Adaptive configuration of demodulation reference signal

Abstract

Methods, systems, and devices for wireless communication are described. A UE can receive DMRS via multiple paths and map each path to a DMRS port. The UE can calculate a delay metric for the DMRS associated with each DMRS port. The UE can send the delay metric associated with each DMRS port to a network entity, and the network entity can configure a DMRS mode for subsequent resource blocks for the UE based on the delay metric. The UE can also determine the DMRS mode for subsequent resource blocks based on the delay metric and indicate the DMRS mode to the network entity. The DMRS mode can indicate a subset of DMRS for receiving at least one DMRS symbol of a subsequent resource block for one or more DMRS ports. For example, this subset may include DMRS ports associated with a large delay metric.

Description

Technical Field

[0001] The following discussion pertains to wireless communication, including the adaptive configuration of the demodulation reference signal. Background Technology

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can 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, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each supporting wireless communication of communication devices, which may be referred to as User Equipment (UE). Summary of the Invention

[0003] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting adaptive configuration of demodulation reference signals (DMRS). For example, the described techniques provide a UE receiving DMRS via multiple paths and mapping each path to a UE's DMRS port. The UE can calculate a delay metric (e.g., Doppler effect, path delay) for the DMRS associated with each DMRS port. In some cases, the UE can send one or more delay metrics among those associated with each DMRS port to a network entity, and the network entity can configure a DMRS mode for subsequent resource blocks for the UE based on the delay metrics. Additionally or alternatively, the UE can autonomously determine the DMRS mode for subsequent resource blocks based on the delay metrics and can indicate the determined DMRS mode to the network entity. The DMRS mode can indicate a subset of DMRS for receiving at least one DMRS symbol of a subsequent resource block for one or more DMRS ports. For example, this subset may include DMRS ports associated with large delay metrics (e.g., DMRS with a Doppler shift greater than a threshold, paths with path delays greater than a threshold). Therefore, UEs and network entities can use communication resources more efficiently by assigning resources to DMRS ports associated with DMRS ports that have large latency metrics.

[0004] A method for wireless communication by a UE is described. The method may include: monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; transmitting an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0005] An apparatus for wireless communication at a UE (e.g., a UE) is described. The processor may include one or more processors and one or more memories coupled to the processors. One or more processor-readable instructions may be stored in the memories and may be executed individually or jointly by the processors to cause the apparatus to: monitor a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; transmit indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and monitor a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the DMRS ports based on one or more path delays or one or more Doppler shifts.

[0006] Another apparatus for wireless communication at a UE (e.g., a UE) is described. The apparatus may include: components for monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; components for transmitting indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and components for monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0007] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by one or more processors to: monitor a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; transmit indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and monitor a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0008] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for selecting one or more DMRS ports from the set of DMRS ports that correspond to a path delay that satisfies a path delay threshold or a Doppler shift that satisfies a Doppler shift threshold.

[0009] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, sending an indication of one or more path delays or one or more Doppler shifts may include operations, features, components or instructions for sending one or more DMRS port numbers associated with one or more OFDM symbols in a second set of OFDM symbols, wherein monitoring of the second set of OFDM symbols may be performed based on the one or more DMRS port numbers.

[0010] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication of a DMRS mode based on one or more path delays or one or more Doppler shifts, wherein monitoring of a second set of OFDM symbols may be performed according to the DMRS mode.

[0011] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the DMRS mode indicates that subset of the set of DMRS ports.

[0012] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the DMRS mode indicates the CDM group of each DMRS in the second set of DMRS.

[0013] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the set of DMRS ports includes one or more port groups, and the subset includes at least one of the one or more port groups.

[0014] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a second set of OFDM symbols and a subset of that set of DMRS ports from a lookup table based on one or more path delays or one or more Doppler shifts.

[0015] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for receiving instructions on a lookup table.

[0016] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: measuring one or more path delays or one or more Doppler shifts of a first set of DMRSs; and mapping each DMRS in the first set of DMRSs to a port in the set of DMRS ports, wherein an indication of one or more path delays or one or more Doppler shifts may be sent based on the mapping.

[0017] A method for wireless communication by a network entity is described. The method may include: outputting a first set of DMRS via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; obtaining an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0018] An apparatus for wireless communication at a network entity (e.g., a network entity) is described. The processor may include one or more processors and one or more memories coupled to the processors. One or more processor-readable instructions may be stored in the memories and may be executed individually or jointly by the processors to cause the apparatus to: output a first set of DMRSs via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; obtain indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRSs, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and output a second set of DMRSs via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0019] Another apparatus for wireless communication at a network entity is described. The apparatus may include: components for outputting a first set of DMRS via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; components for obtaining an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and components for outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0020] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by one or more processors to: output a first set of DMRSs via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; obtain indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRSs, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and output a second set of DMRSs via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0021] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the subset of the set of DMRS ports includes one or more DMRS ports that correspond to a corresponding path delay that satisfies a path delay threshold or a corresponding Doppler shift that satisfies a Doppler shift threshold in one or more Doppler shifts.

[0022] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, receiving an indication of one or more path delays or one or more Doppler shifts may include operations, features, components or instructions for obtaining one or more DMRS port numbers associated with one or more OFDM symbols in a second set of OFDM symbols, wherein transmitting the second set of DMRS via the second set of OFDM symbols may be performed based on the one or more DMRS port numbers.

[0023] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for outputting indications of DMRS modes based on one or more path delays or one or more Doppler shifts, wherein the output of a second set of DMRS may be based on the DMRS mode.

[0024] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the DMRS mode indicates that subset of the set of DMRS ports.

[0025] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the DMRS mode indicates the CDM group of each DMRS in the second set of DMRS.

[0026] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the set of DMRS ports includes one or more port groups, and the subset includes at least one of the one or more port groups.

[0027] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a second set of OFDM symbols and a subset of that set of DMRS ports from a lookup table based on one or more path delays or one or more Doppler shifts.

[0028] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for outputting instructions to a lookup table. Attached Figure Description

[0029] Figure 1A block diagram of a device supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown.

[0030] Figure 2 A block diagram of a device supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown.

[0031] Figure 3 A block diagram of a communication manager supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown.

[0032] Figure 4 A diagram of a system including a device supporting adaptive configuration of DMRS, according to one or more aspects of this disclosure, is shown.

[0033] Figure 5 A flowchart illustrating a method for adaptive configuration supporting DMRS according to various aspects of this disclosure is shown.

[0034] Figure 6 A flowchart illustrating a method for adaptive configuration supporting DMRS according to various aspects of this disclosure is shown.

[0035] Figure 7 An example of a wireless communication system with an adaptive configuration supporting a demodulation reference signal (DMRS) according to one or more aspects of this disclosure is shown.

[0036] Figure 8 Examples of wireless communication systems and resource block diagrams supporting adaptive configurations of DMRS according to one or more aspects of this disclosure are shown.

[0037] Figure 9 Examples of path delay profiles and resource diagrams for adaptive configurations supporting DMRS according to one or more aspects of this disclosure are shown.

[0038] Figure 10 An example of a process flow for adaptive configuration of DMRS according to one or more aspects of this disclosure is shown.

[0039] Figure 11 and Figure 12 A block diagram of a device supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown.

[0040] Figure 13 A block diagram of an action response component supporting adaptive configuration of DMRS is shown, according to one or more aspects of this disclosure.

[0041] Figure 14 A diagram of a system including a device supporting adaptive configuration of DMRS, according to one or more aspects of this disclosure, is shown. Detailed Implementation

[0042] In some wireless communication systems, a network entity may assign one or more symbols of a resource block (e.g., which may include 14 symbols) as demodulation reference signal (DMRS) symbols and use them for DMRS transmission and reception. In some cases, each DMRS symbol may carry one or more DMRS (e.g., distinguished via one or more code division multiplexing (CDM) groups), which may be configured to receive from one or more DMRS ports (e.g., antenna ports) of a user equipment (UE). Additionally or alternatively, the UE may receive the one or more DMRS via multiple paths with different directions of arrival (DoA), such that one or more of these paths are associated with each DMRS port. In some cases, the network entity may assign a larger number of DMRS symbols per resource block (e.g., 2, 3, or 4 symbols) to allow estimation of the Doppler effect of the DMRS due to, for example, the UE moving at relatively high speeds (e.g., greater than 10 km / h, greater than 30 km / h, greater than 60 km / h). Conversely, due to factors such as different paths and associated DoA, one or more DMRSs in a DMRS may experience relatively small Doppler shifts or path delays. Therefore, in some cases, some DMRS symbols in the assigned DMRS symbols may utilize excessive communication resources to estimate the Doppler shift of the DMRS.

[0043] According to the techniques described herein, a UE can receive DMRS via multiple paths and can map each path to a UE's DMRS port. The UE can calculate a delay metric (e.g., Doppler effect, path delay) for the DMRS associated with each DMRS port. In some cases, the UE can send one or more of the calculated delay metrics associated with each DMRS port to a network entity, and the network entity can configure a DMRS mode for subsequent resource blocks for the UE based on the delay metrics. Additionally or alternatively, the UE can autonomously determine the DMRS mode for subsequent resource blocks based on the delay metrics and can indicate the determined DMRS mode to the network entity. The DMRS mode can indicate a subset of DMRS for receiving at least one DMRS symbol for a subsequent resource block from one or more DMRS ports. For example, this subset may include DMRS ports associated with large delay metrics (e.g., DMRS with a Doppler shift greater than a threshold, paths with path delays greater than a threshold). Therefore, the UE and network entity can use communication resources more efficiently by allocating resources to DMRS associated with DMRS ports with large delay metrics.

[0044] The various aspects of this disclosure are first described in the context of a wireless communication system. They are also described in the context of resource block diagrams, path delay profiles, and process flows. Furthermore, the various aspects of this disclosure are illustrated and described with reference to apparatus diagrams, system diagrams, and flowcharts related to adaptive configuration of the DMRS.

[0045] Figure 7 An example of a wireless communication system 100 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown. 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 under other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0046] Network entity 105 may be distributed across a geographical area to form wireless communication system 100, and may include devices employing different forms or having different capabilities. In various examples, network entity 105 may be referred to as a network element, mobility element, radio access network (RAN) node, or network equipment, etc. In some examples, network entity 105 and UE 115 may wirelessly communicate via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, network entity 105 may support coverage area 110 (e.g., a geographical coverage area) within which UE 115 and network entity 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographical area within which network entity 105 and UE 115 may support the transmission of signals according to one or more radio access technologies (RATs).

[0047] UE 115 can be distributed throughout the coverage area 110 of wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. UE 115 can be devices in different forms or with different capabilities. Figure 1 Some example UE 115s are illustrated herein. The UE 115 described herein can be able to support various types of devices (such as, e.g., ...). Figure 1 It communicates with other UEs (115 or network entity 105) as shown.

[0048] As described herein, nodes of the wireless communication system 100 (which may be referred to as network nodes or wireless nodes) may be network entity 105 (e.g., any network entity described herein), UE 115 (e.g., any UE described herein), network controller, apparatus, device, computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be UE 115. Alternatively, a node may be network entity 105. Furthermore, a first node may be configured to communicate with a second or third node. In one aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be UE 115. In another aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different from these examples. Similarly, references to UE 115, network entity 105, device, equipment, computing system, etc., may include disclosures of UE 115, network entity 105, device, equipment, computing system, etc., as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that a first node is configured to receive information from a second node.

[0049] In some examples, network entity 105 may communicate with core network 130, communicate with each other, or both. For example, network entity 105 may communicate with 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, network entities 105 may communicate with each other directly (e.g., directly between network entities 105) or indirectly (e.g., via core network 130) via backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, network entities 105 may communicate with each other via midhaul communication link 162 (e.g., according to midhaul interface protocol) or fronthaul communication link 168 (e.g., according to fronthaul interface protocol) or any combination thereof. Backhaul communication link 120, midhaul communication link 162, or fronthaul communication link 168 may be or include one or more wired links (e.g., electrical links, fiber optic links), one or more wireless links (e.g., radio links, wireless optical links), etc., or various combinations thereof. UE 115 can communicate with core network 130 via communication link 155.

[0050] One or more network entities in network entity 105 described herein may include or be referred to as base station 140 (e.g., transceiver base station, radio base station, NR base station, access point, radio transceiver, node B, evolved node B (eNodeB, eNB), next-generation node B or gigabit node B (any of which may be referred to as gNB), 5G NB, next-generation eNB (ng-eNB), home node B, home evolved node B, or other suitable terms). In some examples, network entity 105 (e.g., base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture that 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 base station 140).

[0051] In some examples, network entity 105 may be implemented in a decomposed architecture (e.g., a decomposed base station architecture, a decomposed RAN architecture) that can be configured to utilize protocol stacks physically or logically distributed across 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, 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. RU 170 may also be referred to as a radio headend, an intelligent radio headend, a remote radio headend (RRH), a remote radio unit (RRU), or a transmit / receive point (TRP). One or more components of network entity 105 in a decomposed RAN architecture may be co-located, or one or more components of network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 in a decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0052] The functional splitting among CU 160, DU 165, and RU 170 is flexible and can support different functionalities 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, or RU 170. For example, a protocol stack functional splitting can be used between CU 160 and DU 165, allowing CU 160 to support one or more layers of the protocol stack, and DU 165 to support one or more different layers of the protocol stack. In some examples, CU 160 can host higher protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functionalities and signaling (e.g., Radio Resource Control (RRC), Serving Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). CU 160 can connect to one or more DU 165 or RU 170, and one or more DU 165 or RU 170 can 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) functionality and signaling, and each can be at least partially controlled by CU 160. Additionally or alternatively, a protocol stack functional split can be employed between DU 165 and RU 170, such that DU 165 can support one or more layers of the protocol stack, and RU 170 can support one or more different layers of the protocol stack. DU 165 can support one or more different cells (e.g., via one or more RU 170). In some cases, functional decomposition between CU 160 and DU 165, or between DU 165 and RU 170, can be performed within the protocol layer (e.g., some functions of the protocol layer can be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer can be performed by different of CU 160, DU 165, or RU 170). CU 160 can be further functionally decomposed into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. CU 160 can be connected to one or more DU 165 via midhaul communication link 162 (e.g., F1, F1-c, F1-u), and DU 165 can be connected to one or more RU 170 via fronthaul communication link 168 (e.g., open fronthaul (FH) interface). In some examples, the midhaul communication link 162 or the fronthaul communication link 168 may be implemented based on the interfaces (e.g., channels) between the layers of the protocol stack, which are supported by the corresponding network entities 105 communicating via such communication links.

[0053] In a wireless communication system (e.g., wireless communication system 100), the infrastructure and spectrum resources for radio access can 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 node 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 DU 165s or one or more RU 170s may be partially controlled by one or more CU 160s associated with donor network entity 105 (e.g., 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 node 104) via supported access and backhaul links (e.g., backhaul communication link 120). IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB donor. The IAB-MT may include a separate set of antennas for relaying communication with UE 115, or may share the same antennas (e.g., those of RU 170) for access to IAB node 104 via DU 165 of IAB node 104. (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, 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 IAB node 104) may be configured to operate according to the techniques described herein.

[0054] In the context of applying the techniques described herein to a decomposed RAN architecture, one or more components of the decomposed RAN architecture can be configured to support adaptive configurations of DMRS as described herein. For example, some operations described as being performed by UE115 or network entity 105 (e.g., base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0055] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0056] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, network entities 105, and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 As shown.

[0057] UE 115 and network entity 105 can 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" can refer to a set of RF spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the RF spectrum band (e.g., a bandwidth portion (BWP)) operating 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 coordinating carrier operation, user data, or other signaling. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between network entity 105 and other devices can refer to communication between these devices and any part of network entity 105 (e.g., entity, sub-entity). For example, the terms “send,” “receive,” or “communicate” when referring to network entity 105 can refer to any part of the RAN’s network entity 105 (e.g., base station 140, CU160, DU 165, RU 170) communicating with another device (e.g., directly or via one or more other network entities 105).

[0058] In some examples, such as in carrier aggregation configurations, a carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute RF Channel Number (EARFCN)) and may be identified according to a channel grating used for discovery by UE 115. A carrier may operate in standalone mode, in which case initial acquisition and connection can be performed by UE 115 via that carrier, or the carrier may operate in non-standalone mode, in which case different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0059] The communication link 125 shown in the wireless communication system 100 may include downlink transmission (e.g., forward link transmission) from network entity 105 to UE 115, uplink transmission (e.g., return link transmission) from UE 115 to network entity 105, or both, as well as other transmission configurations. A carrier may carry downlink communication or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0060] A carrier may be associated with a specific bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one bandwidth in a set of bandwidths for a particular radio access technology (e.g., 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz). Devices of the wireless communication system 100 (e.g., network entity 105, UE 115, or both) may have hardware configurations that support communication using a specific carrier bandwidth, or may be configured to support communication using one carrier bandwidth in a set of carrier bandwidths. In some examples, the wireless communication system 100 may include network entity 105 or UE 115 that supports concurrent communication using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate using a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0061] The signal waveform transmitted via a carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, 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 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 decoding rate of the modulation scheme, or both), such that more resource elements (e.g., in the transmission duration) and higher-order modulation schemes correspond to higher communication rates. Wireless communication resources may refer to a combination of RF spectrum resources, temporal 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.

[0062] It can support one or more sets of parameters for a carrier, and the set of parameters may include subcarrier spacing ( (and cyclic prefix). A carrier can be divided into one or more BWPs with the same or different sets of parameters. In some examples, UE 115 can be configured to utilize multiple BWPs. In some examples, a single BWP of a carrier can be active at a given time, and the communication of UE 115 can be constrained to one or more active BWPs.

[0063] The time interval for network entity 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period. seconds, of which It can represent the supported subcarrier spacing, and The supported Discrete Fourier Transform (DFT) size can be represented. The time interval of the communication resource can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0064] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix appended to each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple 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., The duration of a symbol period is associated with a (number) sampling period. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0065] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0066] Depending on the technology, carriers can be used to multiplex physical channels for communication. One or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used, for example, to multiplex physical control channels and physical data channels for signaling via a downlink carrier. The control region (e.g., control resource set (CORESET)) of the physical control channel can be defined by a set of symbol periods and can extend across the system bandwidth of the carrier or a subset of that bandwidth. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more UEs in UE 115 can monitor or search for control regions to obtain control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a concatenated manner. The aggregation level of control channel candidates can 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 set may include: a common search space set configured to transmit control information to multiple UEs 115, and a UE-specific search space set used to transmit control information to a specific UE 115.

[0067] In some examples, network entity 105 (e.g., base station 140, RU 170) may be mobile, and thus provide communication coverage to 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 use the same or different radio access technologies to provide coverage for various coverage areas 110.

[0068] Wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communication may include private 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 prioritizing services, and such services may be used for public safety or general business applications. The terms “ultra-reliable,” “low-latency,” and “ultra-reliable low-latency” are used interchangeably herein.

[0069] In some examples, UE 115 may be configured to support direct communication with other UE 115s via device-to-device (D2D) communication link 135 (e.g., according to peer-to-peer (P2P), D2D, or sidelink protocols). In some examples, one or more UE 115s performing D2D communication in a group may be within the coverage area 110 of network entity 105 (e.g., base station 140, RU 170), which may support aspects of such D2D communication configured (e.g., scheduled by network entity 105). In some examples, one or more UE 115s in such a group may be outside the coverage area 110 of network entity 105, or may otherwise be unable or not configured to receive transmissions from network entity 105. In some examples, the group of UE 115s communicating via D2D communication may support a one-to-many (1:M) system, where each UE 115 transmits to each of the other UE 115s in the group. In some examples, network entity 105 may facilitate the scheduling of resources used for D2D communication. In other examples, D2D communication may be performed between UEs 115 without involving network entity 105.

[0070] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units), or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170) using vehicle-to-network (V2N) communication, or both.

[0071] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can 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), 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), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) for routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by network entity 105 (e.g., base station 140) associated with core network 130. User IP packets can be transferred through user plane entities, which provide IP address allocation and other functions. User plane entities can connect to one or more network operator IP services 150. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0072] Wireless communication system 100 can operate using one or more frequency bands in the range of 300 MHz to 300 GHz. Generally, the area from 300 MHz to 3 GHz is referred to as the Ultra High Frequency (UHF) band or decimeter band because the wavelength range is approximately 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 are sufficient to penetrate structures so that macrocells can provide service to UE 115 located indoors. Compared to communication using smaller frequencies and longer wavelengths in the lower frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, communication using UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0073] The wireless communication system 100 can also operate in the Ultra High Frequency (SHF) band (also known as the centimeter band) in the range of 3 GHz to 30 GHz or in the Extremely High Frequency (EHF) band (e.g., 30 GHz to 300 GHz) (also known as the millimeter band) using the spectrum. In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and network entity 105 (e.g., base station 140, RU170), and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, such techniques facilitate the use of antenna arrays within the device. However, compared to SHF or UHF transmissions, EHF transmissions may experience even greater attenuation and shorter range. The techniques disclosed herein can be adopted for transmissions using one or more different frequency bands, and the frequency band usage specified across these frequency bands may vary by country or regulatory authority.

[0074] Wireless communication system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, wireless communication system 100 may use unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to employ Licensed Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology. When operating with unlicensed RF spectrum, devices such as network entity 105 and UE 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation using unlicensed frequency bands may be combined with component carriers operating with licensed frequency bands based on carrier aggregation configurations (e.g., LAA). Operation using unlicensed spectrum may include downlink transmission, uplink transmission, P2P transmission, or D2D transmission, etc.

[0075] 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 techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of network entity 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with network entity 105 may be located at different geographical locations. Network entity 105 may include an antenna array having a collection of multiple rows and columns of antenna ports that network entity 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted via the antenna ports.

[0076] Network entity 105 or UE 115 may use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique may be referred to as spatial multiplexing. The multiple signals may be transmitted, for example, by a transmitting device via different antennas or different combinations of antennas. Similarly, the multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include: single-user MIMO (SU-MIMO), for which multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), for which multiple spatial layers are transmitted to multiple devices.

[0077] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., network entity 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating along a specific orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include applying amplitude shifts, phase shifts, or both to the signals carried via the antenna elements associated with the device by the transmitting or receiving device. The adjustments associated with each of these antenna elements may be defined by a beamforming weight set associated with a specific orientation (e.g., relative to the antenna array of the transmitting or receiving device or relative to some other orientation).

[0078] Network entity 105 or UE 115 may use beam scanning technology as part of beamforming operations. For example, network entity 105 (e.g., base station 140, RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by network entity 105 in different directions. For example, network entity 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmission along different beam directions may be used to identify (e.g., by a transmitting device (such as network entity 105) or by a receiving device (such as UE 115)) the beam direction for later transmission or reception by network entity 105.

[0079] Some signals (such as data signals associated with a specific receiving device) may be transmitted by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., the direction associated with a receiving device (such as receiving network entity 105 or receiving UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted along one or more beam directions. For example, UE 115 may receive one or more signals transmitted by network entity 105 in different directions and may report to network entity 105 an indication of signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0080] In some examples, transmissions performed by a device (e.g., network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital pre-decoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating pre-decoding weights for one or more beam directions, and this feedback may correspond to a set of beams configured across the system bandwidth or one or more sub-bands. Network entity 105 may transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may or may not be pre-decoded. UE 115 may provide feedback for beam selection, which may be a pre-decoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel codebook, linear combination codebook, port selection codebook). Although these techniques are described with reference to signals transmitted by network entity 105 (e.g., base station 140, RU 170) in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception), or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0081] A receiving device (e.g., UE 115) may perform reception operations according to multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a transmitting device (e.g., network entity 105). For example, the receiving device may perform reception according to multiple reception directions by: receiving via different antenna subarrays; processing the received signal according to different antenna subarrays; receiving according to different sets of reception beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing the received signal according to different sets of reception beamforming weights applied to signals received at multiple antenna elements of the antenna array. Any of these operations may be referred to as “listening” according to different reception configurations or reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when a data signal is received). A single receiver configuration can be aligned along a beam direction determined based on listening according to different receiver configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0082] UE 115 and network entity 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data via communication links (e.g., communication link 125, D2D communication link 135). HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific time slot for data received via a previous symbol in that time slot. In some other examples, the device may provide HARQ feedback in subsequent time slots or according to a different time interval.

[0083] In various scenarios, network entity 105 may assign one or more symbols of a resource block (e.g., which may include 14 symbols) as demodulation reference signal (DMRS) symbols and use them for the transmission and reception of DMRS between network entity 105 and UE 115. In some cases, each DMRS symbol may carry one or more DMRS (e.g., distinguished via one or more code division multiplexing (CDM) groups), which may be configured to receive one or more DMRS ports (e.g., antenna ports) of UE 115. UE 115 may receive DMRS via multiple paths and may map each path to a DMRS port of UE 115. UE 115 may calculate a delay metric (e.g., Doppler effect, path delay) for the DMRS associated with each DMRS port. In some cases, UE 115 may send the delay metric associated with each DMRS port to network entity 105, and network entity 105 may configure the DMRS mode for subsequent resource blocks to UE 115 based on the delay metric. Additionally or alternatively, UE 115 may autonomously determine the DMRS mode for subsequent resource blocks based on latency metrics and may indicate the determined DMRS mode to network entity 105. The DMRS mode may indicate a subset of DMRSs for receiving at least one DMRS symbol of a subsequent resource block for one or more DMRS ports. For example, this subset may include DMRS ports associated with large latency metrics (e.g., DMRSs with Doppler shift greater than a threshold, paths with path delays greater than a threshold). Therefore, UE 115 and network entity 105 can utilize communication resources more efficiently by assigning resources to DMRSs associated with DMRS ports with large latency metrics.

[0084] Figure 8Examples of adaptive configurations of wireless communication systems 800 and resource block diagrams 250, each supporting DMRS, are shown according to one or more aspects of this disclosure. In some cases, aspects of wireless communication system 800 and resource block diagram 250 may be implemented... Figure 1 These aspects or are implemented by these aspects. For example, the wireless communication system 800 and resource block diagram 250 may include network entity 105-a and UE 115-a, which may be respectively as described herein. Figure 1 Examples of network entity 105 and UE 115 described. In some respects, UE 115-a and network entity 105-a may perform adaptive configuration of DMRS based on one or more paths 205 for receiving DMRS and resource block 295 DMRS symbols 275.

[0085] In some wireless communication systems, one or more signals (e.g., DMRS) can propagate between two communication devices via multiple paths; this is known as multipath communication. For example, multipath propagation between a transmitter and a receiver can result in a signal from the transmitter reaching the receiver's receiving antenna via two or more paths. In some cases, the impulse response of a signal (e.g., the combined impulse response of a signal) can be modeled by the following equation:

[0086] Where L can represent the number of paths (e.g., signals, taps) in a multipath signal. It can represent the path delay associated with a multipath signal (e.g., average path delay, predicted path delay). This can represent the receiving path of a multipath signal. i Path delay, It can be expressed in time t Multipath signal receiving path i The complex coefficients, and It can represent the pulse delay function.

[0087] In some cases, multipath communication can enhance various aspects of wireless communication. For example, in some MIMO systems, network entities can implement multilayer transmission to use multipath communication to improve communication reliability. Network entities can also transmit reference signals (e.g., CSI-RS, DMRS) to the UE via multipath communication. In some cases, the UE can detect (e.g., measure) one or more aspects of the reference signal and send feedback CSI to the network entity based on the reference signal.

[0088] In some cases, multipath signaling between the UE and network entities may be affected by Doppler shift. For example, Doppler shift can be a change in the frequency of a radio signal (e.g., a wave) caused by movement of the receiving device relative to the transmitting device. To calculate the path for multipath communication... i The associated Doppler frequency can be obtained from the following formula for the UE:

[0089] in It can represent the speed of the UE. and Descendable path i The directional difference between the receiving angle and the UE's direction of travel. f c It can represent the transmission frequency of multipath communication, and c It can represent the speed of sound.

[0090] To account for the effects of Doppler shift in communication, network entities may transmit one or more additional DMRS symbols to the UE in one or more additional DMRS symbols within a resource block. The UE may receive the additional DMRS and use it to measure and account for the Doppler effect. For example, a network entity may configure a resource block for communication with the UE, wherein the resource block includes a certain number (e.g., 1, 2, 3, or 4) of DMRS symbols, with more DMRS symbols configured for cases involving a greater Doppler effect.

[0091] In some cases, the UE may receive DMRS via one or more ports (e.g., DMRS ports), where a port may include a combination of the UE's receiving antennas. In some wireless communication systems, each DMRS may be sent to a port of the UE (e.g., a port configured for the UE), and each DMRS symbol of a resource block (e.g., including additional DMRS symbols) may include DMRS for the same port. For example, in some wireless communication systems, if the first-time DMRS symbol of a resource block carries DMRS for a set of ports, any additional DMRS symbols of the resource block (e.g., later-time DMRS symbols) may carry DMRS for that same set of ports.

[0092] However, configuring resource blocks with multiple DMRS symbols can increase signaling overhead and reduce downlink throughput. Additionally or alternatively, feedback CSI in some wireless communication systems may become obsolete due to the mobility of receivers of DMRS symbols and associated changes in channel conditions, as the delay in the network entity generating the pre-decoder and applying it to downlink transmission can be too large. For example, the time elapsed between the UE receiving DMRS, sending feedback CSI to the network entity, and the network entity processing the CSI for use in downlink transmission can exceed 10 time slots. Because channel conditions between the network entity and the UE can change significantly during these 10 time slots, CSI feedback to the network entity may have limited value in setting transmit and receive parameters for future communications.

[0093] According to the techniques described herein, UE 115-a can estimate the per-path Doppler shift in multipath communication carrying one or more DMRS (e.g., by using Equation 1). In some cases, the per-path Doppler shift may depend on the velocity 210 of UE 115-a (e.g., travel speed, direction of travel), the angle of arrival (AoA) of each path 205 of the multipath communication, or other factors. The per-path Doppler shift can indicate how the channel associated with path 205 of the multipath communication changes over time. In some cases, UE 115-a can use contextual information perceived via one or more sensors (e.g., radar, camera, lidar) of UE 115-a to determine path 205 of the multipath communication and then calculate the per-path Doppler shift (e.g., based on per-path reflection).

[0094] Additionally or alternatively, UE 115-a may measure the path delay of each path 205. For example, it may determine the time difference between the scheduling time for receiving a signal (e.g., DMRS) via path 205 and the time when the signal is received via path 205. In some cases, the path delay of path 205 may be associated with the Doppler shift of path 205, such that an increase in path delay is associated with an increase in Doppler shift. Doppler shift, path delay, or both may be referred to as a delay metric or a path metric, and UE 115-a may use the delay metric when determining an adaptive configuration of DMRS.

[0095] For example, UE 115-a may receive multipath communication, including one or more DMRSs, from network entity 105-a via path 205 (e.g., path 205-a, path 205-b, path 205-c, and path 205-d). Due to the different corresponding beam or signal properties of each DMRS, each DMRS may reach UE 115-a via a different path 205. Different paths may reflect from one or more reflection candidates 215, resulting in different AoA at UE 115-a for different paths 205. In some cases, UE 115-a may be moving at speed 210 and may detect multipath communication arriving via path 205 within UE 115-a's field of view 220. In some cases, the DMRS may allow UE 115-a, network entity 105-a, or both to estimate latency metrics.

[0096] In some cases, network entity 105-a may transmit one or more DMRS symbols to UE 115-a in DMRS symbols 275 of resource block 295 (e.g., DMRS symbols 275-a and 275-b). DMRS symbols 275 may be OFDM symbols used for transmitting (e.g., and receiving) DMRS. In some cases, resource block 295 may include DMRS symbol 275-a (e.g., two symbols preceded by a DMRS symbol), which is followed by a number (e.g., 1, 2, 3) of additional DMRS symbols (e.g., including DMRS symbol 275-b).

[0097] In some cases, the number of DMRS symbols 275 in resource block 295 may be associated with Doppler shift estimation (e.g., calculating frequency offset when the channel is changing rapidly over time) and compensation (e.g., in medium- to high-speed scenarios). For example, when the speed 210 of UE 115-a is low (e.g., this reduces Doppler shift), resource block 295 may include fewer DMRS symbols 275 than when the speed 210 of UE 115-a is high (e.g., this increases Doppler shift).

[0098] In some cases, network entity 105-a may send each of one or more DMRSs to (e.g., a port configured for) UE 115-a (e.g., a receive port, a DMRS port). Additionally or alternatively, network entity 105-a may use some resources of resource block 295 to send DMRS to multiple ports simultaneously. For example, network entity 105-a may send DMRS to a first port 255 and a second port 260 of UE 115-a in one or more resources of DMRS symbol 275-a (e.g., via one or more carriers or subcarriers and in DMRS symbol 275-a), and network entity 105-a may send DMRS to a third port 265 and a fourth port 270 of UE 115-a in one or more other resources of DMRS symbol 275-a.

[0099] In some cases, UE 115-a may receive DMRS from network entity 105-a during DMRS symbol 275, and UE 115-a may estimate the Doppler shift associated with each DMRS. Since the DMRS may reach UE 115-b via different corresponding paths 205, and each DMRS is associated with a corresponding port of UE 115-a, UE 115-a may associate each Doppler shift with the same one or more DMRS and the port associated with one or more paths 205 (e.g., map each Doppler shift to a port). For example, UE 115-a may measure the Doppler shift associated with a first DMRS received via path 205-a for a first port 255, and may measure a second Doppler shift associated with a second DMRS received via path 205-b for a second port 260. Based on the measured Doppler shift and the CSI-RS associated with the DMRS, UE 115-a can send a feedback CSI to network entity 105-a (e.g., via the physical uplink control channel or the physical uplink shared channel), which indicates the Doppler shift. In some cases, network entity 105-a can generate a downlink pre-decoder based on the feedback CSI received from UE 115-a to enable multi-layer transmission to UE 115-a.

[0100] Although resource block 295 includes a certain number of symbols, frequencies, DMRS symbols 275 (e.g., four), and ports, the techniques described herein can be applied to any number of these aspects. For example, in some channel designs, configurations (e.g., higher-layer configurations) can support up to eight or twelve ports. Additionally or alternatively, the resources of resource block 295 can be used for uplink transmission, downlink transmission, or both.

[0101] Therefore, according to the techniques described herein, UE 115-a can utilize a smaller number of ports (e.g., a subset of ports) in the additional DMRS symbols to save signaling overhead. A smaller number of ports can be adaptively configured based on the delay metric associated with path 205 of the multipath signal, determined (e.g., measured, predicted) at UE 115-a.

[0102] UE 115-a can receive DMRS for per-path Doppler shift measurements via resource block 295. Resource block 295 can provide a four-port allocation (e.g., DMRS configuration type 1 on the frequency side). Additionally or alternatively, resource block 295 can include two code division multiplexing (CDM) groups, such that each resource of the resource block can carry two DMRSs simultaneously in different CDM groups, as described herein. As described herein, UE 115-a can receive DMRS via multiple DMRS symbols 275 of resource block 295, wherein each DMRS symbol 275 can be configured to correspond to a different DMRS port.

[0103] In some cases, based on UE 115-a's ability to detect Doppler shift, path delay, or both associated with each path 205 of a number of paths associated with the same DMRS (e.g., a multipath signal comprising multiple DMRSs), UE 115-a may determine one or more paths 205 experiencing low Doppler shift, low path delay, or both. UE 115-a may communicate with network entity 105-a to allocate fewer resources or no resources to the DMRS associated with the path (e.g., and therefore the port) experiencing low Doppler shift, low path delay, or both.

[0104] According to the techniques described herein, UE 115-a and network entity 105-a can adaptively configure DMRS based on path delay, Doppler shift, or both associated with DMRS. For example, network entity 105-a can transmit one or more DMRSs associated with DMRS ports and paths 205 during one or more DMRS symbols 275 of resource block 295. UE 115-a can receive DMRSs, map DMRSs to corresponding ports, and determine one or more delay metrics associated with each DMRS port of UE 115-a (e.g., associated with DMRSs corresponding to each DMRS port). Then, based on one or more delay metrics, UE 115-a and network entity 105-a can communicate to configure a DMRS mode that reduces overhead and saves wireless communication resources.

[0105] Figure 9Examples of path delay profile 900 and resource block diagram 350, each supporting adaptive configuration of DMRS according to one or more aspects of this disclosure, are shown. In some cases, aspects of path delay profile 300 and resource block diagram 350 may be implemented Figure 1 and Figure 2 These aspects or are implemented by these aspects. For example, the path delay profile 300 and resource block diagram 350 may include resource blocks 355 and DMRS symbols 360 (e.g., DMRS symbols 360-a, DMRS symbols 360-b, DMRS symbols 360-c, and DMRS symbols 360-d), which may be as described herein. Figure 2 Examples of resource block 295 and DMRS symbol 275 are described. In some cases, path delay profile 300 and resource block diagram 350 may be associated with a UE including four DMRS ports (e.g., UE115-a). However, the techniques described herein are scalable to include UEs with any number of DMRS ports. In some aspects, UE 115 may perform adaptive configuration of DMRS based on path delay profile 900 and resource block diagram 350.

[0106] According to the techniques described herein, a UE (e.g., UE 115-a) can detect (e.g., measure, determine) one or more delay metrics associated with a UE's DMRS port 305 (e.g., port, receive port, DMRS port 305-a, DMRS port 305-b, DMRS port 305-c, and DMRS port 305-d) based on a corresponding DMRS (e.g., one or more DMRS, DMRS in a multipath signal). For example, a path delay profile 300 can plot the magnitude of a DMRS received via the UE's DMRS port 305. One or more delay metrics may include path delay (e.g., in time) associated with a DMRS corresponding to DMRS port 305, Doppler shift (e.g., frequency change due to Doppler effect) associated with a DMRS corresponding to DMRS port 305, or both. In some cases, each DMRS may reach the UE via a path such that each DMRS (e.g., and therefore each path) may correspond to one DMRS port 305.

[0107] In some cases, the UE, network entity, or both may adaptively configure the DMRS symbol 360 based on the latency metric associated with each DMRS port 305. For example, the UE, network entity, or both may determine (e.g., receive, identify) a latency metric threshold 310 and may determine which DMRS ports 305 correspond to each DMRS symbol 360 based on the latency metric threshold 310.

[0108] For example, the delay metric threshold 310 may be a Doppler shift threshold, a path delay threshold, or both. In some cases, a DMRS port 305 associated with a delay metric that meets (e.g., is below) the delay metric threshold 310 may be associated with a path that is slowly changing (e.g., path 205, channel) (e.g., and therefore may benefit less from additional DMRS). Therefore, UE 115-a and network entity 105-a may configure one or more DMRS symbols 360 of a subsequent resource block to be associated with fewer or zero DMRS ports 305 that meet the delay metric threshold 310. For example, the UE may determine that DMRS ports 305-a and 305-b are associated with delay metrics that meet the delay metric threshold 310, and that DMRS ports 305-c and 305-d are associated with delay metrics that do not meet the delay metric threshold 310. Therefore, DMRS ports 305-a and 305-b can be associated with slower-changing paths, and fewer DMRS symbols of subsequent resource blocks can be associated with DMRS ports 305-a and 305-b.

[0109] Resource block 355 may be a subsequent resource block 355, in which one or more DMRS symbols are associated with fewer DMRS ports 305 based on a latency metric associated with DMRS port 305. For example, DMRS ports 305-a and 305-b may correspond to the UE's third port 375 and fourth port 380. The UE and network entities may configure each DMRS symbol 360 to carry a subset of ports for its DMRS. In one case, DMRS symbol 360-a may carry DMRS for the first port 365, the second port 370, the third port 375, and the fourth port 380. However, DMRS symbols 360-b and 360-c may not correspond to DMRS ports 305-a and 305-b based on a latency metric that satisfies latency metric threshold 310 associated with DMRS ports 305-a (e.g., the third port 375) and 305-b (e.g., the fourth port 380). Therefore, resource block 355 can have more resources for other transmissions.

[0110] Additionally or alternatively, the UE and network entities may configure one or more DMRS symbols 360 of resource block 355 to not carry DMRS. For example, based on a latency metric associated with, for instance, each DMRS port 305 of the UE satisfying a latency metric threshold 310, DMRS symbol 360-d may not carry any DMRS for the UE's DMRS port 305. Although resource block 355 includes four DMRS symbols 360, the techniques described herein can be applied to resource block 355 having any number of DMRS symbols 360.

[0111] In some cases, to allow for adaptive (e.g., dynamic) configuration of DMRS, a UE (e.g., UE 115-a) may communicate control signaling (e.g., preconditions) to a network entity (e.g., network entity 105-a). For example, the UE may indicate to the network entity the DMRS ports 305 supported by each DMRS symbol 360. In some cases, DMRS symbol 360-a (e.g., the first-time DMRS symbol of resource block 355, the preceding DMRS symbol) may carry DMRS for the same number of DMRS ports 305 associated with the communication channel used for DMRS. Additionally or alternatively, fewer DMRS ports 305 may be associated with DMRS symbols 360-b, 360-c, and 360-d (e.g., additional DMRS symbols) based on a latency metric associated with a DMRS port 305 (e.g., or the path corresponding to a DMRS port 305).

[0112] In some cases, a network entity may indicate to the UE the number of DMRS ports 305 associated with each DMRS symbol 360. For example, the network entity may indicate to the UE a DMRS mode (e.g., a DMRS port mode) that indicates a set of quantities corresponding to the number of DMRS ports 305 associated with each DMRS symbol 360. For example, the network entity may send one or more DCI messages to the UE indicating the DMRS mode for resource block 355. In the case illustrated in resource block diagram 350, the DMRS mode may be [4, 2, 2, 0], which means that DMRS symbol 360-a (e.g., a first-time DMRS symbol) corresponds to four DMRS ports, DMRS symbols 360-b and 360-c (e.g., a second-time DMRS symbol and a third-time DMRS symbol, respectively) each correspond to two DMRS ports, and DMRS symbol 360-d (e.g., a fourth-time DMRS symbol) corresponds to zero DMRS ports. Additionally (e.g., in the case of MU-MIMO), the DMRS mode can indicate one or more DMRS CDM groups associated with each DMRS port of the UE, so that the UE can know the resource (e.g., code resource) allocation for each DMRS symbol 360.

[0113] Additionally or alternatively, the DMRS ports 305 associated with the UE (e.g., UE 115-a) may form port groups, wherein each port group includes one or more DMRS ports among the DMRS ports 305. In some cases, the DMRS mode may indicate the number of DMRS ports 305 on a per-port basis (e.g., as described above) or on a per-port group basis (e.g., port configuration). For example, in a wireless communication system including multiple transmit-receive points (TRPs), each TRP may transmit DMRS associated with different corresponding DMRS ports 305 to the UE. The UE may measure (e.g., detect, determine) one or more delay metrics (e.g., Doppler shift, path delay, or both) associated with each corresponding DMRS port 305 and may report one or more delay metrics to network entities. As an illustrative example, a first port group (e.g., port group 1) may include the UE's first port 365 and second port 370, and a second port group (e.g., port group 2) may include the UE's third port 375 and fourth port 380. Each port group may correspond to a corresponding TRP, and (e.g., based on reports from the UE) the network entity may indicate to the UE the DMRS mode (e.g., adaptive DMRS port configuration) for each port group. For example, the DMRS mode for the first port group (e.g., in the case of resource block diagram 350) may be [2, 2, 2, 0], and the DMRS mode for the second port group may be [2, 0, 0, 0].

[0114] As described herein, the number of ports associated with each DMRS symbol (e.g., the number of ports receiving DMRS in each symbol) may vary among the DMRS symbols 360 within resource block 355. For example, a port pattern may indicate the number of ports associated with each DMRS symbol 360 of resource block 355. Although resource block diagram 350 includes four DMRS symbols 360, the techniques described herein can be applied to any number (e.g., 1, 2, 3, 4, 5, 6) of DMRS symbols 360 within a resource block.

[0115] In some cases, the UE, network entity, or both may determine the DMRS mode (e.g., including the number of ports associated with each DMRS symbol) based on one or more delay metrics associated with each DMRS port, as determined by the UE (e.g., measured, detected). For example, the UE may report to the network entity the Doppler shift associated with each DMRS port, the path delay associated with each DMRS port, or both (e.g., the channel change rate), and the network entity may determine the DMRS mode based on the corresponding Doppler shift, path delay, or both (e.g., including the channel change rate). Additionally or alternatively, the UE may determine the DMRS mode based on one or more delay metrics and may indicate the DMRS mode to the network entity (e.g., a requested DMRS mode, a desired DMRS mode).

[0116] In some cases, a network entity, a UE, or both may determine the DMRS mode based on a lookup table. For example, a network entity, a UE, or both may store (e.g., maintain) a lookup table that associates latency metrics associated with each DMRS port of the UE with a DMRS mode (e.g., per port or per group of ports, as described herein). Additionally or alternatively, the UE may receive RRC signaling indicating the lookup table. As an example, the UE may measure one or more latency metrics associated with each DMRS port 305 and may determine the DMRS mode from the lookup table based on one or more latency metrics of one or more DMRS ports in DMRS ports 305. Additionally or alternatively, the UE may send one or more latency metrics to a network entity, and the network entity may determine the DMRS mode from the lookup table based on one or more latency metrics of one or more DMRS ports in DMRS ports 305.

[0117] In some cases, the UE, network entity, or both may configure one or more DMRS symbols in resource block 355 of DMRS symbols 360 to not contain any DMRS (e.g., not associated with any DMRS port). For example, (e.g., in the case of repeated DMRS symbols 360), if the delay metric (e.g., Doppler shift, path delay) associated with one or more DMRS ports 305 is below a delay metric threshold 310, the DMRS mode may not allocate any DMRS port 305 to one or more DMRS symbols in DMRS symbols 360 (e.g., DMRS symbol 360-d). Additionally or alternatively, the DMRS mode may not allocate any DMRS port to resource block 355 (e.g., Figure 3(In a scenario not shown), resource block 355 may not have a DMRS symbol 360 to carry DMRS, or may not have a DMRS symbol 360 to be configured for resource block 355. This DMRS mode (e.g., empty DMRS mode, blank DMRS mode) reduces the use of transmission resources for DMRS in resource block 355.

[0118] Additionally, the UE, network entity, or both may implicitly indicate such a DMRS mode (e.g., an empty DMRS mode) via a predetermined (e.g., pre-configured, configured) DMRS sequence in the previous resource block 355. For example, the UE, network entity, or both may indicate a DMRS mode known to the other of the UE and network entity, and this DMRS mode may indicate that a subsequent resource block may not contain any DMRS symbol 360, or that no DMRS port 305 may be allocated for the DMRS symbol 360 of the subsequent resource block. Additionally or alternatively, the network entity may transmit DMRS in the previous resource block 355 according to a sequence (e.g., frequency, bit sequence, MCS) that indicates to the UE that a subsequent resource block may not contain DMRS symbol 360, or that the DMRS symbol 360 of the subsequent resource block may not be associated with DMRS port 305.

[0119] Figure 10 An example of a process flow 1000 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown. In some cases, aspects of process flow 400 may be implemented. Figure 1 – Figure 3 These aspects, or can be implemented by these aspects. For example, process flow 400 may include network entity 105-b and UE 115-b, which may be as described herein with respect to... Figure 1 – Figure 3 Examples of network entity 105 and UE 115 described. In some respects, UE 115-b can communicate with network entity 105-b to adaptively configure DMRS communication.

[0120] In the following description of process flow 400, operations may be performed in a different order than those shown, or other operations may be added to or removed from process flow 400. For example, some operations may be omitted from process flow 400, some operations may be performed in a different order or at different times, or other operations may be added to process flow 400. Although UE 115-b and network entity 105-b are shown as performing operations of process flow 400, some aspects of some operations may also be performed by one or more other wireless devices or network devices.

[0121] At 405, UE 115-b may communicate control information with network entity 105-b. For example, UE 115-b may indicate capability information to network entity 105-b. The capability information may indicate the ability of UE 115-b and network entity 105-b to perform adaptive configuration of DMRS. Additionally or alternatively, network entity 105-b may send control information to UE 115-b to indicate one or more resources for UE 115-b to send (e.g., and for network entity 105-b to receive) indications of delay metrics (e.g., Doppler shift, path delay) associated with the DMRS port of UE 115-b. In some cases, control information may additionally or alternatively include signaling at the Radio Resource Control (RRC), Media Access Control (MAC), or Physical (PHY) layer to semi-statically configure or dynamically trigger the UE 115-b to send indications of delay metrics associated with DMRS ports and adaptively update DMRS symbols and / or ports, as described herein.

[0122] At 410, UE 115-b can monitor the first group of OFDM symbols to locate the first group of DMRS. In some cases, each OFDM symbol in the first group of OFDM symbols may be associated with a set of DMRS ports (e.g., the same set of DMRS ports), as described in this document. Figure 2 and Figure 3 As described. In some cases, the set of DMRS ports may include one or more port groups, where each port group may include one or more DMRS ports from that set of DMRS ports. In some cases, the first set of OFDM symbols may be pre-configured to UE 115-b by network entity 105-b or indicated via control signaling (e.g., via downlink control information (DCI), MAC control element (MAC-CE), or RRC layer signaling).

[0123] At 415, network entity 105-b may output (e.g., transmit) a first set of DMRSs via a first set of OFDM symbols. In some cases, each DMRS output by network entity 105-b may be associated with a UE's DMRS port. For example, in each OFDM symbol of the first set of OFDM symbols, network entity 105-b may output four DMRSs corresponding to four corresponding DMRS ports of UE 115-b. Additionally or alternatively, each DMRS output by network entity 105-b may be propagated from network entity 105-b to UE 115-b via a corresponding path (e.g., based on the beam configuration of each DMRS, the code configuration of each DMRS, the physical environment between network entity 105-b and UE 115-b, and other factors), which may make the DMRS a multipath signal. UE 115-b may receive the DMRS via the corresponding path and the corresponding DMRS port, and may map the DMRS associated with each corresponding path (e.g., each DMRS associated with each path) to a DMRS port. In some cases, the UE may receive and map DMRS based on one or more sensors of the UE 115-b (e.g., lidar, camera, radar).

[0124] At 420, UE 115-b can measure (e.g., determine, detect) one or more delay metrics associated with the first set of DMRSs (e.g., a corresponding delay metric associated with each corresponding DMRS). For example, one or more delay metrics may include one or more path delays, one or more Doppler shifts, or both. In some cases, UE 115-b can map each DMRS in the first set of DMRSs to a port in that set of DMRS ports, as referenced herein. Figure 3 As described.

[0125] At 425, UE 115-b can communicate DMRS port configuration information to network entity 105-b. For example, UE 115-b can send indications for one or more latency metrics associated with a first set of DMRS, wherein each of the one or more latency metrics may correspond to a DMRS port in that set of DMRS ports (e.g., based on a mapping). For example, sending indications for one or more latency metrics may be based on a mapping.

[0126] Additionally or alternatively, UE 115-b may communicate information associated with DMRS modes (e.g., dynamic DMRS port configuration, adaptive DMRS port configuration) to network entity 105-b. In some cases, the DMRS mode may indicate a subset of DMRS ports associated with one or more DMRS symbols for receiving DMRS from network entity 105-b, as referenced herein. Figure 3As described. For example, a subset of the set of DMRS ports may include one or more DMRS ports in the set of DMRS ports based on one or more delay metric thresholds. For example, a subset of the set of DMRS ports may include one or more DMRS ports in the set of DMRS ports corresponding to a corresponding path delay in one or more path delays that meets a path delay threshold or a corresponding Doppler shift in one or more Doppler shifts that meets a Doppler shift threshold.

[0127] For example, UE 115-b may select one or more DMRS ports from the set of DMRS ports that correspond to a path delay that satisfies a path delay threshold among one or more path delays or a Doppler shift that satisfies a Doppler shift threshold among one or more Doppler shifts as a subset of the set of DMRS ports. Additionally or alternatively, the subset may include at least one port group from one or more port groups of the set of DMRS ports.

[0128] In some cases, UE 115-b and network entity 105-b may communicate a DMRS mode that indicates one or more DMRS port numbers associated with one or more OFDM symbols in the second set of OFDM symbols. In some cases, network entity 105-b may obtain the DMRS port numbers from other network entities. UE 115-b may receive the indication of the DMRS mode at least in part based on one or more path delays or one or more Doppler shifts, wherein the DMRS mode indicates a subset of the set of DMRS ports. Additionally or alternatively, the DMRS mode may indicate the CDM group of each DMRS in the second set of DMRS associated with the second set of OFDM symbols.

[0129] Network entity 105-b or UE 115-b may identify a second set of OFDM symbols and a subset of that set of DMRS ports from a lookup table based on one or more path delays or one or more Doppler shifts. For example, UE 115-b, network entity 105-b, or both may store (e.g., maintain) the lookup table in memory associated with network entity 105-b or UE 115-b, respectively. In some cases, UE 115-b may receive an indication of the lookup table from network entity 105-b (bound to control information at 405). For example, UE 115-b may receive an indication of the lookup table from network entity 105-b in control information at 405.

[0130] At 430, UE 115-b can monitor a second set of OFDM symbols to locate a second set of DMRS. The OFDM symbols in the second set of OFDM symbols can be associated with at least a subset of the DMRS ports in that set, based on one or more path delays or one or more Doppler shifts. In some cases, monitoring of the second set of OFDM symbols can be based on one or more DMRS port numbers, which can be indicated by a DMRS mode.

[0131] At 435, network entity 105-b may output (e.g., transmit) a second set of DMRS via the second set of OFDM symbols. UE 115-b may receive the second set of DMRS according to one or more indicated DMRS numbers, which may be indicated by a DMRS mode. In some other cases, network entity 105-b may not output any DMRS during the second set of OFDM symbols based on an empty DMRS mode, as described herein. Figure 3 As described. For example, if one or more delay metrics associated with one or more DMRS ports of UE 115-b meet a delay metric threshold, the DMRS mode can be an empty DMRS mode. Therefore, UE 115-b and network entity 105-b can reduce the use of wireless communication resources for DMRS based on the measured delay metrics.

[0132] Figure 11 A block diagram 1100 of a device 1105 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown. Device 1105 may be an example of aspects of UE 115 as described herein. Device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. Device 1105, or one or more components of device 1105 (e.g., receiver 1110, transmitter 1115, and communication manager 1120), may include at least one processor that can be coupled to at least one memory to individually or jointly support or implement the described technologies. Each of these components may communicate with each other (e.g., via one or more buses).

[0133] Receiver 1110 may provide components for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to adaptive configuration of DMRS). The information may be passed to other components of device 1105. Receiver 1110 may utilize a single antenna or a collection of antennas.

[0134] Transmitter 1115 may provide components for transmitting signals generated by other components of device 1105. For example, transmitter 1115 may transmit information associated with various information channels (e.g., control channels, data channels, information channels related to adaptive configuration of DMRS), such as packets, user data, control information, or any combination thereof. In some examples, transmitter 1115 may be co-located with receiver 1110 in a transceiver module. Transmitter 1115 may utilize a single antenna or a collection of multiple antennas.

[0135] The communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof, or various components thereof, may be examples of components for performing various aspects of adaptive configuration of the DMRS as described herein. For example, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof, or components thereof, may be able to perform one or more of the functions described herein.

[0136] In some examples, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include at least one of the following: a processor, digital signal processor (DSP), central processing unit (CPU), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, microcontroller, discrete gate or transistor logic component, discrete hardware component, or any combination thereof, configured as or otherwise individually or collectively to support components for performing the functions described herein. In some examples, at least one processor and at least one memory coupled to said at least one processor may be configured to perform one or more of the functions described herein (e.g., instructions stored in at least one memory are executed individually or collectively by one or more processors).

[0137] Additionally or alternatively, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be implemented in code executed by at least one processor (e.g., as communication management software or firmware). If implemented in code executed by at least one processor, the functionality of the communication manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise individually or jointly to support components for performing the functions described in this disclosure).

[0138] In some examples, the communication manager 1120 may be configured to use a receiver 1110, a transmitter 1115, or both, or otherwise cooperate with them to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 1120 may receive information from the receiver 1110, transmit information to the transmitter 1115, or integrate with the receiver 1110, the transmitter 1115, or both to acquire information, output information, or perform various other operations as described herein.

[0139] Communication manager 1120 may support wireless communication according to examples disclosed herein. For example, communication manager 1120 may be capable of, configured to, or operable to support components for monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. Communication manager 1120 may be capable of, configured to, or operable to support components for transmitting indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. Communication manager 1120 may be capable of, configured to, or operable to support components for monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0140] By including or configuring a communication manager 1120 according to an example as described herein, device 1105 (e.g., controlling receiver 1110, transmitter 1115, communication manager 1120, or a combination thereof, or at least one processor otherwise coupled to them) can support techniques for more efficient use of communication resources. For example, a UE implementing the techniques described herein can use fewer communication resources to transmit DMRS symbols.

[0141] Figure 12 A block diagram 1200 of a device 1205 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown. Device 1205 may be an example of aspects of device 1105 or UE 115 as described herein. Device 1205 may include receiver 1210, transmitter 1215, and communication manager 1220. Device 1205, or one or more components of device 1205 (e.g., receiver 1210, transmitter 1215, and communication manager 1220), may include at least one processor that can be coupled to at least one memory to support the described technology. Each of these components may communicate with each other (e.g., via one or more buses).

[0142] Receiver 1210 may provide components for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to adaptive configuration of DMRS). The information may be passed to other components of device 1205. Receiver 1210 may utilize a single antenna or a collection of antennas.

[0143] Transmitter 1215 may provide components for transmitting signals generated by other components of device 1205. For example, transmitter 1215 may transmit information associated with various information channels (e.g., control channels, data channels, information channels related to adaptive configuration of DMRS), such as packets, user data, control information, or any combination thereof. In some examples, transmitter 1215 may be co-located with receiver 1210 in a transceiver module. Transmitter 1215 may utilize a single antenna or a collection of multiple antennas.

[0144] Device 1205 or its various components may be examples of various aspects of a component used to perform adaptive configuration of DMRS as described herein. For example, communication manager 1220 may include OFDM monitoring component 1225, DMRS measurement communication component 1230, or any combination thereof. Communication manager 1220 may be examples of aspects of communication manager 1120 as described herein. In some examples, communication manager 1220 or its various components may be configured to use receiver 1210, transmitter 1215, or both, or otherwise cooperate with them to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, communication manager 1220 may receive information from receiver 1210, transmit information to transmitter 1215, or be integrated in combination with receiver 1210, transmitter 1215, or both to acquire information, output information, or perform various other operations as described herein.

[0145] Communication manager 1220 can support wireless communication according to examples disclosed herein. OFDM monitoring component 1225 is capable of, configured to, or operable to support components for monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. DMRS measurement communication component 1230 is capable of, configured to, or operable to support components for transmitting indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. OFDM monitoring component 1225 is capable of, configured to, or operable to support components for monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0146] Figure 13 A block diagram 1300 of a communication manager 1320 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure is shown. The communication manager 1320 may be an example of a communication manager 1120, a communication manager 1220, or aspects thereof as described herein. The communication manager 1320 or its various components may be examples of components for performing various aspects of adaptive configuration of DMRS as described herein. For example, the communication manager 1320 may include an OFDM monitoring component 1325, a DMRS metric communication component 1330, a DMRS port selection component 1335, a DMRS mode component 1340, a lookup table component 1345, a DMRS metric measurement component 1350, a DMRS mapping component 1355, or any combination thereof. Each of these components, or its components or sub-components (e.g., one or more processors, one or more memories), may communicate directly or indirectly with each other (e.g., via one or more buses).

[0147] Communication manager 1320 can support wireless communication according to examples disclosed herein. OFDM monitoring component 1325 is capable of, configured to, or operable to support components for monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. DMRS measurement communication component 1330 is capable of, configured to, or operable to support components for transmitting indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. In some examples, OFDM monitoring component 1325 is capable of, configured to, or operable to support components for monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0148] In some examples, the DMRS port selection component 1335 is capable of, can be configured to, or is operable to support the selection of one or more DMRS ports from the set of DMRS ports that correspond to a path delay that satisfies a path delay threshold in one or more path delays or a Doppler shift that satisfies a Doppler shift threshold in one or more Doppler shifts as a subset of the set of DMRS ports.

[0149] In some examples, in order to support the transmission of indications of one or more path delays or one or more Doppler shifts, the DMRS measurement communication component 1330 is capable of, can be configured to, or can operate to support components for transmitting one or more DMRS port numbers associated with one or more OFDM symbols in a second set of OFDM symbols, wherein monitoring of the second set of OFDM symbols is performed based on the one or more DMRS port numbers.

[0150] In some examples, the DMRS mode component 1340 is capable of, configured to, or operable to support components for receiving indications of a DMRS mode based on one or more path delays or one or more Doppler shifts, wherein monitoring of a second set of OFDM symbols is performed according to the DMRS mode.

[0151] In some examples, the DMRS mode indicates a subset of the set of DMRS ports.

[0152] In some examples, the DMRS mode indicates the code division multiplexing (CDM) group of each DMRS in the second group of DMRS.

[0153] In some examples, the set of DMRS ports includes one or more port groups, and the subset includes at least one of the one or more port groups.

[0154] In some examples, the lookup table component 1345 is capable of, can be configured to, or is operable to support components for identifying a second set of OFDM symbols and a subset of that set of DMRS ports from the lookup table based on one or more path delays or one or more Doppler shifts.

[0155] In some examples, the lookup table component 1345 is capable of, can be configured to, or is operable to support components for receiving instructions on the lookup table.

[0156] In some examples, the DMRS measurement component 1350 is capable of, configured to, or operable to support components for measuring one or more path delays or one or more Doppler shifts of a first set of DMRSs. In some examples, the DMRS mapping component 1355 is capable of, configured to, or operable to support components for mapping each DMRS in the first set of DMRSs to a port in a set of DMRS ports, wherein indications of one or more path delays or one or more Doppler shifts are sent based on this mapping.

[0157] Figure 14 A diagram of a system 1400 including a device 1405 with adaptive configuration supporting DMRS, according to one or more aspects of this disclosure, is shown. Device 1405 may be an example of device 1105, device 1205, or UE 115 as described herein, or may include components thereof. Device 1405 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof (e.g., wirelessly). Device 1405 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1420, an input / output (I / O) controller 1410, a transceiver 1415, an antenna 1425, at least one memory 1430, code 1435, and at least one processor 1440. These components may communicate electronically or otherwise (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1445).

[0158] I / O controller 1410 manages the input and output signals of device 1405. I / O controller 1410 can also manage peripheral devices not integrated into device 1405. In some cases, I / O controller 1410 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1410 may utilize an operating system such as iOS. ® ANDROID® MS-DOS ® MS-WINDOWS ® OS / 2 ® UNIX ® LINUX ® Alternatively, the I / O controller 1410 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1410 may be implemented as part of one or more processors, such as at least one processor 1440. In some cases, a user may interact with the device 1405 via the I / O controller 1410 or via hardware components controlled by the I / O controller 1410.

[0159] In some cases, device 1405 may include a single antenna 1425. However, in other cases, device 1405 may have more than one antenna 1425, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. Transceiver 1415 may communicate bidirectionally via one or more antennas 1425 as described herein, a wired or wireless link. For example, transceiver 1415 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 1415 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 1425 for transmission; and demodulating packets received from one or more antennas 1425. Transceiver 1415, or transceiver 1415 and one or more antennas 1425, may be an example of transmitter 1115, transmitter 1215, receiver 1110, receiver 1210, or any combination thereof or components thereof as described herein.

[0160] At least one memory 1430 may include random access memory (RAM) and read-only memory (ROM). At least one memory 1430 may store computer-readable, computer-executable code 1435, including instructions that, when executed by at least one processor 1440, cause device 1405 to perform the various functions described herein. Code 1435 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 1435 may not be directly executable by at least one processor 1440, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, among other things, at least one memory 1430 may also include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0161] At least one processor 1440 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, at least one processor 1440 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into at least one processor 1440. At least one processor 1440 may be configured to execute computer-readable instructions stored in memory (e.g., at least one memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks supporting adaptive configuration of DMRS). For example, device 1405 or components of device 1405 may include at least one processor 1440 and at least one memory 1430 coupled to or coupled to at least one processor 1440, wherein at least one processor 1440 and at least one memory 1430 are configured to perform the various functions described herein. In some examples, at least one processor 1440 may include multiple processors, and at least one memory 1430 may include multiple memories. One or more of a plurality of processors may be coupled to one or more of a plurality of memories, which may be configured individually or collectively to perform the various functions described herein. In some examples, at least one processor 1440 may be a component of a processing system, which may refer to a machine (such as a series of machines), circuitry (including, for example, one or both of processor circuitry (which may include at least one processor 1440) and memory circuitry (which may include at least one memory 1430)) or component that receives or receives input and processes the input to produce, generate or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. Thus, at least one processor 1440 or a processing system including at least one processor 1440 may be configured, configured to, or operable to cause device 1405 to perform one or more of the functions described herein. Furthermore, as described herein, “configured to,” “configurable to,” and “operable to” are used interchangeably and may be associated with the ability to perform one or more of the functions described herein when executing code stored in at least one memory 1430 or otherwise.

[0162] Communication manager 1420 may support wireless communication according to examples disclosed herein. For example, communication manager 1420 may be capable of, configured to, or operable to support components for monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. Communication manager 1420 may be capable of, configured to, or operable to support components for transmitting indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. Communication manager 1420 may be capable of, configured to, or operable to support components for monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0163] By including or configuring a communication manager 1420 according to an example as described herein, device 1405 can support techniques for more efficient use of communication resources. For example, a UE implementing the techniques described herein can use fewer communication resources to convey DMRS symbols.

[0164] In some examples, the communication manager 1420 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using a transceiver 1415, one or more antennas 1425, or any combination thereof, or otherwise cooperating with them. Although the communication manager 1420 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1420 may be supported or executed by at least one processor 1440, at least one memory 1430, code 1435, or any combination thereof. For example, code 1435 may include instructions that can be executed by at least one processor 1440 to cause device 1405 to perform various aspects of the adaptive configuration of the DMRS as described herein, or at least one processor 1440 and at least one memory 1430 may be otherwise configured to perform or support such operations individually or jointly.

[0165] Figure 15 illustrates a block diagram 1500 of a device 1505 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure. Device 1505 may be an example of aspects of network entity 105 as described herein. Device 1505 may include a receiver 1510, a transmitter 1515, and a communication manager 1520. Device 1505, or one or more components of device 1505 (e.g., receiver 1510, transmitter 1515, and communication manager 1520), may include at least one processor that can be coupled to at least one memory to individually or jointly support or implement the described technologies. Each of these components may communicate with each other (e.g., via one or more buses).

[0166] Receiver 1510 may provide components for acquiring (e.g., receiving, determining, identifying) information (such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units)) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). The information may be passed to other components of device 1505. In some examples, receiver 1510 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 1510 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0167] Transmitter 1515 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 1505. For example, transmitter 1515 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, transmitter 1515 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 1515 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, transmitter 1515 and receiver 1510 may be co-located in a transceiver, which may include or be coupled to a modem.

[0168] The communication manager 1520, receiver 1510, transmitter 1515, or various combinations thereof, or various components thereof, may be examples of components for performing various aspects of adaptive configuration of the DMRS as described herein. For example, the communication manager 1520, receiver 1510, transmitter 1515, or various combinations thereof, or components thereof, may be able to perform one or more of the functions described herein.

[0169] In some examples, the communication manager 1520, receiver 1510, transmitter 1515, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include at least one of a processor, DSP, CPU, ASIC, FPGA, or other programmable logic device, microcontroller, discrete gate or transistor logic unit, discrete hardware component, or any combination thereof, configured as or otherwise individually or collectively to support components for performing the functions described herein. In some examples, at least one processor and at least one memory coupled to said at least one processor may be configured to perform one or more of the functions described herein (e.g., instructions stored in at least one memory are executed individually or collectively by one or more processors).

[0170] Additionally or alternatively, the communication manager 1520, receiver 1510, transmitter 1515, or various combinations or components thereof may be implemented in code (e.g., as communication management software or firmware) executed by at least one processor. If implemented in code executed by at least one processor, the functionality of the communication manager 1520, receiver 1510, transmitter 1515, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise individually or jointly to support components for performing the functions described in this disclosure).

[0171] In some examples, the communication manager 1520 may be configured to use a receiver 1510, a transmitter 1515, or both, or otherwise cooperate with them to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 1520 may receive information from the receiver 1510, transmit information to the transmitter 1515, or be integrated in combination with the receiver 1510, the transmitter 1515, or both to acquire information, output information, or perform various other operations as described herein.

[0172] Communication manager 1520 may support wireless communication according to examples disclosed herein. For example, communication manager 1520 may be capable of, configured to, or operable to support components for outputting a first set of DMRS via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. Communication manager 1520 may be capable of, configured to, or operable to support components for obtaining indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. Communication manager 1520 may be capable of, configured to, or operable to support components for outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0173] By including or configuring a communication manager 1520 according to an example as described herein, device 1505 (e.g., controlling receiver 1510, transmitter 1515, communication manager 1520, or a combination thereof, or at least one processor otherwise coupled to them) can support techniques for more efficient use of communication resources. For example, a network entity implementing the techniques described herein can use fewer communication resources to transmit DMRS symbols.

[0174] Figure 16 illustrates a block diagram 1600 of a device 1605 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure. Device 1605 may be an example of aspects of device 1505 or network entity 105 as described herein. Device 1605 may include a receiver 1610, a transmitter 1615, and a communication manager 1620. Device 1605, or one or more components of device 1605 (e.g., receiver 1610, transmitter 1615, and communication manager 1620), may include at least one processor that can be coupled to at least one memory to support the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0175] Receiver 1610 may provide components for acquiring (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 passed to other components of device 1605. In some examples, receiver 1610 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 1610 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0176] Transmitter 1615 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 1605. For example, transmitter 1615 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, transmitter 1615 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 1615 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, transmitter 1615 and receiver 1610 may be co-located in a transceiver, which may include or be coupled to a modem.

[0177] Device 1605 or its various components may be examples of various aspects of a component used to perform adaptive configuration of DMRS as described herein. For example, communication manager 1620 may include DMRS communication component 1625, DMRS measurement communication component 1630, or any combination thereof. Communication manager 1620 may be examples of aspects of communication manager 1520 as described herein. In some examples, communication manager 1620 or its various components may be configured to use receiver 1610, transmitter 1615, or both, or otherwise cooperate with them to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, communication manager 1620 may receive information from receiver 1610, transmit information to transmitter 1615, or integrate in combination with receiver 1610, transmitter 1615, or both to acquire information, output information, or perform various other operations as described herein.

[0178] Communication manager 1620 can support wireless communication according to examples disclosed herein. DMRS communication component 1625 is capable of, configured to, or operable to support components for outputting a first set of DMRS via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. DMRS measurement communication component 1630 is capable of, configured to, or operable to support components for obtaining indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. DMRS communication component 1625 is capable of, configured to, or operable to support components for outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0179] Figure 17 illustrates a block diagram 1700 of a communication manager 1720 supporting adaptive configuration of DMRS according to one or more aspects of this disclosure. The communication manager 1720 may be an example of a communication manager 1520, a communication manager 1620, or aspects thereof as described herein. The communication manager 1720 or its various components may be examples of parts for performing various aspects of adaptive configuration of DMRS as described herein. For example, the communication manager 1720 may include a DMRS communication component 1725, a DMRS metric communication component 1730, a DMRS mode component 1735, a lookup table component 1740, or any combination thereof. These components, or each of their components or sub-components (e.g., one or more processors, one or more memories), may communicate directly or indirectly with each other (e.g., via one or more buses), and this communication may include communication within protocol layers of a protocol stack, communication associated with logical channels of the protocol stack (e.g., between protocol layers of the protocol stack, within devices, components, or virtualization components associated with network entity 105, between devices, components, or virtualization components associated with network entity 105), or any combination thereof.

[0180] Communication manager 1720 can support wireless communication according to examples disclosed herein. DMRS communication component 1725 is capable of, configured to, or operable to support components for outputting a first set of DMRS via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. DMRS measurement communication component 1730 is capable of, configured to, or operable to support components for obtaining indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. In some examples, DMRS communication component 1725 is capable of, configured to, or operable to support components for outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0181] In some examples, the subset of the set of DMRS ports includes one or more DMRS ports that correspond to a path delay that satisfies a path delay threshold in one or more path delays or a Doppler shift that satisfies a Doppler shift threshold in one or more Doppler shifts.

[0182] In some examples, in order to support receiving indications of one or more path delays or one or more Doppler shifts, the DMRS measurement communication component 1730 is capable of, configured to, or able to operate to support components for obtaining one or more DMRS port numbers associated with one or more OFDM symbols in a second set of OFDM symbols, wherein the transmission of the second set of DMRS via the second set of OFDM symbols is based on the one or more DMRS port numbers.

[0183] In some examples, the DMRS mode component 1735 is capable of, can be configured to, or is operable to support components for outputting indications of DMRS modes based on one or more path delays or one or more Doppler shifts, wherein the output of a second set of DMRS is performed according to the DMRS mode.

[0184] In some examples, the DMRS mode indicates a subset of the set of DMRS ports.

[0185] In some examples, the DMRS mode indicates the code division multiplexing (CDM) group of each DMRS in the second group of DMRS.

[0186] In some examples, the set of DMRS ports includes one or more port groups, and the subset includes at least one of the one or more port groups.

[0187] In some examples, the lookup table component 1740 is capable of being configured or operated to support components for identifying a second set of OFDM symbols and a subset of that set of DMRS ports from the lookup table based on one or more path delays or one or more Doppler shifts.

[0188] In some examples, the lookup table component 1740 is capable of, can be configured to, or is operable to support components for outputting instructions for the lookup table.

[0189] Figure 18 illustrates a system 1800 including a device 1805 with DMRS-enabled adaptive configuration according to one or more aspects of this disclosure. Device 1805 may be an example of device 1505, device 1605, or network entity 105 as described herein, or may include components thereof. Device 1805 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, and this communication may include communication via one or more wired interfaces, one or more wireless interfaces, or any combination thereof. Device 1805 may include components that support output and enable communication, such as a communication manager 1820, a transceiver 1810, an antenna 1815, at least one memory 1825, code 1830, and at least one processor 1835. These components may communicate electronically or otherwise (e.g., operatively, communicatively, functionally, electronically, or electrically) via one or more buses (e.g., bus 1840).

[0190] Transceiver 1810 may support bidirectional communication via a wired link, a wireless link, or both, as described herein. In some examples, transceiver 1810 may include a wired transceiver and be capable of bidirectional communication with another wired transceiver. Additionally or alternatively, in some examples, transceiver 1810 may include a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. In some examples, device 1805 may include one or more antennas 1815 that are capable of (e.g., concurrently) transmitting or receiving wireless transmissions. Transceiver 1810 may also include a modem for: modulating a signal; providing the modulated signal for transmission (e.g., by one or more antennas 1815, by a wired transmitter); receiving the modulated signal (e.g., from one or more antennas 1815, from a wired receiver); and demodulating the signal. In some embodiments, transceiver 1810 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 1815 configured to support various receive or acquire operations, or one or more interfaces coupled to one or more antennas 1815 configured to support various transmit or output operations, or combinations thereof. In some embodiments, transceiver 1810 may include one or more processors or one or more memory components, or be configured to couple to such processors or memory components, which are operable to perform or support operations based on received or acquired information or signals, or generate information or other signals for transmission or other output, or any combination thereof. In some embodiments, transceiver 1810, or transceiver 1810 and one or more antennas 1815, or transceiver 1810 and one or more antennas 1815, and one or more processors or one or more memory components (e.g., at least one processor 1835, at least one memory 1825, or both), may be included in a chip or chip assembly mounted in device 1805. In some examples, transceiver 1810 may be able to operate 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).

[0191] At least one memory 1825 may include RAM, ROM, or any combination thereof. At least one memory 1825 may store computer-readable, computer-executable code 1830 including instructions that, when executed by one or more processors of at least one processor 1835, cause device 1805 to perform the various functions described herein. Code 1830 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 1830 may not be directly executable by a processor of at least one processor 1835, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, at least one memory 1825 may also include a BIOS, among other things, which controls basic hardware or software operations, such as interaction with peripheral components or devices. In some examples, at least one processor 1835 may include multiple processors, and at least one memory 1825 may include multiple memories. One or more of the multiple processors may be coupled to one or more of the multiple memories, which may be configured individually or collectively to perform the various functions described herein (e.g., as part of a processing system).

[0192] At least one processor 1835 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, ASICs, CPUs, FPGAs, microcontrollers, programmable logic devices, discrete gate or transistor logic units, discrete hardware components, or any combination thereof). In some cases, at least one processor 1835 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into one or more processors in at least one processor 1835. At least one processor 1835 may be configured to execute computer-readable instructions stored in memory (e.g., one or more of at least one memory 1825) to cause device 1805 to perform various functions (e.g., functions or tasks supporting adaptive configuration of DMRS). For example, device 1805 or components of device 1805 may include at least one processor 1835 and at least one memory 1825 coupled to one or more of the at least one processor 1835, wherein at least one processor 1835 and at least one memory 1825 are configured to perform the various functions described herein. At least one processor 1835 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, virtual machine, or container instance) that can (e.g., by executing code 1830) host functions for performing the functions of device 1805. At least one processor 1835 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 1805 (such as within one or more of at least one memory 1825). In some examples, at least one processor 1835 may include multiple processors, and at least one memory 1825 may include multiple memories. One or more of the multiple processors may be coupled to one or more of the multiple memories, which may be configured individually or collectively to perform the various functions described herein. In some examples, at least one processor 1835 may be a component of a processing system, which can refer to a system of machines (such as a series of machines), circuits (including, for example, one or both of processor circuitry (which may include at least one processor 1835) and memory circuitry (which may include at least one memory 1825)) or components that receive or receive input and process the input to produce, generate, or obtain a set of outputs. The processing system can be configured to perform one or more of the functions described herein. Therefore, at least one processor 1835 or a processing system including at least one processor 1835 can be configured, configured to, or operated to cause the device 1805 to perform one or more of the functions described herein.Furthermore, as described herein, “configured to,” “capable of being configured to,” and “capable of operating to” are used interchangeably and may be associated with the ability to perform one or more of the functions described herein when executing code stored in at least one memory 1825 or otherwise.

[0193] In some examples, bus 1840 may support communication at the protocol layer of the protocol stack (e.g., within a protocol layer). In some examples, bus 1840 may support communication associated with logical channels of the protocol stack (e.g., between protocol layers of the protocol stack), which may include communication performed within components of device 1805, or communication performed between different components of device 1805 that are co-addressable or may be located in different locations (e.g., where device 1805 may refer to a system in which one or more of communication manager 1820, transceiver 1810, at least one memory 1825, code 1830 and at least one processor 1835 may be located in one component of different components or partitioned between different components).

[0194] In some examples, the communication manager 1820 can manage (e.g., via one or more wired or wireless backhaul links) various aspects of communication with the core network 130. For example, the communication manager 1820 can manage the transfer of data communication with client devices, such as one or more UEs 115. In some examples, the communication manager 1820 can manage communication with other network entities 105 and may include a controller or scheduler for cooperating with other network entities 105 to control communication with UE 115. In some examples, the communication manager 1820 may support the X2 interface within LTE / LTE-A wireless communication network technology to provide communication between network entities 105.

[0195] The communication manager 1820 can support wireless communication according to examples disclosed herein. For example, the communication manager 1820 is capable of, configured to, or operable to support components for outputting a first set of DMRS via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. The communication manager 1820 is capable of, configured to, or operable to support components for obtaining indications of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. The communication manager 1820 is capable of, configured to, or operable to support components for outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of that set of DMRS ports based on one or more path delays or one or more Doppler shifts.

[0196] By including or configuring a communication manager 1820 according to an example as described herein, device 1805 can support techniques for more efficient use of communication resources. For example, a network entity implementing the techniques described herein can use fewer communication resources to convey DMRS symbols.

[0197] In some examples, the communication manager 1820 may be configured to use or otherwise coordinate with the transceiver 1810, one or more antennas 1815 (e.g., where applicable), or any combination thereof to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). Although the communication manager 1820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1820 may be supported or performed by the transceiver 1810, one or more processors in at least one processor 1835, one or more memories in at least one memory 1825, code 1830, or any combination thereof (e.g., by a processing system including at least a portion of at least one processor 1835, at least one memory 1825, code 1830, or any combination thereof). For example, code 1830 may include instructions that can be executed by one or more of the at least one processor 1835 to cause the device 1805 to perform various aspects of the adaptive configuration of the DMRS as described herein, or at least one processor 1835 and at least one memory 1825 may be otherwise configured to perform or support such operations individually or jointly.

[0198] Figure 19 shows a flowchart illustrating a method 1900 for adaptive configuration supporting DMRS according to various aspects of this disclosure. Operation of method 1900 can be implemented by a UE or its components as described herein. For example, operation of method 1900 can be implemented by, as referenced... Figures 7 to 14 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0199] At 1905, the method may include monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. The operation of box 1905 may be performed according to the examples disclosed herein, such as... Figure 4 UE 115-b monitors to look for DRMS ​​from network entity 105-b, and / or UE 115-a monitors to look for DMRS from Figure 2 Network entity 105-a receives DMRS. In some examples, aspects of the operation of 1905 can be determined by reference to [reference needed]. Figure 13 The OFDM monitoring component 1325 described herein is used to perform this function.

[0200] At 1910, the method may include sending an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. Operation of block 1910 may be performed according to examples as disclosed herein, such as... Figure 4 UE 115-b sends DMRS port configuration information to network entity 105-b at 425, and / or Figure 2 UE 115-a sends an indication of latency measurement to network entity 105-a. In some examples, aspects of 1910's operation can be determined by reference to... Figure 13 The DMRS metric communication component 1330 is described to perform this.

[0201] At 1915, the method may include monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of ports of that set of DMRS based on one or more path delays or one or more Doppler shifts. The operation of box 1915 may be performed according to examples as disclosed herein, such as... Figure 4 UE115-b monitoring to look for a second set of DRMS ​​from network entity 105-b, and / or Figure 3 Resource block 355 includes DMRS symbols 360 associated with a subset of DMRS ports 305. In some examples, aspects of the operation of 1915 may be determined by reference to [reference needed]. Figure 13 The OFDM monitoring component 1325 described herein is used to perform this function.

[0202] Figure 20 shows a flowchart illustrating a method 2000 for adaptive configuration supporting DMRS according to various aspects of this disclosure. The operation of method 2000 can be implemented by a network entity or its components as described herein. For example, the operation of method 2000 can be implemented by, as referenced... Figures 7 to 10 And the network entities described in Figures 15 through 18 are used to perform this function. In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the described function. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the described function.

[0203] At 2005, the method may include outputting a first set of DMRSs via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports. The operation of block 2005 may be performed according to examples as disclosed herein, such as... Figure 4Network entity 105-b sends DRMS ​​to UE 115-b, and / or Figure 2 Network entity 105-a sends DMRS to UE 115-a. In some examples, aspects of the operation of 2005 may be performed by DMRS communication component 1725 as described with reference to Figure 17.

[0204] At 2010, the method may include obtaining an indication of one or more path delays or one or more Doppler shifts associated with a first set of DMRSs, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in that set of DMRS ports. Operation of block 2010 may be performed according to examples as disclosed herein, such as... Figure 4 UE 115-b sends DMRS port configuration information to network entity 105-b at 425, and / or Figure 2 UE 115-a sends an indication of latency measurement to network entity 105-a. In some examples, aspects of 2010's operation can be performed by DMRS measurement communication component 1730 as described with reference to Figure 17.

[0205] At 2015, the method may include outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with a subset of the DMRS ports based on one or more path delays or one or more Doppler shifts. The operation of box 2015 may be performed according to examples as disclosed herein, such as... Figure 4 Network entity 105-b sends a second set of DRMS ​​to UE 115-b, and / or Figure 3 Resource block 355 includes DMRS symbols 360 associated with a subset of DMRS port 305. In some examples, aspects of the operation of 2015 may be performed by DMRS communication component 1725 as described with reference to Figure 17.

[0206] The following provides an overview of the various aspects of this disclosure: Aspect 1: A method for wireless communication at a UE, the method comprising: monitoring a first set of OFDM symbols to locate a first set of DMRS, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; transmitting an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and monitoring a second set of OFDM symbols to locate a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with at least in part a subset of the set of DMRS ports based on the one or more path delays or the one or more Doppler shifts.

[0207] Aspect 2: According to the method of aspect 1, the method further includes: selecting one or more DMRS ports from the set of DMRS ports that correspond to the corresponding path delay in the one or more path delays that satisfies a path delay threshold or the corresponding Doppler frequency shift in the one or more Doppler frequency shifts that satisfies a Doppler frequency shift threshold as the subset of the set of DMRS ports.

[0208] Aspect 3: The method according to any one of Aspects 1 to 2, wherein sending the indication of the one or more path delays or the one or more Doppler shifts comprises: sending one or more DMRS port numbers associated with one or more OFDM symbols in the second group of OFDM symbols, wherein monitoring of the second group of OFDM symbols is performed based on the one or more DMRS port numbers.

[0209] Aspect 4: The method according to any one of aspects 1 to 3, the method further comprising: receiving an indication of a DMRS mode at least in part based on the one or more path delays or the one or more Doppler shifts, wherein monitoring of the second set of OFDM symbols is performed according to the DMRS mode.

[0210] Aspect 5: According to the method of aspect 4, wherein the DMRS mode indicates the subset of the set of DMRS ports.

[0211] Aspect 6: The method according to any one of Aspects 4 to 5, wherein the DMRS mode indicates the CDM group of each DMRS in the second group of DMRS.

[0212] Aspect 7: The method according to any one of Aspects 1 to 6, wherein the set of DMRS ports comprises one or more port groups, and the subset comprises at least one of the one or more port groups.

[0213] Aspect 8: The method according to any one of Aspects 1 to 7, the method further comprising: identifying the second set of OFDM symbols and the subset of the set of DMRS ports from a lookup table at least in part based on the one or more path delays or the one or more Doppler shifts.

[0214] Aspect 9: According to the method of aspect 8, the method further includes: receiving an instruction for the lookup table.

[0215] Aspect 10: The method according to any one of Aspects 1 to 9, the method further comprising: measuring the one or more path delays or the one or more Doppler shifts of the first group of DMRSs; and mapping each of the first group of DMRSs to a port in the group of DMRS ports, wherein the indication of the one or more path delays or the one or more Doppler shifts is transmitted at least in part based on the mapping.

[0216] Aspect 11: A method for wireless communication at a network entity, the method comprising: outputting a first set of DMRS via a first set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols being associated with a set of DMRS ports; obtaining an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; and outputting a second set of DMRS via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with at least a subset of the set of DMRS ports based on the one or more path delays or the one or more Doppler shifts.

[0217] Aspect 12: According to the method of aspect 11, the subset of the set of DMRS ports includes one or more DMRS ports in the set of DMRS ports corresponding to a corresponding path delay that satisfies a path delay threshold or a corresponding Doppler shift that satisfies a Doppler shift threshold among the one or more Doppler shifts.

[0218] Aspect 13: The method according to any one of Aspects 11 to 12, wherein receiving the indication of the one or more path delays or the one or more Doppler shifts comprises: obtaining one or more DMRS port numbers associated with one or more OFDM symbols in the second set of OFDM symbols, wherein the transmission of the second set of DMRS via the second set of OFDM symbols is performed based on the one or more DMRS port numbers.

[0219] Aspect 14: The method according to any one of aspects 11 to 13, the method further comprising: outputting an indication of a DMRS mode at least in part based on the one or more path delays or the one or more Doppler frequency shifts, wherein the output of the second set of DMRS is performed according to the DMRS mode.

[0220] Aspect 15: The method according to aspect 14, wherein the DMRS mode indicates the subset of the set of DMRS ports.

[0221] Aspect 16: The method according to any one of Aspects 14 to 15, wherein the DMRS mode indicates the CDM group of each DMRS in the second group of DMRS.

[0222] Aspect 17: The method according to any one of Aspects 11 to 16, wherein the set of DMRS ports comprises one or more port groups, and the subset comprises at least one of the one or more port groups.

[0223] Aspect 18: The method according to any one of aspects 11 to 17, the method further comprising: identifying the second set of OFDM symbols and the subset of the set of DMRS ports from a lookup table at least in part based on the one or more path delays or the one or more Doppler shifts.

[0224] Aspect 19: The method according to aspect 18 further includes: outputting an indication of the lookup table.

[0225] Aspect 20: An apparatus for wireless communication at a UE (e.g., a UE), the apparatus comprising one or more processors, one or more memories coupled to the one or more processors, and one or more processor-readable instructions stored in the one or more memories and executable individually or jointly by the one or more processors to cause the apparatus to perform the method according to any one of aspects 1 to 10.

[0226] Aspect 21: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to any one of aspects 1 to 10.

[0227] Aspect 22: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by one or more processors to perform the method according to any one of aspects 1 to 10.

[0228] Aspect 23: An apparatus for wireless communication at a network entity (e.g., a network entity), the apparatus comprising: one or more processors, one or more memories coupled to the one or more processors, and one or more processor-readable instructions stored in the one or more memories and executable individually or jointly by the one or more processors to cause the apparatus to perform a method according to any one of aspects 11 to 19.

[0229] Aspect 24: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to any one of aspects 11 to 19.

[0230] Aspect 25: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by one or more processors to perform the method according to any one of aspects 11 to 19.

[0231] It should be noted that the methods described herein describe possible specific implementations, and the operations and steps can be rearranged or otherwise modified, and other specific implementations are also possible. Furthermore, aspects from two or more of these methods can be combined.

[0232] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein are also applicable to networks outside of LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described are applicable to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0233] The information and signals described herein can be represented using any of a variety of different techniques and skills. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0234] The various exemplary blocks and components described herein can be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic unit, discrete hardware component, or any combination thereof, designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in alternative embodiments, a processor may be any processor, controller, microcontroller, or state machine. A 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 cooperating with a DSP core, or any other such configuration). Any function or operation described herein that can be performed by a processor may be performed by multiple processors capable of performing the described functions or operations individually or jointly.

[0235] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. When implemented using software executed by a processor, the functions can be stored as one or more instructions or code on a computer-readable medium or transmitted using one or more instructions or code on 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 can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features implementing the functions can also be physically located in various locations, including various portions distributed such that the functions are implemented in different physical locations.

[0236] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transitory storage media can be any available medium accessible by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code components in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs. Disks can magnetically reproduce data, and optical discs can optically reproduce data using lasers. Combinations of the above are also included within the scope of computer-readable media. Any function or operation described herein that can be performed by memory can be performed by multiple memories capable of performing the described function or operation individually or jointly.

[0237] As used herein, the word "or" in a list of items (e.g., a list of items accompanied by phrases such as "at least one of" or "one or more of") in the claims indicates an inclusive list, such that a list of at least one of, for example, 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). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0238] As used herein, including in claims, the article “a” preceding a noun is open-ended and is understood to refer to “at least one” or “one or more” of those nouns. Therefore, the terms “a,” “at least one,” “one or more,” and “at least one of one or more” are interchangeable. For example, where a claim enumerates “components” performing one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “component” having a characteristic or performing a function may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent references to a component introduced with the article “a” using the terms “the” or “the” can refer to any or all of the one or more components. For example, a component introduced with the article “a” can be understood to mean “one or more components,” and subsequent reference to “the component” in a claim can be understood as equivalent to referring to “at least one of the one or more components.” Similarly, subsequent references to a component introduced with the terms “the” or “the” as “one or more components” can refer to any or all of the one or more components. For example, reference to "the one or more components" in the subsequent claims can be understood as equivalent to reference to "at least one of the one or more components".

[0239] The term "determine" encompasses a variety of actions, and therefore, "determine" can include calculation, computation, processing, derivation, investigation, lookup (such as by searching in a table, database, or other data structure), identification, and similar actions. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data stored in memory), etc. Moreover, "determine" can include parsing, obtaining, selecting, choosing, building, and other similar actions.

[0240] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by adding a dash after the reference numeral and a second reference numeral to differentiate them. If only the first reference numeral is used in the description, the description can be applied to any of the similar components having the same first reference numeral, regardless of the second or other subsequent reference numerals.

[0241] The description herein, illustrated with reference to the accompanying drawings, describes an example configuration and does not represent all implementable or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "advantageous over other examples." The detailed description includes specific details used to provide an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concept of the described examples.

[0242] The description herein is provided to enable those skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Therefore, this 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. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: One or more processors; One or more memories, said one or more memories being coupled to said one or more processors; and One or more processor-readable instructions, stored in the one or more memories and executable individually or jointly by the one or more processors, to cause the device to: The first group of orthogonal frequency division multiplexing (OFDM) symbols is monitored to find the first group of demodulation reference signals (DMRS), each OFDM symbol in the first group of OFDM symbols is associated with a set of DMRS ports; Send an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; as well as Monitor a second set of OFDM symbols to find a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with at least a subset of the set of DMRS ports based on the one or more path delays or the one or more Doppler shifts.

2. The UE of claim 1, wherein the instructions are further executable by the one or more processors individually or jointly to cause the device to: One or more DMRS ports from the set of DMRS ports are selected as the subset of the set of DMRS ports, corresponding to the path delay that satisfies the path delay threshold among the one or more path delays or the Doppler shift that satisfies the Doppler shift threshold among the one or more Doppler shifts.

3. The UE according to claim 1, wherein, In order to send the indication of the one or more path delays or the one or more Doppler shifts, the instructions can be executed individually or jointly by the one or more processors to cause the device to: Send one or more DMRS port numbers associated with one or more OFDM symbols in the second group of OFDM symbols, wherein monitoring of the second group of OFDM symbols is performed based on the one or more DMRS port numbers.

4. The UE of claim 1, wherein the instructions are further executable by the one or more processors individually or jointly to cause the device to: Receive an indication of a DMRS mode based at least in part on the one or more path delays or the one or more Doppler shifts, wherein monitoring of the second set of OFDM symbols is performed according to the DMRS mode.

5. The UE of claim 4, wherein the DMRS mode indicates the subset of the set of DMRS ports.

6. The UE of claim 4, wherein the DMRS mode indicates a code division multiplexing (CDM) group for each DMRS in the second group of DMRSs.

7. The UE of claim 1, wherein the set of DMRS ports comprises one or more port groups, and the subset comprises at least one of the one or more port groups.

8. The UE of claim 1, wherein the instructions are further executable by the one or more processors individually or jointly to cause the device to: The subset of the second set of OFDM symbols and the set of DMRS ports are identified from the lookup table at least in part based on the one or more path delays or the one or more Doppler shifts.

9. The UE of claim 8, wherein the instructions are further executable by the one or more processors individually or jointly to cause the device to: Receive an instruction for the lookup table.

10. The UE of claim 1, wherein the instructions are further executable by the one or more processors individually or jointly to cause the device to: Measuring the path delay or the Doppler shift of the first set of DMRS; and Each DMRS in the first set of DMRSs is mapped to a port in the set of DMRS ports, wherein the indication of the one or more path delays or the one or more Doppler shifts is transmitted at least in part based on the mapping.

11. An apparatus for wireless communication at a network entity, the apparatus comprising: One or more processors; One or more memories, said one or more memories being coupled to said one or more processors; and One or more processor-readable instructions, stored in the one or more memories and executable individually or jointly by the one or more processors, to cause the device to: The first set of demodulation reference signals (DMRS) is output via the first set of orthogonal frequency division multiplexing (OFDM) symbols, and each OFDM symbol in the first set of OFDM symbols is associated with a set of DMRS ports; Obtain an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; as well as A second set of DMRS is output via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with at least a subset of the set of DMRS ports based on the one or more path delays or the one or more Doppler shifts.

12. The network entity of claim 11, wherein the subset of the set of DMRS ports includes one or more DMRS ports that correspond to a path delay that satisfies a path delay threshold or a Doppler shift that satisfies a Doppler shift threshold among the one or more Doppler shifts.

13. The network entity according to claim 11, wherein, In order to receive the indication of the one or more path delays or the one or more Doppler shifts, the instructions can be executed individually or jointly by the one or more processors to cause the device to: Obtain one or more DMRS port numbers associated with one or more OFDM symbols in the second group of OFDM symbols, wherein the transmission of the second group of DMRS via the second group of OFDM symbols is performed based on the one or more DMRS port numbers.

14. The network entity of claim 11, wherein the instructions are further capable of being executed individually or jointly by the one or more processors to cause the device to: The output indicates a DMRS mode based at least in part on the one or more path delays or the one or more Doppler shifts, wherein the output of the second set of DMRS is based on the DMRS mode.

15. The network entity of claim 14, wherein the DMRS mode indicates the subset of the set of DMRS ports.

16. The network entity of claim 14, wherein the DMRS mode indicates a code division multiplexing (CDM) group for each DMRS in the second set of DMRSs.

17. The network entity of claim 11, wherein the set of DMRS ports comprises one or more port groups, and the subset comprises at least one of the one or more port groups.

18. The network entity of claim 11, wherein the instructions are further capable of being executed individually or jointly by the one or more processors to cause the device to: The subset of the second set of OFDM symbols and the set of DMRS ports are identified from the lookup table at least in part based on the one or more path delays or the one or more Doppler shifts.

19. The network entity of claim 18, wherein the instructions are further capable of being executed individually or jointly by the one or more processors to cause the device to: Output an instruction for the lookup table.

20. A method for conducting wireless communication at a user equipment (UE), the method comprising: The first group of orthogonal frequency division multiplexing (OFDM) symbols is monitored to find the first group of demodulation reference signals (DMRS), each OFDM symbol in the first group of OFDM symbols is associated with a set of DMRS ports; Send an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; as well as Monitor a second set of OFDM symbols to find a second set of DMRS, wherein the OFDM symbols in the second set of OFDM symbols are associated with at least a subset of the set of DMRS ports based on the one or more path delays or the one or more Doppler shifts.

21. The method according to claim 20, further comprising: One or more DMRS ports from the set of DMRS ports are selected as the subset of the set of DMRS ports, corresponding to the path delay that satisfies the path delay threshold among the one or more path delays or the Doppler shift that satisfies the Doppler shift threshold among the one or more Doppler shifts.

22. The method of claim 20, wherein sending the indication of the one or more path delays or the one or more Doppler shifts comprises: Send one or more DMRS port numbers associated with one or more OFDM symbols in the second group of OFDM symbols, wherein monitoring of the second group of OFDM symbols is performed based on the one or more DMRS port numbers.

23. The method according to claim 20, further comprising: Receive an indication of a DMRS mode based at least in part on the one or more path delays or the one or more Doppler shifts, wherein monitoring of the second set of OFDM symbols is performed according to the DMRS mode.

24. The method of claim 23, wherein the DMRS mode indicates the subset of the set of DMRS ports.

25. The method of claim 23, wherein the DMRS mode indicates a code division multiplexing (CDM) group for each DMRS in the second set of DMRSs.

26. The method of claim 20, wherein the set of DMRS ports comprises one or more port groups, and the subset comprises at least one of the one or more port groups.

27. The method of claim 20, further comprising: The subset of the second set of OFDM symbols and the set of DMRS ports are identified from the lookup table at least in part based on the one or more path delays or the one or more Doppler shifts.

28. The method of claim 27, further comprising: Receive an instruction for the lookup table.

29. The method according to claim 20, further comprising: Measure the path delay or the Doppler shift of the first set of DMRS; as well as Each DMRS in the first set of DMRSs is mapped to a port in the set of DMRS ports, wherein the indication of the one or more path delays or the one or more Doppler shifts is transmitted at least in part based on the mapping.

30. A method for conducting wireless communication at a network entity, the method comprising: The first set of demodulation reference signals (DMRS) is output via the first set of orthogonal frequency division multiplexing (OFDM) symbols, and each OFDM symbol in the first set of OFDM symbols is associated with a set of DMRS ports; Obtain an indication of one or more path delays or one or more Doppler shifts associated with the first set of DMRS, each of the one or more path delays or each of the one or more Doppler shifts corresponding to a DMRS port in the set of DMRS ports; as well as A second set of DMRS is output via a second set of OFDM symbols, wherein the OFDM symbols in the second set of OFDM symbols are associated with at least a subset of the set of DMRS ports based on the one or more path delays or the one or more Doppler shifts.

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