Techniques for demodulation reference signal bundling for configured uplink channels

Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may be configured to transmit two or more consecutive transmissions that may be used for demodulation reference signal (DMRS) bundling. If criteria for DMRS bundling are not satisfied, the UE may generate dummy data to transmit during the skipped configured grant occasion, and may maintain phase continuity across the skipped configured grant occasion and any other PUSCHs in a set of uplink transmissions. In some examples, the UE may deprioritize DMRS bundling for sets of PUSCHs during which a PUSCH is to be skipped. If criteria for DMRS bundling are not satisfied, the UE may not maintain phase continuity across the set of PUSCHs, and may refrain from transmitting any data during the CG-PUSCH occasion.

FIELD OF TECHNOLOGY

The following relates to wireless communications, including techniques for demodulation reference signal bundling for configured uplink channels.

BACKGROUND

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for demodulation reference signal bundling for configured uplink channels. Generally, a user equipment (UE) may maintain phase continuity across different transmission opportunities to enable demodulation reference signal (DMRS) bundling. In some cases, a UE may skip physical uplink shared channel (PUSCH) transmission opportunities for configured grants. For example, the UE may be configured to transmit two or more consecutive transmissions (e.g., a set of two or more configured grant PUSCHs (CG-PUSCHs), or dynamic grant PUSCHs (DG-PUSCHs) and CG-PUSCHs), and may determine that one or more criteria for transmitting during the CG-PUSCH are not satisfied (e.g., may determine that the UE does not have enough buffered data to transmit during one of the CG-PUSCH occasions). In some examples, the UE may generate dummy data (e.g., filler data) for a packet data unit (PDU) to transmit during the skipped CG-PUSCH occasion, and may maintain phase continuity across the skipped CG-PUSCH occasion and any other PUSCHs in the set (e.g., during a DMRS bundling interval).

In some examples, the UE may deprioritize DMRS bundling for sets of PUSCHs during which a PUSCH is to be skipped (e.g., despite DMRS bundling being enabled). For example, in a set of PUSCHs, if a CG-PUSCH occasion is adjacent to one or more scheduled PUSCHs (e.g., another CG-PUSCH occasion, a DG-PUSCH, etc.), then if one or more conditions are satisfied, the UE may support DMRS bundling for the set of PUSCHs. However, if one or more criteria are not satisfied (e.g., the UE may determine that the UE does not have enough buffered data to transmit during one of the CG-PUSCH occasions), then the UE may not maintain phase continuity across the set of PUSCHs, and may refrain from transmitting any data during the CG-PUSCH occasion.

A method for wireless communications at a user equipment (UE) is described. The method may include receiving, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, generating dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion, and transmitting, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

An apparatus for wireless communications at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, generate dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion, and transmit, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

Another apparatus for wireless communications at a UE is described. The apparatus may include means for receiving, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, means for generating dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion, and means for transmitting, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to receive, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, generate dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion, and transmit, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, control signaling instructing the UE to maintain the phase continuity across a set of multiple uplink channels including the first uplink channel and the second uplink channel.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for generating the dummy data for the first uplink channel may be based on receiving the control signaling instructing the UE to maintain the phase continuity across the set of multiple uplink channels.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel may be based on receiving the dynamic grant.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel may be based on receiving the second configured grant.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first configured grant includes a first instance of a first set of configured grant resources and the second configured grant includes a second instance of the first set of configured grant resources and the first configured grant includes an instance of a first set of configured grant resources and the second configured grant includes an instance of a second set of configured grant resources.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a quantity of data in a buffer for transmission to the base station fails to satisfy a threshold, where the configured grant failing to satisfy the transmission criterion and transmitting the dummy data may be based on the determining.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, one or more of parameters used to maintain the phase continuity includes a phase value of the first uplink channel and the second uplink channel, a radio frequency band used by the first uplink channel and the second uplink channel, a transmission power of the first uplink channel and the second uplink channel, one or more antenna ports used for transmitting the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals, a precoding scheme of the first uplink channel and the second uplink channel, or any combination thereof.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for maintaining the phase continuity across the first time slot and the second time slot using a demodulation reference signal bundling procedure that supports joint channel estimation at the base station, where the transmitting may be based on maintaining the phase continuity.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first uplink channel includes a physical uplink shared channel and the second uplink channel includes a physical uplink shared channel.

A method for wireless communications at a base station is described. The method may include transmitting, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, receiving, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity, performing channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity, and decoding the second uplink channel based on the channel estimation.

An apparatus for wireless communications at a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, receive, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity, perform channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity, and decode the second uplink channel based on the channel estimation.

Another apparatus for wireless communications at a base station is described. The apparatus may include means for transmitting, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, means for receiving, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity, means for performing channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity, and means for decoding the second uplink channel based on the channel estimation.

A non-transitory computer-readable medium storing code for wireless communications at a base station is described. The code may include instructions executable by a processor to transmit, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel, receive, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity, perform channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity, and decode the second uplink channel based on the channel estimation.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, control signaling instructing the UE to maintain the phase continuity across a set of multiple uplink channels including the first uplink channel and the second uplink channel.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving the dummy data in the first uplink channel may be based on transmitting the control signaling instructing the UE to maintain the phase continuity across the set of multiple uplink channels.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel may be based on transmitting the dynamic grant.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel may be based on transmitting the second configured grant.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving the dummy data may be based on the configured grant failing to satisfy a transmission criterion for the UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, one or more parameters used to receive the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having the phase continuity includes a phase value of the first uplink channel and the second uplink channel, a radio frequency band used by the first uplink channel and the second uplink channel, a resource block used by the first uplink channel and the second uplink channel, a transmission power of the first uplink channel and the second uplink channel, one or more antenna ports used for receiving the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals, a precoding scheme of the first uplink channel and the second uplink channel, or any combination thereof.

A method for wireless communications a UE is described. The method may include receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, receiving, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, suppressing a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion, and transmitting, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

An apparatus for wireless communications a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, receive, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, suppress a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion, and transmit, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

Another apparatus for wireless communications a UE is described. The apparatus may include means for receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, means for receiving, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, means for suppressing a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion, and means for transmitting, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

A non-transitory computer-readable medium storing code for wireless communications a UE is described. The code may include instructions executable by a processor to receive, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, receive, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, suppress a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion, and transmit, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel may be based on receiving the dynamic grant.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel may be based on receiving the configured grant.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first configured grant includes a first instance of a first set of configured grant resources and the second configured grant includes a second instance of the first set of configured grant resources and the first configured grant includes an instance of a first set of configured grant resources and the second configured grant includes an instance of a second set of configured grant resources.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a quantity of data in a buffer for transmission to the base station failing to satisfy a threshold, where the configured grant failing to satisfy the transmission criterion and transmitting the dummy data may be based on the determining.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting, based on the suppressing, a first set of parameters for transmitting the first set of multiple demodulation reference signals and selecting, based on the suppressing, a second set of parameters for transmitting the second set of multiple demodulation reference signals, where the second set of parameters may be different from the first set of parameters.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first set of parameters includes a phase value of the first uplink channel, a radio frequency band used by the first uplink channel, a transmission power of the first uplink channel, one or more antenna ports used for transmitting the first set of multiple demodulation reference signals, a precoding scheme of the first uplink channel, or any combination thereof and the second set of parameters includes a phase value of the second uplink channel, a radio frequency band used by the second uplink channel, a transmission power of the second uplink channel, one or more antenna ports used for transmitting the second set of multiple demodulation reference signals, a precoding scheme of the second uplink channel, or any combination thereof.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first uplink channel includes a physical uplink shared channel or a physical uplink control channel and the second uplink channel includes a physical uplink shared channel or a physical uplink control channel.

A method for wireless communications at a base station is described. The method may include transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, transmitting, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, monitor for the first uplink channel during the first time slot and the second uplink channel during the second time slot, and receive, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

An apparatus for wireless communications at a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, transmit, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, monitor for the first uplink channel during the first time slot and the second uplink channel during the second time slot, and receive, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

Another apparatus for wireless communications at a base station is described. The apparatus may include means for transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, means for transmitting, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, means for monitor for the first uplink channel during the first time slot and the second uplink channel during the second time slot, and means for receive, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

A non-transitory computer-readable medium storing code for wireless communications at a base station is described. The code may include instructions executable by a processor to transmit, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel, transmit, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel, monitor for the first uplink channel during the first time slot and the second uplink channel during the second time slot, and receive, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel may be based on transmitting the dynamic grant.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel may be based on transmitting the configured grant.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for refraining from performing a channel estimation for the first uplink channel and the second uplink channel based on failing to receive the first uplink channel and the second set of multiple demodulation reference signals failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving the first set of multiple demodulation reference signals according to a first set of parameters based on the monitoring and the first set of multiple demodulation reference signals failing to maintain phase continuity with the first set of multiple demodulation reference signals and receiving the second set of multiple demodulation reference signals according to a second set of parameters based on the monitoring and the second set of multiple demodulation reference signals failing to maintain phase continuity with the first set of multiple demodulation reference signals.

DETAILED DESCRIPTION

A wireless communications system, a UE may be configured to transmit uplink signaling via different types of physical uplink shared channels (PUSCHs), such as dynamic grant physical uplink shared channels (DG-PUSCH) or configured grant PUSCHs (CG-PUSCHs). In cases where uplink signaling is scheduled via dynamic grants (e.g., for a DG-PUSCH), a base station may transmit a downlink control information (DCI) message including an uplink grant of resources on the PUSCH, and the UE may transmit an uplink message in the granted resources. In cases where uplink signaling is scheduled via a configured grant (e.g., for a CG-PUSCH), the base station may configure one or more (e.g., periodic) CG-PUSCH occasions in which the UE may select to transmit pending uplink data that satisfies one or more criteria associated with the CG-PUSCH occasion. However, in some cases, the UE may not have any data to transmit during a particular CG-PUSCH resource. In such examples, PUSCH skipping may be supported, and the UE may not generate a packet data unit (PDU), and may not transmit any uplink data signaling during the GC-PUSCH occasion. Such operations may improve power consumption of the UE and reduce interference with other nodes in a wireless communications system.

A wireless communications system may support demodulation reference signal (DMRS) bundling. DMRS bundling may allow a receiving device (e.g., a base station) to use DMRSs from multiple transmission time intervals (TTIs) (e.g., slots, symbols, mini-slots, transport blocks, or the like) to perform channel estimation for the related TTIs. Thus, a joint channel estimation (e.g., across multiple transmission occasions, such as multiple TTIs, multiple slots, and/or multiple transport blocks carrying different information) may be more robust and more accurate than a channel estimation for a single TTI (e.g., single slot). To support DMRS bundling, a UE may maintain phase continuity across respective transmissions (e.g., different transport blocks (TBs)). Maintaining phase continuity may be referred to as bundling and may include using a same set of parameters for transmitting multiple TBs (e.g., a same frequency resource, transmit power, spatial transmit relation, antenna ports, precoding, or the like). Bundling one or more respective sets of transmissions may support joint processing of DMRSs at a receiving base station (or other receiving device, such as a receiving UE in a sidelink communication). However, if a UE skips a PUSCH transmission, then that skipped PUSCH transmissions may leave a gap in a set of two or more (e.g., consecutive) slots in which DMRS bundling could otherwise be performed. That is, if a UE refrains from transmitting an uplink transmission during a slot that could otherwise be bundled with one or more adjacent slots, then the UE may not be able to maintain phase continuity across the set of slots.

In some examples, a UE may maintain phase continuity and perform DMRS bundling when skipping PUSCH transmissions for configured grants (e.g., CG-PUSCHs). For example, the UE may be configured to transmit two or more consecutive transmissions (e.g., a set of two or more CG-PUSCHs, or DG-PUSCHs and CG-PUSCHs), and may determine that one or more criteria are not satisfied (e.g., may determine that the UE does not have enough buffered data to transmit during one of the CG-PUSCH occasions). In some cases, the UE may generate dummy data (e.g., filler data) for a PDU to transmit during the skipped CG-PUSCH occasion. The dummy data may include one or more DMRSs used for DMRS bundling and the UE may maintain phase continuity across the skipped CG-PUSCH occasion and any other PDSCHs in the set (e.g., during a DMRS bundling interval).

In some examples, the UE may deprioritize DMRS bundling for sets of PUSCHs during which a PUSCH is to be skipped (e.g., despite DMRS bundling being enabled). For example, in a set of PUSCHs, if a CG-PUSCH occasion is adjacent to one or more scheduled PUSCHs (e.g., another CG-PUSCH occasion, a DG-PUSCH, etc.), then assuming one or more conditions are satisfied, the UE may support DMRS bundling for the set of PUSCHs. However, if one or more criteria are not satisfied (e.g., the UE may determine that the UE does not have enough buffered data to transmit during one of the CG-PUSCH occasions), then the UE may not maintain phase continuity across the set of PUSCHs, and may refrain from transmitting any data during the CG-PUSCH occasion.

Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to resource configurations, timelines, and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for demodulation reference signal bundling for configured uplink channels.

FIG.1illustrates an example of a wireless communications system100that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The wireless communications system100may include one or more base stations105, one or more UEs115, and a core network130. In some examples, the wireless communications system100may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communications system100may support enhanced broadband communications, ultra-reliable communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

The wireless communications system100may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system100may be configured to support ultra-reliable low-latency communications (URLLC). The UEs115may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more ultra-reliable, low-latency such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and ultra-reliable, low-latency services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

The wireless communications system100may support DMRS bundling. To support DMRS bundling, the transmitting device (e.g., the UE115) may maintain phase continuity across multiple transmission occasions (e.g., transport blocks or TTIs) and the receiving device (e.g., the base station105) may jointly process the multiple transmission occasions and perform channel estimation using DMRSs transmitted over the multiple transmission occasions (e.g., transport blocks or TTIs). In some examples, a UE115may maintain phase continuity and perform DMRS bundling when skipping PUSCH transmissions for configured grants (e.g., CG-PUSCHs). For example, the UE115may be configured to transmit two or more consecutive transmissions (e.g., a set of two or more CG-PUSCHs, or DG-PUSCHs and CG-PUSCHs), and may determine that one or more criteria are not satisfied (e.g., may determine that the UE115does not have enough buffered data to transmit during one of the CG-PUSCH occasions). The UE115may generate dummy data (e.g., filler data) for a PDU to transmit during the skipped CG-PUSCH occasion, and may maintain phase continuity across the skipped CG-PUSCH occasion and any other PDSCHs in the set (e.g., during a DMRS bundling interval).

In some examples, the UE115may deprioritize DMRS bundling for sets of PUSCHs during which a PUSCH is to be skipped (e.g., despite DMRS bundling being enabled). For example, in a set of PUSCHs, if a CG-PUSCH occasion is adjacent to one or more scheduled PUSCHs (e.g., another CG-PUSCH occasion, a DG-PUSCH, etc.), then assuming one or more conditions are satisfied, the UE may support DMRS bundling for the set of PUSCHs. However, if one or more criteria are not satisfied (e.g., the UE115may determine that the UE115does not have enough buffered data to transmit during one of the CG-PUSCH occasions), then the UE115may not maintain phase continuity across the set of PUSCHs, and may refrain from transmitting any data during the CG-PUSCH occasion.

FIG.2illustrates an example of a resource configuration200that supports capability signaling for uplink transmissions in accordance with aspects of the present disclosure. In some examples, resource configuration200may implement, or be implemented by, aspects of wireless communications system100. The resource configuration200illustrates a set of resources205across multiple slots210which may be used for transmission/reception of phase-coherent DMRSs. Although illustrated with reference to slots210, techniques described with reference toFIG.2elsewhere herein, may also be performed for any transmission occasion (such as a TTI, transmission opportunity, TB, slots, a mini-slots, sub-slots, symbols, frames, subframes, or the like) in which DMRSs are transmitted, and such terms may be used interchangeably in some cases. Additionally, although the resource configuration200includes PUSCH transmissions215, techniques described herein may also be performed with reference to a physical uplink control channel (PUCCH).

Some wireless communications systems (e.g., wireless communications system100) may enable DMRS bundling and joint channel estimation across transmission occasions that are sending dissimilar information. Wireless devices (e.g., UEs115) to transmit DMRSs220having phase continuity (e.g., phase-coherent DMRSs220) with other DMRSs to improve channel estimation by the receiving device (e.g., base stations105). For example, a UE115may transmit DMRSs220across two more slots (or transmission occasions) having phase continuity to a base station105within a set of resources (e.g., which are known by both the UE115and the base station105). In this example, because the DMRSs220having phase continuity are received by the base station105within a set of known resources, the base station105may be configured to aggregate the DMRSs220having phase continuity to determine a more accurate channel estimation of the channel between the UE115and the base station105. The base station105may be configured to use the improved channel estimation to demodulate (e.g., decode) other transmissions (e.g., PUSCH transmissions215) received from the UE115via the channel. In some aspects, the PUSCH transmissions215may also be transmitted with phase continuity across the respective slots210.

Some wireless communications systems have enabled DMRSs220to be bundled within a single TTI, but not across multiple TTIs. For example, in some wireless communications systems, a UE115may be configured to transmit a set of DMRSs220having phase continuity within the first slot210-a, but may be unable to maintain phase coherency for DMRSs220transmitted in different slots210(e.g., second slot210-bor third slot210-c). For instance, in some wireless communications systems, a UE115may be unable to maintain phase continuity across DMRSs220which are transmitted within the first slot210-aand the second slot210-b. In this regard, phase continuity may be maintained for DMRSs220within each respective slot210, but may not be maintained for DMRSs220across multiple slots210.

In some other wireless communications systems (e.g., wireless communications system100), DMRSs220may be bundled across multiple slots and/or across multiple transmissions (e.g., PUCCH or PUSCH transmissions), such that phase continuity may be maintained across multiple slots210and/or across the multiple transmissions. For example, in the wireless communications system100, a UE115may be configured to transmit a DMRSs220within the first slot210-a, the second slot210-b, and the third slot210-c, where phase continuity is maintained across each of the slots210-a,210-b, and210-c. In this example, a base station105may be configured to jointly process (e.g., aggregate) the phase-coherent DMRSs220received across the slots210-a,210-b, and210-cwhen performing channel estimation (e.g., which may be referred to as joint channel estimation, or cross-slot channel estimation, or the like), and may use a determined channel estimate to demodulate the PUSCH transmissions215(e.g., PUSCH transmissions215having phase continuity) received across the slots210-a,210-b, and210-c.

In some aspects, one or more parameters or characteristics may be maintained for phase-coherent DMRSs220(e.g., to maintain phase continuity between DMRSs in different transmission occasions, such as slots), which are bundled across one or more slots210. Parameters which may be used to maintain phase continuity for DMRSs220associated with one or more PUSCH transmissions215may include, but are not limited to, phase, frequency allocations, transmission powers, spatial transmission relations, antenna ports used for transmission, precoding schemes, and the like. For example, as illustrated inFIG.2, in cases where DMRSs220are bundled across the first slot210-a, the second slot210-b, and the third slot210-c, the frequency allocation and transmit for the DMRSs220within each respective slot210may remain the same. Conversely, phase-continuity may not be maintained across slots210and/or other transmissions (e.g., phase discontinuity) in cases where DMRSs220in respective slots210exhibit one or more different parameters (e.g., different phases, different frequency resource allocations within or between PUSCH slots, non-contiguous time resource allocation of PUSCH slots, different transmit powers, different antenna ports, different transmission powers, different timing advances).

In some aspects, the ability to bundle DMRSs220across multiple slots210(e.g., maintain phase coherency for DMRSs220across multiple slots210) and/or across multiple transmissions (e.g., multiple PUSCH transmissions215) may enable improved channel estimation at a receiving device (e.g., base station105). In particular, by enabling for larger quantities of DMRSs220to be aggregated across multiple slots210, a base station105may be able to determine a more comprehensive channel estimation (e.g., cross-slot channel estimation), which may improve an ability of the base station105to demodulate received PUSCH transmissions215.

In some examples of a wireless communications system, a UE may be configured to transmit uplink signaling (e.g., PUSCH transmissions215) via dynamic grants (e.g., DG-PUSCHs) or configured grants (CG-PUSCHs). In cases where uplink signaling is scheduled via a dynamic grant, a base station may transmit a downlink control information (DCI) message including an uplink grant of resources on the PUSCH, and the UE may transmit an uplink message in the granted resources. In cases where uplink signaling is scheduled via a CG-PUSCH, the base station may configure one or more (e.g., periodic) CG-PUSCH occasions in which the UE may transmit any pending uplink data. Thus, during each CG-PUSCH resource, the UE may transmit any buffered data. However, in some cases, the UE may not have any data to transmit during a particular CG-PUSCH resource. In such examples, PUSCH skipping may be supported, and the UE may not generate a packet data unit (PDU), and may not transmit any uplink data signaling during the GC-PUSCH occasion.

In some examples, a wireless communications system may support DMRS bundling. DMRS bundling may allow a receiving device (e.g., a base station) to use DMRSs from multiple TTIs (e.g., slots, symbols, mini-slots, or the like) to perform channel estimation. Thus, a joint channel estimation (e.g., across multiple slots) may be more robust and more accurate than a channel estimation for a single slot. To support DMRS bundling possible, a UE may maintain phase continuity across respective transmissions (e.g., different TBs). Maintaining phase continuity may be referred to as bundling and may include using a same set of parameters for transmitting multiple TBs (e.g., a same frequency resource, transmit power, spatial transmit relation, antenna ports, precoding, or the like). Bundling one or more respective sets of transmissions may support joint processing of DMRSs at a receiving base station. However, if a UE skips a PUSCH transmission, then that skipped PUSCH transmissions may leave a gap in a set of two or more (e.g., consecutive) slots in which DMRS bundling could otherwise be performed. That is, if a UE refrains from transmitting an uplink transmission during a slot that could otherwise be bundled with one or more adjacent slots, then the UE may not be able to maintain phase continuity across the set of slots.

In some examples, as described in greater detail with reference toFIGS.3and5, a UE may maintain phase continuity and perform DMRS bundling when skipping PUSCH transmissions for configured grants (e.g., for CG-PUSCHs). For example, the UE may be configured to transmit two or more consecutive transmissions (e.g., a set of two or more CG-PUSCHs, or DG-PUSCHs and CG-PUSCHs), and may determine that one or more criteria are not satisfied (e.g., may determine that the UE does not have enough buffered data to transmit during one of the CG-PUSCH occasions). The UE may generate dummy data (e.g., filler data) for a PDU to transmit during the skipped CG-PUSCH occasion, and may maintain phase continuity across the skipped CG-PUSCH occasion and any other PDSCHs in the set (e.g., during a DMRS bundling interval).

In some examples, as described in greater detail with reference toFIGS.4and6, the UE may deprioritize DMRS bundling for sets of PUSCHs during which a PUSCH is to be skipped (e.g., despite DMRS bundling being enabled or used). For example, in a set of PUSCHs, if a CG-PUSCH occasion is adjacent to one or more scheduled PUSCHs (e.g., another CG-PUSCH occasion, a DG-PUSCH, etc.), then assuming one or more conditions are satisfied, the UE may be support DMRS bundling for the set of PUSCHs. However, if one or more criteria are not satisfied (e.g., the UE115may determine that the UE does not have enough buffered data to transmit during one of the CG-PUSCH occasions), then the UE115may not maintain phase continuity across the set of PUSCHs, and may refrain from transmitting any data during the CG-PUSCH occasion.

FIG.3illustrates an example of a timeline300that supports techniques for demodulation reference signal bundling for configured and dynamic uplink channels in accordance with aspects of the present disclosure. Timeline300may be implemented by one or more wireless devices, such as a UE or a base station, which may be examples of corresponding devices described with reference to wireless communications system100or resource configuration200.

In some examples, a base station may configure the UE with one or more bundling parameters, such as a bundling intervals (K). A bundle interval may be defined such that a UE may coherently transmit one or more uplink channels (e.g., having different TB s) within the bundle interval subject to one or more phase continuity conditions. That is, if DMRS bundling is enabled, the UE may transmit uplink signaling on physical uplink channels (e.g., PUCCH transmissions or PUSCH transmissions) while maintaining phase continuity within the bundle interval. If the one or more phase continuity conditions are satisfied within a bundle interval, the base station may be configured to perform channel estimation using DMRSs transmitted during different slots of the bund interval. The base station may configure bundling parameters, such as bundle intervals, at a UE via higher layer signaling (e.g., radio resource control (RRC) signaling), dynamic signaling (e.g., DCI signaling), or the UE may implicitly determine bundle intervals and other bundling parameters base on uplink transmission configurations, slot formatting, or the like. Each bundle interval may be the same size (e.g., may have the same value for K). In some examples, as illustrated with reference toFIG.3, the bundle interval may be K=2. The bundle interval may also be any number of TTIs (e.g., 2 slots, 4 slots, 8, slots, 16 slots, or any other value), or may vary based on a number of available uplink TTIs (e.g., uplink slots) in a slot format.

The base station may also configure the UE with resource allocation information. For example, the UE may be configured with a time-division multiplexing (TDM) configuration, where each TTI is allocated as an uplink TTI (e.g., U), a downlink TTI (e.g., D), or a special (e.g., flexible) TTI (e.g., S). Some or all symbols in an S TTI may be allocated for uplink signaling, and some or all symbols in the S TTI may be allocated for downlink signaling. In some examples, a TDM resource allocation may include a pattern of U, D, and S TTIs. An illustrative example pattern may be: DDSUUDDSUU. Such a pattern may repeat itself over time (e.g., across various TTIs).

In some examples, the UE may support DMRS bundling across CG-PUSCH transmissions and DG-PUSCH transmissions. For example, the base station may configure the UE with one or more CG-PUSCHs. The base station may transmit, to the UE, configuration information (e.g., via control signaling) indicating one or more CG-PUSCH occasions (e.g., CG-PUSCH occasions315). In some examples, the base station may further configure the UE with one or more dynamic grants (e.g., for DG-PUSCHs). For example, the base station may transmit an uplink grant305-aduring slot1(e.g., a D slot). The uplink grant may indicate uplink resources in a subsequent U slot (e.g., slot4). The indicated uplink resources may be adjacent to a slot that is configured for uplink signaling via configured grants (e.g., may be adjacent to slot3in which a CG-PUSCH occasion315-ais located). In some examples, additional signaling may convey that the dynamic grant PUSCH may be or is configured to be bundled with a subsequent CG-PUSCH (e.g., CG-PUSCH occasion315-a). For instance, the base station may transmit an indication to the UE that DMRS bundling (e.g., joint channel estimation) is enabled. In such examples, the UE may identify data for transmission on the CG-PUSCH occasion315-ain slot3, and my also transmit uplink data in slot4according to the uplink grant305-a. The UE may set one or more parameter values (e.g., transmit power, antenna port selection, precoding selection, frequency resources, or the like) such that basic requirements for DMRS bundling are satisfied. In such examples, the UE may further transmit one or more DMRSs in each of slot3and slot4while maintaining phase continuity for joint channel estimation at the receiving base station.

In some examples, the UE may transmit dummy data during a CG-PUSCH occasion315while maintaining phase continuity with an adjacent DG-PUSCH to perform DMRS bundling when it does not have enough pending data to transmit during the CG-PUSCH occasion315. Implicit DMRS bundling techniques may prove difficult because the UE may not be able to plan ahead (e.g., the UE may not be able to determine whether it will skip a CG-PUSCH occasion within a threshold amount of time prior to the CG-PUSCH occasion). If DMRS bundling is enabled, supported, or used, then the UE may determine that one or more conditions are satisfied. For instance, the UE may determine that it does not have data to transmit during CG-PUSCH occasion315-b, and that an uplink grant305-b(e.g., received during slot6) has scheduled uplink data for transmission in slot9. In such examples, if DMRS bundling is enabled, then UE behavior for uplink skipping may be suspended. For example, instead of skipping uplink transmissions during the CG-PUSCH occasion315-bin slot8, the UE may generate dummy data for a PDU, and may transmit the dummy data (including the DMRSs associated with the PDU) during the CG-PUSCH occasion315-b. In such examples, the UE may prepare for DMRS bundling as soon as the conditions are met (e.g., in response to the UE determining that there is uplink data dynamically scheduled for slot9, that there is no pending uplink data to be transmitted during the CG-PUSCH occasion315-b, or both). Having generated the dummy data for slot8, the UE may transmit DMRSs and the dummy data during slot8, and DMRSs and the scheduled uplink data during slot9. The UE may maintain phase continuity across slot8and slot9, such that the transmitted DMRSs are bundled.

In some examples, the UE may perform DMRS bundling if no PUSCH skipping is to be performed. For example, if bundling is enabled, UE115may determine whether an actual payload is to be transmitted during a pending CG-PUSCH occasion315. For instance, the UE may determine that it does have uplink data to transmit (e.g., sufficient data in a buffer to satisfy a threshold amount of data) during CG-PUSCH occasion315-cduring slot13. The UE may further receive an uplink grant305-cduring slot11, which may include an indication of uplink resources during slot14for an uplink data transmission. In such examples, if an actual payload is to be transmitted during CG-PUSCH occasion315-c, then the UE may proceed to plan for DMRS bundling. That is, upon determining that uplink data is to be transmitted during slot13, that uplink data is to be transmitted during slot14, or both, the UE may prepare to maintain phase continuity (e.g., for DMRS bundling) across slots13and14. For example, the UE may configure one or more parameters (e.g., may select parameter values for frequency resources, precoding settings, one or more antenna ports, a transmit power, or the like) to be used for transmitting data and DMRSs during the bundle interval (e.g., across slot13and slot14).

In some examples, the UE may deprioritize DMRS bundling when performing PUSCH skipping. For example, if bundling is enabled, UE115may determine whether an actual payload is to be transmitted during a pending CG-PUSCH occasion315. For instance, the UE may determine that it does not have uplink data to transmit (e.g., that there is not sufficient data in a buffer to satisfy a threshold amount of data) during CG-PUSCH occasion315-dduring slot18. The UE may further receive an uplink grant305-dduring slot16, which may include an indication of uplink resources during slot19for an uplink data transmission. In such examples, if no actual payload is to be transmitted during CG-PUSCH occasion315-d, then the UE may refrain from performing DMRS bundling. That is, the UE may drop DMRS bundling around the PUSCH transmission during slot19. Upon determining that uplink data is to be transmitted during slot19, but that no uplink data is to be transmitted during slot18, the UE may not maintain phase continuity (e.g., for DMRS bundling) across slots18and19. For example, the UE may configure one or more parameter values (e.g., may select parameter values for frequency resources, precoding settings, one or more antenna ports, a transmit power, or the like) for transmitting DMRSs during slot18, and a second set of different parameter values for transmitting DMRSs during slot19.

In some examples, the UE may generate dummy data and maintain phase continuity for DMRS bundling (e.g., as described with reference to slots8and9) based on one or more rules, which may be included in one or more standards documents, indicated to the UE by the base station, preconfigured at the UE, or any combination thereof. In some examples, the one or more rules may define the UE behavior based on whether the UE has data to transmit (e.g., in a CG PUSCH occasion315), whether a CG-PUSCH occasion315is located adjacent to one or more U slots in which uplink data is scheduled, or the like. In some examples, the UE may perform DMRS bundling during one or more slots if the UE can determine that the one or more conditions are satisfied within a threshold amount of time of the bundling interval (e.g., the two or more slot in which uplink signaling is scheduled).

In some examples, the UE may deprioritize DMRS bundling (e.g., may refrain from DMRS bundling or maintaining phase continuity for two or more slots as described with reference to slots18and19) based on one or more rules, which may be included in one or more standards documents, indicated to the UE by the base station, preconfigured at the UE, or any combination thereof. In some examples, the one or more rules may define the UE behavior based on whether the UE has data to transmit (e.g., in a CG PUSCH occasion315), whether a CG-PUSCH occasion315is located adjacent to one or more U slots in which uplink data is scheduled, or the like. In some examples, the UE may refrain from DMRS bundling during one or more slots if the UE can determine that the one or more conditions are or are not satisfied within a threshold amount of time of the bundling interval (e.g., the two or more slot in which uplink signaling is scheduled).

In some examples, a bundling interval may span more than two slots. For example,FIG.3is described with reference to scenarios in which two adjacent slots are scheduled for uplink signaling (e.g., via a dynamic grant and a configured grant). However, described techniques may apply to any number of slots in which uplink signaling is described. For instance, a CG-PUSCH occasion315may be located in a set of three or more U slots. For example, a DG-PUSCH may be scheduled prior to or after the CG-PUSCH occasion315, or another CG-PUSCH occasion may be located immediately prior to or immediately after the CG-PUSCH occasion315, or any combination thereof. In such examples, as described herein, the UE may generate dummy data (e.g., as illustrated with reference to slot8) and transmit the scheduled uplink data during the full set of slots, or may deprioritize DMRS bundling, refrain from transmitting during the CG-PUSCH occasion315(e.g., as illustrated with reference to slot18), and refrain from DMRS bundling across the full set of slots that includes the skipped CG-PUSCH occasion315.

In some examples, as described in greater detail with reference toFIG.4, the UE may generate dummy data and perform DMRS bundling in case of PUSCH skipping, or may deprioritize DMRS bundling in case of PUSCH skipping, for multiple adjacent CG-PUSCH occasions315.

FIG.4illustrates an example of a timeline400that supports techniques for demodulation reference signal bundling for configured and dynamic uplink channels in accordance with aspects of the present disclosure. Timeline400may be implemented by one or more wireless devices, such as a UE or a base station, which may be examples of corresponding devices described with reference to wireless communications system100or resource configuration200.

In some examples, a base station may configure the UE with one or more bundling parameters, such as a bundling intervals (K). A bundle interval may be defined such that a UE may coherently transmit one or more uplink channels (e.g., having different TB s) within the bundle interval subject to one or more phase continuity conditions. That is, if the one or more phase continuity conditions are satisfied within a bundle interval, the UE may transmit uplink signaling on physical uplink channels (e.g., PUCCH transmissions or PUSCH transmissions) while maintaining phase continuity within a bundle. The base station may configure bundling parameters, such as bundle intervals, at a UE via higher layer signaling (e.g., radio resource control (RRC) signaling), dynamic signaling (e.g., DCI signaling), or the UE may implicitly determine bundle intervals and other bundling parameters base on uplink transmission configurations, slot formatting, or the like. Each bundle interval may be the same size (e.g., may have the same value for K). In some examples, as illustrated with reference toFIG.3, the bundle interval may be K=2. The bundle interval may also be any number of TTIs (e.g., 2 slots, 4 slots, 8, slots, 16 slots, or any other value), or may vary based on a number of available uplink TTIs (e.g., uplink slots) in a slot format.

The base station may also configure the UE with resource allocation information. For example, the UE may be configured with a time-division multiplexing (TDM) configuration, where each TTI is allocated as an uplink TTI (e.g., U), a downlink TTI (e.g., D), or a special (e.g., flexible) TTI (e.g., S). Some or all symbols in an S TTI may be allocated for uplink signaling, and some or all symbols in the S TTI may be allocated for downlink signaling. In some examples, a TDM resource allocation may include a pattern of U, D, and S TTIs. An illustrative example pattern may be: DDSUUDDSUU. Such a pattern may repeat itself over time (e.g., across various TTIs).

In some examples, the UE may support DMRS bundling across multiple CG-PUSCHs. For example, the base station may configure the UE with one or more CG-PUSCHs. The base station may transmit, to the UE, configuration information (e.g., via control signaling) indicating one or more CG-PUSCH occasions (e.g., CG-PUSCH occasions415). The configuration information may configure one set of CG-PUSCH occasions415(e.g., CG-PUSCH occasion415-a, CG-PUSCH occasion415-b, CG-PUSCH occasion415-c, CG-PUSCH occasion415-d, CG-PUSCH occasion415-e, CG-PUSCH occasion415-f, CG-PUSCH occasion415-g, and CG-PUSCH occasion415-h), or a first set of CG-PUSCH occasions415(e.g., CG-PUSCH occasion415-a, CG-PUSCH occasion415-c, CG-PUSCH occasion415-e, CG-PUSCH occasion415-g) and a second set of CG-PUSCH occasions415(CG-PUSCH occasion415-b, CG-PUSCH occasion415-d, CG-PUSCH occasion415-f, CG-PUSCH occasion415-h). In some examples, additional signaling may convey that multiple CG-PUSCH Occasions415(e.g., adjacent CG-PUSCH occasions415) may be or are configured to be bundled. For instance, the base station may transmit an indication to the UE that DMRS bundling (e.g., joint channel estimation) is enabled.

In some examples, CG-PUSCH occasions415may be part of a same CG-PUSCH configuration, or part of separate CG-PUSCH configurations. For example, a first configured grant may include a first instance (e.g., CG-PUSCH occasion415-a) of a first set of configured grant resources and a second instance (e.g., CG-PUSCH occasion415-b) of the first set of configured grant resources. In some examples, a first configured grant may include a first instance (e.g., CG-PUSCH occasion415-a) of a first set of configured grant resource and a second configured grant may include an instance (e.g., CG-PUSCH occasion415-b) of a second set of configured grant resources. Thus, techniques described herein may apply to CG-PUSCH occasions415that are adjacent or non-adjacent, and may apply to CG-PUSCH occasions415that are part of a same configured grant configuration, or are part of different configured grant configurations.

In cases where DMRS bundling is enabled, the UE may identify data for transmission on the CG-PUSCH occasions415. For instance, the UE may identify data or transmission during slot3, slot4, slot9, slot13, slot14, and slot18. However, the UE may determine that there is no pending data to transmit in some CG-PUSCH occasions (e.g., CG-PUSCH occasions415-c). Where two or more consecutive CG-PUSCH occasions415have data for transmission, the UE may perform DMRS bundling. That is, the UE may set one or more parameter values (e.g., transmit power, antenna port selection, precoding selection, frequency resources, or the like) such that basic requirements for DMRS bundling are satisfied. In such examples, the UE may further transmit one or more DMRSs in each adjacent slot (e.g., slot3and slot4) while maintaining phase continuity for joint channel estimation at the receiving base station.

In some examples, the UE may transmit dummy data during a CG-PUSCH occasion415while maintaining phase continuity with an adjacent CG-PUSCH to perform DMRS bundling when it does not have enough pending data to transmit during the CG-PUSCH occasion415. For instance, the UE may determine that it does not have data to transmit during CG-PUSCH occasion415-c, but that it does have data to transmit during CG-PUSCH occasion415-d. In such examples, if DMRS bundling is enabled, then UE behavior for uplink skipping may be suspended. For example, instead of skipping uplink transmissions during the CG-PUSCH occasion415-din slot9, the UE may generate dummy data for a PDU, and may transmit the dummy data during the CG-PUSCH occasion415-d. In such examples, the UE may prepare for DMRS bundling as soon as one or more conditions are met (e.g., as soon as the UE determines that there is uplink data scheduled for slot8, but that there is no pending uplink data to be transmitted during the CG-PUSCH occasion415-d). Having generated the dummy data for slot9, the UE may transmit DMRSs and data during slot8, and DMRSs and the dummy data during slot9. The UE may maintain phase continuity across slot8and slot9, such that the transmitted DMRSs are bundled.

In some examples, the UE may deprioritize DMRS bundling when performing PUSCH skipping in one of a set of adjacent CG-PUSCH occasions415. For example, if bundling is enabled, UE115may determine whether an actual payload is to be transmitted during a pending CG-PUSCH occasion415. For instance, the UE may determine that it does not have uplink data to transmit (e.g., that there is not sufficient data in a buffer to satisfy a threshold amount of data) during CG-PUSCH occasion415-hduring slot19. In such examples, if no actual payload is to be transmitted during CG-PUSCH occasion415-h, then the UE may refrain from performing DMRS bundling. That is, the UE may drop DMRS bundling around the PUSCH transmission during slot18. Upon determining that uplink data is to be transmitted during slot18, but that no uplink data is to be transmitted during slot19, the UE may determine not to maintain phase continuity (e.g., for DMRS bundling) across slots18and19. For example, the UE may configure one or more parameter values (e.g., may select parameter values for frequency resources, precoding settings, one or more antenna ports, a transmit power, or the like) for transmitting DMRSs and data during slot18, and a second set of different parameter values for transmitting DMRSs during slot19.

In some examples, the UE may generate dummy data and maintain phase continuity for DMRS bundling (e.g., as described with reference to slots8and9) based on one or more rules, which may be included in one or more standards documents, indicated to the UE by the base station, preconfigured at the UE, or any combination thereof. In some examples, the one or more rules may define the UE behavior based on whether the UE has data to transmit (e.g., in a CG PUSCH occasion415), whether a CG-PUSCH occasion415is located adjacent to one or more U slots in which uplink data is scheduled, or the like. In some examples, the UE may perform DMRS bundling during one or more slots if the UE can determine that the one or more conditions are satisfied within a threshold amount of time of the bundling interval (e.g., the two or more slot in which uplink signaling is scheduled).

In some examples, the UE may deprioritize DMRS bundling (e.g., may refrain from DMRS bundling or maintaining phase continuity for two or more slots as described with reference to slots18and19) based on one or more rules, which may be included in one or more standards documents, indicated to the UE by the base station, preconfigured at the UE, or any combination thereof. In some examples, the one or more rules may define the UE behavior based on whether the UE has data to transmit (e.g., in a CG PUSCH occasion415), whether a CG-PUSCH occasion415is located adjacent to one or more U slots in which uplink data is scheduled, or the like. In some examples, the UE may refrain from DMRS bundling during one or more slots if the UE can determine that the one or more conditions are or are not satisfied within a threshold amount of time of the bundling interval (e.g., the two or more slot in which uplink signaling is scheduled).

In some examples, a bundling interval may span more than two slots. The bundled slots may be back-to-back (e.g., consecutive), or may not be back to back (e.g., non-consecutive). For example,FIG.3is described with reference to scenarios in which two adjacent slots are scheduled for uplink signaling (e.g., via a dynamic grant and a configured grant). However, described techniques may apply to any number of slots in which uplink signaling is described. For instance, a CG-PUSCH occasion415may be located in a set of three or more U slots. For example, a DG-PUSCH may be scheduled prior to or after the CG-PUSCH occasion415, or another CG-PUSCH occasion may be located immediately prior to or immediately after the CG-PUSCH occasion415, or any combination thereof. In such examples, as described herein, the UE may generate dummy data (e.g., as illustrated with reference to slot8) and transmit the scheduled uplink data during the full set of slots, or may deprioritize DMRS bundling, refrain from transmitting during the CG-PUSCH occasion415(e.g., as illustrated with reference to slot18), and refrain from DMRS bundling across the full set of slots that includes the skipped CG-PUSCH occasion415.

In some examples, as described in greater detail with reference toFIG.4, the UE may generate dummy data and perform DMRS bundling in case of PUSCH skipping, or may deprioritize DMRS bundling in case of PUSCH skipping, for multiple adjacent CG-PUSCH occasions415.

FIG.5illustrates an example of a process flow500that supports techniques for demodulation reference signal bundling for configured and dynamic uplink channels in accordance with aspects of the present disclosure. Process flow500may include a UE115-band a base station105-b, which may be examples of a corresponding devices described with reference toFIGS.1-4.

At510, base station105-bmay transmit control signaling to UE115-b. The control signaling may include a configured grant scheduling multiple uplink channels (e.g., CG-PUSCHs) including a first uplink channel during a first time slot (e.g., slot, mini-slot, symbol, frame, subframe, or the like). The first time slot may be adjacent to a second time slot scheduled for transmission of a second uplink channel. In some examples, the first and second uplink channels may be two of a set of multiple (e.g., 3, 4, 8, 16, etc.) adjacent time slots. In some examples, the first time slot may not be adjacent to the second time slot. For example, the first and second time slot may be separated by one or more symbols or slots. The intervening symbols or slots may be allocated for transmission of a separate uplink channel, additional repetitions of a transmission, or the like.

In some examples, the first uplink channel and the second uplink channel may be CG-PUSCHs. For example, base station105-bmay transmit, and UE115-bmay receive (e.g., in the control signaling at510or separate control signaling) including a configured grant scheduling the second uplink channel during the second time slot.

In some examples, the first uplink channel may be a CG-PUSCH and the second uplink channel may be a DG-PUSCH. In such examples, at505, base station105-bmay transmit, and UE115-bmay receive, a DCI message. The DCI message may include a dynamic grant scheduling the second uplink channel during the second time slot.

In some examples, base station105-bmay transmit, to UE115-b, control signaling instructing UE115-bto maintain phase continuity across multiple uplink channels that include the first uplink channel and the second uplink channel. For example, base station105-bamay transmit control signaling that enables DMRS bundling, or uses DMRS bundling (e.g., for an amount of time that spans the first time slot and the second time slot, or based on one or more rules or conditions being satisfied, etc.).

At515, UE115-bmay generate dummy data for transmission to the base station105-b. For example, UE115-bmay determine that information associated with the configured grant fails to satisfy a transmission criterion. The transmission criterion may include one or more rules or constraints defining whether UE115-bis to transmit uplink data on the first uplink channel. In some examples, the transmission criterion may be a threshold amount of pending data in a buffer. For instance, if an amount of buffered data for UE115-bdoes not satisfy a threshold, then UE115-bmay generate the dummy data at515. In some examples, UE115-bmay determine not to perform PUSCH skipping, despite PUSCH skipping being enabled. For instance, base station105-bmay indicate, or one or more rules may instruct, that UE115-bis enabled to perform PUSCH skipping if the transmission criterion is not satisfied. However, upon determining that the UE115-bdoes not have enough data to transmit during the first time slot, or upon determining that the UE115-bis configured to transmit uplink data during the second slot (e.g., a CG_PUCSH or a DG-PUSCH), or both, UE115-bmay generate dummy data for transmission at520. UE115-bmay further prepare for DMRS bundling during the first and second time slots (e.g., may select one or more parameter values for transmitting uplink data and DMRSs at525and530). In some examples, UE115-bmay generate the dummy data and determine to maintain phase continuity at520and525based at least in part on receiving control signaling instruction the UE to maintain phase continuity, determining that there is no data to transmit during the first configured uplink channel, or both.

At520, UE115-bmay transmit the dummy data generated at515and one or more DMRSs to base station105-b. For example, during the first time slot, UE115-bmay transmit the dummy data at520-aand the DMRSs at520-b.

At525, UE115-bmay transmit the second uplink channel and one or more DMRSs to base station105-b. For example, during the second time slot, UE115-bmay transmit the second uplink channel at525-aand the DMRSs at525-b. UE115-bmay maintain phase continuity across the first time slot and the second time slot. For example, UE115-bmay select, for both the first time slot and the second time slot, one or more parameters. The one or more parameters used for transmissions in the first and second slot at520and525may include a phase value of the first uplink channel and the second uplink channel, a radio frequency band used by the first uplink channel and the second uplink channel, a resource block used by the first uplink channel and the second uplink channel, a transmission power of the first uplink channel and the second uplink channel, one or more antenna ports used for transmitting the first plurality of demodulation reference signals and the second plurality of demodulation reference signals, a precoding scheme of the first uplink channel and the second uplink channel, or any combination thereof.

At530, base station105-bmay perform a joint channel estimation based at least in part on receiving the DMRSs at520-band525-bhaving phase continuity.

Although described and illustrated with reference to data transmissions on a PUSCH, techniques described herein may also apply to control transmissions on a PUCCH (e.g., a UE may maintain phase continuity and perform DMRS bundling for adjacent uplink control transmissions having different TBs).

FIG.6illustrates an example of a process flow600may support techniques for demodulation reference signal bundling for configured and dynamic uplink channels in accordance with aspects of the present disclosure. Process flow600may include a UE115-cand a base station105-c, which may be examples of corresponding devices described with reference toFIGS.1-5.

At610, base station105-cmay transmit control signaling to UE115-c. The control signaling may include a configured grant scheduling multiple uplink channels (e.g., CG-PUSCHs) including a first uplink channel during a first time slot (e.g., slot, mini-slot, symbol, frame, subframe, or the like). The first time slot may be adjacent to a second time slot scheduled for transmission of a second uplink channel. In some examples, the first and second uplink channels may be two of a set of multiple (e.g., 3, 4, 8, 16, etc.) adjacent time slots.

In some examples, the first uplink channel and the second uplink channel may be CG-PUSCHs. For example, base station105-cmay transmit, and UE115-cmay receive (e.g., in the control signaling at610or separate control signaling) including a configured grant scheduling the second uplink channel during the second time slot.

In some examples, the first uplink channel may be a CG-PUSCH and the second uplink channel may be a DG-PUSCH. In such examples, at605, base station105-cmay transmit, and UE115-cmay receive, a DCI message. The DCI message may include a dynamic grant scheduling the second uplink channel during the second time slot.

In some examples, base station105-cmay transmit, to UE115-c, control signaling instructing UE115-cto maintain phase continuity across multiple uplink channels that include the first uplink channel and the second uplink channel. For example, base station105-cmay transmit control signaling that enables DMRS bundling, or uses DMRS bundling (e.g., for an amount of time that spans the first time slot and the second time slot, or based on one or more rules or conditions being satisfied, etc.).

At615, UE115-cmay suppress transmission of the first uplink channel. IN some examples, UE115-cmay suppress the transmission in the first time slot based at least in part on information associated with the configured grant failing to satisfy a transmission criterion. The transmission criterion may include one or more rules or constraints defining whether UE115-cis to transmit uplink data on the first uplink channel. In some examples, the transmission criterion may be a threshold amount of pending data in a buffer. For instance, if an amount of buffered data for UE115-cdoes not satisfy a threshold, then UE115-cmay suppress uplink transmission during the first time slot at615. In some examples, UE115-cmay determine to deprioritize DMRS bundling and performing PUSCH skipping based at least in part on PUSCH skipping being enabled. For instance, base station105-cmay indicate, or one or more rules may instruct, that UE115-cis enabled to perform PUSCH skipping if the transmission criterion is not satisfied. However, upon determining that the UE115-cdoes not have enough data to transmit during the first time slot, or upon determining that the UE115-cis configured to transmit uplink data during the second slot (e.g., a CG-PUCSH or a DG-PUSCH), or both, UE115-cmay suppress transmission on the first uplink channel. UE115-cmay further prepare for transmissions across the first and second time slots without performing DMRS bundling (e.g., may select one or more parameter values for transmitting DMRSs at625and different parameter values for transmitting uplink data and DMRSs at630).

At620, UE115-cmay transmit one or more DMRSs to base station105-c. UE115-cmay transmit the DMRSs using a first set of parameter values. However, based at least in part on the suppressing at615, UE115-cmay not transmit any uplink data during the first time slot (e.g., may perform PUSCH skipping).

At625, UE115-cmay transmit the second uplink channel and one or more DMRSs to base station105-c. For example, during the second time slot, UE115-cmay transmit the second uplink channel at625-aand the DMRSs at625-b. UE115-cmay not maintain phase continuity across the first time slot and the second time slot. For example, UE115-cmay select, for the second time slot, one or more parameters different from the parameters used to transmit DMRSs at620. The one or more parameters used for transmissions in the first slot at620may include a phase value of the first uplink channel, a radio frequency band used by the first uplink channel, a transmission power of the first uplink channel, one or more antenna ports used for transmitting the first plurality of demodulation reference signals, a precoding scheme of the first uplink channel, or any combination thereof. The one or more parameters used for transmissions in the second slot at625may include a phase value of the second uplink channel, a radio frequency band used by the second uplink channel, a resource block used by the first uplink channel and the second uplink channel, a transmission power of the second uplink channel, one or more antenna ports used for transmitting the second plurality of demodulation reference signals, a precoding scheme of the second uplink channel, or any combination thereof.

Although described and illustrated with reference to data transmissions on a PUSCH, techniques described herein may also apply to control transmissions on a PUCCH (e.g., a UE may maintain phase continuity and perform DMRS bundling for adjacent uplink control transmissions having different TBs).

FIG.7shows a block diagram700of a device705that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The device705may be an example of aspects of a UE115as described herein. The device705may include a receiver710, a transmitter715, and a communications manager720. The device705may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The communications manager720, the receiver710, the transmitter715, or various combinations thereof or various components thereof may be examples of means for performing various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein. For example, the communications manager720, the receiver710, the transmitter715, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

In some examples, the communications manager720may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver710, the transmitter715, or both. For example, the communications manager720may receive information from the receiver710, send information to the transmitter715, or be integrated in combination with the receiver710, the transmitter715, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager720may support wireless communications at a UE in accordance with examples as disclosed herein. For example, the communications manager720may be configured as or otherwise support a means for receiving, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The communications manager720may be configured as or otherwise support a means for generating dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion. The communications manager720may be configured as or otherwise support a means for transmitting, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

Additionally, or alternatively, the communications manager720may support wireless communications a UE in accordance with examples as disclosed herein. For example, the communications manager720may be configured as or otherwise support a means for receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The communications manager720may be configured as or otherwise support a means for receiving, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The communications manager720may be configured as or otherwise support a means for suppressing a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion. The communications manager720may be configured as or otherwise support a means for transmitting, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

By including or configuring the communications manager720in accordance with examples as described herein, the device705(e.g., a processor controlling or otherwise coupled to the receiver710, the transmitter715, the communications manager720, or a combination thereof) may support techniques for DMRS bundling for configured uplink channels resulting in more efficient use of resources, more robust demodulation (e.g., resulting from joint channel estimation), more accurate decoding, decreased retransmissions of data messages, and decreased latency.

FIG.8shows a block diagram800of a device805that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The device805may be an example of aspects of a device705or a UE115as described herein. The device805may include a receiver810, a transmitter815, and a communications manager820. The device805may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The receiver810may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for demodulation reference signal bundling for configured uplink channels). Information may be passed on to other components of the device805. The receiver810may utilize a single antenna or a set of multiple antennas.

The transmitter815may provide a means for transmitting signals generated by other components of the device805. For example, the transmitter815may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for demodulation reference signal bundling for configured uplink channels). In some examples, the transmitter815may be co-located with a receiver810in a transceiver module. The transmitter815may utilize a single antenna or a set of multiple antennas.

The device805, or various components thereof, may be an example of means for performing various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein. For example, the communications manager820may include a configured grant manager825, a dummy data manager830, a phase continuity manager835, a transmission suppression manager840, an uplink skipping manager845, or any combination thereof. The communications manager820may be an example of aspects of a communications manager720as described herein. In some examples, the communications manager820, or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver810, the transmitter815, or both. For example, the communications manager820may receive information from the receiver810, send information to the transmitter815, or be integrated in combination with the receiver810, the transmitter815, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager820may support wireless communications at a UE in accordance with examples as disclosed herein. The configured grant manager825may be configured as or otherwise support a means for receiving, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The dummy data manager830may be configured as or otherwise support a means for generating dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion. The phase continuity manager835may be configured as or otherwise support a means for transmitting, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

Additionally, or alternatively, the communications manager820may support wireless communications a UE in accordance with examples as disclosed herein. The phase continuity manager835may be configured as or otherwise support a means for receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The configured grant manager825may be configured as or otherwise support a means for receiving, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The transmission suppression manager840may be configured as or otherwise support a means for suppressing a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion. The uplink skipping manager845may be configured as or otherwise support a means for transmitting, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

FIG.9shows a block diagram900of a communications manager920that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The communications manager920may be an example of aspects of a communications manager720, a communications manager820, or both, as described herein. The communications manager920, or various components thereof, may be an example of means for performing various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein. For example, the communications manager920may include a configured grant manager925, a dummy data manager930, a phase continuity manager935, a transmission suppression manager940, an uplink skipping manager945, a dynamic grant manager950, a transmission criterion manager955, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The communications manager920may support wireless communications at a UE in accordance with examples as disclosed herein. The configured grant manager925may be configured as or otherwise support a means for receiving, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The dummy data manager930may be configured as or otherwise support a means for generating dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion. The phase continuity manager935may be configured as or otherwise support a means for transmitting, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

In some examples, the phase continuity manager935may be configured as or otherwise support a means for receiving, from the base station, control signaling instructing the UE to maintain the phase continuity across a set of multiple uplink channels including a first uplink channel and the second uplink channel.

In some examples, generating the dummy data for the first uplink channel is based on receiving the control signaling instructing the UE to maintain the phase continuity across the set of multiple uplink channels.

In some examples, the dynamic grant manager950may be configured as or otherwise support a means for receiving, from the base station, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel is based on receiving the dynamic grant.

In some examples, the configured grant manager925may be configured as or otherwise support a means for receiving, from the base station, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel is based on receiving the second configured grant.

In some examples, the transmission criterion manager955may be configured as or otherwise support a means for determining that a quantity of data in a buffer for transmission to the base station failing to satisfy a threshold, where the configured grant failing to satisfy the transmission criterion and transmitting the dummy data is based on the determining.

In some examples, one or more of parameters used to maintain the phase continuity includes a phase value of the first uplink channel and the second uplink channel, a radio frequency band used by the first uplink channel and the second uplink channel, a resource block used by the first uplink channel and the second uplink channel, a transmission power of the first uplink channel and the second uplink channel, one or more antenna ports used for transmitting the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals, a precoding scheme of the first uplink channel and the second uplink channel, or any combination thereof.

In some examples, the phase continuity manager935may be configured as or otherwise support a means for maintaining the phase continuity across the first time slot and the second time slot using a demodulation reference signal bundling procedure that supports joint channel estimation at the base station, where the transmitting is based on maintaining the phase continuity.

In some examples, the first uplink channel includes a physical uplink shared channel. In some examples, the second uplink channel includes a physical uplink shared channel.

Additionally, or alternatively, the communications manager920may support wireless communications a UE in accordance with examples as disclosed herein. In some examples, the phase continuity manager935may be configured as or otherwise support a means for receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. In some examples, the configured grant manager925may be configured as or otherwise support a means for receiving, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The transmission suppression manager940may be configured as or otherwise support a means for suppressing a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion. The uplink skipping manager945may be configured as or otherwise support a means for transmitting, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

In some examples, the dynamic grant manager950may be configured as or otherwise support a means for receiving, from the base station, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel is based on receiving the dynamic grant.

In some examples, the configured grant manager925may be configured as or otherwise support a means for transmitting, to the UE, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where transmitting the second set of multiple demodulation reference signals in the second uplink channel is based on receiving the configured grant.

In some examples, the transmission criterion manager955may be configured as or otherwise support a means for determining that a quantity of data in a buffer for transmission to the base station failing to satisfy a threshold, where the configured grant failing to satisfy the transmission criterion and transmitting the dummy data is based on the determining.

In some examples, the phase continuity manager935may be configured as or otherwise support a means for selecting, based on the suppressing, a first set of parameters for transmitting the first set of multiple demodulation reference signals. In some examples, the phase continuity manager935may be configured as or otherwise support a means for selecting, based on the suppressing, a second set of parameters for transmitting the second set of multiple demodulation reference signals, where the second set of parameter values are different from the first set of parameter values.

In some examples, the first set of parameters includes a phase value of the first uplink channel, a radio frequency band used by the first uplink channel, a transmission power of the first uplink channel, one or more antenna ports used for transmitting the first set of multiple demodulation reference signals, a precoding scheme of the first uplink channel, or any combination thereof. In some examples, the second set of parameters includes a phase value of the second uplink channel, a radio frequency band used by the second uplink channel, a transmission power of the second uplink channel, one or more antenna ports used for transmitting the second set of multiple demodulation reference signals, a precoding scheme of the second uplink channel, or any combination thereof.

In some examples, the first uplink channel includes a physical uplink shared channel. In some examples, the second uplink channel includes a physical uplink shared channel.

FIG.10shows a diagram of a system1000including a device1005that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The device1005may be an example of or include the components of a device705, a device805, or a UE115as described herein. The device1005may communicate wirelessly with one or more base stations105, UEs115, or any combination thereof. The device1005may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager1020, an input/output (I/O) controller1010, a transceiver1015, an antenna1025, a memory1030, code1035, and a processor1040. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus1045).

The processor1040may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor1040may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the processor1040. The processor1040may be configured to execute computer-readable instructions stored in a memory (e.g., the memory1030) to cause the device1005to perform various functions (e.g., functions or tasks supporting techniques for demodulation reference signal bundling for configured uplink channels). For example, the device1005or a component of the device1005may include a processor1040and memory1030coupled to the processor1040, the processor1040and memory1030configured to perform various functions described herein.

The communications manager1020may support wireless communications at a UE in accordance with examples as disclosed herein. For example, the communications manager1020may be configured as or otherwise support a means for receiving, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The communications manager1020may be configured as or otherwise support a means for generating dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion. The communications manager1020may be configured as or otherwise support a means for transmitting, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity.

Additionally, or alternatively, the communications manager1020may support wireless communications a UE in accordance with examples as disclosed herein. For example, the communications manager1020may be configured as or otherwise support a means for receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The communications manager1020may be configured as or otherwise support a means for receiving, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The communications manager1020may be configured as or otherwise support a means for suppressing a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion. The communications manager1020may be configured as or otherwise support a means for transmitting, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing.

By including or configuring the communications manager1020in accordance with examples as described herein, the device1005may support techniques for DMRS bundling for configured uplink channels resulting in more efficient use of resources, more robust demodulation (e.g., resulting from joint channel estimation), more accurate decoding, decreased retransmissions of data messages, and decreased latency.

In some examples, the communications manager1020may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver1015, the one or more antennas1025, or any combination thereof. Although the communications manager1020is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager1020may be supported by or performed by the processor1040, the memory1030, the code1035, or any combination thereof. For example, the code1035may include instructions executable by the processor1040to cause the device1005to perform various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein, or the processor1040and the memory1030may be otherwise configured to perform or support such operations.

FIG.11shows a block diagram1100of a device1105that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The device1105may be an example of aspects of a base station105as described herein. The device1105may include a receiver1110, a transmitter1115, and a communications manager1120. The device1105may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The communications manager1120, the receiver1110, the transmitter1115, or various combinations thereof or various components thereof may be examples of means for performing various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein. For example, the communications manager1120, the receiver1110, the transmitter1115, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

In some examples, the communications manager1120may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver1110, the transmitter1115, or both. For example, the communications manager1120may receive information from the receiver1110, send information to the transmitter1115, or be integrated in combination with the receiver1110, the transmitter1115, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager1120may support wireless communications at a base station in accordance with examples as disclosed herein. For example, the communications manager1120may be configured as or otherwise support a means for transmitting, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The communications manager1120may be configured as or otherwise support a means for receiving, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity. The communications manager1120may be configured as or otherwise support a means for performing channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity. The communications manager1120may be configured as or otherwise support a means for decoding the second uplink channel based on the channel estimation.

Additionally, or alternatively, the communications manager1120may support wireless communications at a base station in accordance with examples as disclosed herein. For example, the communications manager1120may be configured as or otherwise support a means for transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The communications manager1120may be configured as or otherwise support a means for transmitting, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The communications manager1120may be configured as or otherwise support a means for monitoring for the first uplink channel during the first time slot and the second uplink channel during the second time slot. The communications manager1120may be configured as or otherwise support a means for receiving, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

By including or configuring the communications manager1120in accordance with examples as described herein, the device1105(e.g., a processor controlling or otherwise coupled to the receiver1110, the transmitter1115, the communications manager1120, or a combination thereof) may support techniques for DMRS bundling for configured uplink channels resulting in more efficient use of resources, more robust demodulation (e.g., resulting from joint channel estimation), more accurate decoding, decreased retransmissions of data messages, and decreased latency.

The receiver1210may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for demodulation reference signal bundling for configured uplink channels). Information may be passed on to other components of the device1205. The receiver1210may utilize a single antenna or a set of multiple antennas.

The transmitter1215may provide a means for transmitting signals generated by other components of the device1205. For example, the transmitter1215may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for demodulation reference signal bundling for configured uplink channels). In some examples, the transmitter1215may be co-located with a receiver1210in a transceiver module. The transmitter1215may utilize a single antenna or a set of multiple antennas.

The device1205, or various components thereof, may be an example of means for performing various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein. For example, the communications manager1220may include a configured grant manager1225, a phase continuity manager1230, a channel estimation manager1235, a decoding manager1240, a monitoring manager1245, an uplink skipping manager1250, or any combination thereof. The communications manager1220may be an example of aspects of a communications manager1120as described herein. In some examples, the communications manager1220, or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver1210, the transmitter1215, or both. For example, the communications manager1220may receive information from the receiver1210, send information to the transmitter1215, or be integrated in combination with the receiver1210, the transmitter1215, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager1220may support wireless communications at a base station in accordance with examples as disclosed herein. The configured grant manager1225may be configured as or otherwise support a means for transmitting, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The phase continuity manager1230may be configured as or otherwise support a means for receiving, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity. The channel estimation manager1235may be configured as or otherwise support a means for performing channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity. The decoding manager1240may be configured as or otherwise support a means for decoding the second uplink channel based on the channel estimation.

Additionally, or alternatively, the communications manager1220may support wireless communications at a base station in accordance with examples as disclosed herein. The phase continuity manager1230may be configured as or otherwise support a means for transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The configured grant manager1225may be configured as or otherwise support a means for transmitting, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The monitoring manager1245may be configured as or otherwise support a means for monitoring for the first uplink channel during the first time slot and the second uplink channel during the second time slot. The uplink skipping manager1250may be configured as or otherwise support a means for receiving, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

FIG.13shows a block diagram1300of a communications manager1320that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The communications manager1320may be an example of aspects of a communications manager1120, a communications manager1220, or both, as described herein. The communications manager1320, or various components thereof, may be an example of means for performing various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein. For example, the communications manager1320may include a configured grant manager1325, a phase continuity manager1330, a channel estimation manager1335, a decoding manager1340, a monitoring manager1345, an uplink skipping manager1350, a dynamic grant manager1355, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The communications manager1320may support wireless communications at a base station in accordance with examples as disclosed herein. The configured grant manager1325may be configured as or otherwise support a means for transmitting, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The phase continuity manager1330may be configured as or otherwise support a means for receiving, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity. The channel estimation manager1335may be configured as or otherwise support a means for performing channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity. The decoding manager1340may be configured as or otherwise support a means for decoding the second uplink channel based on the channel estimation.

In some examples, the phase continuity manager1330may be configured as or otherwise support a means for transmitting, to the UE, control signaling instructing the UE to maintain the phase continuity across a set of multiple uplink channels including a first uplink channel and the second uplink channel.

In some examples, receiving the dummy data in the first uplink channel is based on transmitting the control signaling instructing the UE to maintain the phase continuity across the set of multiple uplink channels.

In some examples, the dynamic grant manager1355may be configured as or otherwise support a means for transmitting, to the UE, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel is based on transmitting the dynamic grant.

In some examples, the configured grant manager1325may be configured as or otherwise support a means for transmitting, to the UE, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel is based on transmitting the second configured grant.

In some examples, receiving the dummy data is based on the configured grant failing to satisfy a transmission criterion for the UE.

In some examples, one or more parameters used to receive the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having the phase continuity includes a phase value of the first uplink channel and the second uplink channel, a radio frequency band used by the first uplink channel and the second uplink channel, a resource block used by the first uplink channel and the second uplink channel, a transmission power of the first uplink channel and the second uplink channel, one or more antenna ports used for receiving the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals, a precoding scheme of the first uplink channel and the second uplink channel, or any combination thereof.

In some examples, the first uplink channel includes a physical uplink shared channel. In some examples, the second uplink channel includes a physical uplink shared channel.

Additionally, or alternatively, the communications manager1320may support wireless communications at a base station in accordance with examples as disclosed herein. In some examples, the phase continuity manager1330may be configured as or otherwise support a means for transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. In some examples, the configured grant manager1325may be configured as or otherwise support a means for transmitting, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The monitoring manager1345may be configured as or otherwise support a means for monitoring for the first uplink channel during the first time slot and the second uplink channel during the second time slot. The uplink skipping manager1350may be configured as or otherwise support a means for receiving, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

In some examples, the dynamic grant manager1355may be configured as or otherwise support a means for transmitting, to the UE, a downlink control information message including a dynamic grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel is based on transmitting the dynamic grant.

In some examples, the configured grant manager1325may be configured as or otherwise support a means for transmitting, to the UE, control signaling including a second configured grant scheduling the second uplink channel during the second time slot, where receiving the second set of multiple demodulation reference signals in the second uplink channel is based on transmitting the configured grant.

In some examples, the channel estimation manager1335may be configured as or otherwise support a means for refraining from performing a channel estimation for the first uplink channel and the second uplink channel based on failing to receive the first uplink channel and the second set of multiple demodulation reference signals failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

In some examples, the phase continuity manager1330may be configured as or otherwise support a means for receiving the first set of multiple demodulation reference signals according to a first set of parameters based on the monitoring and the first set of multiple demodulation reference signals failing to maintain phase continuity with the first set of multiple demodulation reference signals. In some examples, the phase continuity manager1330may be configured as or otherwise support a means for receiving the second set of multiple demodulation reference signals according to a second set of parameters based on the monitoring and the second set of multiple demodulation reference signals failing to maintain phase continuity with the first set of multiple demodulation reference signals.

In some examples, the first uplink channel includes a physical uplink shared channel. In some examples, the second uplink channel includes a physical uplink shared channel.

FIG.14shows a diagram of a system1400including a device1405that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The device1405may be an example of or include the components of a device1105, a device1205, or a base station105as described herein. The device1405may communicate wirelessly with one or more base stations105, UEs115, or any combination thereof. The device1405may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager1420, a network communications manager1410, a transceiver1415, an antenna1425, a memory1430, code1435, a processor1440, and an inter-station communications manager1445. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus1450).

The network communications manager1410may manage communications with a core network130(e.g., via one or more wired backhaul links). For example, the network communications manager1410may manage the transfer of data communications for client devices, such as one or more UEs115.

In some cases, the device1405may include a single antenna1425. However, in some other cases the device1405may have more than one antenna1425, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver1415may communicate bi-directionally, via the one or more antennas1425, wired, or wireless links as described herein. For example, the transceiver1415may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver1415may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas1425for transmission, and to demodulate packets received from the one or more antennas1425. The transceiver1415, or the transceiver1415and one or more antennas1425, may be an example of a transmitter1115, a transmitter1215, a receiver1110, a receiver1210, or any combination thereof or component thereof, as described herein.

The memory1430may include RAM and ROM. The memory1430may store computer-readable, computer-executable code1435including instructions that, when executed by the processor1440, cause the device1405to perform various functions described herein. The code1435may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code1435may not be directly executable by the processor1440but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the memory1430may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor1440may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor1440may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the processor1440. The processor1440may be configured to execute computer-readable instructions stored in a memory (e.g., the memory1430) to cause the device1405to perform various functions (e.g., functions or tasks supporting techniques for demodulation reference signal bundling for configured uplink channels). For example, the device1405or a component of the device1405may include a processor1440and memory1430coupled to the processor1440, the processor1440and memory1430configured to perform various functions described herein.

The communications manager1420may support wireless communications at a base station in accordance with examples as disclosed herein. For example, the communications manager1420may be configured as or otherwise support a means for transmitting, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The communications manager1420may be configured as or otherwise support a means for receiving, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity. The communications manager1420may be configured as or otherwise support a means for performing channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity. The communications manager1420may be configured as or otherwise support a means for decoding the second uplink channel based on the channel estimation.

Additionally, or alternatively, the communications manager1420may support wireless communications at a base station in accordance with examples as disclosed herein. For example, the communications manager1420may be configured as or otherwise support a means for transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The communications manager1420may be configured as or otherwise support a means for transmitting, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The communications manager1420may be configured as or otherwise support a means for monitoring for the first uplink channel during the first time slot and the second uplink channel during the second time slot. The communications manager1420may be configured as or otherwise support a means for receiving, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals.

By including or configuring the communications manager1420in accordance with examples as described herein, the device1405may support techniques for DMRS bundling for configured uplink channels resulting in more efficient use of resources, more robust demodulation (e.g., resulting from joint channel estimation), more accurate decoding, decreased retransmissions of data messages, and decreased latency.

In some examples, the communications manager1420may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver1415, the one or more antennas1425, or any combination thereof. Although the communications manager1420is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager1420may be supported by or performed by the processor1440, the memory1430, the code1435, or any combination thereof. For example, the code1435may include instructions executable by the processor1440to cause the device1405to perform various aspects of techniques for demodulation reference signal bundling for configured uplink channels as described herein, or the processor1440and the memory1430may be otherwise configured to perform or support such operations.

FIG.15shows a flowchart illustrating a method1500that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The operations of the method1500may be implemented by a UE or its components as described herein. For example, the operations of the method1500may be performed by a UE115as described with reference toFIGS.1through10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.

At1505, the method may include receiving, from a base station, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The operations of1505may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1505may be performed by a configured grant manager925as described with reference toFIG.9.

At1510, the method may include generating dummy data for the first uplink channel based on information associated with the configured grant failing to satisfy a transmission criterion. The operations of1510may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1510may be performed by a dummy data manager930as described with reference toFIG.9.

At1515, the method may include transmitting, to the base station, the dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity. The operations of1515may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1515may be performed by a phase continuity manager935as described with reference toFIG.9.

FIG.16shows a flowchart illustrating a method1600that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The operations of the method1600may be implemented by a base station or its components as described herein. For example, the operations of the method1600may be performed by a base station105as described with reference toFIGS.1through6and11through14. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the described functions. Additionally, or alternatively, the base station may perform aspects of the described functions using special-purpose hardware.

At1605, the method may include transmitting, to a UE, control signaling including a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel. The operations of1605may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1605may be performed by a configured grant manager1325as described with reference toFIG.13.

At1610, the method may include receiving, from the UE based on the configured grant, dummy data and a first set of multiple demodulation reference signals in the first uplink channel during the first time slot and a second set of multiple demodulation reference signals in the second uplink channel during the second time slot, the first set of multiple demodulation reference signals and the second set of multiple demodulation reference signals having phase continuity. The operations of1610may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1610may be performed by a phase continuity manager1330as described with reference toFIG.13.

At1615, the method may include performing channel estimation for at least the second uplink channel based on the first set of multiple demodulation reference signals and the second uplink channel having phase continuity. The operations of1615may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1615may be performed by a channel estimation manager1335as described with reference toFIG.13.

At1620, the method may include decoding the second uplink channel based on the channel estimation. The operations of1620may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1620may be performed by a decoding manager1340as described with reference toFIG.13.

FIG.17shows a flowchart illustrating a method1700that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The operations of the method1700may be implemented by a UE or its components as described herein. For example, the operations of the method1700may be performed by a UE115as described with reference toFIGS.1through10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.

At1705, the method may include receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The operations of1705may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1705may be performed by a phase continuity manager935as described with reference toFIG.9.

At1710, the method may include receiving, from the base station, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The operations of1710may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1710may be performed by a configured grant manager925as described with reference toFIG.9.

At1715, the method may include suppressing a transmission of the first uplink channel during the first time slot based on information associated with the configured grant failing to satisfy a transmission criterion. The operations of1715may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1715may be performed by a transmission suppression manager940as described with reference toFIG.9.

At1720, the method may include transmitting, to the base station, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals based on the suppressing. The operations of1720may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1720may be performed by an uplink skipping manager945as described with reference toFIG.9.

FIG.18shows a flowchart illustrating a method1800that supports techniques for demodulation reference signal bundling for configured uplink channels in accordance with aspects of the present disclosure. The operations of the method1800may be implemented by a base station or its components as described herein. For example, the operations of the method1800may be performed by a base station105as described with reference toFIGS.1through6and11through14. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the described functions. Additionally, or alternatively, the base station may perform aspects of the described functions using special-purpose hardware.

At1805, the method may include transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first set of multiple demodulation reference signals in a first uplink channel and a second set of multiple demodulation reference signals in a second uplink channel. The operations of1805may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1805may be performed by a phase continuity manager1330as described with reference toFIG.13.

At1810, the method may include transmitting, to the UE, control signaling including a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel. The operations of1810may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1810may be performed by a configured grant manager1325as described with reference toFIG.13.

At1815, the method may include monitoring for the first uplink channel during the first time slot and the second uplink channel during the second time slot. The operations of1815may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1815may be performed by a monitoring manager1345as described with reference toFIG.13.

At1820, the method may include receiving, from the UE based on the monitoring, the second uplink channel and the second set of multiple demodulation reference signals associated with at least the second uplink channel, the second set of multiple demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first set of multiple demodulation reference signals. The operations of1820may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1820may be performed by an uplink skipping manager1350as described with reference toFIG.13.

Aspect 1: A method for wireless communications at a UE, comprising: receiving, from a base station, control signaling comprising a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel; generating dummy data for the first uplink channel based at least in part on information associated with the configured grant failing to satisfy a transmission criterion; and transmitting, to the base station, the dummy data and a first plurality of demodulation reference signals in the first uplink channel during the first time slot and a second plurality of demodulation reference signals in the second uplink channel during the second time slot, the first plurality of demodulation reference signals and the second plurality of demodulation reference signals having phase continuity.

Aspect 2: The method of aspect 1, further comprising: receiving, from the base station, control signaling instructing the UE to maintain the phase continuity across a plurality of uplink channels comprising the first uplink channel and the second uplink channel.

Aspect 3: The method of aspect 2, wherein generating the dummy data for the first uplink channel is based at least in part on receiving the control signaling instructing the UE to maintain the phase continuity across the plurality of uplink channels.

Aspect 4: The method of any of aspects 1 through 3, further comprising: receiving, from the base station, a downlink control information message comprising a dynamic grant scheduling the second uplink channel during the second time slot, wherein transmitting the second plurality of demodulation reference signals in the second uplink channel is based at least in part on receiving the dynamic grant.

Aspect 5: The method of any of aspects 1 through 4, further comprising: receiving, from the base station, control signaling comprising a second configured grant scheduling the second uplink channel during the second time slot, wherein transmitting the second plurality of demodulation reference signals in the second uplink channel is based at least in part on receiving the second configured grant.

Aspect 6: The method of aspect 5, wherein the first configured grant comprises a first instance of a first set of configured grant resources and the second configured grant comprises a second instance of the first set of configured grant resources; or the first configured grant comprises an instance of a first set of configured grant resources and the second configured grant comprises an instance of a second set of configured grant resources.

Aspect 7: The method of any of aspects 1 through 6, further comprising: determining that a quantity of data in a buffer for transmission to the base station fails to satisfy a threshold, wherein the configured grant failing to satisfy the transmission criterion and transmitting the dummy data is based at least in part on the determining.

Aspect 8: The method of any of aspects 1 through 7, wherein one or more of parameters used to maintain the phase continuity comprises a phase value of the first uplink channel and the second uplink channel, a radio frequency band used by the first uplink channel and the second uplink channel, a transmission power of the first uplink channel and the second uplink channel, one or more antenna ports used for transmitting the first plurality of demodulation reference signals and the second plurality of demodulation reference signals, a precoding scheme of the first uplink channel and the second uplink channel, or any combination thereof.

Aspect 9: The method of any of aspects 1 through 8, further comprising: maintaining the phase continuity across the first time slot and the second time slot using a demodulation reference signal bundling procedure that supports joint channel estimation at the base station, wherein the transmitting is based at least in part on maintaining the phase continuity.

Aspect 10: The method of any of aspects 1 through 9, wherein the first uplink channel comprises a physical uplink shared channel; and the second uplink channel comprises a physical uplink shared channel.

Aspect 11: A method for wireless communications at a base station, comprising: transmitting, to a UE, control signaling comprising a configured grant scheduling a first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of a second uplink channel; receiving, from the UE based at least in part on the configured grant, dummy data and a first plurality of demodulation reference signals in the first uplink channel during the first time slot and a second plurality of demodulation reference signals in the second uplink channel during the second time slot, the first plurality of demodulation reference signals and the second plurality of demodulation reference signals having phase continuity; performing channel estimation for at least the second uplink channel based at least in part on the first plurality of demodulation reference signals and the second uplink channel having phase continuity; and decoding the second uplink channel based at least in part on the channel estimation.

Aspect 12: The apparatus of aspect 11, further comprising: transmitting, to the UE, control signaling instructing the UE to maintain the phase continuity across a plurality of uplink channels comprising the first uplink channel and the second uplink channel.

Aspect 13: The method of aspect 12, wherein receiving the dummy data in the first uplink channel is based at least in part on transmitting the control signaling instructing the UE to maintain the phase continuity across the plurality of uplink channels.

Aspect 14: The apparatus of any of aspects 11 through 13, further comprising: transmitting, to the UE, a downlink control information message comprising a dynamic grant scheduling the second uplink channel during the second time slot, wherein receiving the second plurality of demodulation reference signals in the second uplink channel is based at least in part on transmitting the dynamic grant.

Aspect 15: The apparatus of any of aspects 11 through 14, wherein the instructions are further executable by the processor to cause the apparatus to transmitting, to the UE, control signaling comprising a second configured grant scheduling the second uplink channel during the second time slot, wherein receiving the second plurality of demodulation reference signals in the second uplink channel is based at least in part on transmitting the second configured grant.

Aspect 16: The method of any of aspects 11 through 15, wherein receiving the dummy data is based at least in part on the configured grant failing to satisfy a transmission criterion for the UE.

Aspect 17: The method of any of aspects 11 through 16, wherein one or more parameters used to receive the first plurality of demodulation reference signals and the second plurality of demodulation reference signals having the phase continuity comprises a phase value of the first uplink channel and the second uplink channel, a radio frequency band used by the first uplink channel and the second uplink channel, a resource block used by the first uplink channel and the second uplink channel, a transmission power of the first uplink channel and the second uplink channel, one or more antenna ports used for receiving the first plurality of demodulation reference signals and the second plurality of demodulation reference signals, a precoding scheme of the first uplink channel and the second uplink channel, or any combination thereof.

Aspect 18: A method for wireless communications a UE, comprising: receiving, from a base station, control signaling instructing the UE to maintain phase continuity between a first plurality of demodulation reference signals in a first uplink channel and a second plurality of demodulation reference signals in a second uplink channel; receiving, from the base station, control signaling comprising a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel; suppressing a transmission of the first uplink channel during the first time slot based at least in part on information associated with the configured grant failing to satisfy a transmission criterion; and transmitting, to the base station, the second uplink channel and the second plurality of demodulation reference signals associated with at least the second uplink channel, the second plurality of demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first plurality of demodulation reference signals based at least in part on the suppressing.

Aspect 19: The method of aspect 18, further comprising: receiving, from the base station, a downlink control information message comprising a dynamic grant scheduling the second uplink channel during the second time slot, wherein transmitting the second plurality of demodulation reference signals in the second uplink channel is based at least in part on receiving the dynamic grant.

Aspect 20: The method of any of aspects 18 through 19, further comprising: receiving, from the base station, control signaling comprising a second configured grant scheduling the second uplink channel during the second time slot, wherein transmitting the second plurality of demodulation reference signals in the second uplink channel is based at least in part on receiving the configured grant.

Aspect 21: The method of aspect 20, wherein the first configured grant comprises a first instance of a first set of configured grant resources and the second configured grant comprises a second instance of the first set of configured grant resources; or the first configured grant comprises an instance of a first set of configured grant resources and the second configured grant comprises an instance of a second set of configured grant resources.

Aspect 22: The method of any of aspects 18 through 21, further comprising: determining that a quantity of data in a buffer for transmission to the base station failing to satisfy a threshold, wherein the configured grant failing to satisfy the transmission criterion and transmitting the dummy data is based at least in part on the determining.

Aspect 23: The method of any of aspects 18 through 22, further comprising: selecting, based at least in part on the suppressing, a first set of parameters for transmitting the first plurality of demodulation reference signals; and selecting, based at least in part on the suppressing, a second set of parameters for transmitting the second plurality of demodulation reference signals, wherein the second set of parameters are different from the first set of parameters.

Aspect 24: The method of aspect 23, wherein the first set of parameters comprises a phase value of the first uplink channel, a radio frequency band used by the first uplink channel, a transmission power of the first uplink channel, one or more antenna ports used for transmitting the first plurality of demodulation reference signals, a precoding scheme of the first uplink channel, or any combination thereof; and the second set of parameters comprises a phase value of the second uplink channel, a radio frequency band used by the second uplink channel, a transmission power of the second uplink channel, one or more antenna ports used for transmitting the second plurality of demodulation reference signals, a precoding scheme of the second uplink channel, or any combination thereof.

Aspect 25: The method of any of aspects 18 through 24, wherein the first uplink channel comprises a physical uplink shared channel or a physical uplink control channel; and the second uplink channel comprises a physical uplink shared channel or a physical uplink control channel.

Aspect 26: A method for wireless communications at a base station, comprising: transmitting, to a UE, control signaling instructing the UE to maintain phase continuity between a first plurality of demodulation reference signals in a first uplink channel and a second plurality of demodulation reference signals in a second uplink channel; transmitting, to the UE, control signaling comprising a configured grant scheduling the first uplink channel during a first time slot, the first time slot different from a second time slot scheduled for transmission of the second uplink channel; monitor for the first uplink channel during the first time slot and the second uplink channel during the second time slot; and receive, from the UE based at least in part on the monitoring, the second uplink channel and the second plurality of demodulation reference signals associated with at least the second uplink channel, the second plurality of demodulation reference signals of the second uplink channel failing to maintain the phase continuity with the first plurality of demodulation reference signals.

Aspect 27: The method of aspect 26, further comprising: transmitting, to the UE, a downlink control information message comprising a dynamic grant scheduling the second uplink channel during the second time slot, wherein receiving the second plurality of demodulation reference signals in the second uplink channel is based at least in part on transmitting the dynamic grant.

Aspect 28: The method of any of aspects 26 through 27, further comprising: transmitting, to the UE, control signaling comprising a second configured grant scheduling the second uplink channel during the second time slot, wherein receiving the second plurality of demodulation reference signals in the second uplink channel is based at least in part on transmitting the configured grant.

Aspect 29: The method of any of aspects 26 through 28, further comprising: refraining from performing a channel estimation for the first uplink channel and the second uplink channel based at least in part on failing to receive the first uplink channel and the second plurality of demodulation reference signals failing to maintain the phase continuity with the first plurality of demodulation reference signals.

Aspect 30: The method of any of aspects 26 through 29, further comprising: receiving the first plurality of demodulation reference signals according to a first set of parameters based at least in part on the monitoring and the first plurality of demodulation reference signals failing to maintain phase continuity with the first plurality of demodulation reference signals; and receiving the second plurality of demodulation reference signals according to a second set of parameters based at least in part on the monitoring and the second plurality of demodulation reference signals failing to maintain phase continuity with the first plurality of demodulation reference signals.

Aspect 35: An apparatus for wireless communications at a base station, comprising at least one means for performing a method of any of aspects 11 through 17.

Aspect 37: An apparatus for wireless communications a UE, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of aspects 18 through 25.

Aspect 38: An apparatus for wireless communications a UE, comprising at least one means for performing a method of any of aspects 18 through 25.

Aspect 39: A non-transitory computer-readable medium storing code for wireless communications a UE, the code comprising instructions executable by a processor to perform a method of any of aspects 18 through 25.

Aspect 41: An apparatus for wireless communications at a base station, comprising at least one means for performing a method of any of aspects 26 through 30.