Quasi co-location type for doppler pre-compensated reference signals

Abstract

Methods, systems, and devices are described for wireless communication. A base station, which can include at least two transmission reception points (TRPs) adjacent to a high speed train (HST), can transmit, to a user equipment (UE) on the HST, an indication of a quasi co-location (QCL) relationship, the indication indicating a relationship between a plurality of tracking reference signals (TRSs) and a demodulation reference signal (DMRS) of a data channel. The plurality of TRSs can include a first TRS and a second TRS. The UE can receive, from a first TRP, the first TRS associated with a time occasion of the data channel and receive, from a second TRP, the second TRS associated with the time occasion of the data channel. The UE can perform, based on the indication of the QCL relationship, a channel estimation procedure for the data channel based on the DMRS, the received first TRS, and the received second TRS.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of Greek provisional patent application No. 20200100140, filed on March 13, 2020, entitled “QUASI CO-LOCATION TYPE FOR DOPPLER PRE-COMPENSATED REFERENCE SIGNAL”, which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to wireless communications, and more particularly to a quasi-coexistence (QCL) type for Doppler-precompensated reference signals.

[0004] background

[0005] 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), LTE-A Advanced (LTE-A), or LTE-A Pro systems) and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ various technologies, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication with multiple communication devices, which may also be referred to as User Equipment (UE).

[0006] In some scenarios, dedicated wireless networks may be deployed along transportation platforms (e.g., lanes, runways, railways) to serve UEs transported at high speeds (e.g., UEs transported on high-speed trains (HST)). In some implementations, HST channel propagation may impose uniqueness challenges, such as high Doppler variations (e.g., Doppler shift, Doppler spread, sparse Doppler distribution), high mobility constraints, degraded channel estimation, etc.

[0007] Overview

[0008] The described techniques relate to improved methods, systems, apparatuses, and devices supporting quasi-coexistence (QCL) types for Doppler-compensated reference signals. Generally, the described techniques facilitate enhanced communication between one or more transmit-receive points (TRPs) along a transport platform (e.g., a roadway, runway, railway) and user equipment (UE) on a high-speed transport vehicle (e.g., a car, airplane, train) (e.g., a high-speed train (HST)). In some implementations, the described techniques support consideration of reference signals (such as demodulation reference signals (DMRS) and tracking reference signals (TRS)) and QCL relationships (e.g., assumptions), including but not limited to those for HST single-frequency networks (SFNs) (HST-SFN). For example, a base station comprising at least two TRPs that may be uniformly separated along an HST may transmit an indication to the UE of a QCL relationship indicating the relationship between multiple TRSs and the DMRS of a data channel. The multiple TRSs may include at least a first TRS and a second TRS. The UE can receive the first TRS associated with the timing of the data channel from the first TRP, and the second TRS associated with the timing of the data channel from the second TRP. The UE can perform a channel estimation procedure for the data channel based on the DMRS, the received first TRS, and the received second TRS, based on the indication of the QCL relationship.

[0009] In another example, the base station may transmit to the UE on the HST an indication that the base station can perform pre-compensation for each reference signal (e.g., TRS) from each TRP. In some cases, the pre-compensation may include Doppler shift pre-compensation, or Doppler spread pre-compensation, or a combination thereof for the first TRP and the second TRP. The UE may receive the indication and receive a first TRS associated with the timing of the data channel from the first TRP, and a second TRS associated with the timing of the data channel from the second TRP, wherein these TRS may be pre-compensated. The UE may perform a channel estimation procedure for the data channel based on the received indication, the received first TRS, and the received second TRS.

[0010] A method for wireless communication at a UE is described. The method may include: receiving from a base station an indication of a QCL relationship, the indication specifying a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; receiving from a first TRP the first TRS associated with the timing of the data channel; receiving from a second TRP the second TRS associated with the timing of the data channel; and performing a channel estimation procedure for the data channel based on the indication of the QCL relationship, the DMRS, the received first TRS, and the received second TRS.

[0011] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are processor-executable to cause the apparatus to: receive from a base station an indication of a QCL relationship, the indication specifying a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; receive from a first TRP the first TRS associated with the timing of the data channel, and from a second TRP the second TRS associated with the timing of the data channel; and, based on the indication of the QCL relationship, perform a channel estimation procedure for the data channel based on the DMRS, the received first TRS, and the received second TRS.

[0012] Another apparatus for wireless communication at a UE is described. The apparatus may include: means for receiving from a base station an indication of a QCL relationship, the indication indicating a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; means for receiving from a first TRP the first TRS associated with the timing of the data channel; means for receiving from a second TRP the second TRS associated with the timing of the data channel; and means for performing a channel estimation procedure for the data channel based on the indication of the QCL relationship, the DMRS, the received first TRS, and the received second TRS.

[0013] A non-transient computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive from a base station an indication of a QCL relationship, the indication specifying a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; receive from a first TRP the first TRS associated with the timing of the data channel; receive from a second TRP the second TRS associated with the timing of the data channel; and perform a channel estimation procedure for the data channel based on the indication of the QCL relationship, the DMRS, the received first TRS, and the received second TRS.

[0014] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the timing of the data channel can be used for SFN transmission of the data channel, the SFN transmission including the DMRS from the first TRP and the second TRP.

[0015] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indication of the QCL relationship includes an indication of whether the set having multiple TRSs can be pre-compensated by the base station.

[0016] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indicated pre-compensation for the set having multiple TRS includes Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first TRP and the second TRP.

[0017] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, receiving an indication of the QCL relationship may include operations, features, means, or instructions for receiving the indication in a TRS configuration that at least indicates a first resource set for the first TRS and a second resource set for the second TRS.

[0018] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indication in the TRS configuration includes an information element indicating whether the set having multiple TRSs can be pre-compensated by the base station.

[0019] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indication of the QCL relationship includes a field indicating whether the set having multiple TRSs can be pre-compensated by the base station.

[0020] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: determining a first Doppler frequency shift value or a first Doppler spread value or both associated with the first TRP based on the received first TRS; determining a second Doppler frequency shift value or a second Doppler spread value or both associated with the second TRP based on the received second TRS; and transmitting to the base station a report indicating the first Doppler frequency shift value and the second Doppler frequency shift value, or the first Doppler spread value and the second Doppler spread value, or both.

[0021] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the QCL relationship includes an indication that the Doppler frequency shift between the DMRS and the set having a plurality of TRSs is within a first threshold, or the QCL relationship includes an indication that the Doppler spread between the DMRS and the set having a plurality of TRSs is within a second threshold, or both.

[0022] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the QCL relationship further includes the Doppler frequency shift, the Doppler spread, the average delay, and the delay spread.

[0023] Examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for receiving the DMRS and data signals at that time in the data channel and for decoding the received data signals based on the execution of the channel estimation procedure.

[0024] Examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for determining a Doppler shift value, or a Doppler spread value, or both, between a received first TRS and a received second TRS, and for reporting the determined Doppler shift value, or Doppler spread value, or both, to the base station.

[0025] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for identifying that a determined Doppler frequency shift value exceeds a first threshold, or a determined Doppler spread value exceeds a second threshold, or both, wherein the determined Doppler frequency shift value may be reported to the base station at least in part based on the determined Doppler frequency shift value exceeding the first threshold, or the determined Doppler spread value may be reported to the base station at least in part based on the determined Doppler spread value exceeding the second threshold, or both.

[0026] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first TRP and the second TRP may be associated with a layer of the data channel, and the DMRS of the data channel includes a DMRS port.

[0027] A method for wireless communication at a base station is described. The method may include: transmitting to a UE an indication of a QCL relationship, the indication specifying a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; transmitting the first TRS and the DMRS of the data channel from a first TRP of the base station; and transmitting the second TRS and the DMRS of the data channel from a second TRP of the base station.

[0028] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: transmit to a UE an indication of a QCL relationship, the indication specifying a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; transmit the first TRS and the DMRS of the data channel from a first TRP of the base station; and transmit the second TRS and the DMRS of the data channel from a second TRP of the base station.

[0029] Another apparatus for wireless communication at a base station is described. The apparatus may include: means for transmitting to a UE an indication of a QCL relationship, the indication indicating a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; means for transmitting the first TRS and the DMRS of the data channel from a first TRP of the base station; and means for transmitting the second TRS and the DMRS of the data channel from a second TRP of the base station.

[0030] A non-transient computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to perform the following operations: transmitting to a UE an indication of a QCL relationship, the indication specifying a relationship between a set of multiple TRSs and a DMRS of a data channel, the set of multiple TRSs including at least a first TRS and a second TRS; transmitting the first TRS and the DMRS of the data channel from a first TRP of the base station; and transmitting the second TRS and the DMRS of the data channel from a second TRP of the base station.

[0031] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the DMRS can be transmitted from the first TRP and the second TRP as SFN transmission.

[0032] Examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for transmitting data signals as SFN transmissions from the first TRP and the second TRP at opportune moments in the data channel.

[0033] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indication of the QCL relationship includes an indication of whether the set having multiple TRSs can be pre-compensated by the base station.

[0034] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indicated pre-compensation for the set having multiple TRS includes Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first TRP and the second TRP.

[0035] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, transmitting an indication of the QCL relationship may include operations, features, means, or instructions for transmitting the indication in a TRS configuration that at least indicates a first resource set for the first TRS and a second resource set for the second TRS.

[0036] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for receiving from the UE a report indicating a Doppler shift value or a Doppler spread value, or both, between the first TRS and the second TRS.

[0037] Examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for transmitting to the UE a configuration for the UE to receive the set having multiple TRSs from a set of multiple TRPs including at least the first TRP and the second TRP.

[0038] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first TRP and the second TRP may be associated with a single layer of the data channel, and the DMRS of the data channel includes a DMRS port. Brief description of the attached diagram

[0040] Figure 1 Examples of systems for supporting quasi-coexistence (QCL) type wireless communication for a Doppler-precompensated reference signal are explained according to various aspects of this disclosure.

[0041] Figure 2 Examples of systems for supporting QCL-type wireless communication for a Doppler-precompensated reference signal, according to various aspects of this disclosure, are explained.

[0042] Figure 3 An example of a QCL-type Doppler precompensation procedure for a Doppler-precompensated reference signal, supported by various aspects of this disclosure, is explained.

[0043] Figure 4 An example of a QCL-type process flow supported by various aspects of this disclosure for a Doppler-precompensated reference signal is explained.

[0044] Figure 5 and 6 A block diagram of a QCL-type device supporting a Doppler-precompensated reference signal is shown, according to various aspects of this disclosure.

[0045] Figure 7 A block diagram is shown that supports a QCL-type communication manager for a Doppler-precompensated reference signal according to various aspects of this disclosure.

[0046] Figure 8 A diagram is shown of a system including a QCL-type device for supporting a Doppler-precompensated reference signal, according to various aspects of this disclosure.

[0047] Figure 9 and 10 A block diagram of a QCL-type device supporting a Doppler-precompensated reference signal is shown, according to various aspects of this disclosure.

[0048] Figure 11 A block diagram is shown that supports a QCL-type communication manager for a Doppler-precompensated reference signal according to various aspects of this disclosure.

[0049] Figure 12 A diagram is shown of a system including a QCL-type device for supporting a Doppler-precompensated reference signal, according to various aspects of this disclosure.

[0050] Figures 13 to 16 A flowchart illustrating a method for a QCL-type reference signal supported by various aspects of this disclosure is shown.

[0051] Detailed description

[0052] Some wireless communication systems (such as fifth-generation (5G) systems, which may be referred to as new radio (NR) systems) can be configured to support communication on high-speed transportation vehicles (e.g., high-speed trains (HSTs)). For example, user equipment (UEs) on an HST can be configured to receive communication from one or more transmit receiving points (TRPs) along the railway, where TRPs may be evenly or similarly spaced along the track. In some cases, the UE and TRPs may communicate via a single-frequency network (SFN) (e.g., a broadcast network) such that each TRP can simultaneously transmit the same signal to the UE on the same frequency channel.

[0053] A UE on an HST can travel between two TRPs, and these TRPs can transmit a joint SFN reference signal to the UE so that the UE can estimate aspects of the radio channel between the TRPs and the UE based on the measured reference signal. In some implementations, the UE can use the Quasi-Coexistence (QCL) assumption to perform channel estimation. For example, QCL allows the radio device to make assumptions or determinations about the relationships between different radio channels associated with different downlink transmissions received at different antenna ports. The radio device can use QCL assumptions between two or more antenna ports to perform channel estimation for those antenna ports. This helps the radio device determine which reference signals should be used for channel estimation for different downlink transmissions or to determine the relevant Channel State Information (CSI), and other operations. Thus, the UE can receive the same reference signal from multiple TRPs and use the QCL assumption to determine downlink channel (e.g., Physical Downlink Shared Channel (PDSCH)) conditions (e.g., Channel Quality Indicator (CQI), Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Noise Ratio (SINR), Rank Indicator (RI)).

[0054] SFN reference signal transmissions from multiple TRPs can cause the UE to receive echoes of the same reference signal, which can interfere with each other, adversely affecting channel estimation. To mitigate reference signal interference, TRPs can be configured to receive multiple QCL assumptions about a single UE demodulation reference signal (DMRS) port, such that each TRP along the HST can transmit different reference signals to the UE, where these reference signals are transmitted on different DMRS ports and according to different Transmission Configuration Indicator (TCI) states. A UE receiving two different reference signals can estimate channel conditions (e.g., PDSCH conditions) more accurately because the different reference signals do not interfere with each other. In some cases, the UE may receive a first reference signal from a first TRP and a second reference signal from a second TRP. The UE may determine that the two received reference signals have two different Doppler variations (such as Doppler shift, Doppler spread, delay, etc.), which may increase the complexity of the UE's determination of channel conditions.

[0055] To reduce the complexity of channel estimation and improve efficiency at the UE, the first TRP and the second TRP can be individually Doppler pre-compensated for the first and second reference signals to account for the different Doppler variations between the two reference signals. Individual Doppler pre-compensation allows the UE to more accurately determine channel conditions and estimate Doppler shift and / or spread for future communication with the first and second TRPs. Doppler pre-compensation improves the UE's ability to assess appropriate frequency offsets for downlink channel estimation at the DMRS port.

[0056] In some implementations, the first TRP and the second TRP may indicate whether pre-compensation has been configured to the UE via higher-layer signaling before the pre-compensated reference signal is transmitted to the UE. In some cases, the UE may receive the pre-compensated reference signal from both TRPs and estimate the Doppler shift and / or spread experienced between each TRP. The UE may feed back the Doppler shift and / or spread estimate to each TRP, and each TRP may use the Doppler shift and / or spread estimate to further improve the Doppler pre-compensation.

[0057] Specific aspects of the subject matter described herein can be implemented to achieve one or more advantages. The described techniques support improvements in networks with multiple TRPs (including SFN networks (e.g., HST-SFN networks)) by mitigating interference between reference signals and improving channel estimation, among other advantages. Thus, the supported techniques can include improved network operation, and in some examples, enhanced network efficiency, and other benefits.

[0058] The aspects of this disclosure are initially described in the context of wireless communication systems. Subsequently, aspects concerning Doppler pre-compensation procedures and process flow are described. The aspects of this disclosure are further explained and described by way of apparatus diagrams, system diagrams, and flowcharts relating to the type of QCL used for the Doppler-pre-compensated reference signal.

[0059] Figure 1 Examples of a QCL-type wireless communication system 100 supporting a Doppler-precompensated reference signal, according to various aspects of this disclosure, are described. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0060] Base station 105 can be distributed across a geographical area to form wireless communication system 100, and can be different types of devices or devices with different capabilities. Base station 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area over which base station 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0061] Each UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. Each UE 115 can be a different type of device or a device with different capabilities. Figure 1 The document describes some example UE 115s. The UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network equipment (e.g., core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment). Figure 1 As shown in the image.

[0062] Each base station 105 may communicate with the core network 130, or with each other, or both. For example, base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other directly (e.g., directly between base stations 105), indirectly (e.g., via the core network 130), or directly and indirectly on backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 may be or include one or more radio links.

[0063] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, B node, evolved B node (eNB), next-generation B node or gigabit B node (any of which may be referred to as gNB), home B node, home evolved B node, or other suitable terms.

[0064] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a unit, 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, which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0065] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, as well as base station 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 As shown in the image.

[0066] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources 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 radio 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 may support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0067] The signal waveform transmitted on the 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 include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the code rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and using multiple spatial layers can further improve the data rate or data integrity of communication with the UE 115.

[0068] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period T. s =1 / (Δf) max ·N f ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, while N fThis can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources 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 (e.g., ranging from 0 to 1023).

[0069] 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 several 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 several symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N) symbols. f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier interval or the operating frequency band.

[0070] A subframe, time slot, mini-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 bursts of shortened TTIs (sTTIs)).

[0071] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more UEs 115 can monitor or search control regions for 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 cascaded manner. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set configured to send control information to a particular UE 115.

[0072] In some examples, base station 105 may be mobile, and thus provide communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage to various geographic coverage areas 110.

[0073] 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) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services, such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData)). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general business applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0074] In some examples, UE 115 may also be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or may be unable to receive transmissions from base station 105 for other reasons. In some examples, groups of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the individual UE 115s without involving base station 105.

[0075] 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). The EPC or 5GC 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 base station 105 associated with core network 130. User IP packets can be delivered through the user plane entity, which provides IP address allocation and other functions. The user plane entity can connect to network operator IP service 150. Carrier IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0076] Some network devices (such as base station 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0077] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as a UHF band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0078] Wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed frequency bands. Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0079] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may coexist at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0080] 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., base station 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 relative to a particular orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0081] In some implementations, the described techniques support consideration of reference signals (such as DMRS and Tracking Reference Signal (TRS)) and QCL relationships (e.g., assumptions), including but not limited to those for HST SFN (HST-SFN). For example, a base station 105, which may include at least two TRPs 145 (TRPs) that can be uniformly separated along an HST, may transmit an indication to the UE 115 on that HST regarding the base station 150's ability to perform pre-compensation for the reference signal (e.g., TRS). In some cases, pre-compensation may include Doppler shift pre-compensation for the first TRP 145 and the second TRP 145, or Doppler spread pre-compensation, or a combination thereof. The UE 115 may receive the indication and receive a first TRS associated with the timing of the data channel from the first TRP 145, and a second TRS associated with the timing of the data channel from the second TRP 145. The UE 115 may perform a channel estimation procedure for the data channel based on the received indication, the received first TRS, and the received second TRS.

[0082] Figure 2 Examples of a QCL-type wireless communication system 200 supporting a Doppler-precompensated reference signal, according to various aspects of this disclosure, are described. The wireless communication system 200 may include TRPs 145-a, 145-b, 145-c, and 145-d associated with one or more base stations, and a UE 115-a, which may be as referenced... Figure 1Examples of the described base station and UE 115. In some cases, the TRP may be referred to as a Remote Radio Header (RRH). UE 115-a can be on HST 205 and TRPs 145-a, 145-b, 145-c, and 145-d can operate in the SFN to communicate with the mobile UE 115. HST 205 can carry any number of UE 115s and the SFN can serve some or all of the UE 115s on HST 205. TRPs 145-a, 145-b, 145-c, and 145-d can serve the same geographic coverage area or different geographic coverage areas. In some cases, TRPs 145-a, 145-b, 145-c, and 145-d can implement Doppler pre-compensation procedures. For example, before transmitting the reference signal to UE 115-a via communication links 210-a, 210-b, 210-c, and 210-d, TRPs 145-a, 145-b, 145-c, and 145-d can individually pre-compensate the reference signal associated with each TRP 145 to account for Doppler variations that may be caused by high-speed movement. Additionally or alternatively, other radio devices (such as UE 115-a) can implement Doppler pre-compensation procedures.

[0083] Some wireless communication systems (such as fifth-generation (5G) systems, which may be referred to as new radio (NR) systems) can be designed or configured to efficiently perform downlink multi-antenna transmissions. In downlink multi-antenna transmissions, multiple wireless devices (such as TRP 145) can concurrently or simultaneously transmit downlink information to a network node (such as UE 115). To properly interpret the received transmissions, the wireless devices may need to know one or more attributes of the channel on which one or more transmissions are performed. UE 115, TRP 145, or other wireless devices can estimate aspects of the radio channel based on one or more reference signals transmitted on the radio channel between the wireless devices. Channel estimation helps the wireless devices interpret the received downlink transmissions and associated CSI, etc. The techniques described in this paper provide improved channel estimation for downlink multi-antenna transmissions, including in relatively high-speed scenarios using the concept of QCL.

[0084] In some examples, QCL can assist UE 115 in performing channel estimation and other operations. QCL allows UE 115 to make assumptions or determinations about the relationships between different radio channels associated with different downlink transmissions received at different antenna ports. UE 115 can use QCL assumptions between two or more antenna ports to perform channel estimation for those antenna ports. QCL assumptions can assist UE 115 in determining which reference signals should be used for channel estimation for different downlink transmissions or determining the relevant CSI, and other operations. In some cases, the base station or TRP 145 can signal QCL assumptions to UE 115. UE 115 can receive QCL information in Radio Resource Control (RRC) signaling and can be signaled via separate information elements. The first QCL assumption (e.g., QCL-Type A) may indicate Doppler shift, Doppler spread, average delay, and delay spread. The second QCL assumption (e.g., QCL-Type B) may indicate Doppler shift and Doppler spread. The third QCL assumption (e.g., QCL-type C) may indicate Doppler shift and average delay. The fourth QCL assumption (e.g., QCL-type D) may indicate spatial reception parameters. In some implementations, UE 115 may assume that the reference signal (e.g., non-zero power CSI reference signal (CSI-RS)) and DMRS are QCL. UE 115 may determine the large-scale properties of the downlink channels (e.g., PDSCH, Physical Downlink Control Channel (PDCCH)) through which DMRS is transmitted based on the CSI-RS.

[0085] In some multi-TRP deployments, two or more TRPs 145 can communicate reference signals (e.g., TRS, Phase TRS (PTRS)) to UE 115. For example, as UE 115 moves between two TRPs 145, the UE on the HST can receive reference signals from these TRPs. UE 115 can use the reference signals to determine channel conditions (e.g., CQI, RSRP, RSRQ, SINR, RI) regarding downlink transmissions. In some networks, two or more TRPs 145 can concurrently or simultaneously transmit the same reference signal (e.g., joint SFN reference signal) to UE 115 at the same frequency. These concurrent or nearly simultaneous, identical frequency reference signals can be referred to as SFN reference signals. SFN reference signals can be nearly simultaneous transmissions from multiple geographically separated antennas. For a UE receiving these SFN reference signals, these signals can appear as if the UE is receiving a single reference signal.

[0086] In addition to the reference signal received via the SFN, at least one of these TRPs can transmit a separate, independent reference signal to the UE 115. The UE 115 can use these one or more independent reference signals to perform channel estimation for a specific antenna port that receives the independent reference signal, and also to interpret the channel estimation for the SFN-received reference signal. These techniques can be applied to single-port DMRS for PDSCH or PDCCH, etc. In some cases, the TRS can be an extension of the DMRS, tracking phase changes across transmission duration (e.g., time slots, subframes, symbols). The TRS can track phase noise. Information such as TCI information, which indicates the QCL relationship between the downlink reference signal (e.g., CSI-RS) and the downlink channel DMRS port, allows the UE 115 to perform channel estimation for its radio channels receiving both the SFN-received reference signal and the independent reference signal.

[0087] The techniques described herein can be applied to high-speed scenarios, such as HST-SFN. Note that while the various examples provided herein are discussed with respect to UE 115 in an HST environment, such techniques can be used for any type of communication link where UE 115 travels relative to TRP 145 or a group of TRP 145 (e.g., at high speed relative to TRP 145 or a group of TRP 145). For example, an HST 205 private radio network may include a set of TRP 145s separated along a high-speed railway, and in some cases, these TRP 145s (e.g., any number of TRP 145s) may be evenly spaced such that there are equal or similar distances between each TRP 145. The UE may connect to a certain number (e.g., 4) of the nearest TRP 145s that can share the same cell ID.

[0088] In some scenarios, the high-speed movement of a UE (e.g., UE 115-a) (e.g., via HST 205) and communication on the SFN network can lead to communication challenges, including high Doppler variation, path delay, and difficulty in efficiently estimating channel conditions. In some cases, UE 115 on the HST may experience different Doppler variations and path delays at different locations along the railway. Movement of the transmitter or receiver, or both relative to each other, can cause Doppler variations (e.g., Doppler shift, Doppler spread, path delay). Relative movement can shift and / or spread the frequency of the signal, causing the signal frequency at the receiver to differ from the signal frequency at the transmitter. Thus, the frequency perceived by the receiver may differ from the frequency at which the signal was originally transmitted. For example, when UE 115-a moves at high speed in the direction of TRP 145-c and in the opposite direction of TRP 145-d, UE 115-a can receive reference signals (e.g., combined SFN-via TRPs) in the SFN network via TRPs 145-b and 145-c. The reference signals received by UE 115-a from the two TRPs 145 may undergo Doppler shift, or Doppler spread, or both, where the Doppler shift and spread of the two reference signals can be different. In some cases, the Doppler shift can be the same and relative.

[0089] In some cases, joint reference signals over the SFN can lead to poor channel estimation because the joint reference signals are transmitted using the same TCI state and QCL assumptions, causing two identical joint reference signals received by the UE to interfere with each other, resulting in poor channel estimation. Accordingly, devices connected to the HST private wireless network (e.g., UE 115 on the HST) can be configured to mitigate these challenges.

[0090] To support enhanced wireless communication for devices traveling at high speeds, UE 115 can receive multiple QCL assumptions for a single UEDMRS port. In some cases, TRPs 145, evenly spaced apart beside the HST, can be configured to transmit separate reference signals to UE 115, where these reference signals are transmitted on different DMRS ports according to different TCI states. UE 115 receiving two different reference signals can estimate channel conditions (e.g., PDSCH conditions) more accurately because the different reference signals do not cause interference between them. For example, TRPs 145-b and 145-c can each be associated with different reference signals (such as reference signals 215-a and 215-b). UE 115 connected to TRP 145-b, which may not be on the HST, can receive reference signal 215-a and use it to estimate downlink channel attributes (such as downlink channel 220-a) specific to that UE 115 and TRP 145. Similarly, a UE 115 connected to a TRP 145-c that may not be on the HST can receive reference signal 215-b and use it to estimate downlink channel attributes (such as downlink channel 220-b) specific to that UE 115 and TRP 145. When UE 115-a moves between two TRPs 145, UE 115-a on the HST can receive a first reference signal 215-a from TRP 145-b via communication link 210-b and a second reference signal 215-b from TRP 145-c, where reference signals 215-a and 215-b are not the joint SFN reference signal 215. UE 115-a can estimate the channel attributes (such as SFN downlink channel 225) on the SFN (e.g., SFN PDSCH, SFN PDCCH) based on the received reference signals 215-a and 215-b.

[0091] Due to high-speed travel, UE 115-a may determine that the two received reference signals 215 have two different Doppler variations (such as Doppler shift, Doppler spread, delay, etc.), which can increase the complexity of the UE's channel condition determination. To alleviate the channel estimation complexity at UE 115-a, TRPs 145-b and 145-c can separately pre-compensate the reference signals 215-a and 215-b with Doppler to account for the different Doppler variations between the two reference signals 215. Individual Doppler pre-compensation allows UE 115-a to more accurately determine the downlink channel condition and estimate the Doppler shift and / or spread for future communication with the TRP on the SFN. In some cases, TRP 145 may indicate the pre-compensation configuration to UE 115 before transmitting the pre-compensated reference signal 215 to UE 115.

[0092] Figure 3 Examples of a QCL-type Doppler pre-compensation procedure 300 supporting a Doppler-precompensated reference signal, according to various aspects of this disclosure, are explained. The Doppler pre-compensation procedure 300 can be executed by TRPs 145-e and 145-f associated with one or more base stations, and by a UE 115-b, and can be as described in reference... Figure 1 and 2 The described base station and UE 115 are examples. UE 115-b can move at high speed, and TRPs 145-e and 145-f can operate in the SFN to communicate with the moving UE 115. TRPs 145-e and 145-f can serve the same geographic coverage area or different geographic coverage areas. In some cases, TRPs 145-e and 145-f can implement Doppler pre-compensation procedures. For example, TRPs 145-e and 145-f can individually pre-compensate the reference signal associated with each TRP 145 to account for Doppler variations that may be caused by high-speed movement before transmitting the reference signal to UE 115-b. Additionally or alternatively, other radio devices (such as UE 115-b) can implement Doppler pre-compensation procedures.

[0093] As described herein, TRP 145 in the SFN can be configured to transmit separate reference signals to UE 115 on the HST, where the DMRS port can be associated with more than one TCI state. For example, UE 115-b can be on an HST traveling toward TRP 145-f and away from TRP 145-e. TRP-e can transmit reference signals (e.g., TRS) to UE 115-b via communication link 310-a, and TRP 145-f can transmit reference signals (e.g., TRS) to UE 115-b via communication link 310-b, where the reference signals transmitted by each TRP 145 are different. In some cases, TRP 145 can transmit these reference signals simultaneously. UE 115-b can separately estimate the frequency offset with respect to the two TRP 145s based on the two received reference signals. Based on the two estimated frequency offsets, UE 115-b can calculate a more accurate frequency offset for compensation during channel estimation of the DMRS port (e.g., compensation for Doppler shift and / or spread). In some cases, UE 115-a can calculate the frequency offset per channel and perform optimized estimation of Doppler parameters on a Doppler distribution (e.g., a sparse Doppler distribution).

[0094] Due to its high-speed travel, UE 115 can simultaneously experience two significant and opposite Doppler frequency shifts. For example, the Doppler frequency shift relative to TRP 145-f could be a positive Doppler frequency shift (+f) of the frequency. dFurthermore, the Doppler shift relative to TRP 145-e can be a negative Doppler shift of frequency (-f). d As described herein, downlink channels and DMRS can be transmitted from the coordinated TRP 145 in an SFN manner, while TRS from each TRP 145 can be transmitted independently of each TRP 145. Thus, UE 115 can experience a composite and sparse Doppler distribution for DMRS. In some cases, UE 115 can estimate the Doppler shift from the independent TRS.

[0095] In some implementations, the different Doppler shifts and / or spreads experienced by UE 115 for each TRS can lead to complex channel estimation calculations. To mitigate this complexity, each TRP 145 can perform Doppler shift and / or spread pre-compensation 320 on the TRS. For example, without Doppler shift pre-compensation 320, UE 115-b can receive two separate TRSs and measure different frequency offsets for each TRS, frequency offsets 315-a and 315-b. If the two TRPs 145 instead perform Doppler shift pre-compensation 320 on each TRS before transmission, UE 115-b can still receive two separate TRSs and measure the frequency offset from each TRS. However, with pre-compensation 320, the frequency offsets for the two TRSs may be the same, such as frequency offset 325a. In some cases, TRP 145 can pre-compensate these TRSs so that the frequency offset relative to the Doppler shift is centered around zero. In some cases, the Doppler shift experienced by UE 115 can be within a range (e.g., [-x, x], where x can be less than 100 Hz).

[0096] TRP 145 may indicate to UE 115 whether pre-compensation is applied to the TRS to assist channel estimation before transmitting the pre-compensated reference signal 215 to UE 115. In some cases, this indication may include a pre-compensation configuration, such as the range of pre-compensated Doppler shift. In some cases, UE 115 may be pre-configured with a range of pre-compensated Doppler shift. The Doppler pre-compensation indication may be communicated to UE 115 in one or more ways. In some examples, the Doppler pre-compensation information may be transmitted via higher-layer signaling (e.g., above physical (PHY) or media access control (MAC) layer signaling, such as RRC signaling). In some cases, the indication may be included in the TRS configuration of the RRC signaling. In some cases, the TRS may be configured as a CSI-RS resource set. The TRS information element (IE) may indicate whether the port is pre-compensated for Doppler shift and / or Doppler spread. Additionally or alternatively, the indication of whether the port is pre-compensated may be included in the TCI state configuration of the RRC signaling. In some cases, the TCI status configuration or RRC configuration may include additional fields to indicate whether the Doppler shift is pre-compensated (e.g., the DopplerShift_Compensation field) and / or whether the Doppler spread is pre-compensated.

[0097] In some implementations, UE 115 may send an estimate of the actual experienced Doppler shift or Doppler spectrum, or both, from each independent reference signal 215 and report it back to each independent TRP 145 in a report (e.g., a CSI report). In some cases, each TRP 145 may use feedback to further adjust the Doppler pre-compensation parameters for subsequent communication with UE 115. The report transmitted by UE 115 may include how much Doppler shift UE 115 experienced. In some cases, the report may indicate whether UE 115 experienced more than one Doppler shift, or whether UE 115 experienced only one Doppler shift. If UE 115 experiences and reports two or more Doppler shifts and / or spreads, UE 115 may report the shift and / or spread of the first TRS, and the frequency difference between the first and second Doppler shifts and / or spreads associated with the two TRSs.

[0098] Additionally or alternatively, UE 115 may report the difference between the experienced Doppler shift and / or spread from each received TRS, which may or may not be pre-compensated for Doppler shift and / or spread to aid future channel estimation. In some examples, UE 115 may report the difference in Doppler shift and / or spread from these received TRS if the difference between two shifts and / or spreads exceeds a specified threshold. In some cases, the threshold may be used as an upper limit regarding when UE 115 meets performance requirements. UE 115 may report the threshold capability to TRP 145.

[0099] If the TRS port is Doppler pre-compensated, the UE 115 can be configured with QCL assumptions (e.g., QCL-type E, or another QCL type besides QCL types A, B, C, and D). QCL assumptions can indicate Doppler shift, Doppler spread, delay shift, and delay spread, and can indicate the expected Doppler shift or Doppler spread, or both, within a range. The QCL assumptions can indicate this range, or the UE 115 can be pre-configured with this range. In some cases, QCL assumptions can indicate that the Doppler shift or Doppler spread, or both, is very low.

[0100] In some implementations, the QCL assumption for each DMRS indicating a TRP and a TRS can belong to two QCL types (e.g., QCL type A or QCL type E) so that the QCL assumption can indicate to UE 115 whether pre-compensation is applied to each reference signal. For example, UE 115-a can receive QCL type A for TRS from TRP 145-e and QCL type A for TRP 145-f, such that these TRS can be uncompensated. Additionally or alternatively, UE 115-a can receive QCL type A for TRS from TRP 145-e and QCL type E for TRP 145-f, such that the TRS transmitted from TRP 145-e can be uncompensated, but the TRS from TRP 145-f can be precompensated. Alternatively or alternatively, UE 115-a may receive QCL-type E for TRS from TRP 145-e and QCL-type A for TRP 145-f, such that the TRS transmitted from TRP 145-e may be pre-compensated, but the TRS from TRP 145-f may be uncompensated. Alternatively or alternatively, UE 115-a may receive QCL-type E for TRS from both TRP 145-e and TRP 145-f, such that both TRS transmitted from TRP 145-e and TRP 145-f may be pre-compensated.

[0101] In some implementations, UE 115 may indicate the QCL type and the combination supported by UE 115. In some cases, the baseline configuration that UE 115 may support is QCL-type A for each TRS from each TRP 145. In some cases, UE 115 may indicate to TRP 145 that it supports different capabilities. For example, UE 115-b may indicate to TRP 145 that UE 115-a supports a first capability (e.g., Cap 1) such that it supports QCL-type A for one TRS and QCL-type E from another TRS. Additionally or alternatively, UE 115-b may indicate to TRP 145 that UE 115-b supports a second capability (e.g., Cap 2) such that it supports combinations of QCL-types for each TRS (e.g., QCL-type A+E) and the same QCL types for each TRS (e.g., QCL-type E+E). If the first TRS (e.g., TRS1) is a QCL source for a downlink channel (e.g., PDSCH) that also has a second TRS (e.g., TRS2) as a QCL source that can be QCL-type A or E, then QCL-type E can be configured in the first TRS (e.g., TRS1). When two TRS sources are present, QCL-type E can be scheduled for the downlink channel (e.g., PDSCH).

[0102] In other examples, different combinations of QCL types may be supported and indicated. For example, QCL-type B and QCL-type E, or QCL-type C and QCL-type E, or QCL-type D and QCL-type E may be indicated to UE 115. Similarly, UE 115 may indicate to base station 105 different combinations of QCL types as supported by UE 115. For example, QCL-type B and QCL-type E, or QCL-type C and QCL-type E, or QCL-type D and QCL-type E may be indicated by UE 115 as supported capabilities.

[0103] Figure 4 Examples of a process flow 400 supporting a QCL type for a Doppler pre-compensated reference signal, according to various aspects of this disclosure, are explained. For example, base station 105-a may include TRPs 145-g and 145-h, which can pre-compensate the signal transmitted to UE 115-c. Base station 105-a, TRPs 145-g and 145-h, and UE 115-c can be reference... Figures 1 to 3Examples of corresponding wireless devices described. In some cases, the reference signal pre-compensation procedure is implemented in place of base station 105-a and TRP 145-g and 145-h, and can be performed by different types of wireless devices (e.g., UE 115). The following alternative examples can be implemented, some of which are performed in a different order than described or not at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0104] At 405, UE 115-c may receive an indication of QCL relationships from base station 150a, which indicates the relationship between multiple TRSs and DMRSs of the data channel, the multiple TRSs including at least a first TRS and a second TRS. In some cases, the indicated pre-compensation for the TRS includes Doppler shift pre-compensation, Doppler spread pre-compensation, or a combination thereof for the first TRP and the second TRP.

[0105] In some scenarios, at 410, base station 105-a may optionally perform pre-compensation on a first TRS associated with the timing of a data channel and a second TRS associated with the timing of that data channel. In some scenarios, the timing of the data channel may be an SFN transmission from the first TRP and the second TRP. In some scenarios, UE 115-a may receive the indication in a TRS configuration, wherein the indication may include a CSI-RS resource set. Additionally or alternatively, the indication includes an IE indicating whether the TRS should be recompensated by base station 105-a. In some scenarios, UE 115-a may receive the indication in a beam configuration that may include a TCI state configuration. The indication in the beam configuration may include a field indicating whether the TRS should be pre-compensated by base station 105-a.

[0106] At 415, UE 115-c may receive a first TRS associated with the timing of the data channel from TRP 145-g. At 420, UE 115-c may receive a second TRS associated with the timing of the data channel from TRP 145-h.

[0107] At 425, UE 115-c can perform a channel estimation procedure for the data channel based on the DMRS, the received first TRS, and the received second TRS, according to an indication of the QCL relationship. In some cases, UE 115-a can determine the Doppler shift value, Doppler spread value, or a combination thereof between the received first TRS and the received second TRS. In some cases, UE 115-a can report the determined Doppler shift value, Doppler spread value, or combination thereof to base station 105-a. In some cases, UE 115-a can identify that the determined Doppler shift value, Doppler spread value, or combination thereof exceeds a threshold, and can report the value exceeding the threshold to base station 105-a.

[0108] Figure 5 A block diagram 500 is shown of a QCL-type device 505 supporting a Doppler pre-compensated reference signal according to various aspects of this disclosure. Device 505 may be an example of various aspects of UE 115 as described herein. Device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. Device 505 may also include one or more processors, a memory coupled to the one or more processors, and instructions stored in the memory that can be executed by the one or more processors to enable the one or more processors to perform the Doppler pre-compensation features discussed herein. Each of these components may be in communication with each other (e.g., via one or more buses).

[0109] Receiver 510 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to the QCL type used for Doppler pre-compensated reference signals). This information can be transmitted to other components of device 505. Receiver 510 can be a reference... Figure 8 Examples of various aspects of the transceiver 820 described. The receiver 510 may utilize a single antenna or an array of antennas.

[0110] Communication manager 515 may receive from a base station an indication of a QCL relationship, which specifies the relationship between a plurality of TRSs and a DMRS of a data channel, the plurality of TRSs including at least a first TRS and a second TRS; receive from a first TRP a first TRS associated with the timing of the data channel; receive from a second TRP a second TRS associated with the timing of the data channel; and perform a channel estimation procedure for the data channel based on the indication of the QCL relationship, the DMRS, the received first TRS, and the received second TRS. Communication manager 515 may be an example of aspects of communication manager 810 described herein.

[0111] The communication manager 515 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 515 or its sub-components may be performed by a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0112] The communication manager 515 or its subcomponents may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 515 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 515 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0113] Transmitter 520 can transmit signals generated by other components of device 505. In some examples, transmitter 520 may coexist with receiver 510 in a transceiver module. For example, transmitter 520 may be a reference... Figure 8 Examples of various aspects of the transceiver 820 described. The transmitter 520 may utilize a single antenna or an array of antennas.

[0114] The communication manager 515 described herein can be implemented to achieve one or more potential advantages. One implementation allows device 505 to more efficiently estimate the channel conditions between device 505 and one or more TRPs. For example, device 5050 can receive two different Doppler-precompensated reference signals from multiple TRPs and perform an efficient channel estimation procedure based on the received reference signals.

[0115] Based on the implementation of the pre-compensation technique as described herein, the processor of UE 115 (e.g., as referenced) Figure 8 The described control receiver 510, transmitter 520, or transceiver 820 can increase the reliability and efficiency of communication reference signals between the UE 115 and one or more TRPs, as well as the determination of channel attributes based on these reference signals.

[0116] Figure 6 A block diagram 600 is shown of a QCL-type device 605 supporting a Doppler-precompensated reference signal according to various aspects of this disclosure. Device 605 may be an example of aspects of device 505 or UE 115 as described herein. Device 605 may include a receiver 610, a communication manager 615, and a transmitter 635. Device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0117] Receiver 610 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to the QCL type used for Doppler pre-compensated reference signals). This information can be transmitted to other components of device 605. Receiver 610 can be a reference... Figure 8 Examples of various aspects of the transceiver 820 described. The receiver 610 may utilize a single antenna or an array of antennas.

[0118] Communication manager 615 may be an example of aspects of communication manager 515 as described herein. Communication manager 615 may include pre-compensation indicator 620, TRS manager 625, and channel estimation manager 630. Communication manager 615 may be an example of aspects of communication manager 810 as described herein.

[0119] The pre-compensation indicator 620 can receive an indication of the QCL relationship from the base station, which indicates the relationship between a plurality of TRS and the DMRS of the data channel, the plurality of TRS including at least a first TRS and a second TRS.

[0120] The TRS manager 625 can receive a first TRS associated with the timing of the data channel from a first TRP and a second TRS associated with the timing of the data channel from a second TRP.

[0121] The channel estimation manager 630 can perform a channel estimation procedure for the data channel based on the indication of the QCL relationship, the DMRS, the received first TRS, and the received second TRS.

[0122] Transmitter 635 can transmit signals generated by other components of device 605. In some examples, transmitter 635 may coexist with receiver 610 in a transceiver module. For example, transmitter 635 may be a reference... Figure 8 Examples of various aspects of the transceiver 820 described. The transmitter 635 may utilize a single antenna or an array of antennas.

[0123] In some cases, the pre-compensation indicator 620, TRS manager 625, and channel estimation manager 635 may each be a processor (e.g., a transceiver processor, a radio processor, a transmitter processor, or a receiver processor) or at least a part thereof. The processor may be coupled to memory and execute instructions stored in that memory that enable the processor to perform or facilitate the features of the pre-compensation indicator 620, TRS manager 625, and channel estimation manager 635 as discussed herein. The transceiver processor may coexist with and / or communicate with the transceiver of the device (e.g., instruct the operation of the transceiver). The radio processor may coexist with and / or communicate with the radio of the device (e.g., NR radio, LTE radio, Wi-Fi radio) (e.g., instruct the operation of the radio). The transmitter processor may coexist with and / or communicate with the transmitter of the device (e.g., instruct the operation of the transceiver). The receiver processor may coexist with and / or communicate with the receiver of the device (e.g., instruct the operation of the receiver).

[0124] Figure 7 A block diagram 700 is shown of a communication manager 705 of type QCL supporting a Doppler pre-compensated reference signal according to various aspects of this disclosure. Communication manager 705 may be an example of aspects of communication manager 515, communication manager 615, or communication manager 810 described herein. Communication manager 705 may include a pre-compensation indicator 710, a TRS manager 715, a channel estimation manager 720, a Doppler value manager 725, a QCL manager 730, a signal receiving manager 735, and a signal decoding manager 740. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0125] The pre-compensation indicator 710 can receive from the base station an indication of the QCL relationship, which specifies the relationship between a plurality of TRSs and the DMRS of the data channel, the plurality of TRSs including at least a first TRS and a second TRS. The TRS manager 715 can receive from a first TRP a first TRS associated with the timing of the data channel. In some examples, the TRS manager 715 can receive from a second TRP a second TRS associated with that timing of the data channel. The channel estimation manager 720 can perform a channel estimation procedure for the data channel based on the indication of the QCL relationship, the DMRS, the received first TRS, and the received second TRS.

[0126] In some examples, the pre-compensation indicator 710 may receive an indication that the base station intends to perform pre-compensation for the TRS. In some examples, the pre-compensation indicator 710 may receive this indication in a beam configuration. In some examples, the pre-compensation indicator 710 may receive the DMRS and data signal during the timing of the data channel. In some examples, the pre-compensation indicator 710 may decode the received data signal based on the received DMRS and the indicated QCL relationship.

[0127] In some cases, the indication of QCL relationships includes a field indicating whether multiple TRSs should be pre-compensated by the base station. In some cases, the indicated pre-compensation for multiple TRSs includes Doppler shift pre-compensation, or Doppler spread pre-compensation, or both, for the first TRP and the second TRP. In some cases, the beam configuration includes TCI state configuration. In some cases, this indication in the beam configuration includes a field indicating whether the multiple TRSs should be pre-compensated by the base station. In some cases, the indicated pre-compensation for TRSs includes QCL relationships.

[0128] In some cases, the QCL relationship includes an indication of the Doppler shift between the DMRS and multiple TRS within a first threshold, or the QCL relationship includes an indication of the Doppler spread between the DMRS and multiple TRS within a second threshold, or both. In some cases, the QCL relationship further includes Doppler shift, Doppler spread, average delay, and delay spread.

[0129] In some examples, the TRS manager 715 may receive the indication in a TRS configuration that indicates at least a first resource set for the first TRS and a second resource set for the second TRS. In some examples, the TRS manager 715 may receive a configuration regarding the UE receiving a TRS from a set of TRPs that includes at least a first TRP and a second TRP. In some examples, the TRS manager 715 may receive a third TRS associated with the timing of the data channel from a third TRP of the base station, wherein a channel estimation procedure is performed on the data channel based on the received indication, the received first TRS, the received second TRS, and the received third TRS.

[0130] In some cases, the timing of the data channel is an SFN transmission from the first TRP and the second TRP. In some cases, the timing of the data channel is used for the SFN transmission of the data channel, which includes DMRS from the first TRP and the second TRP. In some cases, the indication of QCL relationships includes an indication of whether multiple TRSs should be pre-compensated by the base station. In some cases, the TRS configuration includes a channel state information reference signal resource set. In some cases, the indication in the TRS configuration includes information elements indicating whether multiple TRSs should be pre-compensated by the base station. In some cases, the first TRP and the second TRP are associated with a layer of the data channel. In some cases, the data channel includes a layer comprising a single layer, and the DMRS of the data channel includes a DMRS port.

[0131] The Doppler value manager 725 can determine a first Doppler frequency shift value, or a first Doppler spread value, or both, associated with a first TRP based on a received first TRS. In some examples, the Doppler value manager 725 can determine a second Doppler frequency shift value, or a second Doppler spread value, or both, associated with a second TRP based on a received second TRS. In some examples, the Doppler value manager 725 can transmit a report to the base station indicating the first Doppler frequency shift value and the second Doppler frequency shift value, or the first Doppler spread value and the second Doppler spread value, or both.

[0132] In some examples, the Doppler value manager 725 may determine a Doppler shift value, or a Doppler spread value, or both, between a received first TRS and a received second TRS. In some examples, the Doppler value manager 725 may report the determined Doppler shift value, or the Doppler spread value, or both, to the base station. In some examples, the Doppler value manager 725 may identify that the determined Doppler shift value exceeds a first threshold, or that the determined Doppler spread value exceeds a second threshold, or both, wherein the determined Doppler shift value is reported to the base station based on the determined Doppler shift value exceeding the first threshold, or the determined Doppler shift value is reported to the base station based on the determined Doppler spread value exceeding the second threshold, or both.

[0133] QCL manager 730 can receive indications of a first QCL relationship between a first TRS and a DMRS of the data channel, and a second QCL relationship between the first TRS and the DMRS of the data channel. Signal receiving manager 735 can receive DMRS and data signals during the data channel's timing. Signal decoding manager 740 can decode the received data signals based on the execution of a channel estimation procedure. Signal decoding manager 740 can decode the received data signals based on the received DMRS, the indicated first QCL relationship, and the indicated second QCL relationship.

[0134] In some cases, the pre-compensation indicator 710, TRS manager 715, channel estimation manager 720, Doppler value manager 725, QCL manager 730, signal receiver manager 735, and signal decoder manager 740 may each be a processor (e.g., a transceiver processor, a radio processor, a transmitter processor, or a receiver processor) or at least a part thereof. The processor may be coupled to a memory and execute instructions stored in that memory that enable the processor to perform or facilitate the features of the pre-compensation indicator 710, TRS manager 715, channel estimation manager 720, Doppler value manager 725, QCL manager 730, signal receiver manager 735, and signal decoder manager 740 as discussed herein.

[0135] Figure 8 A diagram is shown of a system 800 including a QCL-type device 805 supporting a Doppler-precompensated reference signal, according to various aspects of this disclosure. Device 805 may be an example of device 505, device 605, or UE 115 as described herein, or include components thereof. Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., bus 845).

[0136] The communication manager 810 can receive an indication of QCL relationship from the base station, which indicates the relationship between a plurality of TRS and DMRS of the data channel, the plurality of TRS including at least a first TRS and a second TRS, receive a first TRS associated with the timing of the data channel from a first TRP, and receive a second TRS associated with the timing of the data channel from a second TRP; and perform a channel estimation procedure for the data channel based on the indication of QCL relationship, based on the DMRS, the received first TRS, and the received second TRS.

[0137] The I / O controller 815 manages the input and output signals of the device 805. The I / O controller 815 can also manage peripheral devices not integrated into the device 805. In some cases, the I / O controller 815 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 815 may utilize an operating system, such as... Or another known operating system. In other cases, the I / O controller 815 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 815 may be implemented as part of a processor. In some cases, a user may interact with the device 805 via the I / O controller 815 or via hardware components controlled by the I / O controller 815.

[0138] Transceiver 820 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, transceiver 820 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 820 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0139] In some cases, a wireless device may include a single antenna 825. However, in other cases, the device may have more than one antenna 825, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0140] Memory 830 may include random access memory (RAM) and read-only memory (ROM). Memory 830 may store computer-readable, computer-executable code 835, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 830 may particularly include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0141] Processor 840 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, processor 840 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., supporting various functions or tasks of the QCL type for Doppler pre-compensated reference signals).

[0142] Code 835 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 835 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 835 may not be directly executed by processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0143] By including or configuring a communication manager 810 according to the examples described herein, device 805 can support technologies for improved communication reliability, reduced latency, improved user experience associated with reduced processing, reduced power consumption, more efficient use of communication resources, improved coordination between devices, longer battery life, and improved utilization of processing power.

[0144] Figure 9 A block diagram 900 is shown of a QCL-type device 905 supporting a Doppler pre-compensated reference signal according to various aspects of this disclosure. Device 905 may be an example of various aspects of base station 105 as described herein. Device 905 may include a receiver 910, a communication manager 915, and a transmitter 920. Device 905 may also include one or more processors, a memory coupled to the one or more processors, and instructions stored in the memory that can be executed by the one or more processors to enable the one or more processors to perform the Doppler pre-compensation features discussed herein. Each of these components may be in communication with each other (e.g., via one or more buses).

[0145] Receiver 910 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to the QCL type used for Doppler pre-compensated reference signals). This information can be transmitted to other components of device 905. Receiver 910 can be a reference... Figure 12 Examples of various aspects of the transceiver 1220 described. The receiver 910 may utilize a single antenna or an array of antennas.

[0146] The communication manager 915 can transmit to the UE an indication of QCL relationships, which specifies the relationship between a plurality of TRSs and DMRSs of a data channel, the plurality of TRSs including at least a first TRS and a second TRS; transmit the first TRS and DMRSs of the data channel from a first TRP of the base station; and transmit the second TRS and DMRSs of the data channel from a second TRP of the base station. The communication manager 915 may be an example of aspects of the communication manager 1210 described herein.

[0147] The communication manager 915 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 915 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

[0148] The communication manager 915 or its sub-components may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 915 or its sub-components may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 915 or its sub-components may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0149] Transmitter 920 can transmit signals generated by other components of device 905. In some examples, transmitter 920 may coexist with receiver 910 in a transceiver module. For example, transmitter 920 may be a reference... Figure 12 Examples of various aspects of the transceiver 1220 described. The transmitter 920 may utilize a single antenna or an array of antennas.

[0150] By including or configuring a communication manager 915 according to an example as described herein, device 905 (e.g., a processor that controls or otherwise couples to receiver 910, transmitter 920, communication manager 915, or a combination thereof) can support techniques for reducing processing, reducing power consumption, and / or making more efficient use of communication resources.

[0151] Figure 10 A block diagram 1000 is shown of a QCL-type device 1005 supporting a Doppler-precompensated reference signal according to various aspects of this disclosure. Device 1005 may be an example of aspects of device 905 or base station 105 as described herein. Device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1030. Device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0152] Receiver 1010 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to the QCL type used for Doppler pre-compensated reference signals). This information can be transmitted to other components of device 1005. Receiver 1010 can be a reference... Figure 12 Examples of various aspects of the transceiver 1220 described herein. The receiver 1010 may utilize a single antenna or an array of antennas.

[0153] Communication manager 1015 may be an example of aspects of communication manager 915 as described herein. Communication manager 1015 may include pre-compensation module 1020 and TRS module 1025. Communication manager 1015 may be an example of aspects of communication manager 1210 as described herein.

[0154] The pre-compensation module 1020 can transmit an indication of QCL relationship to the UE, which indicates the relationship between multiple TRS and DMRS of the data channel, the multiple TRS including at least a first TRS and a second TRS.

[0155] The TRS module 1025 can transmit a first TRS and a DMRS for the data channel from a first TRP of the base station, and transmit a second TRS and a DMRS for the data channel from a second TRP of the base station.

[0156] Transmitter 1030 can transmit signals generated by other components of device 1005. In some examples, transmitter 1030 may coexist with receiver 1010 in a transceiver module. For example, transmitter 1030 may be a reference... Figure 12 Examples of various aspects of the transceiver 1220 described. The transmitter 1030 may utilize a single antenna or an array of antennas.

[0157] In some cases, the pre-compensation module 1020 and the TRS module 1025 may each be a processor (e.g., a transceiver processor, a radio processor, a transmitter processor, or a receiver processor) or at least a part thereof. The processor may be coupled to memory and execute instructions stored in that memory that enable the processor to perform or facilitate the features of the pre-compensation module 1020 and the TRS module 1025 as discussed herein. The transceiver processor may coexist with and / or communicate with the transceiver of the device (e.g., instruct the operation of the transceiver). The radio processor may coexist with and / or communicate with the radio of the device (e.g., NR radio, LTE radio, Wi-Fi radio) (e.g., instruct the operation of the radio). The transmitter processor may coexist with and / or communicate with the transmitter of the device (e.g., instruct the operation of the transceiver). The receiver processor may coexist with and / or communicate with the receiver of the device (e.g., instruct the operation of the receiver).

[0158] Figure 11A block diagram 1100 is shown of a QCL-type communication manager 1105 supporting a Doppler pre-compensated reference signal according to various aspects of this disclosure. The communication manager 1105 may be an example of aspects of the communication manager 915, communication manager 1015, or communication manager 1210 described herein. The communication manager 1105 may include a pre-compensation module 1110, a TRS module 1115, a signal transmission module 1120, a Doppler value reporting module 1125, and a QCL module 1130. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0159] The pre-compensation module 1110 can transmit an indication of QCL relationships to the UE, specifying the relationship between multiple TRSs and DMRSs of the data channel, wherein the multiple TRSs include at least a first TRS and a second TRS. The TRS module 1115 can transmit the first TRS and DMRSs of the data channel from a first TRP of the base station. In some examples, the TRS module 1115 can transmit the second TRS and DMRSs of the data channel from a second TRP of the base station.

[0160] In some cases, DMRS is transmitted as an SFN transmission from the first TRP and the second TRP. In some cases, the indication of QCL relationships includes an indication of whether multiple TRSs should be pre-compensated by the base station.

[0161] In some examples, the pre-compensation module 1110 may perform pre-compensation on a first TRS associated with the timing of the data channel and a second TRS associated with the timing of the data channel. In some cases, both the first TRS and the second TRS may be pre-compensated.

[0162] In some examples, the pre-compensation module 1110 may transmit to the UE an indication that the base station intends to perform pre-compensation for the TRS. In some examples, the pre-compensation module 1110 may transmit this indication in the beam configuration. In some examples, the pre-compensation module 1110 may modify the pre-compensation performed on subsequent TRS transmitted by the first TRP, or subsequent TRS transmitted by the second TRP, or both, based on received reports.

[0163] In some cases, the indicated pre-compensation for TRS includes Doppler shift pre-compensation, or Doppler spread pre-compensation, or both, for the first TRP and the second TRP. In some cases, the beam configuration includes TCI state configuration. In some cases, the indication in the beam configuration includes a field indicating whether the plurality of TRSs should be pre-compensated by the base station.

[0164] In some examples, TRS module 1115 may transmit the indication in a TRS configuration that at least indicates a first resource set for a first TRS and a second resource set for a second TRS. In some examples, TRS module 1115 may transmit to the UE a configuration for the UE to receive multiple TRSs from a set of TRPs that includes at least a first TRP and a second TRP. In some examples, TRS module 1115 may perform pre-compensation on a third TRS associated with the timing of a data channel. In some examples, TRS module 1115 may transmit a pre-compensated third TRS from a third TRP of the base station.

[0165] In some cases, the TRS configuration includes a Channel State Information Reference Signal Resource Set. In some cases, the indication in the TRS configuration includes information elements indicating whether multiple TRSs should be pre-compensated by the base station. In some cases, the first TRP and the second TRP are associated with a layer of the data channel. In some cases, the data channel comprises a layer, and the DMRS of the data channel includes a DMRS port.

[0166] The signal transmission module 1120 can transmit data signals as SFN transmission from the first TRP and the second TRP at the appropriate time in the data channel.

[0167] In some examples, QCL module 1130 may transmit indications of a first QCL relationship between a first TRS and a DMRS of the data channel, and a second QCL relationship between the first TRS and the DMRS of the data channel. In some examples, signal transmission module 1120 may transmit DMRS and data signals during the data channel's transmission.

[0168] The Doppler value reporting module 1125 can receive reports from the UE indicating a first Doppler frequency shift value associated with a first TRP and a second Doppler frequency shift value associated with a second TRP, or a first Doppler spread value associated with a first TRP and a second Doppler spread value associated with a second TRP, or both.

[0169] In some examples, the Doppler value reporting module 1125 may receive from the UE a report indicating a Doppler frequency shift value or a Doppler spread value, or both, between a first TRS (e.g., in some cases, a pre-compensated first TRS) and a second TRS (e.g., in some cases, a pre-compensated second TRS). In some examples, the Doppler value reporting module 1125 may identify, based on the report received from the UE, that the Doppler frequency shift value exceeds a first threshold, or the Doppler spread value exceeds a second threshold, or both.

[0170] QCL module 1130 can transmit DMRS and data signals during data channel events. In some cases, the indicated pre-compensation for TRS includes a QCL relationship. In some cases, the QCL relationship includes an indication of Doppler shift between DMRS and TRS within a first threshold, or the QCL relationship includes an indication of Doppler spread between DMRS and TRS within a second threshold, or both. In some cases, the QCL relationship further includes Doppler shift, Doppler spread, average delay, and delay spread.

[0171] In some cases, the pre-compensation module 1110, TRS module 1115, signal transmission module 1120, Doppler value reporting module 1125, and QCL module 1130 may each be a processor (e.g., a transceiver processor, a radio processor, a transmitter processor, or a receiver processor) or at least a part thereof. The processor may be coupled to a memory and execute instructions stored in that memory that enable the processor to perform or facilitate the features of the pre-compensation module 1110, TRS module 1115, signal transmission module 1120, Doppler value reporting module 1125, and QCL module 1130 as discussed herein.

[0172] Figure 12 A diagram of a system 1200 including a QCL-type device 1205 supporting a Doppler pre-compensated reference signal is shown according to various aspects of this disclosure. Device 1205 may be an example of device 905, device 1005, or base station 105 as described herein, or a component including the aforementioned devices. Device 1205 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., bus 1250).

[0173] The communication manager 1210 can transmit an indication of QCL relationship to the UE, which indicates the relationship between a plurality of TRS and DMRS of the data channel, the plurality of TRS including at least a first TRS and a second TRS; transmit the first TRS and DMRS of the data channel from a first TRP of the base station; and transmit the second TRS and DMRS of the data channel from a second TRP of the base station.

[0174] The network communication manager 1215 can manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1215 can manage the delivery of data communication by client devices (such as one or more UEs 115).

[0175] Transceiver 1220 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, transceiver 1220 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1220 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0176] In some cases, the wireless device may include a single antenna 1225. However, in other cases, the device may have more than one antenna 1225, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0177] Memory 1230 may include RAM, ROM, or a combination thereof. Memory 1230 may store computer-readable code 1235 including instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform the various functions described herein. In some cases, memory 1230 may, in particular, include a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0178] Processor 1240 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, processor 1240 may be configured to use a memory controller to operate a memory array. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., supporting various functions or tasks of the QCL type for Doppler pre-compensated reference signals).

[0179] Inter-site communication manager 1245 manages communication with other base stations 105 and may include a controller or scheduler for cooperating with other base stations 105 to control communication with UE 115. For example, inter-site communication manager 1245 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, inter-site communication manager 1245 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0180] Code 1235 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 1235 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1235 may not be directly executed by processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0181] By including or configuring a communication manager 1210 according to the examples described herein, device 1205 can support technologies for improved communication reliability, reduced latency, improved user experience associated with reduced processing, reduced power consumption, more efficient use of communication resources, improved coordination between devices, longer battery life, and improved utilization of processing power.

[0182] Figure 13 A flowchart illustrating a method 1300 for a QCL-type reference signal with Doppler pre-compensation, according to various aspects of this disclosure, is shown. Operation of method 1300 may be implemented by a UE 115 or its components as described herein. For example, operation of method 1300 may be implemented by, as described in reference... Figures 5 to 8 The described communication manager 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 following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0183] At 1305, the UE may receive from the base station an indication of QCL relationships, which specifies the relationships between multiple TRSs and DMRSs of the data channel, wherein the multiple TRSs include at least a first TRS and a second TRS. Operation of 1305 may be performed according to the methods described herein. In some examples, aspects of the operation of 1305 may be determined by reference to... Figures 5 to 8 The pre-compensation indicator described is used to perform this.

[0184] At 1310, the UE may receive a first TRS associated with the timing of the data channel from the first TRP (TRP). The operation of 1310 may be performed according to the method described herein. In some examples, aspects of the operation of 1310 may be determined by reference to... Figures 5 to 8 The TRS manager described is used to execute this.

[0185] At 1315, the UE may receive a second TRS associated with that timing of the data channel from the second TRP. The operation of 1315 may be performed according to the method described herein. In some examples, aspects of the operation of 1315 may be determined by reference to... Figures 5 to 8 The TRS manager described is used to execute this.

[0186] At 1320, the UE can perform a channel estimation procedure for the data channel based on the indication of the QCL relationship, the DMRS, the received first TRS, and the received second TRS. The operation of 1320 can be performed according to the method described herein. In some examples, aspects of the operation of 1320 can be derived from, as referenced... Figures 5 to 8 The described channel estimation manager is used to perform this.

[0187] Figure 14 A flowchart illustrating a method 1400 for a QCL-type reference signal supported by various aspects of this disclosure is shown. Operation of method 1400 may be implemented by a UE 115 or its components as described herein. For example, operation of method 1400 may be implemented by, as described in reference... Figures 5 to 8 The described communication manager 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 following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0188] At 1405, the UE may receive from the base station an indication of the QCL relationship, which specifies the relationship between multiple TRSs and the DMRS of the data channel, wherein the multiple TRSs include at least a first TRS and a second TRS. Operation of 1405 may be performed according to the method described herein. In some examples, aspects of the operation of 1405 may be determined by reference to [reference needed]. Figures 5 to 8 The QCL manager described is used for execution.

[0189] At 1410, the UE may receive from the base station an indication that the base station intends to perform pre-compensation for the TRS. The operation of 1410 may be performed according to the method described herein. In some examples, aspects of the operation of 1410 may be determined by reference to... Figures 5 to 8 The pre-compensation indicator described is used to perform this.

[0190] At 1415, the UE may receive a first TRS associated with the timing of the data channel from the first TRP. The operation of 1415 may be performed according to the method described herein. In some examples, aspects of the operation of 1415 may be determined by reference to... Figures 5 to 8 The TRS manager described is used to execute this.

[0191] At 1420, the UE may receive a second TRS associated with that timing of the data channel from the second TRP. The operation of 1420 may be performed according to the method described herein. In some examples, aspects of the operation of 1420 may be determined by reference to... Figures 5 to 8 The TRS manager described is used to execute this.

[0192] At 1425, the UE can perform a channel estimation procedure for the data channel based on the received indication, the received first TRS, and the received second TRS. The operation of 1425 can be performed according to the method described herein. In some examples, aspects of the operation of 1425 can be derived from, as referenced... Figures 5 to 8 The described channel estimation manager is used to perform this.

[0193] At 1430, the UE can receive DMRS and data signals during the data channel. Operation of 1430 can be performed according to the method described herein. In some examples, aspects of operation of 1430 can be determined by referring to... Figures 5 to 8 The described signal receiver manager is used to perform this.

[0194] At 1435, the UE can decode the received data signal based on the execution of a channel estimation procedure. The operation of 1435 can be performed according to the method described herein. In some examples, aspects of the operation of 1435 can be determined by referring to... Figures 5 to 8 The described signal decoding manager is used to perform this.

[0195] Figure 15 A flowchart illustrating a method 1500 for a QCL-type reference signal supported by various aspects of this disclosure is shown. Operation of method 1500 may be implemented by a base station 105 or its components as described herein. For example, operation of method 1500 may be implemented by, as described in reference... Figures 9 to 12 The described communication manager is used to perform this. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the following functions.

[0196] At 1505, the base station may transmit an indication of QCL relationships to the UE, specifying the relationships between multiple TRSs and DMRSs of the data channel, wherein the multiple TRSs include at least a first TRS and a second TRS. Operation of 1505 may be performed according to the methods described herein. In some examples, aspects of the operation of 1505 may be determined by reference to... Figures 9 to 12 The pre-compensation module described is used to perform this.

[0197] In 1510, the base station can transmit a first TRS and a DMRS for the data channel from the base station's first TRP. The operation of 1510 can be performed according to the method described herein. In some examples, aspects of the operation of 1510 can be determined by referring to... Figures 9 to 12 The TRS module described is used for execution.

[0198] In 1515, the base station can transmit the second TRS and the DMRS of the data channel from the base station's second TRP. The operation of 1515 can be performed according to the method described herein. In some examples, aspects of the operation of 1515 can be determined by referring to... Figures 9 to 12 The TRS module described is used for execution.

[0199] Figure 16 A flowchart illustrating a method 1600 for a QCL-type reference signal supported by various aspects of this disclosure is shown. Operation of method 1600 may be implemented by a base station 105 or its components as described herein. For example, operation of method 1600 may be implemented by, as described in reference... Figures 9 to 12 The described communication manager is used to perform this. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the following functions.

[0200] In step 1605, the base station may transmit an indication of QCL relationships to the UE, specifying the relationships between multiple TRSs and DMRSs of the data channel, wherein the multiple TRSs include at least a first TRS and a second TRS. Operation of step 1605 may be performed according to the methods described herein. In some examples, aspects of operation of step 1605 may be determined by reference to... Figures 9 to 12 The pre-compensation module described is used to perform this.

[0201] In 1610, the base station may optionally perform pre-compensation on a first TRS associated with the timing of the data channel and a second TRS associated with the timing of the data channel. The operation of 1610 may be performed according to the method described herein. In some examples, aspects of the operation of 1610 may be determined by reference to... Figures 9 to 12 The pre-compensation module described is used to perform this.

[0202] In step 1615, the base station can transmit the first TRS and the DMRS of the data channel from the base station's first TRP. Operation of step 1615 can be performed according to the method described herein. In some examples, aspects of the operation of step 1615 can be determined by referring to... Figures 9 to 12 The TRS module described is used for execution.

[0203] In 1620, the base station can transmit the second TRS and the DMRS of the data channel from the base station's second TRP. The operation of 1620 can be performed according to the method described herein. In some examples, aspects of the operation of 1620 can be determined by referring to... Figures 9 to 12 The TRS module described is used for execution.

[0204] At 1625, the base station may receive from the UE a report indicating a first Doppler frequency shift value associated with the first TRP and a second Doppler frequency shift value associated with the second TRP, or a first Doppler spread value associated with the first TRP and a second Doppler spread value associated with the second TRP, or both. Operation of 1625 may be performed according to the methods described herein. In some examples, aspects of the operation of 1625 may be determined by reference to... Figures 9 to 12 The described Doppler value reporting module is used for execution.

[0205] At 1630, the base station can modify the pre-compensation performed on subsequent TRS transmitted by the first TRP, or subsequent TRS transmitted by the second TRP, or both, based on the received report. The operation of 1630 can be performed according to the method described herein. In some examples, aspects of the operation of 1630 can be described as follows: Figures 9 to 12 The pre-compensation module described is used to perform this.

[0206] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0207] The following provides an overview of the various aspects of this disclosure:

[0208] Aspect 1: A method for wireless communication at a UE, comprising: receiving from a base station an indication of a quasi-coexistence relationship, the indication indicating a relationship between a plurality of tracking reference signals and demodulation reference signals of a data channel, the plurality of tracking reference signals including at least a first tracking reference signal and a second tracking reference signal; receiving from a first transmit / receive point the first tracking reference signal associated with a timing of the data channel; receiving from a second transmit / receive point the second tracking reference signal associated with the timing of the data channel; and performing a channel estimation procedure for the data channel based at least in part on the indication of the quasi-coexistence relationship, and at least in part on the demodulation reference signals, the received first tracking reference signal, and the received second tracking reference signal.

[0209] Aspect 2: The method of aspect 1, wherein the timing of the data channel is used for single-frequency network transmission of the data channel, the single-frequency network transmission including the demodulation reference signal from the first transmit / receive point and the second transmit / receive point.

[0210] Aspect 3: The method as described in any of Aspects 1 to 2, wherein the indication of the quasi-coexistence relationship includes an indication of whether the plurality of tracking reference signals should be pre-compensated by the base station.

[0211] Aspect 4: The method of aspect 3, wherein the indicated pre-compensation for the plurality of tracking reference signals includes Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first transmit / receive point and the second transmit / receive point.

[0212] Aspect 5: The method of any one of Aspects 1 to 4, wherein receiving an indication of the quasi-coexistence relationship comprises: receiving the indication in a tracking reference signal configuration that indicates at least a first resource set for the first tracking reference signal and a second resource set for the second tracking reference signal.

[0213] Aspect 6: The method of aspect 5, wherein the indication in the tracking reference signal configuration includes an information element indicating whether the plurality of tracking reference signals should be pre-compensated by the base station.

[0214] Aspect 7: The method of any of Aspects 1 to 6, wherein the indication of the quasi-coexistence relationship includes a field indicating whether the plurality of tracking reference signals should be pre-compensated by the base station.

[0215] Aspect 8: The method of any one of Aspects 1 to 7 further comprises: determining, at least in part, a first Doppler frequency shift value or a first Doppler spread value or both associated with the first transmit receiving point based on a received first tracking reference signal; determining, at least in part, a second Doppler frequency shift value or a second Doppler spread value or both associated with the second transmit receiving point based on a received second tracking reference signal; and transmitting to the base station a report indicating the first Doppler frequency shift value and the second Doppler frequency shift value, or the first Doppler spread value and the second Doppler spread value, or both.

[0216] Aspect 9: The method of any one of Aspects 1 to 8, wherein the quasi-coexistence relationship includes an indication of the Doppler frequency shift between the demodulated reference signal and the plurality of tracking reference signals within a first threshold, or the quasi-coexistence relationship includes an indication of the Doppler spread between the demodulated reference signal and the plurality of tracking reference signals within a second threshold, or both.

[0217] Aspect 10: The method of aspect 9, wherein the quasi-coexistence relationship further includes the Doppler frequency shift, the Doppler spread, the average delay, and the delay spread.

[0218] Aspect 11: The method of any one of Aspects 1 to 10 further comprises: receiving the demodulation reference signal and the data signal at the timing of the data channel; and decoding the received data signal at least in part based on the execution of the channel estimation procedure.

[0219] Aspect 12: The method of any one of aspects 1 to 11 further includes: determining a Doppler frequency shift value, or a Doppler spread value, or both, between a received first tracking reference signal and a received second tracking reference signal; and reporting the determined Doppler frequency shift value, or the Doppler spread value, or both, to the base station.

[0220] Aspect 13: The method of aspect 12 further includes: identifying that the determined Doppler frequency shift value exceeds a first threshold, or that the determined Doppler spread value exceeds a second threshold, or both, wherein the determined Doppler frequency shift value is reported to the base station at least in part based on the determined Doppler frequency shift value exceeding the first threshold, or the determined Doppler frequency shift value is reported to the base station at least in part based on the determined Doppler spread value exceeding the second threshold, or both.

[0221] Aspect 14: The method of any of Aspects 1 to 13, wherein the first transmit / receive point and the second transmit / receive point are associated with a layer of the data channel, and the demodulation reference signal of the data channel includes a demodulation reference signal port.

[0222] Aspect 15: A method for wireless communication at a base station, comprising: transmitting to a UE an indication of an alignment coexistence relationship, the indication indicating a relationship between a plurality of tracking reference signals and demodulation reference signals of a data channel, the plurality of tracking reference signals including at least a first tracking reference signal and a second tracking reference signal; transmitting the first tracking reference signal and the demodulation reference signal of the data channel from a first transmit / receive point of the base station; and transmitting the second tracking reference signal and the demodulation reference signal of the data channel from a second transmit / receive point of the base station.

[0223] Aspect 16: The method of aspect 15, wherein the demodulated reference signal is transmitted from the first transmit / receive point and the second transmit / receive point as a single-frequency network transmission.

[0224] Aspect 17: The method of any one of Aspects 15 to 16 further includes: transmitting data signals from the first transmission receiving point and the second transmission receiving point as single-frequency network transmission at the appropriate time on the data channel.

[0225] Aspect 18: The method as described in any of Aspects 15 to 17, wherein the indication of the quasi-coexistence relationship includes an indication of whether the plurality of tracking reference signals should be pre-compensated by the base station.

[0226] Aspect 19: The method of aspect 18, wherein the indicated pre-compensation for the plurality of tracking reference signals includes Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first transmit / receive point and the second transmit / receive point.

[0227] Aspect 20: The method of any of Aspects 15 to 19, wherein transmitting an indication of the quasi-coexistence relationship comprises: transmitting the indication in a tracking reference signal configuration that indicates at least a first resource set for the first tracking reference signal and a second resource set for the second tracking reference signal.

[0228] Aspect 21: The method of any one of aspects 15 to 20 further includes: receiving from the UE a report indicating a Doppler frequency shift value or a Doppler spread value or both between the first tracking reference signal and the second tracking reference signal.

[0229] Aspect 22: The method of any one of aspects 15 to 21 further includes: transmitting to the UE a configuration for the UE to receive the plurality of tracking reference signals from a plurality of transmission receiving points including at least the first transmission receiving point and the second transmission receiving point.

[0230] Aspect 23: The method of any of Aspects 15 to 22, wherein the first transmit / receive point and the second transmit / receive point are associated with a single layer of the data channel, and the demodulation reference signal of the data channel includes a demodulation reference signal port.

[0231] Aspect 24: An apparatus for wireless communication at a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method as described in any of aspects 1 to 14.

[0232] Aspect 25: An apparatus for wireless communication at a UE, comprising at least one means for performing the method as described in any one of aspects 1 to 14.

[0233] Aspect 26: A non-transient computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to perform the methods described in any of Aspects 1 to 14.

[0234] Aspect 27: An apparatus for wireless communication at a base station, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method as described in any of aspects 15 to 23.

[0235] Aspect 28: An apparatus for wireless communication at a base station, comprising at least one means for performing the method as described in any one of aspects 15 to 23.

[0236] Aspect 29: A non-transient computer-readable medium storing code for wireless communication at a base station, the code including instructions executable by a processor to perform the methods described in any of Aspects 15 to 23.

[0237] 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 can also be applied to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques can be applied 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.

[0238] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0239] The various illustrative boxes and components described herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, or any other such configuration).

[0240] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall 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, hardwired, or any combination thereof. Features implementing the functions can also be physically located in various locations, including being distributed such that different parts of the function are implemented at different physical locations.

[0241] Computer-readable media includes both non-transient computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transient storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, non-transient computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transient medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Similarly, any connection is also legitimately 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 that coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used in this article, disk and disc include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks often magnetically reproduce data while discs optically reproduce data using lasers. Combinations of these media are also included within the scope of computer-readable media.

[0242] As used herein (including in the claims), the word "or" in an enumeration of items (e.g., an enumeration of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that an enumeration 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). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of 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".

[0243] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may apply to any of the similar components having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0244] This document, illustrated with reference to the accompanying drawings, describes exemplary configurations but does not represent all examples that can be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not imply "superior" or "outperforming" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0245] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the universal principles defined herein can 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. A method for performing wireless communication at a user equipment (UE), comprising: Receive an indication of a quasi-coexistence relationship, the indication specifying a relationship between a plurality of tracking reference signals and demodulation reference signals of a data channel, the plurality of tracking reference signals including at least a first tracking reference signal and a second tracking reference signal, wherein the indication of the quasi-coexistence relationship includes an indication of whether the plurality of tracking reference signals should be pre-compensated by a network device; Receive the first tracking reference signal associated with the timing of the data channel from the first transmission and reception point; The second tracking reference signal associated with the timing of the data channel is received from the second transmission receiving point, wherein the first transmission receiving point and the second transmission receiving point are associated with a single layer of the data channel; as well as The channel estimation procedure for the data channel is performed at least in part based on the indication of the quasi-coexistence relationship, and at least in part based on the demodulation reference signal, the received first tracking reference signal, and the received second tracking reference signal.

2. The method of claim 1, wherein the timing of the data channel is used for single-frequency network transmission of the data channel, the single-frequency network transmission including the demodulation reference signal from the first transmit / receive point and the second transmit / receive point.

3. The method of claim 1, wherein the indicated pre-compensation for the plurality of tracking reference signals includes indication of Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first transmit / receive point and the second transmit / receive point.

4. The method of claim 1, wherein receiving the indication of the quasi-coexistence relationship comprises: The indication is received in a tracking reference signal configuration, which indicates at least a first resource set for the first tracking reference signal and a second resource set for the second tracking reference signal.

5. The method of claim 4, wherein the indication in the tracking reference signal configuration includes an information element indicating whether a plurality of tracking reference signals should be pre-compensated by the network device.

6. The method of claim 1, wherein the indication of the quasi-coexistence relationship includes a field indicating whether the plurality of tracking reference signals should be pre-compensated by the network device.

7. The method of claim 1, further comprising: The first Doppler frequency shift value or the first Doppler spread value, or both, associated with the first transmit-receive point are determined at least in part based on the received first tracking reference signal. The second Doppler frequency shift value or the second Doppler spread value, or both, associated with the second transmit / receive point are determined at least in part based on the received second tracking reference signal; and Transmit a report indicating the first Doppler frequency shift value and the second Doppler frequency shift value, or the first Doppler spread value and the second Doppler spread value, or both.

8. The method of claim 1, wherein the quasi-coexistence relationship includes an indication of a Doppler frequency shift between the demodulated reference signal and the plurality of tracking reference signals within a first threshold, or the quasi-coexistence relationship includes an indication of a Doppler spread between the demodulated reference signal and the plurality of tracking reference signals within a second threshold, or both.

9. The method of claim 8, wherein the quasi-coexistence relationship further includes the Doppler frequency shift, the Doppler spread, the average delay, and the delay spread.

10. The method of claim 1, further comprising: The demodulation reference signal and the data signal are received at the specified timing in the data channel; as well as The received data signal is decoded at least in part based on the execution of the channel estimation procedure.

11. The method of claim 1, further comprising: Determine the Doppler frequency shift, or Doppler spread, or both, between the received first tracking reference signal and the received second tracking reference signal; as well as The Doppler frequency shift value, or Doppler spread value, or both, determined in the report.

12. The method of claim 11, further comprising: The determination is made if the determined Doppler frequency shift value exceeds a first threshold, or the determined Doppler spread value exceeds a second threshold, or both, wherein the determined Doppler frequency shift value is reported at least in part based on the determined Doppler frequency shift value exceeding the first threshold, or the determined Doppler spread value is reported at least in part based on the determined Doppler spread value exceeding the second threshold, or both.

13. A method for wireless communication at a network device, comprising: The transmission indicates a quasi-coexistence relationship, the indication specifying a relationship between a plurality of tracking reference signals and demodulation reference signals of a data channel, the plurality of tracking reference signals including at least a first tracking reference signal and a second tracking reference signal, wherein the indication of the quasi-coexistence relationship includes an indication of whether the plurality of tracking reference signals should be pre-compensated by network devices; The first tracking reference signal and the demodulation reference signal of the data channel are transmitted from the first transmit / receive point of the network device; as well as The second tracking reference signal and the demodulation reference signal of the data channel are transmitted from a second transmit / receive point of the network device, wherein the first transmit / receive point and the second transmit / receive point are associated with a single layer of the data channel.

14. The method of claim 13, wherein the demodulation reference signal is transmitted from the first transmit / receive point and the second transmit / receive point as a single-frequency network transmission.

15. The method of claim 14, further comprising: Data signals are transmitted from the first and second transmission / reception points as single-frequency network transmissions at the appropriate times on the data channel.

16. The method of claim 13, wherein the indicated pre-compensation for the plurality of tracking reference signals includes indication of Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first transmit / receive point and the second transmit / receive point.

17. The method of claim 13, wherein transmitting the indication of the quasi-coexistence relationship comprises: The indication is transmitted in a tracking reference signal configuration, which at least indicates a first resource set for the first tracking reference signal and a second resource set for the second tracking reference signal.

18. The method of claim 13, further comprising: Receive a report indicating the Doppler frequency shift or Doppler spread or both between the first tracking reference signal and the second tracking reference signal.

19. The method of claim 13, further comprising: The transmission provides a configuration for a user equipment (UE) to receive the plurality of tracking reference signals from a plurality of transmission receiving points, including at least the first transmission receiving point and the second transmission receiving point.

20. The method of claim 13, wherein the first transmit / receive point and the second transmit / receive point are associated with a single layer of the data channel, and the demodulation reference signal of the data channel includes a demodulation reference signal port.

21. An apparatus for performing wireless communication at a user equipment (UE), comprising: processor, Memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, to cause the device to: Receive an indication of a quasi-coexistence relationship, the indication specifying a relationship between a plurality of tracking reference signals and demodulation reference signals of a data channel, the plurality of tracking reference signals including at least a first tracking reference signal and a second tracking reference signal, wherein the indication of the quasi-coexistence relationship includes an indication of whether the plurality of tracking reference signals should be pre-compensated by a network device; The demodulation reference signal is received in the data channel; Receive the first tracking reference signal associated with the timing of the data channel from the first transmission and reception point; The second tracking reference signal associated with the timing of the data channel is received from the second transmission receiving point, wherein the first transmission receiving point and the second transmission receiving point are associated with a single layer of the data channel; as well as The channel estimation procedure for the data channel is performed at least in part based on the indication of the quasi-coexistence relationship, and at least in part based on the demodulation reference signal, the received first tracking reference signal, and the received second tracking reference signal.

22. The apparatus of claim 21, wherein the timing of the data channel is used for single-frequency network transmission of the data channel, the single-frequency network transmission including the demodulation reference signal from the first transmit / receive point and the second transmit / receive point.

23. The apparatus of claim 21, wherein the indicated pre-compensation for the plurality of tracking reference signals includes indication of Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first transmit / receive point and the second transmit / receive point.

24. The apparatus of claim 21, wherein the instructions executable by the processor to receive the indication of the quasi-coexistence relationship can be further executed by the processor to cause the apparatus to: The indication is received in a tracking reference signal configuration, which indicates at least a first resource set for the first tracking reference signal and a second resource set for the second tracking reference signal.

25. The apparatus of claim 24, wherein the indication in the tracking reference signal configuration includes an information element indicating whether a plurality of tracking reference signals should be pre-compensated by a network device.

26. The apparatus of claim 21, wherein the indication of the quasi-coexistence relationship includes a field indicating whether the plurality of tracking reference signals should be pre-compensated by the network device.

27. The apparatus of claim 21, wherein the instructions are further executable by the processor to cause the apparatus to: The first Doppler frequency shift value or the first Doppler spread value, or both, associated with the first transmit-receive point are determined at least in part based on the received first tracking reference signal. The second Doppler frequency shift value or the second Doppler spread value, or both, associated with the second transmit / receive point are determined at least in part based on the received second tracking reference signal; and Transmit a report indicating the first Doppler frequency shift value and the second Doppler frequency shift value, or the first Doppler spread value and the second Doppler spread value, or both.

28. The apparatus of claim 21, wherein the quasi-coexistence relationship includes an indication of a Doppler frequency shift between the demodulated reference signal and the plurality of tracking reference signals within a first threshold, or the quasi-coexistence relationship includes an indication of a Doppler spread between the demodulated reference signal and the plurality of tracking reference signals within a second threshold, or both.

29. The apparatus of claim 28, wherein the quasi-coexistence relationship further includes the Doppler frequency shift, the Doppler spread, the average delay, and the delay spread.

30. The apparatus of claim 21, wherein the instructions are further executable by the processor to cause the apparatus to: The demodulation reference signal and the data signal are received at the specified timing in the data channel; and The received data signal is decoded at least in part based on the execution of the channel estimation procedure.

31. The apparatus of claim 21, wherein the instructions are further executable by the processor to cause the apparatus to: Determine the Doppler frequency shift, or Doppler spread, or both, between the received first tracking reference signal and the received second tracking reference signal; and The Doppler frequency shift value, or Doppler spread value, or both, determined in the report.

32. The apparatus of claim 21, wherein the instructions are further executable by the processor to cause the apparatus to: The determination is made if the determined Doppler frequency shift value exceeds a first threshold, or the determined Doppler spread value exceeds a second threshold, or both, wherein the determined Doppler frequency shift value is reported at least in part based on the determined Doppler frequency shift value exceeding the first threshold, or the determined Doppler spread value is reported at least in part based on the determined Doppler spread value exceeding the second threshold, or both.

33. An apparatus for wireless communication at a network device, comprising: processor, Memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, to cause the device to: The transmission indicates a quasi-coexistence relationship, the indication specifying a relationship between a plurality of tracking reference signals and demodulation reference signals of a data channel, the plurality of tracking reference signals including at least a first tracking reference signal and a second tracking reference signal, wherein the indication of the quasi-coexistence relationship includes an indication of whether the plurality of tracking reference signals should be pre-compensated by network devices; The first tracking reference signal and the demodulation reference signal of the data channel are transmitted from the first transmit / receive point of the network device; as well as The second tracking reference signal and the demodulation reference signal of the data channel are transmitted from a second transmit / receive point of the network device, wherein the first transmit / receive point and the second transmit / receive point are associated with a single layer of the data channel.

34. The apparatus of claim 33, wherein the demodulation reference signal is transmitted from the first transmit / receive point and the second transmit / receive point as a single-frequency network transmission.

35. The apparatus of claim 33, wherein the instructions are further executable by the processor to cause the apparatus to: Data signals are transmitted from the first and second transmission / reception points as single-frequency network transmissions at the appropriate times on the data channel.

36. The apparatus of claim 33, wherein the indicated pre-compensation for the plurality of tracking reference signals includes indication of Doppler frequency shift pre-compensation, or Doppler spread pre-compensation, or both, for the first transmit / receive point and the second transmit / receive point.

37. The apparatus of claim 33, wherein the instructions executable by the processor to transmit the indication of the quasi-coexistence relationship can be further executed by the processor to cause the apparatus to: The indication is transmitted in a tracking reference signal configuration, which at least indicates a first resource set for the first tracking reference signal and a second resource set for the second tracking reference signal.

38. The apparatus of claim 33, wherein the instructions are further executable by the processor to cause the apparatus to: Receive a report indicating the Doppler frequency shift or Doppler spread or both between the first tracking reference signal and the second tracking reference signal.

39. The apparatus of claim 33, wherein the instructions are further executable by the processor to cause the apparatus to: The transmission provides a configuration for a user equipment (UE) to receive the plurality of tracking reference signals from a plurality of transmission receiving points, including at least the first transmission receiving point and the second transmission receiving point.

40. The apparatus of claim 33, wherein the first transmit / receive point and the second transmit / receive point are associated with a single layer of the data channel, and the demodulation reference signal of the data channel includes a demodulation reference signal port.

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