Sidelink shared channel demodulation reference signal configuration scheme

Abstract

Methods, systems, and devices for wireless communications are described. In a first example, a user equipment (UE) may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal (DMRS) pattern. The UE may recognize that, for symbols of the DMRS pattern, each tone in the set of tones is configured to carry a DMRS, and may receive sidelink data transmission based on the symbols of the DMRS pattern carrying the DMRS for each tone. In a second example, the UE may receive control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving a DMRS and a second resource for receiving a phase tracking reference signal. The UE may receive the DMRS on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

Description

[0001] Cross-references

[0002] This patent application claims priority to the following applications: U.S. patent application No. 17 / 244,680, filed by ZEWAIL et al. on April 29, 2021, entitled “SIDELINK SHARED CHANNEL DEMODULATION REFERENCE SIGNALCONFIGURATION SCHEMES”; and U.S. provisional patent application No. 63 / 022,335, filed by ZEWAIL et al. on May 8, 2020, entitled “SIDELINK SHARED CHANNEL DEMODULATION REFERENCE SIGNALCONFIGURATION SCHEMES”; each of the above applications is assigned to the assignee of this application, and each of the above applications is expressly incorporated herein by reference. Technical Field

[0003]

[0013] The following relates generally to wireless communications, and more particularly, to sidelink shared channel demodulation reference signal configuration schemes. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (e.g., long term evolution (LTE) systems, improved LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication for multiple communication devices (which may be referred to as user equipment (UE)).

[0005] In some examples, a first user equipment (UE) may perform sidelink communication with a second UE. For example, the first UE may send sidelink control information (SCI) to the second UE, and the SCI schedules resources for receiving physical sidelink shared channel (PSSCH) transmissions. The first UE may send PSSCH transmissions to the second UE on the scheduled resources. In some cases, the method used by the second UE to receive PSSCH transmissions may suffer performance losses compared to other methods that the second UE may adopt. Summary of the invention

[0006] The described techniques relate to improved methods, systems, devices and apparatuses that support sidelink shared channel demodulation reference signal configuration schemes. In general, the described techniques provide for a user equipment (UE) to receive a sidelink demodulation reference signal (DMRS) on a full-frequency DMRS port. For example, the UE may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a DMRS pattern. The UE may identify that, for a symbol of the DMRS pattern, each tone in the set of tones is configured to carry a DMRS, and may receive a sidelink data transmission based on the symbols of the DMRS pattern carrying a DMRS for each tone.

[0007] In addition, the described techniques can provide for a UE to receive a sidelink DMRS and a sidelink phase tracking reference signal (PTRS) in an overhead-limited manner, where the increased overhead can make the coding loss greater than the performance gain of tracking phase or Doppler. For example, the UE can receive control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving DMRS and a second resource for receiving PTRS. The UE can receive DMRS on the first resource and PTRS on the second resource based on the non-overlapping relationship.

[0008] A method for wireless communication is described. The method may include receiving sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern; identifying that, for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and receiving the sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone.

[0009] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern; identify that: for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and receive a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone.

[0010] Another apparatus for wireless communication is described. The apparatus may include: means for receiving sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern; means for identifying that: for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and means for receiving a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone.

[0011] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern; identify that: for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and receive a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving an indication of a port configuration for receiving a demodulation reference signal; updating aspects of the port configuration; and receiving a demodulation reference signal based on the updated aspects.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, aspects may be updated based on subcarrier spacing, channel delay spread, or both.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for receiving an indication of a modulation and coding scheme, wherein the aspects may be updated based on the modulation and coding scheme.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an aspect may be updated based on a modulation coding scheme having a value above a threshold.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, aspects may also be updated based on subcarrier spacing, channel delay spread, or both.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink control information includes parameters for indicating aspects to be updated.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the parameter includes an index of a table corresponding to the updated aspect, wherein updating the aspect includes selecting the updated aspect from the table according to the index.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a port configuration includes a first port and a second port configured to receive a demodulation reference signal, and wherein the updating aspect includes combining the first port and the second port to form a virtual port, and wherein the demodulation reference signal may be received on the virtual port.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a port configuration includes a first port and a second port, and wherein the updating aspect includes determining to avoid performing code division multiplexing on the first port with the second port when a demodulation reference signal is received on the first port, and wherein the demodulation reference signal may be received on the first port.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a port configuration includes a first port corresponding to a first comb configuration and a second port corresponding to a second comb configuration, wherein the first port can be configured to receive a demodulation reference signal using the first comb configuration and the second port can be configured to receive a demodulation reference signal using the second comb configuration, and wherein the updating aspect includes determining to receive the demodulation reference signal using a single one of the first comb configuration or the second comb configuration.

[0022] In some examples, the port configuration includes a first port and a second port, wherein the updating aspect includes one or more of the following: combining the first port and the second port to form a virtual port, wherein a demodulation reference signal is received on the virtual port; determining to avoid performing code division multiplexing on the first port with a third port when the demodulation reference signal is received on the first port, wherein the demodulation signal is received on the first port; and determining to use a single one of a first comb configuration corresponding to the first port or a second comb configuration corresponding to the second port to receive the demodulation reference signal.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving an indication of a port configured to receive a demodulation reference signal on each tone in a set of tones, wherein the port can be used to receive the demodulation reference signal.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, at least one symbol of a demodulation reference signal pattern may include operations, features, units, or instructions for performing the following operations: identifying a first port associated with a first comb configuration and a second port associated with a second comb configuration; combining the first port and the second port to form a virtual port associated with the first comb configuration and the second comb configuration; receiving a demodulation reference signal in the first symbol on the virtual port using the first comb configuration, wherein receiving the demodulation reference signal in the first symbol may include operations, features, units, or instructions for performing the following operations: avoiding using the second comb configuration to receive the demodulation reference signal; and receiving the demodulation reference signal in the second symbol on the virtual port using the second comb configuration, wherein receiving the demodulation reference signal in the second symbol may include operations, features, units, or instructions for performing the following operations: avoiding using the second comb configuration to receive the demodulation reference signal.

[0025] A method for wireless communication is described. The method may include: sending sidelink control information to a UE, the sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and sending the sidelink data transmission based on at least one symbol of the demodulation reference signal carrying the demodulation reference signal for each tone.

[0026] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to send sidelink control information to a UE, the sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and send the sidelink data transmission based on at least one symbol of the demodulation reference signal carrying the demodulation reference signal for each tone.

[0027] Another apparatus for wireless communication is described. The apparatus may include: means for sending sidelink control information to a UE, the sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and means for sending the sidelink data transmission based on at least one symbol of the demodulation reference signal carrying the demodulation reference signal for each tone.

[0028] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: send sidelink control information to a UE, the sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and send the sidelink data transmission based on at least one symbol of the demodulation reference signal carrying the demodulation reference signal for each tone.

[0029] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: sending an indication of a port configuration for receiving a demodulation reference signal, wherein the sidelink control information includes parameters for indicating aspects of the port configuration for receiving a demodulation reference signal for the UE to update.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the parameter indicates updating the aspect by combining a first port and a second port of a port configuration at the UE to form a virtual port.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates to a UE that an aspect is updated by avoiding code division multiplexing on a first port of a port configuration with a second port of the port configuration when a demodulation reference signal is received on the first port.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates to a UE that an aspect is updated by: receiving a demodulation reference signal using a single one of a first comb configuration associated with a first port of a port configuration or a second comb configuration associated with a second port of the port configuration.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the parameter includes an index of a table corresponding to the updated aspect.

[0034] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for sending an indication to a UE of a port configured to receive a demodulation reference signal on each tone in a set of tones.

[0035] A method for wireless communication is described. The method may include: receiving control signaling for indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal; and receiving the demodulation reference signal on the first resource and receiving the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0036] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal; and receive the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0037] Another apparatus for wireless communication is described. The apparatus may include: a unit for receiving control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal; and a unit for receiving the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0038] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: receive control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal; and receive the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0039] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving control signaling may include operations, features, units, or instructions for performing the following operations: receiving first control signaling indicating a first resource and second control signaling indicating a second resource.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second control signaling includes sidelink control information signaling indicating the second resource.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second control signaling includes medium access control (MAC) control element signaling or radio resource control signaling for indicating the second resource.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving control signaling may include operations, features, units, or instructions for performing the following operations: determining a phase tracking reference signal pattern based on a demodulation reference signal pattern, wherein the phase tracking reference signal pattern indicates a second resource for receiving a phase tracking reference signal.

[0043] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for receiving a configuration of a frequency density for a phase tracking reference signal pattern via radio resource control signaling.

[0044] A method for wireless communication is described. The method may include: determining a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal; sending control signaling indicating a configuration for the non-overlapping relationship; and sending the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0045] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to determine a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal; send control signaling indicating a configuration for the non-overlapping relationship; and send the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0046] Another apparatus for wireless communication is described. The apparatus may include: means for determining a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal; means for sending control signaling indicating a configuration for the non-overlapping relationship; and means for sending the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0047] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: determine a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal; send control signaling indicating a configuration for the non-overlapping relationship; and send the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based on the non-overlapping relationship.

[0048] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending control signaling may include operations, features, units, or instructions for performing the following operations: sending first control signaling for indicating a first resource and second control signaling for indicating a second resource.

[0049] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second control signaling includes sidelink control information signaling indicating the second resource.

[0050] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second control signaling includes medium access control (MAC) control element signaling or radio resource control signaling for indicating the second resource.

[0051] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a non-overlapping relationship may include operations, features, means, or instructions for sending control signaling indicating a demodulation reference signal mode.

[0052] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for transmitting, via radio resource control signaling, a configuration of a frequency density for a phase tracking reference signal pattern. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 An example of a wireless communication system according to aspects of the present disclosure is shown.

[0054] Figure 2A and Figure 2B An example of a wireless communication system according to aspects of the present disclosure is shown.

[0055] Figure 3 Examples of demodulation reference signal patterns in accordance with aspects of the present disclosure are shown.

[0056] Figure 4A and Figure 4B Examples of port configurations according to aspects of the present disclosure are shown.

[0057] Figures 5 to 8 An example of a port configuration update scheme according to aspects of the present disclosure is shown.

[0058] Fig. 9 and Fig.10 An example of a process flow according to aspects of the present disclosure is shown.

[0059] Fig.11 and Fig.12 A block diagram of an apparatus according to aspects of the present disclosure is shown.

[0060] Fig.13 A block diagram of a communications manager is shown in accordance with aspects of the present disclosure.

[0061] Fig.14 A schematic diagram of a system including an apparatus according to aspects of the present disclosure is shown.

[0062] Figures 15 to 19 A flow chart illustrating a method according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0063] A user equipment (UE) may perform sidelink communication in which the UE communicates with another UE. For example, a first UE may send sidelink control information (SCI) to a second UE, the SCI scheduling resources for sidelink data transmission (e.g., physical sidelink shared channel (PSSCH) transmission). The first UE may modulate the sidelink data transmission, and may send the sidelink data transmission on the scheduled resources. In some examples, in order to help the second UE demodulate the modulated sidelink data transmission, the first UE may also send a demodulation reference signal (DMRS) on one or more resources allocated for the sidelink data transmission. The one or more resources on which the DMRS is sent may be referred to as a DMRS pattern.

[0064] When a resource for scheduling a sidelink data transmission has an associated subcarrier spacing (SCS) below a threshold amount (e.g., at or above 960 kHz), the UE may be able to interpolate the frequency domain channel to receive a sufficient amount of DMRS for performing demodulation. For example, some frequency tones of a DMRS symbol may not be configured to carry a DMRS signal, and the UE may interpolate the DMRS signal across these frequency tones. However, as the bandwidth increases, the subcarrier spacing (SCS) may be increased above the threshold amount to support the increased bandwidth. Additionally or alternatively, the SCS may be increased above the threshold amount as a measure to mitigate phase noise. In either case, when the SCS is increased above the threshold amount, the second UE may not be able to perform interpolation with sufficient accuracy to demodulate the sidelink transmission, or may experience reduced performance when demodulating the sidelink data transmission.

[0065] In order to enable the second UE to use the increased SCS while mitigating performance loss, the second UE may identify that, for at least one symbol of the DMRS pattern, the second UE is to receive DMRS on each tone (e.g., subcarrier) in the tone set spanned by the sidelink data transmission. Such a configuration may be referred to as a full-density or full-frequency DMRS configuration. Additionally or alternatively, the second UE may update aspects of the port configuration to form a full-density DMRS configuration, and may receive DMRS according to the updated port configuration. For example, the second UE may combine ports to form a virtual port referred to as a full-frequency DMRS port; may determine that two ports do not undergo code division multiple access (CDM), and may receive DMRS through one of the ports; may determine to use one of the comb configurations in the comb configuration set to receive DMRS; or any combination of these partial configuration update techniques. Such techniques, methods for determining when to use them, and associated control signals may be described in accordance with aspects of the present disclosure.

[0066] In some examples, the first UE may send a phase tracking reference signal (PTRS) to the second UE to help the second UE compensate for phase noise, Doppler shift, or both. In some examples, the PTRS resource may have an associated time density so that the PTRS may be sent after each DMRS symbol. For example, after the first symbol on which the DMRS is sent, the PTRS may be sent on the next symbol and may be sent according to the time density until another DMRS signal on another symbol. When another DMRS signal is sent on another symbol, the PTRS may be sent on the next symbol and may be sent according to the time density until another DMRS signal is received. Executing such a method may result in overhead, which may cause more coding losses than the performance gain obtained from tracking phase or Doppler. Therefore, such a UE may experience performance loss.

[0067] To help mitigate such performance loss, the first UE may schedule PTRS resources and DMRS resources while compensating for the time allocation of each of them. One way the first UE may do this is to send dynamic control signaling (e.g., SCI) or semi-dynamic control messenger (e.g., medium access control (MAC) control element (MAC-CE), radio resource control (RRC) signaling) to indicate the PTRS resources. Alternatively, the first UE may determine a DMRS pattern, and may indicate the DMRS pattern to the second UE. The second UE may determine a PTRS pattern based on the DMRS pattern, the PTRS pattern indicating one or more resources for receiving PTRS and not overlapping with the resources of the DMRS pattern.

[0068] Various aspects of the disclosure are first described in the context of a wireless communication system. Additional aspects of the disclosure are described in the context of additional wireless communication systems, DMRS patterns, port configurations, port configuration update schemes, and process flows. Various aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts related to a sidelink shared channel demodulation reference signal configuration scheme.

[0069] Figure 1An example of a wireless communication system 100 according to aspects of the present disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an improved LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0070] Base stations 105 may be dispersed throughout a geographic area to form wireless communication system 100, and may be devices in different forms or with different capabilities. Base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which UEs 115 and base stations 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographic area over which base stations 105 and UEs 115 may support transmission of signals according to one or more radio access technologies.

[0071] UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, mobile, or both at different times. UEs 115 may be devices in different forms or with different capabilities. Some example UEs 115 are Figure 1 The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0072] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may be connected to the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3 or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or both, over the backhaul links 120 (e.g., via X2, Xn or other interfaces). In some examples, the backhaul links 120 may be or include one or more wireless links.

[0073] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB, evolved NodeB), a next generation NodeB or a Gigabit NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other appropriate terms.

[0074] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a user device, or some other appropriate terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, as well as other examples. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, as well as other examples, which may be implemented in various objects such as appliances, or vehicles, meters, and other examples.

[0075] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network devices (including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples), such as Figure 1 shown.

[0076] The UE 115 and the base station 105 can communicate with each other wirelessly via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources with a defined physical layer structure for supporting the communication link 125. For example, the carrier used for the communication link 125 can include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel can carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating operations for the carrier, user data, or other signaling. The wireless communication system 100 can support communication with the UE 115 using carrier aggregation or multi-carrier operation. According to the carrier aggregation configuration, the UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0077] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate for the UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity for communication with the UE 115.

[0078] The time interval for the base station 105 or the UE 115 may be in a basic time unit (which may be, for example, referred to as T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can indicate the maximum supported subcarrier spacing, and N f The communication resource time intervals may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0079] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of a cyclic prefix prefixed in front of each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0080] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100, and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0081] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by the number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0082] In some examples, the base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for respective geographic coverage areas 110 using the same or different radio access technologies.

[0083] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication, and can be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include prioritization of services, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, critical mission, and ultra-reliable low-latency can be used interchangeably herein.

[0084] In some examples, UE 115 may be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UE 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UE 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, groups of UE 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UE 115 without involving the base station 105.

[0085] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicle can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these items. The vehicle can use signals to send information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, the vehicle in the V2X system can communicate with roadside infrastructure (such as a roadside unit), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or communicate with both.

[0086] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets to an external network or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted via a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0087] Some of the network devices, such as the base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 via one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0088] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Often, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band, because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may be sufficient to penetrate structures for macro cells to provide service to UEs 115 located indoors. Transmissions on UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0089] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) can employ carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be based on a carrier aggregation configuration in combination with component carriers operating in a licensed band (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, as well as other examples.

[0090] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operations or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located at a variety of geographical locations. The base station 105 may have an antenna array having antenna ports of a number of rows and columns that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0091] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to form or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0092] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly for transmission on a logical channel. The medium access control (MAC) layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also support retransmission at the MAC layer using error detection techniques, error correction techniques, or both to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection that supports radio bearers for user plane data between UE 115 and base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0093] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems can be multiple access systems that can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless network (e.g., a wireless local area network (WLAN), such as a Wi-Fi (i.e., an Institute of Electrical and Electronics Engineers (IEEE) 802.11) network) may include an access point (AP) that can communicate with one or more wireless or mobile devices. The AP can be coupled to a network such as the Internet, and can enable mobile devices to communicate via the network (or communicate with other devices coupled to the access point). A wireless device can communicate bidirectionally with a network device. For example, in a WLAN, a device can communicate with an associated AP via a downlink (e.g., a communication link from an AP to a device) and an uplink (e.g., a communication link from a device to an AP). A wireless personal area network (PAN) (which may include a Bluetooth connection) can provide for short-range wireless connections between two or more paired wireless devices. For example, a wireless device such as a cellular phone can utilize wireless PAN communication to exchange information such as audio signals with a wireless headset.

[0094] In general, the described techniques prepare for UE 115 to receive sidelink DMRS over a full frequency DMRS port. For example, UE 115 may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a DMRS pattern. UE 115 may recognize that, for a symbol of the DMRS pattern, each tone in the set of tones is configured to carry DMRS, and may receive a sidelink data transmission based on the symbols of the DMRS pattern carrying the DMRS for each tone.

[0095] In addition, the described techniques can provide for UE 115 to receive a sidelink DMRS and a sidelink phase tracking reference signal (PTRS) in non-overlapping resources. For example, UE 115 can receive control signaling indicating a first resource for receiving DMRS and a second resource for receiving PTRS, wherein the first resource is non-overlapping with the second resource. UE 115 can receive DMRS on the first resource and PTRS on the second resource based on the first resource being non-overlapping with the second resource in time.

[0096] Figure 2A and Figure 2B Examples of wireless communication systems 200-a and 200-b according to aspects of the present disclosure are shown. In some examples, the wireless communication systems 200-a and 200-b can implement aspects of the wireless communication system 100. For example, UEs 115-a, 115-b, 115-c, and 115-d can be as described with reference to Figure 1 An example of UE 115 is described.

[0097] exist Figure 2A In some examples, UE 115-a may perform sidelink communication in which UE 115-a communicates with another UE 115-b. For example, UE 115-a may send an SCI 205 to UE 115-b, and SCI 205 schedules data resources 212 and one or more resources 215 for a sidelink data transmission 210 (e.g., a PSSCH transmission). UE 115-a may modulate the sidelink data transmission 210 before transmission, and may send the sidelink data transmission 210 on the scheduled data resources 212. In some examples, to assist UE 115-b in demodulating the modulated sidelink data transmission, UE 115-a may also send a DMRS on one or more resources 215 (e.g., DMRS resources 215-a and 215-b) allocated for the sidelink data transmission. One or more DMRS resources 215 may be collectively referred to as a DMRS pattern. SCI 205 may include priority information (e.g., a quality of service (QoS) value), PSSCH resource assignments (e.g., frequency or time resources used for PSSCH), resource reservation period (e.g., if enabled), PSSCH DMRS mode (e.g., if more than one mode is configured or pre-configured), a second SCI format (e.g., information about the size of the second SCI), a 2-bit beta offset for second stage control resource allocation, the number of PSSCH DMRS ports (e.g., 1 or 2), a 5-bit modulation and coding scheme (MCS), and one or more reserved bits.

[0098] Each of the data resources 212 and the DMRS resources 215 may span a number of tones 225 and a number of symbols 230. For example, in this example, the sidelink data transmission may be allocated 12 tones 255 and 12 symbols 230. The data resources 212 may span 10 of the allocated symbols 230 and may each span multiple tones 225. Likewise, the DMRS resources 215-a and 215-b may each span a single symbol 230 and may span multiple tones 225.

[0099] When the DMRS resources 215 have an associated subcarrier spacing (SCS) below a threshold amount (e.g., at or above 960 kHz), some of the tones 225 of each DMRS resource 215 may be used for a first port to receive DMRS, and other tones 255 may be used for a second port (e.g., of another UE 115) to receive DMRS. Although some tones 225 may be used for the first port and other tones 255 may be used for the second port, the UE 115-b may be able to interpolate the frequency domain channel so that the two ports may be used independently to perform demodulation. However, as bandwidth increases (e.g., to 2 GHz or greater), the SCS may increase above the threshold amount to support the expanded bandwidth when the Fast Fourier Transform (FFT) size is below the threshold amount. Additionally or alternatively, the SCS may be increased above the threshold amount as a measure to mitigate phase noise. In either case, when the SCS increases above the threshold amount, constraints on the coherent bandwidth may increase. Additionally, UE 115 - b may be unable to perform interpolation with sufficient accuracy to demodulate sidelink data transmission 210 .

[0100] In order to enable UE 115-b to use the increased SCS while reducing performance loss, UE 115-b may update one or more aspects of the port configuration. For example, UE 115-b may identify that, for at least one symbol of the DMRS pattern, UE 115-b is to receive DMRS on each tone 225 (e.g., subcarrier) in the set of tones spanned by the sidelink data transmission 210. For example, UE 115-b may determine that UE 115-b is to receive DMRS on each tone 225 included in the DMRS resources 215-a or 215-b in their spans. Such a configuration may be referred to as a full-density or full-frequency DMRS configuration. Additionally or alternatively, if DMRS is received on two layers, UE 115-b may determine that the ports of each layer are not code division multiplexed together. Instead, one layer may be received on a first comb and a second layer may be received on a second comb. An example of a comb may be referenced to Figure 4A and / or Figure 4BIn some examples, two or more of these aspects may be updated together. For example, UE 115-a may use a full-density DMRS configuration for one layer and determine that the full-density DMR configuration for one layer is not code-division multiplexed with ports of another layer.

[0101] Some examples of various aspects of updating port configurations are described herein. For example, the present disclosure may describe techniques for implementing the construction and use of full-frequency DMRS ports (e.g., in Figure 5 The present disclosure may describe techniques by which UE 115 may receive DMRS using ports not in a CDM group when two layers are used (e.g., Figure 6 The present disclosure may describe an indication of whether a comb in a comb set is available for use (e.g., in Figure 7 The present disclosure may describe techniques by which different DMRS ports may be used on different symbols (e.g., Figure 8 middle).

[0102] UE 115-b may employ one or more methods to determine when to update aspects of the port configuration. For example, UE 115-b may be pre-configured or configured (e.g., configured via RRC, signaled or activated via SCI, or activated via MAC-CE) to define a full-frequency DMRS port by combining two ports into one port. Additionally or alternatively, UE 115-b is pre-configured to determine that there are no ports via CDM when configured with rank 2. Additionally or alternatively, UE 115-b may be assigned a single port associated with a first comb, and the second comb may not be used because the second comb may be used by another UE 115 (e.g., for receiving DMRS). For example, UE 115-b may have a first port and a rank of 1, while another UE 115 may have a full-frequency port and a rank of 2.

[0103] Additionally or alternatively, UE 115-b may determine to update aspects of the port configuration based on the SCS and a delay spread of a channel (e.g., a channel carrying sidelink data transmission 210). Additionally or alternatively, if the MCS is above a threshold value, UE 115-b may determine to update aspects of the port configuration (e.g., use a port with a higher frequency density, determine that two ports are not CDMed, or determine to use a single comb configuration). The performance of an MCS above a threshold value may be more sensitive to channel estimation errors. As such, UE 115-b may update aspects of the port configuration when the MCS is above a threshold value.

[0104] Additionally or alternatively, a table may be defined for PSSCH DMRS parameters to indicate the updated aspects. For example, a table may indicate which ports may be assigned to UE 115-b and which ports may not exist. Additionally or alternatively, a table may indicate whether multiple ports are to be combined into a virtual port. Such a table may include information about the time domain allocation of DMRS. The allocated index may be communicated via SCI 205, by another SCI, or by other control signaling.

[0105] Additionally or alternatively, the SCI 205 may include one or more bits to indicate that an aspect is updated. For example, for rank 1, the SCI 205 may indicate that two ports may be combined into a single port. Additionally or alternatively, when scheduled with a single port, the SCI 205 may include an indication of whether another comb is used (e.g., a comb associated with a different port). For rank 2, the SCI 205 may indicate that there are no ports that are CDMed. Additionally or alternatively, a new configuration formed by ports with full frequency density may be defined.

[0106] In certain applications (e.g., V2X), more than one DMRS resource 215 (e.g., and therefore, more than one DMRS symbol) may be included. As such, different CDM groups may be used in different symbols, which may enable denser coverage in the frequency domain. For example, for a first configuration type, a first port may be transmitted on a first DMRS resource 215-a (e.g., a first DMRS symbol), and a second DMRS port may be transmitted on a second DMRS resource 215-b (e.g., a second DMRS symbol). Thus, each resource element (RE) may be covered in the frequency domain by a combination of two ports. A preconfigured DMRS pattern sequence or DMRS table for indicating which port to transmit in each symbol may be used to indicate a change in pattern from one symbol to another.

[0107] exist Figure 2BIn some examples, UE 115-c may send (e.g., in a high frequency band) a phase tracking reference signal (PTRS) to UE 115-d to help UE 115-d compensate for phase noise, Doppler shift, or both. Similarly, in certain scenarios (e.g., V2X communications), multiple DMRS resources may be used to compensate for Doppler shift and / or track phase noise. Typically, PTRS signals may be of lower density in the frequency domain (e.g., there may be one signal every 1, 2, or 4 resource blocks (RBs)), which may result in less overhead than DMRS signals. Thus, dynamic indication may not occur for PTRS, and the DMRS pattern may change from time slot to time slot (e.g., based on the SCI). In some such examples, a certain level of overhead may occur between DMRS and PTRS, such that performance degradation may occur.

[0108] To help mitigate such performance loss, the UE 115-c may dynamically (e.g., via SCI) or semi-dynamically (e.g., via MAC-CE or RRC) change the PTRS resources based on the DMRS resources 215 (e.g., DMRS resources 215-c and 215-d) such that the PTRS resources 220 do not overlap with the DMRS resources (e.g., in time, frequency, or both). One method by which the UE 115-c may do this is to provide a dynamic indication of the PTRS in the SCI. In such a case, the UE 115-c may define an allocation table and the index of the row may be communicated via the SCI. The frequency density for the PTRS may be the same as the previously configured frequency density (e.g., configured in a previous RRC configuration), but the time allocation may change dynamically. Another method by which the UE 115-c may indicate non-overlapping DMRS-PTRS resources may be for the UE 115-c to perform a semi-dynamic change by indicating the PTRS mode in RRC or MAC-CE signaling.

[0109] Yet another method may involve UE 115-c dynamically binding DMRS and PTRS configurations. For example, UE 115-c may determine a DMRS pattern (e.g., including DMRS resources 215-c and 215-d), and may indicate the DMRS pattern to UE 115-d. UE 115-d may determine, based on the DMRS pattern, an associated PTRS pattern indicating one or more resources 220 for receiving PTRS and that do not overlap with the resources of the DMRS pattern. In some cases, UE 115-c may send RRC signaling (e.g., providing an RRC configuration) to indicate a PTRS frequency density.

[0110] The techniques described herein may have one or more advantages. By using full-frequency DMRS ports, UE 115-b may use increased SCS while mitigating the performance penalty associated with performing interpolation. Additionally or alternatively, by receiving a dynamic or semi-dynamic indication of PTRS, UE 115-d may experience less overhead in determining a PTRS resource on which to receive PTRS.

[0111] Figure 3 Examples of DMRS patterns 300-a, 300-b, 300-c, 300-d, and 300-e according to aspects of the present disclosure are shown. In some examples, the DMRS patterns 300-a, 300-b, 300-c, 300-d, and 300-e can be implemented by aspects of the wireless communication system 100 and / or 200. For example, the DMRS patterns 300-a, 300-b, 300-c, 300-d, and 300-e can represent the DMRS patterns used for the wireless communication system 100 and / or 200. Figure 2A An allocation of received sidelink data transmission 210 is described.

[0112] Each DMRS pattern 300 may include data resources 305 and DMRS resources 310, which may be respectively as shown in FIG. Figure 2A or Figure 2B Examples of data resources 212 and DMRS resources 215 are described. Two-symbol DMRS patterns (e.g., DMRS patterns 300-a and 300-d), three-symbol DMRS patterns (e.g., DMRS patterns 300-b and 300-e), and four-symbol DMRS patterns (e.g., DMRS pattern 300-c) can be configured for use by a transmitting UE 115. The transmitting UE 115 can select a DMRS time pattern based on channel conditions, and the DMRS time pattern can be signaled to the receiving UE 115 (e.g., via SCI). DMRS patterns 300-a, 300-b, and 300-c can represent patterns for a 12-symbol PSSCH, and DMRS patterns 300-d and 300-e can represent patterns for a 9-symbol PSSCH, although it should be noted that DMRS patterns for other PSSCH lengths can also be defined.

[0113] One and two layer transmission can be supported using quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64-QAM, and 256-QAM. For one layer transmission, a single port can be used. For two layer transmission, two ports on one comb can be used using CDM. Another comb can be used for data transmission. An example of a comb can be referenced Figure 4A and Figure 4BIn some examples, UE 115 can be configured to update one or more aspects of the port configuration associated with DMRS pattern 300 to receive DMRS signaling according to a full density or full frequency configuration, such as with respect to Figure 5 Described in more detail.

[0114] Figure 4A and Figure 4B Examples of port configurations 400-a and 400-b according to aspects of the present disclosure are shown. In some examples, port configurations 400-a and 400-b can implement aspects of wireless communication system 200 and / or DMRS patterns 300-a, 300-b, 300-c, 300-d, and 300-e. For example, port configurations 400-a and 400-b can represent as described with reference to Figure 2A and 2B DMRS resource 215 as described or as referenced Figure 3 The configuration of ports on the DMRS resource 310 is described.

[0115] like Figure 4A As shown, UE 115 may receive a DMRS for sidelink data transmission on symbol 407-a of at least one of layer grids 402-a and 402-b. Layer grids 402-a and 402-b may indicate a DMRS for a respective layer and allocated for receiving sidelink data transmission (e.g., as shown in FIG. 1 ). Figure 2A 402-a and 402-b). The DMRS transmission may be referred to as a one-layer DMRS transmission if the UE 115 receives the DMRS on one of the layer grids 402-a or 402-b. The DMRS transmission may be referred to as a two-layer DMRS transmission if the UE 115 receives the DMRS on both layer grids 402-a and 402-b.

[0116] In layer grid 402-a, UE 115 may receive DMRS on a first set of tones 412 for port 405 or a second set of tones 412 for port 410. The first set of tones 412 and the second set of tones 412 may be arranged such that each tone 412 in the first set of tones 412 is directly adjacent to a tone 412 in the second set of tones 412. As such, the first set of tones may be referred to as being in a first comb configuration, and the second set of tones may be referred to as being in a second comb configuration, wherein the first set of comb configurations and the second set of comb configurations span the total set of tones in layer grid 402-a. Similarly, in layer grid 402-b, UE 115 may receive DMRS on a third set of tones 412 for port 415 or a fourth set of tones 412 for port 420. The third set of tones 412 and the fourth set of tones 412 may be arranged such that each tone in the third set of tones 412 is directly adjacent to a tone 412 in the fourth set of tones 412. As such, the third set of tones may be referred to as being in a third comb configuration, and the fourth set of tones may be referred to as being in a fourth comb configuration.

[0117] Layer grids 402-a and 402-b may span the same set of symbols 407 and tones 412. As such, a first set of tones for port 405 may overlap with a third set of tones 412 for port 415, and a second set of tones for port 410 may overlap with a fourth set of tones 412 for port 420, in time and frequency. Thus, ports 405 and 415 may be referred to as being in a first CDM group, and ports 410 and 420 may be referred to as being in a second CDM group. When UE 115 receives a two-layer DMRS transmission, port 405 may be CDM-ed with port 415, and port 410 may be CDM-ed with port 420.

[0118] like Figure 4B As shown, UE 115 can receive DMRS for sidelink data transmission on two symbols 407-b and 407-c of at least one of layer grids 402-c, 402-d, 402-e and 402-f. If UE 115 receives DMRS on one of layer grids 402-c, 402-d, 402-e and 402-f, the DMRS transmission can be referred to as a layer of DMRS transmission. If UE 115 receives DMRS on two layer grids in layer grid 402, three layer grids in layer grid 402, or all four layer grids 402, the DMRS transmission can be referred to as two-layer DMRS transmission, three-layer DMRS transmission, or four-layer DMRS transmission, respectively.

[0119] In layer grid 402-c, UE 115 may receive DMRS on a first set of tones 412 for port 405 or a second set of tones 412 for port 410. The first set of tones 412 and the second set of tones 412 may be arranged such that each tone 412 in the first set of tones 412 is directly adjacent to a tone 412 in the second set of tones 412. As such, the first set of tones may be referred to as being in a first comb configuration, and the second set of tones may be referred to as being in a second comb configuration, wherein the first set of comb configurations and the second set of comb configurations span the total set of tones in layer grid 402-b. Similarly, in layer grid 402-d, UE 115 may receive DMRS on a third set of tones 412 for port 415 or a fourth set of tones 412 for port 420. The third set of tones 412 and the fourth set of tones 412 may be arranged such that each tone in the third set of tones 412 is directly adjacent to a tone 412 in the fourth set of tones 412. As such, the third set of tones may be referred to as being in a third comb configuration, and the fourth set of tones may be referred to as being in a fourth comb configuration.

[0120] Similarly, in layer grid 402-e, UE 115 may receive DMRS on a fifth set of tones 412 for port 425 or a sixth set of tones 412 for port 430. The fifth set of tones 412 and the sixth set of tones 412 may be arranged such that each tone in the fifth set of tones 412 is directly adjacent to a tone 412 in the sixth set of tones 412. As such, the fifth set of tones may be referred to as being in a fifth comb configuration, and the sixth set of tones may be referred to as being in a sixth comb configuration. Similarly, in layer grid 402-f, UE 115 may receive DMRS on a seventh set of tones 412 for port 435 or an eighth set of tones 412 for port 440. The seventh set of tones 412 and the eighth set of tones 412 may be arranged such that each tone in the seventh set of tones 412 is directly adjacent to a tone 412 in the eighth set of tones 412. As such, the seventh set of tones 412 may be referred to as being in a seventh comb configuration, and the eighth set of tones 412 may be referred to as being in an eighth comb configuration.

[0121] Layer grids 402-c, 402-d, 402-e, and 402-f may span the same set of symbols 407 and tones 412. As such, a first set of tones for port 405 may overlap in time and frequency with a third set of tones 412 for port 415, a fifth set of tones 412 for port 425, and a seventh set of tones 412 for port 435. Likewise, a second set of tones for port 410, a fourth set of tones for port 420, a sixth set of tones for port 430, and an eighth set of tones for port 440 may overlap together in time and frequency. Thus, ports 405, 415, 425, and 435 may be referred to as being in a first CDM group, and ports 410, 420, 430, and 440 may be referred to as being in a second CDM group. When UE 115 receives two layers of DMRS transmissions, one port of the first CDM group may be CDMed with another port of the first CDM group, and one port of the second CDM group may be CDMed with another port of the second CDM group. For example, port 405 may be CDMed with port 415, and port 410 may be CDMed with port 420. Typically, the patterns of port configurations may be orthogonal in a 2 by 2 frequency-time resource element (RE) set. If a DMRS port is scheduled for UE 115 and a co-scheduled UE 115 is served on the same CDM group, PTRS may not be present for UE 115 receiving PSSCH. In some examples, UE 115 may be configured to update one or more aspects of port configuration 400-a or 400-b to receive DMRS signaling according to a full density or full frequency configuration, such as with respect to Figure 5 Described in more detail.

[0122] Figure 5 An example of a port configuration update scheme 500 according to aspects of the present disclosure is shown. In some examples, the port configuration update scheme 500 can implement aspects of the wireless communication system 100 and / or 200 and / or the port configuration 400-a and / or 400-b. For example, the layer grid 502 can be as described with reference to Figure 4A and / or Figure 4B An example of a layer grid 402 is depicted.

[0123] Initially, the UE 115 may be configured with a port configuration in the layer grid 502 that includes a first port 505 associated with a first set of tones 520 in a symbol 525 and a second port 510 associated with a second set of tones 520 in the symbol 525. In some cases, the UE 115 may determine to update the port configuration (e.g., as described in reference to Figure 2A and 2BIn such a case, the UE 115 may combine the first port 505 and the second port 510 to form a virtual port 515. The virtual port 511 may span each tone in the tones 520 of the layer grid 502, and thus may be referred to as a full frequency port. The UE 115 may use the full frequency port to receive the DMRS transmission.

[0124] Figure 6 An example of a port configuration update scheme 600 according to aspects of the present disclosure is shown. In some examples, the port configuration update scheme 600 can implement aspects of the wireless communication system 100 and / or 200 and / or the port configuration 400-a and / or 400-b. For example, the layer grids 602-a and 602-b can be as described with reference to Figure 4A and / or Figure 4B An example of a layer grid 402 overlapping in time and frequency is depicted.

[0125] Initially, the UE 115 may be configured with a port configuration in the layer grid 602-a that includes a first port 605 associated with a first set of tones 625 in a symbol 630 and a second port 610 associated with a second set of tones 625 in the symbol 630. Additionally, the UE 115 may be configured with a port configuration in the layer grid 602-b that includes a third port 615 associated with a third set of tones 625 in the symbol 630 and a fourth port 620 associated with a fourth set of tones 625 in the symbol 630. The first port 605 and the third port 615 may form a first CDM group, and the second port 610 and the fourth port 620 may form a second CDM group.

[0126] In some cases, UE 115 may determine to update the port configuration (e.g., as described in Figure 2A and 2B In such a case, the UE 115 may determine that the first port 605 will not be CDMed with the third port 615 and / or the second port 610 will not be CDMed with the fourth port 620. Therefore, the UE 115 may not use the third port 615 and / or the fourth port 620 when receiving the DMRS transmission (e.g., the UE 115 may use at least one of the first port 605 and the second port 610).

[0127] Figure 7 An example of a port configuration update scheme 700 according to aspects of the present disclosure is shown. In some examples, the port configuration update scheme 700 can implement aspects of the wireless communication system 100 and / or 200 and / or the port configuration 400-a and / or 400-b. For example, the layer grid 702 can be as described with reference to Figure 4A and / or Figure 4B An example of a layer grid 402 is depicted.

[0128] Initially, the UE 115 may be configured with a port configuration in the layer grid 702 that includes a first port 705 associated with a first set of tones 715 in a symbol 720 and a second port 710 associated with a second set of tones 715 in the symbol 720. The first set of tones 715 may be referred to as a first comb configuration, and the second set of tones 715 may be referred to as a second comb configuration.

[0129] In some cases, UE 115 may determine to update the port configuration (e.g., as described in Figure 2A and 2B ). In such a case, UE 115 may select one of the comb configurations (e.g., the first comb configuration) for receiving DMRS. Another comb configuration (e.g., the second comb configuration) may be used by another UE 115 to receive DMRS. UE 115 may receive DMRS transmission using the selected comb configuration.

[0130] Figure 8 An example of a port configuration update scheme 800 according to aspects of the present disclosure is shown. In some examples, the port configuration update scheme 800 can implement aspects of the wireless communication system 100 and / or 200 and / or the port configuration 400-a and / or 400-b. For example, the layer grid 802 can be as described with reference to Figure 4A and / or Figure 4B An example of a layer grid 402 is depicted.

[0131] Initially, the UE 115 may be configured with a port configuration in the layer grid 802 that includes a first port 805 associated with a first set of tones 815 in the symbol 820-a and a second port 810 associated with a second set of tones 815 in the symbols 820-a and 820-b. The first set of tones 815 may be referred to as a first comb configuration, and the second set of tones 815 may be referred to as a second comb configuration.

[0132] In some cases, UE 115 may determine to update the port configuration (e.g., as described in Figure 2A and 2B). In such a case, the UE 115 may combine the first port 805 and the second port 810 into a virtual port 812. After performing the combination, the UE 115 may select one of the comb configurations (e.g., the first comb configuration) to be used for receiving the DMRS on the virtual port 812 in the first symbol 820-a. In the first symbol 820-a, another comb configuration (e.g., the second comb configuration) may be used to receive data or may be used by another UE 115 to receive the DMRS. In the second symbol 820-b, the UE 115 may use another comb configuration (e.g., the second comb configuration) to receive the DMRS. In the second symbol 820-b, the UE 115 may use the comb configuration (e.g., the first comb configuration) selected for the first symbol 820-a to receive data. Alternatively, the comb configuration selected for the first symbol 820-a may be used by another UE 115 to receive the DMRS. The UE 115 may receive the DMRS using a comb configuration selected for the first symbol 820-a and another comb configuration selected for the second symbol 820-b. Thus, the virtual port 812 may function as a full-frequency DMRS port.

[0133] Fig. 9 900 according to aspects of the present disclosure. In some examples, the process flow 900 can implement aspects of the wireless communication system 100. For example, the UEs 115-e and 115-f can be as described with reference to Figure 1 An example of UE 115 is described.

[0134] At 905, UE 115-f may send an indication of a port configuration for receiving a demodulation reference signal. UE 115-e may receive an indication of the port configuration. In some examples, at 905, UE 115-f may receive an indication of a port configured to receive DMRS on each tone in a set of tones (e.g., a full-frequency DMRS port).

[0135] At 910, UE 115-f may send an SCI scheduling for sidelink data transmission (eg, PSSCH transmission) across a set of tones and indicating a DMRS pattern. UE 115-e may receive the SCI.

[0136] At 915, the UE 115-e may identify that, for at least one symbol of the DMRS pattern, each tone in the set of tones is configured to carry a DMRS. In some examples, the at least one symbol of the DMRS pattern includes a first symbol and a second symbol.

[0137] At 920, the UE 115-e may update aspects of the port configuration. In some examples, the port configuration may include a first port and a second port configured to receive a DMRS, and the updating aspects may involve combining the first port with the second port to form a virtual port on which the DMRS is to be received. Additionally or alternatively, the port configuration may include a first port and a third port, wherein the updating aspects may involve determining that when the DMRS is received on the first port, the first port will not be CDMed with the second port. Additionally or alternatively, the first port may be associated with a first comb configuration, and the second port may be configured with a second comb configuration, wherein the first port is configured to receive the DMRS using the first comb configuration and the second port is configured to receive the DMRS using the second comb configuration. In such a case, the updating aspects may involve determining to receive the DMRS using a single one of the first comb configuration or the second comb configuration. Additionally or alternatively, the updating aspects may involve combining the first port and the second port to form a virtual port associated with the first comb configuration and the second comb configuration.

[0138] UE 115-e may update aspects based on the SCS, channel delay spread, or both. Additionally or alternatively, UE 115-e may update aspects based on an MCS received by UE 115-e. For example, if the MCS has a value above a threshold value, UE 115-e may update aspects. In some examples, the SCI (e.g., the SCI sent at 910) may include parameters for indicating aspects to be updated. The parameters may include an index of a table corresponding to the updated aspects. In such a case, updating the aspects may involve selecting the updated aspects from the table according to the index.

[0139] At 925, UE 115-f may send a sidelink data transmission based on at least one symbol of the DMRS pattern carrying a DMRS for each tone.

[0140] At 930, the UE 115-f may send a DMRS based on the updated aspects (e.g., the aspects updated at 920). If the updated aspects involve combining a first DMRS port and a second DMRS port, the DMRS may be received on a virtual port. If the updated aspects involve determining that the first port and the third port will not be CDMed, the DMRS may be received on the first port. If the updated aspects involve determining to use a single one of the first comb configuration or the second comb configuration, the UE 115-e may receive the DMRS using a single comb configuration of the first comb configuration or one of the second comb configurations. In an example where the UE 115-e receives an indication of a port configured to receive DMRS on each tone in a set of tones, the UE 115-e may receive the DMRS using the port.

[0141] In the case where UE 115-e combines the first port and the second port associated with the first comb configuration and the second comb configuration, UE 115-e can use the first comb configuration to receive the DMRS in the first symbol on the virtual port. In such a case, receiving the DMRS in the first symbol can involve avoiding receiving the DMRS using the second comb configuration. Similarly, UE 115-e can use the second comb configuration to receive the DMRS in the second symbol on the virtual port. In such a case, receiving the DMRS in the second symbol can involve avoiding receiving the DMRS using the second comb configuration.

[0142] Fig.10 1000 according to aspects of the present disclosure. In some examples, the process flow 1000 can implement aspects of the wireless communication system 100. For example, the UEs 115-g and 115-h can be as described with reference to Figure 1 An example of UE 115 is described.

[0143] At 1005, the UE 115-h may determine a non-overlapping relationship between a first resource for a DMRS and a second resource for a PTRS. In some aspects, determining the non-overlapping relationship may involve determining a DMRS pattern of a DMRS associated with a PTRS pattern. The DMRS pattern may indicate the first resource, and the PTRS pattern may indicate the second resource.

[0144] At 1010, UE 115-h may send control signaling for indicating a configuration for a non-overlapping relationship. In some aspects, the control signaling may include a first control signaling for indicating a first resource and a second control signaling for indicating a second resource. The first control signaling and the second control signaling may indicate that the first resource and the second resource are in a non-overlapping relationship due to the selection of the resource by UE 115-h. In such a case, the second control signaling may include SCI signaling for indicating the second resource. Alternatively, the second control signaling may include MAC-CE signaling or RRC signaling for indicating the second resource. UE115-g may receive the control signaling. In the case where UE 115-h determines the DMRS mode, the control signaling may indicate the DMRS mode.

[0145] At 1015, UE 115-h may send a configuration of a frequency density for PTRS via RRC signaling. UE 115-g may receive a configuration of a frequency density for PTRS via RRC signaling.

[0146] At 1020, the UE 115-g may determine a first resource based on the DMRS pattern. Additionally, the UE 115-g may determine a PTRS pattern based on the DMRS pattern, wherein the PTRS pattern indicates a second resource for receiving the PTRS.

[0147] At 1025, the UE 115-h may send a DMRS on the first resource based on the non-overlapping relationship.

[0148] At 1030 , the UE 115 - h may send a PTRS on the second resource based on the non-overlapping relationship.

[0149] Fig.11 A block diagram 1100 of a device 1105 is shown in accordance with aspects of the present disclosure. The device 1105 may be an example of aspects of a UE 115 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1120. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0150] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to a sidelink shared channel demodulation reference signal configuration scheme, etc.). The information may be communicated to other components of the device 1105. The receiver 1110 may be a reference Fig.14 Examples of various aspects of the transceiver 1415 are described. The receiver 1110 may utilize a single antenna or a group of antennas.

[0151] The communications manager 1115 may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern, recognize that: for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and receive the sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone. The communications manager 1115 may also send sidelink control information to the UE that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; and send the sidelink data transmission based on at least one symbol of the demodulation reference signal carrying a demodulation reference signal for each tone. By identifying that each tone in the set of tones is configured to carry a demodulation reference signal for at least one symbol of a demodulation reference signal pattern, the device 1105 may be able to use an increased SCS while mitigating the performance loss associated with performing interpolation at the increased SCS.

[0152] The communication manager 1115 may also receive control signaling for indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal; and receive a demodulation reference signal on the first resource and receive a phase tracking reference signal on the second resource based on the non-overlapping relationship. The communication manager 1115 may also determine a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal; send control signaling for indicating a configuration for a non-overlapping relationship; and send a demodulation reference signal on the first resource and send a phase tracking reference signal on the second resource based on the non-overlapping relationship. By receiving a configuration for a non-overlapping relationship, the device 1105 may experience less overhead when determining the second resource. The communication manager 1115 may be an example of various aspects of the communication manager 1410 described herein.

[0153] By including or configuring the communication manager 1115 according to examples as described herein, the device 1105 (e.g., a processor controlling or otherwise coupled to the receiver 1110, the transmitter 1120, the communication manager 1115, or a combination thereof) can support techniques for the communication manager 1115 to use full-frequency DMRS ports, which can enable the device 1105 to use increased SCS while mitigating the performance loss associated with performing interpolation. In addition, the device 1105 can support techniques for the communication manager 1115 to transmit dynamic or semi-dynamic indications of PTRS, which can be associated with less overhead than other methods by which the device 1105 can determine the PTRS resources on which to transmit PTRS.

[0154] The communication manager 1115 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1115 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0155] The communication manager 1115 or its subcomponents can be physically located at various locations, including being distributed so that parts of the functions are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1115 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1115 or its subcomponents can be combined with one or more other hardware components (including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof).

[0156] The transmitter 1120 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1120 may be co-located with the receiver 1110 in a transceiver module. For example, the transmitter 1120 may be a reference Fig.14 Examples of various aspects of the transceiver 1415 are described. The transmitter 1120 may utilize a single antenna or a group of antennas.

[0157] Fig.12A block diagram 1200 of a device 1205 is shown in accordance with aspects of the present disclosure. The device 1205 may be an example of aspects of the device 1105 or UE 115 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1250. The device 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0158] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to a sidelink shared channel demodulation reference signal configuration scheme, etc.). The information may be communicated to other components of the device 1205. The receiver 1210 may be a reference Fig.14 Examples of various aspects of the transceiver 1415 are described. The receiver 1210 may utilize a single antenna or a group of antennas.

[0159] The communication manager 1215 may be an example of aspects of the communication manager 1115 as described herein. The communication manager 1215 may include an SCI component 1220, a full frequency component 1225, a sidelink data transmission component 1230, a reference signal component 1235, a control signaling component 1240, and a relationship determination component 1245. The communication manager 1215 may be an example of aspects of the communication manager 1410 as described herein.

[0160] The SCI component 1220 may receive sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern. The SCI component 1220 may send sidelink control information to the UE scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal.

[0161] The full frequency component 1225 may identify that each tone in the set of tones is configured to carry a demodulation reference signal for at least one symbol of a demodulation reference signal pattern. By identifying that each tone in the set of tones is configured to carry a demodulation reference signal for at least one symbol of a demodulation reference signal pattern, the full frequency component 1225 may be able to use an increased SCS while mitigating the performance loss associated with performing interpolation at the increased SCS.

[0162] Sidelink data transmission component 1230 may receive a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone. Sidelink data transmission component 1230 may send a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone.

[0163] The reference signal component 1235 can receive a demodulation reference signal on the first resource and a phase tracking reference signal on the second resource based on a non-overlapping relationship between the first resource and the second resource. The reference signal component 1235 can send a demodulation reference signal on the first resource and a phase tracking reference signal on the second resource based on a non-overlapping relationship between the first resource and the second resource.

[0164] The control signaling component 1240 may receive control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal. The control signaling component 1240 may send control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal. By receiving the configuration for the non-overlapping relationship, the control signaling component 1240 may experience less overhead in determining the second resource.

[0165] The relationship determining component 1245 can determine a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal.

[0166] The transmitter 1250 may transmit signals generated by other components of the device 1205. In some examples, the transmitter 1250 may be co-located with the receiver 1210 in a transceiver module. For example, the transmitter 1250 may be a reference Fig.14 Examples of various aspects of the transceiver 1415 are described. The transmitter 1250 may utilize a single antenna or a group of antennas.

[0167] Fig.13A block diagram 1300 of a communication manager 1305 is shown in accordance with aspects of the present disclosure. The communication manager 1305 may be an example of aspects of the communication manager 1115, the communication manager 1215, or the communication manager 1410 described herein. The communication manager 1305 may include an SCI component 1310, a full frequency component 1315, a sidelink data transmission component 1320, a reference signal component 1325, a port configuration component 1330, an MCS receiver 1335, a control signal component 1340, a PTRS mode component 1345, a frequency density configuration component 1350, and a relationship determination component 1355. Each of these modules may be in communication with each other directly or indirectly (e.g., via one or more buses).

[0168] The SCI component 1310 may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern. In some examples, the SCI component 1310 may send sidelink control information to the UE that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern, wherein, for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal. In some cases, the sidelink control information includes parameters indicating aspects to be updated. The parameters may include an index of a table corresponding to the updated aspects of the port configuration, wherein updating the aspects involves selecting the updated aspects from the table according to the index.

[0169] The full frequency component 1315 can identify that for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal. By identifying that for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal, the full frequency component 1315 may be able to use an increased SCS while mitigating a performance loss associated with performing interpolation at the increased SCS.

[0170] Sidelink data transmission component 1320 can receive a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone. In some examples, sidelink data transmission component 1320 can send a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone.

[0171] The reference signal component 1325 may receive a demodulation reference signal on the first resource and a phase tracking reference signal on the second resource based on a non-overlapping relationship between the first resource and the second resource. In some examples, the reference signal component 1325 may send a demodulation reference signal on the first resource and send a phase tracking reference signal on the second resource based on a non-overlapping relationship between the first resource and the second resource. In some examples, the reference signal component 1325 may receive a demodulation reference signal based on the updated aspect. In some examples, a demodulation reference signal in a first symbol is received on a virtual port using a first comb configuration, wherein receiving the demodulation reference signal in the first symbol includes avoiding receiving the demodulation reference signal using a second comb configuration. In some examples, a demodulation reference signal in a second symbol is received on a virtual port using a second comb configuration, wherein receiving the demodulation reference signal in the second symbol includes avoiding receiving the demodulation reference signal using a second comb configuration.

[0172] The port configuration component 1330 may receive an indication of a port configuration for receiving a demodulation reference signal. In some examples, the port configuration component 1330 may update aspects of the port configuration. In some examples, aspects are updated based on SCS, channel delay spread, or both. In some examples, the port configuration component 1330 may receive a configuration of a port configured to receive a demodulation reference signal on each tone in a tone set, wherein the port is used to receive a demodulation reference signal. In some examples, at least one symbol of a demodulation reference signal pattern may include a first symbol and a second symbol. In some examples, the port configuration component 1330 may identify a first port associated with a first comb configuration and a second port associated with a second comb configuration. In some examples, the port configuration component 1330 may combine the first port and the second port to form a virtual port associated with the first comb configuration and the second comb configuration.

[0173] In some examples, an indication of a port configuration for receiving a demodulation reference signal is sent, wherein the sidelink control information includes a parameter for indicating an aspect of the port configuration for receiving the demodulation reference information for the UE to update. In some examples, the parameter indicates that the aspect is updated by combining a first port and a second port of the port configuration at the UE to form a virtual port. The parameter indicates to the UE that the aspect is updated by: when receiving a demodulation reference signal on the first port, avoiding code division multiplexing on the first port of the port configuration with the second port of the port configuration. In some examples, the parameter indicates to the UE that the aspect is updated by: using a single comb configuration of a first comb configuration associated with the first port of the port configuration or a second comb configuration associated with the second port of the port configuration to receive the demodulation reference signal. In some cases, the parameter includes an index of a table corresponding to the updated aspect.

[0174] In some examples, the port configuration component 1330 may send an indication to the UE of a port configured to receive a demodulation reference signal on each tone in the tone set. In some cases, the port configuration includes a first port and a second port configured to receive the demodulation reference signal, wherein the updating aspect includes combining the first port and the second port to form a virtual port, and wherein the demodulation reference signal is received on the virtual port. In some cases, the port configuration includes a first port and a second port, wherein the updating aspect includes determining that when receiving the demodulation reference signal on the first port, code division multiplexing is avoided on the first port with the second port, and wherein the demodulation reference signal is received on the first port. In some cases, the port configuration includes a first port corresponding to a first comb configuration and a second port corresponding to a second comb configuration, wherein the first port is configured to receive the demodulation reference signal using the first comb configuration and the second port is configured to receive the demodulation reference signal using the second comb configuration, and wherein the updating aspect includes determining to receive the demodulation reference signal using a single one of the first comb configuration or the second comb configuration.

[0175] The MCS receiver 1335 may receive an indication of a modulation coding scheme, wherein aspects are updated based on the modulation coding scheme. In some examples, aspects may be updated based on the modulation coding scheme having a value above a threshold. In some examples, aspects may also be updated based on SCS, channel delay spread, or both.

[0176] The control signaling component 1340 can receive control signaling indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal. In some examples, receiving the control signaling involves receiving an indication of a demodulation reference signal pattern for the demodulation reference signal, wherein the demodulation reference signal pattern indicates the first resource for receiving the demodulation reference signal. By receiving the configuration for the non-overlapping relationship, the control signaling component 1340 can experience less overhead in determining the second resource.

[0177] In some examples, the control signaling component 1340 may send control signaling for indicating a configuration for a non-overlapping relationship between the first resource and the second resource. In some examples, receiving the control signaling includes receiving a first control signaling for indicating the first resource and a second control signaling for indicating the second resource. In some examples, sending the control signaling involves sending a first control signaling for indicating the first resource and a second control signaling for indicating the second resource. In some examples, the control signaling component 1340 may send control signaling for indicating a demodulation reference signal mode. In some cases, the second control signaling includes sidelink control information signaling for indicating the second resource. In some cases, the second control signaling includes medium access control (MAC) control element signaling or radio resource control signaling for indicating the second resource.

[0178] The PTRS pattern component 1345 can determine a phase tracking reference signal pattern based on the demodulation reference signal pattern, wherein the phase tracking reference signal pattern indicates a second resource for receiving a phase tracking reference signal.

[0179] Frequency density configuring component 1350 can receive a configuration of a frequency density for a phase tracking reference signal pattern via radio resource control signaling. In some examples, frequency density configuring component 1350 can send a configuration of a frequency density for a phase tracking reference signal pattern via radio resource control signaling.

[0180] The relationship determining component 1355 can determine a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal. In some examples, determining the non-overlapping relationship involves determining a demodulation reference signal pattern of a demodulation reference signal associated with a phase tracking reference signal pattern, the phase tracking reference signal pattern indicating the second resource for the phase tracking reference signal, wherein the demodulation reference signal pattern indicates the first resource for the demodulation reference signal.

[0181] Fig.14 A schematic diagram of a system 1400 including a device 1405 according to aspects of the present disclosure is shown. The device 1405 may be an example of or include a component of a device 1105, a device 1205, or a UE 115 as described herein. The device 1405 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1410, a transceiver 1415, an antenna 1420, a memory 1425, and a processor 1435. These components may be in electronic communication via one or more buses (e.g., a bus 1440).

[0182] The communications manager 1410 may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern, identify that: for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal, and receive the sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone. The communications manager 1410 may also send sidelink control information to the UE that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal, and send the sidelink data transmission based on at least one symbol of the demodulation reference signal carrying a demodulation reference signal for each tone. By identifying at least one symbol for a demodulation reference signal pattern, each tone in a set of tones being configured to carry a demodulation reference signal, system 1400 may be able to use an increased SCS while mitigating the performance penalty associated with performing interpolation at the increased SCS.

[0183] The communication manager 1410 may also receive control signaling indicating a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal, wherein the first resource is non-overlapping with the second resource in time; and based on the first resource being non-overlapping with the second resource in time, receiving the demodulation reference signal on the first resource and receiving the phase tracking reference signal on the second resource. The communication manager 1410 may also determine a first resource for a demodulation reference signal, the first resource being non-overlapping with the second resource for a phase tracking reference signal; send control signaling indicating the first resource and the second resource; and based on the first resource being non-overlapping with the second resource, sending the demodulation reference signal on the first resource and sending the phase tracking reference signal on the second resource. By receiving a configuration for a non-overlapping relationship, the system 1400 may experience less overhead when determining the second resource.

[0184] The transceiver 1415 may communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1415 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1415 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0185] In some cases, a wireless device may include a single antenna 1420. However, in some cases, a device may have more than one antenna 1420, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0186] The memory 1425 may include random access memory (RAM) and read-only memory (ROM). The memory 1425 may store computer-readable, computer-executable code 1430, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, among other things, the memory 1425 may contain a basic input / output system (BIOS), which may control basic hardware or software operations (such as interaction with peripheral components or devices).

[0187] The code 1430 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1430 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1430 may not be directly executable by the processor 1435, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0188] Processor 1435 may 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, processor 1435 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1435. Processor 1435 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1425) so that device 1405 performs various functions (e.g., functions or tasks for supporting a sidelink shared channel demodulation reference signal configuration scheme).

[0189] By including or configuring the communication manager 1410 according to the examples as described herein, the device 1405 can support techniques for the communication manager 1410 to use full-frequency DMRS ports, which can enable the device 1405 to use increased SCS while mitigating the performance loss associated with performing interpolation. In addition, the device 1405 can support techniques for the communication manager 1410 to transmit dynamic or semi-dynamic indications of PTRS, which can be associated with less overhead than other methods by which the device 1105 can determine the PTRS resources on which to transmit PTRS.

[0190] Fig.15 1 is a flowchart illustrating a method 1500 according to various aspects of the present disclosure. The operations of the method 1500 may be implemented by the UE 115 or its components as described herein. For example, the operations of the method 1500 may be implemented by the UE 115 or its components as described herein. Figures 11 to 14The communication manager described in the present invention may be used to perform. In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0191] At 1505, the UE may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 11 to 14 Describes the SCI components to perform.

[0192] At 1510, the UE may identify that, for at least one symbol of a demodulation reference signal pattern, each tone in a set of tones is configured to carry a demodulation reference signal. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 11 to 14 The full frequency components described are performed.

[0193] At 1515, the UE may receive a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 11 to 14 The sidelink data transmission component described is performed.

[0194] Fig.16 1600 according to various aspects of the present disclosure. The operations of the method 1600 may be implemented by the UE 115 or its components as described herein. For example, the operations of the method 1600 may be implemented by the UE 115 or its components as described herein. Figures 11 to 14 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0195] At 1605, the UE may receive an indication of a port configuration for receiving a demodulation reference signal. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 11 to 14 Describes the port configuration component to perform.

[0196] At 1610, the UE may receive sidelink control information that schedules resources for sidelink data transmission across a set of tones and indicates a demodulation reference signal pattern. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 11 to 14 Describes the SCI components to perform.

[0197] At 1615, the UE may identify that, for at least one symbol of the demodulation reference signal pattern, each tone in the tone set is configured to carry a demodulation reference signal. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 11 to 14 The full frequency components described are performed.

[0198] At 1620, the UE may update aspects of the port configuration. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed as described with reference to Figures 11 to 14 Describes the port configuration component to perform.

[0199] At 1625, the UE may receive a sidelink data transmission based on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed as described with reference to Figures 11 to 14 The sidelink data transmission component described is performed.

[0200] At 1630, the UE may receive a demodulation reference signal based on the updated aspects. The operations of 1630 may be performed according to the methods described herein. In some examples, aspects of the operations of 1630 may be performed as described with reference to Figures 11 to 14 The reference signal components described are implemented.

[0201] Fig.17 1700 according to various aspects of the present disclosure. The operations of the method 1700 may be implemented by the UE 115 or its components as described herein. For example, the operations of the method 1700 may be implemented by the UE 115 or its components as described herein. Figures 11 to 14 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0202] At 1705, the UE may send sidelink control information to the UE, the sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described with reference to Figures 11 to 14 Describes the SCI components to perform.

[0203] At 1710, the UE may transmit a sidelink data transmission based on at least one symbol of the demodulation reference signal carrying a demodulation reference signal for each tone. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 11 to 14 The sidelink data transmission component described is performed.

[0204] Fig.18 1800 according to various aspects of the present disclosure. The operations of the method 1800 may be implemented by the UE 115 or its components as described herein. For example, the operations of the method 1800 may be implemented by the UE 115 or its components as described herein. Figures 11 to 14 The communication manager described in the present invention may be used to perform. In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0205] At 1805, the UE may receive control signaling for indicating a configuration of a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 11 to 14 The control signaling components described are used to perform.

[0206] At 1810, the UE may receive a demodulation reference signal on a first resource and a phase tracking reference signal on a second resource based on a non-overlapping relationship. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 11 to 14 The reference signal components described are implemented.

[0207] Fig.19 1900 according to various aspects of the present disclosure. The operations of the method 1900 may be implemented by the UE 115 or its components as described herein. For example, the operations of the method 1900 may be implemented by the UE 115 or its components as described herein. Figures 11 to 14 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0208] At 1905, the UE may determine a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed as described with reference to Figures 11 to 14 The relationships described determine the components to perform.

[0209] At 1910, the UE may send control signaling indicating a configuration for a non-overlapping relationship. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be as described with reference to Figures 11 to 14 The control signaling components described are used to perform.

[0210] At 1915, the UE may send a demodulation reference signal on the first resource and a phase tracking reference signal on the second resource based on the non-overlapping relationship. The operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed as described with reference to Figures 11 to 14 The reference signal components described are implemented.

[0211] The following provides a summary of various aspects of the present disclosure:

[0212] Aspect 1: A method for wireless communication, comprising: receiving sidelink control information, the sidelink control information scheduling resources for sidelink data transmission across a tone set and indicating a demodulation reference signal pattern; identifying: for at least one symbol of the demodulation reference signal pattern, each tone in the tone set is configured to carry a demodulation reference signal; and receiving sidelink data transmission based at least in part on at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone.

[0213] Aspect 2: The method of aspect 1 further includes: receiving an indication of a port configuration for receiving a demodulation reference signal; updating aspects of the port configuration; and receiving a demodulation reference signal based at least in part on the updated aspects.

[0214] Aspect 3: The method of aspect 2, wherein the aspect is updated based at least in part on subcarrier spacing, channel delay spread, or both.

[0215] Aspect 4: The method of any one of Aspects 2 to 3, further comprising: receiving an indication of a modulation and coding scheme, wherein the aspect is updated based at least in part on the modulation and coding scheme.

[0216] Aspect 5: The method of aspect 4, wherein the aspect is updated based at least in part on the modulation coding scheme having a value above a threshold.

[0217] Aspect 6: The method of any one of Aspects 4 to 5, wherein the aspect is also updated based at least in part on subcarrier spacing, channel delay spread, or both.

[0218] Aspect 7: The method of any one of Aspects 2 to 6, wherein the sidelink control information includes a parameter for indicating an aspect to be updated.

[0219] Aspect 8: The method of aspect 7, wherein the parameter comprises an index of a table corresponding to the updated aspect, and updating the aspect comprises: selecting the updated aspect from the table according to the index.

[0220] Aspect 9: The method of any one of Aspects 2 to 8, wherein the port configuration includes a first port and a second port configured to receive a demodulation reference signal, and the updating aspect includes: combining the first port and the second port to form a virtual port, and the demodulation reference signal is received on the virtual port.

[0221] Aspect 10: A method according to any one of Aspects 2 to 9, wherein the port configuration includes a first port and a second port, and the updating aspect includes: determining that when a demodulation reference signal is received on the first port, code division multiplexing is avoided on the first port with the second port, and the demodulation reference signal is received on the first port.

[0222] Aspect 11: A method according to any one of Aspects 2 to 10, wherein the port configuration includes a first port corresponding to a first comb configuration and a second port corresponding to a second comb configuration, the first port is configured to use the first comb configuration and the second port is configured to use the second comb configuration to receive a demodulation reference signal, and the update aspect includes determining to use a single comb configuration of the first comb configuration or the second comb configuration to receive the demodulation reference signal.

[0223] Aspect 12: The method of any one of Aspects 1 to 11, further comprising: receiving an indication of a port configured to receive a demodulation reference signal on each tone in the tone set, wherein the port is used to receive the demodulation reference signal.

[0224] Aspect 13: A method according to any one of Aspects 1 to 12, wherein at least one symbol of a demodulation reference signal pattern comprises a first symbol and a second symbol, and the method further comprises: identifying a first port associated with a first comb configuration and a second port associated with a second comb configuration; combining the first port and the second port to form a virtual port associated with the first comb configuration and the second comb configuration; receiving a demodulation reference signal in the first symbol on the virtual port using the first comb configuration, wherein receiving the demodulation reference signal in the first symbol comprises: avoiding using the second comb configuration to receive the demodulation reference signal; and receiving a demodulation reference signal in the second symbol on the virtual port using the second comb configuration, wherein receiving the demodulation reference signal in the second symbol comprises: avoiding using the second comb configuration to receive the demodulation reference signal.

[0225] Aspect 14: A method for wireless communication, comprising: sending sidelink control information to a UE, the sidelink control information scheduling resources for sidelink data transmission across a tone set and indicating a demodulation reference signal mode, wherein, for at least one symbol of the demodulation reference signal mode, each tone in the tone set is configured to carry a demodulation reference signal; and sending sidelink data transmission based at least in part on carrying a demodulation reference signal for each tone based at least in part on at least one symbol of the demodulation reference signal.

[0226] Aspect 15: The method of Aspect 14 further includes: sending an indication of a port configuration for receiving a demodulation reference signal, wherein the sidelink control information includes parameters for indicating aspects of the port configuration for receiving a demodulation reference signal for updating by the UE.

[0227] Aspect 16: The method of aspect 15, wherein the parameter indicates that the aspect is updated by combining a first port and a second port of a port configuration at the UE to form a virtual port.

[0228] Aspect 17: The method of any one of Aspects 15 to 16, wherein the parameter indicates to the UE that the aspect is updated by the following operation: when receiving a demodulation reference signal on a first port, avoiding code division multiplexing on a first port of a port configuration with a second port of the port configuration.

[0229] Aspect 18: The method of any one of Aspects 15 to 17, wherein the parameter indicates to the UE that the aspect is updated by: receiving a demodulation reference signal using a single comb configuration of a first comb configuration associated with a first port of the port configuration or a second comb configuration associated with a second port of the port configuration.

[0230] Aspect 19: The method of any one of Aspects 15 to 18, wherein the parameter comprises an index of a table corresponding to the updated aspect.

[0231] Aspect 20: The method of any one of Aspects 14 to 19, further comprising: sending to the UE an indication of a port configured to receive a demodulation reference signal on each tone in the tone set.

[0232] Aspect 21: A method for wireless communication, comprising: receiving control signaling for indicating a configuration for a non-overlapping relationship between a first resource for receiving a demodulation reference signal and a second resource for receiving a phase tracking reference signal; and receiving the demodulation reference signal on the first resource and the phase tracking reference signal on the second resource based at least in part on the non-overlapping relationship.

[0233] Aspect 22: The method of Aspect 21, wherein receiving control signaling includes: receiving first control signaling indicating the first resource and second control signaling indicating the second resource.

[0234] Aspect 23: The method of Aspect 22, wherein the second control signaling includes sidelink control information signaling for indicating the second resource.

[0235] Aspect 24: The method according to any one of Aspects 22 to 23, wherein the second control signaling comprises medium access control (MAC) control element signaling or radio resource control signaling for indicating the second resource.

[0236] Aspect 25: A method according to any one of Aspects 21 to 24, wherein receiving control signaling comprises: receiving an indication of a demodulation reference signal mode of a demodulation reference signal, wherein the demodulation reference signal mode indicates a first resource for receiving the demodulation reference signal, and the method further comprises: determining a phase tracking reference signal mode based at least in part on the demodulation reference signal mode, wherein the phase tracking reference signal mode indicates a second resource for receiving the phase tracking reference signal.

[0237] Aspect 26: The method of Aspect 25 further includes: receiving a configuration of a frequency density for a phase tracking reference signal pattern via radio resource control signaling.

[0238] Aspect 27: A method for wireless communication, comprising: determining a non-overlapping relationship between a first resource for a demodulation reference signal and a second resource for a phase tracking reference signal; sending control signaling to indicate a configuration for the non-overlapping relationship; and sending a demodulation reference signal on the first resource and a phase tracking reference signal on the second resource based at least in part on the non-overlapping relationship.

[0239] Aspect 28: The method of Aspect 27, wherein sending control signaling includes: sending first control signaling for indicating the first resource and second control signaling indicating the second resource.

[0240] Aspect 29: The method of Aspect 28, wherein the second control signaling includes sidelink control information signaling for indicating the second resource.

[0241] Aspect 30: The method according to any one of Aspects 28 to 29, wherein the second control signaling comprises medium access control (MAC) control element signaling or radio resource control signaling for indicating the second resource.

[0242] Aspect 31: A method according to any one of Aspects 27 to 30, wherein determining the non-overlapping relationship comprises: determining a demodulation reference signal pattern of a demodulation reference signal associated with a phase tracking reference signal pattern, the phase tracking reference signal pattern indicating a second resource used for the phase tracking reference signal, wherein the demodulation reference signal pattern indicates a first resource used for the demodulation reference signal, and wherein sending control signaling comprises: sending control signaling for indicating the demodulation reference signaling pattern.

[0243] Aspect 32: The method of Aspect 31 further includes: sending a configuration of a frequency density for a phase tracking reference signal mode via radio resource control signaling.

[0244] Aspect 33: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions, which are stored in the memory and can be executed by the processor to cause the apparatus to perform a method according to any one of Aspects 1 to 13 and / or 45.

[0245] Aspect 34: An apparatus for wireless communication, comprising: at least one unit for performing the method according to any one of Aspects 1 to 13 and / or 45.

[0246] Aspect 35: A non-transitory computer-readable medium storing a code for wireless communication, the code comprising instructions executable by a processor to perform the method according to any one of Aspects 1 to 13 and / or 45.

[0247] Aspect 36: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 14 to 20.

[0248] Aspect 37: An apparatus for wireless communication, comprising: at least one unit for performing the method according to any one of Aspects 14 to 20.

[0249] Aspect 38: A non-transitory computer-readable medium storing a code for wireless communication, the code comprising instructions executable by a processor to perform the method according to any one of aspects 14 to 20.

[0250] Aspect 39: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 21 to 26.

[0251] Aspect 40: An apparatus for wireless communication, comprising: at least one unit for performing the method according to any one of Aspects 21 to 26.

[0252] Aspect 41: A non-transitory computer-readable medium storing a code for wireless communication, the code comprising instructions executable by a processor to perform the method according to any one of Aspects 21 to 26.

[0253] Aspect 42: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 27 to 32.

[0254] Aspect 43: An apparatus for wireless communication, comprising: at least one unit for performing the method according to any one of Aspects 27 to 32.

[0255] Aspect 44: A non-transitory computer-readable medium storing a code for wireless communication, the code comprising instructions executable by a processor to perform the method according to any one of Aspects 27 to 32.

[0256] Aspect 45: A method of any one of Aspects 1 to 13, wherein the port configuration includes a first port and a second port, and wherein the updating aspect includes one or more of the following: combining the first port and the second port to form a virtual port, wherein a demodulation reference signal is received on the virtual port; determining to avoid performing code division multiplexing with a third port on the first port when receiving the demodulation reference signal on the first port, wherein the demodulation signal is received on the first port; and determining to use a single one of the first comb configuration corresponding to the first port or the second comb configuration corresponding to the second port to receive the demodulation reference signal.

[0257] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

[0258] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0259] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0260] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0261] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or sent through a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. Features that implement the functions may also be physically located at various locations, including being distributed so that portions of the functions are implemented at different physical locations.

[0262] Computer-readable medium includes both non-transitory computer storage medium and communication medium, and communication medium includes any medium that promotes the transmission of computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general-purpose computer or special-purpose computer.By way of example and not limitation, non-transitory computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device, or can be used for carrying or storing desired program code unit and can be accessed by general-purpose or special-purpose computer or general-purpose or special-purpose processor in the form of instruction or data structure Any other non-transitory medium.In addition, any connection is appropriately called computer-readable medium.For example, if software is to send from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0263] As used herein (including in the claims), "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0264] In the drawings, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label with a dash and a second label, the second label being used to distinguish among similar components. If only the first reference label is used in the specification, the description applies to any of the similar components having the same first reference label, without regard to the second reference label or other subsequent reference labels.

[0265] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations, and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," and is not "preferred" or "advantageous over other examples." For the purpose of providing an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0266] The description herein is provided to enable one of ordinary skill in the art to perform or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is given the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: receiving an indication of a port configuration for receiving a demodulation reference signal; receiving sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern; identifying that: for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; Updating aspects of the port configuration, wherein the port configuration includes a first port and a second port, and wherein updating the aspects includes one or more of: (a) combining the first port and the second port to form a virtual port, wherein the demodulation reference signal is received on the virtual port; (b) determining to avoid code division multiplexing on the first port with a third port when the demodulation reference signal is received on the first port, wherein the demodulation reference signal is received on the first port; and (c) determining to use a single one of a first comb configuration corresponding to the first port or a second comb configuration corresponding to the second port to receive the demodulation reference signal; receiving the sidelink data transmission based at least in part on the at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone; and The demodulation reference signal is received based at least in part on the updated aspect.

2. The method according to claim 1, wherein: The aspects are updated based at least in part on subcarrier spacing, channel delay spread, or both.

3. The method according to claim 1, further comprising: An indication of a modulation and coding scheme is received, wherein the aspect is updated based at least in part on the modulation and coding scheme.

4. The method according to claim 3, wherein: The aspect is updated based at least in part on the modulation coding scheme having a value above a threshold.

5. The method according to claim 3, wherein: The aspects are also updated based at least in part on subcarrier spacing, channel delay spread, or both.

6. The method according to claim 1, wherein: The sidelink control information comprises parameters for indicating the aspect to be updated.

7. The method according to claim 6, wherein: The parameter comprises an index of a table corresponding to the updated aspect, wherein updating the aspect comprises selecting the updated aspect from the table according to the index.

8. The method according to claim 1, further comprising: An indication of a port configured to receive the demodulation reference signal on each tone in the set of tones is received, wherein the port is used to receive the demodulation reference signal.

9. The method according to claim 1, wherein: The at least one symbol of the demodulation reference signal pattern comprises a first symbol and a second symbol, and further comprises: identifying the first port associated with the first comb configuration and the second port associated with the second comb configuration; combining the first port and the second port to form a virtual port associated with the first comb configuration and the second comb configuration; receiving a demodulation reference signal in the first symbol on the virtual port using the first comb configuration, wherein receiving the demodulation reference signal in the first symbol comprises: refraining from receiving the demodulation reference signal using the second comb configuration; and A demodulation reference signal in the second symbol is received on the virtual port using the second comb configuration, wherein receiving the demodulation reference signal in the second symbol includes refraining from receiving the demodulation reference signal using the second comb configuration.

10. A method for wireless communication, comprising: sending an indication of a port configuration for receiving a demodulation reference signal; sending sidelink control information to a user equipment (UE), the sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal, wherein the sidelink control information includes a parameter indicating an aspect of the port configuration for receiving the demodulation reference signal to be updated by the UE, wherein the port configuration includes a first port and a second port, and wherein the parameter indicates that the aspect is updated by one or more of: (a) combining the first port and the second port to form a virtual port, wherein the demodulation reference signal is received on the virtual port; (b) determining to avoid code division multiplexing on the first port with a third port when the demodulation reference signal is received on the first port, wherein the demodulation reference signal is received on the first port; and (c) determining to use a single one of a first comb configuration corresponding to the first port or a second comb configuration corresponding to the second port to receive the demodulation reference signal; transmitting the sidelink data transmission based at least in part on the at least one symbol of the demodulation reference signal carrying a demodulation reference signal for each tone; and The demodulation reference signal is sent based at least in part on the updated aspect.

11. An apparatus for wireless communication, comprising: processor, a memory in electronic communication with the processor, and Instructions, which are stored in the memory and can be executed by the processor to cause the device to perform the following operations: receiving an indication of a port configuration for receiving a demodulation reference signal; receiving sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern; identifying that: for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal; Updating aspects of the port configuration, wherein the port configuration includes a first port and a second port, and wherein updating the aspects includes one or more of: (a) combining the first port and the second port to form a virtual port, wherein the demodulation reference signal is received on the virtual port; (b) determining to avoid code division multiplexing on the first port with a third port when the demodulation reference signal is received on the first port, wherein the demodulation reference signal is received on the first port; and (c) determining to use a single one of a first comb configuration corresponding to the first port or a second comb configuration corresponding to the second port to receive the demodulation reference signal; receiving the sidelink data transmission based at least in part on the at least one symbol of the demodulation reference signal pattern carrying a demodulation reference signal for each tone; and The demodulation reference signal is received based at least in part on the updated aspect.

12. The device according to claim 11, wherein The aspects are updated based at least in part on subcarrier spacing, channel delay spread, or both.

13. The device according to claim 11, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: An indication of a modulation and coding scheme is received, wherein the aspect is updated based at least in part on the modulation and coding scheme.

14. The device according to claim 13, wherein: The aspect is updated based at least in part on the modulation coding scheme having a value above a threshold.

15. The device according to claim 13, wherein: The aspects are also updated based at least in part on subcarrier spacing, channel delay spread, or both.

16. The device according to claim 11, wherein The sidelink control information comprises parameters for indicating the aspect to be updated.

17. The device according to claim 16, wherein: The parameter comprises an index of a table corresponding to the updated aspect, wherein updating the aspect comprises selecting the updated aspect from the table according to the index.

18. The device according to claim 11, wherein The instructions may also be executed by the processor to cause the device to perform the following operations: An indication of a port configured to receive the demodulation reference signal on each tone in the set of tones is received, wherein the port is used to receive the demodulation reference signal.

19. The device according to claim 11, wherein: The at least one symbol of the demodulation reference signal pattern includes a first symbol and a second symbol, and wherein the instructions are further executable by the processor to cause the apparatus to perform the following operations: identifying the first port associated with the first comb configuration and the second port associated with the second comb configuration; combining the first port and the second port to form a virtual port associated with the first comb configuration and the second comb configuration; receiving a demodulation reference signal in the first symbol on the virtual port using the first comb configuration, wherein receiving the demodulation reference signal in the first symbol is executable by the processor to cause the apparatus to avoid receiving the demodulation reference signal using the second comb configuration; and and receiving a demodulation reference signal in the second symbol through the virtual port using the second comb configuration, wherein receiving the demodulation reference signal in the second symbol is executable by the processor to cause the apparatus to avoid receiving the demodulation reference signal using the second comb configuration.

20. An apparatus for wireless communication, comprising: processor, a memory in electronic communication with the processor, and Instructions, which are stored in the memory and can be executed by the processor to cause the device to perform the following operations: sending an indication of a port configuration for receiving a demodulation reference signal; sending sidelink control information to a user equipment (UE), the sidelink control information scheduling resources for sidelink data transmission across a set of tones and indicating a demodulation reference signal pattern, wherein for at least one symbol of the demodulation reference signal pattern, each tone in the set of tones is configured to carry a demodulation reference signal, wherein the sidelink control information includes a parameter indicating an aspect of the port configuration for receiving the demodulation reference signal to be updated by the UE, wherein the port configuration includes a first port and a second port, and wherein the parameter indicates that the aspect is updated by one or more of: (a) combining the first port and the second port to form a virtual port, wherein the demodulation reference signal is received on the virtual port; (b) determining to avoid code division multiplexing on the first port with a third port when the demodulation reference signal is received on the first port, wherein the demodulation reference signal is received on the first port; and (c) determining to use a single one of a first comb configuration corresponding to the first port or a second comb configuration corresponding to the second port to receive the demodulation reference signal; and transmitting the sidelink data transmission based at least in part on the at least one symbol of the demodulation reference signal carrying a demodulation reference signal for each tone; and The demodulation reference signal is sent based at least in part on the updated aspect.

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