INDICATION OF SUB-PHYSICAL RESOURCE BLOCK WITH FREQUENCY-DOMAIN RESOURCE ALLOCATION FIELD

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a frequency domain resource allocation (FDRA) field in downlink control information for a transport block that is sized over multiple repetitions. The UE may reinterpret bits in the FDRA field, which indicate an allocated quantity of physical resource blocks (PRBs) greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication. The UE may transmit the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field. Numerous other aspects are provided.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for indicating a sub-physical resource block with a frequency domain resource allocation field.

BACKGROUND

SUMMARY

In some aspects, a method of wireless communication performed by a user equipment (UE) includes receiving a frequency domain resource allocation (FDRA) field in downlink control information (DCI) for a transport block that is sized over multiple repetitions; reinterpreting bits in the FDRA field, which indicate an allocated quantity of physical resource blocks (PRBs) greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication. The method may include transmitting the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field.

In some aspects, a method of wireless communication performed by a base station includes generating bits for an FDRA field that are to be reinterpreted by UE for transmitting a sub-PRB communication and transmitting, to the UE, the bits in the FDRA field in DCI. The method may include receiving, from the UE, the sub-PRB communication.

In some aspects, an apparatus for wireless communication at a UE includes a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to receive an FDRA field in DCI for a transport block that is sized over multiple repetitions and reinterpret bits in the FDRA field, which indicate an allocated quantity of PRBs greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication. The one or more processors may be configured to transmit the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field.

In some aspects, an apparatus for wireless communication at a base station includes a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to generate bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication and transmit, to the UE, the bits in the FDRA field in DCI. The one or more processors may be configured to receive, from the UE, the sub-PRB communication.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to receive an FDRA field in DCI for a transport block that is sized over multiple repetitions; reinterpret bits in the FDRA field, which indicate an allocated quantity of PRBs greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication; and transmit the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the base station to generate bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication, transmit, to the UE, the bits in the FDRA field in DCI, and receive, from the UE, the sub-PRB communication.

In some aspects, an apparatus for wireless communication includes means for receiving an FDRA field in DCI for a transport block that is sized over multiple repetitions; means for reinterpreting bits in the FDRA field, which indicate an allocated quantity of PRBs greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication; and means for transmitting the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field.

In some aspects, an apparatus for wireless communication includes means for generating bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication, means for transmitting, to the UE, the bits in the FDRA field in DCI, and means for receiving, from the UE, the sub-PRB communication.

DETAILED DESCRIPTION

In some aspects, UE120includes means for receiving an FDRA field in downlink control information (DCI) for a transport block that is sized over multiple repetitions; means for reinterpreting bits in the FDRA field, which indicate an allocated quantity of PRBs greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication; or means for transmitting the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field. The means for UE120to perform operations described herein may include, for example, one or more of antenna252, demodulator254, MIMO detector256, receive processor258, transmit processor264, TX MIMO processor266, modulator254, controller/processor280, or memory282.

In some aspects, UE120includes means for determining that the sub-PRB communication is a start PRB based at least in part on a determination that an allocated length of the PRB does not satisfy a length threshold.

In some aspects, UE120includes means for determining that the sub-PRB communication is an end PRB based at least in part on a determination that an allocated length of the PRB satisfies a length threshold.

In some aspects, UE120includes means for determining whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a bandwidth part within which the sub-PRB communication is transmitted.

In some aspects, UE120includes means for reinterpreting a bit in an MCS field in the DCI to indicate that the PRB for uplink transmission is a sub-PRB communication.

In some aspects, UE120includes means for determining whether the sub-PRB communication is a start PRB or an end PRB based at least in part on the bit in a modulation and coding scheme field.

In some aspects, base station110includes means for generating bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication; means for transmitting, to the UE, the bits in the FDRA field in DCI; or means for receiving, from the UE, the sub-PRB communication. The means for base station110to perform operations described herein may include, for example, one or more of transmit processor220, TX MIMO processor230, modulator232, antenna234, demodulator232, MIMO detector236, receive processor238, controller/processor240, memory242, or scheduler246.

In some aspects, base station110includes means for receiving a start PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that does not satisfy a length threshold.

In some aspects, base station110includes means for receiving an end PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that satisfies a length threshold.

In some aspects, base station110includes means for indicating, via an allocated length of a PRB and an indicated quantity of PRBs in the bits in the FDRA field, whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a bandwidth part (BWP) within which the sub-PRB communication is transmitted.

FIG.3is a diagram illustrating an example300of a slot format, in accordance with various aspects of the present disclosure. As shown inFIG.3, time-frequency resources in a radio access network may be partitioned into resource blocks, shown by a single PRB305. A PRB305includes a set of subcarriers (e.g.,12subcarriers) and a set of symbols (e.g., 14 symbols) that are schedulable by a base station110as a unit. In some aspects, a PRB305may include a set of subcarriers in a single slot. As shown, a single time-frequency resource included in a PRB305may be referred to as a resource element (RE)310. An RE310may include a single subcarrier (e.g., in frequency) and a single symbol (e.g., in time). A symbol may be referred to as an orthogonal frequency division multiplexing (OFDM) symbol. An RE310may be used to transmit one modulated symbol, which may be a real value or a complex value.

In some telecommunication systems (e.g., NR), PRBs305may span12subcarriers with a subcarrier spacing of, for example, 15 kilohertz (kHz), 30 kHz, 60 kHz, or 120 kHz, among other examples, over a 0.1 millisecond (ms) duration. A radio frame may include 40 slots and may have a length of 10 ms. Consequently, each slot may have a length of 0.25 ms. However, a slot length may vary depending on a numerology used to communicate (e.g., a subcarrier spacing, a cyclic prefix format, and/or the like). A slot may be configured with a link direction (e.g., downlink or uplink) for transmission. In some aspects, the link direction for a slot may be dynamically configured.

A UE may transmit a transport block in different scenarios. In some circumstances, the UE may benefit from enhanced coverage. A bottleneck for enhanced coverage may be a transmit power of the UE. Some techniques may increase an amount of transmit power for a bandwidth and thus increase a power spectrum density (PSD). One technique to increase the PSD may include transport block size scaling, which involves transmitting a transport block with multiple repetitions over multiple slots using a smaller bandwidth. A base station may configure a quantity of the repetitions via a radio resource control (RRC) message or DCI.

Another technique for increasing PSD for an uplink transport block may include transmitting a sub-PRB communication. A sub-PRB communication may include half of a PRB, which may increase the PSD by 3 decibels (dB) with respect to a full PRB.

A base station may schedule communications for a UE using DCI. The DCI may include bits in an FDRA field that allocates frequency domain resources for the UE on a physical uplink shared channel (PUSCH). There may be two types of FDRA, FDRA Type 0 and FDRA Type 1.

FDRA Type 0 (applicable to CP-OFDM)) may include a bitmap of resource block groups (RGBs) with a quantity of bits. An RBG size may be based at least in part on a BWP size and a configuration. For example, a BWP size of 1-36 PRBs may include 2 bits for a first configuration and 4 bits for a second configuration; a BWP size of 37-72 PRBs may include 4 bits for a first configuration and 8 bits for a second configuration; a BWP size of 73-144 PRBs may include 8 bits for a first configuration and 16 bits for a second configuration; and a BWP size of 145-275 PRBs may include 16 bits for a first configuration and 16 bits for a second configuration.

FDRA Type 1 (applicable to both DFT-s-OFDM and CP-OFDM) may include a start and length indicator value (SLIV), which may also be referred to as a “resource indication value” (RIV). The SLIV or RIV may be based at least in part on an indicated quantity of PRBs LRBand a BWP size NRBBWPin a quantity of PRBs, where the BWP is an uplink BWP within which a full-PRB communication is transmitted. For example, if (LRB−1)≤└RBBWP/2┘, then RIV=RBBWP(LRB−1)+RBstart, where RBstartis a starting PRB value. Otherwise, RIV=RBBWP(NRBBWP−LRB−1)+(NRBBWP−1−RBstart). The allocated length (quantity of PRBs) LRBsatisfies 1≤LRB≤NRBBWP−RBstart. A total number of bits for Type 1 FDRA may be ┌log2(NRBBWP(NRBBWP+1)/2)┐ bits in a scheduling DCI. If both Type 0 and Type 1 FDRA are configured, then the scheduling DCI may indicate which type is used, and there are max(┌log2(NRBBWP(NRBBWP+1)/2)┐, NRBG)+1 bits in the FDRA field of the scheduling DCI, where a most significant bit is used to indicate which type of FDRA is used.

However, while an FDRA field in scheduling DCI may be used to allocate resources to a UE for uplink communications, the FDRA field does not support indications for sub-PRB communications. If additional bits are added to the DCI, in addition to the FDRA, to indicate a sub-PRB communication is to be transmitted on a PUSCH and which part of a PRB is transmitted, this would increase DCI overhead. Increasing DCI overhead may cause the UE and the base station to consume additional processing resources and signaling resources.

According to various aspects described herein, a base station may indicate, by FDRA in scheduling DCI, that an uplink transmission is to be a sub-PRB communication. For example, if an allocated quantity of PRBs LRBsatisfies an allocation threshold Nthr, a UE may reinterpret associated bits in the FRDA to indicate that a PRB communication on the PUSCH is to be a sub-PRB communication. The sub-PRB communication may be a half-PRB, third-PRB, quarter-PRB, sixth-PRB communication, or any other portion of a PRB communication. The half PRB may be a start PRB or an end PRB. For example, if (LRB−1)≤└NRBBWP/2 ┘, the UE may reinterpret the allocated quantity of PRBs LRBto indicate a start PRB. Otherwise, if (LRB−1)>└NRBBWP/2┘, the UE may reinterpret the allocated quantity of PRBs LRBto indicate an end PRB. In this way, the UE may receive an indication of a sub-PRB communication without additional DCI overhead and transmit the sub-PRB communication so as to increase a PSD for transmission. As a result, the UE may increase performance without the UE and the BS consuming additional processing resources and signaling resources for additional DCI overhead.

The sub-PRB communication indication by the FDRA may be applicable to a transport block that is sized over multiple repetitions. In some aspects, the multiple repetitions may be limited based at least in part on a bandwidth of the PUSCH. For example, a product of a quantity of the repetitions and the bandwidth may be no greater than a particular threshold.

In some aspects, the base station may indication sub-PRB transmission with an MCS field in scheduling DCI. For example, a most significant bit in the MCS field may indicate whether a sub-PRB communication is to be a start PRB or an end PRB.

FIG.4is a diagram illustrating an example400of indicating a sub-PRB for uplink transmission with an FDRA field, in accordance with various aspects of the present disclosure. As shown inFIG.4, a base station410(e.g., BS110) and a UE420(e.g., UE120) may communicate with one another on an uplink or a downlink.

As shown by reference number430, BS410may generate bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication. For example, BS410may generate bits indicating a quantity of PRBs that is above an allocation threshold so as to indicate a sub-PRB communication. BS410may generate the bits in the FDRA such that UE420reinterprets the bits to indicate a start PRB or an end PRB based at least in part on another threshold quantity of bits.

In some aspects, BS410may indicate whether a PRB communication is a sub-PRB communication with one or more bits in an MCS field. The one or more bits in the MCS field may be reinterpreted to indicate sub-PRB transmission. For example, a most significant bit of a 5-bit MCS field may be used for this reinterpretation, because 4 bits may be enough to represent MCS indexes of quadrature phase shift key modulation (with this one more bit, the number of sub-PRB allocation states can be doubled). BS410may use a most significant bit in the MCS field. In some aspects, BS410may generate one or more bits in the MCS field to indicate whether a sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB. BS410may use one or more bits in the MCS field to indicate a start PRB or an end PRB.

In some aspects, sub-PRB transmission may be limited for quantity of repetitions greater than 1 to prevent a transport block size associated with a single slot from being too small, which may be a small coding gain. Such a threshold of the quantity of repetitions may be indicated via an RRC message or DCI. The FDRA bits may be reduced to be associated with a threshold number of PRBs (Nthr), such as ┌log2(NRBBWP·Nthr) bits, or ┌log2(NRBBWP·Nthr−Nthr+1)┐ bits.

The use of transport blocks sized over M repetitions may be based at least in part the product of M and the bandwidth of the PUSCH (e.g., M*LRB) satisfying a threshold. For example, UE420may not size a transport block over multiple repetitions if the product is greater than the threshold.

As shown by reference number435, BS410may transmit the FDRA field in scheduling DCI to UE440. As shown by reference number440, UE420may reinterpret bits in the FDRA field and/or the MCS field to indicate a sub-PRB communication. For example, if an allocated quantity of PRBs LRBsatisfies an allocation threshold Nthr, UE420may reinterpret associated bits in the FRDA to indicate that a PRB communication on the PUSCH is to be a sub-PRB communication. In some aspects, if (LRB−1)≤[NRBBWP/2], the UE may reinterpret the allocated quantity of PRBs LRBto indicate a start PRB. Otherwise, if (LRB−1)≥└NRBBWP/2┘, the UE may reinterpret the allocated quantity of PRBs LRBto indicate an end PRB.

In some aspects, if (LRB−1)≤└NRBBWP/2┘, In the UE may reinterpret a start PRB (e.g., indicated in an SLIV) to indicate a PRB whose portion is transmitted, and may reinterpret the allocated quantity of PRBs LRBto indicate a sub-PRB resource allocation or one or more sub-PRB portions. Otherwise, if (LRB−1)>└NRBBWP/2┘, In the UE may reinterpret an end PRB to indicate a PRB whose portion is transmitted, and may reinterpret the allocated quantity of PRBs LRBto indicate a sub-PRB resource allocation or one or more sub-PRB portions.

In some aspects, UE420may reinterpret one or more bits in an MCS field in the DCI to indicate whether a sub-PRB communication is a first half of a PRB, a second half of a PRB, a start PRB, an end PRB, or a particular combination of one or more portions of a PRB.

As shown by reference number445, UE420may transmit the sub-PRB communication. By following the same reinterpretation rules as UE420, BS410may expect the sub-PRB communication that is based at least in part on UE420reinterpreting bits in an FDRA field and/or MCS field in scheduling DCI to determine the sub-PRB communication.

FIG.5is a diagram illustrating an example500associated with indicating a sub-PRB resource allocation for uplink transmission with an FDRA field, in accordance with various aspects of the present disclosure.

Example500shows different halves of a PRB for sub-PRB transmission. Example500also shows different combinations of quarters of a PRB for sub-PRB transmission. A UE may reinterpret FDRA bits (e.g., a length of PRBs LRB) to indicate sub-PRB allocation states, such as a first half or a second half for half-PRB transmission, or combinations of quarters for quarter-PRB transmission. If (LRB−1) └NRBBWP/2┘, the UE may reinterpret the FDRA bits to indicate a sub-PRB allocation communication by LRB, e.g. LRB−Nthr−1. Otherwise, for (LRB−1)>└NRBBWP/2┘, the reinterpretation to sub-PRB allocation state may be determined by NRBBWP−LRB, e.g. NRBBWP−LRB−Nthr+1. The UE may reinterpret FDRA bits and/or MCS bits to indicate any combination of portions of a PRB. In this way, the base station and the UE may have more flexibility in increasing a PSD for uplink transmission.

FIG.6is a diagram illustrating an example600of a sub-PRB communication, in accordance with various aspects of the present disclosure.

Example600shows an example of a PRB that is split into a first end and second end. The first end may be a start PRB. The second end may be an end PRB. The diagonal line may represent an example where a PRB may be split. The table in example may represent FDRA Type 1 RIV values that are reinterpreted.

FIG.7is a diagram illustrating an example process700performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process700is an example where the UE (e.g., UE120depicted inFIGS.1-2, UE420depicted inFIG.4) performs operations associated with indicating sub-PRB transmission with an FDRA field.

As shown inFIG.7, in some aspects, process700may include receiving an FDRA field in DCI for a transport block that is sized over multiple repetitions (block710). For example, the UE (e.g., using reception component902depicted inFIG.9) may receive an FDRA field in DCI for a transport block that is sized over multiple repetitions, as described above.

As further shown inFIG.7, in some aspects, process700may include reinterpreting bits in the FDRA field, which indicate an allocated quantity of PRBs greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication (block720). For example, the UE (e.g., using determination component908depicted inFIG.9) may reinterpret bits in the FDRA field, which indicate an allocated quantity of PRBs greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication, as described above.

As further shown inFIG.7, in some aspects, process700may include transmitting the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field (block730). For example, the UE (e.g., using transmission component904depicted inFIG.9) may transmit the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field, as described above.

With respect to process700, in a first aspect, the FDRA field is FDRA Type 1. In a second aspect, alone or in combination with the first aspect, the bits in the FDRA field include bits indicating an SLIV of PRBs.

With respect to process700, in a third aspect, the FDRA field is FDRA Type 0. In a fourth aspect, alone or in combination with the third aspect, the bits in the FDRA field include a bitmap indicating a quantity of RBGs.

With respect to process700, in a fifth aspect, alone or in combination with one or more of the first through fourth aspects, process700includes determining that the sub-PRB communication is a start PRB based at least in part on a determination that an allocated length of the PRB does not satisfy a length threshold.

With respect to process700, in a sixth aspect, alone or in combination with one or more of the first through fifth aspects, process700includes determining that the sub-PRB communication is an end PRB based at least in part on a determination that an allocated length of the PRB satisfies a length threshold.

With respect to process700, in a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process700includes determining whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a BWP within which the sub-PRB communication is transmitted.

With respect to process700, in an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the reinterpreting of the bits in the FDRA field is based at least in part on a product of a quantity of the multiple repetitions and a bandwidth of a physical uplink shared channel for the sub-PRB communication satisfying a threshold.

With respect to process700, in a ninth aspect, alone or in combination with one or more of the first through eighth aspects, process700includes reinterpreting one or more bits in an MCS field in the DCI to indicate whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB. In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the one or more bits in the MCS field include a most significant bit in the MCS field. In an eleventh aspect, alone or in combination with one or more of the first through ninth aspects, process700includes determining whether the sub-PRB communication is a start PRB or an end PRB based at least in part on one or more bits in an MCS field in the DCI.

FIG.8is a diagram illustrating an example process800performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process800is an example where the base station (e.g., base station110) performs operations associated with indicating sub-PRB transmission with an FDRA

FIELD

As shown inFIG.8, in some aspects, process800may include generating bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication (block810). For example, the base station (e.g., using generation component1008depicted inFIG.10) may generate bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication, as described above.

As further shown inFIG.8, in some aspects, process800may include transmitting, to the UE, the bits in the FDRA field in DCI (block820). For example, the base station (e.g., using transmission component1004depicted inFIG.10) may transmit, to the UE, the bits in the FDRA field in DCI, as described above.

As further shown inFIG.8, in some aspects, process800may include receiving, from the UE, the sub-PRB communication (block830). For example, the base station (e.g., using reception component1002depicted inFIG.10) may receive, from the UE, the sub-PRB communication, as described above.

With respect to process800, in a first aspect, the FDRA field is FDRA Type 1. In a second aspect, alone or in combination with the first aspect, the bits in the FDRA field include bits indicating a start and length indicator value of PRBs.

With respect to process800, in a third aspect, the FDRA field is FDRA Type 0. In a fourth aspect, alone or in combination with the third aspect, the bits in the FDRA field include a bitmap indicating a quantity of RGBs.

With respect to process800, in a fifth aspect, alone or in combination with one or more of the first through fourth aspects, process800includes receiving a start PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that does not satisfy a length threshold.

With respect to process800, in a sixth aspect, alone or in combination with one or more of the first through fifth aspects, process800includes receiving an end PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that satisfies a length threshold.

With respect to process800, in a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process800includes indicating, via an allocated length of a PRB and an indicated quantity of PRBs in the bits in the FDRA field, whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a BWP within which the sub-PRB communication is transmitted.

With respect to process800, in an eighth aspect, alone or in combination with one or more of the first through seventh aspects, receiving the sub-PRB communication includes receiving the sub-PRB communication as a start PRB or an end PRB based at least in part on indicating a value of one or more bits (e.g., most significant bit) in an MCS field in the DCI. In a ninth aspect, alone or in combination with one or more of the first through seventh aspects, receiving the sub-PRB communication includes receiving the sub-PRB communication as a start PRB or an end PRB based at least in part on indicating a value of one or more bits (e.g., most significant bit) in an MCS field in the DCI.

The reception component902may receive an FDRA field in DCI for a transport block that is sized over multiple repetitions. The determination component908may reinterpret bits in the FDRA field, which indicate an allocated quantity of PRBs greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication. The transmission component904may transmit the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field.

The determination component908may determine that the sub-PRB communication is a start PRB based at least in part on a determination that an allocated length of the PRB does not satisfy a length threshold.

The determination component908may determine that the sub-PRB communication is an end PRB based at least in part on a determination that an allocated length of the PRB satisfies a length threshold.

The determination component908may determine whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a BWP within which the sub-PRB communication is transmitted.

The determination component908may reinterpret a bit in an MCS field in the DCI to indicate that the PRB for uplink transmission is a sub-PRB communication.

The determination component908may determine whether the sub-PRB communication is a start PRB or an end PRB based at least in part on the bit in a modulation and coding scheme field.

The generation component1008may generate bits for an FDRA field that are to be reinterpreted by a UE for transmitting a sub-PRB communication. The transmission component1004may transmit, to the UE, the bits in the FDRA field in DCI. The reception component1002may receive, from the UE, the sub-PRB communication.

The reception component1002may receive a start PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that does not satisfy a length threshold.

The reception component1002may receive an end PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that satisfies a length threshold.

The generation component1008may indicate, via an allocated length of a PRB and an indicated quantity of PRBs in the bits in the FDRA field, whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a BWP within which the sub-PRB communication is transmitted.

Implementation examples are described in the following numbered aspects:

Aspect 1: A method of wireless communication performed by a user equipment, comprising receiving a frequency domain resource allocation (FDRA) field in downlink control information (DCI) for a transport block that is sized over multiple repetitions; reinterpreting bits in the FDRA field, which indicate an allocated quantity of physical resource blocks (PRBs) greater than an allocation threshold, to determine that a PRB of the transport block for uplink transmission is a sub-PRB communication; and transmitting the sub-PRB communication based at least in part on reinterpreting the bits in the FDRA field.

Aspect 2: The method of Aspect 1, wherein the FDRA field is FDRA type 1.

Aspect 3: The method of Aspect 1, wherein the bits in the FDRA field include bits indicating a start and length indicator value of PRBs.

Aspect 4: The method of Aspect 1, wherein the FDRA field is FDRA type 0.

Aspect 5: The method of Aspect 1, wherein the bits in the FDRA field include a bitmap indicating a quantity of resource block groups.

Aspect 6: The method of any of Aspects 1-5, further comprising determining that the sub-PRB communication is a start PRB based at least in part on a determination that an allocated length of the PRB does not satisfy a length threshold.

Aspect 7: The method of any of Aspects 1-6, further comprising determining that the sub-PRB communication is an end PRB based at least in part on a determination that an allocated length of the PRB satisfies a length threshold.

Aspect 8: The method of any of Aspects 1-7, further comprising determining whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a bandwidth part within which the sub-PRB communication is transmitted.

Aspect 9: The method of any of Aspects 1-8, wherein the reinterpreting of the bits in the FDRA field is based at least in part on a product of a quantity of the multiple repetitions and a bandwidth of a physical uplink shared channel for the sub-PRB communication satisfying a threshold.

Aspect 10: The method of any of Aspects 1-9, further comprising reinterpreting one or more bits in a modulation and coding scheme (MCS) field in the DCI to indicate whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB.

Aspect 11: The method of Aspect 10, wherein the one or more bits in the MCS field include a most significant bit.

Aspect 12: The method of any of Aspects 1-9, further comprising determining whether the sub-PRB communication is a start PRB or an end PRB based at least in part on the bit in a modulation and coding scheme field in the DCI.

Aspect 13: A method of wireless communication performed by a base station, comprising generating bits for a frequency domain resource allocation (FDRA) field that are to be reinterpreted by a user equipment for transmitting a sub-physical resource block (sub-PRB) communication; transmitting, to the user equipment, the bits in the FDRA field in downlink control information (DCI); and receiving, from the user equipment, the sub-PRB communication.

Aspect 14: The method of Aspect 13, wherein the FDRA field is FDRA type 1.

Aspect 15: The method of Aspect 13, wherein the bits in the FDRA field include bits indicating a start and length indicator value of PRBs.

Aspect 16: The method of Aspect 13, wherein the FDRA field is FDRA type 0.

Aspect 17: The method of Aspect 13, wherein the bits in the FDRA field include a bitmap indicating a quantity of resource block groups.

Aspect 18: The method of any of Aspects 13-17, further comprising receiving a start PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that does not satisfy a length threshold.

Aspect 19: The method of any of Aspects 13-18, further comprising receiving an end PRB for the sub-PRB communication based at least in part on indicating, in the FDRA field, an allocated length of the PRB that satisfies a length threshold.

Aspect 20: The method of any of Aspects 13-19, further comprising indicating, via an allocated length of a PRB and an indicated quantity of PRBs in the bits in the FDRA field, whether the sub-PRB communication is a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB, based at least in part on one or more of an indicated quantity of PRBs, a threshold quantity of PRBs, a length of PRBs, or a quantity of PRBs of a bandwidth part within which the sub-PRB communication is transmitted.

Aspect 21: The method of any of Aspects 13-20, wherein receiving the sub-PRB communication includes receiving the sub-PRB communication as a first half of a PRB, a second half of a PRB, or a particular combination of one or more portions of a PRB based at least in part on indicating a value of one or more bits in a modulation and coding scheme field in the DCI.

Aspect 22: The method of any of Aspects 13-20, wherein receiving the sub-PRB communication includes receiving the sub-PRB communication as a start PRB or an end PRB based at least in part on indicating a value of one or more bits in a modulation and coding scheme in the DCI.

Aspect 24: A non-transitory computer-readable medium storing one or more instructions for wireless communication at a UE, the one or more instructions executable by a processor to perform a method of any of Aspects 1 through 12.

Aspect 25: An apparatus for wireless communication at a UE, comprising at least one means for performing a method of any Aspects 1 through 12.

Aspect 27: A non-transitory computer-readable medium storing one or more instructions for wireless communication at a base station, the one or more instructions executable by a processor to perform a method of any of Aspects 13 through 22.

Aspect 28: An apparatus for wireless communication at a base station, comprising at least one means for performing a method of any Aspects 13 through 22.

As used herein, the term “component” is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and/or a combination of hardware and software. It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware, firmware, and/or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods were described herein without reference to specific software code—it being understood that software and hardware can be designed to implement the systems and/or methods based, at least in part, on the description herein.