Methods and apparatuses for wireless communication at a UE and a TRP

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may send a message to a transmission reception point (TRP) in a multi-TRP network, the message indicating the UE's capabilities to support communication schemes (e.g., spatial division multiplexing (SDM) scheme, single frequency network (SFN) scheme, combined SDM and SFN scheme, etc.). The UE may receive a configuration indicating parameters common to the SDM scheme and the SFN scheme. The TRP may send an indication of an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, etc. for communication between the UE and one or more TRPs to the UE. The UE may communicate with one or more TRPs based on the communication scheme indicated by the TRP.

Description

[0001] Cross-reference

[0002] This patent application claims the benefit of the following applications: U.S. Provisional Patent Application No. 63 / 108,787, filed Nov. 2, 2020, by NAM et al. and entitled "TECHNIQUES FOR CONFIGURING MULTI-TRANSMISSION RECEPTION POINT COMMUNICATION SCHEMES"; and U.S. Patent Application No. 17 / 513,555, filed Oct. 28, 2021, by NAM et al. and entitled "TECHNIQUES FOR CONFIGURING MULTI-TRANSMISSION RECEPTION POINT COMMUNICATION SCHEMES"; each of the above applications is assigned to the assignee of the present application. Field of the Invention

[0003] The following relates to wireless communication, including techniques for configuring multi-transmission reception point (multi-TRP) communication schemes. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasting, etc. 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 multi-access systems include fourth-generation (4G) systems (e.g., Long Term Evolution (LTE) systems, Advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multi-access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices (which may also be referred to as user equipment (UE)). Summary of the Invention

[0005] The described technology relates to improved methods, systems, devices, and apparatuses that support techniques for configuring multi-transmit receive point (multi-TRP) communication schemes. Generally speaking, the described technology provides a user equipment (UE) with the ability to send a message to a TRP in a multi-TRP network indicating the UE's support for a communication scheme (e.g., a spatial division multiplexing (SDM) scheme, a single frequency network (SFN) scheme, a combined SDM and SFN scheme, etc.). The UE may receive a configuration indicating parameters that are common to both the SDM scheme and the SFN scheme. In some cases, the TRP may send an indication to the UE of an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, etc. for communication between the UE and one or more TRPs. For example, the indication may include one or more parameters specific to the SDM scheme, the SFN scheme, the combined SDM and SFN scheme, etc. In some examples, the UE may communicate with one or more TRPs based on the communication scheme indicated by the TRP. For example, the UE may receive signaling from the TRP and may adapt the processing of the received signaling (e.g., the channel estimation process) based on the indicated communication protocol.

[0006] A method for wireless communication at a UE is described. The method may include: receiving a configuration indicating parameters for an SDM scheme and an SFN scheme for communication with multiple TRPs supported by the UE, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; receiving an indication of a communication scheme for the UE to use for communication with the multi-TRP, the communication scheme including an SDM scheme, an SFN scheme, or a combination of the SDM scheme and the SFN scheme; and communicating with the multi-TRP using the received configuration's parameters corresponding to the indicated communication scheme.

[0007] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receive a configuration indicating parameters for an SDM scheme and an SFN scheme for communication with multiple TRPs supported by the UE, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; receive an indication of a communication scheme for the UE to use for communication with the multi-TRP, the communication scheme including an SDM scheme, an SFN scheme, or a combination of the SDM scheme and the SFN scheme; and communicate with the multi-TRP using the received configuration's parameters corresponding to the indicated communication scheme.

[0008] Describes another apparatus for wireless communication at a UE. The apparatus may include: a unit for receiving a configuration indicating parameters for a SDM scheme and a SFN scheme for communication with multiple TRPs supported by the UE, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; a unit for receiving an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including the SDM scheme, the SFN scheme, or a combination of the SDM scheme and the SFN scheme; and a unit for communicating with multiple TRPs using the received configuration's parameters corresponding to the indicated communication scheme.

[0009] Describes a non-transitory computer-readable medium storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive a configuration indicating parameters for a SDM scheme and a SFN scheme for communication with multiple TRPs supported by the UE, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; receive an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including the SDM scheme, the SFN scheme, or a combination of the SDM scheme and the SFN scheme; and communicate with multiple TRPs using the received configuration's parameters corresponding to the indicated communication scheme.

[0010] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: sending a message indicating the UE's ability to support the SDM scheme and the SFN scheme for communication with multiple TRPs.

[0011] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: determining a second set of parameters for communication with multiple TRPs, the second set of parameters being specific to a configuration-based communication scheme; and communicating with multiple TRPs based on the first set of parameters and the second set of parameters.

[0012] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: receiving an indication of the second set of parameters in the configuration.

[0013] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the message sending an indication of capabilities may include operations, features, units, or instructions for performing the following: sending a set of capabilities for one or both of an SDM scheme and an SFN scheme, the set of capabilities including: the number of spatial quasi co-location (QCL) assumptions or beams that can be maintained by a UE, the number of transmission configuration indicator (TCI) states supported by the UE, the number of TCI code points supported by the UE, or any combination thereof.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: receiving signaling from a multi-TRP, a network node, or both, according to one or both of a configuration-based SDM scheme and an SFN scheme.

[0015] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: determining one or both of a configurability value or the number of demodulation reference signal (DMRS) ports from each TRP in a multi-TRP, based on a communication scheme, wherein the signaling may be received based on the configurability value or the number of DMRS ports.

[0016] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: performing channel estimation on the signaling using a plurality of sets of DMRS ports, based on a configuration indicating an SDM scheme, each set of DMRS ports in the plurality of sets of DMRS ports corresponding to a respective TRP in the multi-TRP.

[0017] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: performing channel estimation using a common set of DMRS ports, based on a configuration indicating a first type of SFN scheme, the common set of DMRS ports being common across the multi-TRP.

[0018] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: performing channel estimation using a plurality of sets of DMRS ports, based on a configuration indicating a second type of SFN scheme, each set of DMRS ports in the plurality of sets of DMRS ports corresponding to a respective TRP in the multi-TRP.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: identifying multiple TRPs for communication based on two or more TCI states being mapped to TCI code points for a UE.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: determining a communication scheme based on an association between a set of parameters indicated in a configuration and a communication scheme.

[0021] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, receiving an indication of a communication scheme may include operations, features, units, or instructions for performing the following: receiving an indication of a communication scheme in a mode indicator field of a radio resource control (RRC) message.

[0022] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, receiving an indication of a communication scheme may include operations, features, units, or instructions for performing the following: receiving a downlink control information (DCI) message including an indication of a communication scheme.

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, an indication of a communication scheme includes an explicit indication in a DCI message.

[0024] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, an indication of a communication scheme includes a value of a time domain resource allocation table field for an entry of a time domain resource allocation table indicating that an indication for a DCI message may be associated with a communication scheme.

[0025] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, an indication of a communication scheme includes a value of a TCI field in a DCI message indicating a set of multiple TCI states.

[0026] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: determining that a communication scheme includes an SDM scheme based on an antenna port field of a DCI message indicating a set of multiple code division multiplexing (CDM) groups.

[0027] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: determining that a communication scheme includes an SFN scheme based on an antenna port field of a DCI message indicating a single CDM group.

[0028] Describes a method for wireless communication at a TRP. The method may include: sending to a UE a configuration indicating parameters for a spatial division multiplexing (SDM) scheme and a single frequency network (SFN) scheme supported by the UE for communication with multiple TRPs, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; and sending to the UE an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme.

[0029] Describes an apparatus for wireless communication at a TRP. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to perform the following operations: sending to a UE a configuration indicating parameters for an SDM scheme and an SFN scheme supported by the UE for communication with multiple TRPs, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; and sending to the UE an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme.

[0030] Describes another apparatus for wireless communication at a TRP. The apparatus may include: a unit for sending to a UE a configuration indicating parameters for an SDM scheme and an SFN scheme supported by the UE for communication with multiple TRPs, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; and a unit for sending to the UE an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme.

[0031] Describes a non-transitory computer-readable medium storing code for wireless communication at a TRP. The code may include instructions executable by a processor to perform the following operations: sending to a UE a configuration indicating parameters for an SDM scheme and an SFN scheme supported by the UE for communication with multiple TRPs, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme; and sending to the UE an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme.

[0032] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operation: receiving from a UE a message indicating the UE's capabilities to support an SDM scheme and an SFN scheme for communication with multiple TRPs.

[0033] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining a first set of parameters for communication between a UE and multiple TRPs based on capabilities; and determining a second set of parameters for communication between the UE and multiple TRPs based on capabilities, the second set of parameters being specific to a communication scheme.

[0034] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, receiving a message indicating capabilities may include operations, features, units, or instructions for: receiving a set of capabilities for one or both of an SDM scheme and an SFN scheme, the set of capabilities including: the number of spatial QCL assumptions or beams that can be maintained by the UE, the number of TCI states supported by the UE, the number of TCI code points supported by the UE, or any combination thereof.

[0035] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining at least one parameter of parameters for a communication scheme based on: the number of spatial QCL assumptions or beams that can be maintained by the UE, the number of TCI states supported by the UE, the number of TCI code points supported by the UE, or any combination thereof.

[0036] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending signaling to the UE according to a configuration-based communication scheme.

[0037] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining one or both of a configurability value or the number of DMRS ports for each TRP in multiple TRPs based on a communication scheme, wherein the signaling may be sent based on the configurability value or the number of DMRS ports.

[0038] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, sending an indication of a communication scheme may include operations, features, units, or instructions for: sending an indication of the communication scheme in a mode indicator field of an RRC message.

[0039] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, sending an indication of a communication scheme may include operations, features, units, or instructions for: receiving a DCI message including an indication of the communication scheme.

[0040] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the indication of the communication scheme includes an explicit indication in a DCI message.

[0041] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the indication of the communication scheme includes the value of a time-domain resource allocation table field for an entry in a time-domain resource allocation table where the indication for the DCI message can be associated with the communication scheme.

[0042] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the indication of the communication scheme includes the value of a TCI field in a DCI message that indicates a set of multiple TCI states.

[0043] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI message further includes an antenna port field that indicates a set of multiple CDM groups to indicate that the communication scheme includes an SDM scheme.

[0044] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI message further includes an antenna port field that indicates a single CDM group to indicate that the communication scheme includes an SDM scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 and Figure 2 show examples of wireless communication systems that support techniques for configuring multi-transmit receive point (TRP) communication schemes in accordance with aspects of the present disclosure.

[0046] Figure 3 and Figure 4 show examples of communication scheme diagrams that support techniques for configuring multi-TRP communication schemes in accordance with aspects of the present disclosure.

[0047] Figure 5 show examples of process flows that support techniques for configuring multi-TRP communication schemes in accordance with aspects of the present disclosure.

[0048] Figure 6 and Figure 7 show block diagrams of devices that support techniques for configuring multi-TRP communication schemes in accordance with aspects of the present disclosure.

[0049] Figure 8 show block diagrams of communication managers that support techniques for configuring multi-TRP communication schemes in accordance with aspects of the present disclosure.

[0050] Figure 9A diagram of a system including an apparatus supporting techniques for configuring a multi-TRP communication scheme, in accordance with aspects of the present disclosure.

[0051] Figure 10 and Figure 11 A block diagram of an apparatus supporting techniques for configuring a multi-TRP communication scheme, in accordance with aspects of the present disclosure.

[0052] Figure 12 A block diagram of a communication manager supporting techniques for configuring a multi-TRP communication scheme, in accordance with aspects of the present disclosure.

[0053] Figure 13 A diagram of a system including an apparatus supporting techniques for configuring a multi-TRP communication scheme, in accordance with aspects of the present disclosure.

[0054] Figures 14 to 17 A flowchart illustrating a method supporting techniques for configuring a multi-TRP communication scheme, in accordance with aspects of the present disclosure. DETAILED DESCRIPTION

[0055] In some wireless communication systems, multiple transmit and receive points (multi-TRP) may communicate with one or more user equipment (UE) using a communication scheme. In some examples, the communication scheme may include a time division multiplexing (TDM) scheme, a frequency division multiplexing (FDM) scheme, a space division multiplexing (SDM) scheme, or a combination. Additionally or alternatively, the UE may implement a single frequency network (SFN) scheme, where multiple transmitters (e.g., TRP) may transmit the same transmission signal on the same frequency channel, which may be useful in applications involving high mobility UEs such as high-speed trains. Further, for some service types such as broadcast or multicast services, the SFN scheme may be useful. In some examples, the SFN scheme may include a first type of SFN scheme, a second type of SFN scheme, or both (e.g., related to whether demodulation reference signals (DMRS) for a downlink control channel, a downlink shared channel, or both can be transmitted in an SFN manner). However, the UE may not know which communication scheme to implement or may not know the relevant configuration and signaling for that communication scheme.

[0056] As described herein, a UE may send a message indicating the UE's ability to support a communication scheme (such as an SDM scheme, an SFN scheme, or a combined SFN and SDM scheme) for communication with multiple TRPs (e.g., which may be operating as a base station, a network node, or both). The message may include capability information, such as the number of active transmission configuration indicator (TCI) states supported by the UE, the number of potential TCI code points for the communication scheme supported by the UE, the number of spatial quasi - co - location (QCL) assumptions or beams that the UE is capable of maintaining for processing in a frequency range, or a combination thereof. In some examples, the UE may receive a configuration for the communication scheme from a TRP among the multiple TRPs based on the indicated capabilities. For example, the TRP may send a configuration identifying an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, and / or another communication scheme to the UE based on the capability information. In some examples, the TRP may then send an indication of the configuration as a field in control signaling (e.g., in radio resource control (RRC) signaling or in a downlink control information (DCI) message). The UE may adapt the processing of the received signal based on the identified communication scheme. For example, the UE may perform channel estimation using a common set or a separate set of DMRS ports based on the indicated communication scheme (e.g., an SDM scheme, an SFN scheme and the type of the SFN scheme, or a combined SDM and SFN scheme).

[0057] Although this document refers to an SFN scheme, the techniques discussed may also be referred to as a single - frequency communication scheme, or other communication schemes that use a single - frequency signal to communicate with multiple transmitters (transmitting to or receiving from multiple transmitters), or use such other communication schemes.

[0058] Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are further described in the context of communication scheme diagrams and process flows. Aspects of the present disclosure are further illustrated by apparatus diagrams, system diagrams, and flowcharts related to techniques for configuring multi - TRP communication schemes, and aspects of the present disclosure are described with reference to these diagrams.

[0059] Figure 1FIG. 0 shows an example of a wireless communication system 100 that supports techniques for configuring a multi-transmit receive point communication scheme in accordance with aspects of the present disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an evolved LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission critical) communication, low latency communication, communication with low cost and low complexity devices, or any combination thereof.

[0060] The base stations 105 may be spread across a geographic area to form the wireless communication system 100, and may be devices of different forms or having different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110, and the UEs 115 and the base stations 105 may establish one or more communication links 125 over the coverage area 110. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support the transmission of signals according to one or more radio access technologies.

[0061] The UEs 115 may be spread across the entire coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices of different forms or having different capabilities. In Figure 1 FIG. 8 shows some example UEs 115. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), as Figure 1 shown.

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

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

[0064] The UE 115 may include or may be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, where the "device" may also be referred to as a unit, station, terminal, or client, among other examples. The UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, the UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine type communication (MTC) device, among other examples, which may be implemented in various items such as appliances, or vehicles, meters, and other examples.

[0065] The UE 115 described herein may be capable of communicating with various types of devices, such as other UE 115s that may sometimes act as repeaters, as well as base stations 105 and network devices (including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples), as Figure 1 shown.

[0066] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 over 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 link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating the operation of 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. According to a carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0067] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have control signaling that obtains signaling or coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be placed according to a channel raster for discovery by the UE 115. A carrier may operate in a stand-alone mode where the UE 115 performs initial acquisition and connection via the carrier, or the carrier may operate in a non-stand-alone mode where a different carrier (e.g., of the same or a different radio access technology) is used to anchor the connection.

[0068] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communication (e.g., in an FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in a TDD mode).

[0069] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or the wireless communication system 100. For example, the carrier bandwidth may be one of a number of defined bandwidths for a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (e.g., the base station 105, the UE 115, or both) may have a hardware configuration that supports communication on a specific 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 base station 105 or a UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a sub-band, a BWP) or all of a carrier bandwidth.

[0070] The signal waveform transmitted on a carrier can be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread spectrum OFDM (DFT-S-OFDM)). In a system adopting MCM techniques, a resource element can include a symbol period (e.g., the duration of a modulated symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the decoding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate for UE 115 can be. Wireless communication resources can 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 can further increase the data rate or data integrity for communication with UE 115.

[0071] One or more numerologies for a carrier can be supported, where a numerology can include a subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different numerologies. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be restricted to one or more active BWPs.

[0072] It can be represented in multiples of a basic time unit (which can, for example, refer to a sampling period of F s = 1 / (Δf max ·N f ) seconds, where Δf max can represent the maximum supported subcarrier spacing, and N f can represent the maximum supported discrete Fourier transform (DFT) size) to represent the time interval for base station 105 or UE 115. The time intervals of communication resources can be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0073] Each frame may include a plurality of consecutively numbered sub - frames or time slots, and each sub - frame or time slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into sub - frames, and each sub - frame may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the sub - carrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix added in front of each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini - time slots each containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f f

[0074] sub - frames, time slots, mini - time slots, or symbols may be the smallest scheduling units (e.g., in the time domain) of the wireless communication system 100 and may be referred to as transmission time intervals (TTIs). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in the form of a burst of shortened TTIs (sTTIs)).

[0075] Physical channels may be multiplexed on a carrier according to various techniques. For example, time - division multiplexing (TDM) techniques, frequency - division multiplexing (FDM) techniques, or one or more of hybrid TDM - FDM techniques may be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by the 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., CORESETs) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate 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 set may include a common search space set configured to send control information to a plurality of UEs 115 and a UE - specific search space set for sending control information to a particular UE 115.

[0076] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity for communication (e.g., on a carrier) with the base station 105, and may be associated with an identifier (e.g., physical cell identifier (PCID), virtual cell identifier (VCID), or other identifier) for differentiating adjacent cells. In some examples, a cell may also refer to the geographical coverage area 110 or a portion (e.g., a sector) of the geographical coverage area 110 on which the logical communication entity operates. Depending on various factors (such as the capabilities of the base station 105), the range of such a cell may vary from a relatively small area (e.g., a structure, a subset of a structure) to a relatively large area. For example, a cell may be or include a building, a subset of a building, or an outdoor space between or overlapping with the geographical coverage area 110, among other examples.

[0077] Macro cells typically cover a relatively large geographical area (e.g., with a radius of several kilometers) and may allow unrestricted access by UEs 115 having a service subscription with the network provider that supports the macro cell. In comparison with macro cells, small cells may be associated with lower-power base stations 105, and small cells may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to UEs 115 having a service subscription with the network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a residence or an office). The base station 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0078] In some examples, a carrier may support multiple cells and may be configured with different cells according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access for different types of devices.

[0079] In some examples, the base station 105 can be movable, and thus, provides communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, but different geographic coverage areas 110 can be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies can be supported by different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous network where different types of base stations 105 use the same or different radio access technologies to provide coverage for respective geographic coverage areas 110.

[0080] The wireless communication system 100 can support synchronous operation or asynchronous operation. For synchronous operation, the base stations 105 can have similar frame timings, and transmissions from different base stations 105 can be approximately aligned in time. For asynchronous operation, the base stations 105 can have different frame timings, and in some examples, transmissions from different base stations 105 can not be aligned in time. The techniques described herein can be used for synchronous operation or asynchronous operation.

[0081] Some UEs 115 (e.g., MTC or IoT devices) can be low-cost or low-complexity devices, and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with the base station 105 without human intervention. In some examples, M2M communication or MTC can include communication from devices integrated with sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents the information to a human interacting with the application. Some UEs 115 can be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, device monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business billing.

[0082] Some UEs 115 may be configured to operate in a power-reduced mode of operation, e.g., half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power-saving techniques for the UE 115 include entering a power-saving deep sleep mode when not participating in active communication, when operating on a limited bandwidth (e.g., according 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 extent (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of the carrier, or external to the carrier.

[0083] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. The UE 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication 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 prioritization of services, and 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.

[0084] In some examples, the UE 115 may also be capable of communicating directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0085] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as a roadside unit) or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or perform both operations.

[0086] The core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), which can 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 to or interconnects with an external network. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for a UE 115 served by a base station 105 associated with the core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can be connected to an IP service 150 for one or more network operators. The IP service 150 can include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0087] Some network devices in the network device (e.g., base station 105) can include a subcomponent such as an access network entity 140, which can be an example of an access node controller (ANC). Each access network entity 140 can communicate with a UE 115 through one or more other access network transmission entities 145 (which can be referred to as a radio head, a smart radio head, or a transmit / receive point (TRP)). Each access network transmission entity 145 can include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 can be distributed across various network devices (e.g., radio head and ANC) or combined into a single network device (e.g., base station 105).

[0088] 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). Generally, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or the decimeter band because the wavelength range is approximately from one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may be sufficient to penetrate structures for a macro cell to serve a UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, UHF wave transmissions may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers).

[0089] The wireless communication system 100 may also operate in the super-high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also referred to as the centimeter band) or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as the millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be smaller and more closely spaced compared to UHF antennas. In some examples, this may facilitate the use of antenna arrays within the devices. However, EHF transmissions may suffer even greater atmospheric attenuation and shorter distances compared to SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the designation of frequency bands across these frequency regions may vary according to the country or regulatory body.

[0090] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed-assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency 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 base station 105 and the UE 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation in an unlicensed frequency band may be based on a carrier aggregation configuration that combines component carriers operating in a licensed frequency band (e.g., LAA). Operation in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer (P2P) transmissions, or device-to-device (D2D) transmissions, among other examples.

[0091] The base station 105 or the UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or the UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having a number of rows and columns of antenna ports that the base station 105 may use to support beamforming for 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 panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0092] The base station 105 or the UE 115 may use MIMO communications to take advantage of multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such a technique may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals 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 associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) (where multiple spatial layers are transmitted to the same receiving device) and multi-user MIMO (MU-MIMO) (where multiple spatial layers are transmitted to multiple devices).

[0093] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., base station 105, UE 115) to form or direct an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via the antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signals transmitted via the antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustment associated with each antenna element in the antenna elements can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0094] As part of the beamforming operation, the base station 105 or the UE 115 can use beam scanning techniques. For example, the base station 105 can use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. The base station 105 can transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 can transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions can be used (e.g., by the transmitting device such as the base station 105 or by the receiving device such as the UE 115) to identify the beam direction for subsequent transmissions or receptions by the base station 105.

[0095] The base station 105 can transmit some signals (e.g., data signals associated with that receiving device) in a single beam direction (e.g., the direction associated with a particular receiving device (e.g., UE 115)). In some examples, the beam direction associated with the transmission along a single beam direction can be determined based on the signals transmitted in one or more beam directions. For example, the UE 115 can receive one or more of the signals transmitted by the base station 105 in different directions and can report an indication to the base station 105 of the signal that has the highest signal quality or otherwise acceptable signal quality received by the UE 115.

[0096] In some examples, multiple beam directions can be used to perform transmissions by a device (e.g., by base station 105 or UE 115), and the device can use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from base station 105 to UE 115). UE 115 can report feedback indicating precoding weights for one or more beam directions, and the feedback can correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 can transmit reference signals that can be precoded or not precoded (e.g., cell-specific reference signal (CRS), channel state information reference signal (CSI-RS)). UE 115 can provide feedback for beam selection, which can 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 base station 105 in one or more directions, UE 115 can employ similar techniques to transmit signals multiple times in different directions (e.g., for identifying beam directions for subsequent transmissions or receptions by UE 115) or to transmit signals in a single direction (e.g., for transmitting data to a receiving device).

[0097] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, a receiving device (e.g., UE 115) can attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device can receive by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (e.g., different sets of directional listening weights), or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (any of the above operations can be referred to as "listening" according to different receiving configurations or receiving directions), thereby attempting multiple receiving directions. In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receiving configuration can be aligned in a beam direction determined based on listening according to different receiving configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0098] The wireless communication system 100 can be a packet-based network that operates according to a hierarchical protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly for transmission over logical channels. The media access control (MAC) layer can perform priority handling and multiplexing of logical channels onto transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer can provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between the UE 115 and the base station 105 or the core network 130. At the physical layer, the transport channels can be mapped to physical channels.

[0099] The UE 115 and the base station 105 can support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received over the communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions). In some examples, a device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in previous symbols in a particular slot within that slot. In other cases, the device can provide HARQ feedback in a subsequent slot or according to some other time interval.

[0100] In some examples, one or more TRPs (e.g., multiple TRPs) may communicate with UE 115 using a communication scheme such as an SDM scheme, an FDM scheme, a TDM scheme, or a combination. Additionally or alternatively, the TRP may use an SFN scheme to perform joint transmission to UE 115, and the SFN scheme may also be referred to as a single-frequency communication scheme. The SFN scheme may be a type of multi-TRP or single-TRP communication scheme in which the downlink frequency band or channel is shared among the TRPs. In some cases, the frameworks of the SDM scheme and the SFN scheme may be unified such that UE 115 can support a combined SDM and SFN scheme. For example, UE 115 may use the SDM scheme or the SFN scheme to transmit signaling based on DMRS ports and TCI states. In some examples, there may be one or more common features, common parameters, or both between the communication schemes. For example, the SFN scheme may share one or more parameters with the SDM scheme. In some examples, the network (e.g., including one or more TRPs, base station 105, one or more UEs 115, or a combination) may support multi-TRP communication, single-TRP communication, or both. In some examples of multi-TRP communication, the TRPs may communicate with one or more UEs 115 using different communication schemes (e.g., an SDM scheme, an SFN scheme, or a combined SDM and SFN scheme) to improve spectral efficiency. However, UE 115 may not know which communication scheme to implement or the relevant configurations and signaling for that communication scheme.

[0101] In some examples, the UE 115 may send a message to a TRP in a multi-TRP network indicating the UE 115's ability to support a communication scheme (e.g., SDM scheme, SFN scheme, combined SDM and SFN scheme, etc.). In some examples, the capability message may include components such as the number of active TCI states supported by the UE 115, the number of TCI code points that the UE 115 can support for the communication scheme, and the number of simultaneous spatial QCL assumptions or beams that the UE 115 is capable of maintaining. The UE 115 may receive a configuration indicating parameters common to both the SDM scheme and the SFN scheme. In some cases, the UE 115 may receive an indication of the communication scheme to be used for communication from the TRP. For example, the TRP may indicate an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, etc. for the UE 115 to use for communication between the UE 115 and one or more TRPs. For example, the indication may include one or more parameters specific to the SDM scheme, the SFN scheme, the combined SDM and SFN scheme, etc. In some examples, the UE 115 may communicate with one or more TRPs based on the communication scheme indicated by the TRP. For example, the UE 115 may receive signaling from the TRP and may adapt the processing of the received signaling (e.g., the channel estimation process) based on the indicated communication scheme.

[0102] Figure 2 FIG. shows an example of a wireless communication system 200 that supports techniques for configuring a multi-TRP communication scheme in accordance with aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100 and may include a UE 115-a, a communication link 125-a through a communication link 125-d, and a base station 105-a having a coverage area 110-a, which may be as described with reference to Figure 1Example of the described UE 115, communication link 125, and base station 105 with coverage area 110. In some examples, one or more TRPs 205 (such as TRP 205-a, TRP 205-b, or both) may be operating as the base station 105, network node, or both. For example, TRP 205-a may relay signals between UE 115-a and base station 105-a (e.g., via communication link 125-a, downlink communication link 210, uplink communication link 215, or both), or may independently transmit or receive signals from UE 115-a (e.g., via downlink communication link 210, uplink communication link 215, or both). Similarly, TRP 205-b may relay signals between UE 115-a and base station 105-a (e.g., via communication link 125-b, communication link 125-c, or both), or may independently transmit or receive signals from UE 115-a (e.g., via communication link 125-c). In some cases, UE 115-a may send a message to TRP 205-a via uplink communication link 215, the message indicating the ability of UE 115-a to support a communication scheme (e.g., SDM scheme, SFN scheme, combined SDM and SFN scheme, etc.), and may receive a configuration for communicating according to the communication scheme from TRP 205-a via downlink communication link 210.

[0103] In some examples, the TRP 205 may communicate with one or more UEs 115 using a communication scheme such as an SDM scheme, FDM scheme, TDM scheme, or a combination thereof. The TRP 205 may coordinate the transmission of downlink channels (e.g., physical downlink shared channel (PDSCH), physical downlink control channel (PDCCH), or both), uplink channels (e.g., physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), or both), or both. For example, the SDM scheme may involve TRP 205-a and TRP 205-b performing joint transmission 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) with different TCI states, which will be referred to Figure 3For further details. Additionally or alternatively, the FDM scheme may involve TRP 205-a and TRP 205-b performing joint transmission on different frequency resources and overlapping time resources (e.g., on different sets of resource elements but on the same set of OFDM symbols) based on transmitting different sets of frequency-domain resources with different TCI states (e.g., resource elements). In some examples of the TDM scheme, TRP 205-a and TRP 205-b may perform joint transmission on different time resources and overlapping frequency resources (e.g., on different sets of OFDM symbols and overlapping sets of resource elements) based on transmitting different sets of time-domain resources with different TCI states (e.g., OFDM symbols, time slots, or mini-slots).

[0104] In some examples, TRP 205-a and TRP 205-b may use the SFN scheme to perform joint transmission to UE 115-a, and the SFN scheme may also be referred to as a single-frequency communication scheme. The SFN scheme may be a type of multi-TRP or single-TRP communication scheme, where the downlink communication link 210 and the downlink portion of the communication link 125-c may include the same frequency band or channel. For example, TRP 205-a and TRP 205-b may send the same transmission on the same downlink communication link 210 according to the SDM scheme, FDM scheme, TDM scheme, SFN scheme, etc., where the downlink transmission is associated with two TCI states corresponding to the two TRPs 205. In other words, the downlink communication link 210 may be an "SFN" downlink communication link or a part of an "SFN" downlink communication link. TRP 205-a and TRP 205-b may perform joint transmission to UE 115-a according to various types of SFN communication schemes (such as SFN communication scheme 0, SFN communication scheme 1, or SFN communication scheme 2), which is described in further detail with respect to Figure 4 For further details. UE 115-a may process the signals received from one or more TRPs 205 non-jointly (e.g., by not performing layer splitting and not performing joint precoding in the case of SDM). The receiving UE 115-a may use macro-diversity or frequency-diversity gain to assist in receiving signals from multiple spatially dispersed TRPs 205. In some cases, one or more TRPs 205 configured to use SFN may use beamforming to send signals on one or more beams and may alternatively or additionally send signals in terms of area, direction, or both. In some examples, if UE 115 has relatively high mobility (such as a high-speed train), then UE 115 may use the SFN scheme. Additionally, SFN communication may be useful for some service types (such as broadcast or multicast services).

[0105] In some examples, the frameworks of the SDM scheme and the SFN scheme can be unified, such that the UE 115 can support the combined SDM and SFN schemes. For example, the UE 115 can use the SDM scheme or the SFN scheme to transmit signaling based on the DMRS ports and the TCI states. The UE 115 can have multiple DMRS ports, and each DMRS port is configured with one or more TCI states. The UE 115 can use the SFN scheme for communications across multiple TCI states and use the SDM scheme for communications across one or more DMRS ports. For example, the UE 115 can have DMRS port 0 configured with TCI states 1 and 2 and DMRS port 1 configured with TCI states 3 and 4. The UE 115 can apply the SFN scheme to communications across TCI states 1 and 2 (which can be referred to as SFN layer 0), and apply the SFN scheme to communications across TCPI states 3 and 4 (which can be referred to as SFN layer 1). The UE 115 can use the SDM scheme for communications across the DMRS ports (e.g., sending or receiving communications associated with DMRS port 0 or SFN layer 0 and DMRS port 1 or SFN layer 1). In some other examples, the UE 115 can have DMRS port 0 configured with TCI state 1, DMRS port 1 configured with TCI states 1 and 2, and DMRS port 3 configured with TCI state 2. The UE 115 can apply the SFN scheme to communications across TCI states 1 and 2 associated with DMRS port 1. The UE 115 can use the SDM scheme for communications across the DMRS ports (e.g., sending or receiving communications associated with DMRS port 0, DMRS port 1, and DMRS port 3).

[0106] In some examples, there may be one or more common features, common parameters, or both between the communication schemes. For example, the SFN scheme can share one or more parameters with the SDM scheme. For each communication scheme, the UE 115 can determine one or more TRPs 205 participating in the transmission based on the frequency range (e.g., frequency range 2 (FR2), which can include the frequency band from 24.25 GHz to 52.6 GHz) and based on two or more TCI states being mapped to a single code point indicated by the scheduling DCI for the UE 115. In some other examples, each communication scheme can have one or more different features (including the configurability of the UE 115 or other devices, different ranges of parameters (e.g., the number of DMRS ports for each TRP 205, which can be different in the SDM scheme or the same for the SFN scheme)).

[0107] In some examples, a network (e.g., including one or more TRPs 205, base stations 105, one or more UEs 115, or combinations thereof) may support multi-TRP communication, single-TRP communication, or both. For example, as shown in wireless communication system 200, TRP 205-a, TRP 205-b, or both may perform joint transmission of signaling to UE 115-a, may communicate with UE 115-a independently (e.g., may perform non-joint transmission), or both. In some examples of multi-TRP communication, the TRPs 205 may communicate with one or more UEs 115 using different communication schemes (e.g., SDM schemes, SFN schemes, or combined SDM and SFN schemes) to improve spectral efficiency. However, the UE 115 may not know which communication scheme is to be implemented or the relevant configurations and signaling for that communication scheme.

[0108] In some examples, the UE 115 may send a message to the TRP 205 in a multi-TRP network indicating the UE 115's capabilities to support a communication scheme (e.g., SDM scheme, SFN scheme, combined SDM and SFN scheme, etc.), and may receive a configuration for communicating according to the communication scheme from the TRP 205. For example, UE 115-a may send a capabilities message 220 to TRP 205-a via an uplink communication link 215. In some cases, TRP 205-a may send the capabilities message 220 to other TRPs 205 (e.g., to TRP 205-b), base station 105-a, other network nodes, or combinations thereof, using communication link 125-a, communication link 125-d, or other communication link 125, respectively. The capabilities message 220 may indicate the supported communication scheme (e.g., the supported spatial domain multi-TRP mode). In some examples, the capabilities message 220 may include components such as: the maximum number of active TCI states supported by UE 115-a, one or more potential TCI code points that UE 115-a may support for the communication scheme, and the maximum number of simultaneous spatial QCL assumptions or beams that UE 115-a is capable of maintaining (e.g., based on the number of ports used for processing in a frequency range (e.g., FR2)). In some examples, the spatial QCL assumptions or beams may be QCL type D information, which may be based on one or more spatial receiver parameters (e.g., the angle of arrival (AoA) at UE 115-a). The number of QCL type D information may be based on one receive antenna panel or two receive antenna panels for the SDM scheme or the SFN scheme, respectively.

[0109] In some cases, the TRP 205-a may send a parameter configuration 225 to the UE 115-a via the downlink communication link 210. For example, the parameter configuration 225 may include one or more parameters for an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, etc. The one or more parameters may be common to both the SDM scheme and the SFN scheme. In some examples, the TRP 205-a may send a communication scheme indication 230 to the UE 115-a via the downlink communication link 210 based on the capability message 220. The communication scheme indication 230 may indicate an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, etc. for use by the UE 115-a in communication between the UE 115-a and the TRP 205-a. For example, the communication scheme indication 230 may include one or more parameters specific to the communication scheme.

[0110] In some examples, the TRP 205-a may send the communication scheme indication 230 as a field in control signaling (e.g., including parameters for mode indication, where the mode includes operating using an SDM scheme, an SFN scheme 1, an SFN mode 2, or other schemes). In some cases, the TRP 205-a may send the communication scheme indication 230 in higher layer signaling (e.g., in RRC signaling). In some other cases, the TRP 205-a may dynamically send the communication scheme indication 230 in a DCI message. The TRP 205-a may use a new or repurposed DCI field to explicitly indicate the communication scheme, or may implicitly indicate the communication scheme by mapping the communication scheme to a DCI field (e.g., a time domain resource assignment (TDRA) field may indicate a TDRA table entry associated with the communication scheme). For example, the UE 115-a may receive an explicit indication of the communication scheme in a DCI message from the TRP 205-a. The communication scheme indication 230 may include a value of a TDRA table field in the DCI message indicating an entry in the TDRA table that may be associated with the communication scheme. The communication scheme indication 230 may include a value of a TCI field in the DCI message indicating multiple TCI states. In some cases, the UE 115-a may determine that the communication scheme indication 230 indicates an SDM scheme based on the antenna port field in the DCI message indicating multiple code division multiplexing (CDM) groups. In some other cases, the UE 115-a may determine that the communication scheme indication 230 is for an SFN scheme based on the antenna port field in the DCI message indicating a single CDM group.

[0111] In some examples, UE 115-a may communicate with one or more TRPs 205 (such as TRP 205-a) based on the communication scheme indicated in communication scheme indication 230. For example, UE 115-a may receive signaling from TRP 205-a and may adapt the processing of the received signaling based on the indicated communication scheme. In some examples, UE 115-a may adapt a channel estimation scheme, which may be based on the communication scheme identified in parameter configuration 225. For example, if the communication scheme is an SDM scheme, UE 115-a may perform channel estimation on the received signal based on Equation 1:

[0112]

[0113] where H a is the channel matrix, and W a is the precoder matrix of the channel from TRP 205-a, H b is the channel matrix, and W b is the precoder matrix of the channel from TRP 205-b, I is the identity matrix, and N is the noise matrix. In SDM, UE 115-a may estimate the precoded channel matrices H a W a and H b W b to perform data decoding separately using separate sets of DMRS ports.

[0114] In some other examples, if the communication scheme is an SFN scheme, UE 115-a may perform channel estimation on the received signal based on Equation 2:

[0115] Y = (H a W a + H b W b )X + I + N

[0116] where H a is the channel matrix, and W a is the precoder matrix of the channel from TRP 205-a, H b is the channel matrix, and W b is the precoder matrix of the channel from TRP 205-b, I is the identity matrix, and N is the noise matrix. For SFN scheme 1, UE 115-a may use a common set of DMRS ports to estimate the matrix of the effective channel (such as H a W a and H b W b )(e.g., H a W a+H b W b )。The UE 115-a may use the estimated matrix or the effective channel to perform data decoding. For the SFN scheme 2, the UE 115-a may use a separate set of DMRS ports to estimate the precoded channel matrices H a W a and H b W b 。The UE 115-a may use the estimated matrix or the effective channel to perform data decoding.

[0117] Figure 3 FIG. 300 shows an example of a communication scenario diagram that supports techniques for configuring multi-TRP communication scenarios in accordance with aspects of the present disclosure. In some examples, the communication scenario diagram 300 may be implemented to implement aspects of the wireless communication system 100 or the wireless communication system 200. For example, one or more TRPs 205 (e.g., multi-TRP 205) and the UE 115 may employ an SDM scenario as shown by the communication scenario diagram 300 described with reference to Figure 1 and Figure 2 The UE 115 may send capabilities for supporting one or more communication scenarios (e.g., SFN scenario, SDM scenario, or combined SDM and SFN scenario) to one or more TRPs 205. A TRP 205 among the one or more TRPs 205 may send a configuration including one or more parameters common to a set of communication scenarios (e.g., including the SDM scenario) and an indication to use a specific communication (e.g., SDM scenario, SFN scenario, combined SDM and SFN scenario) to the UE 115 based on receiving a capabilities message from the UE 115. The communication scenario diagram 300 may show a joint downlink transmission from a first TRP 205 applying the TCI state 315 and from a second TRP 205 applying the TCI state 320 to the UE 115.

[0118] For example, in a multi-TRP design based on a single DCI, a single PDCCH (e.g., a single NR-PDCCH) can schedule a single PDSCH (e.g., a single NR-PDSCH), and the multi-TRP 205 can apply various communication schemes, such as the SDM scheme shown in communication scheme FIG. 300. In some cases, the multi-TRP 205 can apply the SDM scheme, where different TRPs 205 can send different spatial layers in overlapping resource elements 305 and symbols 310. In such a case, the multi-TRP 205 can send different layers with different TCI states. For example, the first TRP 205 can send the first layer with TCI state 315, and the second TRP 205 can send the second layer with TCI state 320. The first symbol 310 of each layer sent by different TRPs 205 (and also sent according to different TCI states) can include DMRS 325 (e.g., when using the SDM scheme, the first symbol 310 including DMRS 325 can be the same symbol for both the first TRP and the second TRP).

[0119] In addition, for the transmission of DMRS 325 in the example where the first TRP 205 and the second TRP 205 transmit according to the SDM scheme, the resource elements 305 to which the TRP 205 can map the DMRS ports can be configured according to a frequency hopping pattern, such that the DMRS ports associated with the first set of layers sent by the first TRP 205 with TCI state 315 do not occupy the same resource elements 305 as the DMRS ports associated with the second set of layers sent by the second TRP 205 with TCI state 320. For example, the first TRP 205 can send DMRS ports 0, 1 on the first set of resource elements 305 with TCI state 315, and the second TRP 205 can send DMRS ports 2, 3 on the second set of resource elements 305 with TCPI state 320, such that the first set of resource elements 305 and the second set of resource elements 305 do not occupy the same resource elements 305.

[0120] As shown by the SDM scheme in communication scenario diagram 300, the first TRP 205 and the second TRP 205 may transmit over a set of resource elements 305 and symbols 310. In some cases, a resource block may include 12 resource elements 305, such that in some aspects, the first TRP 205 and the second TRP 205 may also be understood to transmit over a resource block (or set of resource blocks) and symbols 310. In the depicted example, there are four layers and four DMRS ports, where each port corresponds to a layer. In one example, each DMRS port may correspond to a layer, such that DMRS ports 0, 1 may be associated with TCI state 315 and correspond to the first two layers, and DMRS ports 2, 3 may be associated with TCI state 320 and correspond to the next two layers. Data layers (different from DMRS ports) may be mapped to the same resource element 305, such that each data resource element 305 includes all four layers (e.g., the first two layers and the next two layers).

[0121] In some examples, the UE 115 may receive configuration from the TRP 205 that indicates a set of parameters common to both the SDM scheme and the SFN scheme. In some examples, the configuration may also include one or more parameters specific to one or more SDM schemes and / or SFN schemes. The UE 115 may receive an indication of a communication scheme that indicates the SDM scheme shown in communication scenario diagram 300 from the TRP 205. The UE 115 may determine a set of parameters for communication with the multi-TRP 205 specific to the SDM communication scheme. The UE 115 may receive signaling from one or more TRP 205s and may process the signaling according to the SDM scheme. For example, the UE 115 may perform channel estimation based on the SDM scheme.

[0122] Figure 4 Examples of communication scenario diagrams 400, 401, and 402 are shown that support techniques for configuring multi-TRP communication schemes in accordance with aspects of the present disclosure. In some examples, communication scenario diagrams 400, 401, and 402 may be implemented to implement aspects of wireless communication system 100 or wireless communication system 200. For example, the TRP 405, the TRP 410, or both (which may be examples of the TRP 205 as described Figure 2 e.g., the multi-TRP 205) and the UE 115 may employ techniques adopted through as described Figure 1 and Figure 2One or more SFN schemes shown in communication schemes diagrams 400, 401, and 402. The UE 115 may send capabilities for supporting one or more communication schemes (e.g., SFN scheme, SDM scheme, or a combined SDM and SFN scheme) to one or more TRPs 205. A TRP 205 among the one or more TRPs 205 may send a configuration including one or more parameters common to a set of communication schemes (e.g., including an SDM scheme). In some cases, the TRP 405, the TRP 410, or both may send an indication to the UE 115 to use the SFN scheme among the SFN schemes based on receiving a capabilities message from the UE 115. In some cases, communication schemes diagrams 400, 401, and 402 may show a joint downlink transmission from the TRP 405 applying the TCI state 415 and from the TRP 410 applying the TCI state 420 to the UE 115.

[0123] Communication scheme diagram 400 shows SFN scheme 0. In some aspects, SFN communication 0 may also refer to a transparent SFN scheme. In some examples, the TRP 405 and the TRP 410 may each send two separate reference signals (e.g., reference signal 1 (RS1) and reference signal 2 (RS2) respectively), and each separate reference signal may be associated with a different PDSCH. Thus, to implement the "SFN" PDSCH, the TRP 405 and the TRP 410 may define an additional TCI state (such as TCI state 425), which may be used to send the "SFN" reference signal associated with the "SFN" PDSCH. The "SFN" PDSCH in SFN communication 0 may include DMRS ports and data layers associated with the additional TCI state 425.

[0124] Communication scheme diagram 401 shows SFN scheme 1. In such an SFN scheme 1, the TRP 405 and the TRP 410 may send two separate reference signals (e.g., RS1 and RS2 respectively), and each of the two reference signals may be associated with a different PDSCH and may also be associated with a joint "SFN" PDSCH, where each DMRS port or data layer of the "SFN" PDSCH is associated with both the TCI state 415 and the TCI state 420. In other words, the TRP 405 and the TRP 410 may send reference signals (such as TRS) in a TRP-specific or non-SFN manner, while the associated DMRS and PDCCH or PDSCH from the TRP are sent in an SFN manner.

[0125] Communication scenario diagram 402 shows SFN scenario 2. In such an SFN scenario 2, TRP 405 and TRP 410 can transmit two separate reference signals (e.g., RS1 and RS2 respectively), and each of these two reference signals can be associated with a different PDSCH and also with a joint PDSCH, where each data layer of the joint PDSCH is associated with TCI state 415 and TCI state 420, and each DMRS port in the joint PDSCH is associated with TCI state 415 or TCI state 420 (e.g., not both). For example, DMRS port 0 of the joint PDSCH can be associated with TCI state 415 (instead of TCI state 420), and DMRS port 1 of the joint PDSCH can be associated with TCI state 420 (instead of TCI state 415). In other words, TRP 405 and TRP 410 can transmit reference signals (such as TRS) and DMRS in a TRP-specific or non-SFN manner, while the associated PDSCH (e.g., data layer) from the TRP is transmitted in an SFN manner.

[0126] In some examples, UE 115 can receive a configuration from TRP 205 that indicates a set of parameters common to both the SDM scenario and the SFN scenario. UE 115 can receive an indication of the communication scenario from TRP 205 that indicates one of SFN scenario 0, SFN scenario 1, or SFN scenario 2 shown in communication scenario diagrams 400 to 402 respectively. UE 115 can determine a set of SFN-scenario-specific parameters for communicating with TRP 405, TRP 410, or both. For example, the indication of the communication scenario can include one or more parameters specific to the SFN scenario. UE 115 can receive signaling from TRP 405, TRP 410, or both and can process the signaling according to the SDM scenario. For example, UE 115 can perform channel estimation based on the SDM scenario.

[0127] Figure 5An example of process flow 500 is shown that supports techniques for configuring multi-TRP communication scenarios in accordance with aspects of the present disclosure. In some examples, process flow 500 may implement aspects of wireless communication system 100, wireless communication system 200, communication scenario diagram 300, communication scenario diagrams 400 through 402, or combinations thereof. Process flow 500 may show an example where TRP 205 (such as TRP 205-b) configures UE 115 (such as UE 115-b) with a set of parameters common to both the SDM scenario and the SFN scenario and indicates to UE 115 to communicate with the multi-TRP using one of the SDM scenario, the SFN scenario, or a combined SDM and SFN scenario. Alternative examples may be implemented where some processes are performed in a different order than described or not performed at all. In some cases, the process may include additional features not mentioned below, or additional processes may be added.

[0128] At 505, UE 115-b may send a message indicating the capabilities of UE 115-b to support the SDM scenario, the SFN scenario (e.g., which may be referred to as a single-frequency communication scenario), or a combined SDM and SFN scenario for communication with the multi-TRP. For example, the message may include a set of capabilities for one or both of the SDM scenario and the SFN scenario, the set of capabilities including the number of spatial QCL assumptions or beams that can be maintained by UE 115-b, the number of TCI states supported by UE 115-b, the number of TCI code points supported by UE 115-b, or any combination thereof.

[0129] At 510, TRP 205-c may determine one or more sets of parameters for the SDM scenario, the SFN scenario, the combined SDM and SFN scenario, or a combination thereof. For example, TRP 205-c may determine a set of parameters common between the SDM scenario and the SFN scenario. Additionally or alternatively, TRP 205-c may determine a set of parameters for each communication scenario (e.g., specific to each communication scenario).

[0130] At 515, the TRP 205-c may send a configuration to the UE 115-b, which includes an indication of at least one of the determined one or more parameter sets. For example, the TRP 205-c may include an indication of a common parameter set, a parameter set for a communication scheme, or both. In some examples, the TRP 205-c may select a parameter set for a communication scheme based on the capability message 505. That is, if the UE 115-b is capable of supporting the SDM scheme, the TRP 205-c may include an indication of the parameter set for the SDM scheme. Similarly, if the UE 115-b is capable of supporting the SFN scheme or a combined SDM and SFN scheme, the TRP 205-c may include an indication of the parameter set for the SFN scheme or the combined SDM and SFN scheme.

[0131] At 520, the UE 115-b may receive an indication of a communication scheme (e.g., SDM scheme, SFN scheme including type, combined SDM and SFN scheme, etc.). In some cases, the UE 115-b may use the communication scheme to communicate with multiple TRPs. In some examples, the UE 115-b may receive a communication scheme indication in the mode indicator field of an RRC message at 520. In some examples, the UE 115-b may receive a communication scheme indication in a DCI message at 520. In some cases, the UE 115-b may receive an explicit indication of a communication scheme in a DCI message. For example, the indication of a communication scheme at 520 may include a value of a TDRA table field for an entry in the TDRA table for which the indication in the DCI message may be associated with the communication scheme. In some other examples, the indication of a communication scheme at 520 may include a value of the TCI field in the DCI message indicating multiple TCI states. In some cases, the UE 115-b may determine that the communication scheme indication at 520 is for the SFN scheme based on the antenna port field in the DCI message indicating multiple CDM groups. In some other cases, the UE 115-b may determine that the communication scheme indication at 520 is for the SDM scheme based on the antenna port field in the DCI message indicating a single CDM group.

[0132] At 525, UE 115-d may determine one or more parameter sets for an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, or a combination thereof. For example, UE 115-b may receive an indication of a common parameter set between an SDM scheme and an SFN scheme in the indication at 515, and additionally or alternatively, UE 115-b may receive an indication of a parameter set specific to the communication scheme indicated at 520 (e.g., specific to an SDM scheme, an SFN scheme, or a combined SDM and SFN scheme). UE 115-b may receive a parameter set specific to the communication scheme in the configuration at 515, the communication scheme at 520, or a combination of both.

[0133] At 530, UE 115-b may determine which of the multiple TRPs 205 to communicate with based on two or more TCI states being mapped to TCI code points for each TRP 205 with which UE 115-b communicates. In some examples, UE 115-b may determine the communication scheme to use based on the association between the parameter set indicated in the configuration at 515 and the communication scheme at 520.

[0134] At 535, UE 115-b may communicate with the multiple TRPs 205 (which may include TRP 205-c) based on the communication scheme indicated at 520. For example, UE 115-b may communicate with the multiple TRPs based on a parameter set that may be common to the communication scheme, a parameter set specific to the communication scheme, or both. In some cases, UE 115-b may receive signaling from the multiple TRPs, a network node, or both based on the communication scheme (e.g., an SDM scheme, an SFN scheme, a combined SDM and SFN scheme, or a combination). In some examples, UE 115-b may determine a configurability value, the number of DMRS ports from each TRP 205, or both based on the communication scheme. UE 115-b may receive signaling from TRP 205-c based on the configurability value or the number of DMRS ports.

[0135] At 540, UE 115-b may perform channel estimation on the signaling received at 535. For example, UE 115-b may perform channel estimation using multiple sets of DMRS ports of the corresponding TRP 205 based on TRP 205-c indicating one of an SDM scheme or a second type of SFN scheme (e.g., SFN mode 2 as described with reference to Figure 4 In some other examples, UE 115-b may perform channel estimation using multiple sets of DMRS ports of the corresponding TRP 205 based on TRP 205-c indicating a first type of SFN scheme (e.g., as described with reference to Figure 4Perform channel estimation using the common DMRS port set of the corresponding TRP 205 in the described SFN mode 1).

[0136] Figure 6 FIG. 600 is a block diagram of a device 605 supporting techniques for configuring multi-TRP communication schemes in accordance with aspects of the present disclosure. The device 605 may be an example of aspects of the UE 115 described herein. The device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may communicate with one another (e.g., via one or more buses).

[0137] The receiver 610 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring multi-TRP communication schemes). The information may be passed to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.

[0138] The transmitter 615 may provide a unit for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring multi-TRP communication schemes). In some examples, the transmitter 615 may be co-located with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.

[0139] The communication manager 620, the receiver 610, the transmitter 615, or various combinations or various components thereof may be examples of units for performing aspects of the techniques for configuring multi-TRP communication schemes described herein. For example, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may support methods for performing one or more of the functions described herein.

[0140] In some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), 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 to or otherwise supporting units for performing the functions described in this disclosure. In some examples, the processor and 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).

[0141] Additionally or alternatively, in some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented with code executed by a processor (e.g., as communication management software or firmware). If implemented with code executed by a processor, the functions of the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be performed by a general purpose processor, a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured to or otherwise supporting units for performing the functions described in this disclosure).

[0142] In some examples, the communication manager 620 may be configured to use the receiver 610, the transmitter 615, or both, or otherwise cooperate with the receiver 610, the transmitter 615, or both to perform various operations (e.g., receive, monitor, transmit). For example, the communication manager 620 may receive information from the receiver 610, send information to the transmitter 615, or integrate with the receiver 610, the transmitter 615, or both to receive information, send information, or perform various other operations as described herein.

[0143] According to examples disclosed herein, the communication manager 620 may support wireless communication at a UE. For example, the communication manager 620 may be configured to or otherwise support a unit for receiving a configuration that indicates parameters for a SDM scheme and an SFN scheme for communication with multiple TRPs supported by the UE, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme. The communication manager 620 may be configured to or otherwise support a unit for receiving an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme. The communication manager 620 may be configured to or otherwise support a unit for communicating with multiple TRPs using the received configuration with parameters corresponding to the indicated communication scheme.

[0144] By including or configuring the communication manager 620 according to examples described herein, a device 605 (e.g., a processor that controls or is otherwise coupled to the receiver 610, the transmitter 615, the communication manager 620, or a combination thereof) may support techniques for more efficiently utilizing communication resources based on an indication from a TRP 205 of a communication scheme and a set of parameters for the UE 115 to use for communication with multiple TRPs 205.

[0145] Figure 7 A block diagram 700 of a device 705 that supports techniques for configuring a multi-TRP communication scheme in accordance with aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or the UE 115 described herein. The device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0146] The receiver 710 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring a multi-TRP communication scheme). The information may be passed to other components of the device 705. The receiver 710 may utilize a single antenna or an array of multiple antennas.

[0147] Transmitter 715 may provide a unit for transmitting signals generated by other components of device 705. For example, transmitter 715 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring multi-TRP communication schemes). In some examples, transmitter 715 may be co-located with receiver 710 in a transceiver module. Transmitter 715 may utilize a single antenna or an array of multiple antennas.

[0148] Device 705 or its various components may be examples of units for performing aspects of the techniques for configuring multi-TRP communication schemes as described herein. For example, communication manager 720 may include capability component 725, parameter component 730, communication scheme component 735, or any combination thereof. Communication manager 720 may be an example of aspects of communication manager 620 as described herein. In some examples, communication manager 720 or its various components may be configured to perform various operations (e.g., receive, monitor, transmit) using receiver 710, transmitter 715, or both, or otherwise cooperate with receiver 710, transmitter 715, or both. For example, communication manager 720 may receive information from receiver 710, send information to transmitter 715, or integrate with receiver 710, transmitter 715, or both to receive information, send information, or perform various other operations as described herein.

[0149] According to examples disclosed herein, communication manager 720 may support wireless communication at a UE. Capability component 725 may be configured to or otherwise support a unit for transmitting a message indicating the UE's capabilities to support SDM and SFN schemes for communication with multiple TRPs. Parameter component 730 may be configured to or otherwise support a unit for receiving a configuration indicating parameters for SDM and SFN schemes, the parameters including a first set of parameters common to both the SDM and SFN schemes. Communication scheme component 735 may be configured to or otherwise support a unit for receiving an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM and an SFN scheme. Communication scheme component 735 may be configured to or otherwise support a unit for communicating with multiple TRPs using the received parameters corresponding to the indicated communication scheme.

[0150] Figure 8FIG. 800 is a block diagram illustrating a communication manager 820 that supports techniques for configuring multi-TRP communication schemes in accordance with aspects of the present disclosure. The communication manager 820 may be an example of the communication manager 620, the communication manager 720, or aspects of both as described herein. The communication manager 820 or its various components may be examples of units for performing aspects of the techniques for configuring multi-TRP communication schemes as described herein. For example, the communication manager 820 may include a capabilities component 825, a parameters component 830, a communication scheme component 835, a channel estimation component 840, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0151] In accordance with examples disclosed herein, the communication manager 820 may support wireless communication at a UE. The capabilities component 825 may be configured to or otherwise support a unit for transmitting a message indicating the UE's capabilities to support a SDM scheme and a SFN scheme for communicating with multiple TRPs. The parameters component 830 may be configured to or otherwise support a unit for receiving a configuration indicating parameters for the SDM scheme and the SFN scheme, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme. The communication scheme component 835 may be configured to or otherwise support a unit for receiving an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, a SFN scheme, or a combination of the SDM scheme and the SFN scheme. In some examples, the communication scheme component 835 may be configured to or otherwise support a unit for communicating with multiple TRPs using the parameters corresponding to the indicated communication scheme with the received configuration.

[0152] In some examples, the parameters component 830 may be configured to or otherwise support a unit for determining a second set of parameters for communicating with multiple TRPs, the second set of parameters being specific to a configuration-based communication scheme. In some examples, the parameters component 830 may be configured to or otherwise support a unit for communicating with multiple TRPs based on the first set of parameters and the second set of parameters.

[0153] In some examples, the parameters component 830 may be configured to or otherwise support a unit for receiving an indication of the second set of parameters in the configuration.

[0154] In some examples, to support messages indicating transmission capabilities, the capabilities component 825 may be configured to or otherwise support a unit for transmitting a set of capabilities for one or both of the SDM scheme and the SFN scheme, the set of capabilities including: the number of spatial QCL assumptions or beams that can be maintained by the UE, the number of TCI states supported by the UE, the number of TCI code points supported by the UE, or any combination thereof.

[0155] In some examples, signaling is received from multiple TRPs, network nodes, or both, according to one or both of a configuration-based SDM scheme and an SFN scheme.

[0156] In some examples, the communication scheme component 835 may be configured to or otherwise support a unit for determining, based on a communication scheme, one or both of a configurability value or the number of DMRS ports from each of multiple TRPs, wherein the signaling is received based on the configurability value or the number of DMRS ports.

[0157] In some examples, the channel estimation component 840 may be configured to or otherwise support a unit for performing channel estimation on signaling using multiple sets of DMRS ports based on a configuration indicating an SDM scheme, each set of DMRS ports in the multiple sets of DMRS ports corresponding to a respective one of the multiple TRPs.

[0158] In some examples, the channel estimation component 840 may be configured to or otherwise support a unit for performing channel estimation using a common set of DMRS ports based on a first type of configuration indicating an SFN scheme, the common set of DMRS ports being common across multiple TRPs.

[0159] In some examples, the channel estimation component 840 may be configured to or otherwise support a unit for performing channel estimation using multiple sets of DMRS ports based on a second type of configuration indicating an SFN scheme, each set of DMRS ports in the multiple sets of DMRS ports corresponding to a respective one of the multiple TRPs.

[0160] In some examples, the communication scheme component 835 may be configured to or otherwise support a unit for identifying multiple TRPs for communication based on two or more TCI states being mapped to TCI code points for the UE.

[0161] In some examples, the communication scheme component 835 may be configured to or otherwise support a unit for determining a communication scheme based on an association between a set of parameters indicated in a configuration and the communication scheme.

[0162] In some examples, to support receiving configurations, the communication scheme component 835 may be configured to or otherwise support a unit for receiving an indication of a communication scheme in a mode indicator field of an RRC message. In some other cases, the communication scheme component 835 may support a unit for receiving an indication of a communication scheme as an explicit indication in a DCI message. The communication scheme indication may include a value of a TDRA table field for an entry of a TDRA table indicating that an indication for a DCI message may be associated with a communication scheme. The communication scheme indication may include a value of a TCI field of a DCI message indicating multiple TCI states. In some cases, the communication scheme component 835 may determine that the communication scheme indication indicates an SDM scheme based on the antenna port field of the DCI message indicating multiple CDM groups. In some other cases, the communication scheme component 835 may determine that the communication scheme indication is for an SFN scheme based on the antenna port field of the DCI message indicating a single CDM group.

[0163] Figure 9 FIG. shows a system 900 including a device 905 that supports techniques for configuring a multi-TRP communication scheme, in accordance with aspects of the present disclosure. The device 905 may be an example of the device 605, the device 705, or the UE 115 described herein or include components of the device 605, the device 705, or the UE 115. The device 905 may communicate wirelessly with one or more base stations 105, UEs 115, or any combination thereof. The device 905 may include components for two-way voice and data communication, including components for sending and receiving communications, such as a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, code 935, and a processor 940. These components may communicate electronically via one or more buses (e.g., bus 945) or otherwise (e.g., operatively, communicatively, functionally, electronically, electrically) coupled.

[0164] The I / O controller 910 may manage input and output signals for the device 905. The I / O controller 910 may also manage peripheral devices not integrated into the device 905. In some cases, the I / O controller 910 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 910 may utilize, such as an operating system or another known operating system. Additionally or alternatively, the I / O controller 910 may represent a modem, keyboard, mouse, touch screen, or similar device or interact with the above devices. In some cases, the I / O controller 910 may be implemented as part of a processor (such as the processor 940). In some cases, the user may interact with the device 905 via the I / O controller 910 or via hardware components controlled by the I / O controller 910.

[0165] In some cases, the device 905 may include a single antenna 925. However, in some other cases, the device 905 may have more than one antenna 925, and more than one antenna 925 may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 915 may communicate bidirectionally via one or more antennas 925, wired or wireless links as described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 915 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 925 for transmission, and demodulating packets received from one or more antennas 925. The transceiver 915 or the transceiver 915 and one or more antennas 925 may be examples of the transmitter 615, transmitter 715, receiver 610, receiver 710, or any combination thereof or components as described herein.

[0166] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable, computer-executable code 935, which includes instructions that cause the device 905 to perform various functions described herein when executed by the processor 940. The code 935 may be stored in a non-transitory computer-readable medium (such as system memory or another type of memory). In some cases, the code 935 may not be directly executable by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, in addition, the memory 930 may also contain a basic input / output system (BIOS), which may control basic hardware or software operations, such as interactions with peripheral components or devices.

[0167] Processor 940 may include intelligent hardware devices (e.g., general-purpose processor, DSP, CPU, microcontroller, ASIC, FPGA, programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 940 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause device 905 to perform various functions (e.g., functions or tasks supporting techniques for configuring multi-TRP communication schemes). For example, device 905 or components of device 905 may include processor 940 and memory 930 coupled to processor 940, and processor 940 and memory 930 are configured to perform the various functions described herein.

[0168] According to examples as disclosed herein, communication manager 920 may support wireless communication at a UE. For example, communication manager 920 may be configured to or otherwise support a unit for receiving a configuration indicating parameters for an SDM scheme and an SFN scheme for communication with multiple TRPs supported by the UE, the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme. Communication manager 920 may be configured to or otherwise support a unit for receiving an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme. Communication manager 920 may be configured to or otherwise support a unit for communicating with multiple TRPs using the received configuration with parameters corresponding to the indicated communication scheme.

[0169] By including or configuring communication manager 920 according to examples as described herein, device 905 may support techniques for improving communication reliability and reducing latency based on the communication scheme and set of parameters indicated by TRP 205 for the UE 115 to use for communication with multi-TRP 205.

[0170] In some examples, communication manager 920 may be configured to perform various operations (e.g., receive, monitor, transmit) using transceiver 915, one or more antennas 925, or any combination thereof, or in cooperation with transceiver 915, one or more antennas 925, or any combination thereof. Although communication manager 920 is shown as a separate component, in some examples, one or more functions described with reference to communication manager 920 may be supported or performed by processor 940, memory 930, code 935, or any combination thereof. For example, code 935 may include instructions executable by processor 940 to cause device 905 to perform aspects of the techniques for configuring a multi-TRP communication scheme as described herein, or processor 940 and memory 930 may be otherwise configured to perform or support such operations.

[0171] Figure 10 Block diagram 1000 illustrates a device 1005 that supports techniques for configuring a multi-TRP communication scheme in accordance with aspects of the present disclosure. Device 1005 may be an example of aspects of base station 105 as described herein. Device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. Device 1005 may also include a processor. Each of these components may communicate with one another (e.g., via one or more buses).

[0172] Receiver 1010 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring a multi-TRP communication scheme). The information may be passed to other components of device 1005. Receiver 1010 may utilize a single antenna or a collection of multiple antennas.

[0173] Transmitter 1015 may provide a unit for transmitting signals generated by other components of device 1005. For example, transmitter 1015 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring a multi-TRP communication scheme). In some examples, transmitter 1015 may be co-located with receiver 1010 in a transceiver module. Transmitter 1015 may utilize a single antenna or a collection of multiple antennas.

[0174] The communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations thereof or various components thereof can be examples of units for performing aspects of the techniques for configuring multi-TRP communication schemes as described herein. For example, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof can support methods for performing one or more of the functions described herein.

[0175] In some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof can be implemented in hardware (e.g., in a communication management circuit). The hardware can 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 to or otherwise supporting units for performing the functions described in this disclosure. In some examples, a processor and memory coupled to the processor can be configured to perform one or more of the functions described herein (e.g., by the processor executing instructions stored in the memory).

[0176] Additionally or alternatively, in some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof can be implemented with code executed by a processor (e.g., as communication management software or firmware). If implemented with code executed by a processor, the functions of the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof can 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 to or otherwise supporting units for performing the functions described in this disclosure).

[0177] In some examples, the communication manager 1020 can be configured to use the receiver 1010, the transmitter 1015, or both, or otherwise cooperate with the receiver 1010, the transmitter 1015, or both to perform various operations (e.g., receive, monitor, transmit). For example, the communication manager 1020 can receive information from the receiver 1010, send information to the transmitter 1015, or integrate with the receiver 1010, the transmitter 1015, or both to receive information, send information, or perform various other operations as described herein.

[0178] According to examples as disclosed herein, the communication manager 1020 may support wireless communication at a TRP. For example, the communication manager 1020 may be configured to or otherwise support a unit for receiving, from a UE, a message indicating the UE's capabilities to support SDM and SFN schemes for communication with multiple TRPs. The communication manager 1020 may be configured to or otherwise support a unit for sending, to a UE, a configuration indicating parameters for SDM and SFN schemes, the parameters including a first set of parameters common to both the SDM and SFN schemes. The communication manager 1020 may be configured to or otherwise support a unit for sending, to a UE, an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme.

[0179] By including or configuring the communication manager 1020 according to examples as described herein, a device 1005 (e.g., a processor controlling or otherwise coupled to a receiver 1010, a transmitter 1015, the communication manager 1020, or a combination thereof) may support techniques for more efficiently utilizing communication resources based on a communication scheme and a set of parameters indicated by a TRP 205 for a UE 115 to use for communication with multiple TRPs 205.

[0180] Figure 11 Block diagram 1100 of a device 1105 supporting techniques for configuring a multi-TRP communication scheme in accordance with aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or the base station 105 as described herein. The device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. The device 1105 may also include a processor. Each of these components may communicate with one another (e.g., via one or more buses).

[0181] The receiver 1110 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring a multi-TRP communication scheme). The information may be passed to other components of the device 1105. The receiver 1110 may utilize a single antenna or a collection of multiple antennas.

[0182] Transmitter 1115 may provide a unit for transmitting signals generated by other components of device 1105. For example, transmitter 1115 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for configuring a multi-TRP communication scheme). In some examples, transmitter 1115 may be co-located with receiver 1110 in a transceiver module. Transmitter 1115 may utilize a single antenna or an array of multiple antennas.

[0183] Device 1105 or its various components may be examples of units for performing aspects of the techniques for configuring a multi-TRP communication scheme as described herein. For example, communication manager 1120 may include capability component 1125, parameter component 1130, communication scheme component 1135, or any combination thereof. Communication manager 1120 may be an example of aspects of communication manager 1020 as described herein. In some examples, communication manager 1120 or its various components may be configured to perform various operations (e.g., receive, monitor, transmit) using receiver 1110, transmitter 1115, or both, or otherwise in cooperation with receiver 1110, transmitter 1115, or both. For example, communication manager 1120 may receive information from receiver 1110, send information to transmitter 1115, or integrate in combination with receiver 1110, transmitter 1115, or both to receive information, send information, or perform various other operations as described herein.

[0184] According to examples disclosed herein, communication manager 1120 may support wireless communication at a TRP. Capability component 1125 may be configured to or otherwise support a unit for receiving from a UE a message indicating the UE's capabilities to support SDM and SFN schemes for communication with multiple TRPs. Parameter component 1130 may be configured to or otherwise support a unit for sending to a UE a configuration indicating parameters for SDM and SFN schemes, the parameters including a first set of parameters common to both the SDM and SFN schemes. Communication scheme component 1135 may be configured to or otherwise support a unit for sending to a UE an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM and an SFN scheme.

[0185] Figure 12FIG. 1200 is a block diagram showing a communication manager 1220 that supports techniques for configuring multi-TRP communication scenarios in accordance with aspects of the present disclosure. The communication manager 1220 may be an example of aspects of the communication manager 1020, the communication manager 1120, or both as described herein. The communication manager 1220 or its various components may be examples of units for performing various aspects of the techniques for configuring multi-TRP communication scenarios as described herein. For example, the communication manager 1220 may include a capabilities component 1225, a parameters component 1230, a communication scenario component 1235, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0186] According to examples as disclosed herein, the communication manager 1220 may support wireless communication at a TRP. The capabilities component 1225 may be configured to or otherwise support a unit for receiving a message from a UE indicating the UE's capabilities to support SDM and SFN schemes for communication with multiple TRPs. The parameters component 1230 may be configured to or otherwise support a unit for sending to the UE an indication of a configuration of parameters for SDM and SFN schemes, the parameters including a first set of parameters common to both the SDM and SFN schemes. The communication scenario component 1235 may be configured to or otherwise support a unit for sending to the UE an indication of a communication scenario for the UE to use for communication with multiple TRPs, the communication scenario including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme.

[0187] In some examples, the parameters component 1230 may be configured to or otherwise support a unit for determining a first set of parameters for communication between the UE and multiple TRPs based on capabilities. In some examples, the parameters component 1230 may be configured to or otherwise support a unit for determining a second set of parameters for communication between the UE and multiple TRPs based on capabilities, the second set of parameters being specific to a communication scenario.

[0188] In some examples, to support receiving a message indicating capabilities, the capabilities component 1225 may be configured to or otherwise support a unit for receiving a set of capabilities for one or both of an SDM and an SFN scheme, the set of capabilities including: the number of spatial QCL assumptions or beams that can be maintained by the UE, the number of TCI states supported by the UE, the number of TCI code points supported by the UE, or any combination thereof.

[0189] In some examples, the parameter component 1230 may be configured to or otherwise support a unit for determining at least one parameter of a communication scheme based on: the number of spatial QCL assumptions or beams that can be maintained by the UE, the number of TCI states supported by the UE, the number of TCI code points supported by the UE, or any combination thereof.

[0190] In some examples, the communication scheme component 1235 may be configured to or otherwise support a unit for sending signaling to the UE according to a configured communication scheme.

[0191] In some examples, the communication scheme component 1235 may be configured to or otherwise support a unit for determining, based on the communication scheme, one or both of a configurability value or the number of DMRS ports for each of multiple TRPs, wherein the signaling is sent based on the configurability value or the number of DMRS ports.

[0192] In some examples, to support sending an indication of the communication scheme, the communication scheme component 1235 may be configured to or otherwise support a unit for sending an indication of the communication scheme in the mode indicator field of an RRC message. In some other cases, the communication scheme component 1235 may support a unit for sending an indication of the communication scheme as an explicit indication in a DCI message. The communication scheme indication may include a value of a TDRA table field indicating an entry of a TDRA table for which the indication of the DCI message may be associated with the communication scheme. The communication scheme indication may include a value of a TCI field of the DCI message indicating multiple TCI states. In some cases, the communication scheme component 1235 may determine that the communication scheme indication indicates an SDM scheme based on the antenna port field of the DCI message indicating multiple CDM groups. In some other cases, the communication scheme component 1235 may determine that the communication scheme indication is for an SFN scheme based on the antenna port field of the DCI message indicating a single CDM group.

[0193] Figure 13FIG. shows a system 1300 including a device 1305 that supports techniques for configuring multi-TRP communication scenarios, in accordance with aspects of the present disclosure. The device 1305 may be an example of, or include components of, the device 1005, the device 1105, or the base station 105 as described herein. The device 1305 may communicate wirelessly with one or more base stations 105, UEs 115, or any combination thereof. The device 1305 may include components for two-way voice and data communication, including components for sending and receiving communications, such as a communication manager 1320, a network communication manager 1310, a transceiver 1315, an antenna 1325, a memory 1330, code 1335, a processor 1340, and an inter-station communication manager 1345. These components may communicate electronically via one or more buses (e.g., bus 1350) or otherwise be coupled (e.g., operatively, communicatively, functionally, electronically, electrically).

[0194] The network communication manager 1310 may manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1310 may manage the transmission of data communications for client devices (e.g., one or more UEs 115).

[0195] In some cases, the device 1305 may include a single antenna 1325. However, in some other cases, the device 1305 may have more than one antenna 1325, and the more than one antenna 1325 may be capable of simultaneously sending or receiving multiple wireless transmissions. The transceiver 1315 may communicate bidirectionally via one or more antennas 1325, wired or wireless links as described herein. For example, the transceiver 1315 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1315 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 1325 for transmission, and demodulating packets received from one or more antennas 1325. The transceiver 1315, or the transceiver 1315 and one or more antennas 1325, may be an example of, or include components of, the transmitter 1015, the transmitter 1115, the receiver 1010, the receiver 1110, or any combination thereof as described herein.

[0196] Memory 1330 may include RAM and ROM. Memory 1330 may store computer-readable, computer-executable code 1335 that includes instructions that, when executed by processor 1340, cause device 1305 to perform the various functions described herein. Code 1335 may be stored in a non-transitory computer-readable medium (such as system memory or another type of memory). In some cases, code 1335 may not be directly executable by processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, in addition, memory 1330 may also contain BIOS, which may control basic hardware or software operations, such as interactions with peripheral components or devices.

[0197] Processor 1340 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1340 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks that support techniques for configuring multi-TRP communication schemes). For example, device 1305 or components of device 1305 may include processor 1340 and memory 1330 coupled to processor 1340, and processor 1340 and memory 1330 are configured to perform the various functions described herein.

[0198] The inter-station communication manager 1345 may manage communication with other base stations 105 and may include a controller or scheduler for collaboratively controlling communication with the UE 115 with other base stations 105. For example, the inter-station communication manager 1345 may coordinate the scheduling of transmissions to the UE 115 to implement various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communication manager 1345 may provide an X2 interface within the LTE / LTE-A wireless communication network technology to provide communication between the base stations 105.

[0199] According to an example as disclosed herein, the communication manager 1320 may support wireless communication at the TRP. For example, the communication manager 1320 may be configured to or otherwise support a unit for receiving, from a UE, a message indicating the UE's capabilities to support SDM and SFN schemes for communicating with multiple TRPs. The communication manager 1320 may be configured to or otherwise support a unit for sending, to the UE, a configuration indicating parameters for the SDM and SFN schemes, the parameters including a first set of parameters common to both the SDM and SFN schemes. The communication manager 1320 may be configured to or otherwise support a unit for sending, to the UE, an indication of a communication scheme for the UE to use for communicating with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of the SDM and SFN schemes.

[0200] By including or configuring the communication manager 1320 according to an example as described herein, the device 1305 may support techniques for improving communication reliability and reducing latency based on the communication scheme and set of parameters indicated by the TRP 205 for the UE 115 to use for communicating with multiple TRPs 205.

[0201] In some examples, the communication manager 1320 may be configured to perform various operations (e.g., receive, monitor, transmit) using the transceiver 1315, one or more antennas 1325, or any combination thereof, or in cooperation with the transceiver 1315, one or more antennas 1325, or any combination thereof. Although the communication manager 1320 is shown as a separate component, in some examples, one or more functions described with reference to the communication manager 1320 may be supported or performed by the processor 1340, the memory 1330, the code 1335, or any combination thereof. For example, the code 1335 may include instructions executable by the processor 1340 to cause the device 1305 to perform aspects of the techniques for configuring multi-TRP communication schemes as described herein, or the processor 1340 and the memory 1330 may otherwise be configured to perform or support such operations.

[0202] Figure 14 A flowchart of a method 1400 is shown that illustrates techniques for supporting the configuration of multi-TRP communication schemes in accordance with aspects of the present disclosure. The operations of method 1400 may be implemented by a UE or components thereof as described herein. For example, the operations of method 1400 may be performed by the UE 115 as described with reference to Figures 1 to 9 In some examples, the UE may execute an instruction set to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described functions.

[0203] At 1405, the method can include: receiving a configuration indicating parameters for a spatial division multiplexing (SDM) scheme and a single frequency network (SFN) scheme for communication with multiple transmission and reception points (TRPs) supported by a user equipment (UE), the parameters including a first set of parameters common to both the SDM scheme and the SFN scheme. The operations of 1405 can be performed according to the examples disclosed herein. In some examples, aspects of the operations of 1405 can be performed by a parameter component 830 as described with reference to Figure 8 described.

[0204] At 1410, the method can include: receiving an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme. The operations of 1410 can be performed according to the examples disclosed herein. In some examples, aspects of the operations of 1410 can be performed by a communication scheme component 835 as described with reference to Figure 8 described.

[0205] At 1415, the method can include: communicating with multiple TRPs using the parameters of the received configuration corresponding to the indicated communication scheme. The operations of 1415 can be performed according to the examples disclosed herein. In some examples, aspects of the operations of 1415 can be performed by a communication scheme component 835 as described with reference to Figure 8 described.

[0206] Figure 15 FIG. shows a flow chart of a method 1500 illustrating techniques for supporting configuration of a multi-TRP communication scheme in accordance with aspects of the present disclosure. The operations of method 1500 can be implemented by a UE or components thereof as described herein. For example, the operations of method 1500 can be performed by a UE 115 as described with reference to Figures 1 to 9 described. In some examples, the UE can execute an instruction set to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the described functions.

[0207] At 1505, the method can include: sending a message indicating the UE's capabilities to support an SDM scheme and an SFN scheme for communication with multiple TRPs. The operations of 1505 can be performed according to the examples disclosed herein. In some examples, aspects of the operations of 1505 can be performed by a capabilities component 825 as described with reference to Figure 8 described.

[0208] At 1510, the method may include: receiving a configuration indicating parameters for SDM and SFN schemes, the parameters including a first set of parameters common to both the SDM and SFN schemes. The operations of 1510 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1510 may be performed by a parameter component 830 as described with reference to Figure 8 described.

[0209] At 1515, the method may include: receiving an indication of a communication scheme for use by a UE for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of an SDM scheme and an SFN scheme. The operations of 1515 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1515 may be performed by a communication scheme component 835 as described with reference to Figure 8 described.

[0210] At 1520, the method may include: determining a second set of parameters for communication with multiple TRPs, the second set of parameters being specific to a configuration-based communication scheme. The operations of 1520 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1520 may be performed by a parameter component 830 as described with reference to Figure 8 described.

[0211] At 1525, the method may include: communicating with multiple TRPs using the parameters of the received configuration corresponding to the indicated communication scheme. The operations of 1525 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1525 may be performed by a communication scheme component 835 as described with reference to Figure 8 described.

[0212] At 1530, the method may include: communicating with multiple TRPs based on the first set of parameters and the second set of parameters. The operations of 1530 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1530 may be performed by a parameter component 830 as described with reference to Figure 8 described.

[0213] Figure 16 FIG. shows a flowchart of a method 1600 illustrating techniques for supporting the configuration of a multi-TRP communication scheme in accordance with aspects of the present disclosure. The operations of method 1600 may be implemented by a base station or its components as described herein. For example, the operations of method 1600 may be performed by a component as described with reference to Figures 1 to 5 and Figures 10 to 13be performed by the described base station 105. In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the described functions.

[0214] At 1605, the method may include: sending to the UE a configuration indicating parameters for a spatial division multiplexing (SDM) scheme and a single-frequency network (SFN) scheme supported by the UE for communication with multiple transmit-receive points (TRPs), the parameters including a first set of parameters common to the SDM scheme and the SFN scheme. The operation of 1605 may be performed in accordance with examples disclosed herein. In some examples, aspects of the operation of 1605 may be performed by the parameter component 1230 as described with reference to Figure 12 the description.

[0215] At 1610, the method may include: sending to the UE an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of the SDM scheme and the SFN scheme. The operation of 1610 may be performed in accordance with examples disclosed herein. In some examples, aspects of the operation of 1610 may be performed by the communication scheme component 1235 as described with reference to 12.

[0216] Figure 17 FIG. shows a flowchart of a method 1700 illustrating techniques for supporting the configuration of a multi-TRP communication scheme in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by a base station or its components as described herein. For example, the operations of method 1700 may be performed by the base station 105 as described with reference to Figures 1 to 5 and Figures 10 to 13 the description.

[0217] At 1705, the method may include: receiving from the UE a message indicating the UE's capabilities to support an SDM scheme and an SFN scheme for communication with multiple TRPs. The operation of 1705 may be performed in accordance with examples disclosed herein. In some examples, aspects of the operation of 1705 may be performed by the capabilities component 1225 as described with reference to Figure 12 the description.

[0218] At 1710, the method may include: determining, based on the capabilities, a first set of parameters for communication between the UE and multiple TRPs. The operation of 1710 may be performed in accordance with examples disclosed herein. In some examples, aspects of the operation of 1710 may be performed by the parameter component 1230 as described with reference to Figure 12 the description.

[0219] At 1715, the method may include: determining, based on capabilities, a second set of parameters for communication between a UE and multiple TRPs, the second set of parameters being specific to a communication scheme. The operations of 1715 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1715 may be performed by a parameter component 1230 as described with reference to Figure 12 the parameter component 1230 described.

[0220] At 1720, the method may include: sending to the UE a configuration indicating parameters for a spatial division multiplexing (SDM) scheme and a single frequency network (SFN) scheme, the parameters including a first set of parameters common to the SDM scheme and the SFN scheme. The operations of 1720 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1720 may be performed by a parameter component 1230 as described with reference to Figure 12 the parameter component 1230 described.

[0221] At 1725, the method may include: sending to the UE an indication of a communication scheme for the UE to use for communication with multiple TRPs, the communication scheme including an SDM scheme, an SFN scheme, or a combination of the SDM scheme and the SFN scheme. The operations of 1725 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1725 may be performed by a communication scheme component 1235 as described with reference to 12.

[0222] Aspects of the present disclosure are summarized below:

[0223] Aspect 1: A method for wireless communication at a UE, comprising: receiving a configuration indicating parameters for a spatial division multiplexing scheme and a single frequency communication scheme for communication with multiple transmit receive points supported by the UE, the parameters including a first set of parameters common to both the spatial division multiplexing scheme and the single frequency communication scheme; receiving an indication of a communication scheme for the UE to use for communication with the multiple transmit receive points, the communication scheme including the spatial division multiplexing scheme, the single frequency communication scheme, or a combination of the spatial division multiplexing scheme and the single frequency communication scheme; and communicating with the multiple transmit receive points using the received parameters corresponding to the indicated communication scheme.

[0224] Aspect 2: The method according to aspect 1, further comprising: sending a message indicating the capabilities of the UE to support the spatial division multiplexing scheme and the single frequency communication scheme for communication with multiple transmit receive points supported by the UE.

[0225] Aspect 3: The method according to aspect 1 further includes: determining a second parameter set for communicating with the plurality of transmit-receive points, the second parameter set being specific to the communication scheme that is at least partially based on the configuration; and communicating with the plurality of transmit-receive points at least partially based on the first parameter set and the second parameter set.

[0226] Aspect 4: The method according to aspect 3 further includes: receiving an indication of the second parameter set in the configuration.

[0227] Aspect 5: The method according to any one of aspects 1 to 4, wherein sending the message indicating the capability includes: sending a set of capabilities for one or both of the spatial multiplexing scheme and the single-frequency communication scheme, the set of capabilities including: the number of spatial quasi-co-location assumptions or beams that can be maintained by the UE, the number of transmission configuration indicator states supported by the UE, the number of transmission configuration indicator code points supported by the UE, or any combination thereof.

[0228] Aspect 6: The method according to any one of aspects 1 to 5, wherein communicating includes: receiving signaling from the plurality of transmit-receive points, a network node, or both, according to one or both of the spatial multiplexing scheme and the single-frequency communication scheme that are at least partially based on the configuration.

[0229] Aspect 7: The method according to aspect 6 further includes: determining one or both of a configurability value or the number of demodulation reference signal ports from each of the plurality of transmit-receive points at least partially based on the communication scheme, wherein the signaling is received at least partially based on the configurability value or the number of demodulation reference signal ports.

[0230] Aspect 8: The method according to any one of aspects 6 to 7 further includes: performing channel estimation on the signaling using a plurality of sets of demodulation reference signal ports, each set of demodulation reference signal ports corresponding to a respective one of the plurality of transmit-receive points, at least partially based on the configuration indicating the spatial multiplexing scheme.

[0231] Aspect 9: The method according to any one of aspects 6 to 7 further includes: performing channel estimation using a common set of demodulation reference signal ports that is common across the plurality of transmit-receive points, at least partially based on the configuration indicating a first type of the single-frequency communication scheme.

[0232] Aspect 10: The method according to any one of aspects 6 to 7 further includes: performing channel estimation using a plurality of demodulation reference signal port sets at least partially based on the configuration indicating a second type of the single-frequency communication scheme, where each demodulation reference signal port set in the plurality of demodulation reference signal port sets corresponds to a respective transmit-receive point among the plurality of transmit-receive points.

[0233] Aspect 11: The method according to any one of aspects 6 to 10 further includes: identifying the plurality of transmit-receive points for communication at least partially based on two or more transport configuration indicator states being mapped to transport configuration indicator code points for the UE.

[0234] Aspect 12: The method according to any one of aspects 1 to 11 further includes: determining the communication scheme at least partially based on an association between a set of parameters indicated in the configuration and the communication scheme.

[0235] Aspect 13: The method according to any one of aspects 1 to 12, wherein receiving the indication of the communication scheme includes: receiving the indication of the communication scheme in a mode indicator field of a radio resource control message.

[0236] Aspect 14: The method according to any one of aspects 1 to 13, wherein receiving the indication of the communication scheme includes: receiving a downlink control information message including the indication of the communication scheme.

[0237] Aspect 15: The method according to aspect 14, wherein the indication of the communication scheme includes an explicit indication in the downlink control information message.

[0238] Aspect 16: The method according to any one of aspects 14 to 15, wherein the indication of the communication scheme includes a value of a time domain resource allocation table field indicating an entry of a time domain resource allocation table associated with the communication scheme for the downlink control information message.

[0239] Aspect 17: The method according to any one of aspects 14 to 15, wherein the indication of the communication scheme includes a value of a transport configuration indicator field of the downlink control information message indicating a plurality of transport configuration indicator states.

[0240] Aspect 18: The method according to aspect 17 further includes: determining that the communication scheme includes the spatial division multiplexing scheme at least partially based on an antenna port field of the downlink control information message indicating a plurality of code division multiplexing groups.

[0241] Aspect 19: The method according to aspect 17 further includes: determining that the communication scheme includes the single-frequency communication scheme based at least in part on the antenna port field of the downlink control information message indicating a single code division multiplexing group.

[0242] Aspect 20: A method for wireless communication at a transmit-receive point, including: sending to a UE a configuration indicating parameters for a spatial division multiplexing scheme and a single-frequency communication scheme for communication with a plurality of transmit-receive points supported by the UE, the parameters including a first set of parameters common to both the spatial division multiplexing scheme and the single-frequency communication scheme; and sending to the UE an indication of a communication scheme for the UE to use for communication with the plurality of transmit-receive points, the communication scheme including the spatial division multiplexing scheme, the single-frequency communication scheme, or a combination of the spatial division multiplexing scheme and the single-frequency communication scheme.

[0243] Aspect 21: The method according to aspect 20 further includes: receiving from the UE a message indicating the UE's capabilities to support the spatial division multiplexing scheme and the single-frequency communication scheme for communication with a plurality of transmit-receive points.

[0244] Aspect 22: The method according to aspect 20 further includes: determining at least in part based on the capabilities a first set of parameters for communication between the UE and the plurality of transmit-receive points; and determining at least in part based on the capabilities a second set of parameters for communication between the UE and the plurality of TRPs, the second set of parameters being specific to the communication scheme.

[0245] Aspect 23: The method according to any one of aspects 20 to 22, wherein receiving the message indicating the capabilities includes: receiving a set of capabilities for one or both of the spatial division multiplexing scheme and the single-frequency communication scheme, the set of capabilities including: the number of spatial quasi-co-location assumptions or beams that can be maintained by the UE, the number of transmission configuration indicator states supported by the UE, the number of transmission configuration indicator code points supported by the UE, or any combination thereof.

[0246] Aspect 24: The method according to aspect 23 further includes: determining at least one parameter of the parameters for the communication scheme based at least in part on: the number of spatial quasi-co-location assumptions or beams that can be maintained by the UE, the number of transmission configuration indicator states supported by the UE, the number of transmission configuration indicator code points supported by the UE, or any combination thereof.

[0247] Aspect 25: The method according to any one of aspects 20 to 24 further includes: sending signaling to the UE according to the communication scheme based at least in part on the configuration.

[0248] Aspect 26: The method according to aspect 25 further comprises: determining one or both of a configurability value or the number of demodulation reference signal ports for each of the plurality of transmit - receive points, at least in part based on the communication scheme, wherein the signaling is transmitted at least in part based on the configurability value or the number of demodulation reference signal ports.

[0249] Aspect 27: The method according to any one of aspects 20 to 26, wherein transmitting the indication of the communication scheme comprises: transmitting the indication of the communication scheme in a mode indicator field of a radio resource control message.

[0250] Aspect 28: The method according to any one of aspects 20 to 27, wherein transmitting the indication of the communication scheme comprises: receiving a downlink control information message comprising an indication of the communication scheme.

[0251] Aspect 29: The method according to aspect 28, wherein the indication of the communication scheme comprises an explicit indication in the downlink control information message.

[0252] Aspect 30: The method according to any one of aspects 28 to 29, wherein the indication of the communication scheme comprises a value of a time - domain resource allocation table field indicating an entry of a time - domain resource allocation table associated with the communication scheme for the downlink control information message.

[0253] Aspect 31: The method according to any one of aspects 28 to 29, wherein the indication of the communication scheme comprises a value of a transport format indicator field of the downlink control information message indicating a plurality of transport configuration indicator states.

[0254] Aspect 32: The method according to aspect 31, wherein the downlink control information message further comprises an antenna port field, the antenna port field indicating a plurality of code - division multiplexing groups to indicate that the communication scheme comprises a spatial multiplexing scheme.

[0255] Aspect 33: The method according to aspect 31, wherein the downlink control information message further comprises an antenna port field, the antenna port field indicating a single code - division multiplexing group to indicate that the communication scheme comprises a spatial multiplexing scheme.

[0256] Aspect 34: An apparatus for wireless communication at a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of aspects 1 to 19.

[0257] Aspect 35: An apparatus for wireless communication at a UE, comprising at least one unit for performing the method of any one of Aspects 1 to 19.

[0258] Aspect 36: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method of any one of Aspects 1 to 19.

[0259] Aspect 37: An apparatus for wireless communication at a transmit-receive point, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Aspects 20 to 33.

[0260] Aspect 38: An apparatus for wireless communication at a transmit-receive point, comprising at least one unit for performing the method of any one of Aspects 20 to 33.

[0261] Aspect 39: A non-transitory computer-readable medium storing code for wireless communication at a transmit-receive point, the code comprising instructions executable by a processor to perform the method of any one of Aspects 20 to 33.

[0262] It should be noted that the methods described herein describe possible implementations, and the operations and steps may be rearranged or otherwise modified, and other implementations are possible. In addition, aspects from two or more of the methods may be combined.

[0263] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of illustration, and the LTE, LTE-A, LTE-A Pro, or NR terminology may be used in most of the description, the techniques described herein apply beyond the scope of LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may apply 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.

[0264] The information and signals described herein may be represented using any of a variety of different technologies and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and chipsets that may be referred to throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0265] Various illustrative blocks and components described in connection with the present disclosure can 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 in the alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0266] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted through a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these items. The features implementing the functions can also be physically located at various positions, including being distributed such that portions of the functions are implemented at different physical locations.

[0267] A computer-readable medium includes both a non-transitory computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another. The non-transitory storage medium can be any available medium that can be accessed by a general-purpose or a special-purpose computer. By way of example and not limitation, the non-transitory computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store the desired program code units in the form of instructions or data structures and that can be accessed by a general-purpose or a special-purpose computer, or a general-purpose or a special-purpose processor. Additionally, any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically, while discs use lasers to optically reproduce data. Combinations of the above are also included within the scope of computer-readable medium.

[0268] As used herein (including in the claims), the "or" as used in a list of items (e.g., a list of items that ends with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such that a list of, for example, 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). Additionally, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0269] In the figures, similar components or features may have the same reference numeral. Additionally, various components of the same type can be distinguished by following the reference numeral with a dash and a second numeral, which is used to distinguish among similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, regardless of the second reference numeral or any other subsequent reference numerals.

[0270] This description of example configurations has been presented in conjunction with the accompanying drawings, and does not represent all examples that may be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and not "preferred" or "advantageous over other examples." For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, the technology may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0271] This description is provided to enable a person having ordinary skill in the art to make or use the present disclosure. Various modifications to this disclosure will be readily 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 present disclosure is not limited to the examples and designs described herein, but is accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: Receiving a configuration indicating parameters for a spatial division multiplexing scheme and a single frequency communication scheme for communication with a plurality of transmit-receive points supported by the UE, the parameters including a first set of parameters common to both the spatial division multiplexing scheme and the single frequency communication scheme; Receiving an indication of a communication scheme for the UE to use for communication with the plurality of transmit-receive points, the communication scheme including the spatial division multiplexing scheme, the single frequency communication scheme, or a combination of the spatial division multiplexing scheme and the single frequency communication scheme; And Communicating with the plurality of transmit-receive points according to the indicated communication scheme using at least the first set of parameters common to both the spatial division multiplexing scheme and the single frequency communication scheme.

2. The method according to claim 1, further comprising: Transmitting a message indicating the UE's capabilities to support the spatial division multiplexing scheme and the single frequency communication scheme for communication with the plurality of transmit-receive points.

3. The method according to claim 2, wherein Transmitting the message indicating the capabilities includes: Transmitting a set of capabilities for one or both of the spatial division multiplexing scheme and the single frequency communication scheme, the set of capabilities including: the number of spatial quasi co-location assumptions or beams that can be maintained by the UE, the number of transmission configuration indicator states supported by the UE, the number of transmission configuration indicator code points supported by the UE, or any combination thereof.

4. The method according to claim 1, further comprising: Determining a second set of parameters for communication with the plurality of transmit-receive points, the second set of parameters being specific to the indicated communication scheme; And Communicating with the plurality of transmit-receive points at least in part based on the first set of parameters and the second set of parameters.

5. The method according to claim 4, further comprising: Receiving an indication of the second set of parameters in the configuration.

6. The method according to claim 1, wherein, Communication includes: Receiving signaling from the plurality of transmit-receive points, a network node, or both according to one or both of the spatial division multiplexing scheme and the single frequency communication scheme at least in part based on the indicated communication scheme.

7. The method according to claim 6, further comprising: Determining one or both of a configurability value or the number of demodulation reference signal ports from each of the plurality of transmit-receive points at least in part based on the indicated communication scheme, wherein the signaling is received at least in part based on the configurability value or the number of demodulation reference signal ports.

8. The method according to claim 6, further comprising: Performing channel estimation on the signaling using a plurality of sets of demodulation reference signal ports at least in part based on the indicated communication scheme being the spatial division multiplexing scheme, each set of demodulation reference signal ports in the plurality of sets of demodulation reference signal ports corresponding to a respective one of the plurality of transmit-receive points.

9. The method according to claim 6, further comprising: Perform channel estimation using a common demodulation reference signal port set that is at least partially based on the indicated communication scheme being a first type of the single-frequency communication scheme, the common demodulation reference signal port set being common across the plurality of transmit-receive points.

10. The method according to claim 6, further comprising: Perform channel estimation using a plurality of demodulation reference signal port sets that is at least partially based on the indicated communication scheme being a second type of the single-frequency communication scheme, each demodulation reference signal port set of the plurality of demodulation reference signal port sets corresponding to a respective one of the plurality of transmit-receive points.

11. The method according to claim 6, further comprising: Identify the plurality of transmit-receive points for communication that is at least partially based on two or more transport configuration indicator states being mapped to a transport configuration indicator code point for the UE.

12. The method according to claim 1, further comprising: Determine the indicated communication scheme that is at least partially based on an association between a set of parameters indicated in the configuration and the indicated communication scheme.

13. The method according to claim 1, wherein, Receiving the indication of the communication scheme includes: Receiving the indication of the communication scheme in a mode indicator field of a radio resource control message.

14. The method according to claim 1, wherein, Receiving the indication of the communication scheme includes: Receiving a downlink control information message that includes the indication of the communication scheme.

15. The method according to claim 14, wherein, The indication of the communication scheme includes one or more of the following: an explicit indication in the downlink control information message; a value of a time domain resource allocation table field that indicates an entry of a time domain resource allocation table associated with the indication of the downlink control information message and the indicated communication scheme; and a value of a transport configuration indicator field of the downlink control information message that indicates a plurality of transport configuration indicator states.

16. The method according to claim 14, further comprising: Determine that the indicated communication scheme includes the spatial division multiplexing scheme that is at least partially based on the antenna port field of the downlink control information message indicating a plurality of code division multiplexing groups.

17. The method according to claim 14, further comprising: Determine that the indicated communication scheme includes the single-frequency communication scheme that is at least partially based on the antenna port field of the downlink control information message indicating a single code division multiplexing group.

18. A method for wireless communication at a transmit-receive point, comprising: Transmit a configuration to a user equipment (UE) indicating parameters for a spatial division multiplexing scheme and a single-frequency communication scheme for communication with a plurality of transmit-receive points supported by the UE, the parameters including a first set of parameters common to both the spatial division multiplexing scheme and the single-frequency communication scheme; Transmit an indication of a communication scheme for the UE to use for communication with the plurality of transmit-receive points, the communication scheme including the spatial division multiplexing scheme, the single-frequency communication scheme, or a combination of the spatial division multiplexing scheme and the single-frequency communication scheme; and Send signaling to the UE according to the indicated communication scheme, at least partially based on the first set of parameters common to both the spatial division multiplexing scheme and the single-frequency communication scheme.

19. The method according to claim 18, further comprising: Receiving, from the UE, a message indicating the UE's capabilities to support the spatial division multiplexing scheme and the single-frequency communication scheme for communicating with the plurality of transmit-receive points.

20. The method according to claim 19, further comprising: Determining, at least partially based on the capabilities, the first set of parameters for communication between the UE and the plurality of transmit-receive points; And Determining, at least partially based on the capabilities, a second set of parameters for communication between the UE and the plurality of transmit-receive points, the second set of parameters being specific to the indicated communication scheme.

21. The method according to claim 20, wherein, Receiving the message indicating the capabilities includes: Receiving a set of capabilities for one or both of the spatial division multiplexing scheme and the single-frequency communication scheme, the set of capabilities including: the number of spatial quasi-co-location assumptions or beams that can be maintained by the UE, the number of transmission configuration indicator states supported by the UE, the number of transmission configuration indicator code points supported by the UE, or any combination thereof.

22. The method according to claim 21, further comprising: Determining, at least partially based on the following, at least one of the parameters for the indicated communication scheme: the number of spatial quasi-co-location assumptions or beams that can be maintained by the UE, the number of transmission configuration indicator states supported by the UE, the number of transmission configuration indicator code points supported by the UE, or any combination thereof.

23. The method according to claim 18, wherein, Sending the indication of the communication scheme includes: Sending the indication of the communication scheme in a mode indicator field of a radio resource control message.

24. The method according to claim 18, wherein Sending the indication of the communication scheme includes: Sending a downlink control information message including the indication of the communication scheme.

25. The method according to claim 24, wherein, The indication of the communication scheme includes one or more of the following: an explicit indication in the downlink control information message; a value of a time domain resource allocation table field indicating an entry in the time domain resource allocation table associated with the indication of the downlink control information message and the indicated communication scheme; and a value of a transmission configuration indicator field of the downlink control information message indicating multiple transmission configuration indicator states.

26. The method according to claim 24, wherein, The downlink control information message further includes an antenna port field, the antenna port field indicating a plurality of code division multiplexing groups to indicate that the indicated communication scheme includes the spatial division multiplexing scheme.

27. The method according to claim 24, wherein The downlink control information message further includes an antenna port field, the antenna port field indicating a single code division multiplexing group to indicate that the indicated communication scheme includes the spatial division multiplexing scheme.

28. An apparatus for wireless communication at a user equipment (UE), comprising: A processor; A memory coupled to the processor; And Instructions stored in the memory and executable by the processor to cause the apparatus to perform the following operations: Receiving a configuration of parameters indicating a spatial division multiplexing scheme and a single-frequency communication scheme for communication with a plurality of transmit-receive points supported by the UE, the parameters including a first set of parameters common to both the spatial division multiplexing scheme and the single-frequency communication scheme; Receiving an indication of a communication scheme for the UE to communicate with the plurality of transmit-receive points, the communication scheme including the spatial division multiplexing scheme, the single-frequency communication scheme, or a combination of the spatial division multiplexing scheme and the single-frequency communication scheme; And Communicating with the plurality of transmit-receive points according to the indicated communication scheme, at least using the first set of parameters common to both the spatial division multiplexing scheme and the single-frequency communication scheme.

29. An apparatus for wireless communication at a transmit-receive point, comprising: A processor; A memory coupled to the processor; And Instructions stored in the memory and executable by the processor to cause the apparatus to perform the following operations: Sending to a user equipment (UE) a configuration of parameters indicating a spatial division multiplexing scheme and a single-frequency communication scheme for communication with a plurality of transmit-receive points supported by the UE, the parameters including a first set of parameters common to both the spatial division multiplexing scheme and the single-frequency communication scheme; Sending to the UE an indication of a communication scheme for the UE to communicate with the plurality of transmit-receive points, the communication scheme including the spatial division multiplexing scheme, the single-frequency communication scheme, or a combination of the spatial division multiplexing scheme and the single-frequency communication scheme; and Sending signaling to the UE according to the indicated communication scheme, at least partially based on the first set of parameters common to both the spatial division multiplexing scheme and the single-frequency communication scheme.

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