Frequency offset precompensation based on uplink reference signal

Abstract

Methods, systems, and apparatus for wireless communication are described. A user equipment (UE) can determine a first frequency offset associated with a transmission between the UE and the first base station based at least in part on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency. The UE can determine a second frequency offset associated with a transmission between the UE and the second base station based at least in part on a second downlink reference signal transmitted from a second base station using a downlink reference signal frequency. The UE can transmit at least one uplink reference signal to the first base station and the second base station using an uplink reference signal frequency based at least in part on the first and second frequency offsets.

Description

[0001] Cross-references

[0002] This patent application claims the benefits of U.S. Provisional Patent Application No. 63 / 105,095, filed October 23, 2020, entitled “UPLINK REFERENCE SIGNAL-BASED FREQUENCY OFFSET PRE-COMPENSATION”, and U.S. Patent Application No. 17 / 504,750, filed October 19, 2021, entitled “UPLINK REFERENCE SIGNAL-BASED FREQUENCY OFFSET PRE-COMPENSATION”; each of these patent applications has been assigned to its assignee. Technical Field

[0003] The following discussion relates to wireless communication, including frequency offset precompensation based on uplink reference signals. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. 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 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 from multiple communication devices, which may also be referred to as User Equipment (UE). Summary of the Invention

[0005] The described technology relates to improved methods, systems, devices, and apparatuses supporting frequency offset pre-compensation based on uplink reference signals. In a broader sense, aspects of the described technology support various mechanisms that enable the use of sounding reference signals (SRS) to assist frequency offset pre-compensation processing in single-frequency network (SFN) scenarios. In an SFN scenario, two base stations may each transmit downlink reference signals (DL-RS) to user equipment (UE) (e.g., a UE traveling along a path associated with a high rate). The DL-RS can be transmitted using the same frequency (e.g., the DL-RS center frequency). The UE receives two different DL-RS from the base stations and determines the corresponding frequency offset for each DL-RS (e.g., for each of the two base stations). Based on the different frequency offsets, the UE can select the frequency for transmitting uplink reference signal (UL-RS) transmissions (e.g., SRS transmissions) to different base stations. The UE may use a weighting factor when selecting the UL-RS frequency (different or identical weighting factors correspond to different base stations). The UL-RS may be shifted at least to a certain extent from the DL-RS center frequency based on the corresponding frequency offset and, where applicable, a weighting factor. A base station receiving SRS transmissions from a UE can use the received SRS frequency (e.g., the UL-RS center frequency) to determine the frequency shift used for pre-compensating data transmission to the UE. That is, a base station performing downlink data transmission to the UE can select the frequency for downlink data transmission based on the UL-RS frequency (e.g., perform frequency offset pre-compensation based on the UL-RS to identify or otherwise select the receiving frequency for downlink data transmission to the UE). Therefore, the base station can use the received center frequency to perform downlink data transmission to the UE, thereby mitigating or, where possible, eliminating different frequency offsets from the base station. This allows the UE to use the received center frequency to receive downlink data transmissions (and perform other communications with the base station). The described technique can be used to continuously and / or as needed update the received center frequency according to periodic and / or aperiodic scheduling for communication with the UE based on UE mobility.

[0006] A method for wireless communication at a UE is described. The method may include: determining a first frequency offset associated with a transmission between the UE and the first base station based on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency; determining a second frequency offset associated with a transmission between the UE and the second base station based on a second downlink reference signal transmitted from a second base station using the same downlink reference signal frequency; transmitting at least one uplink reference signal to the first base station and the second base station using uplink reference signal frequencies based on the first and second frequency offsets; and receiving downlink data transmission from the first base station or the second base station at a receiving frequency based on the uplink reference signal frequency.

[0007] 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 can be executed by the processor to cause the apparatus to: determine a first frequency offset associated with a transmission between the UE and the first base station based on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency; determine a second frequency offset associated with a transmission between the UE and the second base station based on a second downlink reference signal transmitted from a second base station using the same downlink reference signal frequency; transmit at least one uplink reference signal to the first base station and the second base station using uplink reference signal frequencies based on the first and second frequency offsets; and receive downlink data transmission from the first base station or the second base station at a receiving frequency based on the uplink reference signal frequency.

[0008] Another apparatus for wireless communication at a UE is described. The apparatus may include components for: determining a first frequency offset associated with a transmission between the UE and the first base station based on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency; determining a second frequency offset associated with a transmission between the UE and the second base station based on a second downlink reference signal transmitted from a second base station using the same downlink reference signal frequency; transmitting at least one uplink reference signal to the first base station and the second base station using uplink reference signal frequencies based on the first and second frequency offsets; and receiving downlink data transmission from the first base station or the second base station at a receiving frequency based on the uplink reference signal frequency.

[0009] A non-transitory computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: determine a first frequency offset associated with a transmission between the UE and the first base station based on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency; determine a second frequency offset associated with a transmission between the UE and the second base station based on a second downlink reference signal transmitted from a second base station using the same downlink reference signal frequency; transmit at least one uplink reference signal to the first base station and the second base station using uplink reference signal frequencies based on the first and second frequency offsets; and receive downlink data transmission from the first base station or the second base station at a reception frequency based on the uplink reference signal frequency.

[0010] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying weighting factors to be applied to a first frequency offset, a second frequency offset, or both, and for determining an uplink reference signal frequency based on the first frequency offset, the second frequency offset, and the weighting factors.

[0011] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving configuration signals indicating weighting factors.

[0012] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving configuration signals that identify downlink reference signal frequencies.

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for transmitting an uplink reference signal autonomously by the UE using the uplink reference signal frequency in response to determining a first frequency offset and a second frequency offset.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a trigger message that triggers transmission of an uplink reference signal using the uplink reference signal frequency.

[0015] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a first uplink spatial filter configuration for transmitting at least one uplink reference signal to a first base station based on a first downlink spatial filter configuration associated with a first downlink reference signal and a second downlink spatial filter configuration associated with a second downlink reference signal, and for transmitting the uplink reference signal to a first base station, a second base station, or both based on the first uplink spatial filter configuration.

[0016] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, a first downlink spatial filter configuration, a second downlink spatial filter configuration or both may be identified based on a downlink transport configuration indicator (TCI).

[0017] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the first uplink spatial filter configuration may be associated with the first downlink spatial filter configuration and the second downlink spatial configuration based on spatial relationship information indication, uplink TCI or both.

[0018] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving authorization to schedule downlink data transmission and for identifying, based on the authorization, a spatial filter configuration for a demodulation reference signal to be transmitted along with the downlink data transmission.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a weighted average of a first frequency offset and a second frequency offset, and for identifying an uplink reference signal frequency based on the weighted average.

[0020] A method for wireless communication at a base station is described. The method may include: transmitting a first downlink reference signal to a UE using a downlink reference signal frequency; receiving at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with a transmission between the UE and a first base station and a second frequency offset associated with a transmission between the UE and a second base station; and transmitting downlink data transmission to the UE at a receiving frequency based on the uplink reference signal frequency for the UE.

[0021] An apparatus for wireless communication at a first base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executed by the processor to cause the apparatus to: transmit a first downlink reference signal to a UE using a downlink reference signal frequency; receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with transmission between the UE and the first base station and a second frequency offset associated with transmission between the UE and a second base station; and transmit downlink data transmission to the UE at a receive frequency based on the uplink reference signal frequency for the UE.

[0022] Another apparatus for wireless communication at a first base station is described. The apparatus may include components for: transmitting a first downlink reference signal to a UE using a downlink reference signal frequency; receiving at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with a transmission between the UE and the first base station and a second frequency offset associated with a transmission between the UE and a second base station; and transmitting downlink data to the UE at a receiving frequency based on the uplink reference signal frequency for the UE.

[0023] A non-transitory computer-readable medium is described, storing code for wireless communication at a first base station. The code may include instructions executable by a processor to: transmit a first downlink reference signal to a UE using a downlink reference signal frequency; receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with a transmission between the UE and the first base station and a second frequency offset associated with a transmission between the UE and a second base station; and transmit downlink data to the UE at a receive frequency based on the uplink reference signal frequency for the UE.

[0024] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a configuration signal to a UE indicating a weighting factor to be applied to a first frequency offset, a second frequency offset, or both, wherein the UE determines an uplink reference signal frequency based on the first frequency offset, the second frequency offset, and the weighting factor.

[0025] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for transmitting configuration signals that identify downlink reference signal frequencies.

[0026] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, in response to the UE determining a first frequency offset and a second frequency offset, the UE autonomously uses the uplink reference signal frequency to transmit an uplink reference signal.

[0027] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a trigger message to the UE to trigger transmission of an uplink reference signal using an uplink reference signal frequency.

[0028] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an uplink reference signal from a UE based on a first uplink spatial filter configuration, wherein the first uplink spatial filter configuration for receiving the uplink reference signal from the UE may be based on a first downlink spatial filter configuration associated with a first downlink reference signal.

[0029] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for transmitting downlink spatial relation information indications, uplink TCI indications, or both, wherein a first downlink spatial filter configuration may be based on the indication.

[0030] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving authorization to schedule downlink data transmission, wherein the spatial filter configuration for a demodulation reference signal transmitted together with the downlink data transmission is based on the authorization.

[0031] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a received frequency based on a weighted average of a first frequency offset and a second frequency offset, wherein the received frequency may be based on the weighted average.

[0032] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying differences between uplink reference signal frequencies and downlink reference signal frequencies, and for identifying receive frequencies for downlink data transmission to the UE based on these differences.

[0033] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for coordinating with a second base station to identify a receive frequency for downlink data transmission to the UE. Attached Figure Description

[0034] Figure 1 An example of a system for wireless communication that supports frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure is illustrated.

[0035] Figure 2 An example of a wireless communication system supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is illustrated.

[0036] Figure 3 An example of a process supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure is illustrated.

[0037] Figure 4 and Figure 5 A block diagram of a device supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown.

[0038] Figure 6 A block diagram of a communication manager supporting frequency offset pre-compensation based on uplink reference signals, according to various aspects of this disclosure, is shown.

[0039] Figure 7 A diagram of a system including a device supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown.

[0040] Figure 8 and Figure 9 A block diagram of a device supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown.

[0041] Figure 10 A block diagram of a communication manager supporting frequency offset pre-compensation based on uplink reference signals, according to various aspects of this disclosure, is shown.

[0042] Figure 11 A diagram of a system including a device supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown.

[0043] Figures 12 to 16 A flowchart is shown illustrating a method for frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure. Detailed Implementation

[0044] Some wireless communication systems can use a single-frequency network (SFN), in which multiple base stations or transmit / receive points (TRPs) use the same center frequency for downlink transmission to user equipment (UE). In some cases (e.g., when a base station transmits a synchronization signal block (SSB), different base stations or TRPs can transmit the same SSB at the same spatial location on the same frequency. For example, an SFN can be used for communication with one or more UEs on a train. UEs on the train and / or otherwise associated with the train (e.g., UEs implemented on the train to provide connectivity) can receive SSBs from both a first base station and a second base station. Because the base stations can coordinate with each other, SSBs received simultaneously from different base stations can share the same SSB identifier.

[0045] However, in this high-speed train scenario, the train / UE can move so fast that the Doppler effect can become problematic. A signal received on the train may experience a large frequency shift in one direction (because the train / UE is rapidly moving away from the base station), while another signal may experience a large frequency shift in a different direction (because the train / UE is rapidly moving towards the base station). Therefore, various aspects of the described techniques support different mechanisms for frequency shift pre-compensation performed at each base station.

[0046] The aspects of this disclosure are initially described in the context of wireless communication systems. Generally, the described techniques support various mechanisms for wireless communication in a wireless network. More broadly, the aspects of the described techniques support various mechanisms that allow the use of a sounding reference signal (SRS) to assist frequency offset pre-compensation processing in an SFN scenario. In an SFN scenario, two base stations may each transmit a downlink reference signal (DL-RS) to a UE (e.g., a UE associated with a high rate, traveling along a path, etc.). The DL-RS can be transmitted using the same reference frequency (e.g., the DL-RS or the carrier center frequency). The UE receives two different DL-RS from the base stations and determines the corresponding frequency offset for each DL-RS (e.g., for each of the two base stations). Based on the different frequency offsets, the UE can select the frequency for transmitting uplink reference signal (UL-RS) transmissions (e.g., SRS transmissions) to different base stations. The UE may use a weighting factor (different or the same weighting factor corresponds to different base stations) when selecting the UL-RS frequency. The UL-RS may be frequency-shifted at least to a certain extent from the DL-RS or the carrier center frequency based on the corresponding frequency offset and, where applicable, a weighting factor. A base station receiving SRS transmissions from a UE can use the received SRS frequency (e.g., the UL-RS center frequency) to determine the frequency shift used for pre-compensating data transmission to the UE. That is, a base station performing downlink data transmission to the UE can select the frequency for downlink data transmission based on the UL-RS frequency (e.g., perform frequency offset pre-compensation based on the UL-RS to identify or otherwise select the receiving frequency for downlink data transmission to the UE). Therefore, the base station can use the received center frequency to perform downlink data transmission to the UE, thereby mitigating or, where possible, eliminating different frequency offsets from the base station. This allows the UE to use the received center frequency to receive downlink data transmissions (and perform other communications with the base station). The described technique can be used to continuously and / or as needed update the received center frequency according to periodic and / or aperiodic scheduling for communication with the UE based on UE mobility.

[0047] The various aspects of this disclosure are further illustrated and described in conjunction with apparatus diagrams, system diagrams, and flowcharts relating to frequency offset precompensation based on uplink reference signals.

[0048] Figure 1An example of a wireless communication system 100 supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure is illustrated. 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 LTE-A Advanced (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.

[0049] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 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 over the coverage area. Coverage area 110 can be an example of a geographical area over which base stations 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0050] UE 115 can be distributed throughout the entire coverage area 110 of the wireless communication system 100, and each UE 115 can be fixed or mobile, or fixed or mobile at different times. UE 115 can be devices of different forms or with different capabilities. Figure 1 Some example UE 115s are shown in the document. The UE 115 described herein can be able to communicate with various types of devices, such as other UE 115s, base station 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 As shown.

[0051] Base station 105 may communicate with core network 130, communicate with each other, or both. For example, base station 105 may interface with core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) or both via 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.

[0052] 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 station transceiver, radio base station, access point, radio transceiver, NodeB, eNodeB (eNB), next-generation NodeB or giga-NodeB (any of which may be referred to as gNB), home NodeB, home eNodeB or other suitable terms.

[0053] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a 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, etc., which may be implemented in various objects such as home appliances or vehicles, meters, etc.

[0054] The UE 115 described in this document can communicate with various types of devices, such as other UEs 115 that can sometimes act as relays, as well as base station 105 and network devices including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 As shown.

[0055] 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 collection of radio 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 (e.g., bandwidth portion (BWP)) of a radio spectrum band that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating operations for carriers, user data, or other signaling. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0056] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and can be located according to a channel grating for discovery by the UE 115. A carrier may operate in standalone mode, where initial acquisition and connection can be performed by the UE 115 via the carrier, or the carrier may operate in non-standalone mode, where the connection is anchored using different carriers (e.g., the same or different radio access technologies).

[0057] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0058] A carrier can be associated with a specific bandwidth of the radio spectrum, and in some examples, the carrier bandwidth can be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth can be one of several defined bandwidths of a carrier used for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) can have a hardware configuration that supports communication on a specific carrier bandwidth, or can be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 can be configured to operate on a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0059] The signal waveform transmitted via a carrier can consist of 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 can 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 can depend on the modulation scheme (e.g., the order of the modulation scheme, the decoding rate of the modulation scheme, or both). Therefore, 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 potentially achieve. Wireless communication resources can refer to a combination of radio spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further improve the data rate or data integrity for communication with the UE 115.

[0060] One or more parameter sets can be supported for a carrier, where the parameter set may include subcarrier spacing (Δf) and cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter sets. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be restricted to one or more active BWPs.

[0061] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, for example, the basic time unit can refer to T. s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, and N f It can represent the maximum supported Discrete Fourier Transform (DFT) size. Communication resources can be organized into time intervals based on radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by its System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0062] 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 be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple 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 multiple symbol periods (e.g., depending on the length of the cyclic prefix pre-added to each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots containing one or more symbols. In addition to 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 spacing or the operating frequency band.

[0063] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0064] Physical channels can be multiplexed on a carrier using various techniques. For example, one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used to multiplex physical control channels and physical data channels on a downlink carrier. 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 be extended across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) can be configured for a set of UEs 115. For example, one or more UEs 115 can monitor or search for 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 at one or more aggregation levels arranged in a cascaded manner. The 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 for a control information format having a given payload size. The search space set can include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0065] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with base station 105 (e.g., via a carrier) and may be associated with an identifier used to distinguish neighboring cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or other identifier). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors such as the capabilities of base station 105, the extent of these cells can range from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, etc.

[0066] Macro cells typically cover a relatively large geographical area (e.g., a radius of several kilometers) and can allow unrestricted access for UE 115 with a service subscription to a network provider supporting the macro cell. In contrast, small cells can be associated with a lower-power base station 105 and can operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells can provide unrestricted access to UE 115 through a service subscription to a network provider, or restricted access to UE 115 associated with the small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), UE 115 associated with a user in a home or office, etc.). Base station 105 can support one or more cells and can also support communication on one or more cells using one or more component carriers.

[0067] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access to different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0068] In some examples, base station 105 may be mobile, and thus provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. 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 for various geographic coverage areas 110.

[0069] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately aligned in time. For asynchronous operation, base stations 105 can have different frame timing, and in some examples, transmissions from different base stations 105 can be misaligned in time. The techniques described herein can be used for both synchronous and asynchronous operation.

[0070] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices that can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC can include communication from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents it to humans interacting with the application. Some UE 115 devices can be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based service charging.

[0071] Some UE 115s can be configured to operate in a power-saving mode, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception, but not both simultaneously). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power-saving techniques for UE 115s include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UE 115s can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a carrier's guard band, or outside a carrier.

[0072] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private or group communication and can be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include prioritizing services that can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency are used interchangeably herein.

[0073] In some examples, UE 115 is also able to communicate directly with other UE 115 via device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UE 115s utilizing D2D communication can be within the geographic coverage area 110 of base station 105. Other UE 115s in this group may be outside the geographic coverage area 110 of base station 105 or unable to receive transmissions from base station 105. In some examples, the group of UE 115s communicating via D2D communication can 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 UE 115s without involving base station 105.

[0074] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signal control, weather, safety, emergencies, or any other information related to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units), or communicate with the network via vehicle-to-network (V2N) communication through one or more network nodes (e.g., base station 105), or both.

[0075] Core network 130 can provide 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), and can include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) 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)) routing packets or interconnects to external networks. The control plane entity can manage non-access stratum (NAS) functions associated with core network 130 for UE 115 served by base station 105, such as mobility, authentication, and bearer management. User IP packets can be delivered through the user plane entity, which can provide IP address allocation and other functions. This user plane entity can connect to IP service 150 for one or more network operators. IP service 150 can 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 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. The region from 300 MHz to 3 GHz is generally referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range extends from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features; however, the waves may be sufficient to penetrate structures to enable macrocells to provide service to UE 115 located indoors. Compared to transmission using smaller frequencies and longer waves in the lower frequencies (HF) or very high frequencies (VHF) portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0078] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) region (also known as the centimeter band) using a frequency band from 3 GHz to 30 GHz, or in the extremely high frequency (EHF) region (e.g., from 30 GHz to 300 GHz) using a spectrum also known as the millimeter band. In some examples, the wireless communication system 100 may support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer even greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory authority.

[0079] The wireless communication system 100 can utilize both licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can use Licensed Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed 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 can employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed bands can be based on carrier aggregation configurations that combine component carriers operating in licensed bands (e.g., LAA). Operation in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0080] Base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques 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, which can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with multiple rows and columns of antenna ports, which 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, antenna panels may support radio frequency beamforming for signals transmitted via antenna ports.

[0081] Base station 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique can be referred to as spatial multiplexing. For example, multiple signals can be transmitted by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals can be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) in which multiple spatial layers are transmitted to the same receiving device and multi-user MIMO (MU-MIMO) in which multiple spatial layers are transmitted to multiple devices.

[0082] 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 or 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 in a particular direction relative to 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 shifts, phase shifts, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element can be defined by a beamforming weight set associated with a particular direction (e.g., relative to the antenna array of the transmitting or receiving device, or relative to some other direction).

[0083] Base station 105 or UE 115 may use beam scanning technology as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals based on different beamforming weight sets associated with different transmission directions. Beam directions may be identified using transmissions in different beam directions (e.g., by a transmitting device such as base station 105, or by a receiving device such as UE 115) for later transmission or reception by base station 105.

[0084] Some signals (such as data signals associated with a specific receiving device) may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with a receiving device such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0085] In some examples, multiple beam directions can be used to perform transmissions by a device (e.g., base station 105 or UE 115), and the device can use a combination of digital pre-decoding or radio frequency beamforming to generate combined beams for (e.g., from base station 105 to UE 115) transmissions. UE 115 can report feedback indicating pre-decoding weights for one or more beam directions, and this feedback can correspond to a configured number of beams across the system bandwidth or one or more sub-bands. Base station 105 can transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may be pre-decoded or undecoded. UE 115 can provide feedback for beam selection, which can be a pre-decoded matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0086] When receiving various signals such as synchronization signals, reference signals, beam selection signals, or other control signals from base station 105, the receiving device (e.g., UE 115) can attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device can attempt multiple receiving directions by: receiving via different antenna subarrays; processing the received signal according to different antenna subarrays; receiving according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different sets of directional listening weights); or processing the received signal according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which can be referred to as "listening" according to different receiving configurations or receiving directions. In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving data signals). The single receiving configuration can be aligned on a beam direction determined based on listening according to different receiving configuration directions (e.g., determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or a beam direction with other acceptable signal quality based on listening according to multiple beam directions).

[0087] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly for communication on logical channels. The media access control (MAC) layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections (which support radio bearers for user plane data) between UE115 and base station 105 or core network 130. At the physical layer, transport channels can be mapped to physical channels.

[0088] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique to increase the likelihood of correct data reception over communication link 125. HARQ can include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in a previous symbol within a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0089] UE 115 can determine a first frequency offset associated with transmission between UE 115 and the first base station based at least in part on a first downlink reference signal transmitted from the first base station using a downlink reference signal center frequency. UE 115 can determine a second frequency offset associated with transmission between UE 115 and the second base station based at least in part on a second downlink reference signal transmitted from the second base station using a downlink reference signal center frequency. UE 115 can transmit at least one uplink reference signal to the first base station and the second base station using an uplink reference signal center frequency at least in part based on the first and second frequency offsets. UE 115 can receive downlink data transmission from either the first base station or the second base station at a receive center frequency at least in part based on the uplink reference signal center frequency.

[0090] Base station 105 (which may be the first base station and / or the second base station in the above example) may transmit a first downlink reference signal to UE 115 using a downlink reference signal center frequency. Base station 105 may receive at least one uplink reference signal from UE 115 at a receive center frequency at least partially based on a first frequency offset associated with transmission between UE 115 and the first base station and a second frequency offset associated with transmission between UE 115 and the second base station. Base station 105 may transmit downlink data transmission to UE 115 using a downlink data transmission center frequency pre-compensated for at least the first frequency offset, wherein the downlink data transmission center frequency is at least partially based on the receive center frequency.

[0091] Figure 2An example of a wireless communication system 200 supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is illustrated. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. The wireless communication system 200 may include base station 205, base station 210, and / or UE 215, which may be examples of the corresponding devices described herein. In some aspects, the wireless communication system 200 may support SFN communication. In some aspects, base station 205 and base station 210 may be examples of TRPs and / or Remote Radio Headers (RRHs), which may be associated with the same base station (e.g., coordinated) or may be associated with separate base stations (e.g., uncoordinated).

[0092] SFN transmission may include the simultaneous transmission of the same signal for multiple spatially dispersed base stations (e.g., base station 205 and base station 210, which may be examples of such TRP / RRH). In some aspects, joint processing of the transmitted signal (e.g., layer splitting, joint pre-decoding, etc.) may not be applied. The receiver (e.g., UE 215 in this example) may obtain macro diversity and / or frequency diversity gain in the SFN scenario. For SFN transmission using beamforming, the same transmitted signal may be transmitted simultaneously or sequentially from the same and / or different TRPs through multiple beams.

[0093] Within the wireless communication system 200, single TRP communication and SFN communication can coexist. For example, SFN can be suitable for certain deployment scenarios where mobility management may present problems (e.g., high-speed train scenarios where the UE / train is moving at 500 km / h or higher). SFN can be suitable for certain service types, such as broadcast / multicast services and / or traffic. Such SFN communication can be area-, direction-, and / or beam-specific. For example, SSB transmissions can occur in high-speed train SFN scenarios. For some SSB timings (e.g., timings at TRP boundaries), multiple TRPs can use the same SSB identifier to transmit simultaneously. Multiple transmission beams of the SFN SSB can be specified to focus / overlap on a single point / area on the high-speed train path, thereby maximizing gain.

[0094] In the high-speed train SFN scenario, Doppler frequency shifts from two (or more) SFN TRPs can generate two relatively strong and widely spaced frequency offset components in the received signal (e.g., relative to the center frequency (F). c ) frequency offset (f dFor example, line-of-sight (LoS) communication can dominate in typical high-speed train deployments (e.g., rural dedicated linear deployments along railway lines). A two-tap high-speed train SFN channel model can be employed. Due to the non-scattering richness in the high Doppler shift, the spectrum of the SFN signal at the TRP boundary is at the offset frequency (e.g., ±f). d Under these conditions, there can be two dominant modes, such as the Doppler power spectral density (PSD) of a high-speed train (e.g., Figure 2 (As shown). The frequency separation between the two components can be derived from the difference in Doppler shift. In this mixed offset scenario, channel estimation in Doppler compensation becomes more problematic.

[0095] Therefore, various aspects of the described techniques can provide a variety of techniques to support frequency offset pre-compensation as a solution to the mixed Doppler shift problem. Frequency offset pre-compensation can allow each TRP (e.g., base station 205 and / or base station 210) to pre-rotate the transmitted signal according to the Doppler shift of each signal received at UE 215, thereby achieving Doppler-free or minimizing the Doppler shift to a minimum or at least manageable level. In some aspects, the described techniques provide an SRS-based frequency offset pre-compensation process implemented between base station 205, base station 210, and UE 215 to eliminate or otherwise mitigate Doppler shift.

[0096] For example, base station 205 (which can be considered as the first base station / TRP / RRH in this example) and base station 210 (which can be considered as the second base station / TRP / RRH in this example) can use the DL-RS center frequency (e.g., F). c The base station 205 and / or 210 transmit corresponding first and second DL-RS signals to the UE 215. The DL-RS can correspond to any signal transmitted by the base station 205 and 210. For example, the DL-RS can correspond to a Tracking Reference Signal (TRS), Channel State Information Reference Signal (CSI-RS), Beam Management Reference Signal (BMRS), Synchronization Signal, SSB Signal, etc. The base station 205 and / or 210 can transmit or otherwise convey to the UE 215 indications of configuration signals identifying various aspects of the DL-RS. For example, the configuration signals can identify the DL-RS center frequency, timing information, spatial information, etc., associated with the corresponding DL-RS transmission.

[0097] In some respects, for frequency offset (e.g., Doppler shift) measurements, DL-RS (e.g., TRS) resources from each SFN base station / TRP / RRH can be used. DL-RS pairs can be bundled into a single resource set, with each transmission triggered together according to an aperiodic, semi-persistent, and / or aperiodic manner.

[0098] UE 215 may receive and determine (e.g., measure and / or estimate) a first DL-RS transmitted from a first base station (e.g., base station 205) to identify or otherwise determine a first frequency offset (e.g., F) associated with the transmission between UE 215 and the first base station. c -f d UE 215 may receive and measure a second DL-RS transmitted from a second base station (e.g., base station 210) to identify or otherwise determine a second frequency offset (e.g., F) associated with the transmission between UE 215 and the second base station. c +f d In some aspects, this may include UE 215 receiving a first DL-RS and measuring the corresponding receiving frequency, and receiving a second DL-RS and measuring the corresponding receiving frequency. In some aspects, UE 215 can estimate a first frequency offset associated with base station 205 by measuring the receiving frequency of the first DL-RS received by UE 215. Similarly, UE 215 can estimate a second frequency offset associated with base station 210 by measuring the receiving frequency of the second DL-RS received by UE 215. In this example, UE 215 may not know the DL-RS center frequency in advance. In other examples, UE 215 may be configured with a DL-RS center frequency (e.g., via configuration signaling). In this example, based on the measured receiving frequency and the known DL-RS center frequency (e.g., as indicated in the configuration signaling), UE 215 may be able to determine the first frequency offset and the second frequency offset. This can be illustrated in Table 1 below, where references to offset frequencies are in absolute value form, f d1 Corresponding to the first frequency offset, and f d2 This corresponds to the second frequency offset.

[0099]

[0100]

[0101] Table 1

[0102] UE 215 may transmit or otherwise transmit UL-RS using a UL-RS center frequency based on a first frequency offset and / or a second frequency offset (e.g., UL-RS may include UL-RS using frequency f). SRS (SRS transmission). In some aspects, the UL-RS center frequency may be selected or otherwise based on a first frequency offset associated with a first base station (e.g., base station 205) and / or a second frequency offset associated with a second base station (e.g., base station 210).

[0103] In some aspects, this may include UE 215 determining a weighted average of the first frequency offset and the second frequency offset (e.g., based on a weighting factor). That is, UE 215 may use a weighting factor associated with the first base station and / or the second base station. For example, for a DL-RS pair (or a DL-RS group in which more than two SFN base stations / TRP / RRH are used), a weighting factor α≤1 may be configured for UE 215 via configuration signaling (e.g., via higher-layer signaling, RRC signaling, MAC control element (CE), downlink control information (DCI), etc.). For example, base station 205 and / or base station 210 may send or otherwise transmit configuration signaling to UE 215 indicating the first frequency offset (e.g., F) associated with the first base station. c -f d This may correspond to the received frequency of the first DL-RS measured by UE 215) and / or the second frequency offset associated with the second base station (e.g., F). c +f d This can correspond to the weighting factor of the second DL-RS received by the UE 215. If the weighting factor is not indicated to the UE 215, the default value can be configured as follows: And / or UE 215 may independently assume or select preferred default values. Therefore, UE 215 may identify or otherwise determine the weighting factors to be applied to the first frequency offset and / or the second frequency offset. UE 215 may identify or otherwise select the UL-RS center frequency (e.g., f) based on a weighted average. SRS ).

[0104] Therefore, UE 215 can determine the transmission frequency of SRS transmission (e.g., f) by taking a weighted average of two frequency offset estimates. SRS In a non-restricted example, UE 215 can use formula f. SRS =F c +αf d1 +(1-α)f d1 To determine the UL-RS center frequency. In some respects, UL-RS transmission can be based on each base station / TRP / RRH. This can be illustrated in Table 2 below, where the references to the offset frequency are in absolute value form, f d1 Corresponding to the first frequency offset, and f d2 This corresponds to the second frequency offset.

[0105]

[0106]

[0107] Table 2

[0108] Therefore, SRS resources (e.g., UL-RS resources) can be configured in association with DL-RS. SRS transmissions can be automatically triggered by DL-RS and / or triggered individually in an aperiodic, semi-persistent, and / or aperiodic manner. For example, UE 215 can autonomously trigger UL-RS transmissions using the UL-RS center frequency in response to measurements of a first frequency offset and a second frequency offset. Additionally or alternatively, base station 205 and / or base station 210 can send or otherwise transmit (and UE 215 can receive or otherwise obtain) a trigger message that triggers UL-RS transmissions using the UL-RS center frequency. In some aspects, periodic and / or semi-persistent DL-RS and associated SRS can be configured with the same periodicity but with different offsets (e.g., different offsets in the time domain). In some aspects, aperiodic triggering of DL-RS can also trigger aperiodic transmissions of SRS. The association between DL-RS and SRS (e.g., UL-RS) can be configured based on quasi-co-location (QCL) assumptions, spatial relationship configurations, etc. For example, the SRS-SpatialRelationInfo information element (IE) can be expanded to include two or more DL-RS, one for each TRP. In another example, the association can be based on the UL Transport Configuration Indicator (TCI) status.

[0109] In other words, UE 215 can utilize beamforming technology when providing UL-RS to the first and second base stations. For example, UE 215 can identify a first uplink spatial filter configuration for transmitting UL-RS to the first base station. In at least some examples, the first uplink spatial filter configuration can be based on a first downlink spatial filter configuration for transmitting the first DL-RS. That is, UE 215 can use a downlink beamforming configuration or another spatial filter configuration associated with the first DL-RS from the first base station when selecting an uplink transmission beam for UL-RS transmission to the first base station. Similarly, UE 215 can identify a second uplink spatial filter configuration for transmitting UL-RS to the second base station. In at least some examples, the second uplink spatial filter configuration can be based on a second downlink spatial filter configuration for transmitting the second DL-RS. That is, UE 215 can use a downlink beamforming configuration or another spatial filter configuration associated with the second DL-RS from the second base station when selecting an uplink transmission beam for UL-RS transmission to the second base station. Therefore, UE 215 can transmit UL-RS to the first base station and / or the second base station based on the first uplink spatial filter configuration and / or the second uplink spatial filter configuration. As described above, the association between DL-RS and UL-RS can be based on the first downlink spatial filter configuration and / or the second downlink spatial filter configuration, based on downlink spatial relationship information indication, uplink TCI status, and / or downlink TCI status, etc. In some aspects, the first uplink spatial filter configuration can be associated with the first downlink spatial configuration and / or the second downlink spatial configuration via spatial relationship information indication and / or uplink TCI status. In some aspects, UE 215 can use an identified or otherwise selected beam / spatial filter configuration to transmit a single SRS for UL-RS so that it can reach both base station 205 and base station 210 simultaneously.

[0110] Therefore, base station 205 and / or base station 210 can receive UL-RS transmissions (e.g., SRS transmissions) from UE 215, which are based on at least some aspects of a first frequency offset and a second frequency offset. Therefore, base station 205 and / or base station 210 can perform frequency offset pre-compensation determination to identify a downlink data transmission center frequency for pre-compensating the first frequency offset and / or the second frequency offset. For example, base station 205 and / or base station 210 can identify the difference between the received center frequency (e.g., the frequency at which the base station receives UL-RS) and the DL-RS center frequency. In some examples, base station 205 and base station 210 can coordinate with each other (e.g., when associated with the same base station) to identify or otherwise select a downlink data transmission center frequency for downlink data transmission to UE 215. In other examples, base station 205 and base station 210 may not coordinate with each other in identifying or otherwise selecting the downlink data transmission center frequency (e.g., when not associated with the same base station).

[0111] In a non-coordinated pre-compensation example, this could include TRP1 (e.g., base station 205 in this example) and TRP2 (e.g., base station 210 in this example) independently or autonomously identifying or otherwise selecting the downlink data transmission center frequency. For example, due to certain constraints (such as delay constraints), TRP1 and TRP2 may not coordinate to derive the Doppler pre-compensation factor. Instead, each TRP can negotiate the frequency offset (relative to carrier / center frequency F) measured via UL-RS (e.g., SRS transmission) from UE 215. c In the example where the weighting factor α is applied (e.g., ), SRSTx frequency f SRS Demodulation Reference Signal (DMRS) Rx Frequency f DMRS It can approximate the actual carrier / center frequency F c (For example, This can be illustrated in Table 3 below, where the references to the offset frequency are in absolute value form, f d1 Corresponding to the first frequency offset, and f d2 This corresponds to the second frequency offset.

[0112]

[0113] Table 3

[0114] In a centralized pre-compensation example, this could include TRP1 (e.g., base station 205 in this example) and TRP2 (e.g., base station 210 in this example) coordinating to jointly identify or otherwise select the downlink data transmission center frequency. For example, TRP1 and TRP2 could exchange one or more radio and / or backhaul messages to jointly derive the Doppler pre-compensation factor. In this example, the DMRS Rx frequency can be the same as the SRS Tx frequency (e.g., f...). SRS =f DMRS This can be illustrated in Table 4 below, where the references to the offset frequency are in absolute value form, f d1 Corresponding to the first frequency offset, and f d2 This corresponds to the second frequency offset.

[0115]

[0116] Table 4

[0117] Therefore, for SFN data with frequency offset pre-compensation (e.g., downlink data transmission, which may correspond to Physical Downlink Shared Channel (PDSCH) transmission), the QCL assumption for DMRS (e.g., DL-RS transmitted with data) using TCI code points by the scheduling DCI is that the TCI code points are associated with two DL-RS (e.g., TRS for frequency offset measurement), an SRS resource indicator (SRI), a TCI state with the source SRS (e.g., a unified TCI state), etc. For example, base station 205 and / or base station 210 (e.g., the base station scheduling downlink data transmission) can send an authorization to schedule downlink data transmission. The spatial filter configuration for the DMRS transmitted with the downlink data transmission can be based on this authorization. UE 215 can identify the spatial filter configuration for the DMRS transmitted with the downlink data transmission based on indications carried or otherwise transmitted in this authorization (e.g., DCI authorization).

[0118] Therefore, base station 205 and / or base station 210 may use a downlink data transmission center frequency pre-compensated based on frequency offset to transmit or otherwise provide (and UE 215 may receive or otherwise obtain) one or more subsequent downlink data transmissions. In some aspects, the downlink data transmission center frequency may be based at least in part on the receive center frequency of the UL-RS transmission received by the corresponding base station from UE 215 (e.g., a measured center frequency).

[0119] Figure 3An example of a process 300 supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure is illustrated. In some examples, process 300 may implement various aspects of wireless communication systems 100 and / or 200. Various aspects of process 300 may be implemented at or by UE 305, base station 310 and / or base station 315, which may be examples of the corresponding devices described herein. In some aspects, base station 310 may be considered a first base station, and base station 315 may be considered a second base station. In some aspects, base station 310 and / or base station 315 may be examples of standalone base stations, TRPs, and / or RRHs (associated with the same or different base stations). In some aspects, base station 310 and / or base station 315 may communicate with UE 305 using SFN technology.

[0120] At 320, UE 305 can determine (by estimation or measurement) a first frequency offset associated with the transmission between UE 305 and base station 310. For example, UE 305 can use the DL-RS center frequency (e.g., F... c The UE 305 measures the first DL-RS (e.g., TRS) transmitted from the base station 310. This may include the UE 305 measuring the receive center frequency of the DL-RS (e.g., the frequency at which the UE 305 receives the DL-RS), the receive power level, the receive phase shift, etc.

[0121] Similarly, at 325, UE 305 can determine (by estimation or measurement) a second frequency offset associated with the transmission between UE 305 and base station 315. For example, UE 305 can use the DL-RS center frequency (e.g., F... c The UE 305 measures the second DL-RS (e.g., TRS) transmitted from the base station 315. This may include the UE 305 measuring the receive center frequency of the DL-RS (e.g., the frequency at which the UE 305 receives the DL-RS), the receive power level, the receive phase shift, etc.

[0122] In some respects, UE 305 may be configured with a DL-RS center frequency. For example, base station 310 and / or base station 315 may send or otherwise transmit a configuration signal identifying the DL-RS center frequency to UE 305.

[0123] At 330, UE 305 may transmit or otherwise provide (and base stations 310 and / or 315 may receive or otherwise acquire) UL-RS using a UL-RS center frequency based at least in some respects on a first frequency offset and / or a second frequency offset. For example, UE 305 may identify (e.g., autonomously and / or based on configuration signals from base stations 310 and / or 315) a weighting factor (e.g., α) to be applied to the first frequency offset and / or the second frequency offset. UE 305 may identify, determine, or otherwise select the UL-RS center frequency based on the first frequency offset, the second frequency offset, and / or the weighting factor.

[0124] In some respects, UE 305 can autonomously transmit UL-RS using the UL-RS center frequency in response to measuring a first frequency offset and a second frequency offset. Additionally or alternatively, UE 305 can receive triggers to use the UL-RS center frequency (e.g., f...). SRS The UE 305 may initiate a UL-RS transmission trigger message. In some aspects, this may include the UE 305 identifying or otherwise determining a weighted average of a first frequency offset and / or a second frequency offset. The UE 305 may identify or otherwise select the UL-RS center frequency based on the weighted average (e.g., using a weighting factor α). In some aspects, base stations 310 and / or 315 may transmit or otherwise provide (and the UE 305 may receive or otherwise obtain) a configuration signal indicating the weighting factor to be applied to the first frequency offset and / or the second frequency offset. As discussed, the UL-RS center frequency may be based on the first frequency offset, the second frequency offset, and the weighting factor.

[0125] In some respects, the DL-RS and the corresponding UL-RS can be beamformed transmissions. For example, the first DL-RS may have a corresponding first downlink spatial filter configuration, and the second DL-RS may have a corresponding second downlink spatial filter configuration. Therefore, UE 305 can identify or otherwise select a first uplink spatial filter configuration for transmitting UL-RS to base stations 310 and 315. UE 305 can transmit UL-RS to the first base station (e.g., base station 310) and / or the second base station (e.g., base station 315) based on the first uplink spatial filter configuration. As discussed, the association between the DL-RS and UL-RS can be based on spatial filter configuration, downlink spatial relationship information indication, uplink TCI status, etc.

[0126] At 335, base station 310 may optionally identify the downlink data transmission center frequency based on the received frequency of the UL-RS transmitted from UE 305 at 330. For example, base station 310 may identify the received center frequency and the DL-RS center frequency (e.g., F...). c The differences between them. Base station 310 uses these differences to identify or otherwise select the downlink data transmission center frequency for the corresponding downlink data transmission to UE 305.

[0127] Similarly, at 340, base station 315 may optionally identify the downlink data transmission center frequency based on the received frequency of the UL-RS transmitted from UE 305 at 330 received by base station 315. For example, base station 315 may identify the received center frequency as being similar to the DL-RS center frequency (e.g., F...). c The differences between them. Base station 315 uses these differences to identify or otherwise select the downlink data transmission center frequency for the corresponding downlink data transmission to UE 305.

[0128] In some respects, base stations 310 and 315 can coordinate with each other to identify the downlink data transmission center frequency for downlink data transmission to UE 305. In other respects, base stations 310 and 315 can each identify the downlink data transmission center frequency.

[0129] At 345, base station 310 may transmit or otherwise provide (and UE 305 may receive or otherwise obtain) downlink data transmission at a receive center frequency based at least in some respects on the UL-RS center frequency. Although process 300 shows downlink data transmission performed by base station 310, it should be understood that base station 315 may implement various aspects of the described techniques when performing downlink data transmission to UE 305.

[0130] In some respects, this may include authorization transmitted or otherwise provided by base station 310 (and received or otherwise obtained by UE 305) for scheduling downlink data transmission. UE 305 may use this authorization to identify the spatial filter configuration of the DMRS to be transmitted along with the downlink data transmission.

[0131] Figure 4 A block diagram 400 is shown of a device 405 supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure. Device 405 may be an example of various aspects of UE 115 as described herein. Device 405 may include a receiver 410, a communication manager 415, and a transmitter 420. Device 405 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0132] Receiver 410 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 frequency offset pre-compensation based on uplink reference signals). This information can be transmitted to other components of device 405. Receiver 410 can be a reference... Figure 7 Examples of various aspects of the transceiver 720 are described. The receiver 410 may utilize a single antenna or an antenna set.

[0133] Communication manager 415 may: determine a first frequency offset associated with transmission between the UE and the first base station based on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency; determine a second frequency offset associated with transmission between the UE and the second base station based on a second downlink reference signal transmitted from a second base station using a downlink reference signal frequency; transmit at least one uplink reference signal to the first base station and the second base station using an uplink reference signal frequency based on the first and second frequency offsets; and receive downlink data transmission from the first base station or the second base station at a receive frequency based on the uplink reference signal frequency. Communication manager 415 may be an example of aspects of communication manager 710 described herein.

[0134] The communication manager 415 or its sub-components may be implemented in hardware, in code executed by a processor (e.g., software), or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 415 or its sub-components may be performed by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

[0135] The communication manager 415 or its subcomponents may be physically located in various locations, including distributed components such that parts of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 415 or its subcomponents may be independent and distinct components according to various aspects of this disclosure. In some examples, the communication manager 415 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, other computing devices, one or more other components described in this disclosure, or combinations thereof according to various aspects of this disclosure.

[0136] Transmitter 420 can transmit signals generated by other components of device 405. In some examples, transmitter 420 may be co-located with receiver 410 in a transceiver module. For example, transmitter 420 may be a reference... Figure 7 Examples of various aspects of the transceiver 720 are described. The transmitter 420 may utilize a single antenna or a set of antennas.

[0137] Figure 5 A block diagram 500 of a device 505 supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure is shown. Device 505 may be an example of various aspects of device 405 or UE 115 as described herein. Device 505 may include a receiver 510, a communication manager 515, and a transmitter 535. Device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0138] 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 frequency offset pre-compensation based on uplink reference signals). This information can be transmitted to other components of device 505. Receiver 510 can be a reference... Figure 7 Examples of various aspects of the transceiver 720 are described. The receiver 510 may utilize a single antenna or an antenna set.

[0139] Communication manager 515 may be an example of aspects of communication manager 415 as described herein. Communication manager 515 may include frequency offset manager 520, uplink reference signal manager 525, and downlink data transmission manager 530. Communication manager 515 may be an example of aspects of communication manager 710 described herein.

[0140] The frequency offset manager 520 can determine a first frequency offset associated with the transmission between the UE and the first base station based on a first downlink reference signal transmitted from the first base station using the downlink reference signal frequency, and determine a second frequency offset associated with the transmission between the UE and the second base station based on a second downlink reference signal transmitted from the second base station using the downlink reference signal frequency.

[0141] The uplink reference signal manager 525 can send at least one uplink reference signal to the first base station and the second base station using uplink reference signal frequencies based on a first frequency offset and a second frequency offset.

[0142] The downlink data transmission manager 530 can receive downlink data transmission from a first base station or a second base station at a receiving frequency based on the uplink reference signal frequency.

[0143] Transmitter 535 can transmit signals generated by other components of device 505. In some examples, transmitter 535 can be co-located with receiver 510 in a transceiver module. For example, transmitter 535 can be a reference. Figure 7 Examples of various aspects of the transceiver 720 are described. The transmitter 535 may utilize a single antenna or a set of antennas.

[0144] Figure 6 A block diagram 600 is shown of a communication manager 605 supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure. The communication manager 605 may be an example of aspects of communication manager 415, communication manager 515, or communication manager 710 as described herein. The communication manager 605 may include a frequency offset manager 610, an uplink reference signal manager 615, a downlink data transmission manager 620, a weighting factor manager 625, a configuration manager 630, an uplink reference signal transmission manager 635, a spatial configuration manager 640, and a scheduling manager 645. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0145] Frequency offset manager 610 can determine a first frequency offset associated with transmission between the UE and the first base station based on a first downlink reference signal transmitted from the first base station using a downlink reference signal frequency. In some examples, frequency offset manager 610 can determine a second frequency offset associated with transmission between the UE and the second base station based on a second downlink reference signal transmitted from the second base station using a downlink reference signal frequency.

[0146] The uplink reference signal manager 615 can send at least one uplink reference signal to the first base station and the second base station using uplink reference signal frequencies based on a first frequency offset and a second frequency offset.

[0147] The downlink data transmission manager 620 can receive downlink data transmission from a first base station or a second base station at a receiving frequency based on the uplink reference signal frequency.

[0148] The weighting factor manager 625 can identify weighting factors to be applied to a first frequency offset, a second frequency offset, or both. In some examples, the weighting factor manager 625 can determine the uplink reference signal frequency based on the first frequency offset, the second frequency offset, and the weighting factors. In some examples, the weighting factor manager 625 can receive a configuration signal indicating the weighting factors. In some examples, the weighting factor manager 625 can determine a weighted average of the first and second frequency offsets. In some examples, the weighting factor manager 625 can identify the uplink reference signal frequency based on the weighted average.

[0149] Configuration Manager 630 can receive configuration signals that identify the downlink reference signal frequency.

[0150] The uplink reference signal transmission manager 635 can, in response to measurements of a first frequency offset and a second frequency offset, allow the UE to autonomously transmit an uplink reference signal using the uplink reference signal frequency. In some examples, the uplink reference signal transmission manager 635 can receive a trigger message that initiates the transmission of an uplink reference signal using the uplink reference signal frequency.

[0151] The spatial configuration manager 640 can identify a first uplink spatial filter configuration for transmitting at least one uplink reference signal based on a first downlink spatial filter configuration associated with a first downlink reference signal and a second downlink spatial filter configuration associated with a second downlink reference signal. In some examples, the spatial configuration manager 640 can transmit uplink reference signals to a first base station and a second base station based on the first uplink spatial filter configuration. In some cases, the first downlink spatial filter configuration, the second downlink spatial filter configuration, or both are identified based on the downlink TCI state. In some cases, the first uplink spatial filter configuration can be associated with the first downlink spatial configuration and / or the second downlink spatial configuration based on spatial relationship information indication and / or the uplink TCI state.

[0152] The scheduler manager 645 can receive authorization to schedule downlink data transmission. In some examples, the scheduler manager 645 can determine the spatial filter configuration for the demodulation reference signal to be transmitted along with the downlink data transmission based on this authorization.

[0153] Figure 7A diagram of a system 700 including a device 705 supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown. Device 705 may be an example of device 405, device 505, or UE 115 as described herein, or may include components thereof. Device 705 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 710, an I / O controller 715, a transceiver 720, an antenna 725, a memory 730, and a processor 740. These components may communicate electronically via one or more buses (e.g., bus 745).

[0154] The communication manager 710 can: determine a first frequency offset associated with the transmission between the UE and the first base station based on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency; determine a second frequency offset associated with the transmission between the UE and the second base station based on a second downlink reference signal transmitted from a second base station using a downlink reference signal frequency; transmit at least one uplink reference signal to the first base station and the second base station using an uplink reference signal frequency based on the first and second frequency offsets; and receive downlink data transmission from the first base station or the second base station at a receiving frequency based on the uplink reference signal frequency.

[0155] The I / O controller 715 can manage the input and output signals of device 705. The I / O controller 715 can also manage peripheral devices not integrated into device 705. In some cases, the I / O controller 715 can represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 715 can utilize, for example... The operating system 705 may be a known operating system or another known operating system. In other cases, the I / O controller 715 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 715 may be implemented as part of a processor. In some cases, a user may interact with the device 705 via the I / O controller 715 or via hardware components controlled by the I / O controller 715.

[0156] Transceiver 720 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, transceiver 720 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 720 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.

[0157] In some cases, a wireless device may include a single antenna 725. However, in other cases, the device may have more than one antenna 725, which is capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0158] Memory 730 may include random access memory (RAM) and read-only memory (ROM). Memory 730 may store computer-readable, computer-executable code 735, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 730 may, in particular, include a basic input / output system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0159] Processor 740 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 740 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 740. Processor 740 may be configured to execute computer-readable instructions stored in memory (e.g., memory 730) to cause device 705 to perform various functions (e.g., functions or tasks supporting frequency offset pre-compensation based on uplink reference signals).

[0160] Code 735 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 735 may be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, code 735 may not be directly executed by processor 740, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein.

[0161] Figure 8 A block diagram 800 of a device 805 supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown. Device 805 may be an example of various aspects of base station 105 as described herein. Device 805 may include a receiver 810, a communication manager 815, and a transmitter 820. Device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0162] Receiver 810 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 frequency offset pre-compensation based on uplink reference signals). This information can be transmitted to other components of device 805. Receiver 810 can be a reference... Figure 11 Examples of various aspects of the transceiver 1120 are described. The receiver 810 may utilize a single antenna or an antenna set.

[0163] Communication manager 815 can: transmit a first downlink reference signal to the UE using a downlink reference signal frequency; receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with a transmission between the UE and a first base station and a second frequency offset associated with a transmission between the UE and a second base station; and transmit downlink data transmission to the UE at a receive frequency based on the uplink reference signal frequency for the UE. Communication manager 815 can be an example of aspects of communication manager 1110 described herein.

[0164] The communication manager 815 or its sub-components may be implemented in hardware, in code (e.g., software) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 815 or its sub-components may be performed by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

[0165] The communication manager 815 or its subcomponents may be physically located in various locations, including distributed components such that parts of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 815 or its subcomponents may be independent and distinct components according to various aspects of this disclosure. In some examples, the communication manager 815 or its subcomponents may be combined with one or more other hardware components, including but not limited to I / O components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof according to various aspects of this disclosure.

[0166] Transmitter 820 can transmit signals generated by other components of device 805. In some examples, transmitter 820 can be co-located with receiver 810 in a transceiver module. For example, transmitter 820 can be a reference... Figure 11 Examples of various aspects of the transceiver 1120 are described. The transmitter 820 may utilize a single antenna or a set of antennas.

[0167] Figure 9A block diagram 900 of a device 905 supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure is shown. Device 905 may be an example of aspects of device 805 as described herein or base station 105. Device 905 may include a receiver 910, a communication manager 915, and a transmitter 935. Device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0168] 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 frequency offset pre-compensation based on uplink reference signals). This information can be transmitted to other components of device 905. Receiver 910 can be a reference... Figure 11 Examples of various aspects of the transceiver 1120 described. The receiver 910 may utilize a single antenna or an antenna set.

[0169] Communication manager 915 may be an example of aspects of communication manager 815 as described herein. Communication manager 915 may include downlink reference signal manager 920, uplink reference signal manager 925, and downlink data transmission manager 930. Communication manager 915 may be an example of aspects of communication manager 1110 described herein.

[0170] The downlink reference signal manager 920 can use the downlink reference signal frequency to send the first downlink reference signal to the UE.

[0171] The uplink reference signal manager 925 can receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with transmission between the UE and the first base station and a second frequency offset associated with transmission between the UE and the second base station.

[0172] The downlink data transmission manager 930 can send downlink data transmissions to the UE at a receive frequency based on the uplink reference signal frequency used by the UE.

[0173] Transmitter 935 can transmit signals generated by other components of device 905. In some examples, transmitter 935 can be co-located with receiver 910 in a transceiver module. For example, transmitter 935 can be a reference... Figure 11 Examples of various aspects of the transceiver 1120 are described. The transmitter 935 may utilize a single antenna or an antenna set.

[0174] Figure 10A block diagram 1000 of a communication manager 1005 supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown. The communication manager 1005 may be an example of aspects of communication manager 815, communication manager 915, or communication manager 1110 as described herein. The communication manager 1005 may include a downlink reference signal manager 1010, an uplink reference signal manager 1015, a downlink data transmission manager 1020, a weighting factor manager 1025, a configuration manager 1030, an uplink reference signal transmission manager 1035, a spatial configuration manager 1040, a scheduling manager 1045, a frequency offset manager 1050, and a coordination manager 1055. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0175] The downlink reference signal manager 1010 can use the downlink reference signal frequency to send a first downlink reference signal to the UE.

[0176] The uplink reference signal manager 1015 can receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with transmission between the UE and a first base station and a second frequency offset associated with transmission between the UE and a second base station. In some cases, in response to the UE determining the first and second frequency offsets, the UE autonomously uses the uplink reference signal frequency to transmit the uplink reference signal.

[0177] The downlink data transmission manager 1020 can send downlink data transmissions to the UE at a receive frequency based on the uplink reference signal frequency used by the UE.

[0178] The weighting factor manager 1025 can send a configuration signal to the UE indicating a weighting factor to be applied to a first frequency offset, a second frequency offset, or both, wherein the UE determines the uplink reference signal frequency based on the first frequency offset, the second frequency offset, and the weighting factor. In some examples, the weighting factor manager 1025 can identify the received frequency based on a weighted average of the first and second frequency offsets, wherein the received frequency is based on the weighted average.

[0179] Configuration manager 1030 can send a configuration signal that identifies the downlink reference signal frequency. Uplink reference signal transmission manager 1035 can send a trigger message to the UE to trigger the transmission of uplink reference signals using the uplink reference signal frequency.

[0180] The spatial configuration manager 1040 can receive an uplink reference signal from the UE based on a first uplink spatial filter configuration, wherein the first uplink spatial filter configuration for receiving the uplink reference signal from the UE is based on a first downlink spatial filter configuration associated with a first downlink reference signal. In some examples, the spatial configuration manager 1040 can send an indication of downlink spatial relationship information, an indication of uplink TCI, or both, wherein the first downlink spatial filter configuration is based on this indication.

[0181] The scheduler 1045 can receive an authorization to schedule downlink data transmission, wherein the spatial filter configuration for the demodulation reference signal to be transmitted along with the downlink data transmission is based on the authorization.

[0182] The frequency offset manager 1050 can identify the difference between the uplink reference signal frequency and the downlink reference signal frequency. In some examples, the frequency offset manager 1050 can identify the receive frequency used for downlink data transmission to the UE based on the difference.

[0183] The coordination manager 1055 can coordinate with the second base station to identify the receive frequency for downlink data transmission to the UE.

[0184] Figure 11 A diagram of a system 1100 including a device 1105 supporting frequency offset pre-compensation based on an uplink reference signal, according to various aspects of this disclosure, is shown. Device 1105 may be an example of device 805, device 905, or base station 105 as described herein, or may include components thereof. Device 1105 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1110, a network communication manager 1115, a transceiver 1120, an antenna 1125, a memory 1130, a processor 1140, and an inter-site communication manager 1145. These components may communicate electronically via one or more buses (e.g., bus 1150).

[0185] The communication manager 1110 can: transmit a first downlink reference signal to the UE using a downlink reference signal frequency; receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with transmission between the UE and a first base station and a second frequency offset associated with transmission between the UE and a second base station; and transmit downlink data transmission to the UE at a receive frequency based on the uplink reference signal frequency for the UE.

[0186] The network communication manager 1115 can manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1115 can manage the transmission of data communication by client devices such as one or more UEs 115.

[0187] Transceiver 1120 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, transceiver 1120 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1120 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.

[0188] In some cases, a wireless device may include a single antenna 1125. However, in other cases, the device may have more than one antenna 1125, which may be able to transmit or receive multiple wireless transmissions simultaneously.

[0189] Memory 1130 may include RAM, ROM, or a combination thereof. Memory 1130 may store computer-readable code 1135 including instructions that, when executed by a processor (e.g., processor 1140), cause the device to perform the various functions described herein. In some cases, memory 1130 may, in particular, contain a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0190] Processor 1140 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 1140 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1140. Processor 1140 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1130) to cause device 1105 to perform various functions (e.g., functions or tasks supporting frequency offset pre-compensation based on uplink reference signals).

[0191] Inter-site communication manager 1145 can manage 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 1145 can 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 1145 may provide an X2 interface within LTE / LTE-A wireless communication network technology to provide communication between base stations 105.

[0192] Code 1135 may include instructions for implementing various aspects of this disclosure, including instructions supporting wireless communication. Code 1135 may be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, code 1135 may not be directly executed by processor 1140, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein.

[0193] Figure 12 A flowchart is shown illustrating a method 1200 for supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure. Operation of method 1200 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1200 can be based on a reference... Figures 4 to 7 The described communication manager is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0194] At 1205, the UE can determine a first frequency offset associated with the transmission between the UE and the first base station based on a first downlink reference signal transmitted from the first base station using the downlink reference signal frequency. The operation at 1205 can be performed according to the method described herein. In some examples, aspects of the operation at 1205 can be determined by, as referenced... Figures 4 to 7 The frequency offset manager described is used to perform this.

[0195] At 1210, the UE can determine a second frequency offset associated with the transmission between the UE and the second base station based on a second downlink reference signal transmitted from the second base station using the downlink reference signal frequency. The operation of 1210 can be performed according to the method described herein. In some examples, aspects of the operation of 1210 can be determined by, as referenced... Figures 4 to 7 The frequency offset manager described is used to perform this.

[0196] At point 1215, the UE can transmit at least one uplink reference signal to the first base station and the second base station using an uplink reference signal frequency based on a first frequency offset and a second frequency offset. The operation of point 1215 can be performed according to the method described herein. In some examples, aspects of the operation of point 1215 can be determined by, as referenced... Figures 4 to 7 The described uplink reference signal manager is used to execute this.

[0197] At 1220, the UE can receive downlink data transmission from either the first or second base station at a receive frequency based on the uplink reference signal frequency. The operation of 1220 can be performed according to the method described herein. In some examples, aspects of the operation of 1220 can be determined by, as referenced... Figures 4 to 7 The described downlink data transmission manager is used to perform this.

[0198] Figure 13 A flowchart is shown illustrating a method 1300 for supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure. Operation of method 1300 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1300 can be based on a reference... Figures 4 to 7 The described communication manager is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0199] At 1305, the UE can determine a first frequency offset associated with the transmission between the UE and the first base station based on a first downlink reference signal transmitted from the first base station using the downlink reference signal frequency. The operation at 1305 can be performed according to the method described herein. In some examples, aspects of the operation at 1305 can be determined by, as referenced... Figures 4 to 7 The frequency offset manager described is used to perform this.

[0200] At 1310, the UE can determine a second frequency offset associated with the transmission between the UE and the second base station based on a second downlink reference signal transmitted from the second base station using the downlink reference signal frequency. The operation of 1310 can be performed according to the method described herein. In some examples, aspects of the operation of 1310 can be determined by, as referenced... Figures 4 to 7 The frequency offset manager described is used to perform this.

[0201] At 1315, the UE can identify the weighting factor to be applied to the first frequency offset, the second frequency offset, or both. The operation of 1315 can be performed according to the method described herein. In some examples, aspects of the operation of 1315 can be derived from, as referenced... Figures 4 to 7 The weighting factor manager described is used to perform this.

[0202] At 1320, the UE can determine the uplink reference signal frequency based on a first frequency offset, a second frequency offset, and a weighting factor. The operation at 1320 can be performed according to the method described herein. In some examples, aspects of the operation at 1320 can be determined by, as in the reference... Figures 4 to 7 The weighting factor manager described is used to perform this.

[0203] At point 1325, the UE can transmit at least one uplink reference signal to the first base station and the second base station using an uplink reference signal frequency based on a first frequency offset and a second frequency offset. The operation at point 1325 can be performed according to the method described herein. In some examples, aspects of the operation at point 1325 can be determined by, as referenced... Figures 4 to 7 The described uplink reference signal manager is used to execute this.

[0204] At 1330, the UE can receive downlink data transmission from the first base station or the second base station at a receive frequency based on the uplink reference signal frequency. The operation of 1330 can be performed according to the method described herein. In some examples, aspects of the operation of 1330 can be determined by, as referenced... Figures 4 to 7 The described downlink data transmission manager is used to perform this.

[0205] Figure 14 A flowchart is shown illustrating a method 1400 for supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure. Operation of method 1400 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1400 can be based on a reference... Figures 4 to 7 The described communication manager is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0206] At 1405, the UE can receive a configuration signal identifying the downlink reference signal frequency. The operation of 1405 can be performed according to the method described herein. In some examples, aspects of the operation of 1405 can be determined by, for example, a reference signal frequency. Figures 4 to 7 The configuration manager described is used to execute this.

[0207] At 1410, the UE can determine a first frequency offset associated with the transmission between the UE and the first base station based on a first downlink reference signal transmitted from the first base station using the downlink reference signal frequency. The operation of 1410 can be performed according to the method described herein. In some examples, aspects of the operation of 1410 can be determined by, as referenced... Figures 4 to 7 The frequency offset manager described is used to perform this.

[0208] At point 1415, the UE can determine a second frequency offset associated with the transmission between the UE and the second base station based on a second downlink reference signal transmitted from the second base station using the downlink reference signal frequency. The operation at point 1415 can be performed according to the method described herein. In some examples, aspects of the operation at point 1415 can be determined by, as referenced... Figures 4 to 7The frequency offset manager described is used to perform this.

[0209] At 1420, the UE can transmit at least one uplink reference signal to the first base station and the second base station using an uplink reference signal frequency based on a first frequency offset and a second frequency offset. The operation at 1420 can be performed according to the method described herein. In some examples, aspects of the operation at 1420 can be determined by, as referenced... Figures 4 to 7 The described uplink reference signal manager is used to execute this.

[0210] At point 1425, the UE can receive downlink data transmission from either the first or second base station at a receive frequency based on the uplink reference signal frequency. The operation at point 1425 can be performed according to the method described herein. In some examples, aspects of the operation at point 1425 can be determined by, as referenced... Figures 4 to 7 The described downlink data transmission manager is used to perform this.

[0211] Figure 15 A flowchart is shown illustrating a method 1500 for supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure. Operation of method 1500 can be implemented by a base station 105 or its components as described herein. For example, operation of method 1500 can be based on a reference... Figures 8 to 11 The described communication manager is used to execute this. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0212] At point 1505, the base station can transmit a first downlink reference signal to the UE using the downlink reference signal frequency. The operation at point 1505 can be performed according to the method described herein. In some examples, aspects of the operation at point 1505 can be determined by, as in the reference... Figures 8 to 11 The downlink reference signal manager described is used to perform this.

[0213] At 1510, the base station can receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with transmission between the UE and the first base station and a second frequency offset associated with transmission between the UE and the second base station. 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, as referenced... Figures 8 to 11 The described uplink reference signal manager is used to execute this.

[0214] At point 1515, the base station can transmit downlink data to the UE at a receive frequency based on the uplink reference signal frequency used by the UE. The operation of point 1515 can be performed according to the method described herein. In some examples, aspects of the operation of point 1515 can be determined by, as referenced... Figures 8 to 11 The described downlink data transmission manager is used to perform this.

[0215] Figure 16 A flowchart is shown illustrating a method 1600 for supporting frequency offset pre-compensation based on an uplink reference signal according to various aspects of this disclosure. Operation of method 1600 can be implemented by a base station 105 or its components as described herein. For example, operation of method 1600 can be performed by a reference... Figures 8 to 11 The described communication manager is used to execute this. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0216] At point 1605, the base station can transmit a first downlink reference signal to the UE using the downlink reference signal frequency. The operation at point 1605 can be performed according to the method described herein. In some examples, aspects of the operation at point 1605 can be determined by, as referenced... Figures 8 to 11 The downlink reference signal manager described is used to perform this.

[0217] At point 1610, the base station can send a trigger message to the UE to trigger transmission of an uplink reference signal using the uplink reference signal frequency. The operation of point 1610 can be performed according to the method described herein. In some examples, aspects of the operation of point 1610 can be determined by, as referenced... Figures 8 to 11 The described uplink reference signal transmission manager is used to perform this.

[0218] At point 1615, the base station can receive at least one uplink reference signal from the UE using an uplink reference signal frequency based on a first frequency offset associated with transmission between the UE and the first base station and a second frequency offset associated with transmission between the UE and the second base station. The operation of point 1615 can be performed according to the method described herein. In some examples, aspects of the operation of point 1615 can be determined by, as referenced... Figures 8 to 11 The described uplink reference signal manager is used to execute this.

[0219] At point 1620, the base station can transmit downlink data to the UE at a receive frequency based on the uplink reference signal frequency used by the UE. The operation of point 1620 can be performed according to the method described herein. In some examples, aspects of the operation of point 1620 can be determined by, as referenced... Figures 8 to 11The described downlink data transmission manager is used to perform this.

[0220] 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 possible. Furthermore, aspects from two or more methods can be combined.

[0221] Aspect 1: A method for wireless communication at a user equipment (UE), comprising: determining a first frequency offset associated with a transmission between the UE and the first base station based at least in part on a first downlink reference signal transmitted from a first base station using a downlink reference signal frequency; determining a second frequency offset associated with a transmission between the UE and the second base station based at least in part on a second downlink reference signal transmitted from a second base station using a downlink reference signal frequency; transmitting at least one uplink reference signal to the first base station and the second base station using an uplink reference signal frequency based at least in part on the first frequency offset and the second frequency offset; and receiving downlink data transmission from the first base station or the second base station at a receiving frequency based at least in part on the uplink reference signal frequency.

[0222] Aspect 2: The method according to aspect 1 further includes: identifying a weighting factor to be applied to the first frequency offset, the second frequency offset, or both; and determining the uplink reference signal frequency based at least in part on the first frequency offset, the second frequency offset, and the weighting factor.

[0223] Aspect 3: The method according to aspect 2 further includes: receiving a configuration signal indicating a weighting factor.

[0224] Aspect 4: The method according to any one of aspects 1 to 3 further includes: receiving a configuration signal that identifies the frequency of a downlink reference signal.

[0225] Aspect 5: The method according to any one of Aspects 1 to 4 further includes: in response to determining the first frequency offset and the second frequency offset, the UE autonomously uses the uplink reference signal frequency to transmit an uplink reference signal.

[0226] Aspect 6: The method according to any one of aspects 1 to 5 further includes: receiving a trigger message that triggers the transmission of an uplink reference signal using the uplink reference signal frequency.

[0227] Aspect 7: The method according to any one of Aspects 1 to 6 further includes: identifying a first uplink spatial filter configuration for transmitting at least one uplink reference signal to a first base station and a second downlink spatial filter configuration associated with a second downlink reference signal; and transmitting the uplink reference signal to the first base station at least in part based on the first uplink spatial filter configuration and to the second base station at least in part based on the second uplink spatial filter configuration.

[0228] Aspect 8: According to the method of aspect 7, the first downlink spatial filter configuration, the second downlink spatial filter configuration, or both are identified at least in part based on the downlink TCI state.

[0229] Aspect 9: According to the method of aspect 7, the first uplink spatial filter configuration is at least partially based on spatial relationship information indication, uplink TCI, or both, and is associated with the first downlink spatial filter configuration and / or the second downlink spatial filter configuration.

[0230] Aspect 10: The method according to any one of Aspects 1 to 9 further includes: receiving an authorization to schedule downlink data transmission; and identifying, at least in part, a spatial filter configuration for a demodulation reference signal to be transmitted together with the downlink data transmission based on the authorization.

[0231] Aspect 11: The method according to any one of Aspects 1 to 10 further includes: determining a weighted average of a first frequency offset and a second frequency offset; and identifying an uplink reference signal frequency based at least in part on the weighted average.

[0232] Aspect 12: A method for wireless communication at a first base station, comprising: transmitting a first downlink reference signal to a UE using a downlink reference signal frequency; receiving at least one uplink reference signal from the UE using an uplink reference signal frequency at least partially based on a first frequency offset associated with a transmission between the UE and the first base station and a second frequency offset associated with a transmission between the UE and a second base station; and transmitting downlink data transmission to the UE at a receiving frequency at least partially based on the uplink reference signal frequency for the UE.

[0233] Aspect 13: The method according to aspect 12 further includes: sending a configuration signal to the UE indicating a weighting factor to be applied to a first frequency offset, a second frequency offset, or both, wherein the UE determines the uplink reference signal frequency at least in part based on the first frequency offset, the second frequency offset, and the weighting factor.

[0234] Aspect 14: The method according to any one of aspects 12 to 13 further includes: transmitting a configuration signal that identifies the downlink reference signal frequency.

[0235] Aspect 15: The method according to any one of Aspects 12 to 14, wherein in response to the UE determining a first frequency offset and a second frequency offset, the UE autonomously uses the uplink reference signal frequency to transmit an uplink reference signal.

[0236] Aspect 16: The method according to any one of aspects 12 to 15 further includes: sending a trigger message to the UE to trigger the transmission of an uplink reference signal using an uplink reference signal frequency.

[0237] Aspect 17: The method according to any one of aspects 12 to 16 further includes: receiving an uplink reference signal from the UE at least in part based on a first uplink spatial filter configuration, wherein the first uplink spatial filter configuration for receiving the uplink reference signal from the UE is at least in part based on a first downlink spatial filter configuration associated with the first downlink reference signal.

[0238] Aspect 18: The method according to aspect 17 further includes: sending an indication of downlink spatial relationship information, an indication of uplink TCI, or both, wherein the configuration of the first downlink spatial filter is at least partially based on the indication.

[0239] Aspect 19: The method according to any one of aspects 12 to 18 further includes: receiving an authorization to schedule downlink data transmission, wherein the spatial filter configuration for the demodulation reference signal transmitted together with the downlink data transmission is at least partially based on the authorization.

[0240] Aspect 20: The method according to any one of aspects 12 to 19 further includes: identifying a receiving frequency based at least in part on a weighted average of a first frequency offset and a second frequency offset, wherein the receiving frequency is based at least in part on the weighted average.

[0241] Aspect 21: The method according to any one of Aspects 12 to 20 further includes: identifying the difference between the uplink reference signal frequency and the downlink reference signal frequency; and identifying the receiving frequency for downlink data transmission to the UE based at least in part on the difference.

[0242] Aspect 22: The method according to any one of aspects 12 to 21 further includes: coordinating with a second base station to identify a receiving frequency for downlink data transmission to the UE.

[0243] Aspect 23: An apparatus comprising at least one component for performing the method according to any one of aspects 1 to 11.

[0244] Aspect 24: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to any one of aspects 1 to 11.

[0245] Aspect 25: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method according to any one of aspects 1 to 11.

[0246] Aspect 26: An apparatus comprising at least one component for performing the method according to any one of aspects 12 to 22.

[0247] Aspect 27: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to any one of aspects 12 to 22.

[0248] Aspect 28: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform a method according to any one of aspects 12 to 22.

[0249] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems have been described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR are used extensively in the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described 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.

[0250] The information and signals described herein can be represented using any of a variety of different techniques and skills. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout this specification can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0251] The various illustrative boxes and modules described in connection with the disclosure 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 component, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, 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 combined with a DSP core, or any other such configuration).

[0252] The functionality described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functionality can be stored as one or more instructions or code on or transmitted through a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functionality described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functionality can also be physically located in various locations, including being distributed such that different parts of the functionality are implemented at different physical locations.

[0253] Computer-readable media include both non-transitory computer storage media and communication media. Communication media includes any medium that facilitates the transfer of a computer program from one place to another. Non-transitory storage media can be any available medium that can be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable read-only memory (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code components in the form of instructions or data structures, and that can be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, these are all included in the definition of computer-readable media. The disks and optical discs used in this article include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically, while optical discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0254] As used herein (including in the claims), the word "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of..." or "one or more of...") indicates an inclusive list, such that a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an exemplary 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".

[0255] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by adding a dash and a second reference numeral to differentiate similar components after the reference numeral. If only the first reference numeral is used in the specification, the description applies to any of the similar components having the same first reference numeral, without considering the second or other subsequent reference numerals.

[0256] The description herein, illustrated with reference to the accompanying drawings, describes an example configuration and does not represent all possible examples or all examples within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "superior to other examples." The detailed description includes specific details intended to provide an understanding of the techniques described. However, these techniques can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concept of the described examples.

[0257] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: Receive a configuration signal indicating a weighting factor to be applied to a first frequency offset, a second frequency offset, or both, wherein the first frequency offset is associated with transmissions between the UE and a first network entity, and the second frequency offset is associated with transmissions between the UE and a second network entity; The first frequency offset is determined at least in part based on a first downlink reference signal transmitted from the first network entity using the downlink reference signal frequency; The second frequency offset is determined at least in part based on a second downlink reference signal transmitted from the second network entity using the downlink reference signal frequency; At least one uplink reference signal is transmitted to the first network entity and the second network entity using an uplink reference signal frequency based at least in part on the first frequency offset, the second frequency offset, and the weighting factor; as well as Downlink data transmission is received from the first network entity or the second network entity at a reception frequency at least in part based on the uplink reference signal frequency.

2. The method according to claim 1, further comprising: Receive a configuration signal that identifies the frequency of the downlink reference signal.

3. The method according to claim 1, further comprising: In response to determining the first frequency offset and the second frequency offset, the UE autonomously uses the uplink reference signal frequency to transmit the uplink reference signal.

4. The method according to claim 1, further comprising: Receive a trigger message that triggers the transmission of the uplink reference signal using the frequency of the uplink reference signal.

5. The method according to claim 1, further comprising: The first uplink spatial filter configuration for transmitting the at least one uplink reference signal to the first network entity is identified at least in part based on the first downlink spatial filter configuration associated with the first downlink reference signal and the second downlink spatial filter configuration associated with the second downlink reference signal; as well as The uplink reference signal is transmitted to the first network entity, the second network entity, or both, at least in part based on the first uplink spatial filter configuration.

6. The method of claim 5, wherein the first downlink spatial filter configuration, the second downlink spatial filter configuration, or both are identified at least in part based on a downlink transport configuration indicator (TCI).

7. The method of claim 5, wherein the first uplink spatial filter configuration is associated with the first downlink spatial filter configuration and the second downlink spatial filter configuration at least in part with a spatial relation information indication, an uplink transmission configuration indicator (TCI), or both.

8. The method according to claim 1, further comprising: Receive authorization to schedule the downlink data transmission; as well as At least in part, the authorization is used to identify the spatial filter configuration for the demodulation reference signal transmitted along with the downlink data transmission.

9. The method according to claim 1, further comprising: Determine the weighted average of the first frequency offset and the second frequency offset; as well as The uplink reference signal frequency is identified at least in part based on the weighted average value.

10. A method for wireless communication at a first network entity, comprising: The first downlink reference signal is transmitted to the user equipment (UE) using the downlink reference signal frequency; Send a configuration signal to the UE indicating a weighting factor to be applied to a first frequency offset, a second frequency offset, or both, wherein the first frequency offset is associated with transmissions between the UE and the first network entity, and the second frequency offset is associated with transmissions between the UE and the second network entity; The UE receives at least one uplink reference signal using an uplink reference signal frequency based at least in part on the first frequency offset, the second frequency offset, and the weighting factor. as well as Downlink data transmission is sent to the UE at a receiving frequency at least in part based on the uplink reference signal frequency.

11. The method of claim 10, further comprising: Send a configuration signal that identifies the frequency of the downlink reference signal.

12. The method of claim 10, wherein in response to the UE determining the first frequency offset and the second frequency offset, the UE autonomously uses the uplink reference signal frequency to transmit the uplink reference signal.

13. The method of claim 10, further comprising: Send a trigger message to the UE to trigger the transmission of the uplink reference signal using the uplink reference signal frequency.

14. An apparatus for 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 a configuration signal indicating a weighting factor to be applied to a first frequency offset, a second frequency offset, or both, wherein the first frequency offset is associated with transmissions between the UE and a first network entity, and the second frequency offset is associated with transmissions between the UE and a second network entity; The first frequency offset is determined at least in part based on a first downlink reference signal transmitted from the first network entity using the downlink reference signal frequency; The second frequency offset is determined at least in part based on a second downlink reference signal transmitted from the second network entity using the downlink reference signal frequency; At least one uplink reference signal is transmitted to the first network entity and the second network entity using an uplink reference signal frequency based at least in part on the first frequency offset, the second frequency offset, and the weighting factor; as well as Downlink data transmission is received from the first network entity or the second network entity at a reception frequency at least in part based on the uplink reference signal frequency.

15. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: Receive a configuration signal that identifies the frequency of the downlink reference signal.

16. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: In response to determining the first frequency offset and the second frequency offset, the UE autonomously uses the uplink reference signal frequency to transmit the uplink reference signal.

17. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: Receive a trigger message that triggers the transmission of the uplink reference signal using the frequency of the uplink reference signal.

18. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: The first uplink spatial filter configuration for transmitting the at least one uplink reference signal to the first network entity is identified at least in part based on a first downlink spatial filter configuration associated with the first downlink reference signal and a second downlink spatial filter configuration associated with the second downlink reference signal; and The uplink reference signal is transmitted to the first network entity, the second network entity, or both, at least in part based on the first uplink spatial filter configuration.

19. The apparatus of claim 18, wherein the first downlink spatial filter configuration, the second downlink spatial filter configuration, or both are identified at least in part based on a downlink transport configuration indicator (TCI).

20. The apparatus of claim 18, wherein the first uplink spatial filter configuration is associated with the first downlink spatial filter configuration and the second downlink spatial filter configuration at least in part with a spatial relation information indication, an uplink transmission configuration indicator (TCI), or both.

21. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: Receive authorization to schedule the downlink data transmission; and At least in part, the authorization is used to identify the spatial filter configuration for the demodulation reference signal transmitted along with the downlink data transmission.

22. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: Determine the weighted average of the first frequency offset and the second frequency offset; and The uplink reference signal frequency is identified at least in part based on the weighted average value.

23. An apparatus for wireless communication at a first network entity, 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 first downlink reference signal is transmitted to the user equipment (UE) using the downlink reference signal frequency; Send a configuration signal to the UE indicating a weighting factor to be applied to a first frequency offset, a second frequency offset, or both, wherein the first frequency offset is associated with transmissions between the UE and the first network entity, and the second frequency offset is associated with transmissions between the UE and the second network entity; The UE receives at least one uplink reference signal using an uplink reference signal frequency based at least in part on the first frequency offset, the second frequency offset, and the weighting factor. as well as Downlink data transmission is sent to the UE at a receiving frequency at least in part based on the uplink reference signal frequency.

24. The apparatus of claim 23, wherein the instructions are further executable by the processor to cause the apparatus to: Send a configuration signal that identifies the frequency of the downlink reference signal.

25. An apparatus for wireless communication, comprising components for performing a method of wireless communication according to any one of claims 1-13.

26. A computer-readable medium having one or more computer instructions recorded thereon, which, when executed by one or more processors, cause the one or more processors to perform a method of wireless communication according to any one of claims 1-13.

27. A computer program product comprising one or more computer instructions, which, when executed by one or more processors, cause the one or more processors to perform a method of wireless communication according to any one of claims 1-13.

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