WO2021207963A1

WO2021207963A1 - User equipment receiver based downlink channel repetition

Info

Publication number: WO2021207963A1
Application number: PCT/CN2020/084862
Authority: WO
Inventors: Qiaoyu Li; Chao Wei; Jing LEI; Hao Xu; Min Huang; Jing Dai; Chenxi HAO; Peter Pui Lok Ang; Hwan Joon Kwon; Wanshi Chen
Original assignee: Qualcomm Incorporated
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2021-10-21

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The UE may transmit, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The UE may receive the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.

Description

USER EQUIPMENT RECEIVER BASED DOWNLINK CHANNEL REPETITION

FIELD OF TECHNOLOGY

The following relates generally to wireless communications and more specifically to user equipment (UE) receiver based downlink channel repetition.

BACKGROUND

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-APro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal frequency division multiple access (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support user equipment (UE) receiver based downlink channel repetition. Generally, the described techniques provide solutions to configure/indicate the relationship (e.g., mapping) between the receive antenna of the UE and the repetition instance (s) for a multi-repetition downlink transmission in order for the UE to use the correct receive antenna to receive the corresponding downlink transmission repetition (s) . For example, a base station may transmit or otherwise convey a configuration signal to the UE that maps the receive port identifiers (e.g., the receive antennas/beams of the UE) with corresponding repetition (s) of a multi-repetition downlink transmission. For example, each receive antenna of the UE may be mapped to one or more repetitions of the downlink transmission, with the multi-repetition downlink transmission using two or more transmit beams of the base station. The UE may respond by transmitting uplink reference signals (e.g., a sounding reference signals (SRSs) ) using the receive port identifiers mapped according to the configuration signal for the base station (e.g., to help the base station with receive port identifications, channel estimates, and the like) . Accordingly, the base station may then transmit (and the UE may receive) the multi-repetition downlink transmission according to the mapping, e.g., the UE may use the appropriate receive port identifier to receive the corresponding repetition (s) of the multi-repetition downlink transmission.

A method of wireless communication at a UE is described. The method may include receiving a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, transmitting, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and receiving the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, memory coupled 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 signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, transmitting, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and receiving the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the configuration signal, a resource identifier for the one or more uplink reference signals, where each of the set of receive port identifiers of the UE may be mapped to the at least one repetition of the multi-repetition downlink transmission based on the resource identifier.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, where the first set of downlink reference signals may be time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission, and receiving a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, where the second set of downlink reference signals may be time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration signal includes a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the resource identifier includes at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, where the one or more uplink reference signals may be transmitted based on the repetition pattern, and receiving a first grant for the multi-repetition downlink transmission that identifies each of the set of receive port identifiers that may be mapped to the at least one repetition of the multi-repetition downlink transmission.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration signal includes at least one of a RRC signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a capability message indicating support for receive-antenna-port switching by the UE, where the configuration signal may be based on the capability message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, based on the capability message, the configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the mapping may be based on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates that the UE may be configured with one receive chain and two receive port identifiers, and the configuration signal configures one resource set identifier including two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers .

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates that the UE may be configured with one receive chain and two receive port identifiers, and the configuration signal configures two resource set identifiers that each include a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates that the UE may be configured with one receive chain and four receive port identifiers, and the configuration signal configures one resource set identifier including four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates that the UE may be configured with one receive chain and four receive port identifiers, and the configuration signal configures four resource set identifier including four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates that the UE may be configured with one receive chain and four receive port identifiers, and the configuration signal configures four resource set identifiers that each include a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates that the UE may be configured with two receive chains and four receive port identifiers, and the configuration signal configures a single resource set identifier.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the single resource set identifier includes two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the single resource set identifier includes four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the capability message indicates that the UE may be configured with two receive chain and four receive port identifiers, and the configuration signal configures multiple resource set identifiers that each include one or more reference signal resources and each of the one or more reference signal resources including a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern, and determining the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on the search space set, the control resource set, the repetition pattern, or a combination thereof.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the configuration signal, a search space set associated with a control signal, and determining the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on the search space set and associated control signal.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.

A method of wireless communication at a base station is described. The method may include transmitting, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, receiving, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and transmitting the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

An apparatus for wireless communication at a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

Another apparatus for wireless communication at a base station is described. The apparatus may include means for transmitting, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, receiving, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and transmitting the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, where the first set of downlink reference signals may be time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission, and transmitting a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, where the second set of downlink reference signals may be time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration signal includes a RRC signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the resource identifier includes at least one of a SRI, or a SRS resource set indicator, or a combination thereof.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, where the one or more uplink reference signals may be transmitted based on the repetition pattern, and transmitting a first grant for the multi-repetition downlink transmission that identifies each of the set of receive port identifiers that may be mapped to the at least one repetition of the multi-repetition downlink transmission.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a capability message from the UE indicating support for receive-antenna-port switching by the UE, where the configuration signal may be based on the capability message.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, based on the capability message, the configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communications that supports user equipment (UE) receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communication system that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 3 illustrates an example of a process that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 4 illustrates an example of a process that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 5 illustrates an example of a repetition configuration that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIGs. 6 and 7 show block diagrams of devices that support UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 8 shows a block diagram of a communications manager that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 9 shows a diagram of a system including a device that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIGs. 10 and 11 show block diagrams of devices that support UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 12 shows a block diagram of a communications manager that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIG. 13 shows a diagram of a system including a device that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

FIGs. 14 through 18 show flowcharts illustrating methods that support UE receiver based downlink channel repetition in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

Some wireless communication systems may support communications with a reduced capability user equipment (UE) . A reduced capability UE (e.g., a low tier UE, a New Radio (NR) -light UE, etc. ) may operate with one or more of a reduced transmit power, a reduced number of transmit and/or receive antennas, a reduced transmit/receive bandwidth, or reduced computational complexity. For example, a reduced capability UE may be a smart wearable device, an industrial sensor, a video surveillance device, etc. To overcome such reduced capabilities, some wireless communication systems may use increased repetitions for downlink transmissions (e.g., a physical downlink control channel (PDCCH) and/or a physical downlink shared channel (PDSCH) transmissions, which may more generally be referred to as a PDxCH transmission) . For example, repetitions in the PDxCH may be used to compensate for the coverage loss associated with fewer receive antennas. The techniques described herein may provide for a configuration signal to indicate/configure the UE with the relationship or mapping between the receive port identifier (e.g., the receive antenna, receive beam, etc., of the UE) with corresponding repetitions in a multi-repetition downlink transmission (e.g., a PDxCH transmission) . Although the described techniques are not limited to reduced capability UEs, such reduced capability UEs may thus reduce power consumption and conserve computational resources by improving reception of downlink transmissions according to the mapping.

Aspects of the disclosure are initially described in the context of wireless communications systems. Generally, the described techniques provide solutions to configure/indicate the relationship (e.g., mapping) between the receive antenna of the UE and the repetition instance (s) for a multi-repetition downlink transmission in order for the UE to use the correct receive antenna to receive the corresponding downlink transmission repetition (s) . For example, a base station may transmit or otherwise convey a configuration signal to the UE that maps the receive port identifiers (e.g., the receive antennas/beams of the UE) with corresponding repetition (s) of a multi-repetition downlink transmission. For example, each receive antenna of the UE may be mapped to one or more repetitions of the downlink transmission, with the multi-repetition downlink transmission using two or more transmit beams of the base station. The UE may respond by transmitting uplink reference signals (e.g., a sounding reference signals (SRSs) ) using the receive port identifiers mapped according to the configuration signal for the base station (e.g., to help the base station with receive port identifications, channel estimates, and the like) . Accordingly, the base station may then transmit (and the UE may receive) the multi-repetition downlink transmission according to the mapping, e.g., the UE may use the appropriate receive port identifier to receive the corresponding repetition (s) of the multi-repetition downlink transmission.

Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to UE receiver based downlink channel repetition.

FIG. 1 illustrates an example of a wireless communications system 100 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The wireless communications 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 communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-APro network, or a New Radio (NR) network. In some examples, the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

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

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

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

One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.

The UEs 115 and the base stations 105 may wirelessly communicate with one another 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 links 125. For example, a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-APro, NR) . Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.

In some examples (e.g., in a carrier aggregation configuration) , a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) and may be positioned according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .

The communication links 125 shown in the wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .

A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the base stations 105, the UEs 115, or both) may have hardware configurations that support communications over a particular carrier bandwidth or may be configurable to support communications over one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include base stations 105 or UEs 115 that support simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.

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

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

The time intervals for the base stations 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T _s =1/ (Δf _max·N _f) seconds, where Δf _max may represent the maximum supported subcarrier spacing, and N _f may represent the maximum supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .

Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing. Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems 100, a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N _f) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

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

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

Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) . In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.

A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) . A base station 105 may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers.

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

In some examples, a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

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

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

Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for the UEs 115 include entering a power saving deep sleep mode when not engaging in active communications, operating over a limited bandwidth (e.g., according to narrowband communications) , or a combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.

The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications. The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) . Ultra-reliable communications 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.

In some examples, a UE 115 may also be able to communicate 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 communications may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105. In some examples, groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.

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

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

Some of the network devices, such as a base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) . Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) . Each access network transmission entity 145 may include one or more antenna panels. In some configurations, various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .

The wireless communications 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 known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band, or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band. In some examples, the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the base stations 105, and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate use of antenna arrays within a device. The propagation of EHF transmissions, however, may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.

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

A base station 105 or a 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 a base station 105 or a 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, antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations. A base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.

The base stations 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , where multiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .

A base station 105 or a UE 115 may use beam sweeping techniques as part of beam forming operations. For example, a base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions. For example, the base station 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the base station 105.

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

In some examples, transmissions by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more sub-bands. The base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) . Although these techniques are described with reference to signals transmitted in one or more directions by a base station 105, a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .

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

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

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

A UE 115 may receive a configuration signal mapping each of a plurality of receive port identifiers of the UE 115 to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The UE 115 may transmit, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The UE 115 may receive the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.

A base station 105 may transmit, to a UE 115, a configuration signal mapping each of a plurality of receive port identifiers of the UE 115 to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The base station 105 may receive, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The base station 105 may transmit the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.

FIG. 2 illustrates an example of a wireless communication system 200 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. In some examples, wireless communication system 200 may implement aspects of wireless communication system 100. Wireless communication system 200 may include base station 205 and UE 210, which may be examples of the corresponding devices described herein.

In some aspects, wireless communication system 200 may support communications with a reduced capability UE. A reduced capability UE (e.g., a low tier UE, a NR-light UE, etc. ) may operate with one or more of a reduced transmit power, a reduced number of transmit and/or receive antennas, a reduced transmit/receive bandwidth, or reduced computational complexity. For example, a reduced capability UE may be a smart wearable device, an industrial sensor, a video surveillance device, etc. To overcome such reduced capabilities, some wireless communication systems may use increased repetitions for downlink transmissions (e.g., a PDCCH and/or a PDSCH transmissions, which may more generally be referred to as a PDxCH transmission) . For example, repetitions in the PDxCH may be used to compensate for the coverage loss associated with fewer receive antennas. The techniques described herein may provide for a configuration signal to indicate/configure the UE with the relationship or mapping between the receive port identifier (e.g., the receive antenna, receive beam, etc., of the UE) with corresponding repetitions in a multi-repetition downlink transmission (e.g., a PDxCH transmission) . However, it is to be understood that the described techniques are not limited to a reduced capability UE, but may be implemented by an advanced UE operating in a NR, NR-light, 5G, and the like, wireless network. Accordingly, UE 210 may be an example of a reduced capability UE, or may be an example of an advanced UE implementing the described techniques.

Wireless communication system 200 may also utilize time domain bundling. For example, base station 205 may configure a pattern of time domain demodulation reference signals (DMRSs) bundling. UE 210 may assume that the same spatial precoding is used for the DMRSs that shares the same frequency domain resource allocation and different time domain resource allocations within the same time domain bundle. The UEs, such as UE 210, may carry out joint channel estimation using the time domain bundled DMRS, which may improve channel estimation for a UE experiencing a low signal-to-noise-ratio (SNR) .

To reduce the complexity of a UE, such as UE 210, the UE may be configured with a limited number of receive antennas. By way of non-limiting example, UE 210 is configured with two receive antennas, which includes a first receive antenna 215 and a second receive antenna 220. Each receive antenna of UE 210 may be associated with a corresponding receive port identifier, such that the receive port identifier (or receive antenna identifier) of the first receive antenna 215 can distinguish that receive antenna from the second receive antenna 220. Similarly, the receive port identifier for the second receive antenna 220 can distinguish that receive antenna from the first receive antenna 215. Moreover, even though two receive antennas may be available at the UE, the UE may only be configured with one receive chain (e.g., to reduce cost) and utilize an antenna switcher to allow one receive antenna to be connected with the receive chain at a time. When the UE receives a repeated PDxCH transmission, the UE can switch between the receive antennas in order to obtain spatial receive diversity. For example, repetition zero (Rep#0) and repetition one (Rep#1) may be received by the first receive antenna 215, while repetition two (Rep#2) and repetition three (Rep#3) may be received by the second receive antenna 220. This technique may improve reception of the downlink transmission such that the total number of repetitions can be reduced from six repetitions to four repetitions using the two receive antennas, e.g., using the antenna switch implementation, (e.g., as compared to using a single receive antenna) . Base station 205 may configure the downlink transmission for time domain DMRS bundling for the repetitions associated with the same receive antenna.

If closed-looped precoding can be used by base station 205 (e.g., based on precoders determined by a sounding reference signals (SRS) from UE 210) , the optimal precoder for the different receive antennas of the UE may be different. For example, base station 205 may transmit one or more repetitions of the multi-repetition downlink transmission to UE 210 using a first precoder 225 and other repetitions using a 2nd precoder 230. It is to be understood that the precoder a base station 205 may be associated with a particular transmit antenna/transmit beam of base station 205. That is, the first precoder 225 may correspond to a first transmit antenna/transmit beam of base station 205 and the second precoder 230 may correspond to a second transmit antenna/transmit beam of base station 205. In the example illustrated in wireless communication system 200, the first receive antenna 215 of UE 210 may be configured or otherwise situated such that it is an optimal receive antenna to receive transmissions from base station 205 using the first precoder 225. Similarly, the second receive antenna 220 of UE 210 may be configured otherwise situated such that it is an optimal receive antenna to receive transmissions from base station 205 using the second precoder 230.

While utilizing these techniques may reduce the number of repetitions required for transmission, this also requires that base station 205 configure otherwise indicate the relationship between the receive antenna of UE 210 and the NR PDxCH repetition instances in order for UE 210 to use the proper receive antenna to receive the associated NR PDxCH repetitions. This may be even further problematic for a multi-repetition PDCCH transmission since there is no method for the base station to indicate the relationship between the receive antenna port and a PDCCH repetition.

Accordingly, aspects of the described techniques provide mechanisms for base station 205 to configure/indicate the relationship between the receive antennas of UE 210 and the NR-PDxCH repetition instances in order for UE 210 to use the proper receive antenna to receive the associated NR-PDxCH repetitions. In some examples, the configuration for/indication of the relationship may be based on the resource identifier for uplink reference signals (e.g., SRS) transmitted from UE 210 using different receive antennas (e.g., UE 210 may transmit SRSs using different transmit antennas of UE 210, with each transmit antenna corresponding to a particular receive antenna of UE 210) .

For example, base station 205 may transmit or otherwise convey a configuration signal to UE 210 that maps each of a plurality of receive port identifiers (e.g., with each receive port identifier being associated with a different receive antenna) of UE 210 to at least one repetition of a multi-repetition downlink transmission (e.g., a multi-repetition PDxCH transmission) . The different receive port identifiers of UE 210 may be mapped to different repetitions of the multi-repetition downlink transmission. The configuration signal may be a grant configuring the multi-repetition downlink transmission (e.g., a downlink control information (DCI) grant) , an RRC signal, a MAC control element (CE) , and the like.

In one example, the receive port identifiers may be based on SRS transmissions from UE 210 using its different receive antennas (e.g., receive antennas associated with the transmit antennas of UE 210) . For a subset of NR-PDCCH repetitions with respect to a set of NR-PDCCH repetitions, UE 210 may be configured with an associated receive antenna identifier. The receive antenna identifier may be based on SRS resource identifier (SRI) or SRS resource set indicator and UE 210 may associate the most recently transmitted SRS resources with the current received PDCCH repetitions to identify the indicated receive antenna (e.g., the receive antenna of UE 210 that is associated with the corresponding receive port identifier) . Accordingly, UE 210 may identify a resource identifier for one or more uplink reference signals (e.g., SRS) . Each of the plurality of receive port identifiers of UE 210 may be mapped to at least one repetition of the multi-repetition downlink transmission based on the receive port identifier. Base station 205 may use RRC signaling configuring UE 210 with a particular control resource set, search space set, etc., to convey/indicate the configuration mapping the receive port identifiers of UE 210 to the different repetitions of the multi-repetition downlink transmission.

The DMRS of the PDCCH repetitions that are associated with the same receive port identifier/receive antenna may be time domain bundled. Accordingly, UE 210 may receive a first set of downlink reference signals (e.g., DMRS) with a first subset of repetitions of the multi-repetition downlink transmission that are time domain bundled. Similarly, UE 210 may receive a second set of downlink reference signals (e.g., DMRS) with a second subset of repetitions of the multi-repetition downlink transmission that are also time domain bundled.

In response to the configuration signal and using the mapping, UE 210 may transmit one or more uplink reference signals (e.g., SRS) using transmission ports (e.g., transmit antennas) corresponding to each receive port identifier (e.g., receive antenna) that is mapped to at least one repetition of the multi-repetition downlink transmission. For example, UE 210 may transmit a first SRS (e.g., SRS#0) using a first transmit antenna corresponding to the first receive antenna 215 of UE 210 and a second SRS (e.g., SRS#1) using a second transmit antenna that corresponds to the second receive antenna 220 of UE 210. Base station 205 may utilize the uplink reference signals for channel estimation, to confirm/identify the receive port identifiers, and the like, of UE 210. Accordingly, base station 205 may transmit the multi-repetition downlink transmission to UE 210 according to the mapping and based on the uplink reference signals.

In some aspects, the described techniques may be based on UE capability reporting for receive antenna switching supported by UE 210. For example, UE 210 may transmit or otherwise convey a capability message to base station 205 that indicates support for receive-antenna-port switching by UE 210. The configuration signal may be based on the capability message. In some aspects, UE 210 may configure the capability message to indicate the number of receive chains and/or a number of receive antenna ports of UE 210. Accordingly, base station 205 may configure the configuration signal based on the capability of UE 210.

As discussed, in some examples the mapping may be based on SRS usage for receive-antenna switching. For example, UE 210 may be configured with SRS usage of “receive-antenna switch” for a certain SRS resource, which may be used to determine the receive port identifier for PDxCH repetitions. For such SRS used for receive antenna switching, UE 210 may be configured depending on the reported UE capabilities for receive antenna switching.

For example, the capability message may indicate that UE 210 is configured with one receive chain and two receive port identifiers (e.g., the first receive antenna 215 and the second receive antenna 220) . In one option, base station 205 may configure UE 210 with one SRS resource set that includes two single-port SRS resources, with the receive port identifier being determined by the SRI associated with each resource set. That is, the configuration signal may configure one resource set identifier comprising two single-port reference signal resources, with the two single-port reference signal resources separately mapped to one of the two receive port identifiers. In another option, base station 205 may configure UE 210 with two SRS resource sets (each SRS resource set is associated with a same receive antenna and the receive antenna identifier is determined by the SRS resource set indicator associated with each SRS resource set) . That is, the configuration signal may configure two resource set identifiers that each comprise a single-port reference signal resource, with each of the signal-port reference signal resources separately mapped to one of the two receive port identifiers.

In another example, the capability message may indicate that UE 210 is configured with one receive chain and four receive antennas (e.g., four receive port identifiers) . In one option, base station 205 may configure UE 210 with one SRS resource set that includes four single-port SRS resources, with the receive port identifier being determined by the SRI associated with each SRS resource. That is, the configuration signal may configure one resource set identifier including four single-port reference signal resources, with the four single-port reference signal resources separately mapped to one of the four receive port identifiers. In another option, base station 205 may configure UE 210 with four SRS resource sets (each SRS resource set may be associated with the same receive antenna) , with the receive port identifier being determined by the SRS resource set indicator associated with each SRS resource set. That is, the configuration signal may configure four resource set identifiers including four single-port reference signal resources, with the four single-port reference signal resources separately mapped to one of the four receive port identifiers.

In another example, the capability message may indicate that UE 210 is configured with two receive chains and four receive antennas (e.g., for receive port identifiers) . In one option, base station 205 may configure UE 210 with one SRS resource set, with the receive port identifier being determined by the SRI associated with each SRS resource. That is, the configuration signal may configure a single resource set identifier. In one example of this option, the SRS resource set may include two SRS resources, each with two SRS ports (e.g., UE 210 may transmit each SRS resource with two antennas) . That is, the single resource set identifier may include two dual-port reference signal resources, with each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers. In another example of this option, the SRS resource set may include four SRS resources, each with two SRS-ports (e.g., UE 210 may use any combination of two antennas to transmit each SRS resource) . That is, the single resource set identifier may include four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers. In another option, base station 205 may configure UE 210 with multiple SRS resource sets, each SRS resource set including one or more SRS resources with two SRS ports (each SRS resource set may be associated with the same two receive antenna combination) . That is, the configuration signal may configure multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources including a dual-port reference signal resource, with each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.

Accordingly, the configuration signal mapping the receive port identifiers (e.g., receive antennas) of UE 210 may be based on the capability message indicating a threshold number receive chains and/or a threshold number of receive antenna ports of UE 210.

FIG. 3 illustrates an example of a process 300 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. In some examples, process 300 may implement aspects of wireless communication systems 100 and/or 200. Aspects of process 300 may be implemented by base station 305 and/or UE 310, which may be examples of corresponding devices described herein.

As discussed above, aspects of the described techniques provide various mechanisms for base station 305 to configure UE 310 using a configuration signal that maps different receive port identifiers (e.g., receive antennas) of UE 310 to different repetitions in a multi-repetition downlink transmission (e.g., a multi-repetition PDxCH transmission) from base station 305. That is, for a subset number of NR-PDCCH repetitions with respect to a set of NR-PDCCH repetitions, UE 310 may be configured with an associated receive antenna identifier (e.g., receive port identifier corresponding to a particular receive antenna of UE 310) . The receive antenna identifier may be based on an SRI or SRS resource set indicator and UE 310 may associate the most recently transmitted SRS resources with the currently received PDSCH repetitions to identify the indicated receive antenna identifier (e.g., receive port identifier) . As also discussed, the DMRS of the PDCCH repetitions associated with the same receive antenna identifier of UE 310 may be time domain (TD) bundled. In some examples, these techniques may be based on capability reporting of UE 310.

For example and at 315, UE 310 may optionally transmit (and base station 305 may receive) a capability message. Broadly, the capability message may indicate support for receive-antenna-port switching by UE 310. In some examples, UE 310 may configure the capability message to indicate the number of receive chains and/or number of receive antenna ports of UE 310. It is to be understood that the described techniques are not limited to such UE capability reporting.

At 320, base station 305 may transmit (and UE 310 may receive) a configuration signal mapping each of a plurality of receive port identifiers of UE 310 to at least one repetition of a multi-repetition downlink transmission, with different receive port identifiers being mapped to different repetitions. In some aspects the configuration signal may be an example of an RRC signal (e.g., RRC configuration) that configures UE 310 with a particular control resource set, search space set, and the like. In the example illustrated in process 300, the configuration signal maps SRI#0 to the first two repetitions (Rep#0 and Rep#1) of the multi-repetition downlink transmission and SRI#1 to the last two repetitions (Rep#2 and Rep#3) of the multi-repetition downlink transmission. That is, UE 310 may be configured with a PDCCH repetition pattern that includes four repetitions and the following receive antenna identifiers: Rep#0 and Rep#1 are configured to be TD DMRS bundled and associated with SRI#0, while Rep#2 and Rep#3 are configured to be TD DMRS bundled and associated with SRI#1.

In some examples, the configuration signal indicating the mapping may be a DCI grant scheduling the multi-repetition downlink transmission, e.g., the DCI grant may explicitly and/or implicitly indicate the mapping. That is, the RRC signal may indicate the mapping and the DCI grant may activate or otherwise indicate that the mapping is being used for the multi-repetition downlink transmission being scheduled by the DCI grant.

At 325, UE 310 may transmit (and base station 305 may receive) a first of one or more uplink reference signals (e.g., SRS#0) using transmission ports (e.g., transmit antennas) corresponding to each receive port identifier (e.g., receive antenna) that is mapped to at least one repetition of the multi-repetition downlink transmission. Similarly and at 330, UE 310 may transmit (and base station 305 may receive) a second of one or more uplink reference signals (e.g., SRS#1) using transmissions ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. That is, UE 310 may have recently transmitted two SRS resources (associated with SRI#0 and SRI#1, respectively) , with each one being transmitted using respective transmit antennas of UE 310 (e.g., SRI#0 may be transmitted with a first transmit antenna using a first transmit beam of UE 310 and SRI#1 may be transmitted with a second transmit antenna using a second transmit beam of UE 310) .

Although process 300 shows the one or more uplink reference signals being transmitted after UE 310 receives the configuration signal from base station 305, it is to be understood that UE 310 may have transmitted the uplink reference signals previously using the different SRS resources, which are then used by base station 305 to configure the mapping between receive port identifiers of UE 310 and the different repetitions of the multi-repetition downlink transmission. That is, base station 305 may identify receive port identifiers of UE 310 based on the uplink reference signal transmissions (e.g., rather than or in addition to UE capability reporting) .

At 335, base station 305 may transmit (and UE 310 may receive) a first repetition (e.g., Rep#0) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . Similarly and at 340, base station 305 may transmit (and UE 310 may receive) a second repetition (e.g., Rep#1) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . The first repetition and the second repetition may be transmitted by base station 305 using the same precoder (e.g., precoder#0) . That is, the first repetition and the second repetition may be transmitted by base station 305 using the same transmit antenna corresponding to precoder#0. Similarly, the first repetition and the second repetition may be received by UE 310 using the same receive antenna (e.g., the same receive port identifier, which may correspond to receive antenna#0 of UE 310) corresponding to the mapping (e.g., as indicated in the configuration signal) . As discussed, the DMRS for the first and second repetitions may be TD bundled with the PDxCH repetition.

At 345, base station 305 may transmit (and UE 310 may receive) a third repetition (e.g., Rep#2) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . Similarly and at 350, base station 305 may transmit (and UE 310 may receive) a fourth repetition (e.g., Rep#3) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . The third repetition and the fourth repetition may be transmitted by base station 305 using the same precoder (e.g., precoder#1) . That is, the third repetition and the fourth repetition may be transmitted by base station 305 using the same transmit antenna corresponding to precoder#1. Similarly, the third repetition and the fourth repetition may be received by UE 310 using the same receive antenna (e.g., the same receive port identifier, which may correspond to receive antenna#1 of UE 310) corresponding to the mapping (e.g., as indicated in the configuration signal) . As discussed, the DMRS for the first and second repetitions may be TD bundled with the PDxCH repetition.

Accordingly, UE 310 may receive the PDCCH repetition following the configured repetition pattern, with the receive antenna for each repetition being determined based on the receive antenna identifiers, e.g., Rep#0 and Rep#1 are received using the receive antenna corresponding to the transmit antenna used to transmit the SRS resource with respect to SRI#0 and Rep#2 and Rep#3 are received using the receive antenna corresponding to the transmit antenna used to transmit the SRS resource with respect to SRI#1. That is, the configuration signal mapping the PDxCH repetitions to different SRIs may be used by UE 310 (e.g., based on its SRS transmissions using the different SRIs) to identify the receive antenna (e.g., based on the transmit antennas or transmit beams used for the previous SRS transmissions) to use for receiving the different repetitions of the multi-repetition PDxCH transmission.

FIG. 4 illustrates an example of a process 400 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. In some examples, process 400 may implement aspects of wireless communication systems 100 and/or 200 and/or process 300. Aspects of process 400 may be implemented by base station 405 and/or UE 410, which may be examples of corresponding devices described herein.

As discussed above, aspects of the described techniques provide various mechanisms for base station 405 to configure UE 410 using a configuration signal that maps different receive port identifiers (e.g., receive antennas) of UE 410 to different repetitions in a multi-repetition downlink transmission (e.g., a multi-repetition PDxCH transmission) from base station 405. That is, for a subset number of NR-PDSCH repetitions with respect to a set of NR-PDSCH repetitions, UE 410 may be configured with an associated receive antenna identifier (e.g., receive port identifier corresponding to a particular receive antenna of UE 410) . The receive antenna identifier may be based on an SRI or SRS resource set indicator and UE 410 may associate the most recently transmitted SRS resources with the currently received PDSCH repetitions to identify the indicated receive antenna identifier (e.g., receive port identifier) . As also discussed, the DMRS of the PDSCH repetitions associated with the same receive antenna identifier of UE 410 may be TD bundled. That is, UE 410 may be configured with TD bundled DMRS in the first half of any set of PDSCH repetitions and TD bundled DMRS in the second half of the same set of PDSCH repetitions. In some examples, these techniques may be based on capability reporting of UE 410.

For example and at 415, UE 410 may optionally transmit (and base station 405 may receive) a capability message. Broadly, the capability message may indicate support for receive-antenna-port switching by UE 410. In some examples, UE 410 may configure the capability message to indicate the number of receive chains and/or number of receive antenna ports of UE 410. It is to be understood that the described techniques are not limited to such UE capability reporting.

At 420, base station 405 may transmit (and UE 410 may receive) a configuration signal mapping each of a plurality of receive port identifiers of UE 410 to at least one repetition of a multi-repetition downlink transmission, with different receive port identifiers being mapped to different repetitions. In some aspects the configuration signal may be an example of an RRC signal (e.g., RRC configuration) that configures UE 410 with a particular control resource set, search space set, and the like. In the example illustrated in process 400, the configuration signal maps a DMRS TD bundle#0 to the first two repetitions (Rep#0 and Rep#1) of the multi-repetition downlink transmission and DMRS TD bundle#1 to the last two repetitions (Rep#2 and Rep#3) of the multi-repetition downlink transmission. That is, UE 410 may be configured with a PDSCH repetition pattern that includes four repetitions and the following receive antenna identifiers: Rep#0 and Rep#1 are configured to be associated with TD DMRS bundle#0 which may be associated with SRI#0, while Rep#2 and Rep#3 are configured to be associated with TD DMRS bundle#1 which may be associated with SRI#1.

At 425, UE 410 may transmit (and base station 405 may receive) a first of one or more uplink reference signals (e.g., SRS#0) using transmission ports (e.g., transmit antennas) corresponding to each receive port identifier (e.g., receive antenna) that is mapped to at least one repetition of the multi-repetition downlink transmission. Similarly and at 430, UE 410 may transmit (and base station 405 may receive) a second of one or more uplink reference signals (e.g., SRS#1) using transmissions ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. That is, UE 410 may have recently transmitted two SRS resources (associated with SRI#0 and SRI#1, respectively) , with each one being transmitted using respective transmit antennas of UE 410 (e.g., SRI#0 may be transmitted with a first transmit antenna using a first transmit beam of UE 410 and SRI#1 may be transmitted with a second transmit antenna using a second transmit beam of UE 410) .

At 435, base station 405 may transmit (and UE 410 may receive) a downlink DCI grant scheduling the multi-repetition downlink transmission (e.g., the PDSCH transmission) . The downlink DCI grant may schedule or otherwise indicate for UE 410 to receive four PDSCH repetitions. The downlink DCI grant may indicate two SRIs (e.g., SRI#0 and SRI#1) that are associated with a recently transmitted SRS resource set (e.g., SRS#0 and SRS#1 transmitted at 425 and 430, respectively) , with each SRI indicating a single SRS resource.

Although process 400 shows the one or more uplink reference signals being transmitted after UE 410 receives the configuration signal from base station 405, it is to be understood that UE 410 may have transmitted the uplink reference signals previously using the different SRS resources, which are then used by base station 405 to configure the mapping between receive port identifiers of UE 410 and the different repetitions of the multi-repetition downlink transmission. That is, base station 405 may identify receive port identifiers of UE 410 based on the uplink reference signal transmissions (e.g., rather than or in addition to UE capability reporting) .

At 440, base station 405 may transmit (and UE 410 may receive) a first repetition (e.g., Rep#0) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . Similarly and at 445, base station 405 may transmit (and UE 410 may receive) a second repetition (e.g., Rep#1) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . The first repetition and the second repetition may be transmitted by base station 405 using the same precoder (e.g., precoder#0) . That is, the first repetition and the second repetition may be transmitted by base station 405 using the same transmit antenna corresponding to precoder#0. Similarly, the first repetition and the second repetition may be received by UE 410 using the same receive antenna (e.g., the same receive port identifier, which may correspond to receive antenna#0 of UE 410) corresponding to the mapping (e.g., as indicated in the configuration signal) . As discussed, the DMRS for the first and second repetitions may be TD bundled with the PDxCH repetition.

At 450, base station 405 may transmit (and UE 410 may receive) a third repetition (e.g., Rep#2) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . Similarly and at 455, base station 405 may transmit (and UE 410 may receive) a fourth repetition (e.g., Rep#3) of the multi-repetition downlink transmission (e.g., the PDxCH transmission) . The third repetition and the fourth repetition may be transmitted by base station 405 using the same precoder (e.g., precoder#1) . That is, the third repetition and the fourth repetition may be transmitted by base station 405 using the same transmit antenna corresponding to precoder#1. Similarly, the third repetition and the fourth repetition may be received by UE 410 using the same receive antenna (e.g., the same receive port identifier, which may correspond to receive antenna#1 of UE 410) corresponding to the mapping (e.g., as indicated in the configuration signal) . As discussed, the DMRS for the first and second repetitions may be TD bundled with the PDxCH repetition.

Accordingly, UE 410 may receive the PDSCH repetitions following the configured repetition pattern, with the receive antenna for each repetition being determined based on the receive antenna identifiers, e.g., Rep#0 and Rep#1 are received using the receive antenna corresponding to the transmit antenna used to transmit the SRS resource with respect to SRI#0 and Rep#2 and Rep#3 are received using the receive antenna corresponding to the transmit antenna used to transmit the SRS resource with respect to SRI#1. That is, the configuration signal mapping the PDxCH repetitions to different SRIs may be used by UE 410 (e.g., based on its SRS transmissions using the different SRIs) to identify the receive antenna (e.g., based on the transmit antennas or transmit beams used for the previous SRS transmissions) to use for receiving the different repetitions of the multi-repetition PDxCH transmission.

That is, UE 410 may, based on the configuration signal, identify a repetition pattern of a multi-repetition downlink transmission, wherein the uplink reference signals are transmitted based on the repetition pattern. Accordingly, UE 410 may receive the grant from base station 405 for the multi-repetition downlink transmission that identifies the receive port identifiers that are mapped to the different repetitions of the multi-repetition downlink transmission. In this example, the configuration signal may be an RRC signal or a DCI grant that precedes the DCI grant received at 435.

FIG. 5 illustrates an example of a repetition configuration 500 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. In some examples, repetition configuration 500 may implement aspects of wireless communication systems 100 and/or 200 and/or processes 300 and/or 400. Aspects of repetition configuration 500 may be implemented by a base station and/or UE, which may be examples of corresponding devices described herein. Repetition configuration 500 illustrates a non-limiting example where the receive antenna identifiers (e.g., receive port identifiers) of the UE may be associated with different search space (SS) sets, control resource sets (CORESETs) , repetition patterns, and the like.

As discussed above, aspects of the described techniques provide various mechanisms for a base station to configure a UE using a configuration signal that maps different receive port identifiers (e.g., receive antennas) of the UE to different repetitions in a multi-repetition downlink transmission (e.g., a multi-repetition PDxCH transmission) from the base station. For example, the UE may be configured with one or more receive antenna identifiers that are associated with a configuration of a SS set, or a CORESET, and/or a repetition pattern (such as a PDCCH repetition pattern using the configured SS set and/or CORESET) . The receive antenna identifier may be based on the SRI or SRS resource indicator, and the UE may associate the most recently transmitted SRS resources with the current received PDCCH repetitions to identify the indicated receive antenna identifier.

Repetition configuration 500 illustrates an example where different SS sets, or a different CORESETS, or different PDCCH repetition patterns, may include different configurations of the receive antenna identifiers. For receiving the PDCCH associated with the same SS set, CORESET, and/or PDCCH repetition pattern, the UE may identify the receive antenna based on the associated configuration of receive antenna identifiers.

For example, the base station may or may not transmit a PDCCH to the UE using a SS set/CORESET associated with a certain receive antenna identifier. However, the UE may monitor all the SS sets/CORESETs using different associated receive antennas in order to identify a match of the base station precoder and the UE receive antenna. A PDCCH repetition pattern can include multiple SS sets/CORESETs, with different receive antenna identifiers in order to achieve the described techniques.

That is, in the example illustrated in repetition configuration 500 the base station may configure the UE with two SS sets (e.g., SS set#0 and SS set#1) and/or with two CORESETS (e.g., CORESET#0 and CORESET#1) , which are identified as a first SS set/CORESET 505 and a second SS set/CORESET 510. The base station may then transmit signals using the two SS sets/CORESETS using different precoders of the base station (e.g., using different transmit beams of the base station) . Each SS set/CORESET configured for the UE may be associated with a particular SRI. In the example illustrated in FIG. 5, the first SS set/CORESET 505 may be associated with SRI#0 and the second SS set/CORESET 510 may be associated with SRI#1.

The UE may monitor for signals received on any configured SS set/CORESET. When the UE receives a signal on a particular SS set/CORESET using a particular receive beam, this may indicate or otherwise identify the receive antenna identifier (e.g., receive port identifier) corresponding to that SS set/CORESET. For example, if the UE receives a signal during one or more instances (e.g., 505-a, 505-b, and/or 505-c) of the first SS set/CORESET 505, then it knows that the receive antenna used to receive the signal corresponds to SRI#0. Similarly, if the UE receives a signal during one or more instances (e.g., 510-a, 510-b, and/or 510-c) of the second SS set/CORESET 510, then it knows that the receive antenna used to receive the signal corresponds to SRI#1. In another example, if the UE receives signals using a particular repetition pattern, this may indicate the mapping. For example, if the UE receives signals during each instances (e.g., 505-a, 505-b, and 505-c) of the first SS set/CORESET 505 and each instance (e.g., 510-a, 510-b, and 510-c) of the second SS set/CORESET 510, then it knows that the receive antenna used to receive the corresponding signals and can identify the corresponding SRI association, e.g., that the first SS set/CORESET 505 corresponds to SRI#0 and that the second SS set/CORESET 510 corresponds to SRI#1.

Accordingly, the UE may identify at least one of a SS set, a CORESET, and/or a repetition pattern based on the configuration signal. The UE may be able to determine the mapping between the plurality of receive port identifiers of the UE to at least one repetition of the multi-repetition downlink transmission based on the SS set, CORESET, and/or repetition pattern.

It is to be understood that repetition configuration 500 illustrates one non-limiting example of SS set/CORESET/repetition pattern that can be configured according to the described techniques. However, other patterns may also be utilized in order to convey or otherwise indicate the mapping in accordance with the described techniques.

FIG. 6 shows a block diagram 600 of a device 605 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communications manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to UE receiver based downlink channel repetition, etc. ) . Information may be passed on to other components of the device 605. The receiver 610 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 610 may utilize a single antenna or a set of antennas.

The communications manager 615 may receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals. The communications manager 615 may be an example of aspects of the communications manager 910 described herein.

The communications manager 615, or its sub-components, may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 615, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

The communications manager 615, or its sub-components, may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 615, or its sub-components, may be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 615, or its sub-components, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

The transmitter 620 may transmit signals generated by other components of the device 605. In some examples, the transmitter 620 may be collocated with a receiver 610 in a transceiver module. For example, the transmitter 620 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 620 may utilize a single antenna or a set of antennas.

FIG. 7 shows a block diagram 700 of a device 705 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The device 705 may be an example of aspects of a device 605, or a UE 115 as described herein. The device 705 may include a receiver 710, a communications manager 715, and a transmitter 735. The device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to UE receiver based downlink channel repetition, etc. ) . Information may be passed on to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 710 may utilize a single antenna or a set of antennas.

The communications manager 715 may be an example of aspects of the communications manager 615 as described herein. The communications manager 715 may include a configuration signal manager 720, a RS transmission manager 725, and a downlink transmission manager 730. The communications manager 715 may be an example of aspects of the communications manager 910 described herein.

The configuration signal manager 720 may receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission.

The RS transmission manager 725 may transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission.

The downlink transmission manager 730 may receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

The transmitter 735 may transmit signals generated by other components of the device 705. In some examples, the transmitter 735 may be collocated with a receiver 710 in a transceiver module. For example, the transmitter 735 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 735 may utilize a single antenna or a set of antennas.

FIG. 8 shows a block diagram 800 of a communications manager 805 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The communications manager 805 may be an example of aspects of a communications manager 615, a communications manager 715, or a communications manager 910 described herein. The communications manager 805 may include a configuration signal manager 810, a RS transmission manager 815, a downlink transmission manager 820, a resource identifier manager 825, a grant manager 830, an UE capability manager 835, a control resource manager 840, a search space manager 845, and a repetition mapping manager 850. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The configuration signal manager 810 may receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. In some cases, the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE. In some cases, the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.

The RS transmission manager 815 may transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission.

The downlink transmission manager 820 may receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

The resource identifier manager 825 may identify, based on the configuration signal, a resource identifier for the one or more uplink reference signals, where each of the set of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based on the resource identifier. In some examples, the resource identifier manager 825 may receive a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, where the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission. In some examples, the resource identifier manager 825 may receive a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, where the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission. In some cases, the configuration signal includes a RRC signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE. In some cases, the resource identifier includes at least one of a SRI, or a SRS resource set indicator, or a combination thereof.

The grant manager 830 may identify, based on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, where the one or more uplink reference signals are transmitted based on the repetition pattern. In some examples, the grant manager 830 may receive a first grant for the multi-repetition downlink transmission that identifies each of the set of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission. In some cases, the configuration signal includes at least one of a RRC signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.

The UE capability manager 835 may transmit a capability message indicating support for receive-antenna-port switching by the UE, where the configuration signal is based on the capability message. In some examples, the UE capability manager 835 may receive, based on the capability message, the configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission. In some cases, the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof. In some cases, the mapping is based on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof. In some cases, the capability message indicates that the UE is configured with one receive chain and two receive port identifiers.

In some cases, the configuration signal configures one resource set identifier including two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers. In some cases, the configuration signal configures two resource set identifiers that each include a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers. In some cases, the capability message indicates that the UE is configured with one receive chain and four receive port identifiers. In some cases, the configuration signal configures one resource set identifier including four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers. In some cases, the configuration signal configures four resource set identifier including four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers. In some cases, the configuration signal configures four resource set identifiers that each include a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.

In some cases, the capability message indicates that the UE is configured with two receive chains and four receive port identifiers. In some cases, the configuration signal configures a single resource set identifier. In some cases, the single resource set identifier includes two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers. In some cases, the single resource set identifier includes four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers. In some cases, the capability message indicates that the UE is configured with two receive chain and four receive port identifiers. In some cases, the configuration signal configures multiple resource set identifiers that each include one or more reference signal resources and each of the one or more reference signal resources including a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.

The control resource manager 840 may identify, based on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern. In some examples, the control resource manager 840 may determine the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on the search space set, the control resource set, the repetition pattern, or a combination thereof.

The search space manager 845 may identify, based on the configuration signal, a search space set associated with a control signal. In some examples, the search space manager 845 may determine the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on the search space set and associated control signal.

The repetition mapping manager 850 may identify the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.

FIG. 9 shows a diagram of a system 900 including a device 905 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The device 905 may be an example of or include the components of device 605, device 705, or a UE 115 as described herein. The device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 910, an I/O controller 915, a transceiver 920, an antenna 925, memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945) .

The communications manager 910 may receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

The I/O controller 915 may manage input and output signals for the device 905. The I/O controller 915 may also manage peripherals not integrated into the device 905. In some cases, the I/O controller 915 may represent a physical connection or port to an external peripheral. In some cases, the I/O controller 915 may utilize an operating system such as

or another known operating system. In other cases, the I/O controller 915 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller 915 may be implemented as part of a processor. In some cases, a user may interact with the device 905 via the I/O controller 915 or via hardware components controlled by the I/O controller 915.

The transceiver 920 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 920 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 920 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 925. However, in some cases the device may have more than one antenna 925, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

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 including instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 930 may contain, among other things, a basic input/output system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 940 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting UE receiver based downlink channel repetition) .

The code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or other 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 functions described herein.

FIG. 10 shows a block diagram 1000 of a device 1005 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The device 1005 may be an example of aspects of a base station 105 as described herein. The device 1005 may include a receiver 1010, a communications manager 1015, and a transmitter 1020. The device 1005 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to UE receiver based downlink channel repetition, etc. ) . Information may be passed on to other components of the device 1005. The receiver 1010 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The receiver 1010 may utilize a single antenna or a set of antennas.

The communications manager 1015 may transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals. The communications manager 1015 may be an example of aspects of the communications manager 1310 described herein.

The communications manager 1015, or its sub-components, may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 1015, or its sub-components may be executed by a general-purpose processor, a DSP, an ASIC, a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

The communications manager 1015, or its sub-components, may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 1015, or its sub-components, may be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 1015, or its sub-components, may be combined with one or more other hardware components, including but not limited to an I/O component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

The transmitter 1020 may transmit signals generated by other components of the device 1005. In some examples, the transmitter 1020 may be collocated with a receiver 1010 in a transceiver module. For example, the transmitter 1020 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The transmitter 1020 may utilize a single antenna or a set of antennas.

FIG. 11 shows a block diagram 1100 of a device 1105 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The device 1105 may be an example of aspects of a device 1005, or a base station 105 as described herein. The device 1105 may include a receiver 1110, a communications manager 1115, and a transmitter 1135. The device 1105 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to UE receiver based downlink channel repetition, etc. ) . Information may be passed on to other components of the device 1105. The receiver 1110 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The receiver 1110 may utilize a single antenna or a set of antennas.

The communications manager 1115 may be an example of aspects of the communications manager 1015 as described herein. The communications manager 1115 may include a configuration signal manager 1120, a RS reception manager 1125, and a downlink transmission manager 1130. The communications manager 1115 may be an example of aspects of the communications manager 1310 described herein.

The configuration signal manager 1120 may transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission.

The RS reception manager 1125 may receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission.

The downlink transmission manager 1130 may transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

The transmitter 1135 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1135 may be collocated with a receiver 1110 in a transceiver module. For example, the transmitter 1135 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The transmitter 1135 may utilize a single antenna or a set of antennas.

FIG. 12 shows a block diagram 1200 of a communications manager 1205 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The communications manager 1205 may be an example of aspects of a communications manager 1015, a communications manager 1115, or a communications manager 1310 described herein. The communications manager 1205 may include a configuration signal manager 1210, a RS reception manager 1215, a downlink transmission manager 1220, a resource identifier manager 1225, a grant manager 1230, an UE capability manager 1235, a control resource manager 1240, a search space manager 1245, and a repetition mapping manager 1250. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The configuration signal manager 1210 may transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. In some cases, the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE. In some cases, the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.

The RS reception manager 1215 may receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission.

The downlink transmission manager 1220 may transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

The resource identifier manager 1225 may identify, based on the configuration signal, a resource identifier for the one or more uplink reference signals, where each of the set of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based on the resource identifier. In some examples, the resource identifier manager 1225 may transmit a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, where the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission. In some examples, the resource identifier manager 1225 may transmit a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, where the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.

In some cases, the configuration signal includes a RRC signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE. In some cases, the resource identifier includes at least one of a SRI, or a SRS resource set indicator, or a combination thereof.

The grant manager 1230 may identify, based on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, where the one or more uplink reference signals are transmitted based on the repetition pattern. In some examples, the grant manager 1230 may transmit a first grant for the multi-repetition downlink transmission that identifies each of the set of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission. In some cases, the configuration signal includes at least one of a RRC signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.

The UE capability manager 1235 may receive a capability message from the UE indicating support for receive-antenna-port switching by the UE, where the configuration signal is based on the capability message. In some examples, the UE capability manager 1235 may transmit, based on the capability message, the configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.

In some cases, the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof. In some cases, the mapping is based on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.

In some cases, the capability message indicates that the UE is configured with one receive chain and two receive port identifiers. In some cases, the configuration signal configures one resource set identifier including two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers. In some cases, the configuration signal configures two resource set identifiers that each include a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.

In some cases, the capability message indicates that the UE is configured with one receive chain and four receive port identifiers. In some cases, the configuration signal configures one resource set identifier including four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers. In some cases, the configuration signal configures four resource set identifier including four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers. In some cases, the configuration signal configures four resource set identifiers that each include a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.

In some cases, the capability message indicates that the UE is configured with two receive chains and four receive port identifiers. In some cases, the configuration signal configures a single resource set identifier. In some cases, the single resource set identifier includes two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers. In some cases, the single resource set identifier includes four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.

In some cases, the capability message indicates that the UE is configured with two receive chain and four receive port identifiers. In some cases, the configuration signal configures multiple resource set identifiers that each include one or more reference signal resources and each of the one or more reference signal resources including a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.

The control resource manager 1240 may identify, based on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern. In some examples, the control resource manager 1240 may determine the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on the search space set, the control resource set, the repetition pattern, or a combination thereof.

The search space manager 1245 may identify, based on the configuration signal, a search space set associated with a control signal. In some examples, the search space manager 1245 may determine the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on the search space set and associated control signal.

The repetition mapping manager 1250 may identify the mapping between each of the set of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.

FIG. 13 shows a diagram of a system 1300 including a device 1305 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The device 1305 may be an example of or include the components of device 1005, device 1105, or a base station 105 as described herein. The device 1305 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1310, a network communications manager 1315, a transceiver 1320, an antenna 1325, memory 1330, a processor 1340, and an inter-station communications manager 1345. These components may be in electronic communication via one or more buses (e.g., bus 1350) .

The communications manager 1310 may transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission, receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission, and transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals.

The network communications manager 1315 may manage communications with the core network (e.g., via one or more wired backhaul links) . For example, the network communications manager 1315 may manage the transfer of data communications for client devices, such as one or more UEs 115.

The transceiver 1320 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 1320 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1320 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1325. However, in some cases the device may have more than one antenna 1325, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 1330 may include RAM, ROM, or a combination thereof. The memory 1330 may store computer-readable code 1335 including instructions that, when executed by a processor (e.g., the processor 1340) cause the device to perform various functions described herein. In some cases, the memory 1330 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 1340 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the processor 1340 may be configured to operate a memory array using a memory controller. In some cases, a memory controller may be integrated into processor 1340. The processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1330) to cause the device 1305 to perform various functions (e.g., functions or tasks supporting UE receiver based downlink channel repetition) .

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

The code 1335 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1335 may not be directly executable by the processor 1340 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 14 shows a flowchart illustrating a method 1400 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The operations of method 1400 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1400 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1405, the UE may receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by a configuration signal manager as described with reference to FIGs. 6 through 9.

At 1410, the UE may transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by a RS transmission manager as described with reference to FIGs. 6 through 9.

At 1415, the UE may receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed by a downlink transmission manager as described with reference to FIGs. 6 through 9.

FIG. 15 shows a flowchart illustrating a method 1500 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The operations of method 1500 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1500 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1505, the UE may receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by a configuration signal manager as described with reference to FIGs. 6 through 9.

At 1510, the UE may identify, based on the configuration signal, a resource identifier for the one or more uplink reference signals, where each of the set of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based on the resource identifier. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by a resource identifier manager as described with reference to FIGs. 6 through 9.

At 1515, the UE may transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by a RS transmission manager as described with reference to FIGs. 6 through 9.

At 1520, the UE may receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by a downlink transmission manager as described with reference to FIGs. 6 through 9.

FIG. 16 shows a flowchart illustrating a method 1600 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The operations of method 1600 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1600 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1605, the UE may receive a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed by a configuration signal manager as described with reference to FIGs. 6 through 9.

At 1610, the UE may identify, based on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, where the one or more uplink reference signals are transmitted based on the repetition pattern. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by a grant manager as described with reference to FIGs. 6 through 9.

At 1615, the UE may transmit, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed by a RS transmission manager as described with reference to FIGs. 6 through 9.

At 1620, the UE may receive a first grant for the multi-repetition downlink transmission that identifies each of the set of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by a grant manager as described with reference to FIGs. 6 through 9.

At 1625, the UE may receive the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed by a downlink transmission manager as described with reference to FIGs. 6 through 9.

FIG. 17 shows a flowchart illustrating a method 1700 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by a base station 105 or its components as described herein. For example, the operations of method 1700 may be performed by a communications manager as described with reference to FIGs. 10 through 13. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At 1705, the base station may transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a configuration signal manager as described with reference to FIGs. 10 through 13.

At 1710, the base station may receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a RS reception manager as described with reference to FIGs. 10 through 13.

At 1715, the base station may transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by a downlink transmission manager as described with reference to FIGs. 10 through 13.

FIG. 18 shows a flowchart illustrating a method 1800 that supports UE receiver based downlink channel repetition in accordance with aspects of the present disclosure. The operations of method 1800 may be implemented by a base station 105 or its components as described herein. For example, the operations of method 1800 may be performed by a communications manager as described with reference to FIGs. 10 through 13. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At 1805, the base station may receive a capability message from the UE indicating support for receive-antenna-port switching by the UE, where the configuration signal is based on the capability message. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed by an UE capability manager as described with reference to FIGs. 10 through 13.

At 1810, the base station may transmit, to a UE, a configuration signal mapping each of a set of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, where different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a configuration signal manager as described with reference to FIGs. 10 through 13.

At 1815, the base station may receive, based on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed by a RS reception manager as described with reference to FIGs. 10 through 13.

At 1820, the base station may transmit the multi-repetition downlink transmission according to the mapping and based on the one or more uplink reference signals. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed by a downlink transmission manager as described with reference to FIGs. 10 through 13.

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

Although aspects of an LTE, LTE-A, LTE-APro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-APro, or NR networks. For example, the described techniques may be applicable to various other wireless communications 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, as well as other systems and radio technologies not explicitly mentioned herein.

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

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with 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. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .

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

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include random-access memory (RAM) , read-only memory (ROM) , electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a 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. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”

In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration, ” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A method for wireless communication at a user equipment (UE) , comprising:

receiving a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

transmitting, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

receiving the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The method of claim 1, further comprising:

identifying, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The method of claim 2, further comprising:

receiving a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

receiving a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The method of claim 2, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The method of claim 2, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The method of claim 1, further comprising:

identifying, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

receiving a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The method of claim 6, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The method of claim 1, further comprising:

transmitting a capability message indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The method of claim 8, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The method of claim 8, further comprising:

receiving, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The method of claim 10, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The method of claim 8, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The method of claim 8, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The method of claim 8, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The method of claim 8, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The method of claim 8, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The method of claim 8, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The method of claim 17, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The method of claim 17, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The method of claim 8, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The method of claim 1, further comprising:

identifying, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The method of claim 1, further comprising:

identifying, based at least in part on the configuration signal, a search space set associated with a control signal; and

determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The method of claim 1, further comprising:

identifying the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The method of claim 1, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The method of claim 1, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
A method for wireless communication at a base station, comprising:

transmitting, to a user equipment (UE) , a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

receiving, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

transmitting the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The method of claim 26, further comprising:

identifying, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The method of claim 27, further comprising:

transmitting a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

transmitting a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The method of claim 27, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The method of claim 27, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The method of claim 26, further comprising:

identifying, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

transmitting a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The method of claim 31, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The method of claim 26, further comprising:

receiving a capability message from the UE indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The method of claim 33, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The method of claim 33, further comprising:

transmitting, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The method of claim 35, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The method of claim 33, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The method of claim 33, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The method of claim 33, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The method of claim 33, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The method of claim 33, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The method of claim 33, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The method of claim 42, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The method of claim 42, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The method of claim 33, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The method of claim 26, further comprising:

identifying, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The method of claim 26, further comprising:

identifying, based at least in part on the configuration signal, a search space set associated with a control signal; and

determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The method of claim 26, further comprising:

identifying the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The method of claim 26, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The method of claim 26, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
An apparatus for wireless communication at a user equipment (UE) , comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receive a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

transmit, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

receive the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The apparatus of claim 51, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The apparatus of claim 52, wherein the instructions are further executable by the processor to cause the apparatus to:

receive a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

receive a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The apparatus of claim 52, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The apparatus of claim 52, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The apparatus of claim 51, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

receive a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The apparatus of claim 56, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The apparatus of claim 51, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit a capability message indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The apparatus of claim 58, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 58, wherein the instructions are further executable by the processor to cause the apparatus to:

receive, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The apparatus of claim 60, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 58, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 58, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 58, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 58, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 58, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 58, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The apparatus of claim 67, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 67, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 58, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 51, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The apparatus of claim 51, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, a search space set associated with a control signal; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The apparatus of claim 51, wherein the instructions are further executable by the processor to cause the apparatus to:

identify the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The apparatus of claim 51, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The apparatus of claim 51, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
An apparatus for wireless communication at a base station, comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmit, to a user equipment (UE) , a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

receive, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

transmit the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The apparatus of claim 76, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The apparatus of claim 77, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

transmit a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The apparatus of claim 77, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The apparatus of claim 77, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The apparatus of claim 76, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

transmit a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The apparatus of claim 81, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The apparatus of claim 76, wherein the instructions are further executable by the processor to cause the apparatus to:

receive a capability message from the UE indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The apparatus of claim 83, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 83, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The apparatus of claim 85, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 83, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 83, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 83, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 83, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 83, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 83, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The apparatus of claim 92, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 92, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 83, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 76, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The apparatus of claim 76, wherein the instructions are further executable by the processor to cause the apparatus to:

identify, based at least in part on the configuration signal, a search space set associated with a control signal; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The apparatus of claim 76, wherein the instructions are further executable by the processor to cause the apparatus to:

identify the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The apparatus of claim 76, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The apparatus of claim 76, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
An apparatus for wireless communication at a user equipment (UE) , comprising:

means for receiving a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

means for transmitting, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

means for receiving the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The apparatus of claim 101, further comprising:

means for identifying, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The apparatus of claim 102, further comprising:

means for receiving a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

means for receiving a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The apparatus of claim 102, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The apparatus of claim 102, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The apparatus of claim 101, further comprising:

means for identifying, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

means for receiving a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The apparatus of claim 106, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The apparatus of claim 101, further comprising:

means for transmitting a capability message indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The apparatus of claim 108, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 108, further comprising:

means for receiving, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The apparatus of claim 110, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 108, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 108, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 108, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 108, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 108, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 108, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The apparatus of claim 117, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 117, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 108, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 101, further comprising:

means for identifying, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

means for determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The apparatus of claim 101, further comprising:

means for identifying, based at least in part on the configuration signal, a search space set associated with a control signal; and

means for determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The apparatus of claim 101, further comprising:

means for identifying the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The apparatus of claim 101, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The apparatus of claim 101, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
An apparatus for wireless communication at a base station, comprising:

means for transmitting, to a user equipment (UE) , a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

means for receiving, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

means for transmitting the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The apparatus of claim 126, further comprising:

means for identifying, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The apparatus of claim 127, further comprising:

means for transmitting a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

means for transmitting a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The apparatus of claim 127, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The apparatus of claim 127, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The apparatus of claim 126, further comprising:

means for identifying, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

means for transmitting a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The apparatus of claim 131, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The apparatus of claim 126, further comprising:

means for receiving a capability message from the UE indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The apparatus of claim 133, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 133, further comprising:

means for transmitting, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The apparatus of claim 135, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The apparatus of claim 133, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 133, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The apparatus of claim 133, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 133, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 133, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The apparatus of claim 133, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The apparatus of claim 142, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 142, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 133, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The apparatus of claim 126, further comprising:

means for identifying, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

means for determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The apparatus of claim 126, further comprising:

means for identifying, based at least in part on the configuration signal, a search space set associated with a control signal; and

means for determining the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The apparatus of claim 126, further comprising:

means for identifying the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The apparatus of claim 126, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The apparatus of claim 126, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE) , the code comprising instructions executable by a processor to:

receive a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

transmit, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

receive the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The non-transitory computer-readable medium of claim 151, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The non-transitory computer-readable medium of claim 152, wherein the instructions are further executable to:

receive a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

receive a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 152, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The non-transitory computer-readable medium of claim 152, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The non-transitory computer-readable medium of claim 151, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

receive a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 156, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 151, wherein the instructions are further executable to:

transmit a capability message indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The non-transitory computer-readable medium of claim 158, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The non-transitory computer-readable medium of claim 158, wherein the instructions are further executable to:

receive, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 160, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The non-transitory computer-readable medium of claim 158, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The non-transitory computer-readable medium of claim 158, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The non-transitory computer-readable medium of claim 158, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The non-transitory computer-readable medium of claim 158, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The non-transitory computer-readable medium of claim 158, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The non-transitory computer-readable medium of claim 158, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The non-transitory computer-readable medium of claim 167, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The non-transitory computer-readable medium of claim 167, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The non-transitory computer-readable medium of claim 158, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The non-transitory computer-readable medium of claim 151, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The non-transitory computer-readable medium of claim 151, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, a search space set associated with a control signal; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The non-transitory computer-readable medium of claim 151, wherein the instructions are further executable to:

identify the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The non-transitory computer-readable medium of claim 151, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The non-transitory computer-readable medium of claim 151, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to:

transmit, to a user equipment (UE) , a configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission, wherein different receive port identifiers are mapped to different repetitions of the multi-repetition downlink transmission;

receive, based at least in part on the mapping, one or more uplink reference signals using transmission ports corresponding to each receive port identifier that is mapped to at least one repetition of the multi-repetition downlink transmission; and

transmit the multi-repetition downlink transmission according to the mapping and based at least in part on the one or more uplink reference signals.
The non-transitory computer-readable medium of claim 176, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, a resource identifier for the one or more uplink reference signals, wherein each of the plurality of receive port identifiers of the UE are mapped to the at least one repetition of the multi-repetition downlink transmission based at least in part on the resource identifier.
The non-transitory computer-readable medium of claim 177, wherein the instructions are further executable to:

transmit a first set of downlink reference signals with a first subset of repetitions of the multi-repetition downlink transmission, wherein the first set of downlink reference signals are time-domain bundled with the first subset of repetitions of the multi-repetition downlink transmission; and

transmit a second set of downlink reference signals with a second subset of repetitions of the multi-repetition downlink transmission, wherein the second set of downlink reference signals are time-domain bundled with the second subset of repetitions of the multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 177, wherein the configuration signal comprises a radio resource control (RRC) signal configuring at least one of a control resource set, or a search space set, or a combination thereof, for the UE.
The non-transitory computer-readable medium of claim 177, wherein the resource identifier comprises at least one of a sounding reference signal (SRS) resource indicator (SRI) , or a SRS resource set indicator, or a combination thereof.
The non-transitory computer-readable medium of claim 176, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, a repetition pattern for the multi-repetition downlink transmission, wherein the one or more uplink reference signals are transmitted based at least in part on the repetition pattern; and

transmit a first grant for the multi-repetition downlink transmission that identifies each of the plurality of receive port identifiers that are mapped to the at least one repetition of the multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 181, wherein the configuration signal comprises at least one of a radio resource control (RRC) signal, or a second grant, or a combination thereof, configuring the multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 176, wherein the instructions are further executable to:

receive a capability message from the UE indicating support for receive-antenna-port switching by the UE, wherein the configuration signal is based at least in part on the capability message.
The non-transitory computer-readable medium of claim 183, wherein the capability message indicates at least one of a number of receive chains of the UE, or a number of receive antenna ports of the UE, or a combination thereof.
The non-transitory computer-readable medium of claim 183, wherein the instructions are further executable to:

transmit, based at least in part on the capability message, the configuration signal mapping each of a plurality of receive port identifiers of the UE to at least one repetition of a multi-repetition downlink transmission.
The non-transitory computer-readable medium of claim 185, wherein the mapping is based at least in part on the capability message indicating at least one of a first threshold number of receive chains of the UE, or a second threshold number of receive antenna ports of the UE, or a combination thereof.
The non-transitory computer-readable medium of claim 183, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures one resource set identifier comprising two single-port reference signal resources, the two single-port reference signal resources separately mapped to one of the two receive port identifiers.
The non-transitory computer-readable medium of claim 183, wherein:

the capability message indicates that the UE is configured with one receive chain and two receive port identifiers; and

the configuration signal configures two resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the two receive port identifiers.
The non-transitory computer-readable medium of claim 183, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures one resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The non-transitory computer-readable medium of claim 183, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifier comprising four single-port reference signal resources, the four single-port reference signal resources separately mapped to one of the four receive port identifiers.
The non-transitory computer-readable medium of claim 183, wherein:

the capability message indicates that the UE is configured with one receive chain and four receive port identifiers; and

the configuration signal configures four resource set identifiers that each comprise a single-port reference signal resources, each of the single-port reference signal resources separately mapped to one of the four receive port identifiers.
The non-transitory computer-readable medium of claim 183, wherein:

the capability message indicates that the UE is configured with two receive chains and four receive port identifiers; and

the configuration signal configures a single resource set identifier.
The non-transitory computer-readable medium of claim 192, wherein the single resource set identifier comprises two dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The non-transitory computer-readable medium of claim 192, wherein the single resource set identifier comprises four dual-port reference signal resources, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The non-transitory computer-readable medium of claim 183, wherein:

the capability message indicates that the UE is configured with two receive chain and four receive port identifiers; and

the configuration signal configures multiple resource set identifiers that each comprise one or more reference signal resources and each of the one or more reference signal resources comprising a dual-port reference signal resource, each of the dual-port reference signal resources separately mapped to two of the four receive port identifiers.
The non-transitory computer-readable medium of claim 176, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, at least one of a search space set, or a control resource set, or a repetition pattern; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set, the control resource set, the repetition pattern, or a combination thereof.
The non-transitory computer-readable medium of claim 176, wherein the instructions are further executable to:

identify, based at least in part on the configuration signal, a search space set associated with a control signal; and

determine the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based at least in part on the search space set and associated control signal.
The non-transitory computer-readable medium of claim 176, wherein the instructions are further executable to:

identify the mapping between each of the plurality of receive port identifiers of the UE to the at least one repetition of a multi-repetition downlink transmission based on at least one of a downlink control information scheduling the multi-repetition downlink transmission, or a slot index associated with the multi-repetition downlink transmission, or a starting symbol index associated with the multi-repetition downlink transmission, or a combination thereof.
The non-transitory computer-readable medium of claim 176, wherein the configuration signal maps even-indexed repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and odd-indexed repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.
The non-transitory computer-readable medium of claim 176, wherein the configuration signal maps a first set of contiguous repetitions of the multi-repetition downlink transmission to a first receive port identifier of the UE and a second set of contiguous repetitions of the multi-repetition downlink transmission to a second receive port identifier of the UE.