Reference Signal Port Association Determination for Single-Frequency Network Uplink

Abstract

A method, system, and device for wireless communication are described. Some wireless communication systems may support determining reference signal port associations for single frequency network (SFN) uplinks. For example, a user equipment may receive first control signaling that schedules the transmission of sounding reference signals (SRSs) from a plurality of SRS resource sets. The UE may receive second control signaling that includes an indication of one or more SRS resources from a plurality of SRS resource sets and schedules the transmission of one or more SFN uplink messages based at least in part on the indication of the one or more SRS resources. The UE may determine a frequency resource association between one or more phase tracking reference signal (PTRS) ports and one or more of a plurality of demodulation reference signal (DMRS) ports based at least in part on the port association rules and the indication of the one or more SRS resources.

Description

Technical Field

[0001] (Cross - Reference to Related Applications) This patent application claims priority to U.S. Patent Application No. 17 / 869,573, filed Jul. 20, 2022, by Chen et al., entitled "REFERENCE SIGNAL PORT ASSOCIATION DETERMINATION FOR SINGLE FREQUENCY NETWORK UPLINK", which has been assigned to the assignee of this specification and is hereby incorporated by reference in its entirety.

[0002] The following relates to wireless communication, including reference signal port association determination for single frequency network (SFN) uplink.

Background Art

[0003] 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 enable communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multi-connectivity systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems sometimes referred to as New Radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multi-connectivity communication system may include one or more base stations that each support wireless communication for communication devices, sometimes known as user equipment (UE). Summary of the Invention Means for Solving the Problems

[0004] The techniques described relate to an improved method, system, device, and apparatus for determining reference signal port associations for single frequency network (SFN) uplinks. Generally, the techniques described herein may enable a wireless device, such as a user equipment (UE), to determine a frequency resource association between one or more phase tracking reference signal (PTRS) ports associated with one or more SFN uplink messages and one or more demodulation reference signal (DMRS) ports. For example, the UE may receive first control signaling that schedules the transmission of sounding reference signals (SRSs) from a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set. Additionally, the UE may receive second control signaling that includes an indication of one or more SRS resources from the first SRS resource set, the second SRS resource set, or both. Further, the second control signaling may schedule the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, and each DMRS port of the plurality of DMRS ports associated with the one or more SFN uplink messages may be transmitted from a separate set of antenna panels at the UE. In some cases, the UE may determine a frequency resource association between one or more PTRS ports and one or more of the plurality of DMRS ports based on port association rules and an indication of one or more SRS resources from the first SRS resource set, the second SRS resource set, or both. The UE may transmit one or more SFN uplink messages based on the frequency resource association.

[0005] A method for wireless communication in a UE is described. The method includes receiving first control signaling that schedules the transmission of SRS from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set; receiving second control signaling that includes an indication of one or more SRS resources from the set of a plurality of SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, wherein each DMRS port of a set of a plurality of DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of a plurality of separate antenna panels of the UE; determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of the set of a plurality of DMRS ports based on a port association rule and the indication of the one or more SRS resources; and transmitting one or more SFN uplink messages based on the frequency resource association.

[0006] An apparatus for wireless communication in a UE will be described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions cause the apparatus to receive first control signaling for scheduling the transmission of SRS from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set, include an indication of one or more SRS resources from the set of the plurality of SRS resource sets, and receive second control signaling for scheduling the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, wherein each DMRS port of a set of a plurality of DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of a plurality of distinct antenna panels of the UE, and based on a port association rule and the indication of the one or more SRS resources, determine a frequency resource association between one or more PTRS ports and one or more DMRS ports of the set of the plurality of DMRS ports, and based on the frequency resource association, cause the processor to transmit one or more SFN uplink messages, which may be executable by the processor.

[0007] Another apparatus for wireless communication in a UE will be described. The apparatus includes means for receiving first control signaling for scheduling the transmission of SRS from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set, and includes an indication of one or more SRS resources from the set of a plurality of SRS resource sets, and means for receiving second control signaling for scheduling the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, wherein each DMRS port of a set of a plurality of DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of a plurality of separate antenna panels of the UE, and means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of the set of a plurality of DMRS ports based on a port association rule and the indication of the one or more SRS resources, and means for transmitting one or more SFN uplink messages based on the frequency resource association.

[0008] A non-transitory computer-readable medium storing code for wireless communication in a UE is described. The code receives first control signaling for scheduling transmission of SRS from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set, includes an indication of one or more SRS resources from the set of the plurality of SRS resource sets, and receives second control signaling for scheduling transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, wherein each DMRS port of a set of a plurality of DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of a plurality of distinct antenna panels of the UE, and based on a port association rule and the indication of the one or more SRS resources, determines a frequency resource association between one or more PTRS ports and one or more DMRS ports of the set of the plurality of DMRS ports, and may include instructions executable by a processor for transmitting the one or more SFN uplink messages based on the frequency resource association.

[0009] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, the one or more SFN uplink messages may be non-codebook-based messages, the port association rule indicates that matching SRS resource indexes of the first SRS resource set and the second SRS resource set may have the same PTRS port index, and determining the frequency resource association between the one or more DMRS ports and the one or more PTRS ports may be based on one or more SRS resources from the first SRS resource set or from the second SRS resource set.

[0010] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be non-codebook-based messages, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on one or more indicated SRS resources from either a first SRS resource set or a second SRS resource set having the lowest SRS resource set identifier.

[0011] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be non-codebook-based messages, an indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of one or more SRS resources from a first SRS resource set giving a first quantity of PTRS ports and a second indication of one or more SRS resources from a second SRS resource set giving a second quantity of PTRS ports, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on the first quantity of PTRS ports, the second quantity of PTRS ports, or both.

[0012] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining the frequency resource association between one or more DMRS ports and one or more PTRS ports, and either one or more indicated SRS resources from a first SRS resource set or one or more indicated SRS resources from a second SRS resource set may be based on giving a greater quantity of PTRS ports.

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining a frequency resource association between one or more DMRS ports and one or more PTRS ports, where either one or more indicated SRS resources from a first SRS resource set or one or more indicated SRS resources from a second SRS resource set may be based on providing a smaller quantity of PTRS ports.

[0014] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum quantity of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be codebook-based messages, and the port association rule indicates that a shared association between DMRS ports and PTRS port indices as shown in a transmission precoding matrix may be common across a set of multiple transmission precoding matrices associated with one or more SFN uplink messages, and determining a frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on a first transmission precoding matrix associated with a first SRS resource set or may be a first transmission precoding matrix from a second transmission precoding matrix associated with a second SRS resource set.

[0015] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be codebook-based messages, the indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of a first transmission precoding matrix and a second indication of a second transmission precoding matrix, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on the selection of a first transmission precoding matrix or a second transmission precoding matrix based on transmission precoding matrix selection criteria.

[0016] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the transmission precoding matrix selection criteria may be based on the lowest SRS resource set identifier associated with either the first transmission precoding matrix or the second transmission precoding matrix.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the transmission precoding matrix selection criteria may be based on the number of PTRS ports obtained from the first transmission precoding matrix or the second transmission precoding matrix.

[0018] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the transmission precoding matrix selection criteria may be based on a codebook subset associated with the first transmission precoding matrix and the second transmission precoding matrix, and the codebook subset indicates a partial coherent transmission precoding matrix or a non-coherent transmission precoding matrix.

[0019] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the transmission precoding matrix selection criterion may be based on the number of physical uplink shared channel ports associated with a first transmission precoding matrix and a second transmission precoding matrix.

[0020] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, receiving second control signaling may include operations, features, means, or instructions for receiving an indication of a value corresponding to one DMRS port of a set of multiple DMRS ports, where determining a frequency resource association between one or more DMRS ports and one PTRS port of one or more PTRS ports may be based on this value and a table indicating an association between a single PTRS port and the set of multiple DMRS ports.

[0021] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the port association rule indicates that a first set of one or more PTRS ports may be associated with a first SRS resource set, a second set of one or more PTRS ports may be associated with the first SRS resource set, and the first set of one or more PTRS ports may be different from the second set of one or more PTRS ports.

[0022] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining a frequency resource association between one or more DMRS ports and one or more PTRS ports may include operations, features, means, or instructions for determining a first quantity of PTRS ports associated with a first SRS resource set based on an indication of one or more SRS resources and determining a second quantity of PTRS ports associated with a second SRS resource set based on an indication of one or more SRS resources.

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining a frequency resource association between one or more PTRS ports and one or more of a set of DMRS ports may include operations, features, means, or instructions for determining that a first PTRS port index may be associated with a first SRS resource set based on a first bit, and determining that a second PTRS port index may be associated with a second SRS resource set based on a second bit.

[0024] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining a frequency resource association between one or more PTRS ports and one or more of a set of DMRS ports may include operations, features, means, or instructions for determining that each PTRS index of a first set of one or more PTRS port indexes may be associated with a respective DMRS port based on a first set of bits that may be associated with a first SRS resource set, and determining that each PTRS index of a second set of one or more PTRS port indexes may be associated with a respective DMRS port based on a second set of bits that may be associated with a second SRS resource set.

[0025] A method for wireless communication in a network entity will be described. The method includes outputting first control signaling for scheduling the transmission of sounding reference signals (SRS) from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set; outputting second control signaling including an indication of one or more SRS resources from the set of the plurality of SRS resource sets and scheduling the transmission of one or more single-frequency network (SFN) uplink messages based on the indication of the one or more SRS resources; determining a frequency resource association between one or more phase-tracking reference signals (PTRS) ports and one or more demodulation reference signals (DMRS) ports from a set of the plurality of DMRS ports based on a port association rule and the indication of the one or more SRS resources; and receiving one or more SFN uplink messages based on the port association rule.

[0026] An apparatus for wireless communication in a network entity will be described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to output first control signaling for scheduling the transmission of SRS from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set; output second control signaling including an indication of one or more SRS resources from the set of the plurality of SRS resource sets and scheduling the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources; determine a frequency resource association between one or more PTRS ports and one or more DMRS ports from a set of the plurality of DMRS ports based on a port association rule and the indication of the one or more SRS resources; and receive one or more SFN uplink messages based on the port association rule.

[0027] Another apparatus for wireless communication in a network entity will be described. The apparatus includes means for outputting first control signaling for scheduling the transmission of SRS from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set; means for outputting second control signaling including an indication of one or more SRS resources from the set of the plurality of SRS resource sets and scheduling the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources; means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports among a set of a plurality of DMRS ports based on a port association rule and an indication of one or more SRS resources; and means for receiving one or more SFN uplink messages based on the port association rule.

[0028] A non-transitory computer-readable medium storing code for wireless communication in a network entity will be described. The code includes instructions executable by a processor for outputting first control signaling for scheduling the transmission of SRS from a set of a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set; outputting second control signaling including an indication of one or more SRS resources from the set of the plurality of SRS resource sets and scheduling the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources; determining a frequency resource association between one or more PTRS ports and one or more DMRS ports among a set of a plurality of DMRS ports based on a port association rule and an indication of one or more SRS resources; and receiving one or more SFN uplink messages based on the port association rule.

[0029] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be non-codebook-based messages, and the port association rule indicates that matching SRS resource indices of a first SRS resource set and a second SRS resource set may have the same PTRS port index.

[0030] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be non-codebook-based messages, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on one or more indicated SRS resources from either a first SRS resource set or a second SRS resource set having the lowest SRS resource set identifier.

[0031] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be non-codebook-based messages, the indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of one or more SRS resources from a first SRS resource set giving a first quantity of PTRS ports and a second indication of one or more SRS resources from a second SRS resource set giving a second quantity of PTRS ports, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on the first quantity of PTRS ports, the second quantity of PTRS ports, or both.

[0032] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be codebook-based messages, and the port association rule indicates that the sharing association between the DMRS ports and the PTRS port indices as shown in the transmission precoding matrix may be common across a set of multiple transmission precoding matrices associated with one or more SFN uplink messages, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on a first transmission precoding matrix associated with a first SRS resource set or may be from a second transmission precoding matrix associated with a second SRS resource set.

[0033] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the maximum number of PTRS ports for a UE may be greater than 1, one or more SFN uplink messages may be codebook-based messages, the indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of a first transmission precoding matrix and a second indication of a second transmission precoding matrix, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports may be based on the selection of a first transmission precoding matrix or a second transmission precoding matrix based on a transmission precoding matrix selection criterion.

[0034] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, outputting the second control signaling may include operations, features, means, or instructions for outputting an indication of a value corresponding to one DMRS port of a set of a plurality of DMRS ports associated with a UE, where determining a frequency resource association between one or more DMRS ports and one PTRS port of one or more PTRS ports may be based on this value and a table indicating an association between a single PTRS port and the set of a plurality of DMRS ports.

[0035] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the port association rules indicate that a first set of one or more PTRS ports may be associated with a first SRS resource set, a second set of one or more PTRS ports may be associated with the first SRS resource set, and the first set of one or more PTRS ports may be different from the second set of one or more PTRS ports.

[0036] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining a frequency resource association between one or more DMRS ports and one or more PTRS ports may include operations, features, means, or instructions for determining a first quantity of PTRS ports associated with a first SRS resource set based on an indication of one or more SRS resources, and determining a second quantity of PTRS ports associated with a second SRS resource set based on an indication of one or more SRS resources.

[0037] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining a frequency resource association between one or more PTRS ports and one or more of a set of DMRS ports may include operations, features, means, or instructions for determining that a first PTRS port index may be associated with a first SRS resource set based on a first bit, and determining that a second PTRS port index may be associated with a second SRS resource set based on a second bit.

[0038] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining a frequency resource association between one or more PTRS ports and one or more of a set of DMRS ports may include operations, features, means, or instructions for determining that each PTRS index of a first set of one or more PTRS port indexes may be associated with a respective DMRS port based on a first set of bits that may be associated with a first SRS resource set, and determining that each PTRS index of a second set of one or more PTRS port indexes may be associated with a respective DMRS port based on a second set of bits that may be associated with a second SRS resource set.

Brief Description of the Drawings

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DETAILED DESCRIPTION

[0040] Some wireless communication systems may support a single frequency network (SNF) communication scheme. That is, a wireless device such as a user equipment (UE) may receive control signaling scheduling the transmission of one or more SFN uplink messages, where the one or more SFN messages are associated with a set of demodulation reference signal (DMRS) ports or layers, and each DMRS port or layer is transmitted from a plurality of antenna panels at the UE. Additionally, each panel may be associated with a sounding reference signal (SRS) resource set, where each SRS resource set includes one or more SRS resources.

[0041] In addition, some wireless communication systems may support the transmission of phase-tracking reference signals (PTRSs). In some cases, a UE may receive control signaling that schedules uplink transmissions associated with one or more SRS resources of an SRS resource set, and the UE may transmit PTRSs to support phase noise correction. For uplink transmissions based on a single SRS resource set, the UE may determine which time and frequency resources (e.g., of a resource block (RB)) should be used for the transmission of PTRSs based on the frequency association between one or more DMRS ports and one or more PTRS ports. However, in some cases, the UE may receive control signaling that schedules the UE to transmit one or more uplink messages, such as an SFN uplink message associated with multiple SRS resource sets. In such cases, the UE may not be able to determine the number of PTRS ports associated with each SRS resource set, the association between one or more PTRS ports and one or more DMRS ports, or both. The reason is that some techniques for making such a determination may result in conflicting or ambiguous results due to multiple SRS resource sets.

[0042] Accordingly, the techniques described herein may enable determination of reference signal port associations for SFN uplinks with multiple SRS resource sets. For example, a wireless device such as a UE may receive first control signaling that schedules transmission of SRS from a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set. Further, the UE may receive second control signaling that includes an indication of one or more SRS resources from the plurality of SRS resource sets. Additionally, the second control signaling may schedule transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources. That is, each DMRS port of a set of DMRS ports associated with one or more SFN uplink messages may be transmitted from a separate set of antenna panels of the UE. In such a case, the UE may determine a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of the set of DMRS ports based on port association rules and the indication of the one or more SRS resources. In some cases, one or more PTRS ports may be associated with the first SRS resource set and the second SRS resource set, but in some other cases, a first set of PTRS ports of the one or more PTRS ports may be associated with the first SRS resource set, and a second set of PTRS ports of the one or more PTRS ports may be associated with the second SRS resource set. Additionally, the UE may transmit one or more SFN uplink messages based on the frequency resource association.

[0043] Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are then described in the context of resource set configuration, a set of transmission precoding matrix indicators (TPMIs), and a process flow. Aspects of the present disclosure are further illustrated by diagrams of apparatus, diagrams of systems, and flowcharts relating to determination of reference signal port associations for SFN uplinks and will be described with reference to those diagrams.

[0044] FIG. 1 shows an example of a wireless communication system 100 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a network that operates according to a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or other systems and radio technologies including future systems and radio technologies not explicitly recited herein.

[0045] The network entities 105 may be distributed across a geographical area to form the wireless communication system 100 and may include devices of different forms or having different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network devices, among other nomenclatures. In some examples, the network entities 105 and the UEs 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, each network entity 105 may support a coverage area 110 (e.g., a geographical coverage area) over which the UE 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographical area over which the network entity 105 and the UE 115 may support communication of signals by one or more radio access technologies (RATs).

[0046] UE 115 may be distributed 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. UE 115 may be a device of different forms or a device with different capabilities. Some exemplary UEs 115 are shown in FIG. 1. The UE 115 described herein may be able to support communication with various types of devices, such as other UEs 115 or network entities 105, as shown in FIG. 1.

[0047] As described herein, a node of the wireless communication system 100, which may be referred to as a network node or a wireless node, may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, a device, an apparatus, a computing system, one or more components, or another suitable processing entity configured to implement any of the techniques described herein. For example, the node may be the UE 115. As another example, the node may be the network entity 105. As another example, the first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be the UE 115, the second node may be the network entity 105, and the third node may be the UE 115. In another aspect of this example, the first node may be the UE 115, the second node may be the network entity 105, and the third node may be the network entity 105. In yet another aspect of this example, the first node, the second node, and the third node may be different from these examples. Similarly, references to the UE 115, the network entity 105, devices, apparatuses, computing systems, etc. may include the disclosure of the UE 115, the network entity 105, devices, apparatuses, computing systems, etc. that are nodes. For example, the disclosure that the UE 115 is configured to receive information from the network entity 105 also discloses that the first node is configured to receive information from the second node.

[0048] In some examples, network entity 105 may communicate with core network 130, communicate with each other, or communicate with both. For example, network entity 105 may communicate with core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, network entities 105 may communicate with each other either directly (e.g., directly between network entities 105) or indirectly (e.g., via core network 130) via backhaul communication link 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, network entities 105 may communicate with each other via midhole communication link 162 (e.g., according to midhole interface protocol) or fronthole communication link 168 (e.g., according to fronthole interface protocol), or any combination thereof. Backhaul communication link 120, midhole communication link 162, or fronthole communication link 168 may be, among other examples or various combinations thereof, one or more wired links (e.g., electrical link, optical fiber link), one or more wireless links (e.g., wireless link, wireless optical link), or may include them. UE 115 may communicate with core network 130 via communication link 155.

[0049] One or more of the network entities 105 described herein may include a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or a giga NodeB (both of which may be referred to as a gNB), a 5G NB, a next-generation eNB (ng-eNB), a home NodeB, a home eNodeB, or other suitable terms), or may be referred to as the base station 140. In some examples, the network entity 105 (e.g., the base station 140) may be implemented in an aggregated (e.g., monolithic, stand-alone) base station architecture configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node such as the base station 140).

[0050] In some examples, network entity 105 may be implemented in a non - centralized architecture (e.g., non - centralized base station architecture, non - centralized RAN architecture) that is configured to utilize a protocol stack that is physically or logically distributed among two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O - RAN) (e.g., a network configuration sponsored by the O - RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C - RAN)). For example, network entity 105 may include one or more of a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN Intelligent Controller (RIC) 175 (e.g., a Near - Real Time RIC, a Non - Real Time RIC), a Service Management and Orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission reception point (TRP). One or more components of network entity 105 in a non - centralized RAN architecture may be co - located, or one or more components of network entity 105 may be located in distributed locations (e.g., separate physical locations).In some examples, one or more network entities 105 of the non - aggregated RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0051] The functional split between CU160, DU165, and RU170 is flexible and can support different functions depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are implemented in CU160, DU165, or RU170. For example, the functional split of the protocol stack can be adopted between CU160 and DU165 such that CU160 can support one or more layers of the protocol stack and DU165 can support one or more different layers of the protocol stack. In some examples, CU160 can host upper protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functions and signaling (e.g., Radio Resource Control (RRC), Service Data Adaption Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). CU160 may be connected to one or more DU165s or RU170s, and one or more DU165s or RU170s may host lower protocol layers such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functions and signaling, each being at least partially controlled by CU160. Additionally or alternatively, the functional split of the protocol stack can be adopted between DU165 and RU170 such that DU165 can support one or more layers of the protocol stack and RU170 can support one or more different layers of the protocol stack. DU165 can support one or more different cells (e.g., via one or more RU170s).In some cases, the functional split between the CU160 and the DU165, or between the DU165 and the RU170, can be within the protocol layer (e.g., some functions for the protocol layer can be implemented by one of the CU160, DU165, or RU170, while other functions of the protocol layer are implemented by a different one of the CU160, DU165, or RU170). The CU160 can be further functionally split into a CU control plane (CU-CP) function and a CU user plane (CU-UP) function. The CU160 may be connected to one or more DU165s via a midhaul communication link 162 (e.g., F1, F1-c, F1-u), and the DU165 may be connected to one or more RU170s via a fronthaul communication link 168 (e.g., an open fronthaul (FH) interface). In some examples, the midhaul communication link 162 or the fronthaul communication link 168 may be implemented according to an interface (e.g., a channel) between layers of the protocol stack supported by each network entity 105 communicating via such a communication link.

[0052] In a wireless communication system (e.g., wireless communication system 100), the infrastructure and spectrum resources for wireless access can supplement a wired backhaul connection to support wireless backhaul link capabilities and provide an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) can be partially controlled by each other. One or more IAB nodes 104 may be referred to as a donor entity or IAB donor. One or more DUs 165 or one or more RUs 170 can be partially controlled by one or more CUs 160 associated with a donor network entity 105 (e.g., donor base station 140). One or more donor network entities 105 (e.g., IAB donors) can communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access links and backhaul links (e.g., backhaul communication link 120). The IAB node 104 can include an IAB mobile termination (IAB-MT) that is controlled (e.g., scheduled) by the DU 165 of the associated IAB donor. The IAB-MT may include an independent set of antennas for relaying communication with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) used for access via the DU 165 of the IAB node 104 (e.g., called virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 can include a DU 165 that supports communication links with relay chains or additional entities (e.g., IAB nodes 104, UEs 115) within the access network (e.g., downstream).In such a case, one or more components of the non - aggregated RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0053] In the case of the techniques described herein applied in the context of a non - aggregated RAN architecture, one or more components of the non - aggregated RAN architecture may be configured to support reference signal port association determination for an SFN uplink as described herein. For example, some of the operations described as being performed by the UE 115 or the network entity 105 (e.g., the base station 140) may be performed, additionally or alternatively, by one or more components of the non - aggregated RAN architecture (e.g., the IAB node 104, the DU 165, the CU 160, the RU 170, the RIC 175, the SMO 180).

[0054] UE115 may include, or be referred to as, a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, and the "device" may also be referred to as, among other examples, a unit, a station, a terminal, or a client. UE115 may also include, or be referred to as, a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE115 may be implemented in various articles such as consumer electronics, or vehicles, meters, etc., and may also include, among other examples, a wireless local loop (WLL) station, an Internet of Things (IoT) device, any Internet of Everything (IoE) device, or a machine type communications (MTC) device, or be referred to as such.

[0055] As shown in FIG. 1, the UE115 described herein may sometimes act as a relay and may also be capable of communicating with various types of devices such as other UE115s that may sometimes act as relays, and network entities 105 and network devices including, among various examples, a macro eNB or gNB, a small cell eNB or gNB, or a relay base station.

[0056] UE115 and network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" may refer to a set of RF spectrum resources having a defined physical layer structure for supporting communication link 125. For example, the carrier used for communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling that coordinates operation for the carrier, user data, or other signaling. Wireless communication system 100 may support communication with UE115 using carrier aggregation or multi-carrier operation. UE115 may be composed of a plurality of downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) component carriers and time division duplexing (TDD) component carriers. Communication between network entity 105 and other devices may refer to communication between the device and any part of network entity 105 (e.g., an entity, a sub-entity). For example, when referring to network entity 105, the terms "transmit," "receive," or "communicate" may refer to any part of network entity 105 of the RAN that communicates with another device (e.g., directly, or via one or more other network entities 105), such as base station 140, CU160, DU165, RU170).

[0057] The signal waveform transmitted via a carrier may be composed of a plurality of sub-carriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system adopting an MCM technique, a resource element may refer to the resource of one symbol period (e.g., the duration of one modulation symbol) and one sub-carrier. In this case, the symbol period and the sub-carrier spacing may be in an inverse proportional relationship. 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) so as to be able to correspond to a relatively high number of resource elements and a relatively high order of the modulation scheme during the transmission duration for a relatively high communication speed. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and space resources (e.g., spatial layers or beams). The use of a plurality of space resources may further enhance the data rate or data integrity for communication with the UE115.

[0058] The time interval for the network entity 105 or the UE115 may be represented, for example, in multiples of a basic time unit that may refer to a sampling period of T s =1 / ((Δf max ·N f ) seconds, where, for this formula, Δf max may represent the supported sub-carrier spacing, and N fmay represent the supported discrete Fourier transform (DFT) size. The time intervals of 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).

[0059] Each frame may include a plurality of consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a number of slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on the subcarrier spacing. Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period). In some wireless communication systems 100, a slot may be further divided into a plurality of minislots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N f number) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0060] A subframe, slot, minislot, or symbol may be the smallest scheduling unit in the wireless communication system 100 (e.g., in the time domain) 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., within a burst of shortened TTIs (sTTIs)).

[0061] Physical channels may be multiplexed for communication using carriers according to various techniques. The physical control channel and the physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region for the physical control channel (e.g., a control resource set (CORESET)) may be defined by a set of symbol periods and may span the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, each search space set including one or more control channel candidates at one or more aggregation levels configured in a cascaded manner. The aggregation level for a control channel candidate may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with the encoded information for a control information format having a given payload size. The search space sets may include a common search space set configured to send control information to a plurality of UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0062] In some examples, network entity 105 (e.g., base station 140, RU 170) may be movable and thus may provide communication coverage for the moving coverage area 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include a heterogeneous network, for example, where different types of network entities 105 provide coverage to various coverage areas 110 using the same or different radio access technologies.

[0063] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communications (URLLC). The UE 115 may be designed to support ultra-reliability, low latency, or critical functions. Ultra-reliable communication may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial purposes. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0064] In some examples, UE 115 may be configured to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group performing D2D communication may be within the coverage area 110 of a network entity 105 (e.g., base station 140, RU 170), which may support such aspects of D2D communication configured (e.g., scheduled) by the network entity 105. In some examples, one or more UEs 115 in such a group may be outside the coverage area 110 of the network entity 105 or otherwise may not be configured to receive or may not receive transmissions from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, the network entity 105 may facilitate scheduling of resources for D2D communication. In some other examples, D2D communication may be performed between UEs 115 without the involvement of the network entity 105.

[0065] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access functions, routing functions, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), and the evolved packet core (EPC) or 5G core (5GC) 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 with external networks (e.g., a serving gateway (S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UE 115 served by the network entity 105 (e.g., the base station 140) associated with the core network 130. User IP packets may be transferred through a user plane entity that may provide IP address allocation and other functions. The user plane entity may be connected to an IP service 150 for one or more network operators. The IP service 150 may include access to the Internet, an intranet (singular or plural), an IP Multimedia Subsystem (IMS), or a packet-switched streaming service.

[0066] Wireless communication system 100 can operate using one or more frequency bands that can be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region of 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or the decimeter band because the wavelength ranges from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features sometimes called clusters, but UHF waves can penetrate structures well enough for a macrocell to provide service to a UE 115 located indoors. Communication using UHF waves can be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to communication using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0067] Wireless communication system 100 can utilize both licensed and unlicensed RF spectrum bands. For example, wireless communication system 100 can employ NR technologies that use unlicensed bands such as License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or the 5 GHz industrial, scientific, and medical (ISM) band. While operating using an unlicensed RF spectrum band, devices such as network entity 105 and UE 115 can employ carrier sensing for collision detection and avoidance. In some examples, operation using an unlicensed band may be based on a carrier aggregation configuration in cooperation with a component carrier operating using a licensed band (e.g., LAA). Operation using unlicensed spectrum can include, among other examples, downlink transmission, uplink transmission, P2P transmission, or D2D transmission.

[0068] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be collocated in an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with the network entity 105 may be located at various geographical locations. The network entity 105 may include an antenna array having a set of rows and columns of antenna ports that can be used to support beamforming for communication between the network entity 105 and the UE 115. Similarly, the UE 115 may include one or more antenna arrays that can support various MIMO operations or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted via the antenna ports.

[0069] Network entity 105 or UE 115 may use MIMO communication to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. Multiple signals may be transmitted by a transmitting device, for example, via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a distinct spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). The different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0070] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used in a transmitting device or a receiving device (e.g., network entity 105, UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals communicated via antenna elements of an antenna array such that some signals propagating along a particular direction are subject to constructive interference while other signals are subject to destructive interference. Adjustment of the signals communicated via the antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both, to the signals carried via the antenna elements associated with the device. The adjustment associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular direction (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other direction).

[0071] Network entity 105 or UE 115 may use a beam sweeping technique as part of a beamforming operation. For example, network entity 105 (e.g., base station 140, RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to perform a beamforming operation for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by network entity 105 along different directions. For example, network entity 105 may transmit signals according to different sets of beamforming weights associated with different directions of transmission. Transmission along different beam directions may be used to identify (e.g., by a transmitting device such as network entity 105 or by a receiving device such as UE 115) a beam direction for subsequent transmission or reception by network entity 105.

[0072] Some signals, such as data signals associated with a particular receiving device, can be transmitted by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., a direction associated with a receiving device such as receiving network entity 105 or receiving UE 115). In some examples, the beam direction associated with transmission along a single beam direction can be determined based on signals transmitted along one or more beam directions. For example, UE 115 may receive one or more of the signals transmitted by network entity 105 along different directions, and report to network entity 105 an indication of the signal that UE 115 received with the highest signal quality or other acceptable signal quality.

[0073] In some examples, transmission by a device (e.g., by network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to the system bandwidth or a configured set of beams across one or more subbands. Network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)) that may or may not be precoded. UE 115 may provide feedback for beam selection that may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). These techniques are described with reference to signals transmitted along one or more directions by network entity 105 (e.g., base station 140, RU 170), but UE 115 may employ similar techniques to transmit signals multiple times along different directions (e.g., to identify beam directions for subsequent transmission or reception by UE 115), or to transmit signals along a single direction (e.g., to transmit data to a receiving device).

[0074] A receiving device (e.g., UE115) can perform a receiving operation according to a plurality of receiving configurations (e.g., directional listening) when receiving various signals from a network entity (e.g., network entity 105), such as a synchronization signal, a reference signal, a beam selection signal, or other control signals. For example, the receiving device can receive in multiple receiving directions by receiving via different antenna sub-arrays, by processing signals received according to different antenna sub-arrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to the signals received at a plurality of antenna elements of the antenna array, or by processing signals received according to different receive beamforming weight sets applied to the signals received at a plurality of antenna elements of the antenna array, and any of these can be referred to as "listening" according to different receiving configurations or receiving directions. In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receiving configuration may be aligned along a beam direction determined based on listening according to different receiving configuration directions (e.g., the beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality in some other way based on listening in multiple beam directions).

[0075] In some cases, the wireless communication system 100 may support a technique that enables a wireless device such as UE115 to determine a frequency resource association, sometimes referred to as a reference signal port association, for SFN uplink based on port association rules and an indication of one or more SRS resources. For example, UE115 may receive first control signaling that schedules the transmission of SRS signals from a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set. Further, UE115 may receive second control signaling that includes an indication of one or more SRS resources from the plurality of SRS resource sets. Additionally, the second control signaling may schedule the transmission of one or more SFN uplink messages based on the indication of one or more SRS resources. The one or more SFN messages may be associated with a set of DMRS ports, and each DMRS port of the set of DMRS ports may be transmitted from a separate set of antenna panels of UE115. That is, a first DMRS port of the set of DMRS ports may be transmitted from a first antenna panel of UE115 and may be transmitted from a second antenna panel of UE115, where the first antenna panel and the second antenna panel are separate. In some cases, UE115 may determine a frequency resource association between one or more PTRS ports and one or more DMRS ports of the set of DMRS ports based on port association rules and an indication of one or more SRS resources. In some cases, the port association rules may be based on one or more parameters in UE115 (e.g., preconfigured in UE115). Additionally, UE115 may transmit one or more SFN uplink messages based on the frequency resource association.

[0076] Figure 2 shows an example of a wireless communication system 200 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100 or may be implemented by those aspects. For example, the wireless communication system 200 may include one or more network entities 105 (e.g., network entity 105-a and network entity 105-b) and one or more UEs 115 (e.g., UE 115-a), and these network entities 105 and UEs 115 may be examples of the corresponding devices described with reference to FIG. 1. In the example of FIG. 2, the network entity 105-a may be an example of a CU 160, a DU 165, an RU 170, a base station 140, an IAB node 104, or one or more other network nodes as described with reference to FIG. 1. As described in the example of FIG. 2, for the case of an SFN uplink message associated with two or more SRS resource sets, techniques for determining the number of PTRS ports and the PTRS-DMRS association are provided. The techniques described include one or more rules (e.g., called port association rules) that can be statically configured or dynamically indicated to the UE to determine the PTRS-DMRS association for both codebook (CB)-based uplink transmission and non-CB (NCB)-based uplink transmission. Further, the techniques described include one or more rules for determining the PTRS-DMRS association for a first scenario in which each PTRS port is also transmitted in an SFN manner such that each PTRS is associated with both SRS resource sets, and one or more rules for determining the PTRS-DMRS association for a second scenario in which one or more PTRS ports are associated with a first SRS resource set and another one or more PTRS ports are associated with a second SRS resource set and each PTRS port is not transmitted in an SFN manner.

[0077] Some wireless communication systems, such as the wireless communication system 200, may support CB-based and NCB-based uplink transmissions (e.g., physical uplink shared channel (PUSCH) transmissions). In the case of CB-based transmission, a wireless device such as the UE 115 may receive control signaling indicating a configuration associated with one SRS resource set (e.g., an SRS resource set whose use is set in a codebook), where one SRS resource set may include a maximum number of SRS resources (e.g., up to 4 SRS resources). Additionally, the UE 115 may receive additional control signaling (e.g., downlink control information (DCI)) for scheduling uplink transmission (e.g., PUSCH), where the SRS resource indicator (SRI) field may indicate the SRS resource from the SRS resource set for the UE 115 to perform uplink transmission. In some cases, the additional control signaling may include additional fields (e.g., precoding information and layer number fields) such as a TPMI field indicating the number of layers (e.g., rank) and TPMI (e.g., precoder) for uplink transmission.

[0078] In the case of NCB-based transmission, a wireless device such as UE115 may receive control signaling indicating a configuration associated with one SRS resource set (e.g., an SRS resource set whose use is configured for non-codebook), where one SRS resource set may include a maximum number of SRS resources (e.g., a maximum of 4 SRS resources), and each SRS resource may be associated with a single port. Additionally, UE115 may receive additional control signaling (e.g., DCI) for scheduling uplink transmission (e.g., PUSCH), where the SRI field may indicate one or more SRS resources from the SRS resource set for which UE115 performs uplink transmission. In some cases, UE115 may determine the number of layers (e.g., referred to as rank) for uplink transmission based on the number of indicated SRS resources. Additionally, UE115 may transmit uplink transmission using the same precoder associated with one or more of the indicated SRS resources.

[0079] In addition, some wireless communication systems may support uplink transmission repetitions using multiple sets of transmission parameters. That is, UE 115 may receive control signaling (e.g., a single DCI) that schedules multiple uplink transmission repetitions (e.g., time-division multiplexed PUSCH repetitions) associated with a transport block (TB), and each uplink transmission repetition of the multiple uplink transmission repetitions may be associated with a set of uplink transmission repetitions from a plurality of sets of uplink transmission repetitions, and each set of uplink transmission repetitions is associated with one or more transmission parameters (e.g., beam index, power control parameter, spatial relationship parameter, transmission configuration indicator (TCI) state, precoding, etc.). That is, each set of uplink transmission repetitions of the plurality of sets of uplink transmission repetitions may be associated with an SRS resource set, where each SRS resource set is associated with a TRP (e.g., two sets of uplink transmission repetitions correspond to two SRS resource sets).

[0080] For example, UE115 may receive control signaling that schedules the transmission of SRS signals from a plurality of SRS resource sets, including a first SRS resource set associated with a first TRP and a second SRS resource set associated with a second TRP. In some cases, UE115 may receive additional control signaling (e.g., DCI) that schedules a plurality of uplink transmissions associated with a TB, where the set of uplink transmissions includes a first set of uplink transmissions and a second set of uplink transmissions. Additionally, the additional control signaling may include a plurality of SRI fields (e.g., for both CB-based transmissions and NCB-based transmissions), where each SRI field is associated with each set of uplink transmission repetitions, such as a first SRI field associated with the first set of uplink transmissions and a second SRI field associated with the second set of uplink transmissions. Further, each SRI field may be associated with a set of transmission parameters that may include at least an indication of the beam to be used by UE115 for the transmission of each set of uplink transmissions and a set of power control parameters to be used by UE115 for the transmission of each set of uplink transmissions. The first set of transmission parameters may be associated with the first SRS resource set, and the second set of transmission parameters may be associated with the second SRS resource set. In some cases (e.g., CB-based uplink transmissions), the additional control signaling may include a plurality of TPMI fields (e.g., two TPMI fields for indicating two precoders for two sets of repetitions) each indicating a precoder associated with each set of uplink transmissions. Thus, UE115 may transmit the first set of uplink transmissions to the first TRP associated with the first SRS resource set according to the first set of transmission parameters and transmit the second set of uplink transmissions to the second TRP associated with the second SRS resource set according to the second set of transmission parameters (e.g., transmit in a TDM manner).

[0081] In addition, some wireless communication systems may support the SFN communication mode. That is, the UE 115 may receive a control message (e.g., a single DCI), sometimes called an SFN uplink message, that schedules one or more uplink transmissions according to the SFN communication mode. That is, each DMRS port (e.g., layer) of a set of DMRS ports associated with one or more SFN uplink transmissions may be transmitted from a separate set of antenna panels in the UE 115, where each antenna panel is associated with a set of transmission parameters (e.g., transmission beam, precoder, power control parameter). For example, one or more uplink transmissions may be associated with a set of DMRS ports including a first DMRS port and a second DMRS port. Thus, the UE 115 may transmit the first DMRS port via the first antenna panel of the set of antenna panels in the UE 115 and via the second antenna panel of the set of antenna panels in the UE 115. In addition, the UE 115 may transmit the second DMRS port via the first antenna panel of the set of antenna panels in the UE 115 and via the second antenna panel of the set of antenna panels in the UE 115.

[0082] In some cases, the wireless communication system may support the transmission of PTRS (e.g., for phase noise correction). That is, UE115 may transmit PTRS using one or more resources (e.g., resource elements of one or more RBs) within a set of resources allocated for uplink transmission. Specifically, for a given frequency resource, UE115 may transmit PTRS in a time resource different from the time resource used for transmitting DMRS (e.g., OFDM symbol) (e.g., if DMRS is present in a symbol for phase correction, PTRS may not be required in that symbol). In some cases, the transmission of PTRS may be sparsely spaced in the frequency domain. For example, UE115 may transmit one tone per PTRS port according to the spacing in the frequency domain (e.g., one tone per port for every two or four RBs). The transmission of PTRS may be relatively dense in the time domain. For example, UE115 may transmit PTRS according to the periodicity in the time domain (e.g., every one, two, or four OFDM symbols).

[0083] In some cases (e.g., NCB-based uplink transmission), (e.g., in a scenario where the maximum number of PTRS ports is configured to be greater than 1) the actual number of PTRS ports is based on the SRI field. For example, UE 115 may receive control signaling including one or more SRI fields indicating one or more SRS resources, where each SRS resource is associated with (e.g., configured using) a PTRS port (e.g., via a PTRS port index). In some cases, an SRS resource (e.g., an SRS resource indicated via an SRI field) may be associated with an index value that is the same as the PTRS port index value such that a single PTRS port can be associated with the SRS resource. Alternatively, the SRS resource may be associated with an index value that is different from the PTRS port index value such that multiple PTRS ports (e.g., two PTRS ports) can be associated with the SRS resource. In some other cases (e.g., CB-based uplink transmission), UE 115 may determine the number of PTRS ports for uplink transmission based on the TPMI.

[0084] In addition, the PTRS port may be associated with a DMRS port, which may be referred to as port association (or PTRS-DMRS association). This port association is the basis for determining which resource elements UE 115 should use to transmit the PTRS. It may be desirable to transmit the PTRS associated with the DMRS port such that UE 115 can transmit the PTRS on a layer (e.g., a strong layer) associated with signal characteristics above a threshold based on the associated DMRS port (e.g., when two or more layers or DMRS ports are scheduled).

[0085] In some cases, the UE 115 may receive control signaling indicating a configuration associated with PTRS transmission (e.g., RRC configured via the RRC parameter PTRS-UplinkConfig). For example, the configuration may indicate the number of ports configured for PTRS, sometimes referred to as PTRS ports (e.g., maxNrofPorts). In some cases, the number of PTRS ports may be 1 (e.g., for a full coherent UE 115) or 2 (e.g., for a cyclic prefix OFDM waveform). Additionally, the control signaling indicating the configuration (e.g., uplink DCI format 0_1 or 0_2) may include a port association field (e.g., a PTRS-DMRS association field). In some cases, the port association field may be 2 bits (e.g., when uplink PTRS is configured, cyclic prefix OFDM is used, the transform precoder is disabled, and MaxRank>1).

[0086] In some cases, the number of PTRS ports associated with uplink transmission may be 1 (e.g., PTRS port 0 exists). In such a case, the UE 115 may determine the association between the PTRS port and the DMRS port (e.g., one of four DMRS ports) based on the value indicated in the port association field of the control signaling. That is, the UE 115 may be pre-configured with a port association table that can define one or more associations between one or more values indicated in the port association field and one or more DMRS ports.

[0087] In some other cases, the number of PTRS ports associated with uplink transmission may be greater than 1 (for example, PTRS ports 0 and 1 exist). In such a case, the UE 115 may determine a first association between a first PTRS port (for example, PTRS port 0) and one or more DMRS ports of a set of DMRS ports associated with the first PTRS port (for example, one or more DMRS ports associated with or "shared" by PTRS port 0) based on the first bit in the port association field, and the UE 115 may determine a second association between a second PTRS port (for example, PTRS port 1) and one or more DMRS ports of a set of DMRS ports associated with the second PTRS port (for example, one or more DMRS ports associated with or "shared" by PTRS port 1) based on the second bit in the port association field.

[0088] In addition, the UE 115 may determine a set of DMRS ports that share a first PTRS port and a set of DMRS ports that share a second PTRS port based on one or more rules that depend on whether the transmission is CB or NCB. In some cases (e.g., NCB-based uplink transmission), the UE 115 may determine a set of DMRS ports associated with the first PTRS port and a set of DMRS ports associated with the second PTRS port based on the SRI field in the control message that schedules the associated uplink message. That is, the SRI field may indicate one or more SRS resources, each indicated SRS resource may be associated with one or more indicated DMRS ports, and one or more DMRS ports are indicated via additional fields such as the antenna port field in the control message. In addition, each SRS resource may be configured using a PTRS port index. For example, the UE 115 may receive a control message indicating a configuration in which a first set of SRS resources (e.g., SRS resources 0, 1) is associated with a first PTRS port (e.g., PTRS port 0) and a second set of SRS resources (e.g., SRS resources 2, 3) is associated with a second PTRS port (e.g., PTRS port 1). In addition, the control message may include an SRI field indicating the first set of SRS resources and the second set of SRS sources, an antenna port indicating a plurality of DMRS ports (e.g., DMRS ports 0 to 3), and a port association field (e.g., a PTRS-DMRS port association field) indicating that a first set of DMRS ports from the plurality of DMRS ports is associated with the first PTRS port (e.g., DMRS ports 0 to 1 share PTRS port 0) and a second set of DMRS ports from the plurality of DMRS ports is associated with the second PTRS port (e.g., DMRS ports 2 to 3 share PTRS port 1).

[0089] In some other cases (e.g., CB-based uplink transmission), the UE 115 may determine a set of DMRS ports associated with a first PTRS port and a set of DMRS ports associated with a second PTRS port based on the TPMI in a control message that schedules an associated uplink message (e.g., for a partially coherent or non-coherent UE 115). For example, a first set of uplink antenna ports (e.g., PUSCH antenna ports 1000 and 1002) indicated in the TPMI may be associated with a first PTRS port (e.g., PTRS port 0), and a second set of uplink antenna ports (e.g., PUSCH antenna ports 1001 and 1003) indicated in the TPMI may be associated with a second PTRS port (e.g., PTRS port 1). In addition, the first set of DMRS ports may be associated with the first set of uplink antenna ports, and the second set of DMRS ports may be associated with the second set of uplink antenna ports. That is, the first set of DMRS ports may correspond to one or more layers transmitted using the first set of antenna ports, and the second set of DMRS ports may correspond to one or more layers transmitted using the second set of antenna ports. Thus, the first set of DMRS ports may be associated with the first PTRS port, and the second set of DMRS ports may be associated with the second PTRS port. For example, the control message may include a TPMI field indicating a set of layers (e.g., three layers) and a TPMI index (e.g., a TPMI index of 2), and an antenna port field indicating a plurality of DMRS ports corresponding to the set of layers. Thus, the first DMRS port is associated with the first layer of the set of layers, the second DMRS port is associated with the second layer of the set of layers, and the third DMRS port is associated with the third layer of the set of layers.In addition, the first layer may be transmitted via a first set of antenna ports associated with the first PTRS port (e.g., PUSCH antenna ports 1000 and 1002), the second layer may be transmitted via a second set of antenna ports associated with the second PTRS port (e.g., PUSCH antenna port 1001), and the third layer may be transmitted via a third set of antenna ports associated with the second PTRS port (e.g., PUSCH antenna port 1003). Thus, the first DMRS port may be associated with the first PTRS port and the second DMRS port, and the third DMRS port may be associated with the second PTRS port.

[0090] However, in some cases, such as SFN communication, UE 115 may receive control signaling indicating a plurality of SRS resource sets associated with an uplink message, such as an SFN uplink message. That is, each DMRS port (e.g., layer) associated with an SFN uplink message may be associated with a plurality of SRS resource sets, and the plurality of precodings may be indicated via a plurality of SRI fields (e.g., in the case of an NCB-based uplink) or via a plurality of TPMI (e.g., in the case of a CB-based uplink). For example, each SRI field of the plurality of SRI fields may indicate one or more SRS resources from the corresponding SRS resource set of the plurality of SRS resource sets (e.g., the same number of SRS resources in the first SRS resource set of the plurality of resource sets and the second resource set of the plurality of resource sets may be indicated by two SRI fields, and the same number corresponds to the number of layers or DMRS ports). In another example, each TPMI of the plurality of TPMI may indicate the same number of layers that may correspond to the number of columns of each TPMI matrix (e.g., the number of uplink ports, or the number of rows of each TPMI matrix may be the same or different, and the codebookSubset{{fullyAndPartialAndNonCoherent,partialAndNonCoherent,noncoherent}} of each TPMI of the plurality of TPMI may be the same or different). In such cases, UE 115 may not be able to determine the number of PTRS ports associated with the uplink message and the port association between the number of PTRS ports and one or more DMRS ports associated with the uplink message.

[0091] Accordingly, the techniques described herein may enable a wireless device, such as UE115-a, to determine one or more reference signal port associations for SFN uplink. For example, UE115-a may communicate with network entity 105-a via communication link 125-a and communicate with network entity 105-b via communication link 125-b. In some cases, UE115-a may receive control signaling 205-a that schedules the transmission of SRS from a plurality of SRS resource sets including at least a first SRS resource set (e.g., and a first TCI state) associated with beam 210-a and a second SRS resource set (e.g., and a second TCI state) associated with beam 210-b. Further, UE115-a may receive control signaling 205-b that includes an indication of one or more resource allocations for an SFN uplink message, such as RB250-a and RB250-b. Additionally, control signaling 205-b may schedule the transmission of one or more SFN uplink messages, such as uplink message 215-a and uplink message 215-b.

[0092] In such a case, each DMRS port 220 of the set of DMRS ports 220 associated with the uplink message 215 can be transmitted from a set of antenna panels 225. For example, DMRS port 220-a can be associated with layer 230-a, and DMRS port 220-b can be associated with layer 230-b. Additionally, TPMI 235-a or SRI 240-a can be associated with a first resource set, and TPMI 235-b or SRI 240-b can be associated with a second resource set. Thus, layer 230-a can be transmitted from panel 225-a associated with the first SRS resource set via port 245-a which can be uplink port 245 (e.g., PUSCH port 245), and can be transmitted from panel 225-b associated with the second SRS resource set via port 245-c. Additionally, layer 230-b can be transmitted from panel 225-a associated with the first SRS resource set via port 245-b, and can be transmitted from panel 225-b associated with the second SRS resource set via port 245-d. That is, UE 115-a can transmit uplink message 215-a from panel 225-a to network entity 105-a via beam 210-a, and can transmit uplink message 215-b from panel 225-b to network entity 105-b via beam 210-b, where uplink message 215-a and uplink message 215-b each include layer 230-a and layer 230-b.

[0093] In addition, UE115-a may determine the frequency resource association between one or more PTRS ports 255 and one or more DMRS ports 220, such as DMRS port 220-a and DMRS port 220-b, based on port association rules and the indication of one or more SRS resource sets. In some cases, the maximum number of PTRS ports 255 for UE115-a may be 1 (e.g., UE115-a does not expect to be configured with maxNPorts = 2 for PTRS for SFN PUSCH). In this example, since only one PTRS port 255 is configured, UE115-a may determine the frequency resource association between PTRS port 255 and another DMRS port 220 based on the value indicated in control signaling 205-b. That is, control signaling 205-b may indicate a value corresponding to a DMRS port 220, such as DMRS port 220-a, and UE115-a may determine the frequency resource association between PTRS port 255 and DMRS port 220-a based on this value and a table indicating the association between the single PTRS port 255 and the plurality of DMRS ports 220.

[0094] In addition, control signaling 205-b may indicate RB250-a, whereby DMRS port 220-a and PTRS port 255 are associated with the same frequency resource within RB250-a. In the example of FIG. 2, the frequency density of PTRS may be per two RB250s, and the time density of PTRS may be per non-DMRS symbol. In addition, RB250-a and RB250-b may carry data 260 (e.g., uplink data 260).

[0095] In some other cases, the maximum number of PTRS ports 255 for UE115-a may be greater than 1. In this example, since there are multiple PTRS ports 255, UE115-a may determine the frequency resource association between a PTRS port 255 and another DMRS port 220 based on port association rules and the indication of one or more SRS resource sets, as described in more detail with reference to FIGS. 3 and 4.

[0096] Additionally or alternatively, a first set of one or more PTRS ports 255 may be associated with a first SRS resource set, and a second set of one or more PTRS ports 255 may be associated with a second SRS resource set, where the first set and the second set are different (e.g., the PRTS-DMRS association is per SRS resource set). For example, a first PTRS port 255 (e.g., PTRS port 0) may be associated with DMRS port 220-a and the first SRS resource set, and a second PTRS port 255 (e.g., PTRS port 1) may be associated with DMRS port 220-b and the second SRS resource set (e.g., one PTRS port 255 per SRS resource set). In such cases, DMRS port 220-a and DMRS port 220-b may be associated with both the first SRS resource set and the second SRS resource set. In some cases, for each PTRS port 255, UE115 may determine the resource element offset for each PTRS port 255 using the associated DMRS port 220 (e.g., it may be determined along with determining whether the PTRS port 255 is associated with the first SRS resource set or the second SRS resource set).

[0097] In some cases, the maximum number of PTRS ports 255 for UE115 can be set to two or more (e.g., up to four). In such cases, the number of PTRS ports 255 associated with the first SRS resource set may be based on TPMI235-a (e.g., for CB) or SRI240-a (e.g., for NCB), and the number of PTRS ports 255 associated with the second SRS resource set may be based on TPMI235-b (e.g., for CB) or SRI240-b (e.g., for NCB).

[0098] In some cases (e.g., maxRank = 2), the first bit of the port association field may indicate which of the DMRS ports 220 is associated with the first PTRS port 255 (e.g., PTRS port 0 associated with the first SRS resource set), and the second bit of the port association field may indicate which of the DMRS ports 220 is associated with the second PTRS port 255 (e.g., PTRS port 1 associated with the second SRS resource set). In some other cases (e.g., maxRank>2), the first port association field (e.g., 2 bits) may indicate which DMRS ports 220 are associated with each PTRS port 255 for the first SRS resource set, and the second port association field (e.g., 2 bits) may indicate which DMRS ports 220 are associated with each PTRS port 255 for the second SRS resource set.

[0099] Much of this disclosure is described in the context of UE115 determining one or more reference signal port associations, but this should not be considered a limitation of this disclosure. In this regard, network entity 105 may perform the functions described herein to determine one or more reference signal port associations in addition to, or instead of, the association between PTRS and DMRS.

[0100] Figure 3 shows an example of a resource set configuration 300 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. In some examples, the resource set configuration 300 may implement aspects of the wireless communication system 100 and the wireless communication system 200, or may be implemented by those aspects. For example, the resource set configuration 300 may be implemented by one or more network entities 105 and one or more UEs 115, which may be examples of the corresponding devices described with reference to FIG. 1. In some cases, the UE 115 may determine a frequency resource association between one or more PTRS ports 315 and one or more DMRS ports based on port association rules and one or more of the indicated SRS resources 310 from the SRS resource set 305-a, the SRS resource set 305-b, or both.

[0101] In some cases, the UE 115 may receive first control signaling that schedules the transmission of SRS from a plurality of SRS resource sets, including at least the SRS resource set 305-a and the SRS resource set 305-b. Further, the UE 115 may receive second control signaling that includes an indication of one or more SRS resources 310 from the SRS resource set 305-a, the SRS resource set 305-b, or both. Additionally, the second control signaling may schedule one or more SFN uplink messages (e.g., NCB-based uplink messages). The UE 115 may determine a frequency resource association between one or more PTRS ports 315 and one or more DMRS ports based on port association rules and one or more of the indicated SRS resources 310 from the SRS resource set 305-a, the SRS resource set 305-b, or both.

[0102] In some cases, each PTRS port 315 may be associated with (e.g., may be transmitted in an SFN manner) SRS resource set 305-a and SRS resource set 305-b, and the maximum number of PTRS ports 315 for UE 115 may be greater than 1 (i.e., maxNrofPorts = 2). In addition, each SRS resource 310 within SRS resource set 305-a or within SRS resource set 305-b may be associated with either PTRS port 315-a or PTRS port 315-b. Further, the first SRI field in the second control signaling may indicate the number of SRS resources 310 from SRS resource set 315-a, and the second SRI field in the second control signaling may indicate the number of SRS resources 310 from SRS resource set 315-b.

[0103] In some cases, the port association rule may indicate that the matching SRS resource indexes of SRS resource set 305-a and SRS resource set 305-b have the same PTRS port index. Thus, in this first example of the port association rule, UE 115 may expect that the i-th indicated SRS resource (e.g., the first indicated SRS resource) from the first SRS resource set 305-a is configured with the same PTRS port index as the i-th indicated SRS resource (e.g., the first indicated SRS resource set) from the second SRS resource set 305-b. For example, the first SRI field in the second control signaling may indicate SRS resources 310-a (e.g., associated with the first index) and 310-b (e.g., associated with the second index) from SRS resource set 305-a, and the second SRI field in the second control signaling may indicate SRS resources 310-e (e.g., associated with the first index) and 310-h (e.g., associated with the second index). Thus, SRS resource 310-a and SRS resource 310-e may be associated with the same PTRS port index corresponding to PTRS port 315-a. Additionally, SRS resource 310-b and SRS resource 310-h may be associated with the same PTRS port index corresponding to PTRS port 315-b.

[0104] In another example, the first SRI field in the second control signaling may indicate SRS resources 310-a, 310-b, 310-c, and 310-d from the SRS resource set 305-a, and the second SRI field in the second control signaling may indicate SRS resources 310-e, 310-f, 310-g, and 310-h. Thus, SRS resource 310-a and SRS resource 310-e may be associated with the same PTRS port index that may correspond to PTRS port 315-a, SRS resource 310-b and SRS resource 310-f may be associated with the same PTRS port index that may correspond to PTRS port 315-b, SRS resource 310-c and SRS resource 310-g may be associated with the same PTRS port index that may correspond to PTRS port 315-a, and SRS resource 310-d and SRS resource 310-h may be associated with the same PTRS port index that may correspond to PTRS port 315-b. That is, the first and third DMRS ports may be associated with PTRS port 315-a, and the second and fourth DMRS ports may be associated with PTRS port 315-b (e.g., the PTRS-DMRS association field in the DCI indicates "10", and thus, PTRS port 315-a, or PTRS port 0, is associated with the third scheduled DMRS based on the most significant bit in the PTRS-DMRS association field being 1, and PTRS port 315-b, or PTRS port 0, is associated with the second scheduled DMRS port based on the least significant bit in the PTRS-DMRS association field being 0).

[0105] Additionally or alternatively, UE 115 may determine the quantity and frequency resource association of PTRS ports 315 based on one or more SRS resources 310 from SRS resource set 305-a indicated in the first SRI field of the second control signaling, where SRS resource set 305-a is associated with a lower SRS resource set identifier than SRS resource set 305-b (e.g., UE 115 may ignore the PTRS port index configured for SRS resource 310 from SRS resource set 305-b, or UE 115 may not expect SRS resource 310 from SRS resource set 305-b to be configured using the PTRS port index). For example, the first SRI field in the second control signaling may indicate SRS resources 310-a and 310-b, and thus UE 115 determines the quantity and frequency resource association of PTRS ports 315 based on the PTRS port index for SRS resource 310-a (associated with PTRS port 315-a, for example) and the PTRS port index for SRS resource 310-b (associated with PTRS port 315-b, for example). In another example, the first SRI field in the second control signaling may indicate SRS resources 310-a, 310-b, 310-c, and 310-d, and thus UE 115 determines the quantity and frequency resource association of PTRS ports 315 based on the PTRS port index for SRS resource 310-a (associated with PTRS port 315-a, for example), the PTRS port index for SRS resource 310-b (associated with PTRS port 315-b, for example), the PTRS port index for SRS resource 310-c (associated with PTRS port 315-a, for example), and the PTRS port index for SRS resource 310-d (associated with PTRS port 315-b, for example).

[0106] Additionally or alternatively, the UE 115 may determine the quantity and frequency resource association of the PTRS ports 315 based on the first quantity of the PTRS ports 315 associated with the SRS resource 310 indicated (e.g., via the first SRI field) from the SRS resource set 305-a, the second quantity of the PTRS ports 315 associated with the SRS resource 310 indicated (e.g., via the second SRI field) from the SRS resource set 305-b, or both. That is, the UE 115 may determine which of the SRS resource 310 indicated from the SRS resource set 305-a or the SRS resource 310 indicated from the SRS resource set 305-b may result in a larger quantity of PTRS ports 315 or a smaller quantity of PTRS ports 315 (which may be configured for the UE 115). In some cases, the UE 115 may determine the quantity and frequency resource association of the PTRS ports 315 based on the SRS resource 310 indicated from the SRS resource set 305-a, where the first quantity of the PTRS ports 315 is smaller than the second quantity of the PTRS ports 315. Alternatively, the UE 115 may determine the quantity and frequency resource association of the PTRS ports 315 based on the SRS resource 310 indicated from the SRS resource set 305-a, where the first quantity of the PTRS ports 315 is larger than the second quantity of the PTRS ports 315. For example, the first SRI field in the second control signaling may indicate the SRS resources 310-a and 310-b from the SRS resource set 305-a, and the second SRI field in the second control signaling may indicate the SRS resources 310-e and 310-h. In such a case, the UE 115 may determine that the SRS resources 310-a and 310-b are associated with two PTRS ports 315, and the SRS resources 310-e and 310-h are associated with two PTRS ports.Accordingly, UE 115 may determine the quantity and frequency resource association of PTRS port 315 based on SRS resource 310-a and SRS resource 310-b or SRS resource 310-e and SRS resource 310-h.

[0107] Figures 4A and 4B show an example of TPMI set 400, including TPMI set 400-a and TPMI set 400-b, which supports reference signal port association determination for SFN uplink according to one or more aspects of the present disclosure. In some examples, TPMI set 400 may implement or may be implemented by aspects of wireless communication system 100, wireless communication system 200, and resource set configuration 300. For example, TPMI set 400 may be implemented by one or more network entities 105 and one or more UEs 115, and these network entities and UEs may be examples of the corresponding devices described with reference to FIG. 1. In some cases, UE 115 may determine the frequency resource association between one or more PTRS ports and one or more DMRS ports based on port association rules and one or more indicated SRS resources from the first SRS resource set, the second SRS resource set, or both.

[0108] In some cases, UE115 may receive first control signaling for scheduling SRS transmissions from a plurality of SRS resource sets, including at least a first SRS resource set and a second SRS resource set. Further, UE115 may receive second control signaling including an indication of one or more SRS resources from the first SRS resource set, the second SRS resource set, or both. Additionally, the second control signaling may schedule one or more SFN uplink messages (e.g., CB-based uplink messages). UE115 may determine a frequency resource association between one or more PTRS ports and one or more DMRS ports based on port association rules and one or more indicated SRS resources from the first SRS resource set, the second SRS resource set, or both. In some cases, each PTRS port may be associated with the first SRS resource set and the second SRS resource set (e.g., transmitted in an SFN manner), and the maximum number of PTRS ports for UE115 is greater than 1.

[0109] In some cases, the port association rules indicate that the port sharing association between the DMRS port and the PTRS port index, as shown in the TPMI 405 (e.g., the TPMI matrix), is common across multiple TPMI 405s associated with one or more SFN uplink messages. That is, the first TPMI 405 associated with the first SRS resource set and the second TPMI 405 associated with the second SRS resource set may both indicate that the first set of DMRS ports shares a first PTRS port (e.g., PTRS port 0) corresponding to layer 410 transmitted by the first port 415 and the third port 415 (e.g., PUSCH ports 1000 and 1002), and the second set of DMRS ports shares a second PTRS port (e.g., PTRS port 1) corresponding to layer 410 transmitted by the second port 415 and the fourth port 415 (PUSCH ports 1001 and 1003). In such cases, the UE 115 may determine the number of PTRS ports and the frequency resource association based on the first TPMI 405 or the second TPMI 405.

[0110] Additionally or alternatively, UE115 may determine a frequency resource association between one or more DMRS ports and one or more PTRS ports based on the selection of a first TPMI 405 such as TPMI 405-a or a second TPMI 405 such as TPMI 405-b. That is, UE115 may determine the number of PTRS ports and the frequency resource association based on the selected TPMI 405 from TPMI 405-a or TPMI 405-b (e.g., according to the port association field within the selected TPMI 405). In some cases, UE115 may select a TPMI 405 based on the lowest SRS resource set identifier associated with the TPMI 405. That is, UE115 may select TPMI 405-a based on the SRS resource set identifier associated with TPMI 405-a being smaller than the SRS resource set identifier associated with TPMI 405-b. For example, as shown in FIG. 4A, TPMI 405-a (e.g., non-coherent) associated with a first SRS resource set and a first SRS resource set identifier, and TPMI 405-b (e.g., partially coherent) associated with a second SRS resource set and a second SRS resource set identifier may each be associated with four ports 415 of an uplink (e.g., PUSCH) port 415 including port 415-a (e.g., PUSCH port 1000), port 415-b (e.g., PUSCH port 1001), port 415-c (e.g., PUSCH port 1002), and port 415-d (e.g., PUSCH port 1003). Additionally, TPMI 405-a and TPMI 405-b may each be associated with three layers 410 including layer 410-a (e.g., the first layer), layer 410-b (e.g., the second layer), and layer 410-c (e.g., the third layer) (e.g., corresponding to three DMRS ports).Based on TPMI405-a, the first DMRS port corresponding to layer 410-a and the third DMRS port corresponding to layer 410-c may be associated with (may share) the first PTRS port (e.g., PTRS port 0), and the second DMRS port corresponding to layer 410-b may be associated with the second PTRS port (e.g., PTRS port 1). Based on TPMI405-b, the first DMRS port may be associated with the first PTRS port, and the second and third DMRS ports may be associated with the second PTRS port. Therefore, the port association for TPMI405-a may be different from (e.g., not common with) the port association for TPMI405-a. Therefore, UE115 may determine the number of PTRS ports and the frequency resource association based on TPMI405-a based on the fact that the first SRS resource set identifier is smaller than the second SRS resource set identifier.

[0111] In some cases, the UE 115 may select the TPMI 405 based on the number of PTRS ports obtained from the TPMI 405. For example, as shown in FIG. 4B, the TPMI 405-c (e.g., non-coherent) associated with the first SRS resource set, and the TPMI 405-d (e.g., partially coherent) associated with the second SRS resource set may each be associated with four ports 415 of the uplink (e.g., PUSCH) port 415 including the port 415-a, the port 415-b, the port 415-c, and the port 415-d. In addition, the TPMI 405-c and the TPMI 405-d may each be associated with two layers 410 including the layer 410-a and the layer 410-b (e.g., corresponding to two DMRS ports). Based on the TPMI 405-c, the first DMRS port corresponding to the layer 410-a may be associated with (e.g., share) the first PTRS port (e.g., PTRS port 0), and the second DMRS port corresponding to the layer 410-b may be associated with (e.g., share) the second PTRS port (e.g., PTRS port 1). Based on the TPMI 405-d, the first DMRS port and the second DMRS port may be associated with the first PTRS port. Therefore, the port association for the TPMI 405-c may be different from the port association for the TPMI 405-d. Therefore, the UE 115 may determine the number of PTRS ports and the frequency resource association based on the number of PTRS ports obtained from the TPMI 405-c and the number of PTRS ports obtained from the TPMI 405-d. In some cases, the UE 115 may determine the number of PTRS ports and the frequency resource association based on the TPMI 405-c based on the fact that the number of PTRS ports obtained from the TPMI 405-c (e.g., two PTRS ports) is greater than the number of PTRS ports obtained from the TPMI 405-d (e.g., one PTRS port).Alternatively, based on the fact that the number of PTRS ports obtained from TPMI405-d is smaller than the number of PTRS ports obtained from TPMI405-c, UE115 may determine the number of PTRS ports and the frequency resource association based on TPMI405-d.

[0112] In some cases, UE115 may select TPMI405 based on a codebook subset associated with TPMI405. That is, UE115 may select TPMI405 based on the fact that TPMI405 is associated with a codebook subset indicating a partially coherent TPMI405 or a non-coherent TPMI405. In some cases, UE115 may select TPMI405 based on the number of ports 415 associated with TPMI405. That is, UE115 can select the TPMI405 from among the set of TPMI405s associated with the maximum or minimum number of ports 415 (e.g., the number of rows in the TPMI405 matrix).

[0113] FIG. 5 shows an example of a process flow 500 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. In some examples, process flow 500 may implement or may be implemented by aspects of wireless communication system 100, wireless communication system 200, resource set configuration 300, and TPMI set 400. For example, process flow 500 may include one or more network entities 105 (e.g., network entity 105-c and network entity 105-d) and one or more UEs 115 (e.g., UE 115-b), and these network entities and UEs may be examples of the corresponding devices described with reference to FIG. 1. In the example of FIG. 5, network entity 105a may be an example of CU 160, DU 165, RU 170, base station 140, IAB node 104, or one or more other network nodes as described with reference to FIG. 1. For example, UE 115-b may determine a frequency resource association based on port association rules and an indication of one or more SRS resources.

[0114] At 505, UE 115-b may receive first control signaling from network entity 105, such as network entity 105-d, that schedules transmission of SRS signals from a plurality of SRS resource sets including at least a first SRS resource set and a second SRS resource set. In some cases, the maximum number of PTRS ports for UE 115-b may be 1 (e.g., limited to 1). In some other cases, the maximum number of PTRS ports for UE 115-b may be greater than 1. Additionally or alternatively, the SFN uplink message may be a CB-based message or an NCB-based message.

[0115] At 510, UE 115-b may receive, from a network entity 105 such as network entity 105-d, second control signaling that includes an indication of one or more SRS resources from a plurality of SRS resource sets and schedules transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources. Each DMRS port of a set of DMRS ports associated with the one or more SFN uplink messages is transmitted from a respective set of antenna panels of UE 115-b. In some cases, the second control signaling may include an indication of a value corresponding to one of the DMRS ports of the set of DMRS ports.

[0116] At 515, UE 115-b may determine a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of DMRS ports based on port association rules and an indication of one or more SRS resources.

[0117] In some cases, the port association rules may indicate that matching SRS resource indices of a first SRS resource set and a second SRS resource set have the same PTRS port index. In such cases, UE 115-b may determine a frequency resource association between one or more DMRS ports and one or more PTRS ports based on one or more SRS resources from the first SRS resource set or the second SRS resource set.

[0118] In some cases, UE 115-b may determine that the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on one or more indicated SRS resources from either a first SRS resource set or a second SRS resource set having the lowest SRS resource set identifier.

[0119] In some cases, the indication of one or more SRS resources from multiple SRS resource sets includes a first indication of one or more SRS resources from a first SRS resource set that gives a first quantity of PTRS ports and a second indication of one or more SRS resources from a second SRS resource set that gives a second quantity of PTRS ports. In such cases, UE115-b may determine the frequency resource association between one or more DMRS ports and one or more PTRS ports based on the first quantity of PTRS ports, the second quantity of PTRS ports, or both. In some cases, UE115-b may determine that the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on either one or more indicated SRS resources from the first SRS resource set or one or more indicated SRS resources from the second SRS resource set that gives a greater quantity of PTRS ports. In some cases, UE115-b may determine that the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on either one or more indicated SRS resources from the first SRS resource set or one or more indicated SRS resources from the second SRS resource set that gives a smaller quantity of PTRS ports

[0120] In some cases, the port association rule may indicate that the shared association between the DMRS port and the PTRS port index as shown in the TPMI is common across a set of TPMIs associated with one or more SFN uplink messages. In such cases, UE115-b may determine the frequency resource association between one or more DMRS ports and one or more PTRS ports based on a first TPMI associated with the first SRS resource set or a second TPMI associated with the second SRS resource set

[0121] In some cases, the indication of one or more SRS resources from multiple SRS resource sets includes a first indication of a first TPMI and a second indication of a second TPMI. In such cases, UE115-b may determine the frequency resource association between one or more DMRS ports and one or more PTRS ports based on the selection of the first TPMI or the second TPMI according to the TPMI selection criterion. In some examples, the TPMI selection criterion may be based on the lowest SRS resource set identifier associated with either the first TPMI or the second TPMI. In some examples, the TPMI selection criterion may be based on the number of PTRS ports obtained from the first TPMI or the second TPMI. In some examples, the TPMI selection criterion may be based on the codebook subset associated with the first TPMI and the second TPMI, where the codebook subset indicates a partial coherent TPMI or a non-coherent TPMI. In some examples, the TPMI selection criterion may be based on the number of uplink (e.g., PUSCH) ports associated with the first TPMI and the second TPMI.

[0122] In some cases, UE115-b may determine the frequency resource association between one or more DMRS ports and one of the one or more PTRS ports based on the value indicated in the second control signaling and a table indicating the association between a single PTRS port and a set of DMRS ports.

[0123] In some cases, the port association rule may indicate that a first set of one or more PTRS ports is associated with a first SRS resource set and a second set of one or more PTRS ports is associated with the first SRS resource set, where the first set of one or more PTRS ports is different from the second set of one or more PTRS ports.

[0124] In some cases, UE115-b may determine a first quantity of PTRS ports associated with a first SRS resource set based on an indication of one or more SRS resources, and may determine a second quantity of PTRS ports associated with a second SRS resource set based on the indication of one or more SRS resources.

[0125] In some cases, the indication of one or more SRS resources may include a first bit indicating a first PTRS port index and a second bit indicating a second PTRS port index. In such a case, UE115-b may determine that the first PTRS port index is associated with the first SRS resource set based on the first bit, and that the second PTRS port index is associated with the second SRS resource set based on the second bit.

[0126] In some cases, the indication of one or more SRS resources includes a first set of bits indicating a first set of one or more PTRS port indexes and a second set of bits indicating a second set of one or more PTRS port indexes. In such a case, UE115-b may determine, based on the first set of bits, that each PTRS index of the first set of one or more PTRS port indexes is associated with a respective DMRS port, where the first set of bits is associated with the first SRS resource set. Additionally, UE115-b may determine, based on the second set of bits, that each PTRS index of the second set of one or more PTRS port indexes is associated with a respective DMRS port, where the second set of bits is associated with the second SRS resource set.

[0127] At 520, UE115-b may transmit one or more SFN uplink messages based on frequency resource association to network entity 105-c and network entity 105-d.

[0128] FIG. 6 shows a block diagram 600 of a device 605 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The device 605 may be an example of an aspect of the 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).

[0129] The receiver 610 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to reference signal port association determination for an SFN uplink). The information may be passed to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.

[0130] 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, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to reference signal port association determination for an SFN uplink). In some examples, the transmitter 615 may be co-located with the receiver 610 within a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.

[0131] The communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be examples of means for implementing various aspects of the reference signal port association determination for an SFN uplink as described herein. For example, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may support a method for implementing one or more of the functions described herein.

[0132] In some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, a microcontroller, discrete gates or transistor logic, discrete hardware components, or any combination thereof configured as means for performing the functions described in this disclosure or otherwise supporting those means. In some examples, a processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by the processor executing instructions stored in the memory).

[0133] 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). When implemented in code executed by a processor, the functions of the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or any combination of these or other programmable logic devices configured as means for performing the functions described in this disclosure or otherwise supporting those means.

[0134] In some examples, communication manager 620 may be configured to use or otherwise cooperate with receiver 610, transmitter 615, or both to perform various operations (e.g., receive, obtain, monitor, output, transmit). For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or be integrated in combination with receiver 610, transmitter 615, or both to obtain information, output information, or perform various other operations described herein.

[0135] Communication manager 620 may support wireless communication in a UE according to the examples disclosed herein. For example, communication manager 620 may be configured as means for receiving first control signaling that schedules transmission of SRS from a set of multiple SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support such means in other ways. Communication manager 620 may be configured as means for receiving second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, where each DMRS port of a set of multiple DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of multiple distinct antenna panels of the UE. Communication manager 620 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of a set of multiple DMRS ports based on port association rules and an indication of one or more SRS resources, or may support such means in other ways. Communication manager 620 may be configured as means for transmitting one or more SFN uplink messages based on the frequency resource association, or may support such means in other ways.

[0136] By including or configuring a communication manager 620 in accordance with the examples described herein, a device 605 (e.g., a processor that controls or is otherwise coupled to a receiver 610, a transmitter 615, a communication manager 620, or a combination thereof) may support techniques for determining reference signal port associations for a single frequency network (SFN) uplink, which may result in, among other advantages, reduced processing, reduced power consumption, and more efficient use of communication resources.

[0137] FIG. 7 shows a block diagram 700 of a device 705 that supports determining reference signal port associations for an SFN uplink, in accordance with one or more aspects of the present disclosure. Device 705 may be an example of an aspect of device 605 or UE 115 described herein. Device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. Device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0138] The receiver 710 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to determining reference signal port associations for an SFN uplink). The information may be passed to other components of device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.

[0139] 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, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to reference signal port association determination for SFN uplink). In some examples, the transmitter 715 may be co-located with the receiver 710 within a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.

[0140] The device 705, or its various components, may be an example of means for implementing various aspects of reference signal port association determination for SFN uplink as described herein. For example, the communication manager 720 may include a resource set component 725, an SFN component 730, a port association component 735, or any combination thereof. The communication manager 720 may be an example of the aspects of the communication manager 620 described herein. In some examples, the communication manager 720, or its various components, may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using the receiver 710, the transmitter 715, or both, or in cooperation with them in other ways. For example, the communication manager 720 may receive information from the receiver 710, transmit information to the transmitter 715, or be integrated with the receiver 710, the transmitter 715, or both in combination to obtain information, output information, or perform various other operations described herein.

[0141] The communication manager 720 may support wireless communication in a UE according to the examples disclosed herein. The resource set component 725 may be configured as means for receiving first control signaling that schedules the transmission of SRS from a set of multiple SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support that means in another way. The SFN component 730 may be configured as means for receiving second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, or may support that means in another way, where each DMRS port of a set of multiple DMRS ports associated with one or more SFN uplink messages is transmitted from a set of multiple distinct antenna panels of the UE. The port association component 735 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of a set of multiple DMRS ports based on a port association rule and an indication of one or more SRS resources, or may support that means in another way. The SFN component 730 may be configured as means for transmitting one or more SFN uplink messages based on the frequency resource association, or may support that means in another way.

[0142] FIG. 8 shows a block diagram 800 of a communication manager 820 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The communication manager 820 may be an example of the communication manager 620, the communication manager 720, or both, as described herein. The communication manager 820, or its various components, may be an example of means for implementing various aspects of the reference signal port association determination for the SFN uplink described herein. For example, the communication manager 820 may include a resource set component 825, an SFN component 830, a port association component 835, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0143] The communication manager 820 may support wireless communication in a UE according to the examples disclosed herein. The resource set component 825 may be configured as means for receiving first control signaling that schedules the transmission of SRS from a set of multiple SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support such means in other ways. The SFN component 830 may be configured as means for receiving second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, or may support such means in other ways, where each DMRS port of a set of multiple DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of multiple distinct antenna panels of the UE. The port association component 835 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of a set of multiple DMRS ports based on a port association rule and an indication of one or more SRS resources, or may support such means in other ways. In some examples, the SFN component 830 may be configured as means for transmitting one or more SFN uplink messages based on the frequency resource association, or may support such means in other ways.

[0144] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are non-codebook-based messages. In some examples, port association rules indicate that matching SRS resource indices of a first SRS resource set and a second SRS resource set have the same PTRS port index. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on one or more SRS resources from a first SRS resource set or from a second SRS resource set.

[0145] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are non-codebook-based messages. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on the fact that one or more indicated SRS resources from either a first SRS resource set or a second SRS resource set have the lowest SRS resource set identifier.

[0146] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are non-codebook-based messages. In some examples, the indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of one or more SRS resources from a first SRS resource set that gives a first quantity of PTRS ports and a second indication of one or more SRS resources from a second SRS resource set that gives a second quantity of PTRS ports. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on the first quantity of PTRS ports, the second quantity of PTRS ports, or both.

[0147] In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on one or more indicated SRS resources from a first SRS resource set or one or more indicated SRS resources from a second SRS resource set that provide a greater quantity of PTRS ports.

[0148] In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on one or more indicated SRS resources from a first SRS resource set or one or more indicated SRS resources from a second SRS resource set that provide a smaller quantity of PTRS ports.

[0149] In some examples, the maximum quantity of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are codebook-based messages. In some examples, the port association rule indicates that the sharing association between the DMRS port and the PTRS port index as shown in the transmission precoding matrix is common across a set of multiple transmission precoding matrices associated with one or more SFN uplink messages. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is performed based on a first transmission precoding matrix associated with a first SRS resource set, or is performed from a second transmission precoding matrix associated with a second SRS resource set.

[0150] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are codebook-based messages. In some examples, an indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of a first transmission precoding matrix and a second indication of a second transmission precoding matrix. In some examples, determining a frequency resource association between one or more DMRS ports and one or more PTRS ports is based on a selection of a first transmission precoding matrix or a second transmission precoding matrix based on transmission precoding matrix selection criteria.

[0151] In some examples, the transmission precoding matrix selection criteria are based on the lowest SRS resource set identifier associated with either the first transmission precoding matrix or the second transmission precoding matrix.

[0152] In some examples, the transmission precoding matrix selection criteria are based on the number of PTRS ports obtained from the first transmission precoding matrix or the second transmission precoding matrix.

[0153] In some examples, the transmission precoding matrix selection criteria are based on a codebook subset associated with the first transmission precoding matrix and the second transmission precoding matrix. In some examples, the codebook subset indicates a partially coherent transmission precoding matrix or a non-coherent transmission precoding matrix.

[0154] In some examples, the transmission precoding matrix selection criteria are based on the number of physical uplink shared channel ports associated with the first transmission precoding matrix and the second transmission precoding matrix.

[0155] In some examples, to support receiving a second control signaling, the port association component 835 may be configured as means for receiving an indication of a value corresponding to one DMRS port of a set of multiple DMRS ports, or may support that means in another way, where determining a frequency resource association between one or more DMRS ports and one PTRS port of one or more PTRS ports is based on this value and a table indicating an association between a single PTRS port and a set of multiple DMRS ports.

[0156] In some examples, the port association rules indicate that a first set of one or more PTRS ports is associated with a first SRS resource set, and a second set of one or more PTRS ports is associated with the first SRS resource set. In some examples, the first set of one or more PTRS ports is different from the second set of one or more PTRS ports.

[0157] In some examples, to support determining a frequency resource association between one or more DMRS ports and one or more PTRS ports, the port association component 835 may be configured as means for determining a first quantity of PTRS ports associated with a first SRS resource set based on an indication of one or more SRS resources, or may support that means in another way. In some examples, to support determining a frequency resource association between one or more DMRS ports and one or more PTRS ports, the port association component 835 may be configured as means for determining a second quantity of PTRS ports associated with a second SRS resource set based on an indication of one or more SRS resources, or may support that means in another way.

[0158] In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports, the port association component 835 may be configured as means for determining, based on a first bit, that a first PTRS port index is associated with a first SRS resource set, or may support that means in some other way. In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports, the port association component 835 may be configured as means for determining, based on a second bit, that a second PTRS port index is associated with a second SRS resource set, or may support that means in some other way.

[0159] In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports, the port association component 835 may be configured as means for determining, based on a first set of bits, that each PTRS index of a first set of one or more PTRS port indexes is associated with a respective DMRS port, or may support that means in some other way, where the first set of bits is associated with a first SRS resource set. In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports, the port association component 835 may be configured as means for determining, based on a second set of bits, that each PTRS index of a second set of one or more PTRS port indexes is associated with a respective DMRS port, or may support that means in some other way, where the second set of bits is associated with a second SRS resource set.

[0160] FIG. 9 shows a diagram of a system 900 that includes a device 905 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The device 905 may be an example of, or include, a device 605, a device 705, or a UE 115 as described herein. The device 905 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 905 may include components for bi-directional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, code 935, and a processor 940. These components may communicate electronically via one or more buses (e.g., bus 945), or may be otherwise (e.g., operably, communicatively, functionally, electronically, electrically) coupled.

[0161] The I / O controller 910 may manage the input and output signals of the device 905. The I / O controller 910 may also manage peripheral devices that are not integrated with the device 905. In some cases, the I / O controller 910 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 910 may utilize an operating system such as iOS (registered trademark), ANDROID (registered trademark), MS-DOS (registered trademark), MS-WINDOWS (registered trademark), OS / 2 (registered trademark), UNIX (registered trademark), LINUX (registered trademark), or another known operating system. Additionally or alternatively, the I / O controller 910 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the I / O controller 910 may be implemented as part of a processor such as the processor 940. In some cases, a user may interact with the device 905 via the I / O controller 910 or via hardware components controlled by the I / O controller 910.

[0162] In some cases, the device 905 may include a single antenna 925. However, in some other cases, the device 905 may have two or more antennas 925 that may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 915 may communicate bidirectionally via one or more of the antennas 925, wired links, or wireless links described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 915 may also include a modem for modulating packets and providing the modulated packets to one or more antennas 925 for transmission and for demodulating 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 the transmitter 615, transmitter 715, receiver 610, receiver 710, or any combination thereof or components thereof described herein.

[0163] The memory 930 may include a random access memory (RAM) and a read-only memory (ROM). The memory 930 may store computer-readable computer-executable code 935 that, when executed by the processor 940, causes the device 905 to perform various functions described herein. The code 935 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some cases, the code 935 may not be directly executable by the processor 940 but may cause a computer to perform the functions described herein (e.g., when compiled or executed). In some cases, the memory 930 may include, among other things, a basic input / output system (BIOS) that may control basic hardware or software operations, such as interactions with peripheral components or peripheral devices.

[0164] Processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, DSP, CPU, microcontroller, ASIC, FPGA, programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 940 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks that support reference signal port association determination for an SFN uplink). For example, device 905 or components of device 905 may include processor 940 and memory 930 coupled to or coupled with processor 940, and processor 940 and memory 930 are configured to perform the various functions described herein.

[0165] The communication manager 920 may support wireless communication in a UE according to the examples disclosed herein. For example, the communication manager 920 may be configured as means for receiving first control signaling that schedules the transmission of SRS from a set of multiple SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support such means in other ways. The communication manager 920 may be configured as means for receiving second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, where each DMRS port of a set of multiple DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of multiple distinct antenna panels of the UE. The communication manager 920 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports based on a port association rule and an indication of one or more SRS resources, or may support such means in other ways. The communication manager 920 may be configured as means for transmitting one or more SFN uplink messages based on the frequency resource association, or may support such means in other ways.

[0166] By including or configuring the communication manager 920 according to the examples described herein, the device 905 may support techniques for determining reference signal port associations for single frequency network SFN uplinks, thereby providing, among other advantages, improved communication reliability, reduced latency, improved user experience related to reduced processing, reduced power consumption, more efficient use of communication resources, improved cooperation between devices, longer battery life, and improved utilization of processing capabilities.

[0167] In some examples, communication manager 920 may be configured to use transceiver 915, one or more antennas 925, or any combination thereof, or otherwise cooperate with them, to perform various operations (e.g., receiving, monitoring, transmitting). Although communication manager 920 is shown as a separate component, in some examples, one or more functions described with reference to communication manager 920 may be supported or performed by processor 940, memory 930, code 935, or any combination thereof. For example, code 935 may include instructions executable by processor 940 to cause device 905 to perform various aspects of reference signal port association determination for the SFN uplink described herein, or processor 940 and memory 930 may be configured to perform or support such operations in other ways.

[0168] FIG. 10 shows a block diagram 1000 of a device 1005 that supports reference signal port association determination for an SFN uplink, according to one or more aspects of the present disclosure. Device 1005 may be an example of an aspect of network entity 105 as described herein. Device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. Device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0169] The receiver 1010 may provide means for acquiring (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with the protocol stack). The information may be passed to other components of the device 1005. In some examples, the receiver 1010 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, the receiver 1010 may support acquiring information by receiving signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof.

[0170] The transmitter 1015 may provide means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1005. For example, the transmitter 1015 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with the protocol stack). In some examples, the transmitter 1015 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, the transmitter 1015 may support outputting information by transmitting signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1015 and the receiver 1010 may be co-located within a transceiver that may include or be coupled to a modem.

[0171] The communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or various components thereof may be examples of means for implementing various aspects of the reference signal port association determination for the SFN uplink described herein. For example, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may support a method for implementing one or more of the functions described herein.

[0172] In some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a DSP, an ASIC, an FPGA, or other programmable logic device, a microcontroller, discrete gates or transistor logic, discrete hardware components, or any combination thereof configured as means for implementing the functions described in this disclosure or supporting those means in other ways. In some examples, a processor and memory coupled to the processor may be configured to implement one or more of the functions described herein (e.g., by the processor executing instructions stored in the memory).

[0173] 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). When 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 implemented by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices configured as means for implementing the functions described in this disclosure or supporting those means in other ways.

[0174] In some examples, the communication manager 1020 may be configured to use the receiver 1010, the transmitter 1015, or both, or to cooperate with them in other ways, to perform various operations (e.g., receive, obtain, monitor, output, transmit). For example, the communication manager 1020 may receive information from the receiver 1010, transmit information to the transmitter 1015, or be integrated with the receiver 1010, the transmitter 1015, or both in combination to obtain information, output information, or perform various other operations described herein.

[0175] The communication manager 1020 may support wireless communication in a network entity according to the examples disclosed herein. For example, the communication manager 1020 may be configured as means for outputting first control signaling for scheduling the transmission of SRS from a set of multiple SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support that means in other ways. The communication manager 1020 may be configured as means for outputting second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, or may support that means in other ways. The communication manager 1020 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports from a set of multiple DMRS ports based on port association rules and an indication of one or more SRS resources, or may support that means in other ways. The communication manager 1020 may be configured as means for receiving one or more SFN uplink messages based on port association rules, or may support that means in other ways.

[0176] By including or configuring a communication manager 1020 according to the examples described herein, a device 1005 (e.g., a processor that controls or is otherwise coupled to a receiver 1010, a transmitter 1015, a communication manager 1020, or a combination thereof) may support techniques for determining reference signal port associations for a single frequency network SFN uplink, thereby providing, among other advantages, reduced processing, reduced power consumption, and more efficient utilization of communication resources.

[0177] FIG. 11 shows a block diagram 1100 of a device 1105 that supports determining reference signal port associations for an SFN uplink, according to one or more aspects of the present disclosure. Device 1105 may be an example of an aspect of device 1005 or network entity 105 as described herein. Device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. Device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0178] The receiver 1110 may provide means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with the protocol stack). The information may be passed to other components of device 1105. In some examples, the receiver 1110 may support obtaining information by receiving signals via one or more antennas. Additionally or alternatively, the receiver 1110 may support obtaining information by receiving signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof.

[0179] The transmitter 1115 may provide means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1105. For example, the transmitter 1115 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with the protocol stack). In some examples, the transmitter 1115 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, the transmitter 1115 may support outputting information by transmitting signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1115 and the receiver 1110 may be co-located within a transceiver that includes or is coupled to a modem.

[0180] Device 1105, or various components thereof, may be an example of means for implementing various aspects of reference signal port association determination for SFN uplink as described herein. For example, communication manager 1120 may include resource set component 1125, SFN component 1130, port association component 1135, or any combination thereof. Communication manager 1120 may be an example of the aspects of communication manager 1020 described herein. In some examples, communication manager 1120, or various components thereof, may be configured to use receiver 1110, transmitter 1115, or both, or cooperate with them in other ways, to perform various operations (e.g., receive, obtain, monitor, output, transmit). For example, communication manager 1120 may receive information from receiver 1110, transmit information to transmitter 1115, or be integrated in combination with receiver 1110, transmitter 1115, or both, to obtain information, output information, or perform various other operations described herein.

[0181] The communication manager 1120 may support wireless communication in a network entity according to the examples disclosed herein. The resource set component 1125 may be configured as means for outputting first control signaling for scheduling the transmission of SRS from a set of a plurality of SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support such means in other ways. The SFN component 1130 may be configured as means for outputting second control signaling that includes an indication of one or more SRS resources from a set of a plurality of SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, or may support such means in other ways. The port association component 1135 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of a set of a plurality of DMRS ports based on a port association rule and an indication of one or more SRS resources, or may support such means in other ways. The SFN component 1130 may be configured as means for receiving one or more SFN uplink messages based on a port association rule, or may support such means in other ways.

[0182] FIG. 12 shows a block diagram 1200 of a communication manager 1220 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The communication manager 1220 may be an example of the communication manager 1020, the communication manager 1120, or aspects of both, as described herein. The communication manager 1220, or its various components, may be an example of means for implementing various aspects of the reference signal port association determination for the SFN uplink described herein. For example, the communication manager 1220 may include a resource set component 1225, an SFN component 1230, a port association component 1235, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses), which may include communication within a protocol layer of a protocol stack, communication associated with a logical channel of a protocol stack (e.g., communication between protocol layers of a protocol stack, communication within a device, component, or virtualized component associated with the network entity 105, communication between devices, components, or virtualized components associated with the network entity 105), or any combination thereof.

[0183] The communication manager 1220 may support wireless communication in a network entity according to the examples disclosed herein. The resource set component 1225 may be configured as means for outputting first control signaling for scheduling the transmission of SRS from a set of a plurality of SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support such means in other ways. The SFN component 1230 may be configured as means for outputting second control signaling that includes an indication of one or more SRS resources from a set of a plurality of SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, or may support such means in other ways. The port association component 1235 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of a set of a plurality of DMRS ports based on a port association rule and an indication of one or more SRS resources, or may support such means in other ways. In some examples, the SFN component 1230 may be configured as means for receiving one or more SFN uplink messages based on a port association rule, or may support such means in other ways.

[0184] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are non-codebook-based messages. In some examples, the port association rule indicates that matching SRS resource indexes of the first SRS resource set and the second SRS resource set have the same PTRS port index.

[0185] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are non-codebook-based messages. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on one or more indicated SRS resources from either a first SRS resource set or a second SRS resource set having a lowest SRS resource set identifier.

[0186] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are non-codebook-based messages. In some examples, an indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of one or more SRS resources from a first SRS resource set that gives a first quantity of PTRS ports and a second indication of one or more SRS resources from a second SRS resource set that gives a second quantity of PTRS ports. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on the first quantity of PTRS ports, the second quantity of PTRS ports, or both.

[0187] In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on either one or more indicated SRS resources from a first SRS resource set or one or more indicated SRS resources from a second SRS resource set that gives a greater quantity of PTRS ports.

[0188] In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on one or more indicated SRS resources from a first SRS resource set, or one or more indicated SRS resources from a second SRS resource set providing a smaller number of PTRS ports.

[0189] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are codebook-based messages. In some examples, the port association rule indicates that the shared association between the DMRS port and the PTRS port index as shown in the transmission precoding matrix is common across a set of multiple transmission precoding matrices associated with one or more SFN uplink messages. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is performed based on a first transmission precoding matrix associated with a first SRS resource set, or is performed from a second transmission precoding matrix associated with a second SRS resource set.

[0190] In some examples, the maximum number of PTRS ports for a UE is greater than 1. In some examples, one or more SFN uplink messages are codebook-based messages. In some examples, the indication of one or more SRS resources from a set of multiple SRS resource sets includes a first indication of a first transmission precoding matrix and a second indication of a second transmission precoding matrix. In some examples, determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is based on the selection of a first transmission precoding matrix or a second transmission precoding matrix based on transmission precoding matrix selection criteria.

[0191] In some examples, the transmit precoding matrix selection criterion is based on the lowest SRS resource set identifier associated with either the first transmit precoding matrix or the second transmit precoding matrix.

[0192] In some examples, the transmit precoding matrix selection criterion is based on the number of PTRS ports obtained from the first transmit precoding matrix or the second transmit precoding matrix.

[0193] In some examples, the transmit precoding matrix selection criterion is based on a codebook subset associated with the first transmit precoding matrix and the second transmit precoding matrix. In some examples, the codebook subset indicates a partial coherent transmit precoding matrix or a non - coherent transmit precoding matrix.

[0194] In some examples, the transmit precoding matrix selection criterion is based on the number of physical uplink shared channel ports associated with the first transmit precoding matrix and the second transmit precoding matrix.

[0195] In some examples, to support outputting the second control signaling, the port association component 1235 can be configured as means for outputting an indication of a value corresponding to one of the DMRS ports of a set of a plurality of DMRS ports associated with the UE, or can support that means in another way, where determining the frequency resource association between one or more DMRS ports and one of the one or more PTRS ports is based on this value and a table indicating the association between a single PTRS port and the set of a plurality of DMRS ports.

[0196] In some examples, the port association rules indicate that a first set of one or more PTRS ports is associated with a first SRS resource set, and a second set of one or more PTRS ports is associated with the first SRS resource set. In some examples, the first set of one or more PTRS ports is different from the second set of one or more PTRS ports.

[0197] In some examples, to support determining a frequency resource association between one or more DMRS ports and one or more PTRS ports, the port association component 1235 may be configured as means for determining a first quantity of PTRS ports associated with a first SRS resource set based on an indication of one or more SRS resources, or may support that means in other ways. In some examples, to support determining a frequency resource association between one or more DMRS ports and one or more PTRS ports, the port association component 1235 may be configured as means for determining a second quantity of PTRS ports associated with a second SRS resource set based on an indication of one or more SRS resources, or may support that means in other ways.

[0198] In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports, the port association component 1235 may be configured as means for determining, based on a first bit, that a first PTRS port index is associated with a first SRS resource set, or may support that means in some other way. In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports, the port association component 1235 may be configured as means for determining, based on a second bit, that a second PTRS port index is associated with a second SRS resource set, or may support that means in some other way.

[0199] In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports, the port association component 1235 may be configured as means for determining, based on a first set of bits, that each PTRS index of a first set of one or more PTRS port indexes is associated with a respective DMRS port, or may support that means in some other way, where the first set of bits is associated with a first SRS resource set. In some examples, to support determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports of a set of PTRS ports and DMRS ports, the port association component 1235 may be configured as means for determining, based on a second set of bits, that each PTRS index of a second set of one or more PTRS port indexes is associated with a respective DMRS port, or may support that means in some other way, where the second set of bits is associated with a second SRS resource set.

[0200] FIG. 13 shows a diagram of a system 1300 that includes a device 1305 that supports reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The device 1305 can be an example of, or can include, a device 1005, a device 1105, or a network entity 105 as described herein. The device 1305 can communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, which can include communication via one or more wired interfaces, communication via one or more wireless interfaces, or communication via a combination thereof. The device 1305 can include components that support outputting and obtaining communication, such as a communication manager 1320, a transceiver 1310, an antenna 1315, a memory 1325, a code 1330, and a processor 1335. These components may communicate electronically via one or more buses (e.g., bus 1340), or may be coupled in other ways (e.g., operably, communicably, functionally, electronically, electrically).

[0201] As described herein, transceiver 1310 may support bi-directional communication via a wired link, a wireless link, or both. In some examples, transceiver 1310 may include a wired transceiver and may communicate bi-directionally with another wired transceiver. Additionally or alternatively, in some examples, transceiver 1310 may include a wireless transceiver and may communicate bi-directionally with another transceiver. In some examples, device 1305 may include one or more antennas 1315 that may be capable of transmitting or receiving (e.g., simultaneously) wireless transmissions. Transceiver 1310 may also include a modem for modulating signals, providing modulated signals for transmission (e.g., by one or more antennas 1315, by a wired transmitter), receiving modulated signals (e.g., from one or more antennas 1315, from a wired receiver), and demodulating signals. In some implementations, transceiver 1310 may include one or more interfaces coupled to one or more antennas 1315 configured to support various receive or acquisition operations, or one or more interfaces coupled to one or more antennas 1315 configured to support various transmit or output operations, or a combination thereof, etc., one or more interfaces. In some implementations, transceiver 1310 may include, or be configured to couple to, one or more processors or memory components that are operable to perform or support operations based on received or acquired information or signals, or are operable to generate information or other signals for transmission or other output, or any combination thereof.In some implementations, the transceiver 1310, or the transceiver 1310 and one or more antennas 1315, or the transceiver 1310 and one or more antennas 1315 and one or more processors or memory components (e.g., processor 1335, or memory 1325, or both) may be included in a chip or chip assembly installed in the device 1305. The transceiver 1310, or the transceiver 1310 and one or more antennas 1315, or a wired interface may, if applicable, be an example of a transmitter 1015, transmitter 1115, receiver 1010, receiver 1110, or any combination thereof or components thereof as described herein. In some examples, the transceiver may be operable to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, midhaul communication link 162, fronthaul communication link 168).

[0202] The memory 1325 may include a RAM and a ROM. The memory 1325 may store computer-readable computer-executable code 1330 that includes instructions that, when executed by the processor 1335, cause the device 1305 to perform various functions described herein. The code 1330 may be stored on a non-transitory computer-readable medium such as a system memory or another type of memory. In some cases, the code 1330 may not be directly executable by the processor 1335, but may cause a computer to perform the functions described herein (e.g., when compiled or executed). In some cases, the memory 1325 may include a BIOS that can control basic hardware operations or software operations, particularly interactions with peripheral components or peripheral devices.

[0203] Processor 1335 may include an intelligent hardware device (e.g., a general-purpose processor, DSP, ASIC, CPU, FPGA, microcontroller, programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof). In some cases, processor 1335 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 1335. Processor 1335 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1325) to cause the device 1305 to perform various functions (e.g., functions or tasks that support reference signal port association determination for an SFN uplink). For example, device 1305 or a component of device 1305 may include processor 1335 and memory 1325 coupled to processor 1335, and processor 1335 and memory 1325 are configured to perform the various functions described herein. Processor 1335 may be an example of a cloud computing platform (e.g., one or more physical nodes, and support software such as an operating system, virtual machine, or container instance) that can host functions (e.g., by executing code 1330) to perform the functions of device 1305. Processor 1335 may be any suitable one or more processors capable of executing a script or instructions of one or more software programs stored within device 1305 (e.g., within memory 1325). In some implementations, processor 1335 may be a component of a processing system. A processing system may generally refer to a system or series of machines or components that receive an input, process the input, and generate a set of outputs (e.g., that may be passed to other systems or components of device 1305).For example, the processing system of device 1305 may refer to a system including various other components or sub-components of device 1305, such as processor 1335, or transceiver 1310, or communication manager 1320, or other combinations of components of device 1305. The processing system of device 1305 may interface with other components of device 1305 and process information (such as input or signals) received from other components, or may output information to other components. For example, a chip or modem of device 1305 may include an interface for outputting information, or an interface for obtaining information, or both interfaces for the processing system. The interface may be implemented as a first interface configured to output information and a second interface configured to obtain information, or may include those interfaces in other ways. In some implementations, the first interface may refer to an interface between the processing system of the chip or modem and the transmitter, whereby device 1305 may transmit information output from the chip or modem. In some implementations, the second interface may refer to an interface between the processing system of the chip or modem and the receiver, whereby device 1305 may receive information or signal input, and the information may be passed to the processing system. Those skilled in the art will readily recognize that the first interface may also obtain information or signal input, and the second interface may also output information or signal output.

[0204] In some examples, bus 1340 may support communication within a protocol layer of a protocol stack (e.g., within a protocol layer). In some examples, bus 1340 may support communication associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack), which may include communication implemented within components of device 1305, or collocated, or implemented between different components of device 1305 located at different locations (e.g., device 1305 may refer to a system in which one or more of communication manager 1320, transceiver 1310, memory 1325, code 1330, and processor 1335 may be located in one of different components or divided between different components).

[0205] In some examples, communication manager 1320 may manage the manner of communication with core network 130 (e.g., via one or more wired or wireless backhaul links). For example, communication manager 1320 may manage the transfer of data communication for client devices such as one or more UEs 115. In some examples, communication manager 1320 may manage communication with other network entities 105 and may include a controller or scheduler for controlling communication with UE 115 in cooperation with other network entities 105. In some examples, communication manager 1320 may support an X2 interface within LTE / LTE-A wireless communication network technology to provide communication between network entities 105.

[0206] The communication manager 1320 may support wireless communication in a network entity according to the examples disclosed herein. For example, the communication manager 1320 may be configured as means for outputting first control signaling that schedules the transmission of SRS from a set of multiple SRS resource sets, including at least a first SRS resource set and a second SRS resource set, or may support that means in other ways. The communication manager 1320 may be configured as means for outputting second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, or may support that means in other ways. The communication manager 1320 may be configured as means for determining a frequency resource association between one or more PTRS ports and one or more DMRS ports from a set of multiple DMRS ports based on port association rules and an indication of one or more SRS resources, or may support that means in other ways. The communication manager 1320 may be configured as means for receiving one or more SFN uplink messages based on port association rules, or may support that means in other ways.

[0207] By including or configuring the communication manager 1320 according to the examples described herein, the device 1305 may support techniques for reference signal port association determination for single frequency network SFN uplink, thereby resulting in, among other advantages, improved communication reliability, reduced latency, improved user experience related to reduced processing, reduced power consumption, more efficient utilization of communication resources, improved cooperation between devices, longer battery life, and improved utilization of processing capabilities.

[0208] In some examples, the communication manager 1320 may be configured to use the transceivers 1310, one or more antennas 1315 (if applicable), or any combination thereof, or otherwise cooperate with them to perform various operations (e.g., receive, obtain, monitor, output, transmit). Although the communication manager 1320 is shown as a separate component, in some examples, one or more of the functions described with reference to the communication manager 1320 may be supported or implemented by the processor 1335, the memory 1325, the code 1330, the transceiver 1310, or any combination thereof. For example, the code 1330 may include instructions executable by the processor 1335 to cause the device 1305 to perform various aspects of the reference signal port association determination for the SFN uplink described herein, or the processor 1335 and the memory 1325 may be otherwise configured to perform or support such operations.

[0209] FIG. 14 shows a flowchart illustrating a method 1400 for supporting reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The operations of method 1400 may be implemented by a UE or its components as described herein. For example, the operations of method 1400 may be performed by the UE 115 described with reference to FIGS. 1-9. 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 aspects of the described functions.

[0210] At 1405, the method may include receiving first control signaling that schedules the transmission of SRS from a set of multiple SRS resource sets, including at least a first SRS resource set and a second SRS resource set. The operation of 1405 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1405 may be implemented by resource set component 825, as described with reference to FIG. 8.

[0211] At 1410, the method may include receiving second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources, where each DMRS port of a set of multiple DMRS ports associated with the one or more SFN uplink messages is transmitted from a set of multiple distinct antenna panels of the UE. The operation of 1410 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1410 may be implemented by SFN component 830, as described with reference to FIG. 8.

[0212] At 1415, the method may include determining a frequency resource association between one or more PTRS ports and one or more of the DMRS ports of a set of multiple DMRS ports based on port association rules and an indication of one or more SRS resources. The operation of 1415 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1415 may be implemented by port association component 835, as described with reference to FIG. 8.

[0213] At 1420, the method may include transmitting one or more SFN uplink messages based on frequency resource association. The operation of 1420 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1420 may be implemented by the SFN component 830 as described with reference to FIG. 8.

[0214] FIG. 15 shows a flowchart illustrating a method 1500 for supporting reference signal port association determination for an SFN uplink according to one or more aspects of the present disclosure. The operations of method 1500 may be implemented by a network entity or a component thereof as described herein. For example, the operations of method 1500 may be implemented by a network entity as described with reference to FIGS. 1-5 and 10-13. In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may use dedicated hardware to implement aspects of the described functions.

[0215] At 1505, the method may include outputting first control signaling for scheduling the transmission of SRS from a set of multiple SRS resource sets including at least a first resource set and a second resource set. The operation of 1505 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1505 may be implemented by the resource set component 1225 as described with reference to FIG. 12.

[0216] At 1510, the method may include outputting second control signaling that includes an indication of one or more SRS resources from a set of multiple SRS resource sets and schedules the transmission of one or more SFN uplink messages based on the indication of the one or more SRS resources. The operation of 1510 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1510 may be implemented by the SFN component 1230 as described with reference to FIG. 12.

[0217] At 1515, the method may include determining a frequency resource association between one or more PTRS ports and one or more DMRS ports of a set of multiple DMRS ports based on port association rules and an indication of one or more SRS resources. The operation of 1515 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1515 may be implemented by the port association component 1235 as described with reference to FIG. 12.

[0218] At 1520, the method may include receiving one or more SFN uplink messages based on port association rules. The operation of 1520 may be implemented according to the examples disclosed herein. In some examples, aspects of the operation of 1520 may be implemented by the SFN component 1230 as described with reference to FIG. 12.

[0219] The following provides an overview of aspects of the present disclosure.

[0220] Aspect 1: A method for wireless communication in a UE, comprising: receiving first control signaling for scheduling transmission of SRS from a plurality of SRS resource sets including at least a first resource set and a second resource set; receiving second control signaling including an indication of one or more SRS resources from the plurality of SRS resource sets and scheduling transmission of one or more SFN uplink messages at least partially based on the indication of the one or more SRS resources, wherein each DMRS port of a plurality of DMRS ports associated with the one or more SFN uplink messages is transmitted from a plurality of distinct antenna panels of the UE; determining a frequency resource association between one or more PTRS ports and one or more of the plurality of DMRS ports at least partially based on a port association rule and the indication of the one or more SRS resources; and transmitting the one or more SFN uplink messages at least partially based on the frequency resource association.

[0221] Aspect 2: The method of Aspect 1, wherein a maximum number of PTRS ports for the UE is greater than 1, the one or more SFN uplink messages are non-codebook-based messages, the port association rule indicates that matching SRS resource indices of the first SRS resource set and the second SRS resource set have the same PTRS port index, and determining the frequency resource association between the one or more DMRS ports and the one or more PTRS ports is at least partially based on one or more SRS resources from the first SRS resource set or the second SRS resource set.

[0222] Aspect 3: The maximum number of PTRS ports for a UE is greater than 1, one or more SFN uplink messages are non-codebook-based messages, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is at least partially based on one or more indicated SRS resources from either a first SRS resource set or a second SRS resource set having a lowest SRS resource set identifier, the method of Aspect 1.

[0223] Aspect 4: The maximum number of PTRS ports for a UE is greater than 1, one or more SFN uplink messages are non-codebook-based messages, an indication of one or more SRS resources from a plurality of SRS resource sets includes a first indication of one or more SRS resources from a first SRS resource set giving a first quantity of PTRS ports and a second indication of one or more SRS resources from a second SRS resource set giving a second quantity of PTRS ports, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is at least partially based on the first quantity of PTRS ports, the second quantity of PTRS ports, or both, the method of Aspect 1.

[0224] Aspect 5: The method of Aspect 4, wherein determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is at least partially based on either one or more indicated SRS resources from a first SRS resource set or one or more indicated SRS resources from a second SRS resource set giving a greater quantity of PTRS ports.

[0225] Aspect 6: Determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is a method of Aspect 4 or 5 that is at least partially based on either one or more indicated SRS resources from a first SRS resource set or one or more indicated SRS resources from a second SRS resource set giving a smaller number of PTRS ports.

[0226] Aspect 7: The maximum number of PTRS ports for a UE is greater than 1, one or more SFN uplink messages are codebook-based messages, the port association rule indicates that the shared association between DMRS ports and PTRS port indices as shown in the transmission precoding matrix is common across a plurality of transmission precoding matrices associated with one or more SFN uplink messages, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is performed at least partially based on a first transmission precoding matrix associated with a first SRS resource set or is performed from a second transmission precoding matrix associated with a second SRS resource set, the method of Aspect 1.

[0227] Aspect 8: The maximum number of PTRS ports for a UE is greater than 1, one or more SFN uplink messages are codebook-based messages, the indication of one or more SRS resources from a plurality of SRS resource sets includes a first indication of a first transmission precoding matrix and a second indication of a second transmission precoding matrix, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is at least partially based on the selection of a first transmission precoding matrix or a second transmission precoding matrix that is at least partially based on a transmission precoding matrix selection criterion, the method of Aspect 1.

[0228] Aspect 9: The method of Aspect 8, wherein the transmission precoding matrix selection criterion is at least partially based on the lowest SRS resource set identifier associated with either the first transmission precoding matrix or the second transmission precoding matrix.

[0229] Aspect 10: The method of Aspect 8, wherein the transmission precoding matrix selection criterion is at least partially based on the number of PTRS ports obtained from either the first transmission precoding matrix or the second transmission precoding matrix.

[0230] Aspect 11: The method of Aspect 8, wherein the transmission precoding matrix selection criterion is at least partially based on a codebook subset associated with the first transmission precoding matrix and the second transmission precoding matrix, and the codebook subset indicates a partially coherent transmission precoding matrix or a non - coherent transmission precoding matrix.

[0231] Aspect 12: The method of Aspect 8, wherein the transmission precoding matrix selection criterion is at least partially based on the number of physical uplink shared channel ports associated with the first transmission precoding matrix and the second transmission precoding matrix.

[0232] Aspect 13: The maximum number of PTRS ports for a UE is limited to 1, receiving a second control signaling includes receiving an indication of a value corresponding to one of a plurality of DMRS ports, and determining a frequency resource association between one or more DMRS ports and one of one or more PTRS ports is at least partially based on this value and a table indicating the association between a single PTRS port and a plurality of DMRS ports, the method of Aspect 1.

[0233] Aspect 14: The port association rule indicates that a first set of one or more PTRS ports is associated with a first SRS resource set, and a second set of one or more PTRS ports is associated with the first SRS resource set, and the first set of one or more PTRS ports is different from the second set of one or more PTRS ports. The method of Aspect 1.

[0234] Aspect 15: Determining the frequency resource association between one or more DMRS ports and one or more PTRS ports includes determining a first quantity of PTRS ports associated with a first SRS resource set based at least in part on an indication of one or more SRS resources, and determining a second quantity of PTRS ports associated with a second SRS resource set based at least in part on an indication of one or more SRS resources. The method of Aspect 14.

[0235] Aspect 16: The number of transmission layers associated with one or more SFN uplink messages is 2, and the indication of one or more SRS resources includes a first bit indicating a first PTRS port index and a second bit indicating a second PTRS port index. Determining the frequency resource association between one or more PTRS ports and one or more of the plurality of DMRS ports includes determining that the first PTRS port index is associated with a first SRS resource set based at least in part on the first bit, and determining that the second PTRS port index is associated with a second SRS resource set based at least in part on the second bit. The method of Aspect 14 or 15.

[0236] Aspect 17: The number of transmission layers associated with one or more SFN uplink messages is greater than 2, and the indication of one or more SRS resources includes a first set of bits indicating a first set of one or more PTRS port indexes and a second set of bits indicating a second set of one or more PTRS port indexes. Determining the frequency resource association between one or more PTRS ports and one or more of the plurality of DMRS ports includes determining, at least partially based on the first set of bits associated with the first SRS resource set, that each PTRS index of the first set of one or more PTRS port indexes is associated with a respective DMRS port, and determining, at least partially based on the second set of bits associated with the second SRS resource set, that each PTRS index of the second set of one or more PTRS port indexes is associated with a respective DMRS port, in the method of Aspect 14 or 15.

[0237] Aspect 18: A method for wireless communication in a network entity, comprising outputting first control signaling for scheduling the transmission of SRS from a plurality of SRS resource sets, including at least a first resource set and a second resource set; outputting second control signaling including an indication of one or more SRS resources from the plurality of SRS resource sets and scheduling the transmission of one or more SFN uplink messages at least partially based on the indication of the one or more SRS resources; determining a frequency resource association between one or more PTRS ports and one or more of the plurality of DMRS ports at least partially based on a port association rule and the indication of the one or more SRS resources; and receiving one or more SFN uplink messages at least partially based on the port association rule.

[0238] Aspect 19: The method according to aspect 18, wherein the maximum number of PTRS ports for the UE is greater than 1, one or more SFN uplink messages are non-codebook-based messages, and the port association rule indicates that the matching SRS resource indexes of the first SRS resource set and the second SRS resource set have the same PTRS port index.

[0239] Aspect 20: The method according to aspect 18 or 19, wherein the maximum number of PTRS ports for the UE is greater than 1, one or more SFN uplink messages are non-codebook-based messages, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is at least partially based on that one or more indicated SRS resources from either the first SRS resource set or the second SRS resource set have the lowest SRS resource set identifier.

[0240] Aspect 21: The method according to any one of aspects 18 to 20, wherein the maximum number of PTRS ports for the UE is greater than 1, one or more SFN uplink messages are non-codebook-based messages, the indication of one or more SRS resources from a plurality of SRS resource sets includes a first indication of one or more SRS resources from a first SRS resource set that gives a first quantity of PTRS ports and a second indication of one or more SRS resources from a second SRS resource set that gives a second quantity of PTRS ports, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is at least partially based on the first quantity of PTRS ports, the second quantity of PTRS ports, or both.

[0241] Aspect 22: The maximum number of PTRS ports for a UE is greater than 1, one or more SFN uplink messages are codebook-based messages, and the sharing association between DMRS ports and PTRS port indices as indicated in the transmission precoding matrix is common across a plurality of transmission precoding matrices associated with one or more SFN uplink messages, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is performed at least in part based on a first transmission precoding matrix associated with a first SRS resource set or is performed from a second transmission precoding matrix associated with a second SRS resource set, the method according to any of Aspects 18 to 21.

[0242] Aspect 23: The maximum number of PTRS ports for a UE is greater than 1, one or more SFN uplink messages are codebook-based messages, and the indication of one or more SRS resources from a plurality of SRS resource sets includes a first indication of a first transmission precoding matrix and a second indication of a second transmission precoding matrix, and determining the frequency resource association between one or more DMRS ports and one or more PTRS ports is at least in part based on the selection of a first transmission precoding matrix or a second transmission precoding matrix at least in part based on a transmission precoding matrix selection criterion, the method according to any of Aspects 18 to 22.

[0243] Aspect 24: The maximum number of PTRS ports for a UE is limited to 1, and outputting second control signaling includes outputting an indication of a value corresponding to one of a plurality of DMRS ports associated with the UE, and determining a frequency resource association between one or more DMRS ports and one of one or more PTRS ports is at least partially based on this value and a table indicating an association between a single PTRS port and the plurality of DMRS ports, the method according to any of Aspects 18 to 23.

[0244] Aspect 25: A port association rule indicates that a first set of one or more PTRS ports is associated with a first SRS resource set and a second set of one or more PTRS ports is associated with the first SRS resource set, and the first set of one or more PTRS ports is different from the second set of one or more PTRS ports, the method according to any of Aspects 18 to 24.

[0245] Aspect 26: Determining a frequency resource association between one or more DMRS ports and one or more PTRS ports includes determining a first quantity of PTRS ports associated with a first SRS resource set based at least in part on an indication of one or more SRS resources, and determining a second quantity of PTRS ports associated with a second SRS resource set based at least in part on an indication of one or more SRS resources, the method according to Aspect 25.

[0246] Aspect 27: The number of transmission layers associated with one or more SFN uplink messages is 2, the indication of one or more SRS resources includes a first bit indicating a first PTRS port index and a second bit indicating a second PTRS port index, and determining the frequency resource association between one or more PTRS ports and one or more of the plurality of DMRS ports includes, at least partially based on the first bit, determining that the first PTRS port index is associated with a first SRS resource set; and, at least partially based on the second bit, determining that the second PTRS port index is associated with a second SRS resource set. The method of Aspect 25 or 26.

[0247] Aspect 28: The number of transmission layers associated with one or more SFN uplink messages is greater than 2, the indication of one or more SRS resources includes a first set of bits indicating a first set of one or more PTRS port indexes and a second set of bits indicating a second set of one or more PTRS port indexes, and determining the frequency resource association between one or more PTRS ports and one or more of the plurality of DMRS ports includes, at least partially based on the first set of bits associated with the first SRS resource set, determining that each PTRS index of the first set of one or more PTRS port indexes is associated with a respective DMRS port; and, at least partially based on the second set of bits associated with the second SRS resource set, determining that each PTRS index of the second set of one or more PTRS port indexes is associated with a respective DMRS port. The method of any one of Aspects 25 to 27.

[0248] Aspect 29: An apparatus for wireless communication in 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 17.

[0249] Aspect 30: An apparatus for wireless communication in a UE, comprising at least one means for performing the method of any one of Aspects 1 to 17.

[0250] Aspect 31: A non-transitory computer-readable medium storing code for wireless communication in a UE, the code including instructions executable by a processor to perform the method of any one of Aspects 1 to 17.

[0251] Aspect 32: An apparatus for wireless communication in a network entity, 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 18 to 28.

[0252] Aspect 33: An apparatus for wireless communication in a network entity, comprising at least one means for performing the method of any one of Aspects 18 to 28.

[0253] Aspect 34: A non-transitory computer-readable medium storing code for wireless communication in a network entity, the code including instructions executable by a processor to perform the method of any one of Aspects 18 to 28.

[0254] Note that the methods described herein are illustrative of possible implementations, that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Further, aspects from two or more of these methods may be combined.

[0255] As an example, aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description. However, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques 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 wireless technologies not explicitly mentioned herein.

[0256] The information and signals described herein may be represented using any of a variety of techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0257] With respect to the present disclosure of this specification, the various exemplary blocks and components described may be implemented or carried out using a general-purpose processor, DSP, ASIC, CPU, 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. The general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0258] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. When the functions are implemented using software executed by a processor, they may be stored as one or more instructions or codes on a computer-readable medium or transmitted using one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. The features implementing the functions may also be physically located in various places, including being distributed such that portions of the functions are implemented at different physical locations.

[0259] A computer-readable medium includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. The non-transitory storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory media that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general purpose or special purpose computer or a general purpose or special purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disk, optical disk, digital versatile disc (DVD), floppy disk, and Blu-ray (registered trademark) disc. Disk can magnetically reproduce data, and disc can optically reproduce data using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0260] As used herein, including within the scope of the claims, "or" as used in a listing of items (e.g., a listing of items followed by phrases such as "at least one of" or "one or more of") indicates an inclusive listing such that, for example, a listing of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, the phrase "based on" as used herein should not be construed as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" may, without departing from the scope of the present disclosure, be based on both condition A and condition B. In other words, as used herein, the phrase "based on" shall be construed in the same manner as the phrase "at least partially based on".

[0261] The term "determine" or "determining" encompasses various operations, and thus "determining" can include calculating, computing, processing, deriving, investigating, looking up (e.g., via examining a table, database, or other data structure), elucidating, etc. Also, "determining" can include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Further, "determining" can include resolving, obtaining, selecting, choosing, establishing, and other similar acts.

[0262] In the accompanying drawings, like components or features may have the same reference label. Further, various components of the same type may be distinguished by attaching, after the reference label, a dash and a second label that differentiates the similar components. If only the first reference label is used in the present specification, the description is applicable to any of the similar components having the same first reference label, regardless of the second reference label or any subsequent reference labels.

[0263] The description set forth in this specification with respect to the accompanying drawings describes exemplary configurations and is not intended to represent all examples that may be implemented or that fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not mean "preferred" or "advantageous over other examples." The detailed description includes specific details to bring about an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0264] The description of the present specification is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Accordingly, the present disclosure is not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication in user equipment (UE), Receiving a first control signaling that schedules the transmission of sounding reference signals from a plurality of sounding reference signal resource sets, which include at least a first sounding reference signal resource set and a second sounding reference signal resource set; Receiving a second control signaling that includes an instruction for one or more sounding reference signal resources from the plurality of sounding reference signal resource sets, and that schedules the transmission of one or more single-frequency network uplink messages at least in part based on the instruction for the one or more sounding reference signal resources, wherein each demodulated reference signal port of a plurality of demodulated reference signal ports associated with the one or more single-frequency network uplink messages transmits and receives from a plurality of separate antenna panels of the UE. Determining frequency resource associations between one or more phase-tracking reference signal ports and one or more demodulation reference signal ports among the multiple demodulation reference signal ports, based at least in part on port association rules and the aforementioned indications for one or more sounding reference signal resources, A method comprising transmitting one or more single-frequency network uplink messages based at least in part on the frequency resource association.

2. The maximum number of phase-tracing reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are non-codebook-based messages, and the port association rule indicates that the matching sounding reference signal resource indices of the first sounding reference signal resource set and the second sounding reference signal resource set have the same phase-tracing reference signal port index. Determining the frequency resource association between the one or more demodulation reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on one or more sounding reference signal resources from the first sounding reference signal resource set or the second sounding reference signal resource set, or The method according to claim 1, wherein the maximum number of phase-tracing reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are non-codebook-based messages, and determining the frequency resource association between the one or more demodulation reference signal ports and the one or more phase-tracing reference signal ports is at least partially based on the fact that one or more indicated sounding reference signal resources from either the first sounding reference signal resource set or the second sounding reference signal resource set have a minimum sounding reference signal resource set identifier.

3. The method according to claim 1, wherein the maximum number of phase-tracking reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are non-codebook-based messages, and the instruction for the one or more sounding reference signal resources from the multiple sounding reference signal resource sets includes a first instruction for the one or more sounding reference signal resources from the first sounding reference signal resource set giving a first number of phase-tracking reference signal ports, and a second instruction for the one or more sounding reference signal resources from the second sounding reference signal resource set giving a second number of phase-tracking reference signal ports, and determining the frequency resource association between the one or more demodulation reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on the first number of phase-tracking reference signal ports, the second number of phase-tracking reference signal ports, or both.

4. Determining the frequency resource association between the one or more demodulation reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on the fact that either the one or more sounding reference signal resources indicated from the first sounding reference signal resource set or the one or more sounding reference signal resources indicated from the second sounding reference signal resource set provides a larger number of phase-tracking reference signal ports, or The method according to claim 3, wherein determining the frequency resource association between the one or more demodulation reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on the fact that either the one or more sounding reference signal resources indicated from the first sounding reference signal resource set or the one or more sounding reference signal resources indicated from the second sounding reference signal resource set give a smaller number of phase-tracking reference signal ports.

5. The maximum number of phase-tracking reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are codebook-based messages, the port association rule indicates that a shared association between a demodulated reference signal port and a phase-tracking reference signal port index, as shown in the transmit precoding matrix, is common across multiple transmit precoding matrices associated with the one or more single-frequency network uplink messages, and the determination of the frequency resource association between the one or more demodulated reference signal ports and the one or more phase-tracking reference signal ports is performed at least in part on a first transmit precoding matrix associated with the first sounding reference signal resource set, or from a second transmit precoding matrix associated with the second sounding reference signal resource set, or The maximum number of phase-tracing reference signal ports for the UE is limited to 1, and the reception of the second control signaling is The method according to claim 1, comprising receiving an instruction for a value corresponding to one of the plurality of demodulation reference signal ports, wherein determining the frequency resource association between the one or more phase-tracking reference signal ports and one of the one or more demodulation reference signal ports is at least partially based on the value and a table showing the association between a single phase-tracking reference signal port and the plurality of demodulation reference signal ports.

6. The method according to claim 1, wherein the maximum number of phase-tracking reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are codebook-based messages, the instruction for the one or more sounding reference signal resources from the set of multiple sounding reference signal resources includes a first instruction for a first transmit precoding matrix and a second instruction for a second transmit precoding matrix, and determining the frequency resource association between the one or more demodulated reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on a selectivity of the first transmit precoding matrix or the second transmit precoding matrix, at least partially based on a selectivity of the transmit precoding matrix.

7. The transmit precoding matrix selection criterion is at least partially based on the lowest sounding reference signal resource set identifier associated with either the first transmit precoding matrix or the second transmit precoding matrix, or The transmit precoding matrix selection criterion is at least partially based on the number of phase-tracking reference signal ports obtained from the first transmit precoding matrix or the second transmit precoding matrix, or The transmission precoding matrix selection criterion is at least partially based on a subset of codebooks associated with the first and second transmission precoding matrices, wherein the subset of codebooks represents a partially coherent transmission precoding matrix or a non-coherent transmission precoding matrix, or The method according to claim 6, wherein the transmission precoding matrix selection criterion is at least partially based on the number of physical uplink shared channel ports associated with the first transmission precoding matrix and the second transmission precoding matrix.

8. The method according to claim 1, wherein the port association rule indicates that a first set of one or more phase-tracking reference signal ports is associated with the first sounding reference signal resource set, and a second set of one or more phase-tracking reference signal ports is associated with the first sounding reference signal resource set, and the first set of one or more phase-tracking reference signal ports is different from the second set of one or more phase-tracking reference signal ports.

9. Determining the frequency resource association between the one or more phase-tracing reference signal ports and the one or more demodulation reference signal ports is Determining a first number of phase-tracing reference signal ports associated with the first set of sounding reference signal resources, based at least in part on the instructions of the one or more sounding reference signal resources, The method includes determining a second number of phase-tracking reference signal ports associated with the second set of sounding reference signal resources, at least in part, based on the instructions for the one or more sounding reference signal resources, or The number of transmitting layers associated with the one or more single-frequency network uplink messages is 2, and the indication of the one or more sounding reference signal resources includes a first bit indicating a first phase-tracking reference signal port index and a second bit indicating a second phase-tracking reference signal port index, and determining the frequency resource association between the one or more phase-tracking reference signal ports and the one or more demodulation reference signal ports is Based at least in part on the first bit, it is determined that the first phase-tracing reference signal port index is associated with the first sounding reference signal resource set, The method includes determining, at least in part, that the second phase-tracking reference signal port index is associated with the second sounding reference signal resource set, or The number of transmitting layers associated with the one or more single-frequency network uplink messages is greater than 2, and the indication of the one or more sounding reference signal resources includes a first set of bits indicating a first set of one or more phase-tracking reference signal port indices and a second set of bits indicating a second set of one or more phase-tracking reference signal port indices, and determining the frequency resource association between the one or more phase-tracking reference signal ports and the one or more demodulated reference signal ports among the multiple demodulated reference signal ports, Based at least in part on the first set of bits associated with the first sounding reference signal resource set, it is determined that each phase-tracking reference signal index in the first set of one or more phase-tracking reference signal port indices is associated with its respective demodulation reference signal port. The method of claim 8, comprising determining, on at least a portion of the second set of bits associated with the second sounding reference signal resource set, that each phase-tracking reference signal index in the second set of one or more phase-tracking reference signal port indices is associated with its respective demodulation reference signal port.

10. A method for wireless communication in a network entity, Outputting a first control signaling that schedules the transmission of sounding reference signals from a plurality of sounding reference signal resource sets, which include at least a first sounding reference signal resource set and a second sounding reference signal resource set; Outputting a second control signaling that includes an instruction for one or more sounding reference signal resources from the plurality of sounding reference signal resource sets, and that schedules the transmission of one or more single-frequency network uplink messages based at least partially on the instruction for the one or more sounding reference signal resources, Determining frequency resource associations between one or more phase-tracking reference signal ports and one or more demodulation reference signal ports among a plurality of demodulation reference signal ports, based at least in part on port association rules and the aforementioned indications for one or more sounding reference signal resources, A method comprising receiving one or more single-frequency network uplink messages based at least in part on the port association rules.

11. The maximum number of phase-tracking reference signal ports for user equipment (UE) is greater than 1, the one or more single-frequency network uplink messages are non-codebook-based messages, the port association rule indicates that the matching sounding reference signal resource indices of the first sounding reference signal resource set and the second sounding reference signal resource set have the same phase-tracking reference signal port index, or The maximum number of phase-tracking reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are non-codebook-based messages, and determining the frequency resource association between the one or more demodulated reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on the fact that one or more indicated sounding reference signal resources from either the first sounding reference signal resource set or the second sounding reference signal resource set have the lowest sounding reference signal resource set identifier, or The maximum number of phase-tracking reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are non-codebook-based messages, the instruction for the one or more sounding reference signal resources from the multiple sounding reference signal resource sets includes a first instruction for the one or more sounding reference signal resources from the first sounding reference signal resource set giving a first number of phase-tracking reference signal ports, and a second instruction for the one or more sounding reference signal resources from the second sounding reference signal resource set giving a second number of phase-tracking reference signal ports, and determining the frequency resource association between the one or more demodulated reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on the first number of phase-tracking reference signal ports, the second number of phase-tracking reference signal ports, or both, or The maximum number of phase-tracking reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are codebook-based messages, the port association rules indicate that the shared association between demodulated reference signal ports and phase-tracking reference signal port indices, as shown in the transmit precoding matrix, is common across multiple transmit precoding matrices associated with the one or more single-frequency network uplink messages, and the determination of the frequency resource association between the one or more demodulated reference signal ports and the one or more phase-tracking reference signal ports is performed at least in part on a first transmit precoding matrix associated with the first sounding reference signal resource set, or from a second transmit precoding matrix associated with the second sounding reference signal resource set, or The maximum number of phase-tracking reference signal ports for the UE is greater than 1, the one or more single-frequency network uplink messages are codebook-based messages, the instruction for the one or more sounding reference signal resources from the multiple sounding reference signal resource sets includes a first instruction for a first transmit precoding matrix and a second instruction for a second transmit precoding matrix, and determining the frequency resource association between the one or more demodulated reference signal ports and the one or more phase-tracking reference signal ports is at least partially based on the selection of the first transmit precoding matrix or the second transmit precoding matrix, at least partially based on the transmit precoding matrix selection criteria, or The maximum number of phase-tracing reference signal ports for the UE is limited to 1, and the output of the second control signaling is: The method according to claim 10, comprising outputting an instruction for a value corresponding to one of a plurality of demodulation reference signal ports associated with a user device (UE), wherein determining the frequency resource association between the one or more phase-tracking reference signal ports and one of the one or more demodulation reference signal ports is at least partially based on the value and a table showing the association between a single phase-tracking reference signal port and the plurality of demodulation reference signal ports.

12. The method according to claim 10, wherein the port association rule indicates that a first set of one or more phase-tracking reference signal ports is associated with the first sounding reference signal resource set, and a second set of one or more phase-tracking reference signal ports is associated with the first sounding reference signal resource set, and the first set of one or more phase-tracking reference signal ports is different from the second set of one or more phase-tracking reference signal ports.

13. Determining the frequency resource association between the one or more phase-tracing reference signal ports and the one or more demodulation reference signal ports is Determining a first number of phase-tracing reference signal ports associated with the first set of sounding reference signal resources, based at least in part on the instructions of the one or more sounding reference signal resources, The method includes determining a second number of phase-tracking reference signal ports associated with the second set of sounding reference signal resources, at least in part, based on the instructions for the one or more sounding reference signal resources, or The number of transmitting layers associated with the one or more single-frequency network uplink messages is 2, and the indication of the one or more sounding reference signal resources includes a first bit indicating a first phase-tracking reference signal port index and a second bit indicating a second phase-tracking reference signal port index, and determining the frequency resource association between the one or more phase-tracking reference signal ports and the one or more demodulation reference signal ports is Based at least in part on the first bit, it is determined that the first phase-tracing reference signal port index is associated with the first sounding reference signal resource set, The method includes determining, at least in part, that the second phase-tracking reference signal port index is associated with the second sounding reference signal resource set, or The number of transmitting layers associated with the one or more single-frequency network uplink messages is greater than 2, and the indication of the one or more sounding reference signal resources includes a first set of bits indicating a first set of one or more phase-tracking reference signal port indices and a second set of bits indicating a second set of one or more phase-tracking reference signal port indices, and determining the frequency resource association between the one or more phase-tracking reference signal ports and the one or more demodulated reference signal ports among the multiple demodulated reference signal ports, Based at least in part on the first set of bits associated with the first sounding reference signal resource set, it is determined that each phase-tracking reference signal index in the first set of one or more phase-tracking reference signal port indices is associated with its respective demodulation reference signal port. The method according to claim 12, further comprising determining, based at least in part on the second set of bits associated with the second sounding reference signal resource set, that each phase-tracking reference signal index in the second set of one or more phase-tracking reference signal port indices is associated with its respective demodulation reference signal port.

14. A device for wireless communication in user equipment (UE), Processor and The memory coupled to the aforementioned processor, The instruction is stored in the memory and is executable by the processor, and the instruction is executed by the device, A first control signaling is received that schedules the transmission of sounding reference signals from a plurality of sounding reference signal resource sets, which include at least a first sounding reference signal resource set and a second sounding reference signal resource set. A second control signaling is received which includes an instruction for one or more sounding reference signal resources from the set of multiple sounding reference signal resources, and which schedules the transmission of one or more single-frequency network uplink messages based at least partially on the instruction for the one or more sounding reference signal resources, and each demodulated reference signal port of the set of multiple demodulated reference signal ports associated with the one or more single-frequency network uplink messages is transmitted from a set of separate antenna panels of the UE. Based at least in part on the port association rules and the aforementioned designation of one or more sounding reference signal resources, a frequency resource association is determined between one or more phase-tracking reference signal ports and one or more demodulation reference signal ports among the plurality of demodulation reference signal ports. A device that causes one or more single-frequency network uplink messages to be transmitted, at least in part, based on the frequency resource association.

15. A device for wireless communication in a network entity, Processor and The memory coupled to the aforementioned processor, The instruction is stored in the memory and is executable by the processor, and the instruction is executed by the device, Outputting a first control signaling that schedules the transmission of sounding reference signals from a plurality of sounding reference signal resource sets, which include at least a first sounding reference signal resource set and a second sounding reference signal resource set, A second control signaling is output which includes an instruction for one or more sounding reference signal resources from the plurality of sounding reference signal resource sets, and which schedules the transmission of one or more single-frequency network uplink messages based at least partially on the instruction for the one or more sounding reference signal resources, Based at least in part on the port association rules and the aforementioned designation of one or more sounding reference signal resources, a frequency resource association is determined between one or more phase-tracking reference signal ports and one or more demodulation reference signal ports among the multiple demodulation reference signal ports. A device that causes one or more single-frequency network uplink messages to be received based at least in part on the port association rules.

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