WO2025160712A1

WO2025160712A1 - Channel state information reference signal port indexing and mapping for wireless communication

Info

Publication number: WO2025160712A1
Application number: PCT/CN2024/074519
Authority: WO
Inventors: Hong He; Chunxuan Ye; Dawei Zhang; Wei Zeng; Haitong Sun; Qiming Li; Ankit Bhamri
Original assignee: Apple Inc
Current assignee: Apple Inc
Priority date: 2024-01-29
Filing date: 2024-01-29
Publication date: 2025-08-07
Anticipated expiration: 2026-07-29

Abstract

A UE and network device are described. The UE can be configured with multiple channel state information reference signal (CSI-RS) resource configurations associated with an increased quantity of CSI-RS ports, and determine an aggregated set of CSI-RS resources based on these multiple CSI-RS configurations. In some examples, configuration signaling may indicate common parameter values and CSI-RS resource specific parameter values. In some examples, a first CSI-RS resource configuration can be a first periodicity configuration (such as one of periodic, aperiodic, or semi-persistent) and a second CSI-RS resource configuration can be one of a second periodicity configuration, that is the same or different as the first periodicity configuration. In some examples, an order of indexing for the CSI-RS ports may be determined based on the aggregated set of CSI-RS resources.

Description

CHANNEL STATE INFORMATION REFERENCE SIGNAL PORT INDEXING AND MAPPING FOR WIRELESS COMMUNICATION

TECHNICAL FIELD

This application relates generally to wireless communication systems, including systems, apparatuses, and methods for channel state information reference signal port indexing and mapping for wireless communication.

BACKGROUND

Wireless mobile communication technology uses various standards and protocols to transmit data between a network device (e.g., a base station, a radio head, etc. ) and a wireless communication device. Wireless communication system standards and protocols can include, for example, 3rd Generation Partnership Project (3GPP) long term evolution (LTE) (e.g., 4G) , 3GPP new radio (NR) (e.g., 5G) , and IEEE 802.11 standard for wireless local area networks (WLAN) (commonly known to industry groups as ) .

As contemplated by the 3GPP, different wireless communication systems standards and protocols can use various radio access networks (RANs) for communicating between a network device of the RAN (which may also sometimes be referred to generally as a RAN node, a network node, or simply a node) and a wireless communication device known as a UE. 3GPP RANs can include, for example, global system for mobile communications (GSM) , enhanced data rates for GSM evolution (EDGE) RAN (GERAN) , Universal Terrestrial Radio Access Network (UTRAN) , Evolved Universal Terrestrial Radio Access Network (E-UTRAN) , and/or Next-Generation Radio Access Network (NG-RAN) .

Each RAN may use one or more radio access technologies (RATs) to perform communication between the network device and the UE. For example, the GERAN implements GSM and/or EDGE RAT, the UTRAN implements universal mobile telecommunication system (UMTS) RAT or other 3GPP RAT, the E-UTRAN implements LTE RAT (sometimes simply referred to as LTE) , and NG-RAN implements NR RAT (sometimes referred to herein as 5G RAT, 5G NR RAT, or simply NR) . In certain deployments, the E-UTRAN may also implement NR RAT. In certain deployments, NG-RAN may also implement LTE RAT.

A network device used by a RAN may correspond to that RAN. One example of an E-UTRAN network device is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as evolved Node B, enhanced Node B, eNodeB, or eNB) . One example of an NG-RAN network device is a next generation Node B (also sometimes referred to as a g Node B or gNB) .

A RAN provides its communication services with external entities through its connection to a core network (CN) . For example, E-UTRAN may utilize an Evolved Packet Core (EPC) , while NG-RAN may utilize a 5G Core Network (5GC) .

BRIEF DESCRIPTION OF THE DRAWINGS

To easily identify the discussion of any particular element or act, the most significant digit or digits in a reference number refer to the figure number in which that element is first introduced.

FIG. 1 shows an example wireless communication system, according to embodiments described herein.

FIG. 2A shows an example resource combination, according to one or more aspects described herein.

FIG. 2B shows an example resource combination, according to one or more aspects described herein.

FIG. 3A shows an example of a set of resources, according to one or more aspects described herein.

FIG. 3B shows an example of a port assignment, according to one or more aspects described herein.

FIG. 3C shows an example of a port assignment, according to one or more aspects described herein.

FIG. 4A shows an example port assignment, according to one or more aspects described herein.

FIG. 4B shows an example port assignment, according to one or more aspects described herein.

FIG. 4C shows an example port assignment, according to one or more aspects described herein.

FIG. 5 shows an example method of wireless communication by a UE, according to one or more aspects described herein.

FIG. 6 shows another example method of wireless communication by a network device, according to one or more aspects described herein.

FIG. 7 shows an example method of wireless communication by a UE, according to one or more aspects described herein.

FIG. 8 shows another example method of wireless communication by a network device, according to one or more aspects described herein.

FIG. 9 shows an example method of wireless communication by a UE, according to one or more aspects described herein.

FIG. 10 shows another example method of wireless communication by a network device, according to one or more aspects described herein.

FIG. 11 illustrates an example architecture of a wireless communication system, according to embodiments described herein.

FIG. 12 illustrates an example system for performing signaling between a wireless device and a network device, according to embodiments described herein.

DETAILED DESCRIPTION

Various embodiments are described with regard to a user equipment (UE) . However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and/or firmware to exchange information and data with a network. Therefore, the UE as described herein is used to represent any appropriate electronic device.

Current techniques for multiple input multiple output (MIMO) wireless communications involve the use of multiple antennas (e.g., antenna arrays using multiple antenna elements) at one or more both the transmitter and receiver in a communications system. MIMO enhances the performance of wireless communication by exploiting spatial diversity and multipath propagation. By simultaneously transmitting multiple data streams and leveraging the spatial dimension, MIMO systems can improve data throughput, reliability, and overall communication efficiency.

Network devices of wireless communications systems, including those using MIMO techniques, obtain channel state information (CSI) from UEs with which they communicate to gain insights into the current state of the communication channel between the UEs and the network devices (e.g., base stations serving the UEs) . The network may leverage CSI for adaptive modulation and coding, beamforming, resource allocation, interference management, and so on. Network devices transmit CSI reference signals (CSI-RS) to facilitate the measurement and reporting of CSI by UE.

For network devices using multiple antenna techniques such as MIMO, each antenna port of the multiple antennas may transmit a corresponding CSI-RS on a time-frequency resource for the UE to measure. For example, a network device may communicate with a UE using a 2-by-4 array of antenna element pairs, totaling 16 antenna ports having 16 corresponding CSI-RS ports. In this example, each pair of antenna elements may be one antenna element oriented at +45° and a second antenna element oriented at -45° to the antenna array, the antenna array including 8 such pairs arranged in an array having 2 rows and 4 columns.

As the size of antenna arrays for MIMO communications increase, current techniques for CSI measurement and quantity of CSI-RS ports (e.g., 32 ports) are inadequate. For example, larger antenna arrays may require a larger quantity of CSI-RS ports (e.g., greater than 32 CSI-RS ports, including 48, 64, 128, and more CSI-RS ports) . In some examples, such quantity of CSI-Rs ports may be targeted for frequency range 1 (FR1) , including frequency bands below 6 GHz, which may also be referred to as low frequency bands, or sub-6 GHz bands. In some cases, FR1 may include various frequency bands or sets of frequency bands from about 410 MHz to about 7.125 GHz.

In some examples, CSI reporting may use a CSI-RS resource indicator (CRI) . The UE can be configured with a set of non zero power CSI-RS (NZP-CSI-RS) resources out of which the UE may be asked by the network to report a subset. The network device (e.g., base station) can use the CRI to switch between CSI-RS beams which are typically more directional than other beams used by the network device (e.g., synchronization signal block (SSB) beams) . Current techniques for CRI-based CSI reporting for hybrid beamforming use a codebook design. For an increased quantity of CSI-RS ports, it is desirable to avoid creating a new codebook design, for example to allow for backward compatibility with existing (e.g., legacy) UE devices. However, supporting an increased quantity of CSI-RS ports, for example based on legacy CSI-RS resources, may require increased signaling overhead. In some examples, an existing codebook design may assume or otherwise consider the first half of the CSI-RS ports to be associated with antenna ports having a first polarization (e.g., +45°) and a second half of the CSI-RS ports to be associated with antenna ports having a second polarization (e.g., -45°) .

Techniques are described to support an increased quantity (e.g., greater than about 32) of CSI-RS ports, for example for CRI (s) -based CSI reporting for hybrid beamforming. At least some techniques use an existing codebook design. Some examples described herein decrease, or minimize, signaling overhead relative to existing technique. Some examples configure a common set of parameters for CSI-RS resource configurations, as well as resource-specific parameters for CSI-RS resource configurations. In some examples, some resource types support CSI-RS resource aggregation. In some examples described herein, the CSI-RS ports are counted consistent with a legacy design where the first half of the CSI ports are associated with antenna ports with one polarization and the second half of the CSI ports are associated with antenna ports with the alternative polarization. In some examples, a set of port patterns for some devices (e.g., Y-ports CSI-RS pattern, where a UE is capable of being configured for less than or equal to 32 ports) is a subset of a set of port patterns for other devices (e.g., X-ports pattern CSI-RS pattern, where a UE is capable of being configured for greater than 32 ports) .

According to certain aspects of this disclosure, a variety of approaches are described to create resources for an increased quantity of CSI-RS resources (which may also be referred to as X-ports herein; a fewer number (e.g., a legacy quantity) of CSI-RS resources may be referred to as Y-ports) . In some examples, an X-ports CSI-RS resource for a CSI reporting is composed as an aggregation of K CSI-RS configurations, where K is a total quantify of CSI-RS configurations. In some examples Σ_kN_k= {48, 64, 96, 128} , where N_k represents the number of CSI-RS ports for k_th CSI-RS configuration, where k=0, 1, .., K-1.

In some examples, for each CSI-RS resource, one of the follow code division multiplexing (CDM) types for CSI-RS resource mapping can be configured for each resource: FD-CDM2, CDM4-FD2-TD2, CDM8-FD2-TD4. FD-CDM2 means that CDM is used to differentiate two resource elements (REs) occupying different subcarriers. CDM4-FD2-TD2 is multiplexing four ports on four REs of two carriers in the frequency domain and two symbols in the time domain. CDM8-FD2-TD4 is multiplexing eight ports on eight REs with two carriers in the frequency domain and four symbols in the time domain.

In one or more aspects described herein, the following parameters maybe included in the RRC signal for a X-ports CSI-RS resource: a list of ‘K’ CSI-RS resource configurations for a legacy configuration (e.g., no more than 32 ports) , a hard-encoded rule for aggregated CSI-RS configurations, or both.

For a list of K CSI-RS resource configurations, in some examples, the legacy CSI-RS resource configuration may indicate the CSI-RS resource element locations according to the legacy resource configuration. For the hard-encoded rule, in some examples, a single antenna port number may be applied for all K CSI-RS configurations, that is, for N_k=N, k=0, 1, .... In other examples, different antenna port numbers can be indicated for different aggregated CSI-RS configurations. For instance, 48-ports CSI-RS can be aggregated by {N₁=32, N₂=16} legacy CSI-RS ports.

FIG. 1 shows an example wireless communications system 100, according to one or more aspects described herein. In one or more embodiments, wireless communications system 100, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein.

Wireless communications system 100 includes a UE 102 and a network device 104. One or more UEs including the UE 102 may be being served by (e.g., has an established radio resource control (RRC) connection with) the network device 104 via communication link 120. Coverage area 110 (e.g., a cell or serving cell) is the service area for the RF spectrum band utilized by network device 104. In one or more embodiments, communication link 120 may include a downlink connection and/or uplink connection.

In one or more embodiments, network device 104 utilizes beam steering, which may also be, include, or be referred to as electronic beam steering. Additionally, in one or more embodiments, UE 102 utilizes beam steering to receive signals, transmit signals, or both. As used herein, electronic beam steering refers, without limitation, to the ability of a device (e.g., network device 104) to perform beamforming, beam shaping, or other multiple antenna or multiple antenna-element techniques that control, direct, or otherwise shape electromagnetic energy radiated from the network device 104 in different directions and with different magnitudes or amplitudes. Electronic beam steering also refers to the network device 104 adjusting antennas or antenna elements to increase or decrease the ability to receive electromagnetic radiation from a particular direction. Such reception beamforming may be referred to as a “receive beams, ” as opposed to transmit beamforming using “transmit beams. ” A network device 104 uses beam steering for the transmission of signals to UEs (e.g., UE 102) served by the network device 104. Such signals can include data signals, control signals, or both. Control signal may include reference signals, synchronization signals, or control channels, or combinations of these. The resulting transmit beams or receive beams may be a beam sweep 106.

Network device 104 utilizes at least one antenna array 130 for communication with the UE 102. In the example illustrated for wireless communications system 100, network device 104 the antenna array 130 includes an array of antenna element pairs arranged in four rows and six columns, with a total of 48 antenna elements. Each antenna element pair include a first antenna element 132 that is oriented orthogonally to a second antenna element 134. In this example, each of the first antenna element 132 is oriented at +45° to the antenna array 130 and each of the second antenna element is oriented at -45° to the antenna array 130 (e.g., the antenna elements are cross-polarized) . In other examples, one or more of the following may be used for the antenna array 130 consistent with the disclosure herein: a different numbers of rows, a different numbers of columns, a different arrangement or orientation of antenna element pairs, different groupings of antenna elements (e.g., 1, or 3 or more antenna elements) , different polarizations of antenna elements (e.g., other than cross-polarized) , or non-square or non-rectangular orientations of antenna elements or antenna element pairs.

In one or more embodiments, network device 104 utilizes beam steering to transmit reference signals for the UE 102 to use to determine channel state information, including CSI-RSs. Although references CSI-RS, techniques described herein may apply to other reference signals used to determine channel state information. According to one or more techniques described herein, each CSI-RS port may correspond to an antenna port. In some examples, a first quantity of antenna elements of antenna array 130 (e.g., each first antenna element 132) may make up a first set of antenna port indices, and a second quantity of antenna elements of antenna array 130 (e.g., each second antenna element 134) may make up a second set of antenna port indices.

In some examples, an antenna port may correspond to a particular physical antenna element of the antenna array 130, but the correspondence need not be one-to-one, and antenna ports may correspond to different configurations of physical antenna elements according to other examples.

In the example of wireless communications system 100, a set of CSI-RS 122 may be transmitted by the network device 104 during a set of time-frequency resources 140. In some examples, the set of time-frequency resources 140 include a slot and a physical resource block (PRB) , although it should be understood that the set of CSI-RS 122 may be transmitted periodically, aperiodically, according to a semi-persistent configuration, or span more than one PRB, or span multiple slots in other examples. The set of time-frequency resources 140 include first CSI-RS resources 142 and second CSI-RS resources 144.

According to one or more examples described herein, the UE 102 receives configuration signaling 124 that indicates common parameters and resource-specific parameters. The UE 102 receives configuration signaling 124 that indicates common parameter values for a set of CSI-RS resource configurations associated with a set of CSI-RS ports. The set of CSI-RS resource configurations can include at least a first CSI-RS resource configuration applicable to a first set of CSI-RS ports and a second CSI-RS resource configuration applicable to a second set of CSI-RS ports. The UE 102 also receives configuration signaling 124 that indicates at least a first set of resource-specific parameter values for the first CSI-RS resource configuration and a second set of resource-specific parameter values for the second CSI-RS resource configuration. The UE 102 then monitors an aggregated set of CSI-RS resources for reference signals during a slot, such as the slot of time-frequency resources 140. In one or more examples, the aggregated set of CSI-RS resources includes a first set of resources monitored according to the common parameter values and the first set of resource-specific parameter values. The aggregated set also includes a second set of resources monitored according to the common parameter values and the second set of resource-specific parameter values.

In one or more embodiments, the configuration signaling 124, for example for an increased quantity of CSI-RS ports, includes a single set of parameters that are configured for the UE 102 and commonly applied to minimize the radio resource control (RRC) signaling overhead for the configuration signaling. In some cases, the single set of parameters are configured for all the aggregated CSI-RS resources. In one or more examples, these common parameters include a scrambling identifier, a quasi-colocation (QCL) information for periodic CSI-RS (e.g. Qcl-infoPeriodicCSI-RS) , a power control offset value between a CSI-RS and a downlink shared channel (e.g., powerControlOffset) , or a power control offset between the CSI-RS and a synchronization signal block (e.g., powerControlOffsetSS) . The scrambling identifier can be used to generate the CSI-RS sequence for each CSI-RS resource. The quasi-colocation (QCL) information can be a single TCI-state is applied for all aggregated CSI-RS resources.

In one or more embodiments, the configuration signaling 124, for example for an increased quantity of CSI-RS ports, includes a set of resource-specific parameters configured for the UE 102. For example, resource-specific parameters can include one or more of resource mapping information (e.g., resourceMapping, for example a quantity of antenna ports, a frequency domain resource allocation, a time domain resource allocation, or a CDM type) , or a periodicity and/or offset (e.g., periodicityAndOffset, for example a periodicity, or a time offset) .

Table 1 below summarizes an example CSI-RS structure with aggregating K CSI-RS configurations, including the common parameters and what are configuration-specific parameters:

Table 1: details for resource-dedicated and resource-common parameters

According to one or more examples described herein, the UE 102 uses variable resource type combinations for CSI-RS resources with an increased quantity of CSI-RS ports. The UE 102 may receive configuration signaling 124 that indicates a first CSI-RS resource configuration of a set of CSI-RS resource configurations. The first CSI-RS resource configuration can be associated with a first set of CSI-RS ports. The first CSI-RS resource configuration can have a first periodicity configuration that is one of aperiodic, periodic, or semi-persistent. The UE 102 may receive further configuration signaling 124 indicating a second CSI-RS resource configuration of the set of CSI-RS resource configurations. The second CSI-RS resource configuration can be associated with the second set of CSI-RS ports, and the second CSI-RS resource configuration can have a second periodicity configuration that is one of aperiodic, periodic, or semi-persistent. The UE 102 can then monitor an aggregated set of CSI-RS resources for reference signals during a slot, where the aggregated set includes a first set of resources monitored according to the first CSI-RS resource configuration and the first periodicity, and the aggregated set including a second set of resources monitored according to the second CSI-RS resource configuration and the second periodicity.

According to one or more examples described herein, the UE 102 uses one of a variety of different approaches for the antenna port indexing for the aggregated CSI-RS resources for an increased quantity of CSI-RS ports. The UE 102 receives configuration signaling indicating a first CSI-RS resource configuration. The first CSI-RS resource configuration may be associated with a first set of a plurality of CSI-RS ports. Additionally, the UE 102 receives configuration signaling indicating a second CSI-RS resource configuration. The second CSI-RS resource configuration is associated with a second set of CSI-RS ports. The UE 102 then determines an order of antenna port indexes for the plurality of CSI-RS ports (including the first and second sets of CSI-RS ports) based on the first CSI-RS resource configuration and the second CSI-RS resource configuration. The order of antenna port indexes is for an aggregated set of CSI-RS resources in a slot. The UE 102 then monitors for reference signals during the slot according to the determined order of antenna port indexing for the aggregated set of CSI-RS resources.

FIG. 2A shows an example resource combination 201, according to one or more aspects described herein. In one or more embodiments, example resource combination 201, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein.

According to certain aspects of this disclosure, a variety of approaches may be used to combine legacy resource configuration (e.g., ‘N_k-ports’ CSI-RS resource) to construct an aggregated resource configuration for an increased quantity of CSI-RS ports (e.g., ‘X-port’ CSI-RS resource) . The resource type for the aggregated resource configuration (e.g., the ‘X-port’ CSI-RS resource) set to ‘aperiodic’ , ‘periodic’ , or ‘semi-persistent’ (SP) . In some examples, the configuration being one of ‘aperiodic’ , ‘periodic’ , or ‘semi-persistent’ (SP) is referred to as a periodicity, and the combination may include a first periodicity and a second periodicity, which may be the same or different.

According to one or more examples, various resource types of CSI-RS resource can be combined (e.g., combinations of aperiodic, periodic, or semi-persistent) . The example resource combination 201 shows the aggregation of legacy resource configurations (e.g., for no more than 32 CSI-RS ports) .

According to one or more examples, the first periodicity and the second periodicity configurations are set to be a same one of aperiodic, periodic, or semi-persistent. To form an aperiodic, periodic, or semi-persistent (SP) ‘X-port’ CSI-RS resource (e.g., an aggregated set of CSI-RS resources, for more than 32 CSI-RS ports) , the configurations are limited such that the same type of legacy ‘N_k-ports’ CSI-RS resources are aggregated together.

In one or more embodiments, to form a semi-persistent ‘X-port’ CSI-RS resource, the resource type of aggregated legacy resources (e.g., the first and second CSI-RS resource configurations) ‘N_k-ports’ CSI-RS resources, can be both (e.g., all) semi-persistent CSI-RS resource configurations. In other embodiments, to form the semi-persistent ‘X-port’ CSI-RS resource, the aggregated legacy resources can be a combination of periodic and semi-persistent CSI-RS resource configurations.

In one or more embodiments to form an aperiodic ‘X-port’ CSI-RS resource, the resource type of aggregated legacy resources (e.g., the first and second CSI-RS resource configurations) ‘N_k-ports’ CSI-RS resources, can be a combination of two or more of periodic, semi-persistent, or aperiodic CSI-RS resource configurations. In one or more embodiments, all the CSI-RS legacy resources are aperiodic. In some embodiments, one of the CSI-RS resource configurations is periodic or semi-persistent, and at least one other CSI-RS resource configuration is aperiodic.

FIG. 2B shows an example resource combination 202, according to one or more aspects described herein. In one or more embodiments, example resource combination 202, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein.

Resource combination 202 illustrates the example of a first CSI-RS resource configuration that is periodic or semi-persistent, and a second CSI-RS resource configuration that is aperiodic. Periodic CSI-RS resources 222 occur periodically within a slot, including a slot 228 according to a first CSI-RS configuration (for periodic CSI-RS resources 222) provided to a UE by a network device. To complete the aggregated CSI-RS resource configuration 230, the network device transmits to the UE a downlink control information (DCI) message 220 in slot 226 indicating the second CSI-RS configuration. In some examples, the DCI message 220 can carry an indication of a set of CSI-RS resources, which is the second set of CSI-RS resources (for aperiodic CSI-RS resources 224) of the aggregated CSI-RS resource configuration 230.

In some embodiments, for the aggregation of a first CSI-RS resource configuration that is periodic or semi-persistent, and a second CSI-RS resource configuration that is aperiodic, the UE may expect a same transmission configuration indication (TCI) state to be configured for both sets of resources. In other words, each set of resources may have the same quasi colocation information.

In one examples, the resource combination 202 illustrates an aggregation of a first CSI-RS resource configuration that is periodic for a 32-port CSI-RS resource, and a second CSI-RS resource configuration that is aperiodic for a 32-port CSI-RS resource, such that a 64-port ‘X-port’ is formed. The UE can also assume that a same TCI state identifier being configured for both sets of ports.

FIG. 3A shows an example of a set of resources 301, according to one or more aspects described herein. In one or more embodiments, set of resources 301, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein.

According to certain aspects of this disclosure, a variety of approaches maybe considered for the antenna port indexing for the aggregated ‘X-port’ CSI-RS resource 308 (e.g., for greater than 32 CSI-RS ports) . In some embodiments, CSI-RS resource k=0 310 includes N CSI-RS ports, CSI-RS resource k=1 312 includes N CSI-RS ports, CSI-RS resource k=2 314 includes N CSI-RS ports, and so on to CSI-RS resource k=K-1 316 that also includes N CSI-RS ports.

In one or more embodiments, ports (e.g., 3000, …, 3000+X-1) may be assigned to CDM groups frequency first, where the assignment is in the order of CDM groups with increasing subcarrier indices within a PRB. As shown for the set of resources 301, for frequency domain multiplexed (FDM) legacy CSI-RS resource aggregation case, the resources create an aggregated set of resources (e.g., for greater than 32 CSI-RS ports) . that can be shared with legacy CSI-RS resource configurations (e.g., for no more than 32 CSI-RS ports) . In some examples, whether the above-described port-assignment technique is used is implicitly dependent on how the aggregated resources are multiplexed. In some designs, this technique is implicitly used for FDMed resources.

In other embodiments, ports (3000, …, 3000+X-1) may be assigned to CDM groups in the order of increasing CSI-RS resource ID and starting from the CDM group with a lowest frequency within each CSI-RS resource. For example, where an aggregated ‘X-port’ CSI-RS resource is an aggregation (resources according to two or more resource configurations) of K N-port legacy CSI-RS resources as shown for the set of resources 301, the mapping between the n^th CSI-RS port and the k^th component ’ N-ports’ CSI-RS resource can be given as follows:
n=k*N+p, k=0, 1, ..., K-1, p=3000, ... 2999+N

In some examples, whether the above-described port-assignment technique is used is implicitly dependent on how the aggregated resources are multiplexed. In some designs, this technique is implicitly used for TDMed resources.

In some embodiments, resources may be time division multiplexed (TDM) . In such case, assigning to CDM groups in the order of increasing CSI-RS resource ID and starting from the CDM group with a lowest frequency within each CSI-RS resource creates a CSI-RS resource that can be shared with legacy.

FIG. 3B shows an example of a port assignment 302, according to one or more aspects described herein. In one or more embodiments, port assignment 302, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. The example of port assignment 302 is illustrated with reference to a resource block (RB) of 12 subcarriers and 14 symbol periods (e.g., a slot according to some configurations) , and may have a port assignment mapping for CSI-RS port indexes 3000 through 3047 according to the illustrated pattern (e.g., where only the last two digits are shown, such that 0 through 47 are illustrated for clarity) .

The example of port assignment 302 depicts a 48-port CSI-RS resource that is the result of aggregating two FDMed legacy, 24-ports CSI-RS resources, first CSI-RS resources 320 and second CSI-RS resources 322 (which may also be referred to as CSI-RS resources #0 and CSI-RS resources #1 in some cases) . In some embodiments, each CSI-RS resource uses FD-CDM2 multiplexing for CSI-RS resource mapping, where one such CDM group is illustrated as CDM group 324.

In one or more embodiments, each legacy CSI-RS resource (e.g., one of first CSI-RS resources 320 or second CSI-RS resources 322) can be shared with legacy UEs, such that the CSI-RS overhead is reduced (e.g., minimized) .

FIG. 3C shows an example of a port assignment 303, according to one or more aspects described herein. In one or more embodiments, port assignment 303, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. The example of port assignment 302 is illustrated with reference to a resource block (RB) of 12 subcarriers and 14 symbol periods (e.g., a slot according to some configurations) , and may have a port assignment mapping for CSI-RS port indexes 3000 through 3047 according to the illustrated pattern (e.g., where only the last two digits are shown, such that 0 through 47 are illustrated for clarity) .

The example of port assignment 303 also depicts a 48-port CSI-RS resource that is the result of aggregating two FDMed legacy, 24-ports CSI-RS resources, first CSI-RS resources 330 and second CSI-RS resources 332 (which may also be referred to as CSI-RS resources #0 and CSI-RS resources #1 in some cases) . In some embodiments, each CSI-RS resource uses FD-CDM2 multiplexing for CSI-RS resource mapping, where one such CDM group is illustrated as CDM group 334.

In one or more embodiments, for both first CSI-RS resources 330 and second CSI-RS resources 332 (e.g., resource #0 and #1) , different association between CSI-RS ports and polarizations of antenna elements are assumed for legacy UEs (e.g., no more than 32 CSI-RS ports) and UEs capable of an increased quantity of CSI-RS ports (e.g., more than 32 CSI-RS ports) . In some examples, the legacy CSI-RS resource is not capable of being shared with a legacy UE while maintaining good performance, for example because ports 3024-3047 map to a co-polarized array of antennas whereas the 24 port legacy codebook is designed and optimized for a cross polarized antenna array. Hence, a separate 24 port resource is be configured for the legacy UE if cross-polarized codebook properties are to be utilized, which increases the CSI-RS overhead and reduces performance.

In one or more example, for TDMed legacy CSI-RS resource aggregation (e.g., port assignments as described with reference to port assignment 302) may not be able to be shared, but CSI-RS resource aggregation (e.g., port assignments as described with reference to port assignment 303) can be used to create a shared resource (aggregated resources) .

Although described with reference to 12 subcarriers and 14 symbol periods, different numbers of subcarrier and/or symbol periods can be used in other examples, for example for different numerologies.

FIG. 4A shows an example port assignment 401, according to one or more aspects described herein. FIG. 4B shows an example port assignment 402, according to one or more aspects described herein. FIG. 4C shows an example port assignment 403, according to one or more aspects described herein. In one or more embodiments, port assignment 401, port assignment 402, and port assignment 403, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein.

The examples of port assignment 401, port assignment 402, and port assignment 403 is illustrated with reference to a resource block (RB) of 12 subcarriers and 14 symbol periods (e.g., a slot according to some configurations) . The example of port assignment 401 may have a port assignment mapping for CSI-RS port indexes 3000 through 3031 for one configuration and CSI-RS port indexes 3000 through 3031 for another configuration, according to the illustrated pattern (e.g., where only the last two digits are shown, such that 0 through 31 are illustrated for clarity) . The examples of port assignment 402 and port assignment 403 may have a port assignment mapping for CSI-RS port indexes 3000 through 3063 according to the illustrated pattern (e.g., where only the last two digits are shown, such that 0 through 63 are illustrated for clarity) .

In one or more embodiments, assuming a ‘X-port’ CSI-RS resource (e.g., more than 32 CSI-RS ports) is an aggregation of K, N-port legacy CSI-RS resources, the CSI-RS port number p^(k) using the k^th legacy CSI-RS resource are given as follows:

where n is the new port number allocated for thelegacy CSI-RS resource (e.g., CSI-RS resource with no more than 32 CSI-RS ports) ; k=0, 1, ..., K-1; K is the total number of aggregated legacy CSI-RS resources; and N is the total number of ports per aggregated legacy CSI-RS resource.

Example port assignment 401 depicts how the CSI-RS ports are indexed in a legacy configuration for each CSI-RS resource (which are not yet aggregated) . A first set of CSI-RS resources 410 according to a first configuration are port indexed for 32 ports in time and frequency as illustrated, and a second set of CSI-RS resources 412 according to a second configuration are port indexed for 32 ports in time and frequency as illustrated.

Example port assignment 402 depicts a CSI-port mapping in accordance with one or more embodiments described herein, for example with reference to the set of resources 301, port assignment 302, or port assignment 303. Port assignment 402 illustrates the mapping of 64 CSI-RS ports to resources of the first CSI-RS resources 420 and second CSI-RS resources 422 according to an aggregated configuration. In the example of port assignment 402, the first CSI-RS resources 420 and second CSI-RS resources 422 (e.g., legacy 32-ports CSI-RS resources #0 and #1) may not be able to be shared with legacy UEs, for example because as the legacy ports are map to a co-polarized array of antennas whereas the 32 port legacy codebook is designed and optimized for a cross polarized antenna array.

Example port assignment 403 depicts a CSI-port mapping for an aggregated set of CSI-RS resources in accordance with one or more embodiments described herein, where ports are mapped to the first CSI-RS resources 430 and the second CSI-RS resources 432 as shown. Port assignment 403 can allow, enable, or otherwise facilitate CSI-RS resource sharing between legacy UEs (e.g., having the capability and/or configuration to operate using up to, or no more than 32 CSI-RS ports) and non-legacy UEs (e.g., having the capability and/or configuration to operate using more than 32 CSI-RS ports (e.g., 48, 64, 96, 128, or more CSI-RS ports) ) .

In some embodiments, port assignment 403 can allow the sharing of resources with legacy UEs at least because the ports 32 through 47 (e.g., 3032 through 3047) can be assumed to be transmitted using X-polarization antenna elements. That is, for a UE configured with 64 ports for CSI-RS, can be associated with a first polarization (e.g., +45°) of the X-polarization antenna elements for the port indexes for the first set 441 and second set 442 of symbol periods and associated with a second polarization (e.g., -45°) of the X-polarization antenna elements for the port indexes of the third set 443 and fourth set 444 of symbol periods. This configuration can be consistent with a legacy UE configured with 32 ports for CSI-RS, which can be associated with a first polarization (e.g., +45°) of the X-polarization antenna elements for the port indexes of the first set 441 of symbol periods and associated with a second polarization (e.g., -45°) of the X-polarization antenna elements for the port indexes of the third set 443 of symbol periods.

According to port assignment 403, CSI-RS ports of the aggregated quantity of CSI-RS ports (e.g., 64 in the example of port assignment 403) may be first assigned (e.g., numerically from a lowest available port index value, such as 3000) to a first portion of first CSI-RS resources 430 in a first set 441 of one or more symbol periods (and over a set of frequency resources or subcarriers, for example within an RB or PRB) . CSI-RS ports may be then second assigned (e.g., numerically from a next lowest available port index value, such as 3016) to a first portion of second CSI-RS resources 432 in a second set 442 of one or more symbol periods (and over the set of frequency resources) . CSI-RS ports may be then third assigned (e.g., numerically from a next lowest available port index value, such as 3032) to a second portion of the first CSI-RS resources 430 in a third set 443 of one or more symbol periods (and over the set of frequency resources) . CSI-RS ports may be then fourth assigned (e.g., numerically from a next lowest available port index value, such as 3048) to a second portion of the second CSI-RS resources 432 in a fourth set 444 of one or more symbol periods (and over the set of frequency resources) . According to the example of port assignment 403, the third set 443 of one or more symbol periods follows the first set 441 of one or more symbol periods and precedes the second set 442 of one or more symbol periods. Similarly, the second set 442 of one or more symbol periods follows the third set 443 of one or more symbol periods and precedes the fourth set 444 of one or more symbol periods. Although described and illustrated with reference to particular symbol periods and subcarriers of an RB, other symbol periods, quantity of symbol periods in a set of symbol periods, subcarriers, subcarrier sets, and the spacings between symbol periods and/or subcarriers, consistent with the disclosure herein.

FIG. 5 shows an example method 500 of wireless communication by a UE. In one or more embodiments, method 500, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. In some cases, the UE may be the UE 102, wireless device 1202, or one of the other UEs described herein. The method 500 may be performed using a processor, a transceiver (or a main radio) , or other components of the UE.

At 502, the method 500 includes receiving configuration signaling that indicates common parameter values for a plurality of CSI-RS resource configurations associated with a plurality of CSI-RS ports, the plurality of CSI-RS resource configurations including at least a first CSI-RS resource configuration applicable to a first set of CSI-RS ports of the plurality of CSI-RS ports and a second CSI-RS resource configuration applicable to a second set of CSI-RS ports of the plurality of CSI-RS ports.

At 504, the method 500 includes receiving configuration signaling that indicates at least a first set of resource-specific parameter values for the first CSI-RS resource configuration and a second set of resource-specific parameter values for the second CSI-RS resource configuration.

At 506, the method 500 includes monitoring an aggregated set of CSI-RS resources in a slot, the aggregated set including a first set of CSI-RS resources and a second set of CSI-RS resources, where the first set of CSI-RS resources are determined based on the common parameter values and the first set of resource-specific parameter values, and the second set of resources are determined based on the common parameter values and the second set of resource-specific parameter values.

In one or more embodiments, the method further includes receiving an indication of a quantity of CSI-RS resource configurations of the plurality of CSI-RS resource configurations.

In some embodiments, the first set of CSI-RS ports is a same quantity of CS-RS ports as the second set of CSI-RS ports.

In some embodiments, the first set of CSI-RS ports is a first quantity of CSI-RS ports; and the second set of CSI-RS ports is a second quantity of CSI-RS ports that are different from the first quantity of CSI-RS ports.

In some embodiments, the common parameter values include one or more parameters including a scrambling identifier, a quasi-colocation information for periodic CSI-RS, a power control offset value between a CSI-RS and a downlink shared channel, or a power control offset between the CSI-RS and a synchronization signal block.

In some embodiments, the resource-specific parameter values include one or more parameters including a quantity of antenna ports, a frequency domain resource allocation, a time domain resource allocation, a code division multiplexing type, a periodicity, or a time offset.

In some embodiments, the configuration signaling that indicates the common parameter values and the configuration signaling that indicates the set of resource-specific parameter values includes radio resource control signaling.

In one or more embodiments, the method further includes transmitting control signaling including an indication that the UE is capable of being configured with the common parameter values and the set of resource-specific parameter values by transmitting an indication that the UE supports a quantity of antenna ports that is greater than thirty-two.

The method 500 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

FIG. 6 shows an example method 600 of wireless communication by a network device. In one or more embodiments, method 600, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. In some cases, the network device may be the network device 104, network device 1220, or one of the other network devices described herein. The method 600 may be performed using a processor, a transceiver (e.g., main radio) , or other components of the network device.

At 602, the method 600 includes identifying, for a UE, an aggregated set of CSI-RS resources for reference signals during a slot, the CSI-RS resources associated with a plurality of CSI-RS ports of the network device, the aggregated set of CSI-RS resources including at least a first set of resources and a second set of resources.

At 604, the method 600 includes transmitting, to the UE, configuration signaling that indicates common parameter values for a plurality of CSI-RS resource configurations associated with the plurality of CSI-RS ports, the plurality of CSI-RS resource configurations including at least a first CSI-RS resource configuration for the first set of resources and applicable to a first set of CSI-RS ports of the plurality of CSI-RS ports and a second CSI-RS resource configuration for the second set of resources and applicable to a second set of CSI-RS ports of the plurality of CSI-RS ports.

At 606, the method 600 includes transmitting, to the UE, configuration signaling that indicates at least a first set of resource-specific parameter values for the first CSI-RS resource configuration and a second set of resource-specific parameter values for the second CSI-RS resource configuration.

In one or more embodiments, the method further includes transmitting an indication of a quantity of CSI-RS resource configurations of the plurality of CSI-RS resource configurations.

In some embodiments, the common parameter values include one or more parameters including of a scrambling identifier, a quasi-colocation information for periodic CSI-RS, a power control offset value between a CSI-RS and a downlink shared channel, or a power control offset between the CSI-RS and a synchronization signal block.

In one or more embodiments, the method further includes receiving, from the UE, control signaling including an indication that the UE is capable of being configured with the common parameter values and the set of resource-specific parameter values by transmitting an indication that the UE supports a quantity of antenna ports that is greater than thirty-two.

The method 600 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

FIG. 7 shows an example method 700 of wireless communication by a UE. In one or more embodiments, method 700, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. In some cases, the UE may be the UE 102, wireless device 1202, or one of the other UEs described herein. The method 700 may be performed using a processor, a transceiver (or a main radio) , or other components of the UE.

At 702, the method 700 includes receiving configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports, and the first CSI-RS resource configuration having a first periodicity configuration that is one of aperiodic, periodic, or semi-persistent.

At 704, the method 700 includes receiving configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with the second set of the plurality of CSI-RS ports, and the second CSI-RS resource configuration having a second periodicity configuration that is one of aperiodic, periodic, or semi-persistent.

At 706, the method 700 includes monitoring an aggregated set of CSI-RS resources for reference signals in a slot, the aggregated set including a first set of CSI-RS resources and a second set of CSI-RS resources, where the first set of CSI-RS resources are determined based on the first periodicity configuration, and the second set of resources are determined based on the second periodicity configuration.

In some embodiments, the first periodicity and the second periodicity configurations are set to be a same one of aperiodic, periodic, or semi-persistent. In some embodiments, a periodicity configuration of the aggregated set of CSI-RS resources is periodic, which include the first set of CSI-RS resources with the first periodicity configuration being set as periodic, and the second set of CSI-RS resources with the second periodicity configuration being set as periodic. In some embodiments, a periodicity configuration of the aggregated set of CSI-RS resources is semi-persistent, which includes the first set of CSI-RS resources with the first periodicity configuration being set as semi-persistent, and the second set of CSI-RS resources with the second periodicity configuration being set as one of semi-persistent or periodic. In some embodiments, a periodicity configuration of the aggregated set of CSI-RS resources is aperiodic, which includes the first set of CSI-RS resources with the first periodicity is aperiodic, and the second set of CSI-RS resources with the second periodicity configuration being set as one of aperiodic, periodic or semi-persistent.

In one or more embodiments, the method further includes receiving a downlink control information message indicating for the UE to measure the first set of CSI-RS resources according to the first CSI-RS resource configuration; and determining, responsive to receiving the downlink control information message, that the UE is to measure the aggregated set of CSI-RS resources in the slot determined based on both the first CSI-RS configuration and the second CSI-RS configuration that is configured with a different periodicity configuration.

The method 700 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

FIG. 8 shows an example method 800 of wireless communication by a network device. In one or more embodiments, method 800, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. In some cases, the network device may be the network device 104, network device 1220, or one of the other network devices described herein. The method 800 may be performed using a processor, a transceiver (e.g., main radio) , or other components of the network device.

At 802, the method 800 includes transmitting, to a UE, configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports, and the first CSI-RS resource configuration having a first periodicity configuration that is one of aperiodic, periodic, or semi-persistent.

In one or more embodiments, the method further includes transmitting a DCI message indicating for the UE to monitor the first set of resources according to the first CSI-RS resource configuration, the DCI indicating for the UE to measure the aggregated set of CSI-RS resources in the slot determined based on both the first CSI-RS configuration and the second CSI-RS configuration that is configured with a different periodicity configuration.

The method 800 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

FIG. 9 shows an example method 900 of wireless communication by a UE. In one or more embodiments, method 900, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. In some cases, the UE may be the UE 102, wireless device 1202, or one of the other UEs described herein. The method 900 may be performed using a processor, a transceiver (or a main radio) , or other components of the UE.

At 902, the method 900 includes receiving configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports.

At 904, the method 900 includes receiving configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with a second set of the plurality of CSI-RS ports.

At 906, the method 900 includes determining an aggregated CSI-RS resource with a third set of the plurality of CSI-RS ports by including the first CSI-RS resource determined by the first CSI-RS resource configuration and the second CSI-RS resource determined by the second CSI-RS configuration, where the third set of plurality of CSI-RS ports is determined by summing the first and the second set of the plurality of CSI-RS ports.

At 908, the method 900 includes determining, based at least in part on the first CSI-RS resource configuration and the second CSI-RS resource configuration, an order of antenna port indexes for the third set of the plurality of CSI-RS ports for an aggregated set of CSI-RS resources in a slot.

At 910, the method 900 includes measuring the aggregated set of CSI-RS resources in the slot according to the determined order of CSI-RS antenna port indexing for the aggregated set of CSI-RS resources.

In some embodiments, determining the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources includes assigning, first to CSI-RS resource sets with the earliest starting symbol in an order of increasing frequency of the lowest subcarrier index in the slot and second in an order of increasing starting symbol indexes in the slot, the antenna port indexes to the aggregated set of CSI-RS resources.

In some embodiments, determining the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources includes assigning, first in an order of increasing frequency in the slot and second in an order of increasing symbol indexes in the slot, the antenna port indexes to the first CSI-RS resource; and assigning, after mapping antenna ports of the first CSI-RS resource, first in an order of increasing frequency in the slot and second in an order of increasing symbol indexes in the slot, the antenna port indexes to the second CSI-RS resource.

In some embodiments, determining the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources includes assigning first, first by frequency in the slot and second by time in the slot, the antenna port indexes to the first CSI-RS resource that are associated with a first antenna element polarization; assigning second, first by frequency in the slot and second by time in the slot, the antenna port indexes to the second CSI-RS resource that are associated with the first antenna element polarization; assigning third, first by frequency in the slot and second by time in the slot, the antenna port indexes to the first CSI-RS resource that are associated with a second antenna element polarization; and assigning fourth, first by frequency in the slot and second by time in the slot, the antenna port indexes to the second CSI-RS resource that are associated with the second antenna element polarization. In some embodiments, the first antenna element polarization is of a first set of antenna elements of an antenna array at a network device; and the second antenna element polarization is of a second set of antenna elements of the antenna array at a network device, where each antenna element of the first set of antenna elements is cross-polarized with an antenna element of the second set of antenna elements.

In some embodiments, the CSI-RS antenna port indexing further comprises:

where n is the new port number allocated for the (k=0, 1, ..., K-1) CSI-RS resource; K is the total number of aggregated CSI-RS resources; and N is the total number of antenna ports per aggregated CSI-RS resource.

The method 900 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

FIG. 10 shows an example method 1000 of wireless communication by a network device. In one or more embodiments, method 1000, supports one or more aspects of channel state information reference signal port indexing and mapping for wireless communication, as further described herein. In some cases, the network device may be the network device 104, network device 1220 or one of the other network devices described herein. The method 1000 may be performed using a processor, a transceiver (e.g., main radio) , or other components of the network device.

At 1002, the method 1000 includes transmitting, to a UE, configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports.

At 1004, the method 1000 includes transmitting, to the UE, configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with a second set of the plurality of CSI-RS ports.

At 1006, the method 1000 includes determining, based at least in part on the first CSI-RS resource configuration and the second CSI-RS resource configuration, an order of antenna port indexes for the plurality of CSI-RS ports for an aggregated set of CSI-RS resources in a slot.

At 1008, the method 1000 includes transmitting, using the plurality of CSI-RS ports, reference signals during a slot according to the determined order of antenna port indexing for the aggregated set of CSI-RS resources.

In some embodiments, determining the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources includes assigning, first in an order of increasing frequency in the slot and second in an order of increasing symbol indexes in the slot, the antenna port indexes to resources of the first CSI-RS resource configuration; and assigning, after mapping antenna ports to the first CSI-RS resource, first in an order of increasing frequency in the slot and second in an order of increasing symbol indexes in the slot, the antenna port indexes to the second CSI-RS resource.

In some embodiments, determining the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources includes: assigning first, first by frequency in the slot and second by time in the slot, the antenna port indexes to the first CSI-RS resource that are associated with a first antenna element polarization; assigning second, first by frequency in the slot and second by time in the slot, the antenna port indexes to the second CSI-RS resource that are associated with the first antenna element polarization; assigning third, first by frequency in the slot and second by time in the slot, the antenna port indexes to the first CSI-RS resource that are associated with a second antenna element polarization; and assigning fourth, first by frequency in the slot and second by time in the slot, the antenna port indexes to the second CSI-RS resource that are associated with the second antenna element polarization. In some embodiments, the first antenna element polarization is of a first set of antenna elements of an antenna array of the network device; and the second antenna element polarization is of a second set of antenna elements of the antenna array at a network device, where each antenna element of the first set of antenna elements is cross-polarized with an antenna element of the second set of antenna elements.

In some embodiments, the CSI-RS antenna port indexing further comprises:

The method 1000 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

Embodiments contemplated herein include one or more non-transitory computer-readable media storing instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of the methods 500 to 1000. In the context of methods 500, 700, or 900, this non-transitory computer-readable media may be, for example, a memory of a UE (such as a memory 1206 of a wireless device 1202 that is a UE, as described herein) . In the context of methods 600, 800, or 1000, this non-transitory computer-readable media may be, for example, a memory of a network device (such as a memory 1224 of a network device 1220, as described herein) .

Embodiments contemplated herein include an apparatus having logic, modules, or circuitry to perform one or more elements of the methods 500 to 1000. In the context of methods 500, 700, or 900, this apparatus may be, for example, an apparatus of a UE (such as a wireless device 1202 that is a UE) . In the context of methods 600, 800, or 1000, this apparatus may be, for example, an apparatus of a network device (such as a network device 1220, as described herein) .

Embodiments contemplated herein include an apparatus having one or more processors and one or more computer-readable media, using or storing instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of the methods 500 to 1000. In the context of methods 500, 700, or 900, this apparatus may be, for example, an apparatus of a UE (such as a wireless device 1202 that is a UE, as described herein) . In the context of the methods 600, 800, or 1000, this apparatus may be, for example, an apparatus of a network device (such as a network device 1220, as described herein) .

Embodiments contemplated herein include a signal as described in or related to one or more elements of the methods 500 to 1000.

Embodiments contemplated herein include a computer program or computer program product having instructions, wherein execution of the program by a processor causes the processor to carry out one or more elements of the methods 500 to 1000. In the context of methods 500, 700, or 900, the processor may be a processor of a UE (such as a processor (s) 1204 of a wireless device 1202 that is a UE, as described herein) , and the instructions may be, for example, located in the processor and/or on a memory of the UE (such as a memory 1206 of a wireless device 1202 that is a UE, as described herein) . In the context of methods 600, 800, or 1000, the processor may be a processor of a network device (such as a processor (s) 1222 of a network device 1220, as described herein) , and the instructions may be, for example, located in the processor and/or on a memory of the network device (such as a memory 1224 of a network device 1220, as described herein) .

FIG. 11 illustrates an example architecture of a wireless communication system, according to embodiments described herein. The following description is provided for an example wireless communication system 1100 that operates in conjunction with the LTE system standards or specifications and/or 5G or NR system standards or specifications, as provided by 3GPP technical specifications.

As shown, the wireless communication system 1100 includes UE 1102 and UE 1104 (although any number of UEs may be used) . In this example, the UE 1102 and the UE 1104 are illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks) but may also comprise any mobile or non-mobile computing device configured for wireless communication.

The UE 1102 and UE 1104 may be configured to communicatively couple with a RAN 1106. In embodiments, the RAN 1106 may be NG-RAN, E-UTRAN, etc. The UE 1102 and UE 1104 utilize connections (or channels) (shown as connection 1108 and connection 1110, respectively) with the RAN 1106, each of which comprises a physical communications interface. The RAN 1106 can include one or more network devices, such as base station 1112 and base station 1114, that enable the connection 1108 and connection 1110.

In this example, the connection 1108 and connection 1110 are air interfaces to enable such communicative coupling and may be consistent with RAT (s) used by the RAN 1106, such as, for example, an LTE and/or NR.

In some embodiments, the UE 1102 and UE 1104 may also directly exchange communication data via a sidelink interface 1116. The UE 1104 is shown to be configured to access an access point (shown as AP 1118) via connection 1120. By way of example, the connection 1120 can comprise a local wireless connection, such as a connection consistent with any IEEE 802.11 protocol, wherein the AP 1118 may comprise a router. In this example, the AP 1118 may be connected to another network (for example, the Internet) without going through a CN 1124.

In embodiments, the UE 1102 and UE 1104 can be configured to communicate using orthogonal frequency division multiplexing (OFDM) communication signals with each other or with the base station 1112 and/or the base station 1114 over a multicarrier communication channel in accordance with various communication techniques, such as, but not limited to, an orthogonal frequency division multiple access (OFDMA) communication technique (e.g., for downlink communications) or a single carrier frequency division multiple access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink communications) , although the scope of the embodiments is not limited in this respect. The OFDM signals can comprise a plurality of orthogonal subcarriers.

In some embodiments, all or parts of the base station 1112 or base station 1114 may be implemented as one or more software entities running on server computers as part of a virtual network. In addition, or in other embodiments, the base station 1112 or base station 1114 may be configured to communicate with one another via interface 1122. In embodiments where the wireless communication system 1100 is an LTE system (e.g., when the CN 1124 is an EPC) , the interface 1122 may be an X2 interface. The X2 interface may be defined between two or more network devices of a RAN (e.g., two or more eNBs and the like) that connect to an EPC, and/or between two eNBs connecting to the EPC. In embodiments where the wireless communication system 1100 is an NR system (e.g., when CN 1124 is a 5GC) , the interface 1122 may be an Xn interface. The Xn interface is defined between two or more network devices of a RAN (e.g., two or more gNBs and the like) that connect to the 5GC, between a base station 1112 (e.g., a gNB) connecting to the 5GC and an eNB, and/or between two eNBs connecting to the 5GC (e.g., CN 1124) .

The RAN 1106 is shown to be communicatively coupled to the CN 1124. The CN 1124 may comprise one or more network elements 1126, which are configured to offer various data and telecommunications services to customers/subscribers (e.g., users of UE 1102 and UE 1104) who are connected to the CN 1124 via the RAN 1106. The components of the CN 1124 may be implemented in one physical device or separate physical devices including components to read and execute instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium) .

In embodiments, the CN 1124 may be an EPC, and the RAN 1106 may be connected with the CN 1124 via an S1 interface 1128. In embodiments, the S1 interface 1128 may be split into two parts, an S1 user plane (S1-U) interface, which carries traffic data between the base station 1112 or base station 1114 and a serving gateway (S-GW) , and the S1-MME interface, which is a signaling interface between the base station 1112 or base station 1114 and mobility management entities (MMEs) .

In embodiments, the CN 1124 may be a 5GC, and the RAN 1106 may be connected with the CN 1124 via an NG interface 1128. In embodiments, the NG interface 1128 may be split into two parts, an NG user plane (NG-U) interface, which carries traffic data between the base station 1112 or base station 1114 and a user plane function (UPF) , and the S1 control plane (NG-C) interface, which is a signaling interface between the base station 1112 or base station 1114 and access and mobility management functions (AMFs) .

Generally, an application server 1130 may be an element offering applications that use internet protocol (IP) bearer resources with the CN 1124 (e.g., packet switched data services) . The application server 1130 can also be configured to support one or more communication services (e.g., VoIP sessions, group communication sessions, etc. ) for the UE 1102 and UE 1104 via the CN 1124. The application server 1130 may communicate with the CN 1124 through an IP communications interface 1132.

FIG. 12 illustrates an example system 1200 for performing the signaling 1238 between a wireless device 1202 and a network device 1220, according to embodiments described herein. The system 1200 may be a portion of a wireless communication system as herein described. The wireless device 1202 may be, for example, a UE of a wireless communication system. The network device 1220 may be, for example, a base station (e.g., an eNB or a gNB) or a radio head of a wireless communication system.

The wireless device 1202 may include one or more processor (s) 1204. The processor (s) 1204 may execute instructions such that various operations of the wireless device 1202 are performed, as described herein. The processor (s) 1204 may include one or more baseband processors implemented using, for example, a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.

The wireless device 1202 may include a memory 1206. The memory 1206 may be a non-transitory computer-readable storage medium that stores instructions 1208 (which may include, for example, the instructions being executed by the processor (s) 1204) . The instructions 1208 may also be referred to as program code or a computer program. The memory 1206 may also store data used by, and results computed by, the processor (s) 1204.

The wireless device 1202 may include one or more transceiver (s) 1210 (also collectively referred to as a transceiver 1210) that may include radio frequency (RF) transmitter and/or receiver circuitry that use the antenna (s) 1212 of the wireless device 1202 to facilitate signaling (e.g., the signaling 1238) to and/or from the wireless device 1202 with other devices (e.g., the network device 1220) according to corresponding RATs.

The wireless device 1202 may include one or more antenna (s) 1212 (e.g., one, two, four, eight, or more) . For embodiments with multiple antenna (s) 1212, the wireless device 1202 may leverage the spatial diversity of such multiple antenna (s) 1212 to send and/or receive multiple different data streams on the same time and frequency resources. This behavior may be referred to as, for example, MIMO behavior (referring to the multiple antennas used at each of a transmitting device and a receiving device that enable this aspect) . MIMO transmissions by the wireless device 1202 may be accomplished according to precoding (or digital beamforming) that is applied at the wireless device 1202 that multiplexes the data streams across the antenna (s) 1212 according to known or assumed channel characteristics such that each data stream is received with an appropriate signal strength relative to other streams and at a desired location in the spatial domain (e.g., the location of a receiver associated with that data stream) . Some embodiments may use single user MIMO (SU-MIMO) methods (where the data streams are all directed to a single receiver) and/or multi-user MIMO (MU-MIMO) methods (where individual data streams may be directed to individual (different) receivers in different locations in the spatial domain) .

In some embodiments having multiple antennas, the wireless device 1202 may implement analog beamforming techniques, whereby phases of the signals sent by the antenna (s) 1212 are relatively adjusted such that the (joint) transmission of the antenna (s) 1212 can be directed (this is sometimes referred to as beam steering) .

The wireless device 1202 may include one or more interface (s) 1216. The interface (s) 1216 may be used to provide input to or output from the wireless device 1202. For example, a wireless device 1202 that is a UE may include interface (s) 1216 such as microphones, speakers, a touchscreen, buttons, and the like in order to allow for input and/or output to the UE by a user of the UE. Other interfaces of such a UE may be made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 1210/antenna (s) 1212 already described) that allow for communication between the UE and other devices and may operate according to known protocols (e.g., and the like) .

The wireless device 1202 may include CSI-RS resource manager 1218. The CSI-RS resource manager 1218 may be implemented via hardware, software, or combinations thereof. For example, the CSI-RS resource manager 1218 may be implemented as a processor, circuit, and/or instructions 1208 stored in the memory 1206 and executed by the processor (s) 1204. In some examples, the CSI-RS resource manager 1218 may be integrated within the processor (s) 1204 and/or the transceiver (s) 1210. For example, the CSI-RS resource manager 1218 may be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor (s) 1204 or the transceiver (s) 1210.

The CSI-RS resource manager 1218 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-12, from a wireless device or UE perspective. The CSI-RS resource manager 1218 may be configured to, for example, perform receiving configuration signaling that indicates common parameter values for a plurality of CSI-RS resource configurations associated with a plurality of CSI-RS ports, the plurality of CSI-RS resource configurations including at least a first CSI-RS resource configuration applicable to a first set of CSI-RS ports of the plurality of CSI-RS ports and a second CSI-RS resource configuration applicable to a second set of CSI-RS ports of the plurality of CSI-RS ports; receiving configuration signaling that indicates at least a first set of resource-specific parameter values for the first CSI-RS resource configuration and a second set of resource-specific parameter values for the second CSI-RS resource configuration; monitoring an aggregated set of CSI-RS resources in a slot, the aggregated set including a first set of CSI-RS resources and a second set of CSI-RS resources, where the first set of CSI-RS resources are determined based the common parameter values and the first set of resource-specific parameter values, and the second set of resources are determined based on the common parameter values and the second set of resource-specific parameter values.

Additionally or alternatively, the CSI-RS resource manager 1218 may be configured to, for example, perform receiving configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports, and the first CSI-RS resource configuration having a first periodicity configuration that is one of aperiodic, periodic, or semi-persistent; receiving configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with the second set of the plurality of CSI-RS ports, and the second CSI-RS resource configuration having a second periodicity configuration that is one of aperiodic, periodic, or semi-persistent; monitoring an aggregated set of CSI-RS resources for reference signals in a slot, the aggregated set including a first set of CSI-RS resources and a second set of CSI-RS resources, where the first set of CSI-RS resources are determined based on the first periodicity configuration, and the second set of resources are determined based on the second periodicity configuration.

Additionally or alternatively, the CSI-RS resource manager 1218 may be configured to, for example, perform receiving configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports; receiving configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with a second set of the plurality of CSI-RS ports; determining an aggregated CSI-RS resource with a third set of the plurality of CSI-RS ports by including the first CSI-RS resource determined by the first CSI-RS resource configuration and the second CSI-RS resource determined by the second CSI-RS configuration, where the third set of plurality of CSI-RS ports is determined by summing the first and the second set of the plurality of CSI-RS ports; determining, based at least in part on the first CSI-RS resource configuration and the second CSI-RS resource configuration, an order of antenna port indexes for the third set of the plurality of CSI-RS ports for an aggregated set of CSI-RS resources in a slot; and measuring the aggregated set of CSI-RS resources in the slot according to the determined order of CSI-RS antenna port indexing for the aggregated set of CSI-RS resources.

The network device 1220 may include one or more processor (s) 1222. The processor (s) 1222 may execute instructions such that various operations of the network device 1220 are performed, as described herein. The processor (s) 1222 may include one or more baseband processors implemented using, for example, a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.

The network device 1220 may include a memory 1224. The memory 1224 may be a non-transitory computer-readable storage medium that stores instructions 1226 (which may include, for example, the instructions being executed by the processor (s) 1222) . The instructions 1226 may also be referred to as program code or a computer program. The memory 1224 may also store data used by, and results computed by, the processor (s) 1222.

The network device 1220 may include one or more transceiver (s) 1228 (also collectively referred to as a transceiver 1228) that may include RF transmitter and/or receiver circuitry that use the antenna (s) 1230 of the network device 1220 to facilitate signaling (e.g., the signaling 1238) to and/or from the network device 1220 with other devices (e.g., the wireless device 1202) according to corresponding RATs.

The network device 1220 may include one or more antenna (s) 1230 (e.g., one, two, four, or more) . In embodiments having multiple antenna (s) 1230, the network device 1220 may perform MIMO, digital beamforming, analog beamforming, beam steering, etc., as has been described.

The network device 1220 may include one or more interface (s) 1232. The interface (s) 1232 may be used to provide input to or output from the network device 1220. For example, a network device 1220 of a RAN (e.g., a base station, a radio head, etc. ) may include interface (s) 1232 made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 1228/antenna (s) 1230 already described) that enables the network device 1220 to communicate with other equipment in a network, and/or that enables the network device 1220 to communicate with external networks, computers, databases, and the like for purposes of operations, administration, and maintenance of the network device 1220 or other equipment operably connected thereto.

The network device 1220 may include at least one of CSI-RS resource manager 1234. The CSI-RS resource manager 1234 may be implemented via hardware, software, or combinations thereof. For example, the CSI-RS resource manager 1234 may be implemented as a processor, circuit, and/or instructions 1226 stored in the memory 1224 and executed by the processor (s) 1222. In some examples, the CSI-RS resource manager 1234 may be integrated within the processor (s) 1222 and/or the transceiver (s) 1228. For example, the CSI-RS resource manager 1234 may be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor (s) 1222 or the transceiver (s) 1228.

The CSI-RS resource manager 1234 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-12, from a network device perspective. The CSI-RS resource manager 1234 may be configured to, for example, perform identifying, for a UE, an aggregated set of CSI-RS resources for reference signals during a slot, the CSI-RS resources associated with a plurality of CSI-RS ports of the network device, the aggregated set of CSI-RS resources including at least a first set of resources and a second set of resources; transmitting, to the UE, configuration signaling that indicates common parameter values for a plurality of CSI-RS resource configurations associated with the plurality of CSI-RS ports, the plurality of CSI-RS resource configurations including at least a first CSI-RS resource configuration for the first set of resources and applicable to a first set of CSI-RS ports of the plurality of CSI-RS ports and a second CSI-RS resource configuration for the second set of resources and applicable to a second set of CSI-RS ports of the plurality of CSI-RS ports; transmitting, to the UE, configuration signaling that indicates at least a first set of resource-specific parameter values for the first CSI-RS resource configuration and a second set of resource-specific parameter values for the second CSI-RS resource configuration.

Additionally or alternatively, the CSI-RS resource manager 1234 may be configured to, for example, perform receiving configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports, and the first CSI-RS resource configuration having a first periodicity configuration that is one of aperiodic, periodic, or semi-persistent; receiving configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with the second set of the plurality of CSI-RS ports, and the second CSI-RS resource configuration having a second periodicity configuration that is one of aperiodic, periodic, or semi-persistent; monitoring an aggregated set of CSI-RS resources for reference signals during a slot, the aggregated set including a first set of resources monitored according to the first CSI-RS resource configuration and the first periodicity, and the aggregated set including a second set of resources monitored according to the second CSI-RS resource configuration and the second periodicity.

Additionally or alternatively, the CSI-RS resource manager 1234 may be configured to, for example, perform transmitting, to a UE, configuration signaling indicating a first CSI-RS resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports; transmitting, to the UE, configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with a second set of the plurality of CSI-RS ports; determining, based at least in part on the first CSI-RS resource configuration and the second CSI-RS resource configuration, an order of antenna port indexes for the plurality of CSI-RS ports for an aggregated set of CSI-RS resources in a slot; transmitting, using the plurality of CSI-RS ports, reference signals during a slot according to the determined order of antenna port indexing for the aggregated set of CSI-RS resources.

For one or more embodiments, at least one of the components set forth in one or more of the preceding figures may be configured to perform one or more operations, techniques, processes, and/or methods as set forth herein. For example, a baseband processor (or processor) as described herein in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein. For another example, circuitry associated with a UE, network device, network element, etc. as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein.

Any of the above described embodiments may be combined with any other embodiment (or combination of embodiments) , unless explicitly stated otherwise. The foregoing description of one or more implementations provides illustration and description but is not intended to be exhaustive or to limit the scope of embodiments to the precise form described. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various embodiments.

Embodiments and implementations of the systems and methods described herein may include various operations, which may be embodied in machine-executable instructions to be executed by a computer system. A computer system may include one or more general-purpose or special-purpose computers (or other electronic devices) . The computer system may include hardware components that include specific logic for performing the operations or may include a combination of hardware, software, and/or firmware.

The systems described herein pertain to specific embodiments but are provided as examples. These embodiments can be combined into single systems, partially combined into other systems, split into multiple systems or divided or combined in other ways. In addition, it is contemplated that parameters, attributes, aspects, etc. of one embodiment can be used in another embodiment. The parameters, attributes, aspects, etc. are merely described in one or more embodiments for clarity, and it is recognized that the parameters, attributes, aspects, etc. can be combined with or substituted for parameters, attributes, aspects, etc. of another embodiment unless specifically disclaimed herein.

Although the foregoing has been described in some detail for purposes of clarity, it will be apparent that changes and modifications may be made without departing from the principles thereof. It should be noted that there are many alternative ways of implementing both the processes and apparatuses described herein. Accordingly, the present embodiments are to be considered illustrative and not restrictive, and the description is not to be limited to the details given herein but may be modified within the scope and equivalents of the appended claims.

Claims

A processor configured to:

receive, via a transceiver, configuration signaling that indicates common parameter values for a plurality of channel state information reference signal (CSI-RS) resource configurations associated with a plurality of CSI-RS ports, the plurality of CSI-RS resource configurations including at least a first CSI-RS resource configuration applicable to a first set of CSI-RS ports of the plurality of CSI-RS ports and a second CSI-RS resource configuration applicable to a second set of CSI-RS ports of the plurality of CSI-RS ports;

receive, via the transceiver, configuration signaling that indicates at least a first set of resource-specific parameter values for the first CSI-RS resource configuration and a second set of resource-specific parameter values for the second CSI-RS resource configuration; and

monitor an aggregated set of CSI-RS resources in a slot, the aggregated set including a first set of CSI-RS resources and a second set of CSI-RS resources, where the first set of CSI-RS resources are determined based on the common parameter values and the first set of resource-specific parameter values, and the second set of resources are determined based on the common parameter values and the second set of resource-specific parameter values.
The processor of claim 1, further configured to:

receive, via the transceiver, an indication of a quantity of CSI-RS resource configurations of the plurality of CSI-RS resource configurations.
The processor of claim 1, wherein the first set of CSI-RS ports is a same quantity of CS-RS ports as the second set of CSI-RS ports.
The processor of claim 1, wherein:

the first set of CSI-RS ports is a first quantity of CSI-RS ports; and

the second set of CSI-RS ports is a second quantity of CSI-RS ports that are different from the first quantity of CSI-RS ports.
The processor of claim 1, wherein the common parameter values comprise one or more parameters including a scrambling identifier, a quasi-colocation information for periodic CSI-RS, a power control offset value between a CSI-RS and a downlink shared channel, or a power control offset between the CSI-RS and a synchronization signal block.
The processor of claim 1, wherein:

the resource-specific parameter values comprise one or more parameters including a quantity of antenna ports, a frequency domain resource allocation, a time domain resource allocation, a code division multiplexing type, a periodicity, or a time offset.
The processor of claim 1, wherein:

the configuration signaling that indicates the common parameter values and the configuration signaling that indicates the set of resource-specific parameter values comprises radio resource control signaling.
A user equipment (UE) , comprising:

a transceiver; and

a processor configured to cause the UE to,

receive configuration signaling indicating a first channel state information reference signal (CSI-RS) resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports, and the first CSI-RS resource configuration having a first periodicity configuration that is one of aperiodic, periodic, or semi-persistent;

receive configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with the second set of the plurality of CSI-RS ports, and the second CSI-RS resource configuration having a second periodicity configuration that is one of aperiodic, periodic, or semi-persistent; and

monitor an aggregated set of CSI-RS resources for reference signals in a slot, the aggregated set including a first set of CSI-RS resources and a second set of CSI-RS resources, where the first set of CSI-RS resources are determined based on the first periodicity configuration, and the second set of resources are determined based on the second periodicity configuration.
The UE of claim 10, wherein the first periodicity and the second periodicity configurations are set to be a same one of aperiodic, periodic, or semi-persistent.
The UE of claim 10, wherein a periodicity configuration of the aggregated set of CSI-RS resources is periodic, which include the first set of CSI-RS resources with the first periodicity configuration being set as periodic, and the second set of CSI-RS resources with the second periodicity configuration being set as periodic.
The UE of claim 10, wherein a periodicity configuration of the aggregated set of CSI-RS resources is semi-persistent, which includes the first set of CSI-RS resources with the first periodicity configuration being set as semi-persistent, and the second set of CSI-RS resources with the second periodicity configuration being set as one of semi-persistent or periodic.
The UE of claim 10, wherein a periodicity configuration of the aggregated set of CSI-RS resources is aperiodic, which includes the first set of CSI-RS resources with the first periodicity is aperiodic, and the second set of CSI-RS resources with the second periodicity configuration being set as one of aperiodic, periodic or semi-persistent.
The UE of claim 10, wherein the processor is further configured to cause the UE to:

receive a downlink control information message indicating for the UE to measure the first set of CSI-RS resources according to the first CSI-RS resource configuration; and

determine, responsive to receiving the downlink control information message, that the UE is to measure the aggregated set of CSI-RS resources in the slot determined based on both the first CSI-RS configuration and the second CSI-RS configuration that is configured with a different periodicity configuration.
A user equipment (UE) , comprising:

a transceiver; and

a processor configured to cause the UE to,

receive configuration signaling indicating a first channel state information reference signal (CSI-RS) resource configuration of a plurality of CSI-RS resource configurations, the first CSI-RS resource configuration associated with a first set of a plurality of CSI-RS ports;

receive configuration signaling indicating a second CSI-RS resource configuration of the plurality of CSI-RS resource configurations, the second CSI-RS resource configuration associated with a second set of the plurality of CSI-RS ports;

determine an aggregated CSI-RS resource with a third set of the plurality of CSI-RS ports by including the first CSI-RS resource determined by the first CSI-RS resource configuration and the second CSI-RS resource determined by the second CSI-RS configuration, where the third set of plurality of CSI-RS ports is determined by summing the first and the second set of the plurality of CSI-RS ports;

determine, based at least in part on the first CSI-RS resource configuration and the second CSI-RS resource configuration, an order of antenna port indexes for the third set of the plurality of CSI-RS ports for an aggregated set of CSI-RS resources in a slot; and

measure the aggregated set of CSI-RS resources in the slot according to the determined order of CSI-RS antenna port indexing for the aggregated set of CSI-RS resources.
The UE of claim 16, wherein the processor is configured to cause the UE to determine the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources by being configured to cause the UE to:

assign, first to CSI-RS resource sets with the earliest starting symbol in an order of increasing frequency of the lowest subcarrier index in the slot and second in an order of increasing starting symbol indexes in the slot, the antenna port indexes to the aggregated set of CSI-RS resources.
The UE of claim 16, wherein the processor is configured to cause the UE to determine the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources by being configured to cause the UE to:

assign, first in an order of increasing frequency in the slot and second in an order of increasing symbol indexes in the slot, the antenna port indexes to the first CSI-RS resource; and

assign, after mapping antenna ports to the first CSI-RS resource, first in an order of increasing frequency in the slot and second in an order of increasing symbol indexes in the slot, the antenna port indexes to the second CSI-RS resource.
The UE of claim 16, wherein the processor is configured to cause the UE to determine the order of CSI-RS antenna port indexes in the aggregated set of CSI-RS resources by being configured to cause the UE to:

assign first, first by frequency in the slot and second by time in the slot, the antenna port indexes to the first CSI-RS resource that are associated with a first antenna element polarization; and

assign second, first by frequency in the slot and second by time in the slot, the antenna port indexes to the second CSI-RS resource that are associated with the first antenna element polarization;

assign third, first by frequency in the slot and second by time in the slot, the antenna port indexes to the first CSI-RS resource that are associated with a second antenna element polarization; and

assign fourth, first by frequency in the slot and second by time in the slot, the antenna port indexes to the second CSI-RS resource that are associated with the second antenna element polarization.
The UE of claim 18, wherein the CSI-RS antenna port indexing further comprises:

where n is the new port number allocated for theCSI-RS resource; K is the total number of aggregated CSI-RS resources; and N is the total number of antenna ports per aggregated CSI-RS resource.
The UE of claim 19, wherein:

the first antenna element polarization is of a first set of antenna elements of an antenna array at a network device; and

the second antenna element polarization is of a second set of antenna elements of the antenna array at a network device, wherein each antenna element of the first set of antenna elements is cross-polarized with an antenna element of the second set of antenna elements.