Patent Description:
<CIT> discusses methods and systems are for reducing control signaling. <CIT> discusses a method for generating/mapping an uplink DMRS sequence and a method for transmitting and receiving a DMRS by using the method.

In accordance with the present invention, there is provided a method of wireless communication performed by a user equipment as set out in claim <NUM>, and an apparatus for wireless communication as set out in claim <NUM>. Other aspects of the invention can be found in the dependent claims. Any embodiment referred to and not falling within the scope of the claims is merely an example useful to the understanding of the invention.

At base station <NUM>, a transmit processor <NUM> may receive data from a data source <NUM> for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs.

Controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform one or more techniques associated with demodulation reference signal port hopping, as described in more detail elsewhere herein. For example, controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform or direct operations of, for example, process <NUM> of <FIG>, process <NUM> of <FIG>, and/or other processes as described herein. Memories <NUM> and <NUM> may store data and program codes for base station <NUM> and UE <NUM>, respectively.

In some aspects, UE <NUM> may include means for receiving a configuration message with a configured grant for a plurality of uplink transmissions, means for transmitting, using a first demodulation reference signal port, a first transmission, of the plurality of uplink transmissions, associated with the configured grant, means for transmitting, using a second demodulation reference signal port that is different from the first demodulation reference signal port, a second transmission, of the plurality of uplink transmissions, associated with the configured grant, and/or the like. In some aspects, such means may include one or more components of UE <NUM> described in connection with <FIG>.

In some aspects, base station <NUM> may include means for providing a configuration message with a configured grant for a plurality of uplink transmissions, wherein the configuration message includes configuration information to cause a user equipment (UE) to transmit using a particular demodulation reference signal (DMRS) port hopping configuration, means for receiving a plurality of transmissions associated with the configured grant from the UE based at least in part on the particular DMRS port hopping configuration, and/or the like. In some aspects, such means may include one or more components of base station <NUM> described in connection with <FIG>.

Each subframe may have a predetermined duration (e.g., <NUM>) and may include a set of slots (e.g., <NUM>m slots per subframe are shown in <FIG>, where m is a numerology used for a transmission, such as <NUM>, <NUM>,<NUM>, <NUM>, <NUM>, and/or the like). In some aspects, a scheduling unit for the FDD may frame-based, subframe-based, slot-based, symbol-based, and/or the like.

Each resource block may cover a set to of subcarriers (e.g., <NUM> subcarriers) in one slot and may include a number of resource elements.

An interlace structure may be used for each of the downlink and uplink for FDD in certain telecommunications systems (e.g., NR). For example, Q interlaces with indices of <NUM> through Q - <NUM> may be defined, where Q may be equal to <NUM>, <NUM>, <NUM>, <NUM>, or some other value. Each interlace may include slots that are spaced apart by Q frames. In particular, interlace q may include slots q, q + Q, q + 2Q, etc., where q ∈ {<NUM>,. , Q-<NUM>}.

New Radio (NR) may refer to radios configured to operate according to a new air interface (e.g., other than Orthogonal Frequency Divisional Multiple Access (OFDMA)-based air interfaces) or fixed transport layer (e.g., other than Internet Protocol (IP)). In aspects, NR may utilize OFDM with a CP (herein referred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using time division duplexing (TDD).

In some communications systems, such as <NUM>, a UE may receive, from a BS, an indication of a configured grant. For example, the UE may receive a configuration message (e.g., a radio resource control (RRC) message) associated with indicating a set of resources that the UE is to use for a set physical uplink shared channel (PUSCH) transmissions. In this case, the UE may transmit a PUSCH communication, which may include a demodulation reference signal (DMRS) for channel estimation and a data transmission of payload data.

However, in some cases, the UE may not have data for transmission at a resource associated with a configured grant. Thus, some UEs may determine to transmit on the PUSCH without receiving a grant, which may be termed a grant-free transmission or a transmission with a configured grant. When the UE determines that a communication is to be transmitted (e.g., a packet is received by the UE at a media access control (MAC) layer), the UE may transmit a PUSCH communication at a transmission opportunity. In some cases, the BS may configure slot bundling or mini-slot bundling, and the UE may determine to transmit repetitions of the PUSCH communication at a plurality of transmission opportunities, thereby improving transmission reliability.

However, use of a common set of time resources, frequency resources, and/or the like by a plurality of UEs for unscheduled communication may result in an uplink transmission collision when two or more UEs attempt to transmit, concurrently, using a common frequency resource and time resource. As a result, the base station may receive a super-position of transmissions from two or more UEs.

A plurality of UEs may use orthogonal DMRS ports, which may be termed ports, to transmit DMRSs, thereby enabling uplink transmission collision detection and enabling a BS to identify which transmissions were transmitted by which UEs. Based at least in part on determining that a particular set of UEs were concurrently using a particular DMRS port for transmission, the BS may determine that the particular set of UEs have data for transmission, and may provide a retransmission grant to each of the particular set of UEs, thereby enabling successful transmission. However, a quantity of orthogonal DMRS ports for a particular time resource and/or frequency resource may be limited, thereby limiting a quantity of UEs that can transmit on a particular network without causing excessive collisions. Therefore, if two or more UEs transmit concurrently on the same resource using the same DMRS port, the BS may not be able to detect particular UEs that have data for transmission.

Some aspects described herein may enable DMRS port hopping. For example, a UE may transmit a first transmission associated with a configured grant using a first DMRS port and may transmit a second transmission associated with a configured grant using a second DMRS port. In this way, a quantity of UEs that can be supported by a particular set of time resources and frequency resources may be increased relative to static DMRS port utilization, thereby improving utilization of network resources. Additionally, or alternatively, the techniques described herein may reduce a likelihood of two or more UEs transmitting concurrently on the same resource using the same DMRS port, thereby improving the reliability of uplink communication with configured grant.

<FIG> are diagrams illustrating an example <NUM> of demodulation reference signal port hopping, in accordance with various aspects of the present disclosure. As shown in <FIG>, example <NUM> includes a BS <NUM> and a UE <NUM>.

As further shown in <FIG>, and by reference number <NUM>, UE <NUM> receive, from BS <NUM>, a configuration message including a grant for configuring a plurality of PUSCH transmissions. For example, BS <NUM> may provide a grant indicating that UE <NUM> is to use a particular time resource, frequency resource, DMRS port hopping configuration, and/or the like for transmission of the plurality of transmissions. In some aspects, UE <NUM> may receive a plurality of configuration messages identifying a plurality of configured grants. For example, UE <NUM> may receive a first uplink configured grant for a first uplink configured grant transmission, a second uplink configured grant for a second uplink configured grant transmission, and/or the like. In this case, UE <NUM> may determine a particular DMRS port hopping configuration, as described herein, based at least in part on an uplink configured grant index (e.g., based at least in part on an uplink configured grant relating to a DMRS transmission).

As further shown in <FIG>, and by reference number <NUM>, UE <NUM> determines a DMRS port hopping configuration. As shown by reference number <NUM>, UE <NUM> determines to perform DMRS port hopping on a per transmission occasion basis. UE <NUM> determines to use a first DMRS port (DMRS1) for a first transmission in a first transmission occasion, a second DMRS port (DMRS2) for a second transmission in a second transmission occasion, a third DMRS port (DMRS3) for a third transmission in a third transmission occasion, and/or the like.

, UE <NUM> determines a DMRS port to use for a transmission in a transmission occasion based at least in part on a user equipment identifier or a transmission occasion index (e.g., a grant-free PUSCH occasion index value) for the transmission occasion for which the DMRS port is to be used. For example, UE <NUM> may determine a set of DMRS ports to use for a sequence of PUSCH transmissions, and may determine the set of DMRS ports based at least in part on the user equipment identifier and a respective transmission occasion index for each transmission at each transmission occasion. In this way, UE <NUM> enables DMRS port hopping for grant-free PUSCH communication.

As shown in <FIG>, and by reference number <NUM>, UE <NUM> determines to perform DMRS port hopping on a per communication repetition basis. In a single transmission occasion (e.g., Occasion <NUM>), UE <NUM> determines to transmit a plurality of repetitions of a single communication (e.g., a packet), and uses a first DMRS port for a first transmission of the single communication and a second DMRS port for a second transmission (of a repetition) of the single communication. In this way, UE <NUM> enables DMRS port hopping within a single transmission occasion for grant-free PUSCH communication.

In some aspects, UE <NUM> may select a set of DMRS ports for the single transmission occasion based at least in part on a quantity of repetitions in the single transmission occasion. For example, when a transmission occasion is configured for <NUM> repetition opportunities (e.g., a transmission of a communication and <NUM> re-transmissions of the communication), which may correspond to <NUM> slots (or mini-slots) as shown, UE <NUM> may determine to use a set of <NUM> DMRS ports for the <NUM> repetition opportunities (e.g., DMRS1 for a first repetition opportunity, DMRS2 for a second repetition opportunity, DMRS3 for a third repetition opportunity, and DMRS4 for a fourth repetition opportunity).

In some aspects, UE <NUM> may select a DMRS port for utilization based at least in part on a repetition opportunity index rather than a repetition index. For example, as shown in the first transmission occasion, when a packet is generated at a MAC layer during a second repetition opportunity, UE <NUM> may schedule a first transmission in the third repetition opportunity, and may use the third DMRS port for the first transmission rather than the first DMRS port. Similarly, UE <NUM> may use the fourth DMRS port for a second transmission (e.g., a repetition of the first transmission) in the fourth repetition opportunity. Similarly, in the second transmission occasion where transmission is to start at the second repetition opportunity, UE <NUM> may use the second DMRS port, the third DMRS port, and the fourth DMRS port for a first transmission, a second transmission, and a third transmission, respectively.

Additionally, or alternatively, as shown in <FIG>, and by reference number <NUM>, UE <NUM> may determine to perform DMRS port hopping on a per symbol group basis. For example, when UE <NUM> is configured to perform frequency hopping (e.g., intra-slot or mini-slot frequency hopping), UE <NUM> may determine to use a first DMRS port (DMRS1) for a first frequency hop and for a first transmission and a second DMRS port (DMRS2) for a second frequency hop and for a second transmission in a single repetition opportunity. As shown by reference number <NUM>, when UE <NUM> is not configured to perform frequency hopping and when a PUSCH communication includes a plurality of DMRS transmission locations (e.g., at a plurality of time resources), UE <NUM> may determine to use a first DMRS port for a first DMRS transmission location and a second DMRS port for a second DMRS transmission location in a single repetition opportunity. In this way, UE <NUM> enables DMRS port hopping within a single slot and/or repetition opportunity.

Additionally, or alternatively, as shown in <FIG>, and by reference number <NUM>, UE <NUM> may determine to perform DMRS port hopping on a per resource block group basis. For example, for a bandwidth of a PUSCH divided into a set of resource block groups with each resource block group including a plurality of resource blocks, UE <NUM> may use a first DMRS port (Port <NUM>) in a first resource block group, a second DMRS port (Port <NUM>) in a second resource block group, a third DMRS port (Port <NUM>) in a third resource block group, a fourth DMRS port (Port <NUM>) in a fourth resource block group, and/or the like. In this case, each DMRS symbol of a set of DMRS symbols may support the <NUM> DMRS ports with orthogonality by using <NUM> code division multiplexed (CDM) DMRS ports and <NUM> frequency division multiplexed (FDM) DMRS ports within a single resource block. In this way, UE <NUM> enables DMRS port hopping for resource block groups within a DMRS symbol while maintaining orthogonality for DMRS ports within the DMRS symbol. In another example, a single DMRS symbol may support <NUM> DMRS ports using, for example, CDM techniques.

In some aspects, a plurality of DMRS ports may form a CDM group. For example, a particular DMRS configuration may support <NUM> DMRS ports on a single comb, and may support <NUM> DMRS ports on the same DMRS symbol using <NUM> CDM groups and <NUM> combs (each including <NUM> DMRS ports).

In some aspects, UE <NUM> may determine to perform DMRS port hopping on a plurality of bases (e.g., two bases, three bases, four bases, and/or the like), and may separately configure each DMRS port hopping basis. For example, UE <NUM> may determine to perform DMRS port hopping on a per transmission occasion basis and a per communication repetition basis. In this case, for the per transmission occasion basis, UE <NUM> may determine to perform DMRS port hopping based at least in part on an index of the transmission occasion, and for the per communication repetition basis, UE <NUM> may determine to perform DMRS port hopping based at least in part on a configured per communication repetition port hopping pattern and an index of a repetition opportunity. As an example, UE <NUM> may be configured with a DMRS port hopping pattern, e.g., a DMRS port sequence {DMRS0, DMRS1, DMRS2, and DMRS3} for the per communication repetition basis, and may initialize the DMRS port sequence for each transmission occasion as follows: in a first transmission occasion, index <NUM>, with a set of <NUM> sequential repetition opportunities, UE <NUM> may determine to use a sequence of DMRS ports starting with index <NUM>, {DMRS0, DMRS1, DMRS2, and DMRS3} mod <NUM>, resulting in the sequence of DMRS ports being {DMRS0, DMRS1, DMRS2, and DMRS3} for the <NUM> sequential repetition opportunities, respectively. Further, for a second transmission occasion, index <NUM>, UE <NUM> may determine the sequence starting with index <NUM> as {DMRS2, DMRS3, DMRS4, and DMRS5} mod <NUM> to determine the sequence for a second transmission occasion, resulting in a sequence of DMRS ports {DMRS2, DMRS3, DMRS0, DMRS1} for the second transmission occasion (e.g., in this case, DMRS5 mod <NUM> may result in selection of DMRS1). In this way, UE <NUM> may utilize a plurality of DMRS port hopping schemes for port hopping.

In some aspects, UE <NUM> may schedule different DMRS ports for different DMRS tones. For example, UE <NUM> may schedule DMRS0 and DMRS1 on even indexed DMRS tones and DMRS2 and DMRS3 on odd indexed DMRS tones. In this case, DMRS0 and DMRS1 may form a first CDM group <NUM> and DMRS2 and DMRS3 may form a second CDM group <NUM>. As another example, when a DMRS configuration supports <NUM> DMRS ports on a single DMRS symbol, a third CDM group may be formed from fifth and sixth DMRS ports (e.g., DMRS4 and DMRS5, respectively).

In some aspects, UE <NUM> may receive an indication of CDM groups that are to be occupied by other UEs, such as for multiple-user, multiple-input, multiple-output (MU-MIMO) operation. For example, BS <NUM> may indicate a DMRS port index and may indicate that, for example, that UE <NUM> is to use a DMRS port in the first CDM group and may indicate one or more reserve frequencies and/or tones corresponding to a second CDM group is to be used by other UEs and not by UE <NUM> for a particular DMRS or PUSCH transmission. In this case, UE <NUM> may not transmit a PUSCH on tones of the second CDM, which may enable the other UEs to transmit other DMRSs on tones of the second CDM group. In some aspects BS <NUM> may indicate that the second CDM group is not to be used by UE <NUM> or other UEs for DMRS transmissions and UE <NUM> may rate match a PUSCH around the second CDM group.

In some aspects, BS <NUM> may provide and UE <NUM> may receive a CDM group indication using a particular signaling. For example, BS <NUM> may indicate CDM groups occupied by each UE and for each PUSCH transmission associated with a configured grant. In this case, UE <NUM> may rate-match a PUSCH around indicated CDM groups. Further, when performing DMRS port hopping, UE <NUM> may limit which DMRS ports are selected to DMRS ports included in indicated CDM groups (e.g., UE <NUM> may avoid DMRS ports associated with non-indicated CDM groups). In some aspects, BS <NUM> may indicate CDM groups for a particular configured grant transmission (e.g., a sequentially first configured grant transmission). In this case, UE <NUM> may determine which CDM groups are occupied for each subsequent PUSCH transmission and select DMRS ports based on the occupied CDM groups and the non-indicated DMRS ports. In some aspects, UE <NUM> may rate-match a PUSCH around a set of determined CDM groups (e.g., including one or more CDM groups that are not indicated for use in connection with a particular configured grant transmission occasion). In some aspects, BS <NUM> may indicate a particular set of CDM groups and UE <NUM> may rate match around all CDM groups (e.g., UE <NUM> may forgo transmitting a PUSCH using DMRS symbols).

In some aspects, UE <NUM> may determine to perform DMRS port hopping on a plurality of bases, and may jointly configure all DMRS port hopping bases. For example, UE <NUM> may determine a DMRS port based at least in part on a user equipment identifier, a DMRS location value, and a resource block group index value, thereby resulting in DMRS port hopping being performed, concurrently, on a per transmission occasion basis, a per communication repetition basis, a per symbol group basis, and a per resource block group basis. As another example, UE <NUM> may determine a DMRS port for a set of transmissions based at least in part on a user equipment identifier and a slot index or mini-slot index, thereby enabling DMRS port hopping to be performed, concurrently, on a per transmission occasion basis and a per communication repetition basis (and not on a per symbol group basis or a per resource block group basis).

In some aspects, UE <NUM> may determine to perform DMRS port hopping for a set of multiple-input multiple-output (MIMO) transmissions. In this case, each MIMO transmission may be associated with a plurality of DMRS ports, and DMRS port hopping may be performed. For example, UE <NUM> may determine a first DMRS port and a second DMRS port for concurrent use for a first transmission, and may determine to DMRS port hop to a third DMRS port and a fourth DMRS port, respectively, for concurrent use for a second transmission. In this case, UE <NUM> and BS <NUM> may use the first DMRS port and the third DMRS port for channel estimation of a first spatial layer for the first transmission and the second transmission, respectively, and the second DMRS port and the fourth DMRS port for channel estimation of a second spatial layer for the first transmission and the second transmission, respectively.

In some aspects, UE <NUM> may use a single DMRS port hopping configuration for all DMRS ports. For example, UE <NUM> may perform DMRS port hopping on a per transmission occasion basis for a DMRS port hop from the first DMRS port to the third DMRS port and for a DMRS port hop from the second DMRS port to the fourth DMRS port. Additionally, or alternatively, UE <NUM> may perform DMRS port hopping on a per transmission occasion basis for a DMRS port hop from the first DMRS port to the third DMRS port, and may perform DMRS port hopping on a per communication repetition basis for a DMRS port hop from the second DMRS port to the fourth DMRS port. Additionally, or alternatively, UE <NUM> may perform DMRS port hopping on a per transmission occasion basis for a DMRS port hop from the first DMRS port to the third DMRS port for the first spatial layer and may not perform DMRS port hopping for the second spatial layer (e.g., the second DMRS port and the fourth DMRS port may be a common DMRS port).

Returning to <FIG>, and as shown by reference number <NUM>, UE <NUM> transmits a first transmission using a first DMRS port. Using the first DMRS port, UE <NUM> transmits the first transmission, which may include a first DMRS and first payload data for communication to BS <NUM>. UE <NUM> transmits the first transmission in a single repetition opportunity of a transmission occasion, in a group of symbols of the single repetition opportunity of the transmission occasion, in a resource block group of resource blocks of a group of symbols of a single repetition of the transmission occasion, and/or the like.

As further shown in <FIG>, and by reference number <NUM>, UE <NUM> transmits a second transmission, which is associated with a same configured grant as the first transmission, using a second DMRS port. Using the second DMRS port, UE <NUM> transmits the second transmission, which may include a second DMRS and second payload data for communication to BS <NUM>. The UE <NUM> transmits the second transmission in a different repetition opportunity of a same transmission occasion as for the first transmission. Additionally, UE <NUM> may transmit the second transmission in a different group of symbols (e.g., a different frequency hop or DMRS location) of a same repetition opportunity as for the first transmission. Additionally, or alternatively, UE <NUM> may transmit the second transmission in a different resource block group of a same group of symbols as for the first transmission. In this way, UE <NUM> enables DMRS port hopping for grant-free PUSCH communication.

In some aspects, BS <NUM> receives the first transmission and the second transmission. , Based at least in part on providing configuration information configuring a particular DMRS port hopping configuration for UE <NUM>, BS <NUM> receives transmissions from UE <NUM>, and may detect the particular DMRS port hopping configuration to identify UE <NUM>. In this case, based at least in part on identifying UE <NUM> and determining a transmission collision, BS <NUM> provide a retransmission grant to enable UE <NUM> to retransmit a colliding transmission, and UE <NUM> retransmit the colliding transmission using resources associated with the retransmission grant.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process <NUM> is an example where a UE (e.g., UE <NUM>) performs demodulation reference signal port hopping.

As shown in <FIG>, in some aspects, process <NUM> includes receiving a configuration message with a configured grant for a plurality of uplink transmissions (block <NUM>). For example, the UE (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, and/or the like) may receive the configuration message with the configured grant for the plurality of uplink transmissions, as described in more detail above.

As shown in <FIG>, process <NUM> includes transmitting, using a first demodulation reference signal port, a first transmission, of the plurality of uplink transmissions, associated with the configured grant (block <NUM>). For example, the UE (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like) transmits using the first demodulation reference signal port, the first transmission, of the plurality of uplink transmissions, associated with the configured grant, as described in more detail above.

As shown in <FIG> process <NUM> includes transmitting, using a second demodulation reference signal port that is different from the first demodulation reference signal port, a second transmission, of the plurality of uplink transmissions, associated with the configured grant (block <NUM>). For example, the UE (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like) transmits, using the second demodulation reference signal port that is different from the first demodulation reference signal port, the second transmission, of the plurality of uplink transmissions, associated with the configured grant, as described in more detail above.

In a first aspect, the first transmission includes a first demodulation reference signal associated with the first demodulation reference signal port and the second transmission includes a second demodulation reference signal associated with the second demodulation reference signal port.

In a second aspect, alone or in combination with the first aspect, the first transmission includes first payload data and the second transmission includes second payload data.

In a third aspect, alone or in combination with one or more of the first and second aspects, the first transmission includes a first communication and the UE is configured to transmit the first transmission in a first transmission occasion. In some aspects, the second transmission includes a second communication that is different from the first communication and that is different from the first transmission occasion and the UE is configured to transmit the second transmission in a second transmission occasion.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the UE is configured to determine at least one of the first demodulation reference signal port or the second demodulation reference signal port based at least in part on a user equipment identifier, and in part on at least one of a configured grant occasion index, a repetition opportunity index, a slot index, a mini-slot index, a symbol index, a DMRS location index, a resource block group index, or an uplink configured grant index.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the first transmission is a particular communication and the UE is configured to transmit the first transmission in a particular transmission occasion. In some aspects, the second transmission is a repetition of the particular communication and the UE is configured to transmit the second transmission in the particular transmission occasion.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the UE is configured to transmit the first transmission in a first slot or mini-slot and the second transmission in a second slot or mini-slot that is different from the first slot or mini-slot.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the UE is configured to transmit the first transmission using a first portion of a physical uplink shared channel transmission and the second transmission using a second portion of the physical uplink shared channel transmission that is different from the first portion of the physical uplink shared channel transmission.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the first portion is a first one or more symbols and the second portion is a second one or more symbols.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the first portion is associated with a first frequency and the second portion is associated with a second frequency that is different than the first frequency.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the first portion is associated with a first demodulation reference signal in a particular slot of a transmission occasion and the second portion is associated with a second demodulation reference signal in the particular slot of the transmission occasion.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the UE is configured to transmit the first transmission during a first one or more resource blocks of a slot and the second transmission during a second one or more resource blocks of the slot that is different than the first one or more resource blocks of the slot.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the UE is configured to determine a selected set of demodulation reference signal ports, which includes the first demodulation reference signal port and the second demodulation reference signal port, based at least in part on a quantity of repetitions of a physical uplink shared channel within a transmission occasion.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the UE is configured to select the selected set of demodulation reference signal ports based at least in part on a repetition opportunity index.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the configuration message configures a set of demodulation reference signal ports, which includes the first demodulation reference signal port and the second demodulation reference signal port, and where a quantity of demodulation reference signal ports is selected based at least in part on a repetition parameter such that each demodulation reference signal port, of the set of demodulation reference signal ports, corresponds to a repetition occasion.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the first demodulation reference signal port is associated with a first demodulation reference signal pattern and the second demodulation reference signal port is associated with a second demodulation reference signal pattern that is different than the first demodulation reference signal pattern.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the UE is configured to perform demodulation reference signal port hopping to use a plurality of demodulation reference signal ports concurrently on two or more bases of: a per transmission occasion basis, a per communication repetition basis, a per symbol group basis, or a per resource block group basis.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the UE is configured to separately determine a demodulation reference signal hopping configuration for each of the two or more bases and to apply each separately determined demodulation reference signal hopping configuration to a corresponding basis.

In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the UE is configured to jointly determine a demodulation reference signal hopping configuration for all of the two or more bases.

In a nineteenth aspect, alone or in combination with one or more of the first through eighteenth aspects, the first transmission is a first multiple-input multiple-output transmission and the first demodulation reference signal port is a first port and a second port and the second transmission is a second multiple-input multiple-output transmission and the second demodulation reference signal port is a third port and a fourth port.

In a twentieth aspect, alone or in combination with one or more of the first through nineteenth aspects, the UE is configured to determine a hop from the first port to the third port using a particular hopping configuration and from the second port to the fourth port using the particular hopping configuration.

In a twenty first aspect, alone or in combination with one or more of the first through twentieth aspects, the UE is configured to determine a hop from the first port to the third port using a first hopping configuration and from the second port to the fourth port using a second hopping configuration that is different from the first hopping configuration.

In a twenty second aspect, alone or in combination with one or more of the first through twenty first aspects, the UE is configured to forgo transmitting using at least one demodulation reference signal port to enable one or more other UEs to transmit using the at least one demodulation reference signal port. For example, the UE may forgo transmitting a DMRS on a DMRS port or may forgo transmitting a PUSCH on a DMRS ports.

In a twenty third aspect, alone or in combination with one or more of the first through twenty second aspects, the UE is configured to transmit a physical uplink shared channel using one or more other demodulation reference signal ports.

In a twenty fourth aspect, alone or in combination with one or more of the first through twenty third aspects, the first port and the third port are different ports and the second port and the fourth port are different ports.

In a twenty fifth aspect, alone or in combination with one or more of the first through twenty fourth aspects, the first port and the third port are different ports and the second port and the fourth port are a common port.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a BS, in accordance with various aspects of the present disclosure. Example process <NUM> is an example where a BS (e.g., BS <NUM>) performs demodulation reference signal port hopping.

As shown in <FIG>, in some aspects, process <NUM> may include providing a configuration message with a configured grant for a plurality of uplink transmissions, wherein the configuration message includes configuration information to cause a user equipment (UE) to transmit using a particular demodulation reference signal (DMRS) port hopping configuration (block <NUM>). For example, the BS (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like) may provide a configuration message with a configured grant for a plurality of uplink transmissions, as described in more detail above. In some aspects, the configuration message includes configuration information to cause a user equipment (UE) to transmit using a particular demodulation reference signal (DMRS) port hopping configuration.

As shown in <FIG>, in some aspects, process <NUM> may include receiving a plurality of transmissions associated with the configured grant from the UE based at least in part on the particular DMRS port hopping configuration (block <NUM>). For example, the BS (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, and/or the like) may receive a plurality of transmissions associated with the configured grant from the UE based at least in part on the particular DMRS port hopping configuration, as described in more detail above.

In a first aspect, the BS is configured to receive a first transmission, of the plurality of transmissions, associated with the configured grant and transmitted using a first DMRS port. In some aspects, the BS is configured to receive a second transmission, of the plurality of transmissions, associated with the configured grant and transmitted using a second DMRS port that is different from the first DMRS port.

In a second aspect, alone or in combination with the first aspect, the BS is configured to identify the UE based at least in part on receiving the plurality of transmissions and based at least in part on the particular DMRS port hopping configuration.

In a third aspect, alone or in combination with one or more of the first and second aspects, the BS is configured to provide a retransmission grant for a transmission of the plurality of transmissions based at least in part on the particular DMRS port hopping configuration.

Claim 1:
A method of wireless communication performed by a user equipment, UE, (<NUM>) comprising:
receiving (<NUM>) a configuration message with a configured grant indicating a transmission occasion for a plurality of uplink transmissions, wherein the transmission occasion comprises a set of transmission opportunities each transmission opportunity available for transmission of a respective repetition of a single communication and associated with a different time resource within the transmission occasion, and wherein the configuration message includes configuration information to cause the UE to transmit using a particular demodulation reference signal, DMRS, port hopping configuration, and wherein said DMRS port hopping configuration configures the UE to:
select a set of different demodulation reference signal, DMRS, ports, each corresponding to a different transmission opportunity in the transmission occasion;
transmit (<NUM>), using a first DMRS port of the selected set of DMRS ports, a first transmission of the single communication in a corresponding first transmission opportunity of the transmission occasion; and
transmit (<NUM>), using a second DMRS port, that is different from the first DMRS port, a repetition of the single communication in a corresponding second transmission opportunity of the transmission occasion.