Signaling modes for time drift reference signals

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit one or more messages indicating an ability of the UE to support reception of a demodulation reference signal (DMRS) and a time drift reference signal (TDRS) according to one or more signaling modes configured by a network. The UE may then receive one or more control messages indicating a first signaling mode for one or more DMRSs and a second signaling mode for one or more TDRSs, where the first signaling mode corresponds to or is based on the second signaling mode. The UE may receive a downlink shared channel multiplexed with the one or more DMRSs according to the first signaling mode, and may receive the downlink shared channel multiplexed with the one or more TDRSs according to the second signaling mode.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims the benefit of U.S. patent application No. 17 / 859,865, filed by PAZ et al. on July 7, 2022, entitled “SIGNALING PATTERNS FOR TIME DRIFT REFERENCE SIGNALS,” which is assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following relates to wireless communications, including signaling patterns for a Time Drift Reference Signal (TDRS). Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, 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 (such as long term evolution (LTE) systems, advanced 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 use techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each of which supports wireless communication of communication devices, which may be referred to as user equipment (UE). Summary of the invention

[0005] The described techniques relate to improved methods, systems, devices, and apparatuses that support signaling patterns for time drift reference signals (TDRS). For example, the described techniques may support high frequency wireless communications, such as communications in the sub-terahertz (sub-THz) band. To save power and reduce signaling overhead, a device may support a sparse inter-slot pattern for signaling demodulation reference signals (DMRS) so that a device (e.g., user equipment (UE)) may use one or more DMRS less frequently to perform channel estimation. However, in some cases, the system may be affected by inaccuracies over time, such as phase shifts or phase errors over time due to reduced channel estimates.

[0006] To reduce cumulative errors, the network may support a pattern for a narrowband reference signal or a time drift reference signal (TDRS) that is complementary to the inter-slot DMRS pattern and used for channel estimation between DMRS symbols or time slots (e.g., additional or supplemental channel estimation). The UE may signal the network with a capability indicating support for TDRS, and may receive one or more control messages indicating a first signaling pattern for DMRS and a second signaling pattern for TDRS. The UE may then receive a downlink shared channel multiplexed with DMRS and TDRS within a symbol or time slot according to the first signaling pattern and the second signaling pattern.

[0007] A method for wireless communication at a UE is described. The method may include: sending one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes; receiving one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling mode for one or more DMRS via a set of transmission time intervals and indicating a second signaling mode for one or more TDRS via the set of transmission time intervals, the first signaling mode corresponding to the second signaling mode; and receiving a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling mode, and being multiplexed with the one or more TDRS according to the second signaling mode.

[0008] A device for wireless communication at a UE is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to enable the device to: send one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes; receive one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling mode for one or more DMRS via a set of transmission time intervals and indicating a second signaling mode for one or more TDRS via the set of transmission time intervals, the first signaling mode corresponding to the second signaling mode; and receive a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling mode, and being multiplexed with the one or more TDRS according to the second signaling mode.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include: a component for sending one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes; a component for receiving one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling mode for one or more DMRS via a set of transmission time intervals and indicating a second signaling mode for one or more TDRS via the set of transmission time intervals, the first signaling mode corresponding to the second signaling mode; and a component for receiving a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling mode, and being multiplexed with the one or more TDRS according to the second signaling mode.

[0010] A non-transitory computer-readable medium storing a code for wireless communication at a UE is described. The code may include instructions executable by a processor to perform the following operations: sending one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling patterns; receiving one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling pattern for one or more DMRS via a set of transmission time intervals and indicating a second signaling pattern for one or more TDRS via the set of transmission time intervals, the first signaling pattern corresponding to the second signaling pattern; and receiving a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling pattern, and being multiplexed with the one or more TDRS according to the second signaling pattern.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first signaling pattern corresponds to a first allocation periodicity of the one or more DMRSs, and the methods, apparatus, and non-transitory computer-readable media may also include operations, features, components, or instructions for: receiving the downlink shared channel multiplexed with the one or more TDRSs according to the second signaling pattern, the second signaling pattern corresponding to a second allocation periodicity that can be associated with the first allocation periodicity.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving the one or more DMRSs according to the first signaling pattern and the first allocation periodicity; and receiving the one or more TDRSs according to the second signaling pattern and the second allocation periodicity, wherein the second allocation periodicity may be greater than the first allocation periodicity.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing an STO calibration procedure based on an identified sampling timing offset (STO) using one or more measurements associated with the one or more DMRSs of the first signaling mode, the one or more TDRSs of the second signaling mode, or both.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, performing the STO calibration procedure may include operations, features, components, or instructions for performing the STO calibration procedure using measurements associated with a DMRS or TDRS that may be closest in time to the identified STO.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, performing the STO calibration procedure may include operations, features, components, or instructions for performing the STO calibration procedure using measurements associated with one or more consecutive DMRS, one or more consecutive TDRS, or a linear interpolation between the two.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving an indication that the second signaling mode may be adjusted based on the STO being greater than an STO threshold; and receiving the one or more TDRS according to the adjusted second signaling mode.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the one or more control messages may include operations, features, components, or instructions for: receiving a first indication of the first signaling mode for the one or more DMRS via a radio resource control message; and receiving, based on the RRC message, a second indication of the second signaling mode for the one or more TDRS via a downlink control information (DCI) message.

[0018] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, via a bitmap included in the DCI message, the DCI message that may be coupled with the first signaling pattern.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the one or more control messages may include operations, features, components, or instructions for: receiving a table via the one or more control messages, the table indicating at least: a first set of signaling patterns for the one or more DMRSs, the first set of signaling patterns including the first signaling pattern; a second set of signaling patterns for the one or more TDRSs, the second set of signaling patterns including the second signaling pattern; and an MCS set associated with the first set of signaling patterns and the second set of signaling patterns.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: selecting the first signaling mode from the first set of signaling modes; selecting the second signaling mode from the second set of signaling modes; and selecting an MCS from the MCS set, wherein the MCS may be associated with the first signaling mode and the second signaling mode based on the table.

[0021] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for applying one or more parameters associated with the first signaling pattern to obtain the second signaling pattern, the one or more parameters including a first DMRS position, one or more DMRS generation parameters, or both.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the one or more TDRSs may be assigned to a single antenna port that may be quasi-co-located with at least one antenna port associated with the one or more DMRSs.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a frequency domain allocation for the one or more TDRSs, the frequency domain allocation indicating a first set of resources allocated for the one or more TDRSs relative to a second set of resources allocated for data.

[0024] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication of one or more allocated bandwidth thresholds associated with the one or more TDRSs, wherein the bandwidth associated with the one or more TDRSs may be based on the MCS and the one or more allocated bandwidth thresholds.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a sequence associated with the one or more TDRSs includes a low peak to average power ratio (PAPR) sequence.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first signaling pattern includes an inter-slot DMRS pattern, and the second signaling pattern includes an inter-slot TDRS pattern.

[0027] A method is described. The method may include: receiving one or more messages indicating the ability of a UE to support receiving DMRS and TDRS according to one or more signaling modes; sending one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling mode for one or more DMRS via a set of transmission time intervals and indicating a second signaling mode for one or more TDRS via the set of transmission time intervals, the first signaling mode corresponding to the second signaling mode; and sending a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling mode, and being multiplexed with the one or more TDRS according to the second signaling mode.

[0028] A device is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the device to: receive one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes; send one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling mode for one or more DMRS via a set of transmission time intervals and indicating a second signaling mode for one or more TDRS via the set of transmission time intervals, the first signaling mode corresponding to the second signaling mode; and send a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling mode, and being multiplexed with the one or more TDRS according to the second signaling mode.

[0029] Another apparatus is described. The apparatus may include: a component for receiving one or more messages indicating the ability of a UE to support receiving DMRS and TDRS according to one or more signaling patterns; a component for sending one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling pattern for one or more DMRS via a set of transmission time intervals and indicating a second signaling pattern for one or more TDRS via the set of transmission time intervals, the first signaling pattern corresponding to the second signaling pattern; and a component for sending a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling pattern, and being multiplexed with the one or more TDRS according to the second signaling pattern.

[0030] A non-transitory computer-readable medium storing code is described. The code may include instructions executable by a processor to perform the following operations: receiving one or more messages indicating the ability of a UE to support receiving DMRS and TDRS according to one or more signaling patterns; sending one or more control messages based on the ability of the UE, the one or more control messages indicating a first signaling pattern for one or more DMRS via a set of transmission time intervals and indicating a second signaling pattern for one or more TDRS via the set of transmission time intervals, the first signaling pattern corresponding to the second signaling pattern; and sending a downlink shared channel, the one or more DMRS, and the TDRS via the set of transmission time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling pattern, and being multiplexed with the one or more TDRS according to the second signaling pattern.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first signaling pattern corresponds to a first allocation periodicity of the one or more DMRSs, and the methods, apparatus, and non-transitory computer-readable media may also include operations, features, components, or instructions for sending the downlink shared channel multiplexed with the one or more TDRSs according to the second signaling pattern, the second signaling pattern corresponding to a second allocation periodicity that can be associated with the first allocation periodicity.

[0032] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: sending the one or more DMRSs according to the first signaling pattern and the first allocation periodicity; and sending the one or more TDRSs according to the second signaling pattern and the second allocation periodicity, wherein the second allocation periodicity may be greater than the first allocation periodicity.

[0033] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: adjusting the second signaling pattern based on the identified STO being greater than an STO threshold; and sending the one or more TDRS according to the adjusted second signaling pattern.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the one or more control messages may include operations, features, components, or instructions for: receiving a first indication of the first signaling mode for the one or more DMRS via an RRC message; and sending, based on the RRC message, a second indication of the second signaling mode for the one or more TDRS via a DCI message.

[0035] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending the DCI message that may be coupled with the first signaling mode via a bitmap included in the DCI message.

[0036] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the one or more control messages may include operations, features, components, or instructions for: sending a table via the one or more control messages, the table indicating at least: a first set of signaling patterns for the one or more DMRSs, the first set of signaling patterns including the first signaling pattern; a second set of signaling patterns for the one or more TDRSs, the second set of signaling patterns including the second signaling pattern; and an MCS set associated with the first set of signaling patterns and the second set of signaling patterns.

[0037] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the one or more TDRSs may be assigned to a single antenna port that may be quasi-co-located with at least one antenna port associated with the one or more DMRSs.

[0038] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a frequency domain allocation for the one or more TDRSs, the frequency domain allocation indicating a first set of resources allocated for the one or more TDRSs relative to a second set of resources allocated for data.

[0039] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication of one or more allocated bandwidth thresholds associated with the one or more TDRSs, wherein the bandwidth associated with the one or more TDRSs may be based on the MCS and the one or more allocated bandwidth thresholds.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sequence associated with the one or more TDRS comprises a low PAPR sequence.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first signaling pattern includes an inter-slot DMRS pattern, and the second signaling pattern includes an inter-slot TDRS pattern. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figures 1 to 3 An example of a wireless communication system supporting a signaling mode for a Time Drift Reference Signal (TDRS) according to one or more aspects of the present disclosure is illustrated.

[0043] Figure 4 An example of a process flow supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is illustrated.

[0044] Figure 5 and Figure 6 A block diagram of a device supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown.

[0045] Figure 7 A block diagram of a communications manager supporting a signaling mode for TDRS is shown in accordance with one or more aspects of the present disclosure.

[0046] Figure 8 A diagram of a system including a device supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown.

[0047] Fig. 9 and Fig.10 A block diagram of a device supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown.

[0048] Fig.11 A block diagram of a communications manager supporting a signaling mode for TDRS is shown in accordance with one or more aspects of the present disclosure.

[0049] Fig.12 A diagram of a system including a device supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown.

[0050] Figures 13 to 18 A flow chart illustrating a method of supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0051] Some high-frequency wireless systems (e.g., wireless systems supporting sub-terahertz (sub-THz) frequencies) may operate using short slot durations and increased subcarrier spacing relative to lower frequency bands (e.g., frequency range 1 (FR1) and frequency range 2 (FR2)). In order to save power and reduce signaling overhead, devices in high-frequency wireless systems may implement a sparse inter-slot pattern for signaling demodulation reference signals (DMRS), which allows the network to send DMRS less frequently according to the sparse inter-slot DMRS pattern so that the user equipment (UE) can perform channel estimation less frequently instead of performing channel estimation in every slot. The sparse inter-slot DMRS pattern reduces the physical downlink shared channel (PDSCH) pilot overhead and can correspondingly increase the data rate for the sub-THz band. However, in some cases, because the UE performs channel estimation less frequently, the system may accumulate sampling timing offset (STO) or phase error over time due to the lack of channel estimation per slot. In addition, the sub-THz band may be particularly sensitive to uncompensated STO and phase errors due to the short sampling time and short slot duration of the single-carrier orthogonal frequency division multiplexing (SC-OFDM) waveform used for sub-THz systems.

[0052] The wireless system may implement a variety of different techniques to support efficient and relatively low power mitigation of the accumulated residual phase drift or phase error when using a sparse inter-slot DMRS pattern. For example, the network may employ a narrowband reference signal or a time drift reference signal (TDRS) pattern that is complementary to the inter-slot DMRS pattern and is used for additional or supplemental channel estimation between DMRS symbols. Using TDRS may also consume less power and may have lower complexity than allocating a full DMRS symbol for channel estimation. Using an additional TDRS pattern may also allow for a higher sparsity level (or lower inter-slot density) for the inter-slot DMRS pattern to further reduce DMRS overhead and UE complexity and power consumption associated with channel estimation and equalization.

[0053] The network may configure (via radio resource control (RRC) configuration, downlink control information (DCI), or other signaling) a sparse DMRS pattern for use by the UE, and may also configure a sparse TDRS coupled with the DMRS pattern, where each TDRS opportunity occurs between two DMRS opportunities. The network may also configure multiple different DMRS-TDRS signaling patterns (coupled with corresponding modulation and coding schemes (MCS)), from which the UE may select based on factors such as changing channel conditions.

[0054] First, aspects of the present disclosure are described in the context of a wireless communication system.Aspects of the present disclosure are further illustrated and described by and with reference to process flows, apparatus diagrams, system diagrams, and flow diagrams related to a signaling pattern for TDRS.

[0055] Figure 1 An example of a wireless communication system 100 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 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 advanced LTE (LTE-A) network, an LTE-A Pro network, a new radio (NR) network, or a network operating according to other systems and radio technologies (including future systems and radio technologies not explicitly mentioned herein).

[0056] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may include devices in different forms or with different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, etc. In some examples, the network entities 105 and the UE 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, the network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) within which the UE 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area within which the network entity 105 and the UE 115 may support signal communications according to one or more radio access technologies (RATs).

[0057] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or both stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices, such as Figure 1 Other UEs 115 or network entities 105 are shown.

[0058] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from a second node.

[0059] In some examples, the network entities 105 may communicate with the core network 130 or with each other or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other directly (e.g., directly between each network entity 105) or indirectly (e.g., via the core network 130) via the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, the network entities 105 may communicate with each other via midhaul communication links 162 (e.g., according to a midhaul interface protocol) or fronthaul communication links 168 (e.g., according to a fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), etc. or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0060] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a transceiver base station, a radio base station, an NR base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a 5G NB, a next generation eNB (ng-eNB), a Home Node B, a Home Evolved Node B, or other suitable terms). In some examples, the network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, stand-alone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0061] In some examples, the network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit receive point (TRP). One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0062] The functional split between CU 160, DU 165, and RU 170 is flexible and may support different functions depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, and RU 170. For example, a functional split of a protocol stack may be employed between CU 160 and DU 165 such that CU 160 may support one or more layers of a protocol stack and DU 165 may support one or more different layers of a protocol stack. In some examples, CU 160 may host higher protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., RRC, service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functions and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between CU 160 and DU 165 or between DU 165 and RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by different ones of CU 160, DU 165, or RU 170). CU 160 may be further functionally split into CU control plane (CU-CP) and CU user plane (CU-UP) functions. CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented according to an interface (eg, channel) between layers of a protocol stack supported by the respective network entities 105 communicating via those communication links.

[0063] In some wireless communication systems (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DUs 165 or one or more RUs 170 may be controlled in part by one or more CUs 160 associated with a donor network entity 105 (e.g., a donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a coupled IAB donor's DU 165. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0064] Where the techniques described herein are applied in the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support the signaling mode for TDRS as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., an IAB node 104, a DU 165, a CU 160, a RU 170, a RIC 175, a SMO 180).

[0065] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. 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 may 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, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0066] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 shown.

[0067] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" may refer to a set of RF spectrum resources having a physical layer structure defined for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF 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 may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between these devices and any part (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send", "receive", or "communicate" when referring to the network entity 105 may refer to any part of the network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0068] The signal waveform transmitted via the carrier may be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM techniques, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and the subcarrier spacing may be 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), so that a relatively high number of resource elements (e.g., in the transmission duration) and a relatively high order modulation scheme may correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial resources may increase the data rate or data integrity used for communication with UE 115.

[0069] One or more parameter sets for a carrier may be supported, and the parameter sets may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different parameter sets. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications of a UE 115 may be constrained to one or more active BWPs.

[0070] The time interval for the network entity 105 or the UE 115 may be expressed as a multiple of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the supported subcarrier spacing, and N f The supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources 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).

[0071] 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 certain 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 certain number of symbol periods (e.g., depending on the length of the cyclic prefix appended in front of each symbol period). In some wireless communication systems 100, the time slot may be further divided into a plurality of micro time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0072] A subframe, a time slot, a mini-time slot, or a 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 transmit 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 a burst of a shortened TTI (sTTI)).

[0073] According to various techniques, physical channels may be multiplexed using carriers for communication. Physical control channels and physical data channels may be multiplexed for signaling via downlink carriers, 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)) of a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth of a carrier or a subset of that system bandwidth. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more UEs in UE 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 in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the amount 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 .

[0074] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0075] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable or low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, and may be supported by one or more services (such as push-to-talk, video, or data). Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0076] In some examples, the UE 115 may be configured to support direct communication with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., a base station 140, a RU 170), and the one or more UEs may support aspects of such D2D communication configured (e.g., or scheduled) by the network entity 105. In some examples, one or more UEs 115 in the group may be outside the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, network entity 105 may facilitate scheduling of resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving network entity 105.

[0077] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, 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 or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management of UE 115 served by a network entity 105 (e.g., a base station 140) associated with the core network 130. User IP packets may be delivered through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the IP service 150 of one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0078] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally speaking, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength ranges from about one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide services to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than communications using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0079] The wireless communication system 100 may also operate using a super high frequency (SHF) region that may be within the range of 3 GHz to 30 GHz (also referred to as a centimeter band) or an extremely high frequency (EHF) region that uses a spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between UE 115 and network entity 105 (e.g., base station 140, RU 170), and the EHF antenna of the corresponding device may be smaller and closer than the UHF antenna. In some examples, such technology may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to even greater attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency regions, and the use of frequency bands specified across these frequency regions may vary by country or regulatory agency.

[0080] The wireless communication system 100 may utilize licensed and unlicensed RF spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology using unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating using unlicensed RF spectrum bands, devices such as the network entity 105 and the UE 115 may employ carrier sensing for conflict detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with a component carrier (e.g., LAA) operating using a licensed band. Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0081] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the network entity 105 or UE 115 may be located in 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, antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may include an antenna array having a set of multiple rows and columns of antenna ports that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0082] 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 network entity 105, a UE 115) to shape 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 conveyed via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals conveyed 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 these antenna elements may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other direction).

[0083] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly to communicate via logical channels. The MAC layer may perform priority processing and multiplexing of logical channels into transport channels. The MAC layer may also implement error detection techniques, error correction techniques, or both to support retransmission to improve link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of an RRC connection that supports a radio bearer for user plane data between a UE 115 and a network entity 105 or a core network 130. The PHY layer may map a transport channel to a physical channel.

[0084] The wireless communication system 100 may support high frequency communications (such as sub-THz communications) and may operate using short slot durations and increased subcarrier spacing relative to lower frequency bands (e.g., FR1 and FR2). In order to save power and reduce signaling overhead, devices such as UE 115 and network entity 105 may implement a sparse inter-slot pattern for signaling DMRS so that UE 115 may perform channel estimation less frequently to save power and signaling overhead while increasing data rates. However, in some cases, because UE 115 performs channel estimation less frequently, the system may accumulate STO or phase errors over time due to the lack of per-slot channel estimation.

[0085] In some examples, the wireless communication system 200 may employ an additional narrowband reference signal or TDRS pattern that is complementary to the inter-slot DMRS pattern and used for additional or supplemental channel estimation between DMRS symbols. Using TDRS may also consume less power and may have lower complexity than allocating a full DMRS symbol for channel estimation. Using an additional TDRS pattern may also allow for a higher sparsity level (or lower inter-slot density) for the inter-slot DMRS pattern to further reduce DMRS overhead and UE complexity.

[0086] Figure 2 An example of a wireless communication system 200 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is illustrated. For example, the wireless communication system 200 may support communication between a UE 115-a and a network entity 105-a, which may be a reference Figure 1 Examples of corresponding devices described.

[0087] Some wireless communication systems such as wireless communication system 200 (e.g., high frequency systems operating using sub-THz frequencies) may have relatively static (e.g., flat) channel conditions due to factors such as low delay spread, relatively strong line-of-sight components, and low mobility of UEs operating in the sub-THz band. However, such high frequency systems may also have increased phase noise relative to lower frequency bands due to increased carrier frequency and increased subcarrier spacing (e.g., relative to FR2). In some cases, this can result in short sampling times and short OFDM symbol and slot durations, and the short slot durations combined with the effective static channel assumption can result in channel coherence times covering multiple slots of the sub-THz band.

[0088] To mitigate the relatively high levels of phase noise associated with the sub-THz band, the wireless device may implement a single carrier OFDM (SC-OFDM) waveform with a time domain phase tracking reference signal (TD-PTRS) as a waveform candidate. Additionally, TD-PTRS may allow UE 115-a to estimate and mitigate any residual or accumulated frequency offset to reduce phase drift or phase error accumulation as a function of time in the sub-THz band. This reduction in accumulated frequency offset may further reduce or eliminate effective channel variations over time (e.g., via common phase error (CPE) correction per OFDM symbol).

[0089] In order to support low channel estimation errors related to channel time interpolation and time coherence characteristics (e.g., relative to a channel estimation threshold or floor), some wireless communication systems may implement sparse inter-slot DMRS patterns for channel estimation. In this case, a configured inter-slot DMRS pattern may be used to allocate DMRS symbols once every few slots (e.g., instead of once per slot). In some examples, the wireless communication system 200 may support dynamic selection of inter-slot DMRS patterns to support higher channel estimation robustness (e.g., accuracy) at different levels of accumulated residual time drift between the nearest DMRS symbols at different levels of signal-to-noise ratio (SNR). In some cases, control signaling such as DCI scheduling multiple consecutive data slots may be used to allocate inter-slot DMRS patterns.

[0090] In some implementations, a sparse inter-slot DMRS pattern can reduce signaling overhead (e.g., PDSCH pilot overhead) and can increase data rates for sub-THz bands. In some examples, high-frequency communications associated with sub-THz bands can support large amounts of data that can be scheduled using bursty data transmissions, such that the network entity 105-a pre-allocates multiple slots (back-to-back transmissions) for the UE 115-a via a single DCI schedule (e.g., giant packets). In this case, the network can allocate a sparse inter-slot DMRS pattern using an RRC configuration or dynamic allocation signaled by a DCI or MAC-CE to accommodate the bursty slot allocation. Dynamic selection of the inter-slot DMRS pattern can support dynamic adjustment of channel estimates based on different levels of accumulated residual time drift between the most recent DMRS symbols at different levels of SNR. In some examples, the inter-slot DMRS pattern can be configured by a scheduling DCI and can be signaled via a bitmap indication or DCI field corresponding to the DMRS symbol allocation (e.g., in the first and last slots of a giant allocation).

[0091] In some cases, component carrier spacing, high bandwidth, and wideband resource allocations associated with sub-THz bands can increase sensitivity to uncompensated STO for communications. For example, uncompensated STO (or STO due to time drift) can introduce non-negligible phase bias in frequency domain channel estimates (e.g., channel estimates obtained from the most recent DMRS symbol or slot). In the case of using OFDM waveforms and sparse inter-slot DMRS patterns, the uncompensated STO error (STO) generated during multi-slot allocation time can be increased. err ) may result in channel mismatch as a function of the data RE index (k) and OFDM symbol index (n) given by:

[0092]

[0093] In this case, channel mismatch may result in a phase rotation of the data resource elements (eg, as a function of the constellation rotation of the resource element index).

[0094] In some cases, residual STO mitigation can be performed using a frequency domain phase tracking reference signal (FD-PTRS), and the network can allocate some density across the bandwidth to estimate and correct the accumulated STO (e.g., via phase slope estimation in the frequency domain). In some other cases (e.g., using SC-OFDM waveforms), non-compensated STO err This will result in inter-symbol interference (ISI) of the time-domain data symbols. To compensate for the STO error, the network can implement TD-PTRS allocation to estimate the TD equalizer response of the STO and mitigate ISI based on the TD-PTRS.

[0095] However, in some cases, such estimation and application of a TD equalizer for TD data symbols on each OFDM symbol may result in significant processing and corresponding power consumption penalties. For high frequency systems such as sub-THz systems, such increased processing and power consumption may be further amplified. Accordingly, sub-THz systems using SC-OFDM waveforms will also experience modulation and coding scheme (MCS) limitations and block error rate (BLER) floors due to uncompensated STO and time drift for medium / high SNR regimes (e.g., SNR above one or more thresholds), and based on the short time domain symbols and short cyclic prefix duration associated with the sub-THz band.

[0096] Therefore, some wireless communication systems may support different sparsity levels (e.g., density across time slots) of the inter-slot DMRS pattern for the SC-OFDM waveform (e.g., at least for situations where medium to high levels of SNR are expected). In order to ensure sufficient time tracking accuracy for the sparse inter-slot DMRS pattern and reduce uncompensated STO, the time and frequency tracking loops may be updated at a higher rate relative to the lower frequency bands. In this case, the steady-state variance and residual error (e.g., ppm_err) of the loop may be low (e.g., below 0.1 ppm).

[0097] In some examples, frequency offset estimation accuracy (and the corresponding residual ppm_err) may present challenges in the sub-THz band compared to lower frequency bands due to the higher impact of phase noise on the estimation variance and the lower observation time. Due to the relatively high parameter set in the sub-THz band, such an observation time may define the Cramer-Rao lower bound (CRLB) for a single frequency offset estimation session (e.g., open-loop estimation). Additionally or alternatively, the lower frequency band may achieve a higher loop averaging factor and processing gain for the time and frequency tracking loop to achieve at least a threshold level of time tracking accuracy, wherein the sub-THz band may have a higher synchronization pilot reference signal overhead. In some cases, the tracking loop accuracy (and the corresponding residual time drift) may depend on the effective synchronization pilot reference signal periodicity (synchronization signal block (SSB) + tracking reference signal (TRS) + effective rate of PDSCH allocation). The achievable accuracy may also depend on the UE SNR that determines the open-loop estimation variance residual level (e.g., so as not to limit the corresponding operating MCS).

[0098] However, in some cases, the technique of updating the time and frequency tracking loop estimates may increase synchronization reference signal overhead (SSB and TRS overhead) and will limit UE sleep time opportunities and the duration of sleep time opportunities, which may result in reduced power efficiency and battery life of UE 115-a. Although denser inter-slot DMRS patterns may increase channel estimation accuracy and reduce phase offset errors, increasing the density of the DMRS pattern may also increase downlink signaling overhead.

[0099] In order to mitigate the impact of residual accumulated STO across time slots while reducing overhead and processing complexity, the wireless communication system may support narrowband reference signals (or reference signaling patterns), such as TDRS implemented in addition to (or in addition to) the sparse inter-slot DMRS pattern for multi-slot allocation. In some examples, in addition to the multi-slot PDSCH allocation, the TDRS pattern may be allocated and may be coupled to the sparse inter-slot broadband DMRS pattern (e.g., the narrowband reference signal pattern may not be periodic in time, such as SSB, TRS, or any other synchronization reference signal for time and frequency tracking loops). In some examples, the TDRS pattern may be allocated with a higher inter-slot density (e.g., relative to the inter-slot DMRS pattern) achieved across the multi-slot allocation, and may support residual STO and timing drift estimation and correction for PDSCH intermediate slots between slots with DMRS. In some examples, TDRS may have reduced complexity compared to the allocation of broadband DMRS symbols, and may further support the reduction of residual STO and associated error vector magnitude (EVM).

[0100] In some examples, the inter-slot pattern and density of TDRS (and the bandwidth associated with the narrowband reference signal) can be dynamically configured based on multiple dynamic factors such as UE SNR, residual ppm error, timing drift rate, effective synchronization pilot signal or reference signal periodicity (e.g., effective rate of SSB+TRS+PDSCH allocation), and inter-slot DMRS pattern. In some examples, the TDRS signal waveform can be an SC-OFDM waveform allocated using continuous resource elements. In order to reduce overhead, the bandwidth occupied by the narrowband reference signal can be relatively low (e.g., compared to DMRS) but above a threshold to support accurate STO estimation. In this case, the bandwidth of TDRS can be dynamically configured to address different UE reception conditions (e.g., SNR or operating MCS).

[0101] In some examples, in addition to the sparse DMRS pattern, the network may also configure (e.g., via control signaling 215) a sparse inter-slot TDRS pattern to increase channel estimation accuracy while reducing complexity and signaling overhead. The inter-slot TDRS pattern may allow for lower power channel estimation relative to DMRS, and may allow for a higher sparsity level (or lower inter-slot density) of the inter-slot DMRS pattern to further reduce DMRS overhead, reduce UE complexity, and reduce power associated with channel estimation and equalization.

[0102] TDRS can be implemented to enhance channel estimation and correct uncompensated STO (due to inter-slot time drift that can cause phase deviation in the frequency domain or inter-slot interference in the time domain). For example, TDRS can be implemented for SC-OFDM on symbols or time slots between DMRS symbols. Thus, TDRS can take into account the time drift that may occur between relatively far DMRS symbols.

[0103] In some specific implementations, the network entity 105-a may use procedure 205 to multiplex TDRS with a downlink shared channel (e.g., PDSCH). Although the data in the PDSCH may be sent using an SC-FDM waveform, in order to capture the residual STO in the frequency domain based on the TDRS, the TDRS may be sent using an OFDM waveform. In order to multiplex TDRS (e.g., OFDM-based) and PDSCH (e.g., SC-FDM-based) on the same symbol, the network entity may first perform DFT pre-coding with size M applied to M PDSCH data symbols. The network entity 105-a may generate FD TDRS complex symbols and a TDRS pattern or sequence of size L. In some examples, the size L may be determined based on the UE allocated bandwidth or the PDSCH allocated bandwidth (e.g., N REs) and M (e.g., the number of PDSCH data symbols).

[0104] To enable the use of efficient discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) implementation algorithms, the TDRS size (e.g., L) may be determined by a threshold associated with the PDSCH data size (M) for the SC-OFDM waveform, where the full allocated size (N) for data carrying OFDM symbols is determined by 2 a ·3 b 5 c , where a, b, and c are positive integers. Accordingly, a valid TDRS size (L) value may be defined based on one or more values ​​of N and M, such that L=NM.

[0105] In some examples, the network entity 105-a may concatenate L TDRS resource elements and M post-DFT PDSCH resource elements into a single frequency domain vector of size N, which corresponds to the full PDSCH allocation size on an OFDM symbol without TDRS. The network entity 105-a may then apply an N-IFFT operation to the concatenated resource elements. The network entity 105-a may send the resulting time domain vector via a time domain signal (e.g., associated with a UE allocation at a scheduled time in a sub-THz band). In addition, the network entity 105-a may add a time domain sample vector based on the last K samples. In some cases, several UE allocations may be multiplexed together in the frequency domain, and several UE allocations may be concatenated in the frequency domain before an inverse fast Fourier transform (IFFT).

[0106] Since the ppm error is common to all layers or ports of the network entity 105-a, the introduced time drift will also be the same on all layers. Therefore, the network entity 105-a may assign TDRS to a single layer or port (e.g., the network entity 105-a may send data using two or more layers). Figure 2 The example depicted in exemplifies single layer transmission for both TDRS and PDSCH, but the procedure can be extended for more than single layer SC-OFDM PDSCH transmission scenarios without changing the TDRS allocation.

[0107] In addition to the multiplexing procedures for PDSCH and TDRS performed by the network entity 105-a, the UE 115-a may implement various techniques to receive and process the TDRS multiplexed with the PDSCH using procedure 210. The UE 115-a may apply N fast Fourier transform (FFT) operations to the received time domain vector, which contains the multiplexed TDRS and PDSCH samples. After the FFT operation, the UE 115-a may extract the resource elements corresponding to the TDRS and may use the resource elements to estimate the STO. In this case, the UE 115-a performs channel estimation based on the last DMRS symbol available before TDRS processing. The UE 115-a may implement channel estimation (CHEST) to perform minimum mean square error (MMSE) equalization and maximum ratio combining (MRC) on the TDRS resource elements. UE 115-a may estimate STO and may use the estimated STO to apply sampling offset timing correction to PDSCH resource elements in the frequency domain, including all next PDSCH symbols until the next TDRS or DMRS symbol opportunity. Additionally or alternatively, UE 115-a may correct PDSCH channel estimation based on the estimated STO.

[0108] In some other examples, UE 115-a may perform interpolation of the estimated STO for intermediate data OFDM symbols (e.g., between consecutive TDRS and DMRS symbols). After performing STO correction, UE 115-a may perform M IDFT operations on the PDSCH to extract the PDSCH TD symbols to be used for the remainder of the receiver chain processing.

[0109] Figure 3 An example of a wireless communication system 300 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is illustrated. For example, the wireless communication system 300 may support communication between a UE 115-b and a network entity 105-b, which may be a reference Figure 1 and Figure 2 Examples of corresponding devices described.

[0110] The wireless communication system 300 may be an example of a sub-THz system supporting high frequency communications. The wireless communication system 300 may employ a signaling pattern of sparse inter-slot DMRS and sparse inter-slot TDRS (which is complementary to the inter-slot DMRS pattern) across a multi-slot allocation 305, which may be used for additional or supplemental channel estimation between DMRS symbols. In this example, the multi-slot allocation 305 includes 8 slots (slot 1 to slot 8).

[0111] The network entity 105-b may send (e.g., via RRC, DCI, or other control signaling 315) an indication of a sparse inter-slot DMRS pattern (e.g., including symbols for DMRS 320) for a multi-slot allocation 305 (e.g., a giant allocation), where in this example, each slot duration is 14 symbols. Here, the DMRS pattern indicates one symbol of DMRS 320 (e.g., the 4th symbol in slot 1) across 8 slots of the multi-slot allocation 305 (or 1 symbol every 8 slots). The network entity 105-b may send the control signaling 315 via a physical downlink control channel (PDCCH). In some examples, the control signaling 315 may also indicate a sparse inter-slot TDRS pattern (e.g., including TDRS 325) that is complementary to the sparse inter-slot DMRS pattern. In this example, the sparse inter-slot TDRS pattern indicates one symbol of TDRS 325 in each of slots 3, slot 5, and slot 7 (or 3 symbols every 8 slots). In some examples, the inter-slot DMRS pattern can be RRC-configured by selecting a configuration option corresponding to the DMRS symbol allocation on the first slot from 8 consecutive slots of the multi-slot allocation 305. Additionally or alternatively, the TDRS inter-slot pattern can be configured or signaled so that the inter-slot TDRS pattern is complementary to the inter-slot DMRS pattern. For example, in the multi-slot allocation 305, DMRS 320 is allocated according to the first inter-slot pattern, and TDRS 325 is allocated on the fourth symbol on each second slot where DMRS is not allocated, and STO estimation is allowed every 28 OFDM symbols. In this case, UE 115-b may perform STO correction based on STO estimation (e.g., zero-order hold) based on the most recent (e.g., closest in time) TDRS or DMRS symbol, or UE 115-b may perform STO correction based on linear interpolation between two estimates of consecutive TDRS and DMRS symbols. In some other examples, UE 115-b may implement STO forward prediction techniques to further take into account accumulated STO.

[0112] In some examples, the network entity 105-b may adjust the inter-slot TDRS pattern over time to align with a threshold (e.g., expected) measured residual (e.g., ppm err). In such examples, the inter-slot TDRS pattern may be designed so that the EVM degradation due to STO mismatch remains below a predefined threshold.

[0113] In some cases, the network entity 105-b may implement a single DCI schedule for multiple slots associated with the multi-slot allocation 305. In the case where a single DCI schedules multiple back-to-back slots, a subset of the scheduled slots may be allocated using symbols carrying DMRS (e.g., using a sparse inter-slot DMRS pattern) or symbols carrying supplemental TDRS allocations (e.g., using a sparse inter-slot TDRS pattern).

[0114] In some cases, a sparse inter-slot TDRS pattern may be allocated and applied based on whether UE 115-b also supports a sparse inter-slot DMRS pattern (e.g., based on corresponding UE capabilities for inter-slot DMRS). UE 115-b may send a capability to support TDRS to notify network entity 105-b of the capability to support inter-slot TDRS.

[0115] In some examples, the inter-slot DMRS pattern and the corresponding inter-slot TDRS pattern may be dynamically configured, statically configured, or semi-statically configured. For example, the configuration for the inter-slot DMRS and the inter-slot TDRS may be configured via RRC signaling, DCI, or MAC-CE. In one example, the inter-slot TDRS pattern on the multi-slot allocation 305 may be dynamically signaled based on a DCI coupled to the inter-slot DMRS pattern (e.g., using an additional bitmap in the DCI). In such examples, the inter-slot TDRS pattern may be dynamically signaled because the sensitivity of the residual uncorrected STO may be based on channel conditions (e.g., UE SNR, UE MCS), and because the residual time drift may be further based on the SNR (e.g., tracking loop accuracy).

[0116] In some other examples, the inter-slot TDRS pattern can be coupled to the MCS and inter-slot DMRS pattern via an RRC-configured table. For example, the entries of the RRC-configured table can be based on the MCS signaled in the DCI and the RRC-configured inter-slot DMRS pattern. In this case, the inter-slot TDRS pattern can be RRC-configured (e.g., rather than dynamically signaled).

[0117] In some implementations, the inter-slot TDRS pattern may be determined based on the inter-slot DMRS pattern. For example, the inter-slot TDRS pattern may reuse one or more DMRS configurations so that parameters configured for the DMRS (e.g., the first DMRS symbol position and DMRS sequence generation parameters) may also be reused or applied to the TDRS. In some examples, the TDRS may be assigned to a single port or a single layer (e.g., via RRC configuration or otherwise predefined), which should be quasi-co-located with one of the DMRS ports associated with the inter-slot DMRS.

[0118] In some cases, the TDRS position in the frequency domain (e.g., contiguous resource elements in the frequency domain) may be configured on the upper edge or lower edge of the data allocation (e.g., as predefined or configured and signaled via RRC, DCI, or MAC-CE). Additionally or alternatively, the TDRS bandwidth may be dynamically configurable (e.g., via DCI or MAC-CE), or may be coupled to the MCS index and allocated bandwidth based on the RRC-configured MCS and one or more allocation thresholds. In some examples, the transport block size may be based on the inter-slot TDRS allocation and the DMRS allocation. In some examples, the UE 115-b may implement rate matching for the DMRS 320, but may not implement rate matching for receiving the TDRS allocation.

[0119] In some cases, the sequence used to generate TDRS 325 can be a low peak-to-average power ratio (PAPR) sequence to complement the low PAPR conditions associated with SC-OFDM waveforms implemented for sub-THz systems. In some examples, the TDRS sequence can be the same as (or can be based on) one or more existing DMRS sequences, and various DMRS definitions and parameters can be reused for TDRS 325.

[0120] The use of inter-slot TDRS patterns may consume less power (from the perspective of both UE 115-b and network entity 105-b) and may have lower complexity than allocating a full DMRS 320 (e.g., one or more DMRS 320 per slot) for channel estimation. The use of additional TDRS patterns may also allow for higher sparsity levels (e.g., lower inter-slot density) for the inter-slot DMRS patterns to further reduce DMRS 320 overhead and UE complexity associated with channel estimation and equalization.

[0121] FIG.4 illustrates an example of a process flow 400 for supporting a signaling mode for TDRS according to one or more aspects of the present disclosure. The process flow 400 may be performed by a network entity 105-c and a UE 115-c, which may be examples of corresponding devices described herein. In some examples, the process flow 400 may illustrate an exemplary sequence of operations performed to support a complementary narrowband TDRS for a space-time slot inter-DMRS pattern in a sub-THz band. It will be understood that one or more operations described in the process flow 400 may be performed, omitted, replaced, supplemented, or combined with another operation earlier or later in the process. In addition, additional operations described herein that are not included in the process flow 400 may be included in the process flow 400.

[0122] At 405 , the UE 115 - c may send one or more messages indicating that the UE 115 - c supports the ability to receive DMRS and TDRS according to one or more signaling patterns.

[0123] At 410, the network entity 105-c may configure one or more first signaling modes (e.g., inter-slot DMRS modes) for one or more DMRS and one or more second signaling modes (e.g., inter-slot TDRS modes) for one or more TDRS, the first signaling mode corresponding to the second signaling mode.

[0124] At 415, the network entity 105-c may send one or more control messages, and the UE 115-c may receive one or more control messages, which indicate a first signaling mode for one or more DMRS via (e.g., one or more) TTI sets and a second signaling mode for one or more TDRS via a TTI set. In some cases, the network entity 105-c may send the first signaling mode and the second signaling mode based on the ability of the UE 115-c to support DMRS and TDRS. In some examples, the UE 115-c may receive a first indication of the first signaling mode via an RRC message, and may then receive a second indication of the second signaling mode via a DCI message. In some examples, the UE 115-c may receive a DCI message coupled with the first signaling mode via a bitmap included in the DCI message. In some examples, a sequence associated with one or more TDRS is configured as a low PAPR sequence.

[0125] In some specific implementations, the UE 115-c may receive a table via one or more control messages indicating a first (e.g., one or more) signaling pattern set for one or more DMRS, a second (e.g., one or more) signaling pattern set for one or more TDRS, and an MCS set associated with the first set of signaling patterns and the second set of signaling patterns. The UE 115-c may select a first signaling pattern from the first set of signaling patterns, a second signaling pattern from the second set of signaling patterns, and an MCS from the MCS set. In this case, based on the received table, the MCS is associated with the first signaling pattern and the second signaling pattern. In some examples, the UE 115-c may receive an indication of one or more allocated bandwidth thresholds associated with one or more TDRS. In such examples, the bandwidth associated with the one or more TDRS is based on the MCS and the one or more allocated bandwidth thresholds.

[0126] In some other examples, the UE 115-c may apply one or more parameters associated with the first signaling pattern (e.g., DMRS parameters such as a first DMRS position, one or more DMRS generation parameters) to obtain a second signaling pattern. In some examples, one or more TDRSs may be assigned to a single antenna port that is quasi-co-located with at least one antenna port associated with the one or more DMRSs. In some other examples, the UE 115-c may receive a frequency domain allocation for the one or more TDRSs, the frequency domain allocation indicating a first set of resources allocated for the one or more TDRSs relative to a second (e.g., one or more) set of resources allocated for data.

[0127] At 420, UE 115-c may receive a downlink shared channel (e.g., a PDSCH), one or more DMRSs, and a TDRS via a TTI set. In some examples, the downlink shared channel may be multiplexed with one or more DMRSs according to a first signaling mode, and may be multiplexed with one or more TDRSs according to a second signaling mode. In some examples, the first signaling mode may correspond to a first allocation periodicity of one or more DMRSs. UE 115-c may receive a downlink shared channel multiplexed with one or more TDRSs according to a second signaling mode. In this case, the second signaling mode may correspond to a second allocation periodicity associated with the first allocation periodicity (e.g., the second allocation periodicity may be complementary to the first allocation periodicity).

[0128] UE 115-c may receive one or more DMRS according to a first signaling pattern and a first allocation periodicity, and may receive one or more TDRS according to a second signaling pattern and a second allocation periodicity. In some examples, the second allocation periodicity may be greater than the first allocation periodicity (e.g., UE 115-c may receive TDRS more frequently than DMRS).

[0129] In some examples, UE 115-c may perform an STO calibration procedure based on the identified STO using one or more measurements associated with one or more DMRS of the first signaling mode, one or more TDRS of the second signaling mode, or both. In some cases, UE 115-c may perform an STO calibration procedure using measurements associated with the DMRS or TDRS that is closest in time to the identified STO. In some other cases, UE 115-c may perform a timing offset calibration procedure using measurements associated with one or more consecutive DMRS, one or more consecutive TDRS, or a linear interpolation between the two. In some examples, UE 115-c may receive an indication to adjust the second signaling mode based on the STO being greater than an STO threshold, and UE 115-c may receive one or more TDRS according to the adjusted second signaling mode.

[0130] Figure 5 A block diagram 500 of a device 505 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communication manager 520. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0131] The receiver 510 may provide means for receiving information associated with various information channels (e.g., a control channel, a data channel, an information channel related to a signaling pattern for TDRS), such as packets, user data, control information, or any combination thereof. The information may be communicated to other components of the device 505. The receiver 510 may utilize a single antenna or a collection of multiple antennas.

[0132] The transmitter 515 may provide means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 may transmit information associated with various information channels (e.g., control channels, data channels, information channels related to signaling patterns for TDRS) (such as packets, user data, control information, or any combination thereof). In some examples, the transmitter 515 may be co-located with the receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0133] The communication manager 520, the receiver 510, the transmitter 515, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of the signaling pattern for TDRS as described herein. For example, the communication manager 520, the receiver 510, the transmitter 515, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0134] In some examples, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured to or otherwise supports components for performing the functions described in the present disclosure. In some examples, a processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0135] Additionally or alternatively, in some examples, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functions described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0136] In some examples, communication manager 520 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 510, transmitter 515, or both. For example, communication manager 520 may receive information from receiver 510, transmit information to transmitter 515, or be integrated with receiver 510, transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.

[0137] According to the examples disclosed herein, the communication manager 520 may support wireless communication at the UE. For example, the communication manager 520 may be configured to or otherwise support a component for sending one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes. The communication manager 520 may be configured to or otherwise support a component for receiving one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set based on the ability of the UE, the first signaling mode corresponding to the second signaling mode. The communication manager 520 may be configured to or otherwise support a component for receiving a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with one or more DMRS according to the first signaling mode and multiplexed with one or more TDRS according to the second signaling mode.

[0138] By including or configuring a communication manager 520 according to the examples described herein, the device 505 (e.g., a processor controlling the receiver 510, the transmitter 515, the communication manager 520, or a combination thereof or otherwise coupled thereto) may support techniques for more efficient utilization of communication resources, lower sensitivity to residual tracking loop errors at high frequencies (e.g., sub-THz systems), and reduced processing complexity (e.g., some wideband DMRS-based channel estimates may be replaced by narrowband TDRS processing for residual STO mitigation).

[0139] Figure 6 A block diagram 600 of a device 605 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The device 605 may be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0140] The receiver 610 may provide means for receiving information associated with various information channels (e.g., a control channel, a data channel, an information channel related to a signaling pattern for TDRS), such as packets, user data, control information, or any combination thereof. The information may be communicated to other components of the device 605. The receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0141] The transmitter 615 may provide means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information associated with various information channels (e.g., control channels, data channels, information channels related to signaling patterns for TDRS) (such as packets, user data, control information, or any combination thereof). In some examples, the transmitter 615 may be co-located with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0142] Device 605 or its various components may be examples of components for performing various aspects of the signaling pattern for TDRS as described herein. For example, communication manager 620 may include reference signal capability component 625, signaling pattern identification component 630, downlink channel reception component 635, or any combination thereof. Communication manager 620 may be an example of various aspects of communication manager 520 as described herein. In some examples, communication manager 620 or its various components may be configured to perform various operations (e.g., receive, obtain, monitor, output, send) using or otherwise in conjunction with receiver 610, transmitter 615, or both. For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or integrate with receiver 610, transmitter 615, or both in combination to obtain information, output information, or perform various other operations as described herein.

[0143] According to the examples disclosed herein, the communication manager 620 may support wireless communication at the UE. The reference signal capability component 625 may be configured to or otherwise support a component for sending one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes. The signaling mode identification component 630 may be configured to or otherwise support a component for receiving one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set based on the UE's capabilities, the first signaling mode corresponding to the second signaling mode. The downlink channel reception component 635 may be configured to or otherwise support a component for receiving a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with one or more DMRS according to the first signaling mode and multiplexed with one or more TDRS according to the second signaling mode.

[0144] Figure 7 A block diagram 700 of a communication manager 720 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The communication manager 720 may be an example of aspects of the communication manager 520, the communication manager 620, or both as described herein. The communication manager 720 or its various components may be examples of components for performing various aspects of the signaling mode for TDRS as described herein. For example, the communication manager 720 may include a reference signal capability component 725, a signaling mode identification component 730, a downlink channel reception component 735, an STO correction component 740, a signaling mode modification component 745, a reference signal resource component 750, a signaling mode selection component 755, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0145] According to the examples disclosed herein, the communication manager 720 may support wireless communication at the UE. The reference signal capability component 725 may be configured to or otherwise support a component for sending one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes. The signaling mode identification component 730 may be configured to or otherwise support a component for receiving one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set based on the UE's capabilities, the first signaling mode corresponding to the second signaling mode. The downlink channel reception component 735 may be configured to or otherwise support a component for receiving a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with one or more DMRS according to the first signaling mode and multiplexed with one or more TDRS according to the second signaling mode.

[0146] In some examples, the first signaling mode corresponds to a first allocation periodicity of one or more DMRS, and the downlink channel receiving component 735 may be configured to or otherwise support components for receiving a downlink shared channel multiplexed with one or more TDRS according to a second signaling mode, the second signaling mode corresponding to a second allocation periodicity associated with the first allocation periodicity.

[0147] In some examples, the downlink channel receiving component 735 may be configured or otherwise support components for receiving one or more DMRS according to a first signaling pattern and a first allocation periodicity. In some examples, the downlink channel receiving component 735 may be configured or otherwise support components for receiving one or more TDRS according to a second signaling pattern and a second allocation periodicity, wherein the second allocation periodicity is greater than the first allocation periodicity.

[0148] In some examples, the STO correction component 740 may be configured as or otherwise support components for performing an STO calibration procedure based on an identified STO using one or more measurements associated with one or more DMRS of a first signaling mode, one or more TDRS of a second signaling mode, or both.

[0149] In some examples, to support performing an STO calibration procedure, the STO calibration component 740 may be configured as or otherwise support components for performing an STO calibration procedure using measurements associated with a demodulated reference signal or a time-shifted reference signal that is closest in time to the identified STO.

[0150] In some examples, to support performing an STO calibration procedure, the STO correction component 740 may be configured as or otherwise support components for performing an STO calibration procedure using measurements associated with one or more consecutive DMRS, one or more consecutive TDRS, or a linear interpolation between the two.

[0151] In some examples, the signaling pattern modification component 745 may be configured or otherwise support a component for receiving an indication that the second signaling pattern is adjusted based on the STO being greater than the STO threshold. In some examples, the downlink channel reception component 735 may be configured or otherwise support a component for receiving one or more TDRS according to the adjusted second signaling pattern.

[0152] In some examples, to support receiving one or more control messages, signaling mode identification component 730 may be configured or otherwise support means for receiving, via an RRC message, a first indication of a first signaling mode for one or more DMRS. In some examples, to support receiving one or more control messages, signaling mode identification component 730 may be configured or otherwise support means for receiving, via a DCI message, an indication of a second signaling mode for one or more TDRS in accordance with the RRC message.

[0153] In some examples, signaling mode identification component 730 may be configured or otherwise support means for receiving a DCI message coupled with a first signaling mode via a bitmap included in the DCI message.

[0154] In some examples, to support receiving one or more control messages, the signaling pattern identification component 730 may be configured to or otherwise support components for receiving at least an indicated table via one or more control messages. In some examples, to support receiving one or more control messages, the signaling pattern identification component 730 may be configured to or otherwise support components for a first set of signaling patterns for one or more DMRS, the first set of signaling patterns including a first signaling pattern. In some examples, to support receiving one or more control messages, the signaling pattern identification component 730 may be configured to or otherwise support components for a second set of signaling patterns for one or more TDRS, the second set of signaling patterns including a second signaling pattern. In some examples, to support receiving one or more control messages, the signaling pattern identification component 730 may be configured to or otherwise support components for an MCS set associated with the first set of signaling patterns and the second set of signaling patterns.

[0155] In some examples, the signaling pattern selection component 755 may be configured to or otherwise support components for selecting a first signaling pattern from a first set of signaling patterns. In some examples, the signaling pattern selection component 755 may be configured to or otherwise support components for selecting a second signaling pattern from a second set of signaling patterns. In some examples, the signaling pattern selection component 755 may be configured to or otherwise support components for selecting an MCS from a set of MCSs, wherein the MCS is associated with the first signaling pattern and the second signaling pattern based on the table.

[0156] In some examples, the signaling pattern modification component 745 may be configured to or otherwise support components for applying one or more parameters associated with a first signaling pattern to obtain a second signaling pattern, the one or more parameters including a first demodulation reference signal position, one or more demodulation reference signal generation parameters, or both.

[0157] In some examples, one or more TDRS are assigned to a single antenna port that is quasi-co-located with at least one antenna port associated with one or more DMRS.

[0158] In some examples, reference signal resource component 750 may be configured or otherwise support components for receiving a frequency domain allocation of one or more TDRS, the frequency domain allocation indicating a first set of resources allocated for the one or more TDRS relative to a second set of resources allocated for data.

[0159] In some examples, reference signal resource component 750 may be configured to or support components for receiving an indication of one or more allocated bandwidth thresholds associated with one or more TDRS, where the bandwidth associated with the one or more TDRS is based on the MCS and the one or more allocated bandwidth thresholds.

[0160] In some examples, a sequence associated with one or more TDRS comprises a low peak-to-average power ratio sequence.

[0161] In some examples, the first signaling pattern includes an inter-slot demodulation reference signal pattern, and the second signaling pattern includes an inter-slot time shift reference signal pattern.

[0162] Figure 8A diagram of a system 800 including a device 805 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The device 805 may be an example of a device 505, a device 605, or a UE 115 as described herein, or include components thereof. The device 805 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, a memory 830, a code 835, and a processor 840. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 845).

[0163] I / O controller 810 can manage input and output signals of device 805. I / O controller 810 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 810 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 810 can utilize an operating system such as or another known operating system. Additionally or alternatively, I / O controller 810 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 810 may be implemented as part of a processor (such as processor 840). In some cases, a user may interact with device 805 via I / O controller 810 or via hardware components controlled by I / O controller 810.

[0164] In some cases, the device 805 may include a single antenna 825. However, in some other cases, the device 805 may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 815 may communicate bidirectionally via one or more antennas 825, a wired or wireless link, as described herein. For example, the transceiver 815 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 815 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 825 for transmission, and demodulating packets received from one or more antennas 825. The transceiver 815 or the transceiver 815 and the one or more antennas 825 may be examples of transmitters 515, transmitters 615, receivers 510, receivers 610, or any combination thereof or components thereof as described herein.

[0165] The memory 830 may include random access memory (RAM) and read-only memory (ROM). The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed by the processor 840, cause the device 805 to perform various functions described herein. The code 835 may be stored in a non-transitory computer-readable medium (such as system memory or another type of memory). In some cases, the code 835 may not be directly executable by the processor 840, but may (for example, when compiled and executed) cause the computer to perform the functions described herein. In some cases, the memory 830 may also contain, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0166] The processor 840 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, the processor 840 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 830) so that the device 805 performs various functions (e.g., various functions or tasks supporting a signaling mode for TDRS). For example, the device 805 or a component of the device 805 may include a processor 840 and a memory 830 coupled to or coupled to the processor 840, and the processor 840 and the memory 830 are configured to perform the various functions described herein.

[0167] According to the examples disclosed herein, the communication manager 820 may support wireless communication at the UE. For example, the communication manager 820 may be configured to or otherwise support a component for sending one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling modes. The communication manager 820 may be configured to or otherwise support a component for receiving one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set based on the ability of the UE, the first signaling mode corresponding to the second signaling mode. The communication manager 820 may be configured to or otherwise support a component for receiving a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with one or more DMRS according to the first signaling mode and multiplexed with one or more TDRS according to the second signaling mode.

[0168] By including or configuring a communication manager 820 according to the examples described herein, the device 805 may support techniques for: improved communication reliability, an improved user experience related to reduced processing and reduced processing complexity, more efficient communication resource utilization, improved processing power utilization, reduced synchronization reference signal overhead (e.g., SSB and TRS), reduced network power consumption, reduced UE power consumption, increased data rate, reduced DMRS overhead and reduced wideband DMRS allocation, and reduced STO errors.

[0169] In some examples, the communication manager 820 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 815, one or more antennas 825, or any combination thereof. Although the communication manager 820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 820 may be supported or performed by the processor 840, the memory 830, the code 835, or any combination thereof. For example, the code 835 may include instructions that can be executed by the processor 840 to cause the device 805 to perform various aspects of the signaling pattern for TDRS as described herein, or the processor 840 and the memory 830 may be otherwise configured to perform or support such operations.

[0170] Fig. 9 A block diagram 900 of a device 905 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The device 905 may be an example of aspects of the network entity 105 as described herein. The device 905 may include a receiver 910, a transmitter 915, and a communication manager 920. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0171] The receiver 910 may provide means for obtaining (e.g., receiving, determining, identifying) information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). The information may be communicated to other components of the device 905. In some examples, the receiver 910 may support obtaining information by receiving signals via one or more antennas. Additionally or alternatively, the receiver 910 may support obtaining information by receiving signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof.

[0172] The transmitter 915 may provide a means for outputting (e.g., sending, providing, conveying, transmitting) information generated by other components of the device 905. For example, the transmitter 915 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, the transmitter 915 may support outputting information by sending signals via one or more antennas. Additionally or alternatively, the transmitter 915 may support outputting information by sending signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 915 and the receiver 910 may be co-located in a transceiver, which may include a modem or be coupled to a modem.

[0173] The communication manager 920, the receiver 910, the transmitter 915, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the signaling pattern for TDRS as described herein. For example, the communication manager 920, the receiver 910, the transmitter 915, or various combinations thereof or components thereof may support methods for performing one or more of the functions described herein.

[0174] In some examples, the communication manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microprocessor, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured as or otherwise supports components for performing the functions described in the present disclosure. In some examples, a processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0175] Additionally or alternatively, in some examples, the communication manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functions described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0176] In some examples, the communication manager 920 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with the receiver 910, the transmitter 915, or both. For example, the communication manager 920 may receive information from the receiver 910, transmit information to the transmitter 915, or be integrated with the receiver 910, the transmitter 915, or both to obtain information, output information, or perform various other operations as described herein.

[0177] For example, the communication manager 920 may be configured to or otherwise support a component for receiving one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The communication manager 920 may be configured to or otherwise support a component for sending one or more control messages indicating a first signaling pattern for one or more DMRS via a TTI set and a second signaling pattern for one or more TDRS via a TTI set based on the UE's capabilities, the first signaling pattern corresponding to the second signaling pattern. The communication manager 920 may be configured to or otherwise support a component for sending a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling pattern and multiplexed with the one or more TDRS according to the second signaling pattern.

[0178] By including or configuring a communication manager 920 according to the examples described herein, the device 905 (e.g., a processor controlling the receiver 910, the transmitter 915, the communication manager 920, or a combination thereof or otherwise coupled thereto) may support techniques for more efficient utilization of communication resources, lower sensitivity to residual tracking loop errors at high frequencies (e.g., sub-THz systems), and reduced processing complexity (e.g., some wideband DMRS-based channel estimates may be replaced by narrowband TDRS processing for residual STO mitigation).

[0179] Fig.10 A block diagram 1000 of a device 1005 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or the network entity 105 as described herein. The device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0180] Receiver 1010 may provide means for obtaining (e.g., receiving, determining, identifying) information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). The information may be communicated to other components of device 1005. In some examples, receiver 1010 may support obtaining information by receiving signals via one or more antennas. Additionally or alternatively, receiver 1010 may support obtaining information by receiving signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof.

[0181] The transmitter 1015 may provide means for outputting (e.g., sending, providing, conveying, transmitting) information generated by other components of the device 1005. For example, the transmitter 1015 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, the transmitter 1015 may support outputting information by sending signals via one or more antennas. Additionally or alternatively, the transmitter 1015 may support outputting information by sending signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1015 and the receiver 1010 may be co-located in a transceiver, which may include a modem or be coupled to a modem.

[0182] The device 1005 or its various components may be examples of components for performing various aspects of the signaling pattern for TDRS as described herein. For example, the communication manager 1020 may include a reference signal capability identification component 1025, a signaling pattern configuration component 1030, a downlink shared channel transmission component 1035, or any combination thereof. The communication manager 1020 may be an example of various aspects of the communication manager 920 as described herein. In some examples, the communication manager 1020 or its various components may be configured to use or otherwise cooperate with the receiver 1010, the transmitter 1015, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, the communication manager 1020 may receive information from the receiver 1010, transmit information to the transmitter 1015, or integrate with the receiver 1010, the transmitter 1015, or both to obtain information, output information, or perform various other operations as described herein.

[0183] The reference signal capability identification component 1025 may be configured to or otherwise support a component for receiving one or more messages indicating the ability of the UE to support receiving DMRS and TDRS according to one or more signaling patterns. The signaling pattern configuration component 1030 may be configured to or otherwise support a component for sending one or more control messages indicating a first signaling pattern for one or more DMRS via a TTI set and a second signaling pattern for one or more TDRS via a TTI set based on the capability of the UE, the first signaling pattern corresponding to the second signaling pattern. The downlink shared channel transmission component 1035 may be configured to or otherwise support a component for transmitting a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with one or more DMRS according to the first signaling pattern and multiplexed with one or more TDRS according to the second signaling pattern.

[0184] Fig.11 A block diagram 1100 of a communication manager 1120 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The communication manager 1120 may be an example of aspects of the communication manager 920, the communication manager 1020, or both as described herein. The communication manager 1120 or its various components may be examples of components for performing various aspects of the signaling mode for TDRS as described herein. For example, the communication manager 1120 may include a reference signal capability identification component 1125, a signaling mode configuration component 1130, a downlink shared channel transmission component 1135, a signaling mode modification component 1140, a reference signal resource component 1145, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses), which may include communication within a protocol layer of a protocol stack, associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with a network entity 105, between devices, components, or virtualized components associated with a network entity 105), or any combination thereof.

[0185] The reference signal capability identification component 1125 may be configured to or otherwise support a component for receiving one or more messages indicating the UE's ability to support receiving DMRS and TDRS according to one or more signaling patterns. The signaling pattern configuration component 1130 may be configured to or otherwise support a component for sending one or more control messages indicating a first signaling pattern for one or more DMRS via a TTI set and a second signaling pattern for one or more TDRS via a TTI set based on the UE's capabilities, the first signaling pattern corresponding to the second signaling pattern. The downlink shared channel transmission component 1135 may be configured to or otherwise support a component for transmitting a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with one or more DMRS according to the first signaling pattern and multiplexed with one or more TDRS according to the second signaling pattern.

[0186] In some examples, the first signaling mode corresponds to a first allocation periodicity of one or more DMRS, and the downlink shared channel transmitting component 1135 may be configured as or otherwise support components for transmitting a downlink shared channel multiplexed with one or more TDRS according to a second signaling mode, the second signaling mode corresponding to a second allocation periodicity associated with the first allocation periodicity.

[0187] In some examples, the downlink shared channel transmission component 1135 may be configured or otherwise support components for transmitting one or more DMRS according to a first signaling pattern and a first allocation periodicity. In some examples, the downlink shared channel transmission component 1135 may be configured or otherwise support components for transmitting one or more TDRS according to a second signaling pattern and a second allocation periodicity, wherein the second allocation periodicity is greater than the first allocation periodicity.

[0188] In some examples, the signaling pattern modification component 1140 may be configured to or otherwise support a component for adjusting the second signaling pattern based on the identified STO being greater than the STO threshold. In some examples, the downlink shared channel transmission component 1135 may be configured to or otherwise support a component for transmitting one or more TDRS according to the adjusted second signaling pattern.

[0189] In some examples, to support sending one or more control messages, downlink shared channel transmitting component 1135 may be configured or otherwise support means for transmitting, via an RRC message, a first indication of a first signaling pattern for one or more DMRS. In some examples, to support sending one or more control messages, downlink shared channel transmitting component 1135 may be configured or otherwise support means for transmitting, via a DCI message, an indication of a second signaling pattern for one or more TDRS in accordance with the RRC message.

[0190] In some examples, downlink shared channel transmitting component 1135 may be configured or otherwise support means for transmitting a DCI message coupled with the first signaling pattern via a bitmap included in the DCI message.

[0191] In some examples, to support sending one or more control messages, the signaling pattern configuration component 1130 may be configured to or otherwise support components for sending at least an indicated table via one or more control messages. In some examples, to support sending one or more control messages, the signaling pattern configuration component 1130 may be configured to or otherwise support components for a first set of signaling patterns for one or more DMRS, the first set of signaling patterns including a first signaling pattern. In some examples, to support sending one or more control messages, the signaling pattern configuration component 1130 may be configured to or otherwise support components for a second set of signaling patterns for one or more TDRS, the second set of signaling patterns including a second signaling pattern. In some examples, to support sending one or more control messages, the signaling pattern configuration component 1130 may be configured to or otherwise support components for an MCS set associated with the first set of signaling patterns and the second set of signaling patterns.

[0192] In some examples, one or more TDRS are assigned to a single antenna port that is quasi-co-located with at least one antenna port associated with one or more DMRS.

[0193] In some examples, reference signal resource component 1145 may be configured to or otherwise support components for transmitting a frequency domain allocation of one or more TDRS, the frequency domain allocation indicating a first set of resources allocated for the one or more TDRS relative to a second set of resources allocated for data.

[0194] In some examples, reference signal resource component 1145 may be configured to or support components for receiving an indication of one or more allocated bandwidth thresholds associated with one or more TDRS, where the bandwidth associated with the one or more TDRS is based on the MCS and the one or more allocated bandwidth thresholds.

[0195] In some examples, a sequence associated with one or more TDRS comprises a low peak-to-average power ratio sequence.

[0196] In some examples, the first signaling pattern includes an inter-slot demodulation reference signal pattern, and the second signaling pattern includes an inter-slot time shift reference signal pattern.

[0197] Fig.12 A diagram of a system 1200 including a device 1205 supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a network entity 105 as described herein, or include components thereof. The device 1205 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, which may include communication through one or more wired interfaces, through one or more wireless interfaces, or any combination thereof. The device 1205 may include components that support output and acquisition of communications, such as a communication manager 1220, a transceiver 1210, an antenna 1215, a memory 1225, a code 1230, and a processor 1235. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1240).

[0198] The transceiver 1210 may support bidirectional communication via a wired link, a wireless link, or both, as described herein. In some examples, the transceiver 1210 may include a wired transceiver and may communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some examples, the transceiver 1210 may include a wireless transceiver and may communicate bidirectionally with another wireless transceiver. In some examples, the device 1205 may include one or more antennas 1215 that may be capable of (e.g., concurrently) sending or receiving wireless transmissions. The transceiver 1210 may also include a modem for modulating a signal, providing the modulated signal for transmission (e.g., by one or more antennas 1215, by a wired transmitter), receiving the modulated signal (e.g., from one or more antennas 1215, from a wired receiver), and demodulating the signal. In some implementations, the transceiver 1210 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 1215 configured to support various receiving or obtaining operations or one or more interfaces coupled to one or more antennas 1215 configured to support various sending or outputting operations, or a combination thereof. In some implementations, the transceiver 1210 may include or be configured to be coupled to one or more processors or memory components that are operable to perform the following operations: perform or support operations based on received or obtained information or signals; or generate information or other signals for transmission or other output, or any combination thereof. In some implementations, the transceiver 1210, or the transceiver 1210 and one or more antennas 1215, or the transceiver 1210 and one or more antennas 1215 and one or more processors or memory components (e.g., processor 1235, or memory 1225, or both) may be included in a chip or chip assembly installed in the device 1205. The transceiver 1210 or the transceiver 1210 and one or more antennas 1215 or a wired interface (where applicable) may be an example of a transmitter 915, a transmitter 1015, a receiver 910, a receiver 1010, or any combination thereof or any component thereof as described herein. In some examples, the transceiver may be operable to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, midhaul communication link 162, fronthaul communication link 168).

[0199] Memory 1225 may include RAM and ROM. Memory 1225 may store computer-readable, computer-executable code 1230 including instructions that, when executed by processor 1235, cause device 1205 to perform various functions described herein. Code 1230 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 1230 may not be directly executable by processor 1235, but may (e.g., when compiled and executed) cause a computer to perform the functions described herein. In some cases, memory 1225 may also contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0200] Processor 1235 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA, a microcontroller, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any combination thereof). In some cases, processor 1235 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 1235. Processor 1235 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1225) so that device 1205 performs various functions (e.g., various functions or tasks supporting a signaling mode for TDRS). For example, device 1205 or a component of device 1205 may include processor 1235 and memory 1225 coupled to processor 1235, and processor 1235 and memory 1225 are configured to perform various functions described herein. The processor 1235 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, a virtual machine, or a container example) that may host functions for performing the functions of the device 1205 (e.g., by executing code 1230). The processor 1235 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in the device 1205 (such as in the memory 1225). In some specific implementations, the processor 1235 may be a component of a processing system. A processing system may generally refer to a system or a series of machines or components that receive inputs and process these inputs to produce an output set (which may be passed to other systems or components of the device 1205, for example). For example, the processing system of the device 1205 may refer to a system including various other components or subcomponents of the device 1205, such as the processor 1235, or the transceiver 1210, or the communication manager 1220, or other components or combinations of components of the device 1205. The processing system of device 1205 can be docked with other components of device 1205, and can process information (such as input or signal) received from other components, or output information to other components. For example, a chip or modem of device 1205 may include a processing system and an interface for outputting information or for obtaining information or both. The interface may be implemented as or otherwise include a first interface configured to output information and a second interface configured to obtain information. In some specific implementations, the first interface may refer to an interface between the processing system of the chip or modem and a transmitter, so that device 1205 can send information output from the chip or modem. In some specific implementations, the second interface may refer to an interface between the processing system of the chip or modem and a receiver, so that device 1205 can obtain information or signal input, and the information can be passed to the processing system.Those of ordinary skill in the art will readily appreciate that the first interface may also obtain information or signal input, and the second interface may also output information or signal output.

[0201] In some examples, bus 1240 may support communications of a protocol layer (e.g., within a protocol layer) of a protocol stack. In some examples, bus 1240 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack), which may include communications performed within a component of device 1205, or communications performed between different components of device 1205 that may be co-located or located in different locations (e.g., where device 1205 may refer to a system in which one or more of communication manager 1220, transceiver 1210, memory 1225, code 1230, and processor 1235 may be located in one of these different components or divided between different components).

[0202] In some examples, the communication manager 1220 may manage aspects of communications with the core network 130 (e.g., via one or more wired or wireless backhaul links). For example, the communication manager 1220 may manage the delivery of data communications for client devices, such as one or more UEs 115. In some examples, the communication manager 1220 may manage communications with other network entities 105 and may include a controller or scheduler for controlling communications with the UE 115 in coordination with the other network entities 105. In some examples, the communication manager 1220 may support an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between network entities 105.

[0203] For example, the communication manager 1220 may be configured to or otherwise support a component for receiving one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The communication manager 1220 may be configured to or otherwise support a component for sending one or more control messages indicating a first signaling pattern for one or more DMRS via a TTI set and a second signaling pattern for one or more TDRS via a TTI set based on the UE's capabilities, the first signaling pattern corresponding to the second signaling pattern. The communication manager 1220 may be configured to or otherwise support a component for sending a downlink shared channel, one or more DMRS, and TDRS via a TTI set, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling pattern and multiplexed with the one or more TDRS according to the second signaling pattern.

[0204] By including or configuring a communication manager 1220 according to the examples described herein, the device 1205 may support techniques for: improved communication reliability, an improved user experience related to reduced processing and reduced processing complexity, more efficient communication resource utilization, improved processing power utilization, reduced synchronization reference signal overhead (e.g., SSB and TRS), reduced network power consumption, reduced UE power consumption, increased data rates, reduced DMRS overhead and reduced wideband DMRS allocation, and reduced STO errors.

[0205] In some examples, the communication manager 1220 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with the transceiver 1210, one or more antennas 1215 (e.g., where applicable), or any combination thereof. Although the communication manager 1220 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1220 may be supported or performed by the processor 1235, the memory 1225, the code 1230, the transceiver 1210, or any combination thereof. For example, the code 1230 may include instructions that can be executed by the processor 1235 to cause the device 1205 to perform various aspects of the signaling pattern for TDRS as described herein, or the processor 1235 and the memory 1225 may be otherwise configured to perform or support such operations.

[0206] Fig.13 1 is a flowchart illustrating a method 1300 for supporting a signaling mode for TDRS according to one or more aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 8 The described UE 115 may be performed. In some examples, the UE may execute an instruction set to control the functional elements 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.

[0207] At 1305, the method may include sending one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The operations of 1305 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed as described in reference to Figure 7 The described reference signal capability component 725 is performed.

[0208] At 1310, the method may include receiving, based on the capabilities of the UE, one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set, the first signaling mode corresponding to the second signaling mode. The operations of 1310 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0209] At 1315, the method may include receiving a downlink shared channel, one or more DMRSs, and a TDRS via a set of TTIs, the downlink shared channel being multiplexed with the one or more DMRSs according to a first signaling pattern and with the one or more TDRSs according to a second signaling pattern. The operations of 1315 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed as described in reference to Figure 7 The described downlink channel receiving component 735 is performed.

[0210] Fig.14 1400 is a flowchart illustrating a method 1400 for supporting a signaling mode for TDRS according to one or more aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 8 The described UE 115 may be performed. In some examples, the UE may execute an instruction set to control the functional elements 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.

[0211] At 1405, the method may include sending one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The operations of 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Figure 7 The described reference signal capability component 725 is performed.

[0212] At 1410, the method may include receiving, based on the capabilities of the UE, one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set, the first signaling mode corresponding to the second signaling mode. The operations of 1410 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0213] At 1415, the method may include receiving a downlink shared channel, one or more DMRSs, and a TDRS via a set of TTIs, the downlink shared channel being multiplexed with the one or more DMRSs according to a first signaling pattern and with the one or more TDRSs according to a second signaling pattern. The operations of 1415 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed as described in reference to Figure 7 The described downlink channel receiving component 735 is performed.

[0214] At 1420, the method may include receiving a downlink shared channel multiplexed with one or more TDRS according to a second signaling pattern, the second signaling pattern corresponding to a second allocation periodicity associated with the first allocation periodicity. The operations of 1420 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1420 may be performed as described in reference to Figure 7 The described downlink channel receiving component 735 is performed.

[0215] Fig.15 1 is a flowchart illustrating a method 1500 for supporting a signaling mode for TDRS according to one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 8 The described UE 115 may be performed. In some examples, the UE may execute an instruction set to control the functional elements 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.

[0216] At 1505, the method may include sending one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The operations of 1505 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed as described in reference to Figure 7 The described reference signal capability component 725 is performed.

[0217] At 1510, the method may include receiving, based on the capabilities of the UE, one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set, the first signaling mode corresponding to the second signaling mode. The operations of 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0218] At 1515, the method may include receiving a downlink shared channel, one or more DMRSs, and a TDRS via a set of TTIs, the downlink shared channel being multiplexed with the one or more DMRSs according to a first signaling pattern and with the one or more TDRSs according to a second signaling pattern. The operations of 1515 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed as described in reference to Figure 7 The described downlink channel receiving component 735 is performed.

[0219] At 1520, the method may include performing an STO calibration procedure based on the identified STO using one or more measurements associated with one or more DMRS of the first signaling pattern, one or more TDRS of the second signaling pattern, or both. The operations of 1520 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed as described in reference to Figure 7 The described STO correction component 740 is performed.

[0220] Fig.16 1 is a flowchart illustrating a method 1600 for supporting a signaling mode for TDRS according to one or more aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 8 The described UE 115 may be performed. In some examples, the UE may execute an instruction set to control the functional elements 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.

[0221] At 1605, the method may include sending one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The operations of 1605 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1605 may be performed as described in reference to Figure 7 The described reference signal capability component 725 is performed.

[0222] At 1610, the method may include receiving, based on the capabilities of the UE, one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set, the first signaling mode corresponding to the second signaling mode. The operations of 1610 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0223] At 1615, the method may include receiving a first indication of a first signaling pattern for one or more DMRSs via an RRC message. The operations of 1615 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0224] At 1620, the method may include receiving a second indication of a second signaling mode for one or more TDRSs via a DCI message in accordance with the RRC message indicating a second signaling mode. The operations of 1620 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1620 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0225] At 1625, the method may include receiving a downlink shared channel, one or more DMRSs, and a TDRS via a set of TTIs, the downlink shared channel being multiplexed with the one or more DMRSs according to a first signaling pattern and with the one or more TDRSs according to a second signaling pattern. The operations of 1625 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1625 may be performed as described in reference to Figure 7 The described downlink channel receiving component 735 is performed.

[0226] Fig.17 A flow chart illustrating a method 1700 for supporting a signaling mode for TDRS according to one or more aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 8 The described UE 115 may be performed. In some examples, the UE may execute an instruction set to control the functional elements 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.

[0227] At 1705, the method may include sending one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The operations of 1705 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1705 may be performed as described in reference to Figure 7 The described reference signal capability component 725 is performed.

[0228] At 1710, the method may include receiving, based on the capabilities of the UE, one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set, the first signaling mode corresponding to the second signaling mode. The operations of 1710 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1710 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0229] At 1715, the method may include receiving at least the indicated table via one or more control messages. The operations of 1715 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1715 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0230] At 1720, the method may include a first set of signaling patterns for one or more DMRSs, the first set of signaling patterns including a first signaling pattern. The operations of 1720 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1720 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0231] At 1725, the method may include a second set of signaling patterns for one or more TDRSs, the second set of signaling patterns including a second signaling pattern. The operations of 1725 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1725 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0232] At 1730, the method may include an MCS set associated with the first set of signaling patterns and the second set of signaling patterns. The operations of 1730 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1730 may be performed as described in reference to Figure 7 The described signaling mode identification component 730 is performed.

[0233] At 1735, the method may include receiving a downlink shared channel, one or more DMRSs, and a TDRS via a set of TTIs, the downlink shared channel being multiplexed with the one or more DMRSs according to a first signaling pattern and with the one or more TDRSs according to a second signaling pattern. The operations of 1735 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1735 may be performed as described in reference to Figure 7 The described downlink channel receiving component 735 is performed.

[0234] Fig.18 1 is a flow chart illustrating a method 1800 for supporting a signaling mode for TDRS according to one or more aspects of the present disclosure. The operations of the method 1800 may be implemented by a network entity or a component thereof as described herein. For example, the operations of the method 1800 may be implemented by a network entity or a component thereof as described in reference to Figures 1 to 4 as well as Figures 9 to 12 The network entity described herein may be executed by the network entity. In some examples, the network entity may execute an instruction set to control the functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may use dedicated hardware to perform various aspects of the described functions.

[0235] At 1805, the method may include receiving one or more messages indicating that the UE supports the ability to receive DMRS and TDRS according to one or more signaling patterns. The operations of 1805 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1805 may be performed as described in reference to Fig.11 The described reference signal capability identification component 1125 is performed.

[0236] At 1810, the method may include sending one or more control messages indicating a first signaling mode for one or more DMRS via a TTI set and a second signaling mode for one or more TDRS via a TTI set based on the capabilities of the UE, the first signaling mode corresponding to the second signaling mode. The operations of 1810 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1810 may be performed as described in reference Fig.11 The described signaling mode is configured by component 1130 to perform.

[0237] At 1815, the method may include sending a downlink shared channel, one or more DMRSs, and a TDRS via a set of TTIs, the downlink shared channel being multiplexed with the one or more DMRSs according to a first signaling pattern and with the one or more TDRSs according to a second signaling pattern. The operations of 1815 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1815 may be performed as described in reference to Fig.11 The downlink shared channel sending component 1135 described above is executed.

[0238] The following provides an overview of various aspects of the disclosure:

[0239] Aspect 1: A method for performing wireless communication at a UE, the method comprising: sending one or more messages indicating the UE's ability to support receiving DMRS and TDRS according to one or more signaling modes; receiving one or more control messages based at least in part on the capability of the UE, the one or more control messages indicating a first signaling mode for one or more DMRS via a set of sending time intervals and indicating a second signaling mode for one or more TDRS via the set of sending time intervals, the first signaling mode corresponding to the second signaling mode; and receiving a downlink shared channel, the one or more DMRS, and the TDRS via the set of sending time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling mode, and being multiplexed with the one or more TDRS according to the second signaling mode.

[0240] Aspect 2: A method according to Aspect 1, wherein the first signaling mode corresponds to a first allocation periodicity of the one or more DMRSs, and the method further includes: receiving the downlink shared channel multiplexed with the one or more TDRSs according to the second signaling mode, and the second signaling mode corresponds to a second allocation periodicity associated with the first allocation periodicity.

[0241] Aspect 3: According to the method described in Aspect 2, the method further includes: receiving the one or more DMRS according to the first signaling mode and the first allocation periodicity; and receiving the one or more TDRS according to the second signaling mode and the second allocation periodicity, wherein the second allocation periodicity is greater than the first allocation periodicity.

[0242] Aspect 4: According to the method described in any one of Aspects 1 to 3, the method further includes: performing an STO calibration procedure based at least in part on the identified STO using one or more measurements associated with the one or more DMRSs of the first signaling mode, the one or more TDRSs of the second signaling mode, or both.

[0243] Aspect 5: The method according to aspect 4, wherein performing the STO calibration procedure includes: performing the STO calibration procedure using measurements associated with a DMRS or TDRS that is closest in time to the identified STO.

[0244] Aspect 6: A method according to any one of Aspects 4 to 5, wherein performing the STO calibration procedure includes: performing the STO calibration procedure using measurements associated with one or more consecutive DMRSs, one or more consecutive TDRSs, or a linear interpolation between the two.

[0245] Aspect 7: According to the method described in any one of Aspects 4 to 6, the method further includes: receiving an indication to adjust the second signaling mode based at least in part on the STO being greater than an STO threshold; and receiving the one or more TDRS according to the adjusted second signaling mode.

[0246] Aspect 8: A method according to any one of Aspects 1 to 7, wherein receiving the one or more control messages includes: receiving a first indication of the first signaling mode used for the one or more DMRS via an RRC message; and receiving an indication of the second signaling mode via a DCI message based on the RRC message; and a second indication of the second signaling mode used for the one or more TDRS.

[0247] Aspect 9: The method according to aspect 8 further comprises: receiving the DCI message coupled with the first signaling mode via a bitmap included in the DCI message.

[0248] Aspect 10: A method according to any one of Aspects 1 to 9, wherein receiving the one or more control messages further comprises: receiving a table via the one or more control messages, the table at least indicating: a first set of signaling patterns for the one or more DMRSs, the first set of signaling patterns including the first signaling pattern; a second set of signaling patterns for the one or more TDRSs, the second set of signaling patterns including the second signaling pattern; and an MCS set associated with the first set of signaling patterns and the second set of signaling patterns.

[0249] Aspect 11: According to the method described in Aspect 10, the method also includes: selecting the first signaling mode from the first set of signaling modes; selecting the second signaling mode from the second set of signaling modes; selecting an MCS from the MCS set, wherein the MCS is associated with the first signaling mode and the second signaling mode at least partially based on the table.

[0250] Aspect 12: According to the method described in any one of Aspects 1 to 11, the method further includes: applying one or more parameters associated with the first signaling pattern to obtain the second signaling pattern, the one or more parameters including a first DMRS position, one or more DMRS generation parameters, or both.

[0251] Aspect 13: The method according to any one of aspects 1 to 12, wherein the one or more TDRSs are allocated to a single antenna port that is quasi-co-located with at least one antenna port associated with the one or more DMRSs.

[0252] Aspect 14: According to the method described in any one of Aspects 1 to 13, the method further includes: receiving a frequency domain allocation for the one or more TDRSs, the frequency domain allocation indicating a first set of resources allocated to the one or more TDRSs relative to a second set of resources allocated for data.

[0253] Aspect 15: According to the method described in any one of Aspects 1 to 14, the method further includes: receiving an indication of one or more allocated bandwidth thresholds associated with the one or more TDRSs, wherein the bandwidth associated with the one or more TDRSs is at least partially based on the MCS and the one or more allocated bandwidth thresholds.

[0254] Aspect 16: The method according to any one of aspects 1 to 15, wherein the sequence associated with the one or more TDRS comprises a low PAPR sequence.

[0255] Aspect 17: The method according to any one of aspects 1 to 16, wherein the first signaling pattern comprises an inter-slot DMRS pattern, and the second signaling pattern comprises an inter-slot TDRS pattern.

[0256] Aspect 18: A method for performing wireless communications at a network entity, the method comprising: receiving one or more messages indicating a UE's ability to support receiving DMRS and TDRS according to one or more signaling modes; sending one or more control messages based at least in part on the capability of the UE, the one or more control messages indicating a first signaling mode for one or more DMRS via a set of sending time intervals and indicating a second signaling mode for one or more TDRS via the set of sending time intervals, the first signaling mode corresponding to the second signaling mode; and sending a downlink shared channel, the one or more DMRS, and the TDRS via the set of sending time intervals, the downlink shared channel being multiplexed with the one or more DMRS according to the first signaling mode, and being multiplexed with the one or more TDRS according to the second signaling mode.

[0257] Aspect 19: A method according to Aspect 18, wherein the first signaling mode corresponds to a first allocation periodicity of the one or more DMRSs, and the method further includes: sending the downlink shared channel multiplexed with the one or more TDRSs according to the second signaling mode, and the second signaling mode corresponds to a second allocation periodicity associated with the first allocation periodicity.

[0258] Aspect 20: According to the method described in Aspect 19, the method also includes: sending the one or more DMRS according to the first signaling mode and the first allocation periodicity; and sending the one or more TDRS according to the second signaling mode and the second allocation periodicity, wherein the second allocation periodicity is greater than the first allocation periodicity.

[0259] Aspect 21: According to any one of Aspects 18 to 20, the method further includes: adjusting the second signaling pattern at least in part based on the identified STO being greater than an STO threshold; and sending the one or more TDRS according to the adjusted second signaling pattern.

[0260] Aspect 22: A method according to any one of Aspects 18 to 21, wherein sending the one or more control messages includes: sending a first indication of the first signaling mode used for the one or more DMRS via an RRC message; and sending an indication of the second signaling mode via a DCI message based on the RRC message; and a second indication of the second signaling mode used for the one or more TDRS.

[0261] Aspect 23: The method according to Aspect 22 further comprises: sending the DCI message coupled with the first signaling mode via a bitmap included in the DCI message.

[0262] Aspect 24: A method according to any one of Aspects 18 to 23, wherein sending the one or more control messages includes: sending a table via the one or more control messages, the table at least indicating: a first set of signaling patterns for the one or more DMRSs, the first set of signaling patterns including the first signaling pattern; a second set of signaling patterns for the one or more TDRSs, the second set of signaling patterns including the second signaling pattern; and an MCS set associated with the first set of signaling patterns and the second set of signaling patterns.

[0263] Aspect 25: The method according to any one of aspects 18 to 24, wherein the one or more TDRSs are allocated to a single antenna port that is quasi-co-located with at least one antenna port associated with the one or more DMRSs.

[0264] Aspect 26: According to the method described in any one of Aspects 18 to 25, the method further includes: sending a frequency domain allocation for the one or more TDRSs, the frequency domain allocation indicating a first set of resources allocated to the one or more TDRSs relative to a second set of resources allocated for data.

[0265] Aspect 27: According to the method described in any one of Aspects 18 to 26, the method further includes: receiving an indication of one or more allocated bandwidth thresholds associated with the one or more TDRSs, wherein the bandwidth associated with the one or more TDRSs is at least partially based on the MCS and the one or more allocated bandwidth thresholds.

[0266] Aspect 28: The method according to any one of aspects 18 to 27, wherein the sequence associated with the one or more TDRS comprises a low PAPR sequence.

[0267] Aspect 29: A method according to any one of aspects 18 to 28, wherein the first signaling pattern comprises an inter-slot DMRS pattern, and the second signaling pattern comprises an inter-slot TDRS pattern.

[0268] Aspect 30: An apparatus for performing wireless communications at a UE, the apparatus 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 1 to 17.

[0269] Aspect 31: An apparatus for wireless communication at a UE, the apparatus comprising at least one component for performing a method according to any one of aspects 1 to 17.

[0270] Aspect 32: A non-transitory computer-readable medium storing a code for wireless communication at a UE, the code comprising instructions executable by a processor to perform a method according to any one of aspects 1 to 17.

[0271] Aspect 33: A device comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform a method according to any one of Aspects 18 to 29.

[0272] Aspect 34: An apparatus comprising at least one component for performing the method according to any one of aspects 18 to 29.

[0273] Aspect 35: A non-transitory computer-readable medium storing code, the code comprising instructions executable by a processor to perform the method according to any one of aspects 18 to 29.

[0274] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0275] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques 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.

[0276] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0277] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0278] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as one or more instructions or codes of a computer-readable medium or sent using one or more instructions or codes of a computer-readable medium. Other examples and specific implementations are within the scope of this 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 different locations, including being distributed so that various parts of the functions are implemented at different physical locations.

[0279] Computer-readable medium includes both non-transient computer storage medium and communication medium, and the communication medium includes any medium that facilitates the transfer of computer program from one location to another location.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.By way of example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage device, disk storage device or other magnetic storage device or can be used for carrying or storing desired program code parts and any other non-transient medium that can be accessed by general or special-purpose computer or general or special-purpose processor in the form of instruction or data structure.In addition, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, fiber optic 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, disks and discs include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs. Disks can reproduce data magnetically and discs can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0280] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items introduced by 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" may 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".

[0281] The term "determining" encompasses a wide variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database or other data structure), ascertaining, etc. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Furthermore, "determining" may include parsing, retrieving, selecting, choosing, establishing, and other such similar actions.

[0282] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between the similar components. If only the first reference label is used in the specification, the description may apply to any of the similar components having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0283] 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," rather than "preferred" or "having advantages over other examples." The specific embodiments include specific details to provide an understanding of the described techniques. However, these techniques may be practiced 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.

[0284] The description herein is provided to enable one of ordinary skill in the art to implement 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. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), the method comprising: sending one or more messages indicating the UE supports a capability of receiving a demodulation reference signal and a time shifted reference signal according to one or more signaling patterns; receiving one or more control messages based at least in part on the capability of the UE, the one or more control messages indicating a first signaling pattern for one or more demodulation reference signals via a set of transmit time intervals and indicating a second signaling pattern for one or more time drift reference signals via the set of transmit time intervals, the first signaling pattern corresponding to the second signaling pattern; as well as A downlink shared channel, the one or more demodulation reference signals and the time drift reference signal are received via the transmission time interval set, the downlink shared channel is multiplexed with the one or more demodulation reference signals according to the first signaling mode, and is multiplexed with the one or more time drift reference signals according to the second signaling mode.

2. The method according to claim 1, wherein the first signaling pattern corresponds to a first allocation periodicity of the one or more demodulation reference signals, the method further comprising: The downlink shared channel multiplexed with the one or more time shifted reference signals according to the second signaling pattern is received, the second signaling pattern corresponding to a second allocation periodicity associated with the first allocation periodicity.

3. The method according to claim 2, further comprising: receiving the one or more demodulation reference signals periodically according to the first signaling pattern and the first allocation; as well as The one or more time shifted reference signals are received according to the second signaling pattern and the second allocation periodicity, wherein the second allocation periodicity is greater than the first allocation periodicity.

4. The method according to claim 1, further comprising: Based at least in part on the identified sampling timing offset, a sampling timing offset calibration procedure is performed using one or more measurements associated with the one or more demodulation reference signals of the first signaling pattern, the one or more time drift reference signals of the second signaling pattern, or both.

5. The method of claim 4, wherein performing the sampling timing offset calibration procedure comprises: The sampling timing offset correction procedure is performed using measurements associated with a demodulation reference signal or a time drift reference signal that is closest in time to the identified sampling timing offset.

6. The method of claim 4, wherein performing the sampling timing offset calibration procedure comprises: The sampling timing offset correction procedure is performed using measurements associated with one or more continuous demodulation reference signals, one or more continuous time drift reference signals, or a linear interpolation between the two.

7. The method according to claim 4, further comprising: receiving an indication to adjust the second signaling pattern based at least in part on the sampling timing offset being greater than a sampling timing offset threshold; as well as The one or more time shifted reference signals are received according to the adjusted second signaling pattern.

8. The method of claim 1 , wherein receiving the one or more control messages comprises: receiving, via a radio resource control message, a first indication of the first signaling pattern for the one or more demodulation reference signals; as well as In accordance with the radio resource control message, an indication of the second signaling pattern is received via a downlink control information message. A second indication of the second signaling pattern for the one or more time shifted reference signals is received.

9. The method according to claim 8, further comprising: The downlink control information message coupled with the first signaling pattern is received via a bitmap included in the downlink control information message.

10. The method of claim 1, wherein receiving the one or more control messages further comprises: Receiving, via the one or more control messages, a table, the table indicating at least: a first set of signalling patterns for the one or more demodulation reference signals, the first set of signalling patterns comprising the first signalling pattern; a second set of signalling patterns for the one or more time shifted reference signals, the second set of signalling patterns comprising the second signalling pattern; as well as A set of modulation and coding schemes associated with the first set of signalling patterns and the second set of signalling patterns.

11. The method according to claim 10, further comprising: selecting the first signalling pattern from a first set of signalling patterns; selecting the second signalling pattern from a second set of the signalling patterns; as well as A modulation and coding scheme is selected from the set of modulation and coding schemes, wherein the modulation and coding scheme is associated with the first signaling pattern and the second signaling pattern based at least in part on the table.

12. The method according to claim 1, further comprising: One or more parameters associated with the first signaling pattern are applied to obtain the second signaling pattern, the one or more parameters comprising a first demodulation reference signal position, one or more demodulation reference signal generation parameters, or both.

13. The method of claim 1, wherein the one or more time-shifted reference signals are assigned to a single antenna port that is quasi-co-located with at least one antenna port associated with the one or more demodulation reference signals.

14. The method according to claim 1, further comprising: A frequency domain allocation for the one or more time shifted reference signals is received, the frequency domain allocation indicating a first set of resources allocated for the one or more time shifted reference signals relative to a second set of resources allocated for data.

15. The method according to claim 1, further comprising: An indication of one or more allocated bandwidth thresholds associated with the one or more time drifted reference signals is received, wherein a bandwidth associated with the one or more time drifted reference signals is based at least in part on a modulation and coding scheme and the one or more allocated bandwidth thresholds.

16. The method of claim 1, wherein the sequence associated with the one or more time-shifted reference signals comprises a low peak-to-average power ratio sequence.

17. The method of claim 1, wherein the first signaling pattern comprises an inter-slot demodulation reference signal pattern and the second signaling pattern comprises an inter-slot time shift reference signal pattern.

18. A method for wireless communication at a network entity, the method comprising: receiving one or more messages indicating a user equipment (UE) supports a capability to receive a demodulation reference signal and a time shifted reference signal according to one or more signaling patterns; transmitting, based at least in part on the capability of the UE, one or more control messages indicating, via a set of transmission time intervals, a first signaling pattern for one or more demodulation reference signals and indicating, via the set of transmission time intervals, a second signaling pattern for one or more time drift reference signals, the first signaling pattern corresponding to the second signaling pattern; as well as A downlink shared channel, the one or more demodulation reference signals and the time drift reference signal are sent via the sending time interval set, the downlink shared channel is multiplexed with the one or more demodulation reference signals according to the first signaling mode, and is multiplexed with the one or more time drift reference signals according to the second signaling mode.

19. The method according to claim 18, wherein the first signaling pattern corresponds to a first allocation periodicity of the one or more demodulation reference signals, the method further comprising: The downlink shared channel multiplexed with the one or more time shifted reference signals according to the second signaling pattern is transmitted, the second signaling pattern corresponding to a second allocation periodicity associated with the first allocation periodicity.

20. The method according to claim 19, further comprising: periodically sending the one or more demodulation reference signals according to the first signaling pattern and the first allocation; as well as The one or more time shifted reference signals are sent according to the second signaling pattern and the second allocated periodicity, wherein the second allocated periodicity is greater than the first allocated periodicity.

21. The method according to claim 18, further comprising: adjusting the second signaling pattern based at least in part on the identified sampling timing offset being greater than a sampling timing offset threshold; as well as The one or more time drift reference signals are sent according to the adjusted second signaling pattern.

22. The method of claim 18, wherein sending the one or more control messages comprises: sending, via a radio resource control message, a first indication of the first signaling pattern for the one or more demodulation reference signals; as well as In accordance with the radio resource control message, an indication of the second signalling pattern is sent via a downlink control information message. A second indication of the second signalling pattern for the one or more time shifted reference signals.

23. The method according to claim 22, further comprising: The downlink control information message coupled with the first signaling pattern is sent via a bitmap included in the downlink control information message.

24. The method of claim 18, wherein sending the one or more control messages comprises: A table is sent via the one or more control messages, the table indicating at least: a first set of signalling patterns for the one or more demodulation reference signals, the first set of signalling patterns comprising the first signalling pattern; a second set of signalling patterns for the one or more time shifted reference signals, the second set of signalling patterns comprising the second signalling pattern; as well as A set of modulation and coding schemes associated with the first set of signalling patterns and the second set of signalling patterns.

25. The method of claim 18, wherein the one or more time-shifted reference signals are assigned to a single antenna port that is quasi-co-located with at least one antenna port associated with the one or more demodulation reference signals.

26. The method of claim 18, further comprising: A frequency domain allocation for the one or more time shifted reference signals is transmitted, the frequency domain allocation indicating a first set of resources allocated for the one or more time shifted reference signals relative to a second set of resources allocated for data.

27. The method according to claim 18, further comprising: An indication of one or more allocated bandwidth thresholds associated with the one or more time drifted reference signals is received, wherein a bandwidth associated with the one or more time drifted reference signals is based at least in part on a modulation and coding scheme and the one or more allocated bandwidth thresholds.

28. The method of claim 18, wherein the sequence associated with the one or more time-shifted reference signals comprises a low peak-to-average power ratio sequence.

29. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; and one or more instructions stored in the memory and executable by the processor to cause the apparatus to: sending one or more messages indicating the UE supports a capability of receiving a demodulation reference signal and a time shifted reference signal according to one or more signaling patterns; receiving one or more control messages based at least in part on the capability of the UE, the one or more control messages indicating a first signaling pattern for one or more demodulation reference signals via a set of transmit time intervals and indicating a second signaling pattern for one or more time drift reference signals via the set of transmit time intervals, the first signaling pattern corresponding to the second signaling pattern; as well as A downlink shared channel, the one or more demodulation reference signals and the time drift reference signal are received via the transmission time interval set, the downlink shared channel is multiplexed with the one or more demodulation reference signals according to the first signaling mode, and is multiplexed with the one or more time drift reference signals according to the second signaling mode.

30. An apparatus, comprising: processor; a memory coupled to the processor; and one or more instructions stored in the memory and executable by the processor to cause the apparatus to: receiving one or more messages indicating a user equipment (UE) supports a capability to receive a demodulation reference signal and a time shifted reference signal according to one or more signaling patterns; transmitting, based at least in part on the capability of the UE, one or more control messages indicating, via a set of transmission time intervals, a first signaling pattern for one or more demodulation reference signals and indicating, via the set of transmission time intervals, a second signaling pattern for one or more time drift reference signals, the first signaling pattern corresponding to the second signaling pattern; as well as A downlink shared channel, the one or more demodulation reference signals and the time drift reference signal are sent via the sending time interval set, the downlink shared channel is multiplexed with the one or more demodulation reference signals according to the first signaling mode, and is multiplexed with the one or more time drift reference signals according to the second signaling mode.

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