Tracking reference signal configuration for single frequency network communications

Abstract

A method, system, and device for wireless communication are described. A user equipment (UE) may receive a control message indicating a resource set or resource configuration including one or more resources for two or more time resources for reference signal reception from at least two transmission / reception points (TRPs) according to a single frequency network (SFN) configuration. The UE may receive a first reference signal from a first TRP and a second reference from a second TRP in the indicated resources. The UE may perform channel estimation for the SFN channels associated with the at least two TRPs according to the control message. The channel estimation may be based on the first and second reference signals. The UE may communicate with at least one of the first TRP and the second TRP according to the channel estimation.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001]

[0001] This patent application claims the benefit of U.S. patent application Ser. No. 17 / 481,062 by Venugopal et al., entitled "TRACKING REFERENCE SIGNAL CONFIGURATION FOR SINGLE FREQUENCY NETWORK COMMUNICATIONS," filed Sep. 21, 2021, and assigned to the assignee of this application. [Technical field]

[0002] introduction FIELD OF THE DISCLOSURE

[0002] The following relates generally to wireless communications, and more specifically to single frequency network (SFN) communications. [Background technology]

[0003]

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasts, and the like. These systems may be capable of supporting 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-Advanced (LTE-A), or LTE-A Pro systems, and fifth generation (5G) systems, sometimes referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM), etc. A wireless multiple-access communication system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may sometimes be known as User Equipment (UE). Summary of the Invention

[0004] A method for wireless communication in a UE is described. The method can include transmitting a UE capability message indicating support of an SFN configuration, and receiving a control message based on the UE capability message. In some embodiments, the control message can indicate a resource set including one or more resources for reference signal reception from at least two transmission / reception points (TRPs) according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the method can include performing channel estimation for an SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources, and communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0005]

[0005] An apparatus for wireless communication in a UE is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to transmit a UE capability message indicating support of an SFN configuration and to receive a control message based on the UE capability message. In some embodiments, the control message may indicate a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the processor and the memory may be configured to perform channel estimation for an SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources, and to communicate with at least one of the first TRP or the second TRP according to the channel estimation.

[0006] Another apparatus for wireless communication in a UE is described. The apparatus may include means for transmitting a UE capability message indicating support of an SFN configuration, and means for receiving a control message based on the UE capability message. In some embodiments, the control message may indicate a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the apparatus may include means for performing channel estimation for an SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources, and means for communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0007]

[0007] A non-transitory computer-readable medium storing code for wireless communication in a UE is described. The code may include instructions executable by a processor to send a UE capability message indicating support of an SFN configuration and to receive a control message based on the UE capability message. In some embodiments, the control message may indicate a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the code may include instructions executable by a processor to perform channel estimation for an SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources, and to communicate with at least one of the first TRP or the second TRP according to the channel estimation.

[0008] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a first reference signal and a second reference signal at one or more resources. In some embodiments, the one or more resources may include a first time resource associated with a first TRP and a second time resource associated with a second TRP, and the first time resource and the second time resource may overlap in the time domain.

[0009] Some embodiments of the methods, devices, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a first reference signal in a first time resource and a first resource element, the first reference signal being scrambled according to a first scrambling sequence associated with a first identifier (ID) of the first TRP. Some embodiments of the methods, devices, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a second reference signal in a second time resource and a first resource element, the second reference signal being scrambled according to a second scrambling sequence associated with a second ID of the second TRP.

[0010] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a first reference signal in a first time resource and a first resource element, and receiving a second reference signal in a second time resource and a second resource element that may not overlap with the first resource element in the frequency domain. In some embodiments, the first reference signal and the second reference signal may be transmitted according to a frequency division multiplexing (FDM) configuration or a spatial division multiplexing (SDM) configuration.

[0011] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, the resource set may include a first resource set associated with the first TRP and a second resource set associated with the second TRP, and the methods, apparatus, and non-transitory computer-readable media may include further operations, features, means, or instructions for performing channel estimation for the SFN channel based on the first reference signal being received over the first resource set. In some embodiments, the second reference signal may be received over the second resource set, and the first resource set may correspond to the same periodicity, the same offset, or both, as the second resource set.

[0012] In some embodiments of the methods, devices, and non-transitory computer-readable media described herein, the resource set may include a first resource set associated with the first TRP and a second resource set associated with the second TRP, and the methods, devices, and non-transitory computer-readable media may further include an operation, feature, means, or instruction for receiving a first downlink control channel that schedules a first reference signal over the first resource set and a second downlink control channel that schedules a second reference signal over the second resource set. Some embodiments of the methods, devices, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for performing channel estimation for the SFN channel based on the first reference signal being received in a first time resource of the first resource set and the second reference signal being received in a second time resource of the second resource set that may overlap with the first time resource in the time domain.

[0013]

[0013] In some embodiments of the methods, devices, and non-transitory computer-readable media described in this specification, the UE capability message includes a field configured to indicate the UE capability of receiving reference signals from at least two TRPs in the same time resource according to the SFN configuration.

[0014]

[0014] In some embodiments of the methods, devices, and non-transitory computer-readable media described in this specification, the UE capability message includes one or more fields different from this field, where the one or more fields indicate support for a multi-TRP communication configuration over a downlink control channel or a downlink shared channel.

[0015] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a first reference signal over a first symbol and a first resource element and receiving a second reference signal over the first symbol and a second resource element, where the one or more resources include the first symbol, the first resource element, and the second resource element. Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for transmitting a UE capability message indicating support for the SFN configuration based on a frequency offset between the first resource element and the second resource element.

[0016] A method for wireless communication in a UE is described. The method can include receiving a control message indicating a resource configuration for two or more time resources associated with receiving reference signals from at least two TRPs according to an SFN configuration, and receiving a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. In some embodiments, the method can include performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. In some embodiments, the method can include communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0017]

[0017] An apparatus for wireless communication in a UE is described. The apparatus may include a processor and a memory coupled to the processor. The processor and memory may be configured to receive a control message indicating a resource configuration for two or more time resources associated with reference signal reception from at least two TRPs according to an SFN configuration, and receive a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. In some embodiments, the processor and memory may be configured to perform channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. In some embodiments, the processor and memory may be configured to communicate with at least one of the first TRP or the second TRP according to the channel estimation.

[0018] Another apparatus for wireless communication in a UE is described. The apparatus may include means for receiving a control message indicating a resource configuration for two or more time resources associated with receiving reference signals from at least two TRPs according to an SFN configuration, and means for receiving a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. In some embodiments, the apparatus may include means for performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. In some embodiments, the apparatus may include means for communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0019] A non-transitory computer-readable medium storing code for wireless communication in a UE is described. The code may include instructions executable by a processor to receive a control message indicating a resource configuration for two or more time resources associated with receiving reference signals from at least two TRPs according to an SFN configuration, receive a first reference signal from a first TRP of the at least two TRPs and receive a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. In some embodiments, the code may include instructions executable by a processor to perform channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. In some embodiments, the code may include instructions executable by a processor to communicate with at least one of the first TRP or the second TRP according to the channel estimation.

[0020] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, the control message may indicate a window associated with two or more time resources, and the methods, apparatus, and non-transitory computer-readable media may include a further operation, feature, means, or instruction for performing channel estimation for the SFN channel based on the two or more time resources being located within the window. In some embodiments, the two or more time resources may include a first time resource associated with a first TRP and a second time resource associated with a second TRP.

[0021] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, the control message indicates a starting boundary of a window for a position of two or more time resources in the time domain.

[0022]

[0022] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described in this specification may further include an operation, feature, means, or instruction for receiving a control message via a downlink control channel, the control message indicating a starting boundary of a window for the last symbol of the downlink control channel in the time domain.

[0023] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for maintaining a first receiver chain associated with a first TRP and a second receiver chain associated with a second TRP. In some embodiments, the first receiver chain may correspond to a first refresh interval, and the second receiver chain may correspond to a second refresh interval, and the duration of the window may be less than the duration of the first refresh interval and the duration of the second refresh interval.

[0024] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an act, feature, means, or instruction for performing beam switching during a beam switching duration between receiving the first reference signal and receiving the second reference signal. In some embodiments, the duration of the window may be longer than the beam switching duration.

[0025] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, a window includes one or more resource sets associated with two or more time resources. In some embodiments, the one or more resource sets can be based on a control message, a periodicity of the two or more time resources, an offset, a capability of the UE, or any combination thereof.

[0026]

[0026] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described in this specification may further include an operation, feature, means, or instruction of receiving a radio resource control (RRC) signal indicating a configuration for the window.

[0027] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, the resource configuration indicates a resource set including a first subset of resources associated with a first TRP and a second subset of resources associated with a second TRP. In some embodiments, the control message can indicate joint tracking between the first subset of resources and the second subset of resources.

[0028] Some embodiments of the methods, devices, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a second control message indicating separate tracking between the first subset of resources and the second subset of resources. Some embodiments of the methods, devices, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for performing a first channel estimation for a first channel associated with the first TRP according to the second control message and performing a second channel estimation for a second channel associated with the second TRP according to the second control message.

[0029]

[0029] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described in this specification may further include an operation, feature, means, or instruction of receiving a control signal indicating a pairing between a first resource set associated with a first TRP and a second resource set associated with a second TRP, and performing channel estimation for the SFN channel based on the control signal.

[0030] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a first reference signal over a first time resource of the two or more time resources and receiving a second reference signal over a second time resource of the two or more time resources, the second time resource being non-overlapping with the first time resource. In some embodiments, the first reference signal and the second reference signal may be transmitted according to a time division multiplexing (TDM) configuration.

[0031] A method of wireless communication in a network node including at least two TRPs is described. The method can include receiving a UE capability message from a UE indicating support of a SFN configuration, and transmitting a control message to the UE based on the UE capability message. In some embodiments, the control message can indicate a resource set including one or more resources for reference signal transmission from the at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the method can include transmitting a first reference signal of the first TRP and a second reference signal of the second TRP to the UE on the one or more resources, and communicating with the UE using at least one of the first TRP and the second TRP according to a SFN channel associated with the at least two TRPs.

[0032]

[0032] An apparatus for wireless communication in a network node including at least two TRPs is described. The apparatus may include a processor and a memory coupled to the processor. The processor and memory may be configured to receive a UE capability message from a UE indicating support of an SFN configuration, and to transmit a control message to the UE based on the UE capability message. In some embodiments, the control message may indicate a resource set including one or more resources for reference signal transmission from the at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the processor and memory may be configured to transmit a first reference signal of the first TRP and a second reference signal of the second TRP to the UE in one or more resources, and communicate with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0033] Another apparatus for wireless communication in a network node including at least two TRPs is described. The apparatus may include means for receiving a UE capability message indicating support of an SFN configuration from a UE, and means for transmitting a control message to the UE based on the UE capability message. In some embodiments, the control message may indicate a resource set including one or more resources for reference signal transmission from the at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the apparatus may include means for transmitting a first reference signal of the first TRP and a second reference signal of the second TRP to the UE in one or more resources, and means for communicating with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0034]

[0034] A non-transitory computer-readable medium storing code for wireless communication in a network node including at least two TRPs is described. The code may include instructions executable by a processor to receive from a UE a UE capability message indicating support of an SFN configuration and to transmit to the UE a control message based on the UE capability message. In some embodiments, the control message may indicate a resource set including one or more resources for reference signal transmission from the at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. In some embodiments, the code may include instructions executable by a processor to transmit to the UE a first reference signal of the first TRP and a second reference signal of the second TRP in one or more resources and to communicate with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0035] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for transmitting a first reference signal and a second reference signal to the UE in one or more resources. In some embodiments, the one or more resources may include a first time resource associated with a first TRP and a second time resource associated with a second TRP, and the first time resource and the second time resource may overlap in the time domain.

[0036] Some embodiments of the methods, apparatuses, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for transmitting a first reference signal in a first time resource and a first resource element, the first reference signal being scrambled according to a first scrambling sequence associated with a first TRP, and transmitting a second reference signal in a second time resource and a first resource element, the second reference signal being scrambled according to a second scrambling sequence associated with a second TRP. In some embodiments, the first time resource and the second time resource may correspond to the same symbol.

[0037] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for transmitting a first reference signal in a first time resource and a first resource element, and transmitting a second reference signal in a second time resource and a second resource element that may not overlap with the first resource element in the frequency domain. In some embodiments, the first time resource and the second time resource may correspond to the same symbol, and the first reference signal and the second reference signal may be transmitted according to an FDM configuration or an SDM configuration.

[0038] A method of wireless communication in a network node including at least two TRPs is described. The method may include transmitting, to a UE, a control message indicating a resource configuration for two or more time resources associated with reference signal transmission for the at least two TRPs according to a SFN configuration, and transmitting, to the UE via the two or more time resources, a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration. In some embodiments, the method may include communicating with the UE using at least one of the first TRP and the second TRP according to the SFN configuration.

[0039]

[0039] An apparatus for wireless communication in a network node including at least two TRPs is described. The apparatus may include a processor and a memory coupled to the processor. The processor and memory may be configured to transmit a control message to a UE indicating a resource configuration for two or more time resources associated with a reference signal transmission for the at least two TRPs according to a SFN configuration, and transmit a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration to the UE via the two or more time resources. In some embodiments, the processor and memory may be configured to communicate with the UE using at least one of the first TRP and the second TRP according to the SFN configuration.

[0040] Another apparatus for wireless communication in a network node including at least two TRPs is described. The apparatus may include means for transmitting, to a UE, a control message indicating a resource configuration for two or more time resources associated with a reference signal transmission for the at least two TRPs according to a SFN configuration, and means for transmitting, to the UE via the two or more time resources, a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration. In some embodiments, the apparatus may include means for communicating with the UE using at least one of the first TRP and the second TRP according to the SFN configuration.

[0041] A non-transitory computer-readable medium storing code for wireless communication in a network node including at least two TRPs is described. The code may include instructions executable by a processor to transmit to a UE a control message indicating a resource configuration for two or more time resources associated with reference signal transmission for the at least two TRPs according to a SFN configuration, and to transmit a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration to the UE via the two or more time resources. In some embodiments, the code may include instructions executable by a processor to communicate with the UE using at least one of the first TRP and the second TRP according to the SFN configuration.

[0042] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, the control message indicates a window associated with two or more time resources.

[0043] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, the control message indicates a starting boundary of a window for a position of two or more time resources in the time domain.

[0044]

[0044] Some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein may further include an act, feature, means, or instruction for transmitting a control message over a downlink control channel. In some embodiments, the control message may indicate a starting boundary of a window for the last symbol of the downlink control channel in the time domain.

[0045]

[0045] In some embodiments of the methods, apparatus, and non-transitory computer-readable media described herein, the duration of the window may be longer than a beam switching duration associated with the beam switching performed by the UE. [Brief description of the drawings]

[0046] [Figure 1] 1 illustrates an example of a wireless communication system that supports a tracking reference signal (TRS) configuration for SFN communications in accordance with one or more aspects of the present disclosure. [Diagram 2]

[0047] 1 illustrates an example of a wireless communication system that supports a TRS configuration for a SFN communication system, in accordance with one or more aspects of the present disclosure. [Figure 3A]

[0048] 1 illustrates an example of a communication scheme diagram supporting a TRS configuration for SFN communication in accordance with one or more aspects of the present disclosure. [Figure 3B] 1 illustrates an example of a communication scheme diagram supporting a TRS configuration for SFN communication in accordance with one or more aspects of the present disclosure. [Figure 4]

[0049] 1 illustrates an example of a resource diagram supporting a TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Diagram 5]

[0050] 1 illustrates an example of a resource diagram supporting a TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 6]

[0051] 1 illustrates an example of a process flow for supporting TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 7]

[0052] 1 illustrates an example of a process flow for supporting TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 8]

[0053] 1 illustrates a block diagram of a device that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 9] 1 illustrates a block diagram of a device that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 10]

[0054] 1 illustrates a block diagram of a communications manager that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 11]

[0055] FIG. 1 illustrates a diagram of a system including a device that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 12]

[0056] 1 illustrates a block diagram of a device that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 13] 1 illustrates a block diagram of a device that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 14]

[0057] 1 illustrates a block diagram of a communications manager that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 15]

[0058] FIG. 1 illustrates a diagram of a system including a device that supports TRS configuration for SFN communications, in accordance with one or more aspects of the present disclosure. [Figure 16]

[0059] 1 illustrates a flowchart illustrating a method for supporting TRS configuration for SFN communications, according to one or more aspects of the present disclosure. [Figure 17] 1 illustrates a flowchart illustrating a method for supporting TRS configuration for SFN communications, according to one or more aspects of the present disclosure. [Figure 18] 1 illustrates a flowchart illustrating a method for supporting TRS configuration for SFN communications, according to one or more aspects of the present disclosure. [Figure 19] 1 illustrates a flowchart illustrating a method for supporting TRS configuration for SFN communications, according to one or more aspects of the present disclosure. [Figure 20] 1 illustrates a flowchart illustrating a method for supporting TRS configuration for SFN communications, according to one or more aspects of the present disclosure. [Figure 21] 1 illustrates a flowchart illustrating a method for supporting TRS configuration for SFN communications, according to one or more aspects of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047]

[0060] A wireless communication system may include communication devices such as base stations (e.g., eNodeB (eNB), next generation NodeB, or giga-NodeB (any of which may be referred to as gNB), or some other base station) or UEs that may support multiple radio access technologies. Examples of radio access technologies include 4G systems, such as LTE systems, and 5G systems, which may be referred to as NR systems. In some systems, a UE may communicate with a network via a network node, which may be an example of a control node, a base station, a TRP, or some other network entity. A network node may include or communicate with one or more access network transmission entities that are used for communication with UEs or other devices, such as a TRP (which may also be referred to as a radio head). A network node may transmit or relay data or control signaling to one or more UEs via a TRP, which may be included in or communicate with the network node. A network node may communicate with a UE according to a multi-TRP configuration, a SFN configuration, or a non-SFN configuration. In a multi-TRP configuration, a network node may transmit signals to a UE via multiple TRPs. In a non-SFN configuration, a network node may communicate with a UE using one or more TRPs. Signals communicated according to a multi-TRP or non-SFN configuration may each contain different information and may not be synchronized in time or frequency.

[0048]

[0061] In some embodiments, to improve communication reliability, a wireless communication system may support an SFN configuration in which one or more TRPs of a network may transmit the same signal to a UE in a synchronized manner (e.g., in the same time resource, frequency resource, or both). In an SFN configuration, each TRP may transmit a reference signal (e.g., TRS, channel state information reference signal (CSI-RS), etc.) to the UE via a respective channel. The UE may measure a channel (e.g., for time or frequency tracking) between the UE and each TRP based on the respective reference signal. The UE may estimate an SFN channel (sometimes referred to as a joint SFN channel or a combined SFN channel) including a combination of each channel between the UE and each TRP communicating with the UE. The UE may estimate the combined SFN channel based on each channel measurement performed by the UE. However, in some cases, reference signals from multiple TRPs in an SFN configuration may be synchronized in time but transmitted in different frequency resources, or may be synchronized in frequency but transmitted in different time resources. In such cases, the UE may not be able to accurately measure the combined SFN channel based on the separate reference signals. Additionally or alternatively, in some cases, signaling may not be defined to indicate to the UE which reference signal or channel to use to measure the SFN channel, which may result in ambiguity or reduced reliability associated with SFN communications.

[0049]

[0062] A network node as described herein may transmit to a UE an indication of a resource configuration for reference signal transmission from two or more TRPs of the network node according to a SFN configuration. The resource configuration may be referred to in some embodiments as a TRS configuration for SFN communication. In some embodiments, the reference signal transmission may include a TRS transmission (e.g., a reference signal used for time and frequency tracking of a device such as a UE), a CSI-RS transmission, or both. The resource configuration may indicate a pairing between reference signals (e.g., TRS, CSI-RS), resources, or both associated with different TRPs of the network node. The UE may determine which reference signal to use to estimate a combined SFN channel associated with two or more TRPs based on the resource configuration. In some embodiments, the UE may transmit a UE capability message to indicate the UE's capability of receiving reference signals from different TRPs in the same time resource, such as a symbol, and the network node may transmit a control message to configure a resource set for reception of reference signals from two or more TRPs based on the UE capability message. When the UE receives a first reference signal and a second reference signal from the first and second TRPs, respectively, in a resource set, the UE can track the reference signals together to perform channel estimation for the combined SFN channel.

[0050]

[0063] Additionally or alternatively, the network node may transmit a control message indicating two or more time resources associated with reference signals, such as TRS or CSI-RS, received from different TRPs. The control message may indicate a relationship or window associated with the two or more resources. The UE may receive a first reference signal from a first TRP and a second reference signal from a second TRP in the two or more time resources. If the time resources are within the indicated window or are related according to the indicated relationship, the UE may track the first and second reference signals together (e.g., to estimate a combined SFN channel associated with the first and second TRPs). In some embodiments, the relationship may correspond to a relationship between resources in the same resource set or an indication of two or more resource sets related to SFN communication. The UE may estimate the combined SFN channel based on tracking the first and second reference signals.

[0051]

[0064] Thereby, the network node may transmit a configuration for reference signal reception according to SFN communication. The configuration may indicate some other relationship between resources associated with the SFN channel, such as a resource set, pairing between resources, or a window. The UE may decide to jointly track reference signals received via the indicated resources to perform channel estimation for the SFN channel based on the reference signals. Thus, the configuration may improve communication reliability and coordination between the UE and one or more TRPs of the network node. By indicating which resources may be paired for SFN communication, the configuration may allow the UE to refrain from jointly tracking multiple reference signals, which may reduce UE complexity and processing by the UE. The indicated relationship between resources may improve the SFN channel estimation performed by the UE in some embodiments, which in turn may improve efficiency and communication reliability. Additionally or alternatively, the network node may refrain from dynamically signaling a reconfiguration for tracking the SFN, which may reduce overhead and latency.

[0052]

[0065] Aspects of the present disclosure are initially described in the context of a wireless communication system. Additional aspects are described with reference to communication scheme diagrams, resource timelines, and process flows. Aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts relating to TRS configuration for SFN communication.

[0053]

[0066] 1 illustrates an example of a wireless communication system 100 supporting a TRS configuration for a SFN communication system in accordance with one or more aspects of the present disclosure. The wireless communication system 100 may include one or more network nodes 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be an LTE network, an LTE-A network, an LTE-A Pro network, or an NR network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0054]

[0067] The network nodes 105 may be distributed throughout a geographic area and may be devices of different forms or with different capabilities to form the wireless communication system 100. The network nodes 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each network node 105 may provide a coverage area 110 within which the UEs 115 and the network nodes 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area within which the network nodes 105 and the UEs 115 may support communication of signals via one or more radio access technologies.

[0055]

[0068] The UEs 115 may be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be fixed or mobile or both at different times. The UEs 115 may be devices of different forms or with different capabilities. Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, network nodes 105 (e.g., base stations, control nodes, or some other network nodes), or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), as shown in FIG. 1.

[0056]

[0069] The network nodes 105 may communicate with the core network 130, with each other, or both. For example, the network nodes 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface). The network nodes 105 may communicate with each other via the backhaul links 120 (e.g., via an X2, Xn, or other interface), either directly (e.g., directly between the network nodes 105), or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be or include one or more wireless links. The UE 115 may communicate with the core network 130 through a communication link 155.

[0057]

[0070] One or more of the network nodes 105 described herein may include or may be referred to by those skilled in the art as a base station, base transceiver station, 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 terminology. The network node 105 may include or be associated with a set of TRPs 180. One or more of the network nodes 105 may include a communications manager 102 configured to transmit signals to the UE 115 and communicate with the UE using one or more of the set of TRPs 180.

[0058]

[0071] The UE 115 may include or be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or any other suitable terminology, and a "device" may be referred to as a unit, a station, a terminal, or a client, among various examples. The UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, the UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among various examples, which may be implemented in various items, such as an appliance, or a vehicle, a meter, among various examples. In some implementations, the UE 115 may be or include a non-aggregated UE 115 in which one or more of the various functions and communication layers of the UE 115 may be split among multiple physical devices for communication between the UE 115 and the network node 105. In such cases, the non-aggregated UE 115 may include respective physical devices configured to perform various functions and communications, e.g., to perform one or more of the signaling and TRS configurations for SFN communications described herein.

[0059]

[0072] The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115 that may act as relays, as well as network nodes 105 and network equipment, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among various examples, as shown in Figure 1. The UEs 115 may each include a communications manager 101 that can receive one or more signals and communicate with one or more TRPs 180 of a set of TRPs 180 associated with the network nodes 105.

[0060]

[0073] The UE 115 and the network node 105 may wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for the communication links 125 may include a portion (e.g., a bandwidth part (BWP)) of a radio frequency 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 collection signaling (e.g., synchronization signals, system information), control signaling to coordinate operation on the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) component carriers.

[0061]

[0074] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have collection or control signaling to coordinate operation with respect to other carriers. A carrier may be associated with a frequency channel (e.g., evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be arranged according to a channel raster for discovery by the UE 115. A carrier may operate in a standalone mode, where initial collection and connection may be made by the UE 115 over the carrier, or the carrier may operate in a non-standalone mode, where a connection is anchored using a different carrier (e.g., of the same or different radio access technology).

[0062]

[0075] The communication links 125 shown in the wireless communication system 100 may include uplink transmissions from the UE 115 to the network node 105 or downlink transmissions from the network node 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry downlink and uplink communications (e.g., in TDD mode).

[0063]

[0076] A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several determined bandwidths for a particular radio access technology carrier (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 Megahertz (MHz)). The devices of the wireless communication system 100 (e.g., the network node 105, the UE 115, or both) may have a hardware configuration that supports communication on a particular carrier bandwidth or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a network node 105 or a UE 115 that supports simultaneous communication over a carrier associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate over a portion (e.g., a sub-band, BWP) or all of the carrier bandwidth.

[0064]

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

[0065]

[0078] One or more numerologies for a carrier may be supported, and a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some embodiments, a single BWP for a carrier may be active at a given time, and communication for the UE 115 may be limited to one or more active BWPs.

[0066]

[0079] The time interval for the network node 105 or the UE 115 is, for example, T s =1 / (Δf max N f) seconds, and may be expressed in multiples of a base time unit, where Δf max may represent the maximum supported subcarrier spacing, and N f may represent the maximum supported discrete Fourier transform (DFT) size. The communication resource time intervals may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (e.g., in the range of 0 to 1023).

[0067]

[0080] Each frame may include multiple consecutively numbered subframes or slots, and each subframe or 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 several slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on the subcarrier spacing. Each slot may include several symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). In some wireless communications systems 100, a slot may be further divided into multiple minislots that include one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0068]

[0081] A subframe, slot, minislot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., among a burst of shortened TTIs (sTTIs)).

[0069]

[0082] The physical channels may be multiplexed on the carriers according to various techniques. The physical control channels and the physical data channels may be multiplexed on the downlink carriers using, for example, one or more of TDM, FDM, or hybrid TDM-FDM techniques. A control region (e.g., control resource set (CORESET)) for the physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESET) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search the control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels configured in a cascaded manner. The aggregation level for the control channel candidates may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for sending control information to multiple UEs 115 and a UE-specific search space set for sending control information to a particular UE 115 .

[0070]

[0083] Each network node 105 may provide communication coverage via one or more cells, e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof. The term "cell" may refer to a logical communication entity used for communication with the network node 105 (e.g., on a carrier) and may be associated with an identifier (e.g., physical cell ID (PCID), virtual cell ID (VCID), or other) to distinguish neighboring cells. In some examples, a cell may also refer to a geographical coverage area 110 or a portion (e.g., a sector) of a geographical coverage area 110 in which the logical communication entity operates. Such a cell may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area depending on various factors such as the capabilities of the network node 105. For example, a cell may be or include, among others, a building, a subset of a building, or an outside space between or overlapping with the geographical coverage area 110.

[0071]

[0084] A macro cell generally covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs 115 that subscribe to the service of a network provider that supports the macro cell. A small cell may be associated with a lower power network node 105 compared to a macro cell, and the small cell may operate in the same or a different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to UEs 115 that subscribe to the service of the network provider, or may provide restricted access to UEs 115 that have an association with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with a user in a home or office). A network node 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0072]

[0085] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0073]

[0086] In some embodiments, the network nodes 105 may be mobile and thus may provide communication coverage to moving geographic coverage areas 110. In some embodiments, the different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same network node 105. In other embodiments, the overlapping geographic coverage areas 110 associated with different technologies may be supported by different network nodes 105. The wireless communication system 100 may include a heterogeneous network, for example, where different types of network nodes 105 provide coverage to various geographic coverage areas 110 using the same or different radio access technologies.

[0074]

[0087] The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, the network nodes 105 may have similar frame timing and transmissions from different network nodes 105 may be approximately aligned in time. For asynchronous operation, the network nodes 105 may have different frame timing and transmissions from different network nodes 105 may not be aligned in time in some embodiments. The techniques described herein may be used for either synchronous or asynchronous operation.

[0075]

[0088] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via Machine-to-Machine (M2M) communication). M2M communication or MTC may refer to data communication technologies that allow devices to communicate with each other or with network nodes 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that incorporate sensors or meters to measure or capture information and relay that information to a central server or application program that utilizes such information or presents the information to a human who interacts with the application program. Some UEs 115 may 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 business billing.

[0076]

[0089] Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception, but not simultaneous transmission and reception). In some examples, the half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UEs 115 include entering a power saving deep sleep mode when not engaged in active communication, operating over a limited bandwidth (e.g., pursuant to narrowband communication), or a combination of these techniques. For example, some UEs 115 may be configured for operation 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 guard band of the carrier, or outside of a carrier.

[0077]

[0090] The wireless communication system 100 may be configured to support ultra-reliable or low-latency communications, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission-critical communications. The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission-critical functionality). Ultra-reliable communications may include private or group communications and may 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 may include service prioritization, and the mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0078]

[0091] In some examples, the UE 115 may also be able to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) protocol or a D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of the network node 105. Other UEs 115 in such a group may be outside of the geographic coverage area 110 of the network node 105 or may not otherwise be able to receive transmissions from the network node 105. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to every other UE 115 in the group. In some embodiments, the network node 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without the involvement of the network node 105.

[0079]

[0092] In some systems, the D2D communication link 135 may be an example of a communication channel between vehicles (e.g., UE 115), such as a sidelink communication channel. In some examples, the vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination thereof. The vehicles may signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, the vehicles in the V2X system may communicate with roadside infrastructure, such as roadside units, and / or with a network via one or more network nodes (e.g., network node 105) using vehicle-to-network (V2N) communication.

[0080]

[0093] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) that manages access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) that routes packets or interconnects to external networks. The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for UEs 115 served by network nodes 105 associated with the core network 130. User IP packets may be forwarded through a user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0081]

[0094] Some of the network devices, such as the network node 105, may include subcomponents, such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 via one or more other access network transmission entities 145, which may be referred to as a radio head, a smart radio head, or a TRP 180. Each access network transmission entity 145 may include one or more antenna panels. In some configurations, various functions of each access network entity 140 or network node 105 may be distributed across various network devices (e.g., radio heads and ANCs) or may be integrated into a single network device (e.g., the network node 105).

[0082]

[0095] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). The 300 MHz to 3 GHz region is commonly known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter in length. Although UHF waves may be blocked or redirected by buildings and environmental features, the waves may penetrate structures well enough for a macrocell to serve UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using lower frequencies and longer waves in the shortwave (high frequency (HF)) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0083]

[0096] The wireless communication system 100 may also operate in the super 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 of the spectrum, also known as the millimeter band (e.g., from 30 GHz to 300 GHz). In some embodiments, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the network node 105, and the EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the devices. However, propagation of EHF transmissions may be subject to greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The techniques disclosed herein may be employed over transmissions using one or more different frequency regions, and the designated use of the bands over these frequency regions may vary by country or regulatory body.

[0084]

[0097] The electromagnetic spectrum is often subdivided into various classes, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified with frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). It should be understood that FR1 is often referred to (interchangeably) as the "sub-6 GHz" band in various documents and papers, although a portion of FR1 is above 6 GHz. Similar nomenclature issues may arise with respect to FR2, which is often referred to (interchangeably) as the "millimeter wave" band in documents and papers, even though it is different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "millimeter wave" band by the International Telecommunications Union (ITU).

[0085]

[0098] The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified these mid-band frequency operating bands as frequency range designation FR3 (7.125 GHz to 24.25 GHz). Frequency bands that fall within FR3 may inherit FR1 and / or FR2 characteristics, and thus may in effect extend the features of FR1 and / or FR2 to the mid-band frequencies. Additionally, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6 GHz to 71 GHz), FR4 (52.6 GHz to 114.25 GHz), and FR5 (114.25 GHz to 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0086]

[0099] With the above aspects in mind, it should be understood that unless otherwise specified, terms such as "sub-6 GHz" as used herein may broadly refer to frequencies that may be below 6 GHz, may be within FR1, or may include mid-band frequencies. Additionally, it should be understood that unless otherwise specified, terms such as "mmWave" as used herein may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and / or FR5, or may be within the EHF band.

[0087]

[0100] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may utilize License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band, such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices such as the network node 105 and the UE 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation in the unlicensed band may be based on a carrier aggregation configuration in conjunction with a component carrier operating in a licensed band (e.g., LAA). Operation in the unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0088]

[0101] The network node 105 or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the network node 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operations or transmit or receive beamforming. For example, one or more network node antennas or antenna arrays may be collocated in an antenna assembly such as an antenna tower. In some embodiments, the antennas or antenna arrays associated with the network node 105 may be located in various geographic locations. The network node 105 may have an antenna array with several rows and columns of antenna ports that the network node 105 may use to support beamforming of communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panels may support radio frequency beamforming for signals transmitted via the antenna ports.

[0089]

[0102] A network node 105 or UE 115 may use MIMO communications to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. Multiple signals may be transmitted by a transmitting device, for example, via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits related to the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurements and reporting. MIMO techniques include single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0090]

[0103] Beamforming, sometimes referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used at a transmitting or receiving device (e.g., network node 105, UE 115) to shape or steer an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated through antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array are subject to constructive interference, while other signals are subject to destructive interference. Adjustment of signals communicated through antenna elements may include the transmitting or receiving device applying an amplitude offset, a phase offset, or both to signals carried through the antenna element associated with the device. The adjustment associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., relative to the antenna array of the transmitting or receiving device, or to some other orientation).

[0091]

[0104] The network node 105 or the UE 115 may use beam sweeping techniques as part of a beamforming operation. For example, the network node 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform a beamforming operation for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by the network node 105 multiple times in different directions. For example, the network node 105 may transmit signals according to different beamforming weight sets associated with different directions of transmission. The transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as the network node 105 or by a receiving device such as the UE 115) beam directions for subsequent transmission or reception by the network node 105.

[0092]

[0105] Some signals, such as data signals associated with a particular receiving device, may be transmitted by the network node 105 in a single beam direction (e.g., a direction associated with a receiving device, such as the UE 115). In some examples, a beam direction associated with a transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, the UE 115 may receive one or more of the signals transmitted in different directions by the network node 105 and may report to the network node 105 an indication of the signal that the UE 115 received with the highest signal quality or an otherwise acceptable signal quality.

[0093]

[0106] In some embodiments, transmission by a device (e.g., by the network node 105 or the UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the network node 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The network node 105 may transmit a reference signal (e.g., cell-specific reference signal (CRS), CSI-RS) that may be precoded or amplify coded. The UE 115 may provide feedback for beam selection, which may be a precoding 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 the network node 105 in one or more directions, the UE 115 may employ similar techniques for transmitting a signal multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., to transmit data to a receiving device).

[0094]

[0107] A receiving device (e.g., UE 115) may attempt multiple receive configurations (e.g., directional listening) when receiving various signals, such as synchronization signals, reference signals, beam selection signals, or other control signals, from the network node 105. For example, the receiving device may attempt multiple receive directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of the antenna array, or by processing the received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as "listening" with different receive configurations or receive directions. In some examples, the receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receive configuration may be aligned to a beam direction determined based on listening with different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or possibly acceptable signal quality based on listening with multiple beam directions).

[0095]

[0108] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate on logical channels. The Media Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use error detection, error correction, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer may provide establishment, configuration, and maintenance of an RRC connection between the UE 115 and the network node 105 or core network 130, which supports radio bearers for user plane data. In the physical layer, the transport channels may be mapped to physical channels.

[0096]

[0109] In addition to or as an alternative to being performed between the UE 115 and the network node 105, the techniques described herein may be implemented via additional or alternative radio devices, including the IAB node 104, distributed units (DU) 165, centralized units (CU) 160, radio units (RU) 170, etc. For example, in some implementations, aspects described herein may be implemented in the context of a disaggregated radio access network (RAN) architecture (e.g., an open RAN architecture). In a disaggregated architecture, the RAN may be divided into three areas of functionality corresponding to the CU 160, the DU 165, and the RU 170. The division of functionality between the CU 160, the DU 165, and the RU 175 is flexible and thus results in numerous permutations of different functionality depending on which functionality (e.g., MAC functionality, baseband functionality, radio frequency functionality, and any combination thereof) is performed in the CU 160, the DU 165, and the RU 175. For example, functional division of the protocol stack may be adopted between DU 165 and RU 170 such that DU 165 may support one or more layers of the protocol stack, and RU 170 may support one or more different layers of the protocol stack.

[0097]

[0110] In some wireless communication systems (e.g., wireless communication system 100), infrastructure and spectrum resources for NR access may supplement wired backhaul connections to further support wireless backhaul link capabilities to provide an IAB network architecture. One or more network nodes 105 may include a CU 160, a DU 165, and an RU 170 and may be referred to as a donor network node 105 or an IAB donor. One or more DUs 165 (e.g., and / or RUs 170) associated with the donor network node 105 may be controlled in part by a CU 160 associated with the donor network node 105. One or more donor network nodes 105 (e.g., IAB donors) may communicate with one or more additional network nodes 105 (e.g., IAB nodes 104) via supported access links and backhaul links. The IAB nodes 104 may support mobile terminal (MT) functions controlled and / or scheduled by the DUs 165 of the associated IAB donors. Additionally, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., the IAB node 104, the UE 115, etc.) in an access network (e.g., downstream) relay chain or configuration. In such cases, one or more components of the disaggregated RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to perform one or more of the signaling and TRS configurations for SFN communications described herein.

[0098]

[0111] In some embodiments, the wireless communication system 100 may include a core network 130 (e.g., a next generation core network (NGC)), one or more IAB donors, IAB nodes 104, and UEs 115, where the IAB nodes 104 may be controlled in part by each other and / or the IAB donor. The IAB donor and the IAB nodes 104 may be examples of aspects of a network node 105. The IAB donor and the one or more IAB nodes 104 may be configured as (e.g., communicate according to) some relay chain.

[0099]

[0112] For example, an access network (AN) or RAN may refer to communication between an access node (e.g., an IAB donor), an IAB node 104, and one or more UEs 115. An IAB donor may facilitate a connection between the core network 130 and an AN (e.g., via a wired or wireless connection to the core network 130). That is, an IAB donor may refer to a RAN node that has a wired or wireless connection to the core network 130. An IAB donor may include a CU 160 and at least one DU 165 (e.g., and RU 170), and the CU 160 may communicate with the core network 130 via an NG interface (e.g., some backhaul link). The CU 160 may host layer 3 (L3) (e.g., RRC, service data adaptation protocol (SDAP), PDCP, etc.) functions and signaling. At least one DU 165 and / or RU 170 may host lower layers such as layer 1 (L1) and layer 2 (L2) (e.g., RLC, MAC, physical (PHY), etc.) functions and signaling, each of which may be at least partially controlled by CU 160. DU 165 may support one or more different cells. IAB donors and IAB nodes 104 may communicate over an F1 interface according to some protocol (e.g., F1 AP protocol) that defines signaling messages. In addition, CU 160 may communicate with the core network over an NG interface (which may be an example of a portion of a backhaul link) and with other CUs 160 (e.g., CUs 160 associated with alternative IAB donors) over an Xn-C interface (which may be an example of a portion of a backhaul link).

[0100]

[0113] An IAB node 104 may refer to a RAN node that provides IAB functionality (e.g., access for UEs 115, wireless self-backhaul capabilities, etc.). An IAB node 104 may include a DU 165 and an MT. The DU 165 may act as a distributed scheduling node with respect to a child node associated with the IAB node 104, and the MT may act as a scheduled node with respect to a parent node associated with the IAB node 104. That is, an IAB donor may be referred to as a parent node that communicates with one or more child nodes (e.g., an IAB donor may relay a transmission for a UE through one or more other IAB nodes 104). In addition, an IAB node 104 may be referred to as a parent node or a child node with respect to other IAB nodes 104 depending on the relay chain or configuration of the AN. Thus, the MT entity of the IAB node 104 (e.g., MT) can provide a Uu interface through which a child node receives signaling from a parent IAB node 104, and the DU interface (e.g., DU 165) can provide a Uu interface through which a parent node transmits signaling to a child IAB node 104 or UE 115.

[0101]

[0114] For example, the IAB node 104 may be referred to as a parent node associated with the IAB node and a child node associated with the IAB donor. The IAB donor may include a CU 160 having a wired (e.g., optical fiber) or wireless connection to the core network and may act as a parent node to the IAB node 104. For example, the DU 165 of the IAB donor may relay a transmission to the UE 115 via the IAB node 104 and may directly signal a transmission to the UE 115. The CU 160 of the IAB donor may signal a communication link establishment to the IAB node 104 via the F1 interface, and the IAB node 104 may schedule a transmission (e.g., a transmission to the UE 115 relayed from the IAB donor) via the DU 165. That is, data may be relayed to and from the IAB node 104 via signaling over the NR Uu interface to the MT of the IAB node 104. Communications with the IAB node 104 may be scheduled by the DU 165 of the IAB donor, and communications with the IAB node 104 may be scheduled by the DU 165 of the IAB node 104.

[0102]

[0115] For the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture (e.g., one or more IAB nodes 104 or components of an IAB node 104) may be configured to perform one or more of the signaling and TRS configurations for SFN communications described herein.

[0103]

[0116] The UE 115 and the network node 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that the data is correctly received on the communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions). In some examples, a device may support same-slot HARQ feedback, in which the device may provide HARQ feedback in a particular slot for data received in a previous symbol in that slot. In other cases, the device may provide HARQ feedback in a subsequent slot or according to some other time interval.

[0104]

[0117] In some embodiments, the UE 115 may perform channel estimation for SFN channels associated with at least two TRPs 180 based on an SFN configuration for the UE 115. The UE 115 may transmit a UE capability message to indicate support of the SFN configuration in some embodiments. That is, the UE 115 may indicate an ability to receive signals from two or more TRPs 180 in a single time resource. A network entity, such as the network node 105, a TRP 180 of the network node 105, or some other entity, may transmit a control message to the UE 115 to indicate resources for reference signal reception from at least two TRPs 180 of the network according to the SFN configuration. The control message may indicate a resource set for simultaneous reference signal reception from the first TRP 180 and the second TRP 180 according to the UE capability message. Additionally or alternatively, the control message may indicate two or more time resources associated with reference signals transmitted by the first TRP 180 and the second TRP 180 according to the SFN configuration. The UE 115 may receive a first reference signal from the first TRP 180 and a second reference signal from the second TRP 180 in accordance with the resource configuration. The UE 115 may perform channel estimation for the SFN channel associated with the first TRP 180 and the second TRP 180 based on the first reference signal and the second reference signal in accordance with the SFN configuration. The UE may communicate with at least one of the first TRP 180 or the second TRP 180 in accordance with the channel estimation. The UE 115 may thereby perform channel estimation for the SFN channel based on a configuration of one or more resources associated with the SFN configuration.

[0105]

[0118] 2 illustrates an example of a wireless communication system 200 supporting a TRS configuration for a SFN communication system according to one or more aspects of the present disclosure. In some examples, the wireless communication system 200 may implement or be implemented by aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a UE 115-a, which may represent an example of a UE 115 described with reference to FIG. 1. The UE 115-a may be in wireless communication with a network node 205, which may represent an example of a network node 105 or some other network entity described with reference to FIG. 1. The network node 205 may transmit or relay data or control signaling to the UE 115-a via one or more other access network transmission entities, which may be referred to as radio heads or TRPs 210.

[0106]

[0119] The TRPs 210-a and 210-b may be included in or associated with the network node 205. The network node 205 and the TRPs 210 may communicate with each other via one or more backhaul links 220, which may be an embodiment of the backhaul links 120 described with reference to FIG. 1. The UE 115-a may communicate with the TRPs 210 via an uplink communication link 215 and a downlink communication link 225. For example, the TRPs 210-a and 210-b may transmit a reference signal 230, a control message 235, or both to the UE 115-a via the downlink communication links 225-a and 225-b, respectively. The UE 115-a may transmit one or more uplink signals and / or UE capability messages 240 to the TRPs 210-a, TRPs 210-b, or both, via the uplink communication links 215-a and 215-b, respectively. In some embodiments, the control message 235 may include a resource configuration for SFN communication by the UE 115-a.

[0107]

[0120] Each of the UE 115-a and the TRPs 210-a and 210-b can communicate using a set of beams 245. For example, the UE 115-a can communicate using one or more beams in the set of beams 245-c. The UE 115-a can switch beams based on communication from the TRP 210-a, the TRP 210-b, or both. The TRP 210-a can communicate using one or more beams in the set of beams 245-a, and the TRP 210-b can communicate using one or more beams in the set of beams 245-b. Each TRP 210 can switch between beams based on communication from the UE 115-a.

[0108]

[0121] The TRPs 210 may communicate with the UE 115-a using an SDM scheme, an FDM scheme, a TDM scheme, or a combination thereof. The TRPs 210 may coordinate transmissions of downlink channels (e.g., a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), or both), uplink channels (e.g., a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or both). For example, the SDM scheme may involve TRPs 210-a and TRPs 210-b performing joint transmissions on the same resources (e.g., on the same set of resource elements and OFDM symbols) based on transmitting different layers, such as spatial layers, having different transmission configuration indication (TCI) states. Additionally or alternatively, the FDM scheme may involve TRP 210-a and TRP 210-b performing joint transmissions on different frequency resources and overlapping time resources, such as on different sets of resource elements but on the same set of OFDM symbols, based on transmitting different sets of frequency domain resources (e.g., resource elements) with different TCI states. In some embodiments of the TDM scheme, TRP 210-a and TRP 210-b may perform joint transmissions on different time resources and overlapping frequency resources, such as on different sets of OFDM symbols and overlapping sets of resource elements, based on transmitting different sets of time domain resources (e.g., OFDM symbols, slots, or minislots) with different TCI states.

[0109]

[0122] In some embodiments, the TRPs 210-a and 210-b may perform joint transmissions to the UE 115-a using an SFN communication configuration, sometimes referred to as a single frequency communication configuration. The SFN communication configuration may be a type of multi-TRP communication configuration in which multiple TRPs 210 may transmit the same data sequence on overlapping time and / or frequency resources. The SFN communication may transmit according to one or more types of communication schemes. For example, the TRPs 210-a and 210-b may transmit the same transmission to the UE 115-a according to a multi-TRP communication configuration, such as an SDM scheme, an FDM scheme, a TDM scheme, etc., and the downlink transmission is associated with two or more TCI states corresponding to the two or more TRPs 210. In other words, the downlink communication links 225-a and 225-b may be or may be part of an "SFN-ized" downlink communication link, sometimes referred to as a combined SFN channel 250. A non-SFN communication configuration may accommodate communications in which two or more TPRs 210 refrain from utilizing a combined SFN channel 250 and instead transmit the same or different data or control information to a UE 115 over non-overlapping time and / or frequency resources (e.g., in an asynchronous manner).

[0110]

[0123] The TRP 210-a and the TRP 210-b can perform joint transmission to the UE 115-a according to various types of SFN communication schemes, such as SFN communication scheme 1 or SFN communication scheme 2, which will be described in more detail with respect to FIG. 3. The UE 115-a can use macro diversity or frequency diversity gain to assist in receiving signals from multiple spatially distributed TRPs 210. In some cases, one or more TRPs 210 configured to use SFN can use beamforming via a set of beams 245 to transmit signals via one or more beams, or alternatively or additionally transmit signals in an area, direction, or both (e.g., using a single beam). In some embodiments, the UE 115-a can use the SFN scheme when the UE 115-a has relatively high mobility, such as in a high speed train (HST) scenario. Furthermore, SFN communication can be useful for some service types, such as broadcast or multicast services.

[0111]

[0124] In some embodiments, the network node 205 may not indicate to the UE 115-a that the data is coming from different TRPs 210, which may be referred to as a transparent SFN communication configuration. That is, the UE 115-a may assume that there is a single channel to receive and demodulate, and the UE 115-a may select a valid beam from the set of beams 245-c to receive the transmission over the channel. In some embodiments, the channels used by the different TRPs 210 may be relatively different, and it may be beneficial to indicate that the transmission is coming from a separate TRP 210 and corresponding beam. Thus, during some SFN communication configurations, the network node 205 may indicate that the transmission is coming from a separate TRP 210 and corresponding beam (e.g., the received beam is a combination of a first beam from TRP 210-a and a second beam from TRP 210-b), which may be referred to as a non-transparent SFN communication configuration. Different schemes for SFN communication configurations are described in more detail with reference to Figures 3A and 3B.

[0112]

[0125] The wireless communication system 200 may support one or more multi-TRP communication configurations, single-TRP communication configurations, or both. The multi-TRP communication configuration may be or may support a SFN or non-SFN scheme. For example, as shown in the wireless communication system 200, the TRP 210-a, TRP 210-b, or both may perform joint transmission (e.g., multi-TRP transmission) and signaling to the UE 115-a, may communicate independently with the UE 115-a (e.g., may perform non-joint transmission or single TRP-based transmission), or both. In some embodiments of multi-TRP communication, the TRPs 210-a and 210-b may communicate with the UE 115-a and one or more other UEs 115 using different communication schemes to increase spectral efficiency. The communication schemes may include SDM, FDM, TDM, or multi-TRP schemes. The communication schemes may include one or more of non-SFN or SFN schemes with or without Doppler shift pre-compensation. In some embodiments, the communication scheme may include a single TRP / TCI based transmission with dynamic transmission point switching. In some cases, two or more transmission configuration options or corresponding transmission modes may be dynamically switched by the network depending on the network load, UE location, channel conditions, UE speed, UE type, and other factors.

[0113]

[0126] For some SFN communications (e.g., SFN communication scheme 1 described with reference to FIG. 3A), the network node 205 may configure one or more resource sets (e.g., UE-specific non-zero power (NZP) resource sets, such as NZP-CSI-RS-ResourceSets with higher layer parameter trs-Info) for the transmission of reference signals 230 to the UE 115-a. The network node 205 may configure the resource sets in a distributed manner such that each TRP 210 may transmit reference signals 230 (e.g., channel state information (CSI) reference signals) over one or more resource sets. Additionally or alternatively, the network node 205 may configure a limit on the number of resource sets in the wireless communication system 200 such that the number of resource sets is the same as the number of TRPs 210 deployed in the SFN area.

[0114]

[0127] Each TRP 210 may transmit a reference signal 230 over a resource set. The reference signal 230 may include synchronization signal blocks (SSBs), TRSs, demodulation reference signals (DMRSs), or any combination thereof. For example, the TRP 210-a may transmit one or more SSBs to the UE 115-a for synchronization. The TRP 210-a may transmit one or more TRSs (e.g., per-TRP TRSs) that may indicate TCI status information (e.g., quasi-colocation (QCL) information) associated with the TRP 210-a based on the SSBs. The TRP 210-a may additionally or alternatively transmit one or more DMRSs that may derive TCI status information from the TRSs transmitted by the TRP 210-a and the TRSs transmitted by the TRP 210-b (e.g., corresponding to SFN channels).

[0115]

[0128] Thereby, the UE 115-a can receive a first TRS from the TRP 210-a and a second TRS from the TRP 210-b. The UE 115-a can track a first channel (e.g., H1) between the UE 115-a and the TRP 210-a based on the first TRS. The UE 115-a can track a second channel (e.g., H2) between the UE 115-a and the TRP 210-b based on the second TRS. When the TRP 210-a and the TRP 210-b perform a joint transmission to the UE 115-a using an SFN communication configuration, the UE 115-a can track a combined SFN channel 250 (e.g., an effective channel, H1) associated with both the TRPs 210. e , H e ≈H1+H2) (e.g., UE 115-a may use the first and second TRSs as a source reference signal for the QCL). In some embodiments, tracking and demodulating each channel may be referred to as performing a channel estimation procedure for the channel.

[0116]

[0129] The network node 205 may optionally configure one or more resource sets (e.g., n resource sets associated with each TCI state) for each TRP 210, and the UE 115-a may track each reference signal 230 configured by the network. That is, the UE 115-a may track up to n TRSs received from the TRP 210-a and n TRSs received from the TRP 210-b. The UE 115-a may additionally or alternatively track a combination of TRSs received from both the TRP 210-a and the TRP 210-b for use in estimating and demodulating the combined SFN channel 250 (e.g., based on a linear combination of QCL information from the TRP 210). In some cases, whether to track the combined SFN channel 250 may be configured (e.g., pre-configured according to a rule) in the UE 115-a to reduce processing. However, if n resource sets are configured for each TRP 210, then there are at most n TRSs and corresponding beams for the UE 115-a to track in order to estimate the combined SFN channel 250. 2 There may be combinations of SFN beams. Additionally or alternatively, the effective SFN beam used to communicate with the UE 115-a may be based on the location of the UE 115-a within the SFN region (e.g., relative to the TRP 210). Thus, there may be relatively high overhead and processing by the UE 115-a to perform SFN channel estimation.

[0117]

[0130] In some cases, a combination of one or more of the reference signals 230 from two or more TRPs 210 may not provide an accurate representation or estimate of the effective combined SFN channel 250. For example, if the reference signals 230 are transmitted over resources that are relatively far apart in the time domain (e.g., TDM-ized TRS), the tracking loop used by the UE 115-a to track the first reference signal 230 may not be combined with the tracking loop used by the UE 115-a to track the second reference signal 230, and the UE 115-a may not accurately estimate the effective combined SFN channel 250. In some cases, the network node 205 may indicate a pairing between two or more reference signal resources that can be utilized in combination as a source signal for SFN transmission. The UE 115-a may jointly track the reference signals 230 received over the indicated two or more resources based on the indication. The network node 205 may indicate the pairing via RRC signaling. For example, the TRP 210-a, TRP 210-b, or both, may relay RRC signaling or other control signaling from the network node 205 to the UE 115-a. Such signaling to indicate the dynamic pairing of reference signal resources may result in relatively high overhead and latency.

[0118]

[0131] To improve channel estimation and reference signal transmission for SFN communication while reducing overhead, the network node 205 described herein may transmit a control message 235 to the UE 115-a to indicate a resource configuration for the UE 115-a to use to track the combined SFN channel 250. The resource configuration may indicate dynamic pairing of TRP-specific reference signals 230 for SFN communication. For example, the resource configuration may indicate pairing between two or more resource sets that overlap in the time domain, pairing between two or more resources that do not overlap in the time domain based on a relationship between the two or more resources, or both. In some embodiments, a control channel (e.g., scheduling downlink control information (DCI) or PDCCH) that schedules the reference signal 230, a reference signal configuration message (e.g., a TRS configuration message), or a MAC-CE that activates the resource configuration may include one or more fields configured to indicate that SFN operations are to be performed by the UE 115-a based on the reference signal resources.

[0119]

[0132] In some embodiments, the UE 115-a may be configured to identify associations between TRS resources for SFN channel estimation based on resource configuration and joint triggering of two or more overlapping resource sets. For example, the TRPs 210-a and 210-b may transmit first and second TRSs, respectively, to the UE 115-a in overlapping time resources (e.g., the same symbol). The TRPs 210-a and 210-b may scramble the TRS according to different scrambling sequences associated with the IDs of the respective TRPs 210, or the TRPs 210 may transmit the TRS in an FDM or SDM manner. Each resource set may be configured for each TRP 210. In some embodiments, the two or more resource sets may be configured with the same periodicity (e.g., semi-persistent, periodic, or aperiodic), the same offset parameters, or both, that may be triggered together (e.g., via the same PDCCH or DCI message). Additionally or alternatively, the two or more resource sets may be scheduled by separate triggering DCIs (e.g., carried by separate PDCCHs), but the scheduling offsets for the two or more resource sets may be configured such that the resource sets overlap in the time domain (e.g., the TRSs are received simultaneously or at least partially overlap in time). The UE 115-a may be configured to track the TRSs received from the TRPs 210-a and 210-b as potential candidates for SFN operation based on the TRSs being received in overlapping time resources. Resource configurations for tracking overlapping resource sets for SFN communications are described in further detail elsewhere herein, including with reference to FIG. 4.

[0120]

[0133] The network node 205 may transmit a control message 235 to the UE 115-a based on the capabilities of the UE 115-a. For example, the UE 115-a may transmit a UE capability message 240 to the TRP 210-a, the TRP 210-b, or both, via the respective uplink communication links 215-a and / or 215-b. The TRP 210 may forward the UE capability message 240 to the network node 205. The UE capability message 240 may indicate a capability to support one or more multi-TRP communication configurations (e.g., SFN, SDM, FDM, or any combination thereof). That is, the UE capability message 240 may indicate support of an SFN configuration in which two or more reference signals 230 are received by the UE 115-a in the same time resource (e.g., the same symbol).

[0121]

[0134] The UE capability message 240 may include one or more fields configured to indicate the ability of the UE 115-a to receive reference signals 230 from at least TRP 210-a and TRP 210-b in the same time resource according to an SFN communication configuration. In some embodiments, the UE capability message 240 may be configured to indicate support for a multi-TRP communication configuration over a PDCCH or PDSCH, and a field may be added or reconfigured within the UE capability message 240 to indicate support for receiving reference signals 230 in overlapping time resources. Additionally or alternatively, the UE capability message 240 may indicate support for SFN communication by the UE 115-a, and the network node 205 may identify that the UE 115-a is capable of receiving two or more reference signals 230 in the same time resource (e.g., using SFN, SDM, FDM, or other communication configuration type) based on the support for SFN communication. If the UE 115-a indicates support for SDM or FDM communication over overlapping time resources, the UE capability may be a function of the frequency offset between the frequency resources (e.g., resource elements) used for the TRS transmission. For example, the TRP 210-a may transmit a first reference signal 230 to the UE 115-a over a first time resource and a first frequency resource, and the TRP 210-b may transmit a second reference signal 230 to the UE 115-a over the first time resource and a second frequency resource that is offset from the first frequency resource by an offset equal to or less than the offset indicated via the UE capability message 240.

[0122]

[0135] In some embodiments, the control message 235 or the second control message may indicate a resource configuration for two or more time resources for SFN channel estimation. That is, the UE 115-a may be configured with an association between two or more time resources for SFN channel estimation. The resource configuration may indicate a window configured for the UE 115-a, a relationship between resource sets per TRP, or both. The UE 115-a may determine to jointly track a first reference signal 230 from a TRP 210-a and a second reference signal 230 from a TRP 210-b for SFN channel estimation based on the reference signal 230 being received via a resource within a window or a resource within an associated resource set based on the resource configuration. Resource configuration and joint tracking between two or more time resources are described in more detail elsewhere herein, including with reference to FIG. 5.

[0123]

[0136] 3A and 3B illustrate examples of communication scheme diagrams 300 supporting TRS configurations for SFN communication, according to one or more aspects of the present disclosure. In some embodiments, the communication scheme diagrams 300-a and 300-b can be implemented to realize aspects of the wireless communication system 100 or the wireless communication system 200. For example, the TRP 305, TRP 310, or both, which may be an embodiment of the TRP 210 (e.g., multi-TRP) described with reference to FIG. 2, and one or more UEs 115 can employ one or more SFN schemes illustrated by the communication scheme diagrams 300-a and 300-b, as described with reference to FIG. 1 and FIG. 2. The network node 105 or 205 can dynamically transmit a joint DMRS configuration and a transmission mode configuration. The transmission mode configuration can relate to a transmission mode for communicating with one or more TRPs. In some cases, the TRP 305, TRP 310, or both, can transmit one or more data messages to the UE 115 using one of the SFN schemes based on the joint DMRS configuration and the transmission mode indication. In some cases, the communication scheme diagrams 300-a and 300-b may depict joint downlink transmissions to the UE 115 from a TRP 305 applying a TCI state 315 and from a TRP 310 applying a TCI state 320.

[0124]

[0137] Communication scheme diagram 300-a illustrates SFN scheme 1. In such SFN scheme 1, TRP 305 and TRP 310 may transmit two separate reference signals (e.g., Reference Signal 1 and Reference Signal 2, respectively). Each reference signal may correspond to a single TRP PDSCH transmission and the corresponding TCI state of the TRP. The reference signals may also be associated with a joint "SFN-ized" PDSCH, or in some embodiments, a PDCCH. That is, each of Reference Signal 1 and Reference Signal 2 may function as a source reference signal for demodulating a PDCCH or PDSCH transmitted in the SFN scheme. Each DMRS port (e.g., DMRS Port 0 and DMRS Port 2) or data layer of the "SFN-ized" PDSCH may be associated with both a TCI state 315 and a TCI state 320. In other words, TRP305 and TRP310 can transmit reference signals (such as TRS) in a TRP-specific or non-SFN manner, and the associated DMRS and PDSCH or PDCCH from the TRP (e.g., for demodulating the channel) are transmitted in a SFN manner.

[0125]

[0138] Communication scheme diagram 300-b illustrates SFN scheme 2. In such SFN scheme 2, TRP 305 and TRP 310 may transmit two separate reference signals (e.g., reference signal 1 and reference signal 2, respectively). Each reference signal may correspond to a single TRP PDSCH transmission. A reference signal may also be associated with a joint PDSCH or PDCCH transmission, where each data layer of the joint PDSCH or PDCCH is associated with both TCI state 315 and TCI state 320, and each DMRS port of the joint PDSCH or PDCCH is associated with either TCI state 315 or TCI state 320 (e.g., not both). For example, DMRS port 0 of the joint PDSCH may be associated with TCI state 315 (but not with TCI state 320), and DMRS port 2 of the joint PDSCH may be associated with TCI state 320 (but not with TCI state 315). In some embodiments, DMRS Port 0 may be QCL'd in TCI state 315, and DMRS Port 2 may be QCL'd in TCI state 320. The data layer of a joint PDSCH may be associated with both TCI state 315 and TCI state 320 via the DMRS port. In other words, TRP 305 and TRP 310 may transmit reference signals (e.g., TRS) and DMRS in a TRP-specific or non-SFN manner, and the associated PDSCH (e.g., data layer) from the TRP is transmitted in a SFN manner.

[0126]

[0139] The UE 115 may perform joint channel estimation for SFN channels (SFN-ized PDSCH or PDCCH) while operating according to the SFN communication scheme 1 or 2. The UE 115 may separately track a reference signal (e.g., TRS) from each of the TRPs 305 and 310 to estimate a channel between the UE 115 and the respective TRP. The UE 115 may additionally or alternatively jointly track a reference signal from each of the TRPs 305 and 310 to estimate an SFN channel associated with the TRPs 305 and 310. In some cases, the TRPs 305 and 310 may each be configured with one or more resource sets, and the UE 115 may monitor any combination of TRSs transmitted over the resource sets to estimate the SFN channel.

[0127]

[0140] To reduce overhead and UE complexity, the UE 115 may be configured with a resource configuration for estimating SFN channels. The resource configuration may indicate a dynamic pairing or grouping between resource sets that may be used to estimate a joint SFN channel. For example, the resource configuration may indicate that the UE 115 should jointly track resources received over resource sets that overlap in the time domain. Additionally or alternatively, the resource configuration may indicate a relationship between two or more resource sets, or a window associated with two or more time resources, and the UE 115 may be configured to jointly track resources within the indicated resource sets, or resources within the window, for SFN channel estimation. Resource configurations and methods for tracking pairs of TRSs for SFN operation are described in more detail elsewhere herein, including with reference to Figures 4 and 5.

[0128]

[0141] 4 illustrates an example of a reference signal resource timeline 400 supporting a TRS configuration for a SFN communication system, according to one or more aspects of the present disclosure. The reference signal resource timeline 400 may illustrate a configuration of resources in one or more slots 415-a and 415-b allocated for SFN communication between a UE 115 and a first TRP 410-a and a second TRP 410-b, which may be an example of a UE and TRP described with reference to FIGS. 1-3. In some examples, the UE 115 may be configured to identify an association between resources for SFN communication based on the resources overlapping in the time domain.

[0129]

[0142] In the example of FIG. 4, the resource set 405-a can be configured (e.g., pre-configured) for the first TRP 410-a, and the resource set 405-b can be configured (e.g., TRP-specific resource set 405) for the second TRP 410-b. The resource set 405 can include one or more time and frequency resources assigned for reference signal transmission by each TRP 410. The resource sets 405-a and 405-b can include resources that can overlap in time (e.g., in the same symbol). The TRP 410-a can transmit a first reference signal via the resource set 405-a, and the TRP 410-b can transmit a second reference signal via the resource set 405-b. In some examples, the TRP 410 can operate according to a single-TRP communication configuration (e.g., a non-SFN scheme), and the TRP 410 can transmit reference signals separately to the UE 115. Additionally or alternatively, the TRP 410 may communicate with the UE 115 according to an SFN communication configuration, as described with reference to Figures 2 and 3. The TRP 410 may communicate with the UE 115 according to SFN communication schemes 1 or 2, or some other SFN communication scheme, as described with reference to Figures 3A and 3B.

[0130]

[0143] When one or more resources for reference signal transmission by the two TRPs 410 overlap in time (e.g., simultaneous reference signal transmission), the TRPs 410-a and 410-b can transmit the first and second reference signals, respectively, in an SDM or FDM manner via resources using different scrambling sequences. For example, the TRP 410-a can transmit the first reference signal to the UE 115 via a first time and frequency resource of the first resource set 405-a, and the first reference signal can be scrambled according to the first scrambling sequence. The TRP 410-b can transmit the second reference signal to the UE 115 via a second time and frequency resource of the second resource set 405-b that overlaps with the first time and frequency resource (e.g., via the same symbol and resource element). The second reference signal can be scrambled according to the second scrambling sequence. The first and second scrambling sequences may be functions of the first and second IDs of the TRPs 410-a and 405-b, respectively.

[0131]

[0144] Additionally or alternatively, the TRP 410-a can transmit a first reference signal over a first time resource in the first resource set 405-a, and the TRP 410-b can transmit a second reference signal over a second time resource (e.g., over the same symbol) in the second resource set 405-b that overlaps with the first time resource in an SDM manner. That is, the reference signals may be SDM-ized and may correspond to different code division multiplexing (CDM) groups. In another embodiment, the reference signals may be transmitted in an FDM manner such that the reference signals can be transmitted in the same time resource and different frequency resources.

[0132]

[0145] The UE 115 may be configured to dynamically identify an association between the resource set 405-a and the resource set 405-b based on a joint trigger of the two resource sets 405. For example, a control signal, such as a DCI, that triggers a reference signal transmission may configure the resource set 405-a and the resource set 405-b with the same periodicity (e.g., aperiodic, semi-persistent, or periodic reference signal transmission), the same offset parameter, or both. The UE 115 may be configured to identify a joint trigger for the resource sets 405-a and 405-b and to jointly track resources in both the resource sets 405-a and 405-b as potential candidates for SFN operation (e.g., may be preconfigured according to one or more rules). That is, the UE 115 may monitor the first reference signal and the second reference signal together as potential source signals for estimating the SFN channel associated with the TRP 410-a and the TRP 410-b.

[0133]

[0146] Additionally or alternatively, the first PDCCH can carry a first DCI that schedules (e.g., triggers) a first reference signal transmission over resource set 405-a, and the second PDCCH can carry a second DCI that schedules a second reference signal transmission over resource set 405-b. In such a case, the first and second DCIs can be configured with a scheduling offset such that the first and second reference signals are received at resources that overlap in the time domain (e.g., the first and second reference signals are received simultaneously or at least partially overlap in time). The UE 115 can identify that the first and second resource sets 405-a and 405-b include overlapping time resources, and the UE 115 can be configured to jointly track resources in both resource sets 405-a and 405-b as potential candidates for SFN operation based on the overlap between the resource sets 405.

[0134]

[0147] The network can schedule overlapping resources for SFN transmission based on the UE capability message indicating the UE 115's ability to support the SFN configuration, as described with reference to Figure 2. The UE 115 can thereby perform joint TRS tracking and SFN channel estimation based on two or more TRSs received from two or more TRPs 410 on the same symbol or other time resource.

[0135]

[0148] FIG. 5 illustrates an example of a reference signal resource timeline 500 supporting a TRS configuration for a SFN communication system, according to one or more aspects of the present disclosure. The reference signal resource timeline 500 may illustrate a configuration of resources in one or more slots 515-a and 515-b allocated for SFN communication between a UE 115 and a first TRP 510-a and a second TRP 510-b, which may be an example of a UE and TRP described with reference to FIGS. 1-4. In some examples, the UE 115 may be configured to identify an association between resources for SFN communication based on a window 520 configured for the UE 115, an indicated relationship or association between resource sets 505, or both. In some examples, the window 520 may be configured according to a window configuration, which may indicate a number of slots or symbols for the window 520 or an absolute time. The number of slots or symbols may be based on a numerology associated with the window 520, a frame numerology for a frame associated with the window 520, or some combination. The numerology or frame numerology may indicate subcarrier spacing, symbol duration, cyclic prefix (e.g., normal or extended), etc.

[0136]

[0149] In the example of FIG. 5, a resource set 505-a can be configured (e.g., pre-configured) for a first TRP 510-a, and a resource set 505-b can be configured (e.g., TRP-specific resource set 505) for a second TRP 510-b. The resource set 505 can include one or more time and frequency resources assigned for reference signal transmission by each TRP 510. The resource sets 505-a and 505-b can include separate time resources that do not overlap in time. The TRP 510-a can transmit a first reference signal via the resource set 505-a, and the TRP 510-b can transmit a second reference signal via the resource set 505-b. In some examples, the TRP 510 can operate according to a single-TRP communication configuration (e.g., a non-SFN scheme), and the TRP 510 can transmit reference signals separately to the UE 115. Additionally or alternatively, the TRP 510 may communicate with the UE 115 according to an SFN communication configuration, as described with reference to Figures 2 and 3. The TRP 510 may communicate with the UE 115 according to SFN communication scheme 1 or 2, or some other SFN communication scheme, as described with reference to Figures 3A and 3B.

[0137]

[0150] In the embodiment of Figure 5, the UE 115 may be configured to dynamically identify an association between two or more different time resources in resource sets 505-a and 505-b based on a resource configuration for the two or more time resources. The UE 115 may receive an indication of the resource configuration via a control message as described with reference to Figure 2. The resource configuration may indicate a window 520 associated with the two or more time resources, an association between two or more different resource sets 505, or both. The UE 115 may determine to track the indicated two or more resources together for SFN channel estimation based on the resource configuration.

[0138]

[0151] In some embodiments, the resource configuration may indicate that the UE 115 should identify reference signals for joint SFN tracking based on the window 520. The UE 115 may be configured with the window 520, or the UE 115 may receive RRC signaling or some other control signaling indicating the window 520. Reference signal resources within the window 520 may be paired for joint reference signal tracking. The reference signal resources within the window 520 may be from the same resource set 505 (e.g., NZP CSI-RS set), from different resource sets 505, or both. That is, the window 520 may span one or more resource sets 505. In some embodiments, the UE 115 may receive control signaling indicating the configuration of resource sets 505-a and 505-b within the window 520. Additionally or alternatively, the UE 115 may determine that resource sets 505-a and 505-b are within the window 520 based on a periodicity of resources within the resource set 505, an offset associated with the resource set 505, UE capabilities, or any combination thereof.

[0139]

[0152] In the embodiment of FIG. 5, resources from resource set 505-a and resource set 505-b may be within window 520. If UE 115 is configured (e.g., pre-configured) with window 520 or receives control signaling indicating window 520, UE 115 may jointly monitor and track reference signals received via resource sets 505-a and 505-b within window 520 as potential candidates for SFN operation. UE 115 may receive a first reference signal from TRP 510-a via resource set 505-a within slot 515-a. UE 115 may receive a second reference signal from TRP 510-b via resource set 505-b within slot 515-a. The reference signals may be received in separate time resources that may be located within window 520. UE 115 may perform channel estimation for SFN channels associated with TRP 510-a and TRP 510-b based on the time resources being within window 520. 5 may be outside of window 520. Thus, UE 115 may not monitor resources of resource set 505-b in slot 515-b as potential candidates for SFN operation with resources in window 520.

[0140]

[0153] The starting boundary of the window 520 may be indicated via a configuration for the window 520. The starting boundary may be defined relative to a time domain position of a reference signal resource (e.g., a moving window 520). For example, the starting boundary of the window 520 may be based on a symbol or other TTI at which the TRS is received by the UE 115 via the resource set 505-a or 505-b. Additionally or alternatively, the starting boundary of the window 520 may be defined relative to a control channel that triggers a reference signal transmission via the reference signal resource (e.g., a fixed window 520). For example, the network node may transmit a DCI or some other control message to the UE 115 via the PDCCH to schedule one or more reference signals to be transmitted via the resource set 505. The starting boundary of the window may be defined relative to the last symbol of the PDCCH (e.g., X ms or X symbols after the last symbol of the PDCCH).

[0141]

[0154] The UE 115 may maintain a first receiver chain 525-a associated with a TRP 510-a and a second receiver chain 525-b associated with a TRP 510-b, as shown in FIG. 5. For example, the UE 115 may operate in a discontinuous reception (DRX) mode using a TRP 510-a or a TRP 510-b. When the UE 115 operates in a DRX mode using a TRP 510-a, the UE 115 may power on the first receiver chain 525-a associated with the TRP 510-a and monitor the resource set 505-a, and the time when the first receiver chain 525-a is powered on may be referred to as an awake or active state of the DRX mode. As part of the DRX mode, the UE 115 may power off a first receiver chain 525-a associated with the TRP 510-a (e.g., in resource set 505-b) in resources other than the resource set 505-a, such as resources not allocated for the TRP 510-a, and the time when the first receiver chain 525-a is powered off may be referred to as a sleep or inactive state of the DRX mode. Similarly, the UE 115 may power on and off a second receiver chain 525-b associated with the TRP 510-b as part of the DRX mode of operation with the TRP 510-b. In such a case, the UE 115 may be in an awake state to monitor the resource set 505-b and may be in a sleep state in other resources, such as the resource set 505-a.

[0142]

[0155] The UE 115 can update the first and second receiver chains 525 within the first refresh interval 530-a and the second refresh interval 530-b, respectively. If the UE 115 receives a first reference signal from the TRP 510-a in a first time resource in the slot 515-a and receives a second reference signal from the TRP 510-b in a second time resource after the end boundary of the window 520 in the slot 515-b, the duration between the first and second resources may be longer than the first refresh interval 530-a, the second refresh interval 530-b, or both. That is, the first receiver chain 525-a and / or the second receiver chain 525-b can be refreshed at the UE 115. Additionally or alternatively, phase continuity between transmissions may be lost. In such a case, the UE 115 may not be able to combine the first channel estimate associated with the TRP 510-a with the second channel estimate associated with the TRP 510-b to accurately estimate the effective SFN channel.

[0143]

[0156] The duration of the window 520 described herein may be configured to maintain phase continuity across reference signal measurements for SFN communications and support more efficient SFN channel estimation procedures. The duration of the window 520 (e.g., window size) may be configured to maintain phase continuity between any two reference signals received within the window 520. Additionally or alternatively, the duration of the window 520 may be longer than the duration of a refresh interval 530 at the UE 115, which may correspond to a period before the receiver chain 525 at the UE 115 is refreshed, such as refresh intervals 535-a and 535-b.

[0144]

[0157] In some embodiments, the UE 115 may receive a first reference signal from the TRP 510-a using a first beam (e.g., a first receiver antenna panel) and a second reference signal from the TRP 510-b using a second beam (e.g., a second receiver antenna panel). In such a case, the UE 115 may perform beam switching during the beam switching duration between receiving the first reference signal and receiving the second reference signal. The duration of the window 520 may be longer than the beam switching duration. Thus, the UE 115 may dynamically identify pairings or groupings between reference signals to track as potential candidates for the SFN based on the window 520 configured for the UE 115.

[0145]

[0158] The UE 115 may additionally or alternatively identify which reference signals to use for SFN operations based on a resource configuration indicating a relationship or association between resource sets 505 for SFN communications. The UE 115 may be configured with the resource configuration or may receive an indication of the resource configuration via a control message. In some embodiments, the resource configuration may indicate a modified configuration for one or more resource sets 505 (e.g., TRS resource sets). The resource configuration may indicate two or more subsets of resources in each resource set 505 (e.g., one subset of resources per TRP 510). Each subset of resources may be an example of a resource set 505 for a single TRP 510, thereby enabling the UE 115 to perform channel tracking for single-TRP communications and multi-TRP (e.g., SFN) communications. The UE 115 may be configured to track resources in each subset of resources as potential candidates for SFN operations based on the resource configuration. The UE 115 may thereby refrain from tracking other reference signal combinations for SFN operations. In such a case, the UE 115 may receive RRC signaling indicating the configuration of a subset of resources in each resource set 505. For example, the network node may send RRC signaling to the UE 115 to indicate a new resource set 505 that includes a corresponding subset of resources for each pairing of TRS resources.

[0146]

[0159] In some embodiments, the resource configuration may indicate an association or pairing between two or more resource sets 505 (e.g., TRS resource sets 505 per TRP). For example, the resource configuration may indicate that resource set 505-a for TRP 510-a is associated with resource set 505-b for TRP 510-b for SFN tracking, as indicated by the dashed arrow in FIG. 5. The UE 115 may monitor reference signals received via resource set 505-a and resource set 505-b as potential candidates for SFN channel estimation (e.g., for HST SFN scheme 1 tracking). The UE 115 may refrain from tracking reference signals received via other resource sets 505 as potential candidates for SFN operation. The UE 115 may receive the resource configuration indicating the association between the resource sets 505 via RRC signaling, via MAC-CE, or via some other control signaling that includes one or more fields configured to indicate the association between the resource sets.

[0147]

[0160] The UE 115 can thereby perform joint TRS tracking and SFN channel estimation based on a resource configuration for two or more time resources associated with reference signal transmissions from two or more TRPs 510. The resource configuration can indicate a window 520, and the UE 115 can track reference signals received within the window 520 for SFN operation. Additionally or alternatively, the resource configuration can indicate an association between a resource set 505 or a subset of resources within the resource set 505 for SFN tracking. The resource configuration can provide dynamic association of TRS resources, reduced overhead, and improved reliability and efficiency for tracking shared SFN channel parameters.

[0148]

[0161] 6 illustrates an example process flow 600 for supporting TRS configuration for SFN communication in accordance with one or more aspects of the present disclosure. The process flow 600 may implement or be implemented by aspects of the wireless communication systems 100 and 200 as described with reference to FIGS. 1 and 2, respectively. For example, the process flow 600 may implement or be implemented by network node 605 and UE 115-b, which may be examples of the base station or the TRP and UE described with reference to FIGS. 1-5. The network node 605 may include or be in communication with at least TRP 610-a and TRP 610-b.

[0149]

[0162] In the following description of process flow 600, operations between the network node 605 and the UE 115-b may be performed in a different order or at different times. Some operations may be omitted from the process flow 600, or other operations may be added. Although the network node 605 and the UE 115-b are illustrated performing the operations of process flow 600, some aspects of some operations may also be performed by one or more other wireless devices.

[0150]

[0163] At 615, the UE 115-b may send a UE capability message to the network node 605. The UE capability message may indicate support for SFN configuration. In some embodiments, the UE capability message may be configured to indicate support for receiving more than one reference signal on the same time resource. Additionally or alternatively, the UE capability message may be configured to indicate support for one or more multi-TRP schemes or SFN operation, and one or more fields in the UE capability message may be reconfigured to indicate support for receiving more than one reference signal on the same time resource.

[0151]

[0164] At 620, the UE 115-b may receive a control message based on the UE capability message from the network node 605. The control message may indicate a resource set including one or more resources for reference signal reception from the at least two TRPs 610 according to the SFN configuration. The at least two TRPs 610 may include TRPs 610-a and 610-b of the network node 605.

[0152]

[0165] At 625, in some embodiments, the UE 115-b may receive one or more reference signals on one or more resources in accordance with the control message. The one or more reference signals may include a first reference signal received from the TRP 610-a and a second reference signal received from the TRP 610-b.

[0153]

[0166] At 630, the UE 115-b may perform channel estimation for the SFN channels associated with the TRP 610-a and the TRP 610-b in accordance with the control message. The channel estimation may be based on a first reference signal of the TRP 610-a and a second reference signal of the TRP 610-b in one or more resources.

[0154]

[0167] At 635, the UE 115-b may communicate with the network node 605 via at least one of the TRP 610-a and the TRP 610-b in accordance with the channel estimation.

[0155]

[0168] 7 illustrates an example process flow 700 for supporting TRS configuration for SFN communication in accordance with one or more aspects of the present disclosure. The process flow 700 may implement or be implemented by aspects of the wireless communication systems 100 and 200 as described with reference to FIGS. 1 and 2, respectively. For example, the process flow 700 may implement or be implemented by a network node 705 and a UE 115-c, which may be an embodiment of a base station or a TRP and a UE described with reference to FIGS. 1-6. The network node 705 may include or be in communication with at least a TRP 710-a and a TRP 710-b.

[0156]

[0169] In the following description of process flow 700, operations between the network node 705 and the UE 115-c may be performed in different orders or at different times. Some operations may be omitted from process flow 700, or other operations may be added. Although the network node 705 and the UE 115-c are illustrated performing the operations of process flow 700, some aspects of some operations may also be performed by one or more other wireless devices.

[0157]

[0170] At 715, the UE 115-c may receive a control message from the network node 705. The control message may indicate a resource configuration for two or more time resources associated with reference signal transmission for the at least two TRPs 710 according to the SFN configuration. The at least two TRPs 710 may include TRP 710-a and TRP 710-b.

[0158]

[0171] At 720, in some embodiments, the UE 115-c may receive a configuration for a window associated with two or more time resources. The configuration for the window may be received via a control message.

[0159]

[0172] At 725, the UE 115-c may receive one or more reference signals from the network node 705 based on the resource configuration over two or more time resources. For example, the UE 115-c may receive a first reference signal from the TRP 710-a and a second reference signal from the TRP 710-b based on the resource configuration.

[0160]

[0173] At 730, the UE 115-c may perform channel estimation for the SFN channels associated with the TRP 710-a and the TRP 710-b in accordance with the control message. The channel estimation may be based on the first reference signal and the second reference signal. In some embodiments, the UE 115-c may perform channel estimation based on two or more time resources being located within the window. The two or more time resources may include a first time resource associated with the TRP 710-a and a second time resource associated with the TRP 710-b.

[0161]

[0174] 8 illustrates a block diagram 800 of a device 805 supporting a TRS configuration for SFN communications in accordance with one or more aspects of the disclosure. The device 805 may be an example of an aspect of a UE 115 described herein. The device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. The device 805 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0162]

[0175] The receiver 810 may provide a means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). The information may be passed to other components of the device 805. The receiver 810 may utilize a single antenna or a set of multiple antennas.

[0163]

[0176] The transmitter 815 may provide a means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information such as packets, user data, control information, or any combination thereof associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). In some embodiments, the transmitter 815 may be collocated with the receiver 810 within a transceiver module. The transmitter 815 may utilize a single antenna or a set of multiple antennas.

[0164]

[0177] The communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be examples of means for performing various aspects of the TRS configuration for SFN communications described herein. For example, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

[0165]

[0178] In some examples, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof, may be implemented in hardware (e.g., in a communications management circuit). The hardware may include a 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 configured as or otherwise supporting a means for performing the functions described in this disclosure. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by the processor executing instructions stored in the memory).

[0166]

[0179] Additionally or alternatively, in some embodiments, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communications management software or firmware). When implemented in code executed by a processor, the functions of the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting a means for performing the functions described in this disclosure), a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices.

[0167]

[0180] In some embodiments, the communications manager 820 can be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810 and transmit information to the transmitter 815, or may be integrated in combination with the receiver 810, the transmitter 815, or both to receive information, transmit information, or perform various other operations described herein.

[0168]

[0181] The communication manager 820 can support wireless communication in the UE according to embodiments disclosed herein. For example, the communication manager 820 can be configured as or otherwise support a means for transmitting a UE capability message indicating support of the SFN configuration. The communication manager 820 can be configured as or otherwise support a means for receiving a control message based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The communication manager 820 can be configured as or otherwise support a means for performing channel estimation for the SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources. The communication manager 820 can be configured as or otherwise support a means for communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0169]

[0182] Additionally or alternatively, the communication manager 820 can support wireless communication in the UE according to embodiments disclosed herein. For example, the communication manager 820 can be configured as or otherwise support a means for receiving a control message indicating a resource configuration for two or more time resources associated with a reference signal transmission for at least two TRPs according to the SFN configuration. The communication manager 820 can be configured as or otherwise support a means for receiving a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. The communication manager 820 can be configured as or otherwise support a means for performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. The communication manager 820 can be configured as or otherwise support a means for communicating with at least one of the first TRP and the second TRP according to the channel estimation.

[0170]

[0183] By including or configuring the communications manager 820 according to embodiments described herein, the device 805 (e.g., a processor controlling or otherwise coupled to the receiver 810, the transmitter 815, the communications manager 820, or a combination thereof) can support techniques for reduced processing, reduced power consumption, and more efficient utilization of communications resources. The device 805 can receive a resource configuration for SFN channel estimation. By monitoring reference signals for joint SFN channel estimation based on the resource configuration, the processor of the device 805 can refrain from receiving and processing control signaling indicating dynamic pairing between resources, thereby reducing processing and power consumption and providing more efficient utilization of communications resources. Additionally or alternatively, the processor can perform SFN channel estimation based on a limited set of TRS resource pairs or groups, thereby reducing processing and complexity.

[0171]

[0184] 9 illustrates a block diagram 900 of a device 905 supporting a TRS configuration for SFN communications in accordance with one or more aspects of the disclosure. The device 905 may be an example of an aspect of the device 805 or UE 115 described herein. The device 905 may include a receiver 910, a transmitter 915, and a communications manager 920. The device 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0172]

[0185] The receiver 910 may provide a means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). The information may be passed to other components of the device 905. The receiver 910 may utilize a single antenna or a set of multiple antennas.

[0173]

[0186] The transmitter 915 may provide a means for transmitting signals generated by other components of the device 905. For example, the transmitter 915 may transmit information such as packets, user data, control information, or any combination thereof associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). In some embodiments, the transmitter 915 may be collocated with the receiver 910 within a transceiver module. The transmitter 915 may utilize a single antenna or a set of multiple antennas.

[0174]

[0187] The device 905 or various components thereof may be an example of a means for performing various aspects of the TRS configuration for SFN communication described herein. For example, the communications manager 920 may include a UE capability message component 925, a control message receiving component 930, a channel estimation component 935, a communications component 940, a reference signal receiving component 945, or any combination thereof. The communications manager 920 may be an example of an aspect of the communications manager 820 described herein. In some embodiments, the communications manager 920 or various components thereof may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the receiver 910, the transmitter 915, or both. For example, the communications manager 920 may receive information from the receiver 910 and transmit information to the transmitter 915, or may be integrated in combination with the receiver 910, the transmitter 915, or both to receive information, transmit information, or perform various other operations described herein.

[0175]

[0188] The communication manager 920 can support wireless communication in the UE according to embodiments disclosed herein. The UE capability message component 925 can be configured as or otherwise support a means for transmitting a UE capability message indicating support of the SFN configuration. The control message receiving component 930 can be configured as or otherwise support a means for receiving a control message based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The channel estimation component 935 can be configured as or otherwise support a means for performing channel estimation for the SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources. The communication component 940 can be configured as or otherwise support a means for communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0176]

[0189] Additionally or alternatively, the communication manager 920 can support wireless communication in the UE according to embodiments disclosed herein. The control message receiving component 930 can be configured as or otherwise support a means for receiving a control message indicating a resource configuration for two or more time resources associated with a reference signal transmission for at least two TRPs according to the SFN configuration. The reference signal receiving component 945 can be configured as or otherwise support a means for receiving a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. The channel estimation component 935 can be configured as or otherwise support a means for performing channel estimation for the SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. The communication component 940 can be configured as or otherwise support a means for communicating with at least one of the first TRP and the second TRP according to the channel estimation.

[0177]

[0190] 10 illustrates a block diagram 1000 of a communications manager 1020 supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. The communications manager 1020 may be an example of an aspect of the communications manager 820, the communications manager 920, or both, described herein. The communications manager 1020, or various components thereof, may be an example of a means for performing various aspects of the TRS configuration for SFN communications described herein. For example, the communications manager 1020 may include a UE capability message component 1025, a control message receiving component 1030, a channel estimation component 1035, a communications component 1040, a reference signal receiving component 1045, a PDCCH receiving component 1050, a receiver chain component 1055, a beam switching component 1060, an RRC receiving component 1065, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0178]

[0191] The communications manager 1020 may support wireless communications in the UE according to examples disclosed herein. The UE capability message component 1025 may be configured as or otherwise support a means for transmitting a UE capability message indicating support of the SFN configuration. The control message receiving component 1030 may be configured as or otherwise support a means for receiving a control message based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The channel estimation component 1035 may be configured as or otherwise support a means for performing channel estimation for the SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources. The communications component 1040 may be configured as or otherwise support a means for communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0179]

[0192] In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a first reference signal and a second reference signal in one or more resources, the one or more resources including a first time resource associated with a first TRP and a second time resource associated with a second TRP, the first time resource and the second time resource overlapping in the time domain.

[0180]

[0193] In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a first reference signal in a first time resource and a first resource element, the first reference signal being scrambled according to a first scrambling sequence associated with a first ID of the first TRP. In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a second reference signal in a second time resource and a first resource element, the second reference signal being scrambled according to a second scrambling sequence associated with a second ID of the second TRP.

[0181]

[0194] In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a first reference signal in a first time resource and a first resource element. In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a second reference signal in a second time resource and a second resource element that does not overlap with the first resource element in the frequency domain, the first reference signal and the second reference signal being transmitted according to an FDM configuration or an SDM configuration.

[0182]

[0195] In some embodiments, the resource sets may include a first resource set associated with a first TRP and a second resource set associated with a second TRP, and the channel estimation component 1035 may be configured as or otherwise support a means for performing channel estimation for an SFN channel based on the first reference signal being received over the first resource set, the second reference signal being received over the second resource set, and the first resource set corresponding to the same periodicity, the same offset, or both, as the second resource set.

[0183]

[0196] In some embodiments, the resource sets may include a first resource set associated with a first TRP and a second resource set associated with a second TRP, and the PDCCH receiving component 1050 may be configured or otherwise support a means for receiving a first downlink control channel that schedules a first reference signal over the first resource set and a second downlink control channel that schedules a second reference signal over the second resource set. In some embodiments, the None and channel estimation component 1035 may be configured or otherwise support a means for performing channel estimation for the SFN channel based on the first reference signal being received in a first time resource of the first resource set and the second reference signal being received in a second time resource of the second resource set that overlaps with the first time resource in the time domain.

[0184]

[0197] In some embodiments, the UE capability message may include a field configured to indicate a UE capability to receive reference signals from at least two TRPs in the same time resource according to an SFN configuration. In some embodiments, the UE capability message may include one or more fields different from this field, the one or more fields indicating support for a multi-TRP communication configuration over a downlink control channel or a downlink shared channel.

[0185]

[0198] In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a first reference signal over a first symbol and a first resource element. In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a second reference signal over a first symbol and a second resource element, the one or more resources including the first symbol, the first resource element, and the second resource element. In some embodiments, the UE capabilities message component 1025 may be configured or otherwise support a means for transmitting a UE capabilities message indicating support of the SFN configuration based on a frequency offset between the first resource element and the second resource element.

[0186]

[0199] Additionally or alternatively, the communications manager 1020 can support wireless communications in the UE according to embodiments disclosed herein. In some embodiments, the control message receiving component 1030 can be configured as or otherwise support a means for receiving a control message indicating a resource configuration for two or more time resources associated with a reference signal transmission for at least two TRPs according to the SFN configuration. The reference signal receiving component 1045 can be configured as or otherwise support a means for receiving a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. In some embodiments, the channel estimation component 1035 can be configured as or otherwise support a means for performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. In some embodiments, the communication component 1040 may be configured or otherwise support a means for communicating with at least one of the first TRP and the second TRP according to the channel estimate.

[0187]

[0200] In some embodiments, the control message may indicate a window associated with two or more time resources, and the channel estimation component 1035 may be configured or otherwise support a means for performing channel estimation for the SFN channel based on the two or more time resources being located within the window, the two or more time resources including a first time resource associated with the first TRP and a second time resource associated with the second TRP.

[0188]

[0201] In some embodiments, the control message indicates a starting boundary of a window for a position of two or more time resources in the time domain. In some embodiments, the control message receiving component 1030 can be configured or otherwise support a means for receiving a control message via a downlink control channel, the control message indicating a starting boundary of a window for a last symbol of the downlink control channel in the time domain.

[0189]

[0202] In some embodiments, the receiver chain component 1055 may be configured or otherwise support a means for maintaining a first receiver chain associated with a first TRP and a second receiver chain associated with a second TRP, where the first receiver chain corresponds to a first refresh interval and the second receiver chain corresponds to a second refresh interval, and where a window duration is less than a duration of the first refresh interval and a duration of the second refresh interval.

[0190]

[0203] In some embodiments, the beam switching component 1060 may be configured or otherwise support a means for performing beam switching during a beam switching duration between receipt of the first reference signal and receipt of the second reference signal, where the duration of the window is longer than the beam switching duration.

[0191]

[0204] In some embodiments, the window includes one or more resource sets associated with two or more time resources, the one or more resource sets being based on a control message, a periodicity of the two or more time resources, an offset, a capability of the UE, or any combination thereof.

[0192]

[0205] In some embodiments, the RRC receiving component 1065 may be configured or otherwise support means for receiving an RRC signal indicating a configuration for a window.

[0193]

[0206] In some embodiments, the resource configuration indicates a resource set including a first subset of resources associated with a first TRP and a second subset of resources associated with a second TRP, and the control message indicates joint tracking between the first subset of resources and the second subset of resources.

[0194]

[0207] In some embodiments, the control message receiving component 1030 may be configured or otherwise support a means for receiving a second control message indicating separate tracking between the first subset of resources and the second subset of resources. In some embodiments, the channel estimation component 1035 may be configured or otherwise support a means for performing a first channel estimation for a first channel associated with the first TRP according to the second control message. In some embodiments, the channel estimation component 1035 may be configured or otherwise support a means for performing a second channel estimation for a second channel associated with the second TRP according to the second control message.

[0195]

[0208] In some embodiments, the control message receiving component 1030 can be configured or otherwise support a means for receiving a control signal indicating a pairing between a first resource set associated with a first TRP and a second resource set associated with a second TRP. In some embodiments, the channel estimation component 1035 can be configured or otherwise support a means for performing channel estimation for the SFN channel based on the control signal.

[0196]

[0209] In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a first reference signal over a first time resource of the two or more time resources. In some embodiments, the reference signal receiving component 1045 may be configured or otherwise support a means for receiving a second reference signal over a second time resource of the two or more time resources that does not overlap with the first time resource, the first reference signal and the second reference signal being transmitted according to a TDM configuration.

[0197]

[0210] FIG. 11 illustrates a diagram of a system 1100 including a device 1105 supporting a TRS configuration for SFN communications, according to one or more aspects of the disclosure. The device 1105 may be or may include an example of components of a device 805, a device 905, or a UE 115 as described herein. The device 1105 may wirelessly communicate with one or more network nodes 105, UEs 115, or any combination thereof. The device 1105 may include components for two-way voice and data communications, including components for transmitting and receiving communications, such as a communications manager 1120, an input / output (I / O) controller 1110, a transceiver 1115, an antenna 1125, a memory 1130, code 1135, and a processor 1140. These components may be in electronic communication or may be otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1145).

[0198]

[0211] The I / O controller 1110 may manage input and output signals for the device 1105. The I / O controller 1110 may also manage peripheral devices that are not integrated with the device 1105. In some cases, the I / O controller 1110 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 1110 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I / O controller 1110 may represent or be able to interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the I / O controller 1110 may be implemented as part of a processor, such as the processor 1140. In some cases, a user may interact with the device 1105 through the I / O controller 1110 or through hardware components controlled by the I / O controller 1110 .

[0199]

[0212] In some cases, the device 1105 may include a single antenna 1125. However, in some other cases, the device 1105 may have two or more antennas 1125, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 1115 may communicate bidirectionally via one or more antennas 1125, a wired link, or a wireless link, as described herein. For example, the transceiver 1115 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1115 may also include a modem for modulating packets and providing the modulated packets to the one or more antennas 1125 for transmission, and for demodulating packets received from the one or more antennas 1125. The transceiver 1115, or the transceiver 1115 and one or more antennas 1125, may be an example of the transmitter 815, the transmitter 915, the receiver 810, the receiver 910, or any combination or components thereof, as described herein.

[0200]

[0213] The memory 1130 may include random access memory (RAM) and read-only memory (ROM). The memory 1130 may store computer readable computer executable code 1135 including instructions that, when executed by the processor 1140, cause the device 1105 to perform various functions described herein. The code 1135 may be stored in a non-transitory computer readable medium, such as a system memory or another type of memory. In some cases, the code 1135 may not be directly executable by the processor 1140, but may (e.g., when compiled and executed) cause a computer to perform functions described herein. In some cases, the memory 1130 may include a basic I / O system (BIOS) that may control basic hardware or software operations, such as interactions with peripheral components or devices, among others.

[0201]

[0214] The processor 1140 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1140 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated with the processor 1140. The processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause the device 1105 to perform various functions (e.g., functions or tasks supporting a TRS configuration for SFN communication). For example, the device 1105 or a component of the device 1105 may include a processor 1140 and a memory 1130 coupled to the processor 1140, where the processor 1140 and the memory 1130 are configured to perform various functions described herein.

[0202]

[0215] The communication manager 1120 can support wireless communication in the UE according to embodiments disclosed herein. For example, the communication manager 1120 can be configured as or otherwise support a means for transmitting a UE capability message indicating support of the SFN configuration. The communication manager 1120 can be configured as or otherwise support a means for receiving a control message based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The communication manager 1120 can be configured as or otherwise support a means for performing channel estimation for the SFN channel associated with the at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources. The communication manager 1120 can be configured as or otherwise support a means for communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0203]

[0216] Additionally or alternatively, the communications manager 1120 may support wireless communications in the UE according to embodiments disclosed herein. For example, the communications manager 1120 may be configured as or otherwise support a means for receiving a control message indicating a resource configuration for two or more time resources associated with receiving reference signals from at least two TRPs according to the SFN configuration. The communications manager 1120 may be configured as or otherwise support a means for receiving a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration over the two or more time resources. The communications manager 1120 may be configured as or otherwise support a means for performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. The communications manager 1120 may be configured as or otherwise support a means for communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0204]

[0217] By including or configuring the communications manager 1120 according to embodiments described herein, the device 1105 can support techniques for improved communications reliability, reduced latency, more efficient utilization of communications resources, improved inter-device coordination, and reduced overhead. The device 1105 can receive a resource configuration for joint SFN channel estimation. By identifying an association between resources for SFN communications based on the resource configuration, the device 1105 can refrain from receiving dynamic control signaling, thereby supporting reduced overhead, reduced latency, and more efficient utilization of communications resources. The resource configuration can indicate resources that can be paired for SFN channel estimation, which can enable the device 1105 to perform a more accurate estimation of the SFN channel, which can improve inter-device coordination and communications reliability.

[0205]

[0218] In some embodiments, the communications manager 1120 can be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 1115, one or more antennas 1125, or any combination thereof. Although the communications manager 1120 is shown as a separate component, in some embodiments, one or more functions described with respect to the communications manager 1120 may be supported or performed by the processor 1140, the memory 1130, the code 1135, or any combination thereof. For example, the code 1135 may include instructions executable by the processor 1140 to cause the device 1105 to perform various aspects of the TRS configuration for SFN communications described herein, or the processor 1140 and the memory 1130 can be configured to perform or support such operations in other ways.

[0206]

[0219] 12 illustrates a block diagram 1200 of a device 1205 supporting a TRS configuration for SFN communications in accordance with one or more aspects of the disclosure. The device 1205 may be an example of an aspect of a network node described herein. The device 1205 may include a receiver 1210, a transmitter 1215, and a communications manager 1220. The device 1205 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0207]

[0220] The receiver 1210 may provide a means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). The information may be passed to other components of the device 1205. The receiver 1210 may utilize a single antenna or a set of multiple antennas.

[0208]

[0221] The transmitter 1215 may provide a means for transmitting signals generated by other components of the device 1205. For example, the transmitter 1215 may transmit information such as packets, user data, control information, or any combination thereof associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). In some examples, the transmitter 1215 may be collocated with the receiver 1210 in a transceiver module. The transmitter 1215 may use a single antenna or a set of multiple antennas.

[0209]

[0222] The communications manager 1220, the receiver 1210, the transmitter 1215, or various combinations or components thereof may be examples of means for performing various aspects of the TRS configuration for SFN communications described herein. For example, the communications manager 1220, the receiver 1210, the transmitter 1215, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

[0210]

[0223] In some examples, the communications manager 1220, the receiver 1210, the transmitter 1215, or various combinations or components thereof, may be implemented in hardware (e.g., in a communications management circuit). The hardware may include a processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in this disclosure. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by the processor executing instructions stored in the memory).

[0211]

[0224] Additionally or alternatively, in some embodiments, the communications manager 1220, the receiver 1210, the transmitter 1215, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communications management software or firmware). When implemented in code executed by a processor, the functions of the communications manager 1220, the receiver 1210, the transmitter 1215, or various combinations or components thereof may be performed by a general purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting a means for performing the functions described in this disclosure).

[0212]

[0225] In some embodiments, communications manager 1220 can be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with receiver 1210, transmitter 1215, or both. For example, communications manager 1220 may receive information from receiver 1210 and transmit information to transmitter 1215, or may be integrated in combination with receiver 1210, transmitter 1215, or both to receive information, transmit information, or perform various other operations described herein.

[0213]

[0226] The communication manager 1220 can support wireless communication in a network node including at least two TRPs according to embodiments disclosed herein. For example, the communication manager 1220 can be configured as or otherwise support a means for receiving a UE capability message from a UE indicating support of an SFN configuration. The communication manager 1220 can be configured as or otherwise support a means for transmitting a control message to the UE based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The communication manager 1220 can be configured as or otherwise support a means for transmitting a first reference signal of the first TRP and a second reference signal of the second TRP to the UE in one or more resources. The communication manager 1220 can be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0214]

[0227] Additionally or alternatively, the communications manager 1220 can support wireless communications in a network node including at least two TRPs according to embodiments disclosed herein. For example, the communications manager 1220 can be configured as or otherwise support a means for transmitting a control message to a UE indicating a resource configuration for two or more time resources associated with reference signal reception from at least two TRPs according to an SFN configuration. The communications manager 1220 can be configured as or otherwise support a means for transmitting a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration to the UE over the two or more time resources. The communications manager 1220 can be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP or the second TRP according to the SFN configuration.

[0215]

[0228] 13 illustrates a block diagram 1300 of a device 1305 supporting a TRS configuration for SFN communications in accordance with one or more aspects of the disclosure. The device 1305 may be an example of an aspect of the device 1205 or network node described herein. The device 1305 may include a receiver 1310, a transmitter 1315, and a communications manager 1320. The device 1305 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0216]

[0229] The receiver 1310 may provide a means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). The information may be passed to other components of the device 1305. The receiver 1310 may utilize a single antenna or a set of multiple antennas.

[0217]

[0230] The transmitter 1315 may provide a means for transmitting signals generated by other components of the device 1305. For example, the transmitter 1315 may transmit information such as packets, user data, control information, or any combination thereof associated with various traffic channels (e.g., control channels, data channels, traffic channels related to TRS configurations for SFN communications). In some embodiments, the transmitter 1315 may be collocated with the receiver 1310 within a transceiver module. The transmitter 1315 may utilize a single antenna or a set of multiple antennas.

[0218]

[0231] The device 1305 or various components thereof may be an example of a means for performing various aspects of the TRS configuration for SFN communication described herein. For example, the communications manager 1320 may include a UE capability message receiving component 1325, a control message component 1330, a reference signal transmitting component 1335, a communications component 1340, or any combination thereof. The communications manager 1320 may be an example of an aspect of the communications manager 1220 described herein. In some examples, the communications manager 1320 or various components thereof may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the receiver 1310, the transmitter 1315, or both. For example, the communications manager 1320 may receive information from the receiver 1310 and transmit information to the transmitter 1315, or may be integrated in combination with the receiver 1310, the transmitter 1315, or both to receive information, transmit information, or perform various other operations described herein.

[0219]

[0232] The communication manager 1320 can support wireless communication in a network node including at least two TRPs according to embodiments disclosed herein. The UE capability message receiving component 1325 can be configured as or otherwise support a means for receiving a UE capability message from the UE indicating support of the SFN configuration. The control message component 1330 can be configured as or otherwise support a means for transmitting a control message to the UE based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The reference signal transmitting component 1335 can be configured as or otherwise support a means for transmitting a first reference signal of the first TRP and a second reference signal of the second TRP to the UE in one or more resources. The communication component 1340 can be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0220]

[0233] Additionally or alternatively, the communication manager 1320 can support wireless communication in a network node including at least two TRPs according to embodiments disclosed herein. The control message component 1330 can be configured as or otherwise support a means for transmitting a control message to a UE indicating a resource configuration for two or more time resources associated with reference signal reception from at least two TRPs according to the SFN configuration. The reference signal transmission component 1335 can be configured as or otherwise support a means for transmitting a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration to the UE via the two or more time resources. The communication component 1340 can be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP or the second TRP according to the SFN configuration.

[0221]

[0234] 14 illustrates a block diagram 1400 of a communications manager 1420 supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. Communications manager 1420 may be an example of aspects of communications manager 1220, communications manager 1320, or both, as described herein. Communications manager 1420, or various components thereof, may be an example of a means for performing various aspects of TRS configuration for SFN communications as described herein. For example, communications manager 1420 may include a UE capability message receiving component 1425, a control message component 1430, a reference signal transmitting component 1435, a communications component 1440, or any combination thereof. Each of these components may communicate directly or indirectly with one another (e.g., via one or more buses).

[0222]

[0235] The communication manager 1420 can support wireless communication in a network node including at least two TRPs according to embodiments disclosed herein. The UE capability message receiving component 1425 can be configured as or otherwise support a means for receiving a UE capability message from the UE indicating support of the SFN configuration. The control message component 1430 can be configured as or otherwise support a means for transmitting a control message to the UE based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The reference signal transmitting component 1435 can be configured as or otherwise support a means for transmitting a first reference signal of the first TRP and a second reference signal of the second TRP to the UE in one or more resources. The communication component 1440 can be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0223]

[0236] In some embodiments, the reference signal transmission component 1435 may be configured or otherwise support a means for transmitting a first reference signal and a second reference signal to the UE on one or more resources, the one or more resources including a first time resource associated with the first TRP and a second time resource associated with the second TRP, the first time resource and the second time resource overlapping in the time domain.

[0224]

[0237] In some embodiments, the reference signal transmitting component 1435 may be configured or otherwise support a means for transmitting a first reference signal in a first time resource and a first resource element, the first reference signal being scrambled according to a first scrambling sequence associated with the first TRP. In some embodiments, the reference signal transmitting component 1435 may be configured or otherwise support a means for transmitting a second reference signal in a second time resource and a first resource element, the second reference signal being scrambled according to a second scrambling sequence associated with the second TRP, the first time resource and the second time resource corresponding to the same symbol.

[0225]

[0238] In some embodiments, the reference signal transmitting component 1435 may be configured or otherwise support a means for transmitting a first reference signal in a first time resource and a first resource element. In some embodiments, the reference signal transmitting component 1435 may be configured or otherwise support a means for transmitting a second reference signal in a second time resource and a second resource element that does not overlap with the first resource element in the frequency domain, where the first time resource and the second time resource correspond to the same symbol, and where the first reference signal and the second reference signal are transmitted according to an FDM configuration or an SDM configuration.

[0226]

[0239] Additionally or alternatively, the communications manager 1420 can support wireless communications in a network node including at least two TRPs according to embodiments disclosed herein. In some embodiments, the control message component 1430 can be configured as or otherwise support a means for transmitting a control message to a UE indicating a resource configuration for two or more time resources associated with reference signal reception from the at least two TRPs according to the SFN configuration. In some embodiments, the reference signal transmission component 1435 can be configured as or otherwise support a means for transmitting a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration to the UE over the two or more time resources. In some embodiments, the communications component 1440 can be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP or the second TRP according to the SFN configuration.

[0227]

[0240] In some embodiments, the control message indicates a window associated with two or more time resources. In some embodiments, the control message indicates a starting boundary of the window relative to a position of the two or more time resources in the time domain.

[0228]

[0241] In some embodiments, the control message component 1430 may configure or otherwise support a means for transmitting a control message over a downlink control channel, the control message indicating a starting boundary of a window for the last symbol of the downlink control channel in the time domain, in some embodiments, the duration of the window is longer than a beam switching duration associated with the beam switching performed by the UE.

[0229]

[0242] 15 illustrates a diagram of a system 1500 including a device 1505 supporting a TRS configuration for SFN communications, according to one or more aspects of the disclosure. The device 1505 may be or may include an example of components of a device 1205, a device 1305, or a network node as described herein. The device 1505 may include components for two-way voice and data communications, including components for transmitting and receiving communications, such as a communications manager 1520, a network communications manager 1510, a transceiver 1515, an antenna 1525, a memory 1530, code 1535, a processor 1540, and an inter-station communications manager 1545. These components may be in electronic communication or may be otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1550).

[0230]

[0243] The network communications manager 1510 may manage communications with the core network 130 (e.g., via one or more wired backhaul links). For example, the network communications manager 1510 may manage the transfer of data communications for client devices, such as one or more UEs 115.

[0231]

[0244] In some cases, the device 1505 may include a single antenna 1525. However, in some other cases, the device 1505 may have two or more antennas 1525, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 1515 may communicate bidirectionally via one or more antennas 1525, a wired link, or a wireless link, as described herein. For example, the transceiver 1515 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1515 may also include a modem for modulating packets and providing the modulated packets to the one or more antennas 1525 for transmission, and for demodulating packets received from the one or more antennas 1525. The transceiver 1515, or the transceiver 1515 and one or more antennas 1525, may be an example of the transmitter 1215, the transmitter 1315, the receiver 1210, the receiver 1310, or any combination or components thereof, as described herein.

[0232]

[0245] The memory 1530 may include RAM and ROM. The memory 1530 may store computer readable computer executable code 1535 including instructions that, when executed by the processor 1540, cause the device 1505 to perform various functions described herein. The code 1535 may be stored in a non-transitory computer readable medium, such as a system memory or another type of memory. In some cases, the code 1535 may not be directly executable by the processor 1540, but may (e.g., when compiled and executed) cause a computer to perform functions described herein. In some cases, the memory 1530 may include a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices, among other things.

[0233]

[0246] The processor 1540 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1540 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated with the processor 1540. The processor 1540 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause the device 1505 to perform various functions (e.g., functions or tasks supporting a TRS configuration for SFN communication). For example, the device 1505 or a component of the device 1505 may include a processor 1540 and a memory 1530 coupled to the processor 1540, where the processor 1540 and the memory 1530 are configured to perform various functions described herein.

[0234]

[0247] The inter-station communications manager 1545 may manage communications with other network nodes 105 and may include a controller or scheduler for controlling communications with the UE 115 in cooperation with the other network nodes 105. For example, the inter-station communications manager 1545 may coordinate the scheduling of transmissions to the UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some embodiments, the inter-station communications manager 1545 may provide an X2 interface in LTE / LTE-A wireless communication network technology for communicating between the network nodes 105.

[0235]

[0248] The communication manager 1520 can support wireless communication in a network node including at least two TRPs according to embodiments disclosed herein. For example, the communication manager 1520 can be configured as or otherwise support a means for receiving a UE capability message from the UE indicating support of an SFN configuration. The communication manager 1520 can be configured as or otherwise support a means for transmitting a control message to the UE based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The communication manager 1520 can be configured as or otherwise support a means for transmitting a first reference signal of the first TRP and a second reference signal of the second TRP to the UE in one or more resources. The communication manager 1520 can be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0236]

[0249] Additionally or alternatively, the communications manager 1520 may support wireless communications in a network node including at least two TRPs according to embodiments disclosed herein. For example, the communications manager 1520 may be configured as or otherwise support a means for transmitting a control message to a UE indicating a resource configuration for two or more time resources associated with reference signal reception from at least two TRPs according to an SFN configuration. The communications manager 1520 may be configured as or otherwise support a means for transmitting a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration to the UE over the two or more time resources. The communications manager 1520 may be configured as or otherwise support a means for communicating with the UE using at least one of the first TRP or the second TRP according to the SFN configuration.

[0237]

[0250] In some embodiments, the communications manager 1520 can be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 1515, one or more antennas 1525, or any combination thereof. Although the communications manager 1520 is shown as a separate component, in some embodiments, one or more functions described with respect to the communications manager 1520 may be supported or performed by the processor 1540, the memory 1530, the code 1535, or any combination thereof. For example, the code 1535 may include instructions executable by the processor 1540 to cause the device 1505 to perform various aspects of the TRS configuration for SFN communications described herein, or the processor 1540 and the memory 1530 can be configured to perform or support such operations in other ways.

[0238]

[0251] FIG. 16 illustrates a flow chart illustrating a method 1600 for supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. The operations of method 1600 may be performed by a UE or components thereof as described herein. For example, the operations of method 1600 may be performed by a UE 115 as described with reference to FIGS. 1-11. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0239]

[0252] At 1605, the method may include transmitting a UE capabilities message indicating support for the SFN configuration. The operations of 1605 may be performed in accordance with embodiments as disclosed herein. In some embodiments, aspects of the operations of 1605 may be performed by the UE capabilities message component 1025 described with reference to FIG.

[0240]

[0253] At 1610, the method may include receiving a control message based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The operations of 1610 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1610 may be performed by a control message receiving component 1030 described with reference to FIG. 10.

[0241]

[0254] At 1615, the method may include performing channel estimation for SFN channels associated with at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in one or more resources. The operations of 1615 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1615 may be performed by a channel estimation component 1035 described with reference to FIG. 10.

[0242]

[0255] At 1620, the method may include communicating with at least one of the first TRP or the second TRP according to the channel estimate. The operations of 1620 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1620 may be performed by the communication component 1040 described with reference to FIG.

[0243]

[0256] FIG. 17 illustrates a flow chart illustrating a method 1700 for supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. The operations of method 1700 may be performed by a UE or components thereof as described herein. For example, the operations of method 1700 may be performed by a UE 115 as described with reference to FIGS. 1-11. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0244]

[0257] At 1705, the method may include transmitting a UE capabilities message indicating support for the SFN configuration. The operations of 1705 may be performed in accordance with embodiments as disclosed herein. In some embodiments, aspects of the operations of 1705 may be performed by the UE capabilities message component 1025 described with reference to FIG.

[0245]

[0258] At 1710, the method may include receiving a control message based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs according to the SFN configuration, the at least two TRPs including a first TRP and a second TRP. The operations of 1710 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1710 may be performed by the control message receiving component 1030 described with reference to FIG. 10.

[0246]

[0259] At 1715, in some embodiments, the method may include receiving a first reference signal and a second reference signal at one or more resources, the one or more resources including a first time resource associated with the first TRP and a second time resource associated with the second TRP, the first time resource and the second time resource overlapping in the time domain. The operations of 1715 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1715 may be performed by a reference signal receiving component 1045 described with reference to FIG. 10.

[0247]

[0260] At 1720, the method may include performing channel estimation for SFN channels associated with at least two TRPs according to the control message, the channel estimation being based on a first reference signal of the first TRP and a second reference signal of the second TRP received in one or more resources. The operations of 1720 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1720 may be performed by a channel estimation component 1035 described with reference to FIG. 10.

[0248]

[0261] At 1725, the method may include communicating with at least one of the first TRP or the second TRP according to the channel estimate. The operations of 1725 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1725 may be performed by the communication component 1040 described with reference to FIG.

[0249]

[0262] FIG. 18 illustrates a flowchart illustrating a method 1800 for supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. The operations of method 1800 may be performed by a UE or components thereof as described herein. For example, the operations of method 1800 may be performed by a UE 115 as described with reference to FIGS. 1-11. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0250]

[0263] At 1805, the method may include receiving a control message indicating a resource configuration for two or more time resources associated with reference signal reception from at least two TRPs according to the SFN configuration. The operations of 1805 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1805 may be performed by a control message receiving component 1030 described with reference to FIG.

[0251]

[0264] At 1810, the method may include receiving a first reference signal from a first TRP of the at least two TRPs and receiving a second reference signal from a second TRP of the at least two TRPs based on a resource configuration over two or more time resources. The operations of 1810 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1810 may be performed by a reference signal receiving component 1045 described with reference to FIG.

[0252]

[0265] At 1815, the method may include performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal and the second reference signal. The operations of 1815 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1815 may be performed by a channel estimation component 1035 described with reference to FIG. 10.

[0253]

[0266] At 1820, the method may include communicating with at least one of the first TRP or the second TRP according to the channel estimate. The operations of 1820 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1820 may be performed by the communication component 1040 described with reference to FIG.

[0254]

[0267] FIG. 19 illustrates a flowchart illustrating a method 1900 for supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. The operations of method 1900 may be performed by a UE or components thereof as described herein. For example, the operations of method 1900 may be performed by a UE 115 as described with reference to FIGS. 1-11. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0255]

[0268] At 1905, the method may include receiving a control message indicating a resource configuration for two or more time resources associated with reference signal reception from at least two TRPs according to the SFN configuration. The operations of 1905 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1905 may be performed by a control message receiving component 1030 described with reference to FIG.

[0256]

[0269] At 1910, the method may include receiving a first reference signal from a first TRP of the at least two TRPs and receiving a second reference signal from a second TRP of the at least two TRPs based on a resource configuration over two or more time resources. The operations of 1910 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1910 may be performed by a reference signal receiving component 1045 described with reference to FIG.

[0257]

[0270] At 1915, in some embodiments, the method may include receiving a control signal indicating a pairing between a first resource set associated with the first TRP and a second resource set associated with the second TRP. The operations of 1915 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1915 may be performed by a control message receiving component 1030 described with reference to FIG.

[0258]

[0271] At 1920, the method may include performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based on the first reference signal, the second reference signal, and the control signal. The operations of 1920 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1920 may be performed by a channel estimation component 1035 described with reference to FIG. 10.

[0259]

[0272] At 1925, the method may include communicating with at least one of the first TRP or the second TRP according to the channel estimate. The operations of 1925 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 1925 may be performed by the communication component 1040 described with reference to FIG.

[0260]

[0273] FIG. 20 illustrates a flow chart illustrating a method 2000 of supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. The operations of method 2000 may be performed by a network node or components thereof as described herein. For example, the operations of method 2000 may be performed by a network node as described with reference to FIGS. 1-7 and 12-15. In some embodiments, the network node may execute a set of instructions to control functional elements of the network node to perform the described functions. Additionally or alternatively, the network node may perform aspects of the described functions using dedicated hardware.

[0261]

[0274] At 2005, the method may include receiving a UE capabilities message from the UE indicating support for the SFN configuration. The operations of 2005 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 2005 may be performed by a UE capabilities message receiving component 1425 described with reference to FIG.

[0262]

[0275] At 2010, the method can include transmitting a control message to the UE based on the UE capability message, the control message indicating a resource set including one or more resources for reference signal transmission from at least two TRPs according to an SFN configuration, the at least two TRPs including a first TRP and a second TRP. The operations of 2010 can be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 2010 can be performed by a control message component 1430 described with reference to FIG. 14.

[0263]

[0276] At 2015, the method may include transmitting a first reference signal of a first TRP and a second reference signal of a second TRP to the UE on one or more resources. The operations of 2015 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 2015 may be performed by a reference signal transmitting component 1435 described with reference to FIG.

[0264]

[0277] At 2020, the method may include communicating with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs. The operations of 2020 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 2020 may be performed by the communications component 1440 described with reference to FIG.

[0265]

[0278] FIG. 21 illustrates a flow chart illustrating a method 2100 of supporting TRS configuration for SFN communications in accordance with one or more aspects of the present disclosure. The operations of method 2100 may be performed by a network node or components thereof as described herein. For example, the operations of method 2100 may be performed by a network node as described with reference to FIGS. 1-7 and 12-15. In some embodiments, the network node may execute a set of instructions to control functional elements of the network node to perform the described functions. Additionally or alternatively, the network node may perform aspects of the described functions using dedicated hardware.

[0266]

[0279] At 2105, the method may include transmitting, to the UE, a control message indicating a resource configuration for two or more time resources associated with reference signal transmissions for at least two TRPs according to the SFN configuration. The operations of 2105 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 2105 may be performed by the control message component 1430 described with reference to FIG. 14.

[0267]

[0280] At 2110, the method may include transmitting a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based on the resource configuration to the UE over two or more time resources. The operations of 2110 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 2110 may be performed by a reference signal transmitting component 1435 described with reference to FIG. 14.

[0268]

[0281] At 2115, the method may include communicating with the UE using at least one of the first TRP or the second TRP according to the SFN configuration. The operations of 2115 may be performed according to embodiments as disclosed herein. In some embodiments, aspects of the operations of 2115 may be performed by the communications component 1440 described with reference to FIG.

[0269]

[0282] The following provides a summary of aspects of the disclosure.

[0283] Aspect 1: A method of wireless communication in a UE, comprising: transmitting a UE capability message indicating support of an SFN configuration; receiving a control message based at least in part on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two TRPs including a first TRP and a second TRP according to the SFN configuration; performing channel estimation for SFN channels associated with the at least two TRPs according to the control message, the channel estimation being based at least in part on a first reference signal of the first TRP and a second reference signal of the second TRP received in the one or more resources; and communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0270]

[0284] Aspect 2: The method of aspect 1, further comprising receiving a first reference signal and a second reference signal in one or more resources, the one or more resources including a first time resource associated with a first TRP and a second time resource associated with a second TRP, the first time resource and the second time resource overlapping in the time domain.

[0271]

[0285] Aspect 3: The method of aspect 2, further comprising: receiving a first reference signal at a first time resource and a first resource element; and receiving a second reference signal at a second time resource and a first resource element.

[0272]

[0286] Aspect 4: The method of aspect 2 or 3, wherein the first reference signal is scrambled according to a first scrambling sequence associated with a first ID of the first TRP, and the second reference signal is scrambled according to a second scrambling sequence associated with a second ID of the second TRP.

[0273]

[0287] Aspect 5: The method of aspect 2, further comprising: receiving a first reference signal in a first time resource and a first resource element; and receiving a second reference signal in a second time resource and a second resource element that does not overlap with the first resource element in the frequency domain.

[0274]

[0288] Example 6: The method of any one of Examples 2 and 5, wherein the first reference signal and the second reference signal are transmitted according to an FDM configuration or an SDM configuration.

[0275]

[0289] Aspect 7: The method of any one of aspects 1 to 6, wherein the resource sets include a first resource set associated with a first TRP and a second resource set associated with a second TRP, and the method further includes performing channel estimation for the SFN channel based at least in part on the first reference signal being received via the first resource set and the second reference signal being received via the second resource set, and the first resource set corresponding to the same periodicity, the same offset, or both, as the second resource set.

[0276]

[0290] Aspect 8: The method of any one of aspects 1 to 6, wherein the resource sets include a first resource set associated with a first TRP and a second resource set associated with a second TRP, the method further including: receiving a first downlink control channel that schedules a first reference signal over the first resource set and a second downlink control channel that schedules a second reference signal over the second resource set; and performing channel estimation for the SFN channel based at least in part on the first reference signal being received at a first time resource of the first resource set and the second reference signal being received at a second time resource of the second resource set that overlaps with the first time resource in the time domain.

[0277]

[0291] Aspect 9: The method of any one of aspects 1 to 8, wherein the UE capability message includes a field configured to indicate a UE capability of receiving reference signals from at least two TRPs in the same time resource according to the SFN configuration.

[0278]

[0292] Aspect 10: The method of aspect 9, wherein the UE capability message includes one or more fields different from this field, and the one or more fields indicate support for a multi-TRP communication configuration via a downlink control channel or a downlink shared channel.

[0279]

[0293] Aspect 11: The method of any one of aspects 1 to 8, further comprising: receiving a first reference signal via a first symbol and a first resource element; receiving a second reference signal via the first symbol and a second resource element, where one or more resources include the first symbol, the first resource element, and the second resource element; and transmitting a UE capability message indicating support of the SFN configuration based at least in part on a frequency offset between the first resource element and the second resource element.

[0280]

[0294] Aspect 12: A method of wireless communication in a UE, comprising: receiving a control message indicating a resource configuration for two or more time resources associated with reference signal reception from at least two TRPs according to an SFN configuration; receiving a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs based at least in part on the resource configuration over the two or more time resources; performing channel estimation for SFN channels associated with the first TRP and the second TRP according to the control message, the channel estimation being based at least in part on the first reference signal and the second reference signal; and communicating with at least one of the first TRP or the second TRP according to the channel estimation.

[0281]

[0295] Aspect 13: The method of aspect 12, wherein the control message indicates a window associated with two or more time resources, the method further including performing channel estimation for the SFN channel based at least in part on the two or more time resources being located within the window, the two or more time resources including a first time resource associated with a first TRP and a second time resource associated with a second TRP.

[0282]

[0296] Aspect 14: The method of aspect 13, wherein the control message indicates a starting boundary of a window for a position of two or more time resources in the time domain.

[0283]

[0297] Aspect 15: The method of aspect 13, further comprising receiving a control message over a downlink control channel, the control message indicating a starting boundary of a window for a last symbol of the downlink control channel in the time domain.

[0284]

[0298] Aspect 16: The method of any one of aspects 13 to 15, further comprising maintaining a first receiver chain associated with a first TRP and a second receiver chain associated with a second TRP, wherein the first receiver chain corresponds to a first refresh interval and the second receiver chain corresponds to a second refresh interval, and the duration of the window is shorter than the duration of the first refresh interval and the duration of the second refresh interval.

[0285]

[0299] Aspect 17: The method of any one of aspects 13 to 16, further comprising performing beam switching during a beam switching duration between receiving the first reference signal and receiving the second reference signal, wherein the duration of the window is longer than the beam switching duration.

[0286]

[0300] Aspect 18: The method of any one of aspects 13 to 17, wherein the window includes one or more resource sets associated with two or more time resources, and the one or more resource sets are based at least in part on a control message, a periodicity of the two or more time resources, an offset, a capability of the UE, or any combination thereof.

[0287]

[0301] Example 19: The method of any one of examples 13 to 18, further comprising receiving an RRC signal indicating a configuration for the window.

[0288]

[0302] Aspect 20: The method of any one of aspects 12 to 19, wherein the resource configuration indicates a resource set including a first subset of resources associated with a first TRP and a second subset of resources associated with a second TRP, and the control message indicates joint tracking between the first subset of resources and the second subset of resources.

[0289]

[0303] Aspect 21: The method of aspect 20, further including: receiving a second control message indicating separate tracking between a first subset of resources and a second subset of resources; performing a first channel estimation for a first channel associated with the first TRP in accordance with the second control message; and performing a second channel estimation for a second channel associated with the second TRP in accordance with the second control message.

[0290]

[0304] Aspect 22: The method of any one of aspects 12 to 19, further comprising: receiving a control signal indicating a pairing between a first resource set associated with a first TRP and a second resource set associated with a second TRP; and performing channel estimation for the SFN channel based at least in part on the control signal.

[0291]

[0305] Aspect 23: The method of any one of aspects 12 to 22, further comprising: receiving a first reference signal via a first time resource of two or more time resources; and receiving a second reference signal via a second time resource of the two or more time resources that does not overlap with the first time resource, wherein the first reference signal and the second reference signal are transmitted according to a TDM configuration.

[0292]

[0306] Aspect 24: A method of wireless communication in a network node including at least two TRPs, the method including: receiving a UE capability message from a UE indicating support of an SFN configuration; transmitting a control message to the UE based at least in part on the UE capability message, the control message indicating a resource set including one or more resources for reference signal transmission from at least two TRPs including a first TRP and a second TRP according to the SFN configuration; transmitting a first reference signal of the first TRP and a second reference signal of the second TRP to the UE on the one or more resources; and communicating with the UE using at least one of the first TRP and the second TRP according to an SFN channel associated with the at least two TRPs.

[0293]

[0307] Aspect 25: The method of aspect 24, further comprising transmitting a first reference signal and a second reference signal to the UE in one or more resources, the one or more resources including a first time resource associated with the first TRP and a second time resource associated with the second TRP, the first time resource and the second time resource overlapping in the time domain.

[0294]

[0308] Aspect 26: The method of aspect 25, further comprising: transmitting a first reference signal in a first time resource and a first resource element, the first reference signal being scrambled according to a first scrambling sequence associated with a first TRP; and transmitting a second reference signal in a second time resource and a first resource element, the second reference signal being scrambled according to a second scrambling sequence associated with a second TRP, the first time resource and the second time resource corresponding to the same symbol.

[0295]

[0309] Aspect 27: The method of aspect 25, further comprising: transmitting a first reference signal in a first time resource and a first resource element; and transmitting a second reference signal in a second time resource and a second resource element that does not overlap with the first resource element in the frequency domain, wherein the first time resource and the second time resource correspond to the same symbol, and the first reference signal and the second reference signal are transmitted according to an FDM configuration or an SDM configuration.

[0296]

[0310] Aspect 28: A method of wireless communication in a network node including at least two TRPs, the method comprising: transmitting to a UE a control message indicating a resource configuration for two or more time resources associated with reference signal transmission for the at least two TRPs according to a SFN configuration; transmitting a first reference signal from a first TRP of the at least two TRPs and a second reference signal from a second TRP of the at least two TRPs to the UE over the two or more time resources based at least in part on the resource configuration; and communicating with the UE using at least one of the first TRP or the second TRP according to the SFN configuration.

[0297]

[0311] Aspect 29: The method of aspect 28, wherein the control message indicates a window associated with two or more time resources.

[0298]

[0312] Aspect 30: The method of aspect 29, wherein the control message indicates a starting boundary of a window for a position of two or more time resources in the time domain.

[0299]

[0313] Aspect 31: The method of aspect 29, further comprising: transmitting a control message over a downlink control channel, the control message indicating a starting boundary of a window for a last symbol of the downlink control channel in the time domain.

[0300]

[0314] Aspect 32: A method as described in any one of aspects 29 to 31, wherein the duration of the window is longer than a beam switching duration associated with the beam switching performed by the UE.

[0301]

[0315] Aspect 33: An apparatus for wireless communication in a UE, comprising: a processor; and a memory coupled to the processor, the processor and the memory configured to perform a method according to any one of aspects 1 to 11.

[0302]

[0316] Aspect 34: An apparatus for wireless communication in a UE, comprising at least one means for performing the method according to any one of aspects 1 to 11.

[0303]

[0317] Aspect 35: A non-transitory computer-readable medium storing code for wireless communication in a UE, the code including instructions executable by a processor to perform a method as recited in any one of aspects 1 to 11.

[0304]

[0318] Aspect 36: An apparatus for wireless communication in a UE, comprising: a processor; and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of aspects 12 to 23.

[0305]

[0319] Aspect 37: An apparatus for wireless communication in a UE, comprising at least one means for performing the method according to any one of aspects 12 to 23.

[0306]

[0320] Aspect 38: A non-transitory computer-readable medium storing code for wireless communication in a UE, the code including instructions executable by a processor to perform a method as described in any one of aspects 12 to 23.

[0307]

[0321] Aspect 39: An apparatus for wireless communication in a network node including at least two TRPs, the apparatus comprising: a processor; and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of aspects 24 to 27.

[0308]

[0322] Aspect 40: An apparatus for wireless communication in a network node including at least two TRPs, the apparatus comprising at least one means for performing the method according to any one of aspects 24 to 27.

[0309]

[0323] Aspect 41: A non-transitory computer-readable medium storing code for wireless communication in a network node including at least two TRPs, the code including instructions executable by a processor to perform a method as described in any one of aspects 24 to 27.

[0310]

[0324] Aspect 42: An apparatus for wireless communication in a network node including at least two TRPs, the apparatus comprising: a processor; and a memory coupled to the processor, the processor and the memory configured to perform a method as described in any one of aspects 28 to 32.

[0311]

[0325] Aspect 43: An apparatus for wireless communication in a network node including at least two TRPs, the apparatus comprising at least one means for performing the method according to any one of aspects 28 to 32.

[0312]

[0326] Aspect 44: A non-transitory computer-readable medium storing code for wireless communication in a network node including at least two TRPs, the code including instructions executable by a processor to perform a method as described in any one of aspects 28 to 32.

[0313]

[0327] It should be noted that the methods described herein are descriptions of possible implementations, that the acts and steps may be rearranged or otherwise modified, and that other implementations are possible. Additionally, aspects from two or more of these methods may be combined.

[0314]

[0328] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described as examples, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used throughout much of the description, the techniques described herein may be applicable to other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0315]

[0329] The information and signals described herein may be represented using any of a wide variety of technologies and techniques. For example, the data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0316]

[0330] The various example blocks and components described with respect to the disclosure herein may be implemented or performed using a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0317]

[0331] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that parts of the functions are implemented in different physical locations.

[0318]

[0332] Computer-readable media includes both non-transitory computer storage media and communication media, including any medium that facilitates transfer of a computer program from one place to another. Non-transitory storage media may 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 may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means 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. Also, any connection is properly termed a computer-readable medium. For example, if the 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, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer readable media. As used herein, disk and disc include CDs, laser discs, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically and discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer readable media.

[0319]

[0333] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items followed by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such as, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, the phrase "based on" as used herein 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 the present disclosure. In other words, as used herein, the phrase "based on" is to be interpreted the same as the phrase "based at least in part on."

[0320]

[0334] The terms "determine" or "determining" encompass a wide variety of actions, and thus "determining" can include calculating, computing, processing, deriving, investigating, looking up (e.g., via a lookup in a table, database, or another data structure), ascertaining, and the like. "Determining" can also include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. "Determining" can also include resolving, selecting, choosing, establishing, and other similar acts.

[0321]

[0335] In the accompanying figures, similar components or features may have the same reference label. Furthermore, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes between the similar components. If only a first reference label is used herein, the description is applicable to any of the similar components having the same first reference label, regardless of the second reference label, or other subsequent reference labels.

[0322]

[0336] The description set forth herein with respect to the accompanying drawings describes exemplary configurations and does not necessarily represent all examples that may be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not mean "preferred" or "advantageous over other examples." The detailed description includes specific details for the purposes of providing an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0323]

[0337] The description herein is provided to enable any person skilled in the art to make or use the disclosure. Various modifications of the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. 1. An apparatus for wireless communication in a user equipment (UE), comprising: a processor; a memory coupled to the processor; wherein the processor and the memory Sending a UE capability message indicating support for a single frequency network configuration; receiving a control message based at least in part on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two transmission and reception points, including a first transmission and reception point and a second transmission and reception point according to the single frequency network configuration; performing channel estimation for a single-frequency network channel associated with the at least two transmitting and receiving points according to the control message, the channel estimation being based at least in part on a first reference signal of the first transmitting and receiving point and a second reference signal of the second transmitting and receiving point received on the one or more resources; receiving the first reference signal via a first symbol and a first resource element; receiving the second reference signal via the first symbol and a second resource element, the one or more resources including the first symbol, the first resource element, and the second resource element; transmitting the UE capability message indicating the support for the single frequency network configuration based at least in part on a frequency offset between the first resource elements and the second resource elements; communicating with at least one of the first transmission / reception point or the second transmission / reception point according to the channel estimation; It is configured as follows: Device.

2. 2. The apparatus of claim 1, wherein the UE capability message comprises a field configured to indicate a UE capability of receiving reference signals from the at least two transmission / reception points in the same time resource according to the single frequency network configuration.

3. 3. The apparatus of claim 2, wherein the UE capability message includes one or more fields different from the field, the one or more fields indicating support for a multi-transmit / receive point communication configuration over a downlink control channel or a downlink shared channel.

4. 1. An apparatus for wireless communication in a network node, comprising: at least two transmitting and receiving points; a processor; a memory coupled to the processor; wherein the processor and the memory receiving a UE capability message from a user equipment (UE) indicating support for a single frequency network configuration; sending a control message to the UE based at least in part on the UE capability message, the control message indicating a resource set comprising one or more resources for reference signal transmission from the at least two transmission and reception points comprising a first transmission and reception point and a second transmission and reception point according to the single frequency network configuration; transmitting a first reference signal of the first transmission / reception point and a second reference signal of the second transmission / reception point to the UE in the one or more resources, the first reference signal being transmitted via a first symbol and a first resource element, and the second reference signal being transmitted via the first symbol and a second resource element, the one or more resources including the first symbol, the first resource element, and the second resource element; receiving the UE capability message indicating the support for the single frequency network configuration based at least in part on a frequency offset between the first resource elements and the second resource elements; communicating with the UE using at least one of the first transmission / reception point and the second transmission / reception point according to a single frequency network channel associated with the at least two transmission / reception points; It is configured as follows: Device.

5. A method for wireless communication in a user equipment (UE), comprising: transmitting a UE capability message indicating support for a single frequency network configuration; receiving a control message based at least in part on the UE capability message, the control message indicating a resource set including one or more resources for reference signal reception from at least two transmission and reception points including a first transmission and reception point and a second transmission and reception point according to the single frequency network configuration; performing channel estimation for a single frequency network channel associated with the at least two transmitting and receiving points according to the control message, the channel estimation being based at least in part on a first reference signal of the first transmitting and receiving point and a second reference signal of the second transmitting and receiving point received on the one or more resources; receiving the first reference signal over a first symbol and a first resource element; receiving the second reference signal via the first symbol and a second resource element, and the one or more resources including the first symbol, the first resource element, and the second resource element; transmitting the UE capability message indicating the support for the single frequency network configuration based at least in part on a frequency offset between the first resource elements and the second resource elements; communicating with at least one of the first transmission / reception point or the second transmission / reception point according to the channel estimation; A method comprising:

6. A method for wireless communication in a network node having at least two transmitting and receiving points, comprising: receiving a UE capability message from a user equipment (UE) indicating support for a single frequency network configuration; sending a control message to the UE based at least in part on the UE capability message, the control message indicating a resource set comprising one or more resources for reference signal transmission from the at least two transmission and reception points comprising a first transmission and reception point and a second transmission and reception point according to the single frequency network configuration; transmitting a first reference signal of the first transmission / reception point and a second reference signal of the second transmission / reception point to the UE in the one or more resources, the first reference signal being transmitted via a first symbol and a first resource element, and the second reference signal being transmitted via the first symbol and a second resource element, the one or more resources including the first symbol, the first resource element, and the second resource element; receiving the UE capability message indicating the support for the single frequency network configuration based at least in part on a frequency offset between the first resource elements and the second resource elements; communicating with the UE using at least one of the first transmission / reception point and the second transmission / reception point according to a single frequency network channel associated with the at least two transmission / reception points; A method comprising:

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