Method, apparatus and medium for wireless communication

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) configured for demodulation reference signal (DMRS) bundling may receive a control message scheduling a first and second set of repetitions for uplink transmissions. The UE may determine a phase coherence configuration to be applied to the DMRS transmissions corresponding to each set of repetitions. The phase coherence configuration may be determined based on a phase coherence capability of the UE, and the phase coherence configuration may specify that phase coherence is to be maintained for one or more of a first set of repetitions that are separated from one or more of a second set of repetitions. The UE may send a first set of repetitions and a first set of demodulation reference signals and a second set of repetitions and a second set of demodulation reference signals according to the phase coherence configuration.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. patent application serial number 17 / 151,102, filed on January 15, 2021, by Khoshnevisan et al., entitled “REFERENCESIGNAL BUNDLING FOR UPLINK CHANNEL REPETITION,” which is assigned to the assignee of this application. Technical Field

[0003] The following relates to wireless communications, including reference signal bundling for uplink channel repetition. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication with multiple communication devices, which may be referred to as user equipment (UE).

[0005] Wireless communication systems may support repetition of various channels to improve communication reliability, among other benefits. For example, a user equipment (UE) may be configured to repeat uplink data or control channel transmissions to increase the likelihood of successful reception at a base station. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices and apparatuses for supporting reference signal bundling for uplink channel repetition. In general, the described technology provides a user equipment (UE) configured for demodulation reference signal (DMRS) bundling to receive a control message for scheduling a first and second group of repetitions of uplink transmission. The UE can determine a phase coherence configuration to be applied to the DMRS transmission corresponding to each group of repetitions. The phase coherence configuration can be determined at least in part based on the phase coherence capability of the UE, and the phase coherence configuration can specify that phase coherence is to be maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The UE can send a first group of repetitions and a first group of demodulation reference signals and a second group of repetitions and a second group of demodulation reference signals according to the phase coherence configuration. The first group of repetitions and the second group of repetitions can differ from each other in various transmission parameters, frequency hopping, or both.

[0007] A method for wireless communication at a user equipment (UE) is described. The method may include receiving one or more control messages scheduling a first set of repetitions of uplink transmissions and a second set of repetitions of the uplink transmissions, determining a phase coherence configuration to be applied to the transmission of the first set of repetitions and the corresponding first set of demodulation reference signals and the transmission of the second set of repetitions and the corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions, and transmitting the first set of repetitions and the first set of demodulation reference signals and the second set of repetitions and the second set of demodulation reference signals according to the phase coherence configuration.

[0008] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to receive one or more control messages, one or more of which control scheduling of a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions, determine a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions, and send the first group of repetitions and the first group of demodulation reference signals, and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving one or more control messages scheduling a first set of repetitions of uplink transmissions and a second set of repetitions of the uplink transmissions, means for determining a phase coherence configuration to be applied to the transmission of the first set of repetitions and corresponding first set of demodulation reference signals and the transmission of the second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions, and means for transmitting the first set of repetitions and the first set of demodulation reference signals and the second set of repetitions and the second set of demodulation reference signals in accordance with the phase coherence configuration.

[0010] 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 one or more control messages that schedule a first set of repetitions for uplink transmissions and a second set of repetitions for uplink transmissions, determine a phase coherence configuration to be applied to the transmission of the first set of repetitions and corresponding first set of demodulation reference signals and the transmission of the second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions that are separated from one or more of the second set of repetitions, and transmit the first set of repetitions and the first set of demodulation reference signals, and the second set of repetitions and the second set of demodulation reference signals according to the phase coherence configuration.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for maintaining a first phase coherence for each demodulation reference signal transmission corresponding to a first set of repetitions according to a phase coherence configuration and maintaining a second phase coherence for each demodulation reference signal transmission corresponding to a second set of repetitions according to the phase coherence configuration.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a control message indicating a mapping scheme, and the UE may use the mapping scheme to send one or more of the first set of repetitions and one or more of the second set of repetitions, wherein the phase coherence configuration can be determined based on the mapping scheme.

[0013] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the mapping scheme may be one of a round-robin mapping scheme, a sequential mapping scheme, or a half-and-half mapping scheme.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: determining that the UE will send a first group of repetitions and a second group of repetitions according to a cyclic mapping scheme, so that one or more of the first group of repetitions and one or more of the second group of repetitions will be sent in an alternating order, sending each demodulation reference signal transmission for the first group of repetitions without maintaining phase coherence according to a phase coherence configuration, and sending each demodulation reference signal transmission for the second group of repetitions without maintaining phase coherence according to the phase coherence configuration.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for maintaining a first phase coherence for demodulation reference signal transmissions corresponding to consecutive first repetitions of a first group of repetitions according to a phase coherence configuration and maintaining a second phase coherence for demodulation reference signal transmissions corresponding to consecutive second repetitions of a second group of repetitions according to the phase coherence configuration.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for maintaining a first phase coherence across demodulation reference signal transmissions of each consecutive group of first repetitions corresponding to the first group of repetitions according to a phase coherence configuration and maintaining a second phase coherence across demodulation reference signal transmissions of each consecutive group of second repetitions corresponding to the second group of repetitions according to the phase coherence configuration.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving one or more control messages may include operations, features, components, or instructions for receiving a control message that specifies that the UE is to use a sequential mapping scheme such that two first repetitions of a first group of repetitions can be sent consecutively and two second repetitions of a second group of repetitions can be sent consecutively.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving one or more control messages may include operations, features, components, or instructions for receiving a control message that specifies that the UE will use a half-and-half mapping such that a first set of repetitions will be sent continuously and a second set of repetitions will be sent continuously.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving one or more control messages may include operations, features, components, or instructions for receiving a control message indicating that the UE will be able to send a first group of repetitions using a first set of transmission parameters and will be able to send a second group of repetitions using a second set of transmission parameters, wherein the first group of repetitions and a corresponding first group of demodulation reference signals may be sent according to the first set of transmission parameters and the second group of repetitions and a corresponding second group of demodulation reference signals may be sent according to the second set of transmission parameters.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first set of transmission parameters and a second set of transmission parameters include one or more uplink beams, at least one uplink power control parameter, and precoding, and at least one value of the second set of transmission parameters may be different from a corresponding value of the first set of transmission parameters.

[0021] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a control message indicating that the UE will be able to use frequency hopping so that the UE will be able to send the first set of repetitions at a first frequency and send the second set of repetitions at a second frequency, wherein the phase coherence configuration may be determined at least in part based on the indication that the UE will be able to use the frequency hopping.

[0022] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that a UE will be able to send a first set of repetitions at a first frequency and a second set of repetitions at a second frequency, maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions at the first frequency according to a phase coherence configuration, and maintaining a second phase coherence for each demodulation reference signal transmission corresponding to the second set of repetitions at the second frequency according to the phase coherence configuration.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: determining that the UE will be able to send a first group of repetitions at a first frequency and a second group of repetitions at a second frequency, sending each demodulation reference signal transmission corresponding to the first group of repetitions at the first frequency without maintaining phase coherence based on the phase coherence configuration; and sending each demodulation reference signal transmission corresponding to the second group of repetitions at the second frequency without maintaining phase coherence based on the phase coherence configuration.

[0024] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that a UE will be able to send a first set of repetitions at a first frequency and a second set of repetitions at a second frequency, maintaining a first phase coherence for demodulation reference signal transmissions corresponding to consecutive first repetitions of the first set of repetitions at the first frequency based on a phase coherence configuration; and maintaining a second phase coherence for demodulation reference signal transmissions corresponding to consecutive second repetitions of the second set of repetitions at the second frequency based on the phase coherence configuration.

[0025] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: maintaining the first phase coherence across each consecutive group of first repetitions of a demodulation reference signal transmission corresponding to the first group of repetitions at the first frequency in accordance with the phase coherence configuration; and maintaining the second phase coherence across each consecutive group of second repetitions of a demodulation reference signal transmission corresponding to the second group of repetitions at the second frequency in accordance with the phase coherence configuration.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving one or more control messages may include operations, features, components, or instructions for performing the following operations: receiving a scheduling indication of a first set of repetitions and a second set of repetitions for scheduling physical uplink shared channel transmissions, and the repetitions will be sent using a type A configuration or a type B configuration, wherein the type A configuration indicates that consecutive repetitions will be sent in consecutive time slots, and the type B configuration indicates that consecutive repetitions can be sent continuously across one or more time slots.

[0027] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving one or more control messages may include operations, features, components, or instructions for performing the following operations: receiving a scheduling indication of a first set of repetitions and a second set of repetitions for scheduling physical uplink control channel transmissions, and the repetitions will be sent using an inter-slot configuration or an intra-slot configuration, wherein the inter-slot configuration indicates that consecutive repetitions will be sent in consecutive time slots and the intra-slot configuration indicates that consecutive repetitions will be sent continuously across one or more time slots.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: sending, by the UE, an indication of the UE capability for supporting maintaining phase coherence across non-continuous repetitions, wherein the one or more control messages may be received based at least in part on the indication of the UE capability.

[0029] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: receiving a demodulation reference signal bundling configuration that can indicate that the UE will be able to maintain phase coherence for uplink communications, wherein the phase coherence configuration can be determined based on receiving the demodulation reference signal bundling configuration.

[0030] A method for wireless communication at a base station is described. The method may include sending one or more control messages to a UE, the one or more control messages scheduling a first group of repetitions of an uplink transmission and a second group of repetitions of the uplink transmission according to a repetition configuration, determining a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals by the UE, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions, and receiving one or both of the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of modulation reference signals according to the phase coherence configuration.

[0031] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to send one or more control messages to a UE, the one or more control messages scheduling a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions according to a repetition configuration, determining a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals by the UE, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions, and configuring one or both of the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0032] Another apparatus for wireless communication at a base station is described. The apparatus may include means for sending one or more control messages to a UE, the one or more control messages scheduling a first set of repetitions of uplink transmissions and a second set of repetitions of uplink transmissions according to a repetition configuration, means for determining a phase coherence configuration to be applied to transmissions of the first set of repetitions and corresponding first set of demodulation reference signals and transmissions of the second set of repetitions and corresponding second set of demodulation reference signals by the UE, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions, and means for scheduling one or both of the first set of repetitions and the first set of demodulation reference signals and the second set of repetitions and the second set of demodulation reference signals according to the phase coherence configuration.

[0033] 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 send one or more control messages to a UE, the one or more control messages scheduling a first set of repetitions of uplink transmissions and a second set of repetitions of uplink transmissions according to a repetition configuration, determining a phase coherence configuration to be applied to transmissions of the first set of repetitions and corresponding first set of demodulation reference signals by the UE, and transmissions of the second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions, and receiving one or both of the first set of repetitions and the first set of demodulation reference signals and the second set of repetitions and the second set of demodulation reference signals.

[0034] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for estimating a channel for uplink transmission by combining at least two received demodulation reference signals corresponding to a first set of repetitions or corresponding to a second set of repetitions based on a phase coherence configuration.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for combining at least two received demodulation reference signals corresponding to a first set of repetitive non-contiguous first transmissions or a second set of repetitive non-contiguous second transmissions.

[0036] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for combining at least two received demodulation reference signals corresponding to consecutive first transmissions of the first set of repetitions or consecutive second transmissions of the second set of repetitions.

[0037] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a control message that may indicate a mapping scheme that the UE may use to send one or more of the first set of repetitions and one or more of the second set of repetitions, wherein the phase coherence configuration may be determined based on the mapping scheme.

[0038] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the mapping scheme may be one of a round-robin mapping scheme, a sequential mapping scheme, or a half-and-half mapping scheme.

[0039] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending an indication to a UE that the UE may send a first set of repetitions using a first frequency and a second set of repetitions using a second frequency, wherein a phase coherence configuration may be determined based on sending the indication.

[0040] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: sending a scheduling indication of a first set of repetitions and a second set of repetitions for scheduling physical uplink shared channel transmissions to a UE, and the repetitions may be sent using a type A configuration or a type B configuration, wherein the type A configuration indicates that consecutive repetitions may be sent in consecutive time slots, and the type B configuration indicates that consecutive repetitions may be sent continuously across one or more time slots.

[0041] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: sending a scheduling indication of a first set of repetitions and a second set of repetitions for scheduling physical uplink control channel transmissions to a UE, and the repetitions will be sent using an inter-slot configuration or an intra-slot configuration, wherein the inter-slot configuration indicates that consecutive repetitions will be sent in consecutive time slots, and the intra-slot configuration indicates that consecutive repetitions will be sent continuously across one or more time slots.

[0042] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, from a UE, an indication of UE capabilities for supporting maintaining phase coherence across non-continuous repetitions, wherein the phase coherence configuration may be determined based on the UE capabilities.

[0043] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following operations: sending a demodulation reference signal bundling configuration to a UE that can indicate that the UE will maintain phase coherence for uplink communications, wherein the phase coherence configuration can be determined based on sending the demodulation reference signal bundling configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 An example of a wireless communication system supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated.

[0045] Figure 2 An example of a wireless communication system supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated.

[0046] Figure 3 An example of a repetition mapping pattern that supports reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated.

[0047] Figure 4 An example frequency hopping repetition mapping pattern that supports reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated.

[0048] Figure 5 An example of a process flow diagram illustrating reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated.

[0049] Figure 6 and Figure 7 A block diagram of an apparatus supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown.

[0050] Figure 8 A block diagram of a communications manager supporting reference signal bundling for uplink channel repetition is shown in accordance with aspects of the present disclosure.

[0051] Fig. 9 A schematic diagram of a system including an apparatus supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown.

[0052] Fig.10 and Fig.11 A block diagram of an apparatus supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown.

[0053] Fig.12 A block diagram of a communications manager supporting reference signal bundling for uplink channel repetition is shown in accordance with aspects of the present disclosure.

[0054] Fig.13 A schematic diagram of a system including an apparatus supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown.

[0055] Figures 14 to 17 A flow chart illustrating a method of supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0056] A wireless communication system may support bundling of reference signals such as a demodulation reference signal (DMRS) to support improved channel estimation and communication performance. When two or more reference signals are bundled, the reference signals may be transmitted so that phase coherence is maintained for each reference signal transmission. Maintaining phase coherence may support receiving devices combining signals. In the case of DMRS bundling, a receiving device (e.g., a base station) may be able to jointly or coherently estimate a channel based on the combined signal.

[0057] The wireless communication system can also support channel repetition of various channels to improve communication reliability, as well as other benefits. For example, a user equipment (UE) can be configured to repeat uplink data or control channel transmission to increase the possibility of successful reception at a base station. Various repetition configurations can be supported for various channels. In some cases, channel repetition can be configured into two different sets, each of which will be sent according to a corresponding set of transmission parameters. In some cases, the transmission parameters correspond to a transmit beam, so each group of repetitions can be sent using a different transmit beam. Using different transmit beams can support the increased possibility of receiving and decoding channels at a receiving device (such as a base station) with multiple transmit-receive points (TRPs). In other cases, each group of repetitions can be associated with different hopping frequencies from a frequency hopping pattern.

[0058] The techniques described herein support DMRS bundling configuration for uplink channel repetitions. If a UE is scheduled or configured to perform two sets of uplink channel repetitions, such as physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) repetitions, the UE may determine a phase coherence configuration to be applied to the DMRS corresponding to the uplink channel repetitions. The UE may determine to maintain phase coherence for each set of repetitions such that the DMRS transmissions corresponding to each respective group may be combined at the base station for channel estimation. If the UE is unable to maintain phase coherence for non-continuous repetitions (e.g., the UE does not have the capability), the UE may determine to maintain phase coherence for consecutive groups of repetitions for each group if the pattern or mapping supports consecutive repetitions within a group.

[0059] These techniques may apply to various repetition configurations of PUSCH or PUCCH repetitions. In the case of PUSCH repetitions, these techniques may apply to type A repetitions (repetitions in different slots) or type B repetitions (continuous repetitions in one or more slots). In the case of PUCCH repetitions, these techniques may apply to inter-slot repetitions or intra-slot repetitions. A UE configured with frequency hopping for channel repetitions may perform similar techniques for DMRS bundling as described herein for changing transmission parameters.

[0060] Aspects of the present disclosure are initially described in the context of a wireless communication system. Aspects of the present disclosure are further described with respect to a wireless communication system, which shows schematic diagrams of channel repetition, repetition patterns, and process flow diagrams. Aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to reference signal bundling for uplink channel repetition.

[0061] Figure 1 An example of a wireless communication system 100 that supports reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0062] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may be devices of different forms or capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0063] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or both at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1Some 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, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0064] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other via the backhaul links 120 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0065] The one or more base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0066] 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 a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. 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, or a personal computer. In some examples, 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 communication (MTC) device, etc., which may be implemented in various objects, such as appliances, or vehicles, meters, etc.

[0067] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network devices including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, such as Figure 1 shown.

[0068] The UE 115 and the base station 105 can communicate with each other wirelessly via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel can carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 can use carrier aggregation or multi-carrier operation to support communication with the UE 115. According to the carrier aggregation configuration, the UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0069] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., the same or different radio access technology) is used to anchor the connection.

[0070] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0071] A carrier may be associated with a specific bandwidth of a radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of determined bandwidths of a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). The devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication over a specific carrier bandwidth or may be configured to support communication over one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each serviced UE 115 may be configured to operate on a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0072] The signal waveform transmitted through the carrier wave may be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may be composed of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are anti-correlated. 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). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate of the UE 115. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity of communications with the UE 115.

[0073] One or more numerologies of a carrier may be supported, where the numerologies may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP of a carrier may be active at a given time and communications for a UE 115 may be limited to the one or more activated BWPs.

[0074] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, which can be, for example, T s =1 / (Δf max ·N f ) seconds sampling period, where Δf maxIt can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources 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).

[0075] Each frame may include multiple consecutively numbered subframes or time slots, each of which may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, each of which may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple code element periods (e.g., depending on the length of the cyclic prefix attached to each code element period). In some wireless communication systems 100, a time slot may be further divided into multiple micro-time slots containing one or more code elements. In addition to the cyclic prefix, each code element period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0076] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication 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 communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0077] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a plurality of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more UEs 115 may monitor or search a control region to obtain control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with information encoded in a control information format having a given payload size. A search space set may include a common search space set configured for sending control information to a plurality of UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0078] Each base station 105 can provide communication coverage via one or more cells, such as macro cells, small cells, hot spots, or other types of cells or any combination thereof. The term "cell" can refer to a logical communication entity used to communicate with the base station 105 (e.g., via a carrier), and can be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish adjacent cells. In some examples, a cell can also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. These cells can range from smaller areas (e.g., structures, subsets of structures) to larger areas, depending on various factors such as the capabilities of the base station 105. For example, a cell can be or include a building, a subset of a building, or an external space between or overlapping geographic coverage areas 110, and the like.

[0079] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE 115 with a service subscription to a network provider supporting the macro cell. A small cell may be associated with a lower power base station 105 than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to a UE 115 with a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a home or office). A base station 105 may support one or more cells and may also support communications on one or more cells using one or more component carriers.

[0080] In some examples, a carrier can support multiple cells, and different cells can be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)), which can provide access to different types of devices.

[0081] In some examples, base stations 105 may be mobile and thus provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0082] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and in some examples, transmissions from different base stations 105 may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0083] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, 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.

[0084] Some UEs 115 may be configured to adopt an operating mode that reduces power consumption, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not participating in active communications, operating on a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0085] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication, and can be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include service prioritization, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency can be used interchangeably herein.

[0086] In some examples, UE 115 may also be able to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in the group may be outside the geographic coverage area 110 of the base station 105, or otherwise unable to receive transmissions from the base station 105. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates resource scheduling for D2D communication. In other cases, D2D communication is performed between UEs 115 without the involvement of the base station 105.

[0087] In some systems, the D2D communication link 135 can be an example of a communication channel between vehicles (e.g., UE 115), such as a sidelink communication channel. In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination thereof. The vehicle may send information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as a roadside unit), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0088] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity 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 an external network (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 UE 115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to IP services 150 of one or more network operators. The IP services 150 may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0089] Some network devices, such as base stations 105, may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0090] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate structures enough for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than transmissions using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0091] The wireless communication system 100 may also operate in a super high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also known as a centimeter wave band), or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also known as a millimeter wave band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The technology disclosed herein may be used across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory agency.

[0092] The wireless communication system 100 can use licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio spectrum band, devices such as base stations 105 and UEs 115 can employ carrier sensing for conflict detection and avoidance. In some examples, operations in an unlicensed band can be based on a carrier aggregation configuration in combination with a component carrier (e.g., LAA) operating in a licensed band. Operations in an unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0093] The base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located in different geographical locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports, which the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0094] The base station 105 or UE 115 can use MIMO communication to exploit multipath signal propagation and increase spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technology may be referred to as spatial multiplexing. Multiple signals may be sent, for example, by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are sent to multiple devices.

[0095] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or manipulate antenna beams (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience constructive interference and other signals experience destructive interference. Adjustment of signals transmitted via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. The adjustment associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., with respect to an antenna array of a transmitting device or a receiving device, or with respect to some other direction).

[0096] The base station 105 or the UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send signals based on different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as the base station 105, or by a receiving device such as the UE 115) a beam direction for later transmission or reception by the base station 105.

[0097] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0098] In some examples, transmissions by a device (e.g., base station 105 or UE 115) may be performed using multiple beam directions, and the device may generate a combined beam for transmission (e.g., from base station 105 to UE 115) using a combination of digital precoding or radio frequency beamforming. UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more subbands. Base station 105 may send reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)), which may be precoded or unprecoded. UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques to send signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to send signals in a single direction (e.g., to send data to a receiving device).

[0099] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a base station 105. For example, a receiving device may try multiple reception directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different reception 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 reception 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 reception configurations or reception directions. In some examples, a receiving device may receive along a single beam direction using a single reception configuration (e.g., when receiving a data signal). A single reception configuration may be aligned on a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0100] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication of the bearer layer or the packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate through logical channels. The medium access control (MAC) layer can perform priority processing and multiplexing of logical channels to transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the UE115 and the base station 105 or the core network 130 that supports the radio bearer of the user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0101] UE 115 and base station 105 can support retransmission of data to increase the possibility of successfully receiving data. Hybrid automatic repeat request (HARQ) feedback is a technology for increasing the possibility of correctly receiving data through communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC) and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput of the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device can support simultaneous slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in a previous codeword in the time slot. In other cases, the device can provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0102] The wireless communication system 100 can support the bundling of reference signals by UE 115 and / or base station 105 to support improved channel estimation and communication performance. When two or more reference signals are bundled, the reference signal can be sent by base station 105 or UE115 so that phase coherence is maintained for each reference signal transmission. Due to phase coherence, a receiving device (e.g., base station 105 or UE 115) receiving the bundled reference signal can be able to combine signals, which can support joint / coherent channel estimation. The wireless communication system 100 can also support channel transmission repetition to improve communication reliability. For example, UE 115 can be configured to repeat PUSCH or PUCCH transmissions so that base station 105 is more likely to receive / decode the transmission. In some cases, channel repetition can be configured as two or more groups, each of which will be sent according to a corresponding set of transmission parameters. For example, each group can be sent using different beams to increase the possibility of successful reception and decoding at a base station 105 configured with multiple antenna panels or TRPs.

[0103] According to the technology described herein, DMRS bundling can be configured for channel repetition with one or more groups. For example, if UE 115 is scheduled for two groups of uplink channel repetitions (e.g., PUSCH or PUCCH repetitions), UE 115 can also be configured to bundle DMRS transmissions. In such a case, UE 115 can determine to maintain phase coherence for each DMRS transmission of the corresponding group. In this way, the base station 105 receiving the bundled DMRS corresponding to one or both of them can jointly estimate the channel. However, in some examples, UE 115 may not be able to maintain phase coherence on non-continuous or non-adjacent transmissions. In such a case, UE 115 can determine to maintain phase coherence for adjacent or continuous repetitions in the group, provided that the repetition pattern supports adjacent or continuous repetitions. If the repetition mapping is sequential, this means that UE 115 will alternate between repetitions of each group, and UE 115 cannot maintain phase coherence for non-continuous repetitions, then UE 115 can send each DMRS without maintaining phase coherence.

[0104] As described in further detail herein, the DMRS bundling techniques may be applicable to various types of PUSCH or PUCCH repetitions performed by the UE 115. In the case of PUSCH repetitions, these techniques may be applicable to type A repetitions (repetitions in different time slots) or type B repetitions (continuous repetitions in one or more time slots). In the case of PUCCH repetitions, these techniques may similarly be applicable to inter-time slot repetitions or intra-time slot repetitions. In some cases, the base station 105 may configure the UE 115 to perform frequency hopping for channel repetitions, and the UE 115 may perform similar techniques for DMRS bundling.

[0105] Figure 2 An example of a wireless communication system 200 that supports reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated. The wireless communication system 200 may implement aspects of the wireless communication system 100 and include a base station 105-a and a UE 115-a, which may be related to Figure 1 Examples of corresponding devices described. Wireless communication system 200 can support DMRS bundling and uplink channel repetition as described herein. Figure 2 The bundled DMRS 225 is illustrated corresponding to a PUSCH 220 repetition, but it should be understood that similar techniques may be applicable to PUCCH repetitions, as described herein.

[0106] The wireless communication system 200 may support PUSCH or PUCCH DMRS bundling. When PUSCH or PUCCH DMRS 225 are bundled, the UE 115-a may maintain phase coherence for each DMRS transmission. The base station 105-a may receive the bundled DMRS and use one or more bundled DMRS to jointly / coherently estimate the channel, which may improve channel estimation performance. That is, the base station 105-a may combine the bundled DMRS 225 for channel estimation.

[0107] PUSCH phase discontinuity may occur based on different resource allocations for different PUSCH symbols, different transmit powers, different uplink beams (e.g., in FR2), and non-contiguous resource allocations. For example, if the timing gap between PUSCH symbols is greater than the threshold gap, other uplink channels or signals (e.g., PUCCH, sounding reference signal (SRS)) or downlink channels or signals (e.g., physical downlink control channel (PDCCH)), physical downlink shared channel (PDSCH), synchronization signal block (SSB), channel state information reference signal (CSI-RS)) may be transmitted during the gap, which may result in phase discontinuity.

[0108] The PUSCH 220 repetition can have two different configurations (e.g., indicated via the control message 205): Type A and Type B. For Type A repetition 220, in each time slot, the same codeword (e.g., the same starting codeword and the same length) can be used for PUSCH repetition 220. The number of repetitions K can be semi-statically configured (e.g., RRC messaging) or dynamically indicated in the time domain resource allocation (TDRA) field in the downlink control information. For RRC configuration, if UE 115-a is configured with a PUSCH-AggregationFactor parameter, the number of repetitions K can be equal to the PUSCH-AggregationFactor value. For dynamic indication, if the numberofrepetitions parameter exists in the TDRA table, the number of repetitions K can be equal to the numberofrepetitions indicated by the DCI (pointing to the TDRA row). As Figure 1 As shown, the type A repetitions include repetitions 230 - a , 230 - b , 230 - c , and 230 - d (eg, K=4 repetitions). Each repetition 230 may include a PUSCH 220 with a corresponding DMRS 225 .

[0109] Type B repetitions may include multiple "nominal" repetitions across one or more consecutive time slots. The number of nominal repetitions may be indicated in the downlink control information. For example, the number of repetitions may be configured for each row of the TDRA table and may be dynamically indicated by the downlink control information by pointing to the TDRA row. Each nominal repetition may have the same length. For example, in repetition configuration 235-a, each of the two repetitions (e.g., K=2) is four symbols. In some cases, the nominal repetition is divided into multiple actual repetitions due to the following reasons: (1) the repetition crosses the time slot boundary, or (2) one or more symbols of the nominal repetition are identified as invalid, wherein the nominal repetition is divided into multiple actual repetitions after deleting the invalid symbols. Each actual repetition may have an associated DMRS 225, and the DMRS position may be based on the actual repetition. For repetition configuration 235-b, there are four repetitions, each repetition is configured with four symbols. The nominal repetition 230-g falls on the time slot boundary and is therefore divided into two different actual repetitions. Each of the actual repetitions on either side of the time slot boundary may have a corresponding DMRS 225. For repetition configuration 235 - c , there is one nominal repetition 230 - h having fourteen symbols. The nominal repetition 230 - h crosses a slot boundary and is therefore split into two actual repetitions, each with a corresponding DMRS 225 .

[0110] If different PUSCH repetitions are intended to be received at different TRPs, panels, or antennas at the base station 105-a, using the same beam (or the same transmission parameters) may be inefficient. In some scenarios, in order to improve the reliability and robustness of PUSCH transmissions, PUSCH repetitions are configured into two groups, each of which will be sent according to a corresponding set of transmission parameters. In multi-TRP scenarios or other scenarios, different groups can improve diversity. For example, if one link is blocked, another repetition via another link may be decoded by a different TRP or antenna panel. Therefore, a set of transmission parameters may include uplink beams (e.g., spatial relationship information), power control parameters, precoder parameters (TPMI), etc. Therefore, two sets of repetitions can correspond to two different SRS resource sets. The downlink control information can indicate two beams, two sets of power control parameters, etc. by indicating one or more SRS resources within each of the two SRS resource sets.

[0111] To apply the parameter groups, one or more mapping modes may be configured via a control message 205 (e.g., RRC messaging). For example, the control message 205 may indicate that the UE 115-a is to use a cyclic mapping mode for two groups of repetitions. For the cyclic mapping mode, a first set and a second set of transmission parameters (e.g., a first beam and a second beam) are applied to the first PUSCH repetition and the second PUSCH repetition, respectively, and the pattern may be repeated for the remaining PUSCH repetitions. In another example, the control message 205 may indicate that the UE 115-a is to use a sequential mapping mode, which means that the first set of parameters (e.g., a first beam) are to be applied to the first PUSCH repetition and the second PUSCH repetition, and the second set of transmission parameters (e.g., a second beam) are to be applied to the third PUSCH repetition and the fourth PUSCH repetition. The pattern may continue for the remaining PUSCH repetitions. Another type of mapping mode may be a half-half mapping mode, where a first set of parameters (e.g., a first beam) is applied to the first half of the PUSCH repetition, and a second set of transmission parameters (e.g., a second beam) is applied to the second half of the PUSCH repetition. Figure 3 Further explanation and description.

[0112] These modes and configurations may similarly apply to PUCCH repetition. Up to two spatial relationship information configurations may be activated per PUCCH resource via MAC-CE (e.g., control message 205). PUCCH repetition may be configured into two groups such that each group is transmitted using a corresponding uplink beam (e.g., spatial relationship information) and power control parameters. The mapping modes described herein for PUSCH repetition may be applicable to PUCCH repetition. In addition, repetition for PUCCH may have one of two configurations: inter-slot repetition and intra-slot repetition. For inter-slot repetition, one PUCCH resource carries uplink control information, and the same PUCCH resource in one or more additional slots may carry repetitions of the uplink control information. For intra-slot repetition, one PUCCH resource may carry uplink control information, and the same PUCCH resource in one or more additional sub-slots within a slot may carry repetitions of the uplink control information.

[0113] According to the techniques described herein, if a UE 115-a is configured with PUSCH or PUCCH DMRS 225 bundling and receives a control message scheduling PUSCH / PUCCH repetitions with two sets of repetitions associated with two sets of transmission parameters, the DMRS 225 belonging to the same group are bundled (e.g., transmitted while maintaining phase coherence between transmissions). More specifically, phase coherence is maintained by the UE 115-a for the DMRS across repetitions associated with the same set of transmission parameters. In this way, a base station 105-a with one or more TRPs can perform joint / coherent channel estimation across repetitions belonging to the same group. The techniques are applicable to type A and type B PUSCH repetitions as well as inter-slot or intra-slot PUCCH repetitions.

[0114] In some examples, UE 115-a may not be able to maintain phase coherence across non-continuous repetitions. In such a case, DMRS bundling may further rely on the mapping pattern of the repetitions in the first group and the second group. For the cyclic mapping pattern, since there may not be consecutive repetitions of the same group, UE 115-a may not be able to bundle DMRS 225 transmissions. For the sequential mapping mode, DMRS 225 transmissions may be bundled across two consecutive repetitions belonging to the same group. For the half-and-half mapping mode, DMRS 225 transmissions may be bundled across each repetition belonging to the same group. When UE 115-a cannot support phase coherence across non-continuous repetitions of the same group, the technique may maximize the number of repetitions of the bundled DMRS 225 transmissions.

[0115] These techniques may similarly apply when UE 115-a is configured with a frequency hopping configuration for PUSCH or PUCCH repetitions. In such a case, UE 115-a may be configured to send a first set of repetitions at a first frequency and a second set of repetitions at a second frequency. If UE 115-a is able to maintain phase coherence in non-continuous repetitions of the same group, UE 115-a may maintain the corresponding phase coherence of DMRS 225 transmissions at each frequency. In some cases, UE 115-a is configured to alternate between frequencies in a cyclic pattern. In such a case, if UE 115-a is unable to maintain phase coherence for non-continuous repetitions in the same frequency, UE 115-a may send DMRS 225 without maintaining phase coherence (e.g., without bundling). In some cases, frequency hopping of UE 115-a may be configured in a sequential or half-and-half mode. In such a case, UE 115-a may maintain phase coherence for DMRS 225 transmissions corresponding to consecutive repetitions at the same frequency. Figure 4 Describe in more detail.

[0116] Figure 3 An example of a repetition mapping scheme 300 that supports reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated. The repetition mapping scheme 300 may be used by a UE 115 for PUSCH or PUCCH repetition, as described with respect to Figure 1 and Figure 2 as described herein. In some cases, one of the repetition mapping modes may be configured at UE 115 by base station 105 using control signaling such as RRC signaling. As described herein, UE 115 may also be configured to perform PUSCH or PUCCH bundling (e.g., via control signaling, such as RRC signaling). If UE 115 is configured for DMRS bundling and receives a control message scheduling two sets of repeated PUSCH or PUCCH repetitions associated with two sets of transmission parameters, DMRS belonging to the same group of PUSCH / PUCCH repetitions may be bundled. As described herein, the transmission parameters may include uplink beams, uplink transmission power (e.g., uplink power control parameters such as alpha, P0, PL-RS, closed loop index), precoding (e.g., TPMI for PUSCH).

[0117] If UE 115 is able to maintain phase coherence across non-continuous repetitions of the same group, UE 115 can maintain corresponding phase coherence for the corresponding group regardless of the repetition mapping scheme (also referred to herein as a mapping mode). For example, UE 115 can be configured to send repetitions according to a cyclic mapping scheme 305, a sequential mapping scheme 310, or a half-mapping scheme 315. It should be understood that other mapping schemes are contemplated within the scope of the present disclosure. Each mapping scheme shows a pattern of PUSCH or PUCCH repetitions from a first group associated with a first set of transmission parameters (e.g., repetition 320) and a second group associated with a second set of transmission parameters (e.g., repetition 325).

[0118] According to the cyclic mapping scheme 305, the UE 115 will alternate between the first repetition 320 and the second repetition 325. As described, if the UE 115 is able to maintain phase coherence across non-contiguous repetitions of the group, the UE 115 may maintain the first phase coherence for the DMRS transmission corresponding to each first repetition 320 of the first group in the cyclic mapping scheme 305. In addition, the UE 115-a may maintain a separate second phase coherence for the DMRS transmission corresponding to each second repetition 325 of the second group in the cyclic mapping scheme 305. That is, the DMRS corresponding to each repetition 320 is bundled, and the DMRS corresponding to each repetition 325 is bundled. If the UE 115 is not able to maintain phase coherence across non-contiguous repetitions, the UE 115 may not bundle the DMRS in the cyclic mapping scheme 305.

[0119] According to the sequential mapping scheme 310, the UE 115 will send two repetitions 320 corresponding to the first group, followed by two repetitions 325 of the second group, and repeat the pattern for the remaining repetitions. If the UE 115 is able to maintain phase coherence across non-continuous repetitions of the group, the UE 115 can maintain the first phase coherence for the DMRS transmission corresponding to each first repetition 320 of the first group in the sequential mapping scheme 310. In addition, the UE 115 can maintain a separate second phase coherence for the DMRS transmission corresponding to each second repetition 325 of the second group in the cyclic mapping scheme 305. That is, the DMRS corresponding to each repetition 320 is bundled, and the DMRS corresponding to each repetition 325 is bundled. If the UE 115 is unable to maintain phase coherence across non-continuous repetitions, the UE 115 can bundle the DMRS corresponding to the consecutive repetitions 330 in the same group. Therefore, the DMRS corresponding to the consecutive repetitions 330-a can be bundled, and the DMRS corresponding to the consecutive repetitions 330-b can be bundled. The remaining groups of DMRSs corresponding to the consecutive repetitions 330 of the sequential mapping scheme 310 may be similarly bundled. In some cases, the sequential mapping scheme 310 may include more than two consecutive repetitions of the same group, and DMRS bundling may similarly apply.

[0120] According to the half-mapping scheme 315, the UE 115 will transmit the first half repetition 320 corresponding to the first set of parameters and the second half repetition 325 corresponding to the second set of parameters. The UE 115 can maintain the first phase coherence for the DMRS transmission corresponding to each repetition 320 of the first set because each repetition is a consecutive repetition 330-c in the half-mapping scheme 315. In addition, the UE 115-b can maintain the second phase coherence for the DMRS transmission corresponding to each repetition 325 of the second set because each repetition is a consecutive repetition 330-d in the half-mapping scheme 315.

[0121] The base station 105 receiving the repetitions according to the corresponding mapping scheme may combine one or more DMRS of the same group, depending on the UE capabilities and configuration. For example, if the UE 115 is able to maintain phase coherence across non-continuous repetitions, the base station 105 may combine DMRS from the same repetition group for each mapping scheme. If the UE 115 is not able to maintain phase coherence for non-continuous repetitions, the base station 105 may not combine DMRS transmissions when using the cyclic mapping scheme 305. If the sequential mapping scheme 310 or the half-and-half mapping scheme 315 is used, the base station may combine DMRS from consecutive repetitions of the same group.

[0122] Figure 4An example of a frequency hopping repetition mapping scheme 400 that supports reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated. The frequency hopping repetition mapping scheme 400 may be used by a UE 115 for PUSCH or PUCCH repetition, as described with respect to FIG. Figure 1 and 2 For example, inter-repetition frequency hopping may be configured for PUSCH repetitions and PUCCH repetitions. In such a case, even-numbered repetitions may be sent using a first hopping frequency (e.g., at a first frequency), and odd-numbered repetitions may be sent using a second hopping frequency (e.g., at a second frequency). The hopping pattern may be similar to that described with respect to Figure 3 The cyclic mapping scheme 305 is depicted and shown as the cyclic mapping scheme 405. In some cases, when frequency hopping is configured or activated at the UE 115, the cyclic mapping scheme 405 may be the default mode.

[0123] According to the techniques described herein, if UE 115 is configured with PUSCH / PUCCH DMRS bundling and UE 115 receives a control message (e.g., RRC or DCI) scheduling PUSCH / PUCCH repetitions with frequency hopping enabled, UE 115 can bundle DMRS corresponding to PUSCH or PUCCH repetitions sent in the same frequency hopping. For example, UE 115 can bundle DMRS corresponding to each repetition 420 sent in a first frequency hopping, and separately bundle DMRS corresponding to each repetition 425 sent in a second frequency hopping. In this way, base station 105 can perform joint / coherent channel estimation using DMRS of the same frequency hopping. These techniques can be applied to type A PUSCH repetitions, type B PUSCH repetitions, inter-slot PUCCH repetitions, or intra-slot PUCCH repetitions.

[0124] In addition, for inter-repetition frequency hopping, the UE 115 can be configured with a mapping scheme of a cyclic mapping scheme 405, a sequential mapping scheme 410, or a half-and-half mapping scheme 415. It should be understood that other mapping schemes are contemplated within the scope of the present disclosure. For the cyclic mapping scheme 405, the first repetition 420 and the second repetition 425 are sent using the first frequency and the second frequency, respectively, and the same frequency hopping mapping pattern can continue for the remaining repetitions. If the UE 115 is capable, the UE 115 can maintain a first phase coherence for the DMRS corresponding to each repetition 420 and a second phase coherence for the DMRS corresponding to each repetition 425 in the cyclic mapping scheme 405.

[0125] The UE 115 may be configured with a sequential mapping scheme 410 for frequency hopping using PUSCH or PUCCH repetitions. According to the sequential mapping scheme 410 for frequency hopping, two first repetitions 420 and two second repetitions 425 will be sent using first and second frequency hopping, respectively, and the same frequency hopping mapping pattern may continue for the remaining repetitions. If the UE 115 is capable, the UE 115 may maintain a first phase coherence for a DMRS corresponding to each repetition 420 and a second phase coherence for a DMRS corresponding to each repetition 425 in the sequential mapping scheme 410.

[0126] The UE 115 may also be configured with a split-half mapping scheme 415 for frequency hopping using PUSCH or PUCCH repetitions. According to the split-half mapping scheme 415 for frequency hopping, the first half of the repetition 420 will be sent using a first hopping frequency, and the second half of the repetition 425 will be sent using a second hopping frequency. In the split-half mapping scheme 415, the UE 115 may maintain a first phase coherence for the DMRS corresponding to each repetition 420 and a second phase coherence for the DMRS corresponding to each repetition 425.

[0127] If the UE 115 is not able to maintain phase coherence across non-continuous repetitions, DMRS bundling is further conditioned on a mapping scheme, which may be similar to the transmission parameter configuration scheme, such as with respect to Figure 3 As described. For the cyclic mapping scheme 405, UE115 may not perform DMRS bundling. For the sequential mapping scheme, the DMRS may be bundled across two consecutive repetitions that are transmitted using the same hopping frequency. For example, the DMRS corresponding to the consecutive repetition 430-a may be bundled, and the DMRS corresponding to the consecutive repetition 430-b may be bundled. The DMRS of the consecutive repetition 430 corresponding to the same hopping frequency of the remaining repetitions may be similarly bundled.

[0128] For the half-mapping scheme 415, the DMRS can be bundled across repetitions using the same hopping frequency. This scheme can maximize the use of the repetitions of the bundled DMRS. In this way, the DMRS corresponding to the consecutive repetitions 430-c can be bundled, and the DMRS corresponding to the consecutive repetitions 430-d can be bundled. The receiving base station 105 can combine the bundled DMRS sent with the same hopping frequency to support joint / coherent channel estimation.

[0129] Figure 5 An example of a process flow diagram 500 illustrating reference signal bundling for uplink channel repetition according to aspects of the present disclosure is illustrated. The process flow diagram 500 includes a UE 115-b and a base station 105-b, which may be related to Figure 1 and Figure 2Examples of corresponding devices described. UE 115-b and base station 105-b can support DMRS bundling and uplink channel repetition as described herein.

[0130] At 505, UE 115-a may receive a DMRS bundling configuration from base station 105-b indicating that the UE is to maintain phase coherence for uplink communications. The bundling configuration may be received in a control message such as an RRC message, a DCI message, or a MAC-CE message.

[0131] At 510, UE 115-a may receive one or more control messages that schedule a first set of repetitions for uplink transmissions and a second set of repetitions for uplink transmissions. One or more control messages may schedule PUSCH repetition type A, PUSCH repetition type B, inter-slot PUCCH repetition, intra-slot PUCCH repetition, or a combination thereof. The number of repetitions K may be semi-statically configured via RRC messaging or dynamically indicated via DCI (e.g., via the TDRA field). The nominal number of repetitions (e.g., for type BPUSCH repetitions) may be indicated via DCI, and the actual number of repetitions may be determined by UE 115-b. In some examples, one or more control messages may indicate two sets of transmission parameters corresponding to a repetition group. In some cases, one or more control messages may activate frequency hopping for a repetition group. One or more control messages may also indicate a mapping scheme that UE 115-a will use for a repetition group, such as a cyclic mapping scheme, a sequential mapping scheme, or a half-mapping scheme. In some examples, the mapping scheme may be a scheme for frequency hopping.

[0132] At 515, UE 115-b may determine a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals. The phase coherence configuration may be determined at least in part based on the phase coherence capability of the UE, and may specify that phase coherence is to be maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. UE 115-a may determine to maintain a first phase coherence across DMRS transmissions for each repetition of the first group, and to maintain a second phase coherence across DMRS transmissions separately for each repetition of the second group. This determination may be based on the UE 115-b being able to maintain phase coherence across non-continuous repetitions. In some examples, UE 115-b is unable to maintain phase coherence across non-continuous repetitions. In such a case, the phase coherence configuration may be based on a repetition pattern or scheme indicated by one or more control messages. For a cyclic mapping scheme (frequency hopping or repetition corresponding to a corresponding group of transmission patterns), UE 115-b may determine not to maintain phase coherence. For a sequential mapping scheme or a split-half mapping scheme, the UE 115-b may determine that phase coherence is maintained for consecutively repeated DMRSs corresponding to the same group or frequency hopping.

[0133] At 520, UE 115-b may transmit a first set of repetitions and a first set of DMRS, and at 525, UE 115-b may transmit a second set of repetitions and a second set of DMRS. The first and second sets of repetitions and corresponding DMRS may be transmitted according to the determined phase coherence configuration.

[0134] At 525, the base station 105-b may estimate a channel for uplink transmission by combining at least two received DMRSs corresponding to the first set of repetitions or corresponding to the second set of repetitions according to the phase coherence configuration.

[0135] In some examples, UE 115-b can indicate to base station 105-b whether UE 115-b is capable of supporting maintaining phase coherence for non-continuous repetitions. In such a case, base station 105-b can configure the repetition scheme based on the capabilities of UE 115-b. In other examples, base station 105-b can determine when UE 115-b is capable of bundling DMRS based on the configured mapping scheme and UE capabilities. Therefore, base station 105-b can determine when it can use bundled DMRS for channel estimation.

[0136] Figure 6A block diagram 600 of a device 605 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. 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 transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0137] Receiver 610 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. The information may be communicated to other components of device 605. Receiver 610 may utilize a single antenna or a set of multiple antennas.

[0138] The transmitter 615 may provide means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels associated with reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. In some examples, the transmitter 615 may be co-located with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.

[0139] The communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of reference signal bundling for uplink channel repetition as described herein. For example, the communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof, or components thereof, may support methods for performing one or more functions described herein.

[0140] In some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof can be implemented in hardware (e.g., in a communication management circuit). The hardware can include a processor, a 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 that is configured as or otherwise supports components for performing the functions described in the present disclosure. In some examples, a processor and a memory coupled to the processor can be configured to perform one or more functions described herein (e.g., by executing instructions stored in the memory by the processor).

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

[0142] In some examples, communication manager 620 can be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with receiver 610, transmitter 615, or both. For example, communication manager 620 can receive information from receiver 610, send information to transmitter 615, or be integrated in conjunction with receiver 610, transmitter 615, or both to receive information, send information, or perform various other operations as described herein.

[0143] According to the examples disclosed herein, the communication manager 620 can support wireless communications at the UE. For example, the communication manager 620 can be configured to or otherwise support a component for receiving a first group of repetitions for scheduling uplink transmissions and a second group of repetitions for uplink transmissions. The communication manager 620 can be configured to or otherwise support a component for determining a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The communication manager 620 can be configured to or otherwise support a component for sending the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0144] By including or configuring the communication manager 620 according to the examples described herein, the device 605 (e.g., a processor controlling or otherwise coupled to the receiver 610, the transmitter 615, the communication manager 620, or a combination thereof) can support techniques for more efficient use of communication resources. By determining a phase coherence configuration for the first and second groups of uplink repetitions, the device 605 can send DMRS corresponding to the uplink transmissions so that the DMRS can be combined for channel estimation. The techniques can support reduced processing (e.g., by maintaining phase coherence where possible) and efficient communication of various devices.

[0145] Figure 7 A block diagram 700 of a device 705 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0146] The receiver 710 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. The information may be communicated to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.

[0147] The transmitter 715 may provide means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels associated with reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. In some examples, the transmitter 715 may be collocated with the receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.

[0148] The device 705 or its various components may be examples of components for performing various aspects of reference signal bundling for uplink channel repetition as described herein. For example, the communication manager 720 may include a control message interface 725, a phase coherence configuration component 730, a repetition interface 735, or any combination thereof. The communication manager 720 may be an example of aspects of the communication manager 620 as described herein. In some examples, the communication manager 720 or its various components may be configured to perform various operations (e.g., receive, monitor, transmit) using the receiver 710, the transmitter 715, or both or otherwise in cooperation with the receiver 710, the transmitter 715, or both. For example, the communication manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated with the receiver 710, the transmitter 715, or both to receive information, send information, or perform various other operations as described herein.

[0149] According to the examples disclosed herein, the communication manager 720 can support wireless communications at the UE. The control message interface 725 can be configured to or otherwise support components for receiving a first group of repetitions for scheduling uplink transmissions and a second group of repetitions for uplink transmissions. The phase coherence configuration component 730 can be configured to or otherwise support components for determining a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The repetition interface 735 can be configured to or otherwise support components for sending the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0150] Figure 8 A block diagram 800 of a communication manager 820 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The communication manager 820 can be an example of aspects of the communication manager 620, the communication manager 720, or both as described herein. The communication manager 820 or its various components can be examples of components for performing various aspects of reference signal bundling for uplink channel repetition as described herein. For example, the communication manager 820 can include a control message interface 825, a phase coherence configuration component 830, a repetition interface 835, a DMRS transmission component 840, a repetition configuration component 845, a frequency hopping configuration component 850, a scheduling component 855, a capability component 860, a DMRS bundling configuration component 865, or any combination thereof. Each of these components can communicate with each other directly or indirectly (e.g., via one or more buses).

[0151] According to the examples disclosed herein, the communication manager 820 can support wireless communication at the UE. The control message interface 825 can be configured to or otherwise support a component for receiving a first group of repetitions for scheduling uplink transmissions and a second group of repetitions for uplink transmissions. The phase coherence configuration component 830 can be configured to or otherwise support a component for determining a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The repetition interface 835 can be configured to or otherwise support a component for sending the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0152] In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions according to the phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a second phase coherence for each demodulation reference signal transmission corresponding to the second set of repetitions according to the phase coherence configuration.

[0153] In some examples, the control message interface 825 can be configured to or otherwise support components for receiving a control message indicating a mapping scheme that the UE will use to send one or more repetitions in a first group of repetitions and one or more of a second group of repetitions, wherein the phase coherence configuration is determined based on the mapping scheme.

[0154] In some examples, the mapping scheme is one of a round-robin mapping scheme, a sequential mapping scheme, or a half-and-half mapping scheme.

[0155] In some examples, the repetition configuration component 845 can be configured to or otherwise support components for performing the following operations: determining that the UE will send a first set of repetitions and a second set of repetitions according to a cyclic mapping scheme, so that one or more of the first set of repetitions and one or more of the second set of repetitions will be sent in an alternating order. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for sending each demodulation reference signal transmission for the first set of repetitions without maintaining phase coherence according to a phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for sending each demodulation reference signal transmission for the second set of repetitions without maintaining the phase coherence according to a phase coherence configuration.

[0156] In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a first phase coherence for a demodulation reference signal transmission corresponding to consecutive first repetitions of the first group of repetitions according to the phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a second phase coherence for a demodulation reference signal transmission corresponding to consecutive second repetitions of the second group of repetitions according to the phase coherence configuration.

[0157] In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a first phase coherence across each consecutive group of demodulation reference signal transmissions corresponding to a first group of repetitions according to the phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a second phase coherence across each consecutive group of demodulation reference signal transmissions corresponding to a second group of repetitions according to the phase coherence configuration.

[0158] In some examples, to support receiving one or more control messages, the control message interface 825 may be configured as or otherwise support components for performing the following operations: receiving a control message that specifies that the UE will use a sequential mapping scheme such that two first repetitions in a first group of repetitions will be sent consecutively and two second repetitions in a second group of repetitions will be sent consecutively.

[0159] In some examples, to support receiving one or more control messages, the control message interface 825 may be configured as or otherwise support components for receiving a control message specifying that the UE will use a half-and-half mapping such that a first set of repetitions will be sent continuously and a second set of repetitions will be sent continuously.

[0160] In some examples, to support receiving one or more control messages, the control message interface 825 may be configured as or otherwise support components for performing the following operations: receiving a control message indicating that the UE will use a first set of transmission parameters to send a first set of repetitions and use a second set of transmission parameters to send a second set of repetitions, wherein the first set of repetitions and the corresponding first set of demodulation reference signals are sent according to the first set of transmission parameters and the second set of repetitions and the corresponding second set of demodulation reference signals are sent according to the second set of transmission parameters.

[0161] In some examples, the first set of transmission parameters and the second set of transmission parameters include one or more uplink beams, at least one uplink power control parameter, and precoding. In some examples, at least one value of the second set of transmission parameters is different from the corresponding value of the first set of transmission parameters.

[0162] In some examples, the control message interface 825 can be configured as or otherwise support components for performing the following operations, receiving a control message indicating that the UE will use frequency hopping so that the UE will send a first set of repetitions at a first frequency and a second set of repetitions at a second frequency, wherein the phase coherence configuration is determined based on the indication that the UE will use frequency hopping.

[0163] In some examples, the frequency hopping configuration component 850 can be configured to or otherwise support components for determining that the UE will transmit a first set of repetitions at a first frequency and a second set of repetitions at a second frequency. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions at the first frequency according to the phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for maintaining a second phase coherence for each demodulation reference signal transmission corresponding to the second set of repetitions at the second frequency according to the phase coherence configuration.

[0164] In some examples, the phase coherence configuration component 830 can be configured to or otherwise support components for determining that the UE will send a first set of repetitions at a first frequency and send a second set of repetitions at a second frequency. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for sending each demodulation reference signal transmission corresponding to the first set of repetitions at the first frequency without maintaining phase coherence according to the phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for sending each demodulation reference signal transmission corresponding to the second set of repetitions at the second frequency without maintaining phase coherence according to the phase coherence configuration.

[0165] In some examples, the frequency hopping configuration component 850 can be configured to or otherwise support components for determining that the UE will transmit a first set of repetitions at a first frequency and a second set of repetitions at a second frequency. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for maintaining a first phase coherence for demodulation reference signal transmissions corresponding to consecutive first repetitions of the first set of repetitions at the first frequency according to the phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured to or otherwise support components for maintaining a second phase coherence for demodulation reference signal transmissions corresponding to consecutive second repetitions of the second set of repetitions at the second frequency according to the phase coherence configuration.

[0166] In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a first phase coherence across each consecutive group of demodulation reference signal transmissions and corresponding to a first repetition in a first set of repetitions at a first frequency in accordance with a phase coherence configuration. In some examples, the DMRS transmission component 840 can be configured or otherwise support components for maintaining a second phase coherence across each consecutive group of second repetitions in a second set of repetitions at a second frequency in accordance with a phase coherence configuration.

[0167] In some examples, to support receiving one or more control messages, the scheduling component 855 can be configured as or otherwise support components for performing the following operations: receiving a scheduling indication of a first set of repetitions and a second set of repetitions for scheduling physical uplink shared channel transmissions, and the repetitions will be sent using a type A configuration or a type B configuration, where the type A configuration indicates that consecutive repetitions will be sent in consecutive time slots and the type B configuration indicates that consecutive repetitions are sent continuously across one or more time slots.

[0168] In some examples, to support receiving one or more control messages, the scheduling component 855 can be configured as or otherwise support components for receiving a scheduling indication for a first set of repetitions and a second set of repetitions for scheduling physical uplink control channel transmissions, and repetitioning the transmissions using an inter-slot configuration or an intra-slot configuration, wherein the inter-slot configuration indicates that consecutive repetitions are to be transmitted in consecutive time slots, and the intra-slot configuration indicates that consecutive repetitions are to be transmitted consecutively across one or more time slots.

[0169] In some examples, capability component 860 can be configured to or otherwise support components for performing the following operations: sending, by the UE, an indication of UE capabilities for supporting maintaining phase coherence across non-continuous repetitions, wherein the one or more control messages are received based at least in part on the indication of the UE capabilities.

[0170] In some examples, the DMRS bundling configuration component 865 can be configured as or otherwise support components for performing the following operations: receiving a demodulation reference signal bundling configuration indicating that the UE will maintain phase coherence for uplink communications, wherein the phase coherence configuration is determined at least in part based on receiving the demodulation reference signal bundling configuration.

[0171] Fig. 9A schematic diagram of a system 900 including a device 905 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The device 905 may be an example of a device 605, a device 705, or a UE 115 as described herein or include a component of a device 605, a device 705, or a UE 115 as described herein. The device 905 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, a code 935, and a processor 940. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 945).

[0172] I / O controller 910 can manage input and output signals for device 905. I / O controller 910 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 910 can represent a physical connection or port to an external device. In some cases, I / O controller 910 can utilize a variety of communication protocols such as TCP, HTTP, and HTTPS. Or other known operating systems. Additionally or alternatively, I / O controller 910 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 910 may be implemented as part of a processor, such as processor 940. In some cases, a user may interact with device 905 via I / O controller 910 or via hardware components controlled by I / O controller 910.

[0173] In some cases, the device 905 may include a single antenna 925. However, in some other cases, the device 905 may have more than one antenna 925, which may be able to send or receive multiple wireless transmissions simultaneously. The transceiver 915 may communicate bidirectionally via one or more antennas 925, a wired or wireless link, as described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 915 may also include a modem to modulate packets, provide the modulated packets to one or more antennas 925 for transmission, and demodulate packets received from one or more antennas 925. The transceiver 915, or the transceiver 915 and one or more antennas 925, may be an example of a transmitter 615, a transmitter 715, a receiver 610, a receiver 710, or any combination thereof, or components thereof, as described herein.

[0174] 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 by the processor 940, cause the device 905 to perform various functions described herein. The code 935 may be stored in a non-temporary computer-readable medium, such as a system memory or another type of memory. In some cases, the code 935 may not be directly executable by the processor 940, but may cause the computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, the memory 930 may include a basic I / O system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0175] 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 some other cases, the 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., a memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks that support reference signal bundling for uplink channel repetition). For example, the device 905 or a component of the device 905 may include a processor 940 and a memory 930 coupled to the processor 940, and the processor 940 and the memory 930 are configured to perform the various functions described herein.

[0176] According to the examples disclosed herein, the communication manager 920 can support wireless communications at the UE. For example, the communication manager 920 can be configured to or otherwise support a component for receiving a first group of repetitions for scheduling uplink transmissions and a second group of repetitions for uplink transmissions. The communication manager 920 can be configured to or otherwise support a component for determining a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The communication manager 920 can be configured to or otherwise support a component for sending the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0177] By including or configuring the communication manager 920 according to the examples described herein, the device 905 can support techniques for more efficiently utilizing communication resources. By determining a phase coherence configuration for the first and second groups of uplink repetitions, the device 605 can send DMRS corresponding to the uplink transmission so that the DMRS can be combined for channel estimation. The technique can support reduced processing at the processor 940 (e.g., by maintaining phase coherence when possible) and efficient communication of various devices.

[0178] In some examples, the communication manager 920 can be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 915, one or more antennas 925, or any combination thereof. Although the communication manager 920 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 920 may be supported or performed by the processor 940, the memory 930, the code 935, or any combination thereof. For example, the code 935 may include instructions executable by the processor 940 to cause the device 905 to perform various aspects of reference signal bundling for uplink channel repetition as described herein, or the processor 940 and the memory 930 may be otherwise configured to perform or support such operations.

[0179] Fig.10 A block diagram 1000 of a device 1005 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The device 1005 can be an example of aspects of a base station 105 as described herein. The device 1005 can include a receiver 1010, a transmitter 1015, and a communication manager 1020. The device 1005 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0180] Receiver 1010 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. The information may be communicated to other components of device 1005. Receiver 1010 may utilize a single antenna or a set of multiple antennas.

[0181] The transmitter 1015 may provide means for transmitting signals generated by other components of the device 1005. For example, the transmitter 1015 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels associated with reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. In some examples, the transmitter 1015 may be collocated with the receiver 1010 in a transceiver module. The transmitter 1015 may utilize a single antenna or a set of multiple antennas.

[0182] The communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of reference signal bundling for uplink channel repetition as described herein. For example, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations thereof, or components thereof, may support methods for performing one or more functions described herein.

[0183] In some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof can be implemented in hardware (e.g., in a communication management circuit). The hardware can include a processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting components for performing the functions described in this disclosure. In some examples, a processor and a memory coupled to the processor can be configured to perform one or more functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0184] Additionally or alternatively, in some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functions of the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be performed by a general purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting components for performing the functions described in the present disclosure).

[0185] In some examples, communication manager 1020 can be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with receiver 1010, transmitter 1015, or both. For example, communication manager 1020 can receive information from receiver 1010, send information to transmitter 1015, or be integrated with receiver 1010, transmitter 1015, or both to receive information, send information, or perform various other operations as described herein.

[0186] According to the examples disclosed herein, the communication manager 1020 can support wireless communications at a base station. For example, the communication manager 1020 can be configured to or otherwise support a component for sending one or more control messages to a UE, the one or more control messages scheduling a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions according to a repetition configuration. The communication manager 1020 can be configured to or otherwise support a component for determining a phase coherence configuration to be applied by the UE to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The communication manager 1020 can be configured to or otherwise support a component for receiving one or both of the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0187] By including or configuring the communication manager 1020 according to the examples described herein, the device 1005 (e.g., a processor controlling or otherwise coupled to the receiver 1010, the transmitter 1015, the communication manager 1020, or a combination thereof) can support techniques for more efficient use of communication resources. By determining a phase coherence configuration for a first and second set of uplink repetitions, the device 1005 can receive DMRS corresponding to uplink transmissions so that the DMRS can be combined for channel estimation. The technique can support reduced processing and efficient communication of various devices by combining bundled DMRS (e.g., the device 1005 can efficiently estimate a channel using the bundled DMRS).

[0188] Fig.11A block diagram 1100 of a device 1105 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or base station 105 as described herein. The device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0189] The receiver 1110 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. The information may be communicated to other components of the device 1105. The receiver 1110 may utilize a single antenna or a set of multiple antennas.

[0190] The transmitter 1115 may provide means for transmitting signals generated by other components of the device 1105. For example, the transmitter 1115 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels associated with reference signal bundling for uplink channel repetition), user data, control information, or any combination thereof. In some examples, the transmitter 1115 may be collocated with the receiver 1110 in a transceiver module. The transmitter 1115 may utilize a single antenna or a set of multiple antennas.

[0191] The device 1105 or its various components may be examples of components for performing various aspects of reference signal bundling for uplink channel repetition as described herein. For example, the communication manager 1120 may include a control message interface 1125, a phase coherence configuration component 1130, a communication interface 1135, or any combination thereof. The communication manager 1120 may be an example of aspects of the communication manager 1020 as described herein. In some examples, the communication manager 1120 or its various components may be configured to perform various operations (e.g., receive, monitor, transmit) using the receiver 1110, the transmitter 1115, or both or otherwise cooperate with the receiver 1110, the transmitter 1115, or both. For example, the communication manager 1120 may receive information from the receiver 1110, send information to the transmitter 1115, or be integrated with the receiver 1110, the transmitter 1115, or both to receive information, send information, or perform various other operations as described herein.

[0192] According to the examples disclosed herein, the communication manager 1120 can support wireless communication at the base station. The control message interface 1125 can be configured to or otherwise support a component for sending one or more control messages to the UE, the one or more control messages scheduling a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions according to a repetition configuration. The phase coherence configuration component 1130 can be configured to or otherwise support a component for determining a phase coherence configuration to be applied by the UE to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The communication interface 1135 can be configured to or otherwise support a component for receiving one or both of the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0193] Fig.12 A block diagram 1200 of a communication manager 1220 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The communication manager 1220 can be an example of aspects of the communication manager 1020, the communication manager 1120, or both, as described herein. The communication manager 1220 or its various components can be examples of components for performing various aspects of reference signal bundling for uplink channel repetition as described herein. For example, the communication manager 1220 may include a control message interface 1225, a phase coherence configuration component 1230, a communication interface 1235, a channel estimation component 1240, a frequency hopping configuration component 1245, a scheduling component 1250, a capability component 1255, a DMRS bundling configuration component 1260, a DMRS combining component 1265, or any combination thereof. Each of these components can communicate with each other directly or indirectly (e.g., via one or more buses).

[0194] According to the examples disclosed herein, the communication manager 1220 can support wireless communication at the base station. The control message interface 1225 can be configured to or otherwise support a component for sending one or more control messages to the UE, the one or more control messages scheduling a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions according to a repetition configuration. The phase coherence configuration component 1230 can be configured to or otherwise support a component for determining a phase coherence configuration to be applied by the UE to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The communication interface 1235 can be configured to or otherwise support a component for receiving one or both of the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0195] In some examples, channel estimation component 1240 can be configured as or otherwise support components for estimating a channel for uplink transmission by combining at least two received demodulation reference signals corresponding to a first set of repetitions or corresponding to a second set of repetitions according to a phase coherence configuration.

[0196] In some examples, DMRS combining component 1265 can be configured or otherwise support components for combining at least two received demodulation reference signals corresponding to a first set of non-contiguous first transmissions or a second set of non-contiguous second transmissions.

[0197] In some examples, DMRS combining component 1265 can be configured or otherwise support components for combining at least two received demodulation reference signals corresponding to consecutive first transmissions of a first set of repetitions or consecutive second transmissions of a second set of repetitions.

[0198] In some examples, the control message interface 1225 can be configured as or otherwise support components for sending a control message indicating a mapping scheme that the UE will use to send one or more of the first set of repetitions and one or more of the second set of repetitions, wherein the phase coherence configuration is determined based on the mapping scheme.

[0199] In some examples, the mapping scheme is one of a round-robin mapping scheme, a sequential mapping scheme, or a half-and-half mapping scheme.

[0200] In some examples, the frequency hopping configuration component 1245 can be configured as or otherwise support components for sending an indication to the UE that the UE will use a first frequency to send a first set of repetitions and use a second frequency to send a second set of repetitions, wherein the phase coherence configuration is determined based on sending the indication.

[0201] In some examples, scheduling component 1250 can be configured as or otherwise support components for sending a scheduling indication to a UE that schedules a first set of repetitions and a second set of repetitions for a physical uplink shared channel transmission, and that the repetitions are to be sent using a type A configuration or a type B configuration, wherein the type A configuration indicates that consecutive repetitions are to be sent in consecutive time slots and the type B configuration indicates that consecutive repetitions are to be sent consecutively across one or more time slots.

[0202] In some examples, scheduling component 1250 can be configured as or otherwise support components for sending a scheduling indication to a UE that schedules a first set of repetitions and a second set of repetitions for a physical uplink control channel transmission, and that the repetitions are to be sent using an inter-slot configuration or an intra-slot configuration, wherein the inter-slot configuration indicates that consecutive repetitions are to be sent in consecutive time slots and the intra-slot configuration indicates that consecutive repetitions are to be sent consecutively across one or more time slots.

[0203] In some examples, capability component 1255 may be configured to or otherwise support components for receiving, from a UE, an indication of UE capabilities for supporting maintaining phase coherence across non-continuous repetitions, wherein the phase coherence configuration is determined based on the UE capabilities.

[0204] In some examples, the DMRS bundling configuration component 1260 can be configured as or otherwise support components for performing the following operations: sending a demodulation reference signal bundling configuration to the UE indicating that the UE will maintain phase coherence for uplink communications, wherein the phase coherence configuration is determined based on sending the demodulation reference signal bundling configuration.

[0205] Fig.13A schematic diagram of a system 1300 including a device 1305 supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The device 1305 may be an example of or include components of a device 1005, a device 1105, or a base station 105 as described herein. The device 1305 may communicate wirelessly with one or more base stations 105, UEs 115, or any combination thereof. The device 1305 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 1320, a network communication manager 1310, a transceiver 1315, an antenna 1325, a memory 1330, a code 1335, a processor 1340, and an inter-station communication manager 1345. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1350).

[0206] The network communications manager 1310 may manage communications with the core network 130 (eg, via one or more wired backhaul links). For example, the network communications manager 1310 may manage the transmission of data communications for client devices such as one or more UEs 115.

[0207] In some cases, the device 1305 may include a single antenna 1325. However, in some other cases, the device 1305 may have more than one antenna 1325, which is capable of sending or receiving multiple wireless transmissions simultaneously. The transceiver 1315 can communicate bidirectionally via one or more antennas 1325, a wired or wireless link, as described herein. For example, the transceiver 1315 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1315 can also include a modem to modulate packets, provide the modulated packets to one or more antennas 1325 for transmission, and demodulate packets received from one or more antennas 1325. The transceiver 1315, or the transceiver 1315 and one or more antennas 1325, can be an example of a transmitter 1015, a transmitter 1115, a receiver 1010, a receiver 1110, or any combination thereof, or components thereof, as described herein.

[0208] Memory 1330 may include RAM and ROM. Memory 1330 may store computer-readable, computer-executable code 1335, which includes instructions that cause device 1305 to perform various functions described herein when executed by processor 1340. Code 1335 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1335 may not be directly executable by processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 1330 may contain a BIOS that may control basic hardware or software operations (such as interaction with peripheral components or devices), etc.

[0209] 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, processor 1340 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks supporting reference signal bundling for uplink channel repetition). For example, device 1305 or a component of device 1305 may include processor 1340 and memory 1330 coupled to processor 1340, and processor 1340 and memory 1330 are configured to perform various functions described herein.

[0210] The inter-site communication manager 1345 can manage communications with other base stations 105 and can include a controller or scheduler for cooperating with other base stations 105 to control communications with UE 115. For example, the inter-site communication manager 1345 can coordinate the scheduling of transmissions to UE 115 to implement various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 can provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0211] According to the examples disclosed herein, the communication manager 1320 can support wireless communication at the base station. For example, the communication manager 1320 can be configured to or otherwise support a component for sending one or more control messages to the UE, the one or more control messages scheduling a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions according to a repetition configuration. The communication manager 1320 can be configured to or otherwise support a component for determining a phase coherence configuration to be applied by the UE to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based on the phase coherence capability of the UE and specifying that phase coherence is maintained for one or more of the first group of repetitions separated from one or more of the second group of repetitions. The communication manager 1320 can be configured to or otherwise support a component for receiving one or both of the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0212] By including or configuring the communication manager 1320 according to the examples described herein, the device 1305 can support techniques for more efficiently utilizing communication resources. By determining a phase coherence configuration for the first and second groups of uplink repetitions, the device 1305 can receive DMRS corresponding to the uplink transmission so that the DMRS can be combined for channel estimation. The technology can support reduced processing (e.g., processor 1340) and efficient communication of various devices by combining bundled DMRS (e.g., the device 1005 can efficiently estimate the channel using the bundled DMRS).

[0213] In some examples, the communication manager 1320 can be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 1315, one or more antennas 1325, or any combination thereof. Although the communication manager 1320 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1320 may be supported or performed by the processor 1340, the memory 1330, the code 1335, or any combination thereof. For example, the code 1335 may include instructions executable by the processor 1340 to cause the device 1305 to perform various aspects of reference signal bundling for uplink channel repetition as described herein, or the processor 1340 and the memory 1330 may be otherwise configured to perform or support such operations.

[0214] Fig.14A flow chart illustrating a method 1400 for supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE or a component thereof as described herein. Figures 1 to 9 The described UE 115 performs. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0215] At 1405, the method may include receiving one or more control messages that schedule a first set of repetitions of an uplink transmission and a second set of repetitions of an uplink transmission. The operations of 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Figure 8 The control message interface 825 described is implemented.

[0216] At 1410, the method may include determining a phase coherence configuration to be applied to transmissions of a first set of repetitions and corresponding first set of demodulation reference signals and transmissions of a second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions. The operations of 1410 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed by Figure 8 The described phase coherence configuration component 830 is performed.

[0217] At 1415, the method may include sending a first set of repetitions and a first set of demodulation reference signals and a second set of repetitions and a second set of demodulation reference signals according to a phase coherence configuration. The operations of 1415 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed as described in reference to Figure 8 The described duplication interface 835 is performed.

[0218] Fig.15 A flow chart illustrating a method 1500 for supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE as described in reference to Figures 1 to 9 The described UE 115 performs. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0219] At 1505, the method may include receiving one or more control messages that schedule a first set of repetitions of an uplink transmission and a second set of repetitions of an uplink transmission. The operations of 1505 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed as described in reference to Figure 8 The control message interface 825 described is implemented.

[0220] At 1510, the method may include determining a phase coherence configuration to be applied to transmissions of a first set of repetitions and corresponding first set of demodulation reference signals and transmissions of a second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions. The operations of 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by Figure 8 The described phase coherence configuration component 830 is performed.

[0221] At 1515, the method may include maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions according to the phase coherence configuration. The operations of 1515 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed as described in reference to Figure 8 The described DMRS transmission component 840 performs.

[0222] At 1520, the method may include maintaining a second phase coherence for each demodulation reference signal transmission corresponding to the second set of repetitions according to the phase coherence configuration. The operations of 1520 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed as described in reference to Figure 8 The described DMRS transmission component 840 performs.

[0223] At 1525, the method may include sending a first set of repetitions and a first set of demodulation reference signals and a second set of repetitions and a second set of demodulation reference signals according to a phase coherence configuration. The operations of 1525 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1525 may be performed as described in reference to Figure 8 The described duplication interface 835 is performed.

[0224] Fig.16 A flow chart illustrating a method 1600 for supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE as described in reference to Figures 1 to 9 The described UE 115 performs. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0225] At 1605, the method may include receiving one or more control messages that schedule a first set of repetitions of an uplink transmission and a second set of repetitions of an uplink transmission. The operations of 1605 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1605 may be performed as described in reference to Figure 8 The control message interface 825 described is implemented.

[0226] At 1610, the method may include receiving a control message indicating a mapping scheme that the UE is to use to send one or more of the first set of repetitions and one or more of the second set of repetitions, wherein the phase coherence configuration is determined based on the mapping scheme. The operations of 1610 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed as described in reference to Figure 8 The control message interface 825 described is implemented.

[0227] At 1615, the method may include determining a phase coherence configuration to be applied to the transmission of the first set of repetitions and the corresponding first set of demodulation reference signals and the transmission of the second set of repetitions and the corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions. The operations of 1615 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed as described in reference to Figure 8 The described phase coherence configuration component 830 is performed.

[0228] At 1620, the method may include sending a first set of repetitions and a first set of demodulation reference signals and a second set of repetitions and a second set of demodulation reference signals according to a phase coherence configuration. The operations of 1620 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1620 may be performed as described in reference to Figure 8 The described duplication interface 835 is performed.

[0229] Fig.17 A flow chart illustrating a method 1700 for supporting reference signal bundling for uplink channel repetition according to aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by a base station or components thereof as described herein. For example, the operations of the method 1700 may be implemented by a base station or components thereof as described herein. Figures 1 to 5 and Figures 10 to 13 The base station 105 described herein performs. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the described functions.

[0230] At 1705, the method may include sending one or more control messages to the UE that schedule a first set of repetitions of uplink transmissions and a second set of repetitions of uplink transmissions according to the repetition configuration. The operations of 1705 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1705 may be performed as described in reference to Fig.12 The control message interface 1225 described is executed.

[0231] At 1710, the method may include determining a phase coherence configuration to be applied by the UE for transmission of a first set of repetitions and corresponding first set of demodulation reference signals and transmission of a second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based on a phase coherence capability of the UE and specifying that phase coherence be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions. The operations of 1710 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1710 may be performed by the UE as described in reference to Fig.12 The described phase coherence configuration component 1230 is performed.

[0232] At 1715, the method may include receiving a first set of repetitions and a first set of demodulation reference signals and one or both of a second set of repetitions and a second set of demodulation reference signals according to a phase coherence configuration. The operations of 1715 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1715 may be performed as described in reference to Fig.12 The communication interface 1235 described above is implemented.

[0233] The following provides an overview of various aspects of the present disclosure:

[0234] Aspect 1: A method for performing wireless communications at a UE, comprising: receiving one or more control messages that schedule a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions; determining a phase coherence configuration to be applied to the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based at least in part on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first group of repetitions that are separated from one or more of the second group of repetitions; and sending the first group of repetitions and the first group of demodulation reference signals and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration.

[0235] Aspect 2: The method according to Aspect 1 also includes: maintaining a first phase coherence for each demodulation reference signal transmission corresponding to a first group of repetitions according to a phase coherence configuration; and maintaining a second phase coherence for each demodulation reference signal transmission corresponding to a second group of repetitions according to the phase coherence configuration.

[0236] Aspect 3: The method according to any one of Aspects 1 to 2 further includes: receiving a control message indicating a mapping scheme, and the UE will use the mapping scheme to send one or more of the first group of repetitions and one or more of the second group of repetitions, wherein the phase coherence configuration is determined at least in part based on the mapping scheme.

[0237] Aspect 4: The method according to aspect 3, wherein the mapping scheme is one of a round-robin mapping scheme, a sequential mapping scheme, or a half-and-half mapping scheme.

[0238] Aspect 5: The method according to any one of Aspects 1 to 4 further includes: determining that the UE will send a first group of repetitions and a second group of repetitions according to a cyclic mapping scheme, so that one or more of the first group of repetitions and one or more of the second group of repetitions will be sent in an alternating order; according to the phase coherence configuration, sending each demodulation reference signal transmission for the first group of repetitions without maintaining phase coherence; according to the phase coherence configuration, sending each demodulation reference signal transmission for the second group of repetitions without maintaining phase coherence.

[0239] Aspect 6: The method according to any one of Aspects 1 and 3 to 4 further includes: maintaining a first phase coherence for a demodulation reference signal transmission corresponding to a continuous first repetition of a first group of repetitions according to a phase coherence configuration; and maintaining a second phase coherence for a demodulation reference signal transmission corresponding to a continuous second repetition of a second group of repetitions according to the phase coherence configuration.

[0240] Aspect 7: The method according to any one of Aspects 1 to 4 and 6 further includes: maintaining a first phase coherence across each consecutive group of demodulation reference signal transmissions corresponding to a first group of repetitions according to a phase coherence configuration; and maintaining a second phase coherence across each consecutive group of demodulation reference signal transmissions corresponding to a second group of repetitions according to a phase coherence configuration.

[0241] Aspect 8: A method according to Aspect 6, wherein receiving one or more control messages includes: receiving a control message specifying that the UE will use a sequential mapping scheme so that two first repetitions in the first group of repetitions will be sent continuously and two second repetitions in the second group of repetitions will be sent continuously.

[0242] Aspect 9: The method according to any one of aspects 6 to 7, wherein receiving one or more control messages includes: receiving a control message specifying that the UE is to use half-and-half mapping such that the first set of repetitions is to be sent continuously and the second set of repetitions is to be sent continuously.

[0243] Aspect 10: A method according to any one of Aspects 1 to 9, wherein receiving one or more control messages includes: receiving a control message indicating that the UE will use a first set of transmission parameters to send a first group of repetitions and will use a second set of transmission parameters to send a second group of repetitions, wherein the first group of repetitions and the corresponding first group of demodulation reference signals are sent according to the first set of transmission parameters and the second group of repetitions and the corresponding second group of demodulation reference signals are sent according to the second set of transmission parameters.

[0244] Aspect 11: A method according to Aspect 10, wherein the first set of transmission parameters and the second set of transmission parameters include one or more uplink beams, at least one uplink power control parameter, and precoding, and at least one value of the second set of transmission parameters is different from the corresponding value of the first set of transmission parameters.

[0245] Aspect 12: The method according to any one of Aspects 1 to 11 further includes: receiving a control message indicating that the UE will use frequency hopping so that the UE will send a first group of repetitions at a first frequency and a second group of repetitions at a second frequency, wherein the phase coherence configuration is determined at least in part based on the indication that the UE will use frequency hopping.

[0246] Aspect 13: The method according to any one of Aspects 1 to 4 and 6 to 12 further includes: determining that the UE will send a first group of repetitions at a first frequency and a second group of repetitions at a second frequency; maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first group of repetitions at the first frequency according to the phase coherence configuration; and maintaining a second phase coherence for each demodulation reference signal transmission corresponding to the second group of repetitions at the second frequency according to the phase coherence configuration.

[0247] Aspect 14: The method according to any one of Aspects 1 and 3 to 5 further includes: determining that the UE will send a first group of repetitions at a first frequency and a second group of repetitions at a second frequency; according to the phase coherence configuration, sending each demodulation reference signal transmission corresponding to the first group of repetitions at the first frequency without maintaining phase coherence; according to the phase coherence configuration, sending each demodulation reference signal transmission corresponding to the second group of repetitions at the second frequency without maintaining phase coherence.

[0248] Aspect 15: The method according to any one of Aspects 1 to 4 and 6 to 13 further includes: determining that the UE will send a first group of repetitions at a first frequency and a second group of repetitions at a second frequency; maintaining a first phase coherence for a demodulation reference signal transmission corresponding to consecutive first repetitions of the first group of repetitions at the first frequency according to the phase coherence configuration; and maintaining a second phase coherence for a demodulation reference signal transmission corresponding to consecutive second repetitions of the second group of repetitions at the second frequency according to the phase coherence configuration.

[0249] Aspect 16: The method according to any one of Aspects 1 to 4, 6 to 13 and 15 further includes: maintaining a first phase coherence across each consecutive group of demodulation reference signal transmissions and corresponding to a first repetition in a first group of repetitions at a first frequency according to a phase coherence configuration; maintaining a second phase coherence across each consecutive group of demodulation reference signal transmissions and corresponding to a second group of repetitions in a second group of repetitions at a second frequency according to the phase coherence configuration.

[0250] Aspect 17: A method according to any one of Aspects 1 to 16, wherein receiving one or more control messages includes: receiving scheduling indications for a first group of repetitions and a second group of repetitions for scheduling physical uplink shared channel transmissions, and the repetitions will be sent using a type A configuration or a type B configuration, wherein the type A configuration indicates that consecutive repetitions will be sent in consecutive time slots, and the type B configuration indicates that consecutive repetitions will be sent continuously across one or more time slots.

[0251] Aspect 18: A method according to any one of Aspects 1 to 17, wherein receiving one or more control messages includes: receiving scheduling indications for a first group of repetitions and a second group of repetitions for scheduling physical uplink control channel transmissions, and the repetitions will be sent using an inter-slot configuration or an intra-slot configuration, wherein the inter-slot configuration indicates that consecutive repetitions will be sent in consecutive time slots, and the intra-slot configuration indicates that consecutive repetitions are sent continuously across one or more time slots.

[0252] Aspect 19: The method according to any one of Aspects 1 to 18 further includes: sending, by the UE, an indication of UE capability for supporting maintaining phase coherence across non-continuous repetitions, wherein one or more control messages are received based at least in part on the indication of UE capability.

[0253] Aspect 20: The method according to any one of Aspects 1 to 19 further includes: receiving a demodulation reference signal bundling configuration indicating that the UE will maintain phase coherence of uplink communications, wherein the phase coherence configuration is determined at least in part based on the received demodulation reference signal bundling configuration.

[0254] Aspect 21: A method for performing wireless communications at a base station, comprising: sending one or more control messages to a UE, the one or more control messages scheduling a first group of repetitions of uplink transmissions and a second group of repetitions of uplink transmissions according to a repetition configuration; determining a phase coherence configuration to be applied by the UE for the transmission of the first group of repetitions and the corresponding first group of demodulation reference signals and the transmission of the second group of repetitions and the corresponding second group of demodulation reference signals, the phase coherence configuration being based at least in part on the phase coherence capability of the UE and specifying maintaining phase coherence for one or more of the first group of repetitions that are separated from one or more of the second group of repetitions; and receiving, according to the phase coherence configuration, the first group of repetitions and the first group of demodulation reference signals and one or both of the second group of repetitions and the second group of demodulation reference signals.

[0255] Aspect 22: The method according to Aspect 21 further includes: estimating a channel for uplink transmission by combining at least two received demodulation reference signals corresponding to the first group of repetitions or corresponding to the second group of repetitions according to the phase coherence configuration.

[0256] Aspect 23: The method according to aspect 22, further comprising: combining at least two received demodulation reference signals corresponding to the non-continuous first transmission of the first set of repetitions or the non-continuous second transmission of the second set of repetitions.

[0257] Aspect 24: The method according to any one of aspects 22 to 23, further comprising: combining at least two received demodulation reference signals corresponding to consecutive first transmissions of the first group of repetitions or consecutive second transmissions of the second group of repetitions.

[0258] Aspect 25: The method according to any one of Aspects 21 to 24 further includes: sending a control message indicating a mapping scheme, and the UE will use the mapping scheme to send one or more of the first group of repetitions and one or more of the second group of repetitions, wherein the phase coherence configuration is determined at least in part based on the mapping scheme.

[0259] Aspect 26: The method according to aspect 25, wherein the mapping scheme is one of a round-robin mapping scheme, a sequential mapping scheme, or a half-and-half mapping scheme.

[0260] Aspect 27: The method according to any one of Aspects 21 to 26 further includes: sending an indication to the UE that the UE will use a first frequency to send a first set of repetitions and a second frequency to send a second set of repetitions, wherein the phase coherence configuration is determined at least in part based on the sending indication.

[0261] Aspect 28: The method according to any one of Aspects 21 to 27 further includes: sending a scheduling indication of a first group of repetitions and a second group of repetitions for scheduling physical uplink shared channel transmissions to the UE, and the repetitions will be sent using a type A configuration or a type B configuration, wherein the type A configuration indicates that continuous repetitions will be sent in continuous time slots and the type B configuration indicates that continuous repetitions will be sent continuously across one or more time slots.

[0262] Aspect 29: The method according to any one of Aspects 21 to 28 also includes: sending a scheduling indication of a first group of repetitions and a second group of repetitions for scheduling physical uplink control channel transmission to the UE, and the repetitions will be sent using inter-slot configuration or intra-slot configuration, wherein the inter-slot configuration indicates that consecutive repetitions will be sent in consecutive time slots, and the intra-slot configuration indicates that consecutive repetitions are sent continuously across one or more time slots.

[0263] Aspect 30: The method according to any one of aspects 21 to 29 further includes: receiving from the UE an indication of UE capabilities for supporting maintaining phase coherence across non-continuous repetitions, wherein the phase coherence configuration is determined at least in part based on the UE capabilities.

[0264] Aspect 31: The method according to any one of Aspects 21 to 30 further includes: sending a demodulation reference signal bundling configuration to the UE indicating that the UE will maintain phase coherence of uplink communication, wherein the phase coherence configuration is determined at least in part based on sending the demodulation reference signal bundling configuration.

[0265] Aspect 32: An apparatus for wireless communication at a UE, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of aspects 1 to 20.

[0266] Aspect 33: An apparatus for wireless communication at a UE, comprising at least one component for performing the method of any one of aspects 1 to 20.

[0267] Aspect 34: A non-transitory computer-readable medium storing a code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 20.

[0268] Aspect 35: An apparatus for performing wireless communications at a base station, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Aspects 21 to 31.

[0269] Aspect 36: An apparatus for wireless communication at a base station, comprising at least one component for performing the method of any one of aspects 21 to 31.

[0270] Aspect 37: A non-transitory computer-readable medium storing a code for wireless communication at a base station, the code comprising instructions executable by a processor to perform the method of any one of aspects 21 to 31.

[0271] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and other implementations are possible. In addition, aspects from two or more methods may be combined.

[0272] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0273] The 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, code elements, 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.

[0274] The various illustrative blocks and components described in conjunction 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0275] 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 or transmitted as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features that implement the functions may also be physically located in different locations, including distribution such that parts of the functions are implemented in different physical locations.

[0276] Computer-readable media include non-transitory computer storage media and communication media including any media that helps to transfer a computer program from one place to another. Non-transitory storage media can be any available media that a general or special-purpose computer can access. As an example and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other non-transitory media that can be used to carry or store required program code components in the form of instructions or data structures and can be accessed by a general or special-purpose computer or a general or special-purpose processor. In addition, any connection is properly referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves are used to transmit software from a website, server or other remote source, the definition of computer-readable media includes coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves. Disk and disc, as used herein, includes 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.

[0277] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") means an inclusive list, so 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0278] In the drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes the similar components. If only the first reference number is used in the specification, the description applies to any one of the similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0279] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or examples within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." In order to provide an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid confusing the concepts of the described examples.

[0280] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but conforms to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: receiving one or more control messages, the one or more control messages scheduling a first set of repetitions of an uplink transmission and a second set of repetitions of the uplink transmission; determining a phase coherence configuration to be applied to transmissions of the first set of repetitions and corresponding first set of demodulation reference signals and transmissions of the second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based at least in part on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions; as well as transmitting the first group of repetitions and the first group of demodulation reference signals, and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration, Also includes: A control message is received indicating a mapping scheme that the UE will use to send the one or more of the first set of repetitions and the one or more of the second set of repetitions, wherein the phase coherence configuration is determined at least in part based on the mapping scheme.

2. The method according to claim 1, further comprising: maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions according to the phase coherence configuration; as well as According to the phase coherence configuration, a second phase coherence is maintained for each demodulation reference signal transmission corresponding to the second set of repetitions.

3. The method according to claim 1, wherein: The mapping scheme is one of a round-robin mapping scheme, a sequential mapping scheme, or a half-and-half mapping scheme.

4. The method according to claim 1, further comprising: determining that the UE is to transmit the first set of repetitions and the second set of repetitions according to a round-robin mapping scheme such that the one or more of the first set of repetitions and the one or more of the second set of repetitions are to be transmitted in an alternating order; sending each demodulation reference signal transmission for the first set of repetitions without maintaining phase coherence in accordance with the phase coherence configuration; and Each demodulation reference signal transmission is sent for the second set of repetitions without maintaining the phase coherence in accordance with the phase coherence configuration.

5. The method according to claim 1, further comprising: maintaining a first phase coherence for demodulation reference signal transmissions corresponding to consecutive first repetitions of the first set of repetitions according to the phase coherence configuration; as well as According to the phase coherence configuration, a second phase coherence is maintained for demodulation reference signal transmissions corresponding to consecutive second repetitions of the second set of repetitions.

6. The method according to claim 5, further comprising: maintaining the first phase coherence across each successive group of demodulation reference signal transmissions corresponding to a first repetition of the first group of repetitions in accordance with the phase coherence configuration; as well as According to the phase coherence configuration, the second phase coherence is maintained across each consecutive group of demodulation reference signal transmissions corresponding to the second group of repetitions.

7. The method according to claim 5, wherein: Receiving the one or more control messages comprises: A control message is received that specifies that the UE is to use a sequential mapping scheme such that two first repetitions in the first set of repetitions are to be sent consecutively and two second repetitions in the second set of repetitions are to be sent consecutively.

8. The method according to claim 5, wherein: Receiving the one or more control messages comprises: A control message is received specifying that the UE is to use a split-half mapping such that the first set of repetitions are to be sent consecutively and the second set of repetitions are to be sent consecutively.

9. The method of claim 1 , wherein receiving the one or more control messages comprises: receiving a control message indicating that the UE is to send the first group of repetitions using a first set of transmission parameters and is to send the second group of repetitions using a second set of transmission parameters, wherein the first group of repetitions and the corresponding first group of demodulation reference signals are sent according to the first set of transmission parameters, and the second group of repetitions and the corresponding second group of demodulation reference signals are sent according to the second set of transmission parameters.

10. The method according to claim 9, wherein The first set of transmission parameters and the second set of transmission parameters include one or more uplink beams, at least one uplink power control parameter and precoding, At least one value of the second set of transmission parameters is different from a corresponding value of the first set of transmission parameters.

11. The method according to claim 1, further comprising: A control message is received indicating that the UE is to use frequency hopping such that the UE is to send the first set of repetitions at a first frequency and the second set of repetitions at a second frequency, wherein the phase coherence configuration is determined based at least in part on the indication that the UE is to use the frequency hopping.

12. The method according to claim 1, further comprising: determining that the UE is to send the first set of repetitions at a first frequency and send the second set of repetitions at a second frequency; maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions at the first frequency in accordance with the phase coherence configuration; as well as According to the phase coherence configuration, a second phase coherence is maintained for each demodulation reference signal transmission corresponding to the second set of repetitions at the second frequency.

13. The method according to claim 1, further comprising: determining that the UE is to send the first set of repetitions at a first frequency and send the second set of repetitions at a second frequency; transmitting each demodulation reference signal transmission corresponding to the first set of repetitions at the first frequency without maintaining phase coherence in accordance with the phase coherence configuration; as well as Each demodulation reference signal transmission corresponding to the second set of repetitions is sent at the second frequency without maintaining phase coherence in accordance with the phase coherence configuration.

14. The method according to claim 1, further comprising: determining that the UE is to send the first set of repetitions at a first frequency and send the second set of repetitions at a second frequency; maintaining a first phase coherence for demodulation reference signal transmissions corresponding to consecutive first repetitions of the first set of repetitions at the first frequency in accordance with the phase coherence configuration; as well as According to the phase coherence configuration, a second phase coherence is maintained for demodulation reference signal transmissions corresponding to consecutive second repetitions of the second set of repetitions at the second frequency.

15. The method according to claim 14, further comprising: maintaining the first phase coherence across each consecutive group of first repetitions of a demodulation reference signal transmission and corresponding to the first group of repetitions at the first frequency in accordance with the phase coherence configuration; as well as According to the phase coherence configuration, the second phase coherence is maintained across each consecutive group of second repetitions of a demodulation reference signal transmission and corresponding to the second group of repetitions at the second frequency.

16. The method of claim 1 , wherein receiving the one or more control messages comprises: Receive scheduling indications for the first group of repetitions and the second group of repetitions for scheduling physical uplink shared channel transmissions, and the repetitions are to be sent using a Type A configuration or a Type B configuration, wherein the Type A configuration indicates that consecutive repetitions are to be sent in consecutive time slots, and the Type B configuration indicates that consecutive repetitions are to be sent consecutively across one or more time slots.

17. The method of claim 1 , wherein receiving the one or more control messages comprises: A scheduling indication of the first group of repetitions and the second group of repetitions for scheduling physical uplink control channel transmission is received, and the repetitions are to be sent using an inter-slot configuration or an intra-slot configuration, wherein the inter-slot configuration indicates that consecutive repetitions are to be sent in consecutive time slots, and the intra-slot configuration indicates that consecutive repetitions are to be sent consecutively across one or more time slots.

18. The method of claim 1, further comprising: An indication of the UE capability for supporting maintaining phase coherence across non-continuous repetitions is sent by the UE, wherein the one or more control messages are received based at least in part on the indication of the UE capability.

19. The method of claim 1, further comprising: A demodulation reference signal bundling configuration is received that indicates that the UE is to maintain phase coherence for uplink communications, wherein the phase coherence configuration is determined based at least in part on receiving the demodulation reference signal bundling configuration.

20. An apparatus for wireless communication, comprising: processor; a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to: receiving one or more control messages, the one or more control messages scheduling a first set of repetitions of an uplink transmission and a second set of repetitions of the uplink transmission; determining a phase coherence configuration to be applied to transmission of the first set of repetitions and corresponding first set of demodulation reference signals and transmission of the second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based at least in part on a phase coherence capability of the apparatus and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions; as well as transmitting the first group of repetitions and the first group of demodulation reference signals, and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration, The instructions are further executable by the processor to cause the device to: A control message is received indicating a mapping scheme, the apparatus is to use the mapping scheme to send the one or more of the first set of repetitions and the one or more of the second set of repetitions, wherein the phase coherence configuration is determined at least in part based on the mapping scheme.

21. The device of claim 20, wherein the instructions are further executable by the processor to cause the device to: maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions according to the phase coherence configuration; and According to the phase coherence configuration, a second phase coherence is maintained for each demodulation reference signal transmission corresponding to the second set of repetitions.

22. The device of claim 20, wherein the instructions are further executable by the processor to cause the device to: determining that the apparatus is to transmit the first set of repetitions and the second set of repetitions according to a round-robin mapping scheme such that the one or more of the first set of repetitions and the one or more of the second set of repetitions are to be transmitted in an alternating order; sending each demodulation reference signal transmission for the first set of repetitions without maintaining phase coherence in accordance with the phase coherence configuration; and Each demodulation reference signal transmission is sent for the second set of repetitions without maintaining the phase coherence in accordance with the phase coherence configuration.

23. An apparatus for wireless communication, comprising: means for receiving one or more control messages scheduling a first set of repetitions of an uplink transmission and a second set of repetitions of the uplink transmission; means for determining a phase coherence configuration to be applied to transmission of the first set of repetitions and corresponding first set of demodulation reference signals and transmission of the second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based at least in part on a phase coherence capability of the apparatus and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions; as well as means for transmitting the first set of repetitions and the first set of demodulation reference signals and the second set of repetitions and the second set of demodulation reference signals according to the phase coherence configuration, Also includes: A component for receiving a control message indicating a mapping scheme, the device will use the mapping scheme to send the one or more of the first set of repetitions and the one or more of the second set of repetitions, wherein the phase coherence configuration is determined at least in part based on the mapping scheme.

24. The apparatus according to claim 23, further comprising: means for maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions in accordance with the phase coherence configuration; as well as means for maintaining a second phase coherence for each demodulation reference signal transmission corresponding to the second set of repetitions in accordance with the phase coherence configuration.

25. The apparatus of claim 23, further comprising: means for determining that the apparatus will transmit the first set of repetitions and the second set of repetitions according to a round-robin mapping scheme such that the one or more of the first set of repetitions and the one or more of the second set of repetitions will be transmitted in an alternating order; means for transmitting each demodulation reference signal transmission for the first set of repetitions without maintaining phase coherence in accordance with the phase coherence configuration; as well as means for sending each demodulation reference signal transmission for the second set of repetitions without maintaining phase coherence in accordance with the phase coherence configuration.

26. 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: receiving one or more control messages, the one or more control messages scheduling a first set of repetitions of an uplink transmission and a second set of repetitions of the uplink transmission; determining a phase coherence configuration to be applied to transmissions of the first set of repetitions and corresponding first set of demodulation reference signals and transmissions of the second set of repetitions and corresponding second set of demodulation reference signals, the phase coherence configuration being based at least in part on a phase coherence capability of the UE and specifying that phase coherence is to be maintained for one or more of the first set of repetitions separated from one or more of the second set of repetitions; as well as transmitting the first group of repetitions and the first group of demodulation reference signals, and the second group of repetitions and the second group of demodulation reference signals according to the phase coherence configuration, The instructions are further executable by the processor to: A control message is received indicating a mapping scheme that the UE will use to send the one or more of the first set of repetitions and the one or more of the second set of repetitions, wherein the phase coherence configuration is determined at least in part based on the mapping scheme.

27. The non-transitory computer readable medium of claim 26, wherein the instructions are further executable by the processor to: maintaining a first phase coherence for each demodulation reference signal transmission corresponding to the first set of repetitions according to the phase coherence configuration; and According to the phase coherence configuration, a second phase coherence is maintained for each demodulation reference signal transmission corresponding to the second set of repetitions.

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