reference signal, SRS, resource set and with a second maximum rank parameter for STxMP SDM associated with a second SRS resource set.
  • Embodiment B3 The method of any of Embodiments Bl and B2, wherein the first maximum rank parameter indicates a first number of panels for physical uplink shared channel, PUSCH, transmission and the second maximum rank parameter indicates a second number of panels for PUSCH transmission.
  • Embodiment B4 The method of any of Embodiments B1-B3, further comprising configuring the WD with a minimum rank parameter indicating a minimum number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • Embodiment B5. The method of any of Embodiments B1-B4, further comprising configuring the WD with an exact rank parameter indicating a number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • a wireless device configured to communicate with a network node, the WD configured to, and/or comprising a radio interface and/or processing circuitry configured to: receive a rank parameter indicating a set of candidate ranks for space division multiplex, SDM, transmission; and configure a number of panels for simultaneous multi-panel transmission, STxMP according to the rank parameter.
  • Embodiment C2 The WD of Embodiment Cl, wherein the WD, radio interface and/or processing circuitry are further configured to: receive a first maximum rank parameter for STxMP SDM associated with a first sounding reference signal, SRS, resource set and a second maximum rank parameter for STxMP SDM associated with a second SRS resource set; and configure a first a first number of panels for physical uplink shared channel, PUSCH, transmission according to the first maximum rank parameter and configure a second number of panels for PUSCH transmission according to the second maximum rank parameter.
  • Embodiment C3 The WD of Embodiment Cl, wherein the rank parameter is a minimum rank parameter indicating a minimum number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • Embodiment C4. The WD of Embodiment Cl, wherein the rank parameter is an exact rank parameter indicating a number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • Embodiment C5. The WD of Embodiments Cl, wherein a number of panels to be used for physical uplink shared channel, PUSCH, transmission is derived from the rank parameter based at least in part on a number of transmission/reception points, TRPs.
  • Embodiment DI A method implemented in a wireless device (WD) configured to communicate with a network node, the method comprising: receiving a rank parameter indicating a set of candidate ranks for space division multiplex, SDM, transmission; and configuring a number of panels for simultaneous multi-panel transmission, STxMP according to the rank parameter.
  • WD wireless device
  • Embodiment D2 further comprising: receiving a first maximum rank parameter for STxMP SDM associated with a first sounding reference signal, SRS, resource set and a second maximum rank parameter for STxMP SDM associated with a second SRS resource set; and configuring a first a first number of panels for physical uplink shared channel, PUSCH, transmission according to the first maximum rank parameter and configure a second number of panels for PUSCH transmission according to the second maximum rank parameter.
  • Embodiment D3 The method of Embodiment D 1 , wherein the rank parameter is a minimum rank parameter indicating a minimum number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • the rank parameter is a minimum rank parameter indicating a minimum number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • Embodiment D4 The method of Embodiment D 1 , wherein the rank parameter is an exact rank parameter indicating a number of panels to be used for physical uplink shared channel, PUSCH, transmission.
  • Embodiment D5 The method of Embodiments D 1 , wherein a number of panels to be used for physical uplink shared channel, PUSCH, transmission is derived from the rank parameter based at least in part on a number of transmission/reception points, TRPs.
  • the concepts described herein may be embodied as a method, data processing system, computer program product and/or computer storage media storing an executable computer program. Accordingly, the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a “circuit” or “module.” Any process, step, action and/or functionality described herein may be performed by, and/or associated to, a corresponding module, which may be implemented in software and/or firmware and/or hardware. Furthermore, the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that may be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.
  • These computer program instructions may also be stored in a computer readable memory or storage medium that may direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • Computer program code for carrying out operations of the concepts described herein may be written in an object oriented programming language such as Python, Java® or C++.
  • the computer program code for carrying out operations of the disclosure may also be written in conventional procedural programming languages, such as the "C" programming language.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer.
  • the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.

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Abstract

Un procédé, un système et un appareil de restriction de rang pour une transmission de liaison montante (UL) à panneaux multiples sont divulgués. Selon un aspect, un procédé dans un dispositif sans fil (WD) consiste à recevoir, en provenance d'un nœud de réseau, un message d'informations de commande de liaison descendante (DCI) qui comprend deux champs, dont chacun comprend un indicateur de rang pour l'un de deux ensembles de ressources de signal de référence de sondage (SRS) configurés pour le WD. Le procédé consiste à déterminer un rang pour chacun des deux ensembles de ressources SRS du WD sur la base, au moins en partie, de l'indicateur de rang.
PCT/EP2023/078491 2022-10-13 2023-10-13 Restriction de rang pour une transmission ul à panneaux multiples WO2024079319A1 (fr)

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3GPP TS 38.331
MODERATOR (OPPO): "Summary #1 on Rel-18 STxMP", vol. RAN WG1, no. e-Meeting; 20221010 - 20221019, 12 October 2022 (2022-10-12), XP052259773, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG1_RL1/TSGR1_110b-e/Docs/R1-2210305.zip R1-2210305.docx> [retrieved on 20221012] *
QUALCOMM INCORPORATED: "Extension of Unified TCI Framework for mTRP", vol. RAN WG1, no. e meeting ;20221010 - 20221019, 30 September 2022 (2022-09-30), XP052259439, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG1_RL1/TSGR1_110b-e/Docs/R1-2209967.zip R1-2209967 Extension of unified TCI framework for mTRP.docx> [retrieved on 20220930] *

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