WO2018063843A1

WO2018063843A1 - Channel state information (csi) reporting for multiple input multiple output (mimo)

Info

Publication number: WO2018063843A1
Application number: PCT/US2017/052080
Authority: WO
Inventors: Alexei Davydov; Gregory Morozov; Victor SERGEEV
Original assignee: Intel Corporation
Priority date: 2016-09-29
Filing date: 2017-09-18
Publication date: 2018-04-05

Abstract

Embodiments of the present disclosure relate to identification of channel state information (CSI) related to a first and second full dimension multiple input multiple output (FD-MIMO) type. The FD-MIMO types may be based on different classes of FD-MIMO, or they may be based on beamforming of the CSI reference signal (CSI-RS) related to the CSI. Embodiments may further relate to transmission of the CSI in periodic or aperiodic reports. Other embodiments may be described or claimed.

Description

CHANNEL STATE INFORMATION (CSI) REPORTING FOR MULTIPLE INPUT

MULTIPLE OUTPUT (MIMO)

Related Application

This application claims priority to U.S. Provisional Application Number 62/401,438, filed September 29, 2016, and U.S. Provisional Application Number 62/410,739, filed October 20, 2016, both of which are hereby incorporated by reference in their entirety.

Field

Embodiments of the present disclosure generally relate to the field of wireless networks, and more particularly, to apparatuses, systems, and methods for channel state information (CSI) reporting in networks that utilize multiple input multiple output (MIMO).

Background

The following detailed description refers to the accompanying drawings. The same reference numbers may be used in different drawings to identify the same or similar elements. In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular structures, architectures, interfaces, techniques, etc. in order to provide a thorough understanding of the various aspects of various embodiments. However, it will be apparent to those skilled in the art having the benefit of the present disclosure that the various aspects of the various embodiments may be practiced in other examples that depart from these specific details. In certain instances, descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the various embodiments with unnecessary detail.

MIMO may refer to a technology wherein a wireless signal is sent by a transmitter using two or more transmit antennas, and received by a receiver using two or more receive antennas. MIMO may increase throughput and efficiency of wireless transmissions. Additionally, MIMO may provide for beamforming, wherein specific communications may be targeted from a transmitter to a receive in a specific geographical direction.

Release 13 (Rel-13) Long Term Evolution Advanced (LTE-A) of the third generation partnership project (3GPP) specifications describe full dimension MIMO (FD-MIMO). In FD-MIMO, the beamforming may occur in both a lateral plane (which may be referred to as an azimuth or horizontal) and a vertical plane (which may be referred to as an elevation). FD-MIMO may alternatively be referred to as enhanced MIMO (eMIMO). Rel-13 specified two classes of FD-MIMO schemes - Class A and Class B. In Class A, a base station transmits a non-precoded channel state information reference signal (CSI-RS). The user equipment (UE) then transmits CSI-feedback in Class A FD-MIMO using channel measurement from the CSI-RS and a configurable dual-codebook. The codebook may be, for example, designed to support various one dimensional (ID) or two dimensional (2D) antenna port layouts. In Class B, the CSI-RS may be beamformed by the base station. The CSI feedback may be derived using channel measurement from the beam formed CSI-RS and a codebook that may support ID or 2D antenna port layouts.

Brief Description of the Drawings

Embodiments will be readily understood by the following detailed description in conjunction with the accompanying drawings. To facilitate this description, like reference numerals designate like structural elements. Embodiments are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings.

Figure 1 depicts an example system, in accordance with various embodiments.

Figures 2a, 2b, and 2c depict examples of CSI-RS transmission in FD-MIMO, in accordance with various embodiments.

Figure 3 depicts an example process flow for CSI feedback reporting, in accordance with various embodiments.

Figure 4 depicts an alternative example process low for CSI feedback reporting, in accordance with various embodiments.

Figure 5 depicts an example device, in accordance with various embodiments.

Figure 6 depicts example hardware resources, in accordance with various embodiments.

Detailed Description

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof wherein like numerals designate like parts throughout, and in which is shown by way of illustration embodiments that may be practiced. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. Various operations may be described as multiple discrete actions or operations in turn, in a manner that is most helpful in understanding the claimed subject matter. However, the order of description should not be construed as to imply that these operations are necessarily order dependent. In particular, these operations may not be performed in the order of presentation. Operations described may be performed in a different order than the described embodiment. Various additional operations may be performed or described operations may be omitted in additional embodiments.

For the purposes of the present disclosure, the phrases "A or B," "A and/or B," and "A/B" mean (A), (B), or (A and B).

The description may use the phrases "in an embodiment," or "in embodiments," which may each refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," and the like, as used with respect to embodiments of the present disclosure, are synonymous.

Embodiments herein are generally described using the term "base station." As used herein, a "base station" may refer to a third generation partnership project (3GPP) evolved NodeB (eNB), a 3GPP new radio (NR) (which may alternatively be referred to as fifth generation (5G)) NodeB (gNB), a serving cell, or some other transmission point that is in radio communication with a user equipment (UE).

In some embodiments hybrid FD-MIMO operation with both Class A and Class B FD- MIMO configured at the same time may be desirable. Generally, in hybrid FD-MIMO, the beamformed CSI-RS Class B scheme may be utilized in conjunction with the non- precoded CSI-RS Class A scheme. In this case, beamforming applied by a serving base station to generate a beamformed CSI-RS may be derived based on CSI reporting from the UE based on the Class A scheme. For example, Class A and Class B FD-MIMO may be configured for different CSI processes in transmission mode 10 (TM10). The precoding matrix indicator (PMI) report provided for Class A FD-MIMO can be used to identify the candidate beams for CSI-RS transmission in accordance with Class B FD-MIMO.

Embodiments herein relate to different techniques that may be used to support hybrid FD- MIMO. In one embodiment, CSI feedback from the UE may be configured differently between periodic and aperiodic reporting. As used herein, "periodic" reporting may refer to reporting that is carried by the physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or some other physical uplink channel (e.g., the enhanced PUCCH (ePUCCH), enhanced PUSCH (ePUSCH), etc.). The periodic reporting may be configured by a higher layer signal received from the base station that may include details as to the timing and/or resources which the UE should use to send the periodic report. The periodicity of the periodic report may be, for example, subframe by subframe, frame by frame, slot by slot, or some other periodicity.

By contrast, as used herein, "aperiodic" reporting may refer to reporting that is carried on the PUSCH, the ePUSCH, or some other physical uplink channel. The aperiodic report may be transmitted by the UE upon receipt of a request for the aperiodic report from the base station. The request may be received, for example, in downlink control information (DCI) received from the base station . Generally, the aperiodic report may only be transmitted in a single instance, where the periodic report may be a recurring periodic transmission.

In one embodiment the periodic CSI reports can be related to Class A FD-MIMO transmissions. Specifically, the periodic CSI reports can be configured to provide the base station with a PMI report related to the Class A FD-MIMO CSI-RS transmissions as described above. In some embodiments, the periodic reports can omit other elements of Class A FD-MIMO CSI reports such as a W2 report or channel quality information (CQI) reporting. By contrast, the aperiodic CSI report may related to Class B FD-MIMO CSI-RS transmissions as described above.

In this embodiment, the CSI-RS resources may be configured differently between the periodic and aperiodic reports. For example, the UE may use up to 8 antenna ports to transmit an aperiodic report, whereas the UE may use up to 32 antenna ports to transmit the periodic report. Generally, the smaller number of CSI-RS antenna ports for aperiodic CSI reporting may be due to use of beamforming at the base station, which may be derived from a periodic CSI report to transmit the beamformed CSI-RS. The beamformed CSI-RS transmission may improve the accuracy of channel measurements, and therefore CSI reports, due to beamforming gain.

Additionally, as noted above, if the periodic report is related to a Class A MIMO CSI-RS transmission, then the periodic report may be transmitted using a codebook that relates to non- precoded CSI-RS. By contrast if the aperiodic report is related to Class B FD-MIMO CSI-RS transmissions, then the aperiodic report may be transmitted using a codebook that relates to a beamformed CSI-RS.

In another embodiment, Class B FD-MIMO transmissions may include either a single beamformed CSI-RS (which may be referred to as K=l) or a plurality of beamformed CSI-RSs (which may be referred to as K>1). In some embodiments, CSI feedback related to the K=l Class B FD-MIMO transmission may be transmitted in an aperiodic report, while the CSI feedback related to the K>1 Class B FD-MIMO transmission may be transmitted in a periodic report. Similarly to the previous embodiment, the W2 report or CQI reporting may be omitted from the periodic report.

In another embodiment, aperiodic reports may be transmitted for both Class A and Class B FD-MIMO CSI-RS transmissions. However, in some embodiments only one of the two aperiodic CSI reports may be updated. For example, in one embodiment the UE may identify whether the CSI report related to the Class A or Class B FD-MIMO CS-RS transmissions has had the bigger change since a previous CSI report. If the Class A FD- MIMO CSI report has changed (as compared to a previous Class A FD-MIMO CSI report) more than the Class B FD-MIMO CSI report has changed (as compared to a previous Class B FD-MIMO CSI report), then the UE may only update the Class A FD-MIMO CSI report. Similarly, if the Class B FD-MIMO CSI report has changed (as compared to a previous Class B FD-MIMO CSI report) more than the Class A FD-MIMO CSI report has changed (as compared to a previous Class A FD-MIMO CSI report), then the UE may update only the Class B FD-MIMO CSI report. Both reports (e.g., the updated report and the non-updated report) may then be transmitted as aperiodic reports. Notably, in this embodiment, some elements such as W2 or CQI reporting may not be included in the Class A FD-MIMO CSI report.

In another embodiment, the identification of whether to update the Class A or Class B FD- MIMO CSI report may be based on a different factor such as whether the last FD-MIMO CSI report was related to the Class A or Class B FD-MIMO CSI-RS. For example, if the last CSI report was related to the Class A FD-MIMO CSI-RS, then the UE may update the Class B FD-MIMO CSI report and not update the Class A FD-MIMO CSI report.

Alternatively, if the last CSI report was related to the Class B FD-MIMO CSI-RS, then the UE may update the Class A FD-MIMO CSI report and not update the Class B FD-MIMO CSI report. Both reports (e.g., the updated report and the non-updated report) may then be transmitted as aperiodic reports. Similarly to above, some elements such as W2 or CQI reporting may not be included in the Class A FD-MIMO CSI report.

It will be understood that these factors are intended merely as examples, and in other embodiments the UE may include one or more additional factors in the consideration of whether to update the Class A or Class B FD-MIMO CSI report. In some embodiments the UE may be configured to aperiodically transmit CSI reports related to K=l Class B FD-MIMO CSI-RS transmission and K>1 Class B FD-MIMO CSI- RS transmission. In these embodiments, the UE may use similar logic to identify whether to update a CSI report related to a K=l Class B FD-MIMO CSI-RS transmission or a K>1 Class B FD-MIMO CSI-RS transmission. For example, the UE may identify which of the two CSI reports to update based on which report has a greater variance from a previously transmitted report, which CSI-RS transmission was addressed in the immediately preceding CSI report, or some additional or alternative factor. Similarly to above, some elements such as W2 or CQI may not be included in the K>1 Class B FD-MIMO CSI-RS transmission.

Figure 1 schematically illustrates a wireless communication network 100 (hereinafter "network 100") in accordance with various embodiments. The network 100 may include a UE 105 that is communicatively coupled with base station 130. In embodiments, the network 100 may be a third generation partnership project (3GPP) Long Term Evolution (LTE), LTE Advanced (LTE-A) LTE-Unlicensed (LTE-U) network, a fifth generation (5G) network, a new radio (NR) network, or some other type of network. In other embodiments, the network 100 may be some other type of wireless communication network.

As shown in Figure 1, the UE 105 may include transceiver circuitry 110, which may also be referred to as a multi-mode transceiver chip. The transceiver circuitry 110 may be configured to transmit and receive signals using one or more protocols such as LTE, LTE- A, LTE-U, 5G, or NR protocols. Specifically, the transceiver circuitry 110 may be coupled with one or more of a plurality of antennas 155 of the UE 105 for communicating wirelessly with other components of the network 100, e.g., base station 130 or another UE. The use of multiple antennas 155 may allow for the UE 105 to use transmit diversity techniques such as spatial orthogonal resource transmit diversity (SORTD), MIMO, FD- MIMO, eMIMO, etc.

In certain embodiments the transceiver circuitry 110 may include transmit circuitry 115 configured to cause the antennas 155 to transmit one or more signals from the UE 105, and receive circuitry 120 configured to process signals received by the antennas 155. In other embodiments, the transceiver circuitry 110 may be implemented in separate chips or modules, for example, one chip including the receive circuitry 120 and another chip including the transmit circuitry 115. In some embodiments, the transmitted or received signals may be cellular signals transmitted to or received from base station 130.

In some embodiments, the transceiver circuitry 110 may include or be coupled with CSI circuitry 125. The CSI circuitry may be configured to process one or more CSI-RS signals received by the UE 105, for example by antennas 155 and processed by receive circuitry 120. Specifically, the CSI circuitry 125 may perform one or more CSI measurements based on one or more parameters of the CSI-RS signal(s) to generate CSI feedback. The CSI circuitry 125 may also be configured to generate one or more periodic or aperiodic CSI feedback reports, as discussed above, and forward said reports to transmit circuitry 115.

Similar to the UE 105, the base station 130 may include transceiver circuitry 135. The transceiver circuitry 135 may be further coupled with one or more of a plurality of antennas 160 of the base station 130 for communicating wirelessly with other components of the network 100, e.g., UE 110. The use of multiple antennas 160 may allow for the base station 130 to use transmit diversity techniques such as SORTD, MIMO, FD-MIMO, eMIMO, etc. In certain embodiments the transceiver circuitry 135 may contain both transmit circuitry 140 configured to cause the antennas 160 to transmit one or more signals from the base station 130, and receive circuitry 145 to process signals received by the antennas 160. In other embodiments, the transceiver circuitry 135 may be replaced by transmit circuitry 140 and receive circuitry 145 which are separate from one another (not shown).

In embodiments, the base station 130 may additionally include CSI circuitry 150. The CSI circuitry 150 may, for example, be configured to generate one or more CSI-RS and forward the CSI-RS(s) to the transceiver circuitry 135 which may then cause the antennas 160 to transmit the CSI-RS(s) in accordance with the Class A or Class B FD-MIMO transmission schemes. The CSI circuitry 150 may additionally be configured to process the CSI feedback provided by UE 105 in a periodic or aperiodic report as described above.

Figures 2a, 2b, and 2c depict the various Classes of FD-MIMO that may be used.

Specifically Figure 2a depicts Class A FD-MIMO CSI-RS transmission from a base station 230a (which may be similar to base station 130) to UE 205a (which may be similar to UE 105). Specifically, the CSI-RS transmission 201a may not be precoded, and may be broadcast by base station 230a where it may be received by UE 205a. As described above, the UE 205a may then generate and transmit a periodic or aperiodic CSI feedback report to base station 230a based on the CSI-RS 201a.

Figure 2b depicts an example of K=l Class B FD-MIMO CSI-RS transmission from a base station 230b (which may be similar to base station 130) to UE 205b (which may be similar to UE 105). Specifically, a single CSI-RS transmission 201b may be beamformed from the base station 230b to the UE 205b. Additional beamformed transmissions 202 may be transmitted from the base station 230b, however those transmissions may not be intended for (e.g., directed towards or addressed to) UE 205b. As described above, the UE 205b may then generate and transmit a periodic or aperiodic CSI feedback report to base station 230b based on the CSI-RS 201b.

Figure 2c depicts an example of K>1 Class B FD-MIMO CSI-RS transmission from a base station 230c (which may be similar to base station 130) to UE 205b (which may be similar to UE 105). Specifically, a plurality of CSI-RS transmissions 201c may be beamformed from the base station 230c to the UE 205c. Additional CSI-RS transmissions such as transmission 203 may be broadcast from the base station 230c, but then may not be intended for (e.g., directed towards or addressed to ) UE 205c. As described above, the UE 205c may then generate and transmit a periodic or aperiodic CSI feedback report to base station 230c based on the CSI-RSs 201c. It will be understood that although Figure 2c depicts an example wherein the base station 230c transmits 2 CSI-RS transmissions 201c, in other embodiments the base station 230c may transmit more CSI-RS

transmissions.

Figure 3 depicts an example process flow for CSI feedback reporting, in accordance with various embodiments. The process flow may relate to, for example, embodiments described above wherein feedback related to one type of FD-MIMO CSI-RS transmission is transmitted periodically and feedback related to another type of FD-MIMO CSI-RS transmission is transmitted aperiodically.

Specifically, the process may begin with a UE such as UE 105 identifying first CSI related to a first CSI-RS transmitted in accordance with a first FD-MIMO type at 305. The process may continue with the UE identifying second CSI related to a second CSI-RS transmitted in accordance with a second FD-MIMO type 310. In embodiments, the elements 305 and 310 may be performed by CSI circuitry such as CSI circuitry 125 of UE 105. In other embodiments, one or both of elements 305 or 310 may be performed by some other circuitry.

In some embodiments the different FD-MIMO types identified in elements 305 and 310 may refer to different classes such as Class A FD-MIMO and Class B FD-MIMO as described above. In other embodiments, the different FD-MIMO types identified in elements 305 and 310 may refer to K=l and K>1 Class B FD-MIMO transmissions as described above. In other embodiments, the different FD-MIMO types identified in elements 305 and 310 may refer to some other FD-MIMO categorization.

The process may then include transmitting, by the UE, an indication of the first C SI in a periodic report at 315. The periodic report may be transmitted, for example, by transceiver circuitry 110 (and specifically transmit circuitry 115) via antennas 155. In some embodiments it may be said that CSI circuitry such as CSI circuitry 125 facilitates the transmission of the periodic report at 315. For example, the CSI circuitry may provide the report to the transceiver circuitry for transmission via the antennas. The periodic report may be, for example, related to Class A FD-MIMO CSI-RS transmissions by the base station as described above. Alternatively, the periodic report may be, for example, related to Class B K>1 FD-MIMO CSI-RS transmissions by the base station as described above.

As noted above, the periodic report may omit some elements of CSI reports such as a W2 report or channel quality information CQI reporting. However, the periodic report may still include some elements such as information related to a first precoding matrix (Wl) of a precoded matrix indicator (PMI). The periodic report may also include channel quality information CQI and selected CSI-RS among K CSI-RS resources configured for the UE.

The process may also include transmitting, by the UE, an indication of the second CSI in an aperiodic report at 320. Similarly, the aperiodic report may be transmitted by transceiver circuitry 110 (and specifically transmit circuitry 115) via antennas 155. In some embodiments it may be said that CSI circuitry such as CSI circuitry 125 facilitates the transmission of the periodic report at 320. For example, the CSI circuitry may provide the report to the transceiver circuitry for transmission via the antennas. The aperiodic report may be, for example, related to Class B FD-MIMO CSI-RS transmissions by the base station as described above. More specifically, the aperiodic report may be related to the Class B transmissions if the periodic report transmitted at 315 is related to the Class A transmissions. Alternatively, the periodic report may be, for example, related to Class B K=l FD-MIMO CSI-RS transmissions by the base station as described above. More specifically, the aperiodic report may be related to the Class B K=l transmissions if the periodic report is related to the Class B K>1 transmissions by the base station as described above.

It will be understood that the elements of Figure 3 are described as sequential merely for the purpose of description only. In embodiments the elements (e.g. 310 and 305 or 315 and 320) may occur concurrently. In other embodiments element 310 may occur before element 305, or element 320 may occur before element 315.

Figure 4 depicts an alternative example process flow for CSI feedback reporting, in accordance with various embodiments. The process flow may relate to, for example, embodiments described above wherein feedback related to two different types of FD- MIMO CSI-RS transmission is transmitted in aperiodic reports. However, as described above, in some embodiments an aperiodic report related to only one of the two aperiodic reports may be updated prior to transmission.

Specifically, the process may begin with a UE such as UE 105 identifying that a first aperiodic report based on first CSI related to a first FD-MIMO type is to be transmitted at 405. As discussed above, the first FD-MIMO type may be Class A FD-MIMO, and the CSI may be related to a Class A FD-MIMO CSI-RS transmission by a base station such as base station 130. In other embodiments, the first FD-MIMO type may be Class B K>1 FD- MIMO, and the CSI may be related to a Class B K>1 FD-MIMO CSI-RS transmission by a base station such as base station 130.

The process may further include identifying, by a UE, that a second aperiodic report based on second CSI related to a second FD-MIMO type is to be transmitted at 410. In embodiments, the second FD-MIMO type may be Class B FD-MIMO if the first FD- MIMO type is Class A FD-MIMO, as described above. In other embodiments, the second FD-MIMO type may be Class B K=l FD-MIMO if the first FD-MIMO type is Class B K>1 FD-MIMO, as described above.

The process may then include identifying that the first aperiodic report should be updated and the second aperiodic report should not be updated at element 415. In some embodiments the identification may be based on comparison of the aperiodic reports with a previously transmitted aperiodic report related to the same FD-MIMO type. For example, CSI feedback in a previously transmitted aperiodic report related to the first FD- MIMO type may be compared to the CSI feedback in the aperiodic report that was identified at 405. Similarly, CSI feedback in a previously transmitted aperiodic report related to the second FD-MIMO type may be compared to the CSI feedback in the aperiodic report that was identified at 410. The previously transmitted reports may have been transmitted in a preceding slot, frame, subframe, or some other time division. If the variance between the aperiodic reports of the first type is greater than the variance between the aperiodic reports of the second type, then the aperiodic report identified at 405 may be identified to be updated and the aperiodic report identified at 410 may be identified to not be updated at 415.

Additionally or alternatively, the identification at 415 may be based on which FD-MIMO type had a CSI report most recently transmitted (for example in a preceding or immediately preceding slot, frame, subframe, some other time division, etc.). If the aperiodic report related to the second FD-MIMO type was most recently transmitted by the UE, then the aperiodic report identified at 405 may be identified to be updated and the aperiodic report identified at 410 may be identified to not be updated at 415. In other embodiments, the identification at 415 may rely on one or more additional or alternative considerations or factors.

The aperiodic report identified at 405 may then be updated at 420. As used herein, "updating" may refer to updating the CSI information of the aperiodic report to better reflect more recent measurements. The first and second aperiodic reports (e.g., those identified at 405 and 410) may then be transmitted at 425.

In embodiments, elements 405, 410, 415, or 420 may be performed by CSI circuitry such as CSI circuitry 125 of UE 105. In other embodiments, one or more of elements 405, 410, 415, or 420 may be performed by some other circuitry. Element 425 may be performed by transceiver circuitry 110 (and specifically transmit circuitry 115) via antennas 155. In some embodiments it may be said that CSI circuitry such as CSI circuitry 125 facilitates the transmission at 425. For example, the CSI circuitry may provide the first and second aperiodic reports to the transceiver circuitry for transmission via the antennas.

It will be understood that the process flow depicted in Figure 4 is intended as an example only. In some embodiments the UE may identify at 415, for example based on the criteria above or some other criteria, that the second aperiodic report should be updated and the first aperiodic report should not be updated at 415. In this embodiment, the UE may then update the second aperiodic report at 420.

Additionally, it will be understood that in some embodiments elements 405 and 410 may happen concurrently, or the order of those elements may be switched. Generally, with respect to Figures 3 and 4 or other descriptions herein, the terms "first" and "second" as they are used with respect to the various reports or FD-MIMO types are intended to serve as designators, and unless otherwise specifically stated should not be interpreted to designate any specific timing relationship.

Finally, it will be understood that in some embodiments, as discussed above, certain elements of an aperiodic report may not be transmitted. For example, a Class A FD- MIMO CSI-RS transmission or a Class B K>1 FD-MIMO CSI-RS transmission may not include W2 information or CQI reporting.

Embodiments described herein may be implemented into a system using any suitably configured hardware and/or software. Figure 5 illustrates, for one embodiment, example components of an electronic device 500. In embodiments, the electronic device 500 may be, implement, be incorporated into, or otherwise be a part of the UE 105, the base station, or some other electronic device.

In some embodiments, the electronic device 500 may include application circuitry 502, baseband circuitry 504, Radio Frequency ("RF") circuitry 506, front-end module ("FEM") circuitry 508 and one or more antennas 510, coupled together at least as shown.

As used herein, the term "circuitry" may refer to, be part of, or include an Application Specific Integrated Circuit ("ASIC"), an electronic circuit, a processor (shared, dedicated, or group), and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, the circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, circuitry may include logic, at least partially operable in hardware.

The application circuitry 502 may include one or more application processors. For example, the application circuitry 502 may include circuitry such as, but not limited to, one or more single-core or multi-core processors 502a. The processor(s) 502a may include any combination of general-purpose processors and dedicated processors (e.g., graphics processors, application processors, etc.). The processors 502a may be coupled with and/or may include computer-readable media 502b (also referred to as "CRM 502b," "memory 502b," "storage 502b," or "memory /storage 502b") and may be configured to execute instructions stored in the CRM 502b to enable various applications and/or operating systems to run on the system.

The baseband circuitry 504 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The baseband circuitry 504 may include one or more baseband processors and/or control logic to process baseband signals received from a receive signal path of the RF circuitry 506 and to generate baseband signals for a send signal path of the RF circuitry 506. Baseband circuity 504 may interface with the application circuitry 502 for generation and processing of the baseband signals and for controlling operations of the RF circuitry 506. For example, in some embodiments, the baseband circuitry 504 may include a second generation ("2G") baseband processor 504a, third generation ("3G") baseband processor 504b, fourth generation ("4G") baseband processor 504c, fifth generation ("5G") baseband processor 504h, and/or other baseband processor(s) 504d for other existing generations, generations in development or to be developed in the future (e.g., 6G, etc.). The baseband circuitry 504 (e.g., one or more of baseband processors 504a-d, h) may handle various radio control functions that enable communication with one or more radio networks via the RF circuitry 506. The radio control functions may include, but are not limited to, signal modulation/demodulation, encoding/decoding, radio frequency shifting, and the like. In some embodiments, modulation/demodulation circuitry of the baseband circuitry 504 may include Fast-Fourier Transform (FFT), precoding, and/or constellation mapping/demapping functionality. In some embodiments, encoding/decoding circuitry of the baseband circuitry 504 may include convolution, tail-biting convolution, turbo, Viterbi, and/or Low Density Parity

Check (LDPC) encoder/decoder functionality. Embodiments of modulation/demodulation and encoder/decoder functionality are not limited to these examples and may include other suitable functionality in other embodiments.

Generally, the baseband circuitry 504 may be similar to, or include functions similar to, CSI circuitry 125 or 150. In some embodiments, the baseband circuitry 504 may include elements of a protocol stack such as, for example, elements of an E-UTRAN protocol including, for example, PHY, MAC, RLC, PDCP, and/or RRC elements. A central processing unit (CPU) 504e of the baseband circuitry 504 may be configured to run elements of the protocol stack for signaling of the PHY, MAC, RLC, PDCP and/or RRC layers. In some embodiments, the baseband circuitry 504 may include one or more audio digital signal processor(s) (DSP) 504f. The audio DSP(s) 504f may include elements for compression/decompression and echo cancellation and may include other suitable processing elements in other embodiments. The baseband circuitry 504 may further include computer-readable media 504g (also referred to as "CRM 504g," "memory 504g," "storage 504g," or "CRM 504g"). The CRM 504g may be used to load and store data and/or instructions for operations performed by the processors of the baseband circuitry 504. CRM 504g for one embodiment may include any combination of suitable volatile memory and/or non-volatile memory. The CRM 504g may include any combination of various levels of memory /storage including, but not limited to, read-only memory (ROM) having embedded software instructions (e.g., firmware), random access memory (e.g., dynamic random access memory (DRAM)), cache, buffers, etc. The CRM 504g may be shared among the various processors or dedicated to particular processors. Components of the baseband circuitry 504 may be suitably combined in a single chip or a single chipset, or disposed on a same circuit board in some embodiments. In some embodiments, some or all of the constituent components of the baseband circuitry 504 and the application circuitry 502 may be implemented together, such as, for example, on a system on a chip (SOC).

In some embodiments, the baseband circuitry 504 may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry 504 may support communication with an E-UTRAN and/or other wireless metropolitan area networks ("WMAN"), a wireless local area network

("WLAN"), a wireless personal area network ("WPAN"). Embodiments in which the baseband circuitry 504 is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.

RF circuitry 506, which may be similar to transceiver circuitry 110 or 135, may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry 506 may include switches, filters, amplifiers, etc., to facilitate the communication with the wireless network. RF circuitry 506 may include a receive signal path that may include circuitry to down-convert RF signals received from the FEM circuitry 508 and provide baseband signals to the baseband circuitry 504. RF circuitry 506 may also include a send signal path that may include circuitry to up-convert baseband signals provided by the baseband circuitry 504 and provide RF output signals to the FEM circuitry 508 for transmission.

In some embodiments, the RF circuitry 506 may include a receive signal path and a send signal path. The receive signal path of the RF circuitry 506 (which may be similar to receive circuitry 120 or 145) may include mixer circuitry 506a, amplifier circuitry 506b and filter circuitry 506c. The send signal path of the RF circuitry 506, which may be similar to transmit circuitry 1 15 or 140, may include filter circuitry 506c and mixer circuitry 506a. RF circuitry 506 may also include synthesizer circuitry 506d for synthesizing a frequency for use by the mixer circuitry 506a of the receive signal path and the send signal path. In some embodiments, the mixer circuitry 506a of the receive signal path may be configured to down-convert RF signals received from the FEM circuitry 508 based on the synthesized frequency provided by synthesizer circuitry 506d. The amplifier circuitry 506b may be configured to amplify the down-converted signals and the filter circuitry 506c may be a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals. Output baseband signals may be provided to the baseband circuitry 504 for further processing. In some embodiments, the output baseband signals may be zero-frequency baseband signals, although this is not a requirement. In some embodiments, mixer circuitry 506a of the receive signal path may comprise passive mixers, although the scope of the embodiments is not limited in this respect.

In some embodiments, the mixer circuitry 506a of the send signal path may be configured to up-convert input baseband signals based on the synthesized frequency provided by the synthesizer circuitry 506d to generate RF output signals for the FEM circuitry 508. The baseband signals may be provided by the baseband circuitry 504 and may be filtered by filter circuitry 506c. The filter circuitry 506c may include a low-pass filter (LPF), although the scope of the embodiments is not limited in this respect.

In some embodiments, the mixer circuitry 506a of the receive signal path and the mixer circuitry 506a of the send signal path may include two or more mixers and may be arranged for quadrature downconversion and/or upconversion, respectively. In some embodiments, the mixer circuitry 506a of the receive signal path and the mixer circuitry 506a of the send signal path may include two or more mixers and may be arranged for image rejection (e.g., Hartley image rejection). In some embodiments, the mixer circuitry 506a of the receive signal path and the mixer circuitry 506a of the send signal path may be arranged for direct downconversion and/or direct upconversion, respectively. In some embodiments, the mixer circuitry 506a of the receive signal path and the mixer circuitry 506a of the send signal path may be configured for super-heterodyne operation.

In some embodiments, the output baseband signals and the input baseband signals may be analog baseband signals, although the scope of the embodiments is not limited in this respect. In some alternate embodiments, the output baseband signals and the input baseband signals may be digital baseband signals. In these alternate embodiments, the RF circuitry 506 may include analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry and the baseband circuitry 504 may include a digital baseband interface to communicate with the RF circuitry 506.

In some dual-mode embodiments, a separate radio IC circuitry may be provided for processing signals for each spectrum, although the scope of the embodiments is not limited in this respect.

In some embodiments, the synthesizer circuitry 506d may be a fractional-N synthesizer or a fractional N/N+l synthesizer, although the scope of the embodiments is not limited in this respect, as other types of frequency synthesizers may be suitable. For example, synthesizer circuitry 506d may be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer comprising a phase-locked loop with a frequency divider. The synthesizer circuitry 506d may be configured to synthesize an output frequency for use by the mixer circuitry 506a of the RF circuitry 506 based on a frequency input and a divider control input. In some embodiments, the synthesizer circuitry 506d may be a fractional N/N+l synthesizer.

In some embodiments, frequency input may be provided by a voltage controlled oscillator (VCO), although that is not a requirement. Divider control input may be provided by either the baseband circuitry 504 or the application circuitry 502 depending on the desired output frequency. In some embodiments, a divider control input (e.g., N) may be determined from a look-up table based on a channel indicated by the application circuitry 502.

Synthesizer circuitry 506d of the RF circuitry 506 may include a divider, a delay -locked loop (DLL), a multiplexer and a phase accumulator. In some embodiments, the divider may be a dual modulus divider (DMD) and the phase accumulator may be a digital phase accumulator (DP A). In some embodiments, the DMD may be configured to divide the input signal by either N or N+l (e.g., based on a carry out) to provide a fractional division ratio. In some example embodiments, the DLL may include a set of cascaded, tunable, delay elements, a phase detector, a charge pump and a D-type flip-flop. In these embodiments, the delay elements may be configured to break a VCO period up into Nd equal packets of phase, where Nd is the number of delay elements in the delay line. In this way, the DLL provides negative feedback to help ensure that the total delay through the delay line is one VCO cycle.

In some embodiments, synthesizer circuitry 506d may be configured to generate a carrier frequency as the output frequency, while in other embodiments, the output frequency may be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency) and used in conjunction with quadrature generator and divider circuitry to generate multiple signals at the carrier frequency with multiple different phases with respect to each other. In some embodiments, the output frequency may be a LO frequency (fLO). In some embodiments, the RF circuitry 506 may include an IQ/polar converter. FEM circuitry 508 may include a receive signal path that may include circuitry configured to operate on RF signals received from one or more antennas 510 (which may be similar to antennas 155 or 160), amplify the received signals and provide the amplified versions of the received signals to the RF circuitry 506 for further processing. FEM circuitry 508 may also include a send signal path that may include circuitry configured to amplify signals for transmission provided by the RF circuitry 506 for transmission by one or more of the one or more antennas 510. In some embodiments, the FEM circuitry 508 may include a TX/RX switch to switch between send mode and receive mode operation. The FEM circuitry 508 may include a receive signal path and a send signal path. The receive signal path of the FEM circuitry may include a low-noise amplifier (LNA) to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to the RF circuitry 506). The send signal path of the FEM circuitry 508 may include a power amplifier (PA) to amplify input RF signals (e.g., provided by RF circuitry 506), and one or more filters to generate RF signals for subsequent transmission (e.g., by one or more of the one or more antennas 510).

In some embodiments, the electronic device 500 may include additional elements such as, for example, a display, a camera, one or more sensors, and/or interface circuitry (for example, input/output (I/O) interfaces or buses) (not shown). In embodiments where the electronic device is implemented in or by a base station , the electronic device 500 may include network interface circuitry. The network interface circuitry may be one or more computer hardware components that connect electronic device 500 to one or more network elements, such as one or more servers within a core network or one or more other base station via a wired connection. To this end, the network interface circuitry may include one or more dedicated processors and/or field programmable gate arrays (FPGAs) to communicate using one or more network communications protocols such as X2 application protocol (AP), SI AP, Stream Control Transmission Protocol (SCTP), Ethernet, Point-to-Point (PPP), Fiber Distributed Data Interface (FDDI), and/or any other suitable network communications protocols.

In some embodiments, the electronic device 500 may be configured to perform one or more processes, techniques, and/or methods as described herein, or portions thereof. For example, the electronic device 500 may implement the flows/structures shown and described above with respect to Figures 3 or 4.

Figure 6 is a block diagram illustrating components, according to some example embodiments, able to read instructions from a machine-readable or computer-readable medium (for example, a non-transitory machine-readable storage medium) and perform any one or more of the methodologies discussed herein. Specifically, Figure 6 shows a diagrammatic representation of hardware resources 600 including one or more processors (or processor cores) 610, one or more memory /storage devices 620, and one or more communication resources 630, each of which may be communicatively coupled via a bus 640. For embodiments where node virtualization (for example, network function virtualization ("NFV")) is utilized, a hypervisor 602 may be executed to provide an execution environment for one or more network slices/sub-slices to utilize the hardware resources 600.

The processors 610 (for example, a CPU, a reduced instruction set computing ("RISC") processor, a complex instruction set computing ("CISC") processor, a graphics processing unit ("GPU"), a digital signal processor ("DSP") such as a baseband processor, an application specific integrated circuit ("ASIC"), a radio-frequency integrated circuit ("RFIC"), another processor, or any suitable combination thereof) may include, for example, a processor 612 and a processor 614.

The memory /storage devices 620 may include main memory, disk storage, or any suitable combination thereof. The memory /storage devices 620 may include, but are not limited to, any type of volatile or non-volatile memory such as dynamic random access memory ("DRAM"), static random-access memory ("SRAM"), erasable programmable read-only memory ("EPROM"), electrically erasable programmable read-only memory

("EEPROM"), Flash memory, solid-state storage, etc.

The communication resources 630 may include interconnection or network interface components or other suitable devices to communicate with one or more peripheral devices 604 or one or more databases 606 via a network 608. For example, the communication resources 630 may include wired communication components (for example, for coupling via a Universal Serial Bus ("USB")), cellular communication components, near-field communication ("NFC") components, Bluetooth® components (for example, Bluetooth® Low Energy), Wi-Fi® components, and other communication components.

Instructions 650 may comprise software, a program, an application, an applet, an app, or other executable code for causing at least any of the processors 610 to perform any one or more of the methodologies discussed herein.

In embodiments in which the hardware resources 600 are incorporated into the UE 105, the instructions 650 may cause the processors 610 to perform the operation

flow/algorithmic structures or other operations of a UE described, for example, in the flows of Figures 3 or 4.

The instructions 650 may reside, completely or partially, within at least one of the processors 610 (for example, within the processor's cache memory), the memory /storage devices 620, or any suitable combination thereof. Furthermore, any portion of the instructions 650 may be transferred to the hardware resources 600 from any combination of the peripheral devices 604 or the databases 606. Accordingly, the memory of processors 610, the memory /storage devices 620, the peripheral devices 604, and the databases 606 are examples of computer-readable and machine-readable media.

The resources described in Figure 6 may also be referred to as circuitry. For example, communication resources 630 may also be referred to as communication circuitry 630.

Some non-limiting examples are provided below.

Example 1 may include an apparatus comprising: one or more processors; and one or more non-transitory computer-readable media coupled with the one or more processors, wherein the one or more non-transitory computer-readable media includes instructions that, upon execution of the instructions by the one or more processors, are to cause the apparatus to: identify first channel state information (CSI) related to a first CSI reference signal (CSI- RS) transmitted by a base station in accordance with a first full-dimension multiple input multiple output (FD-MIMO) type; identify second CSI related to a second CSI-RS transmitted by the base station in accordance with a second FD-MIMO type; facilitate transmission of an indication of the first CSI in a periodic report; and facilitate transmission of an indication of the second CSI in an aperiodic report.

Example 2 may include the apparatus of example 1, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO.

Example 3 may include the apparatus of example 1, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 4 may include the apparatus of any of examples 1-3, wherein the instructions are further to facilitate transmission of the indication of the first CSI in the periodic report via up to 32 antenna ports using a codebook that relates to non-precoded CSI-RS.

Example 5 may include the apparatus of any of examples 1-3, wherein the instructions are further to facilitate transmission of the indication of the second CSI in the aperiodic report via up to 8 antenna ports using a codebook that relates to a beamformed CSI-RS.

Example 6 may include the apparatus of any of examples 1-3, wherein the instructions are further to facilitate transmission of the periodic report in accordance with one or more higher-layer configured reporting periods.

Example 7 may include the apparatus of any of examples 1-3, wherein the instructions are further to facilitate transmission of the aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

Example 8 may include the apparatus of any of examples 1-3, wherein the apparatus is a user equipment (UE).

Example 9 may include one or more non-transitory computer-readable media comprising instructions that, upon execution by one or more processors of an apparatus, cause the apparatus to: identify first channel state information (CSI) related to a first CSI reference signal (CSI-RS) transmitted by a base station in accordance with a first full-dimension multiple input multiple output (FD-MIMO) type; identify second CSI related to a second CSI-RS transmitted by the base station in accordance with a second FD-MIMO type; transmit an indication of the first C SI in a periodic report; and transmit an indication of the second CSI in an aperiodic report.

Example 10 may include the one or more non-transitory computer-readable media of example 9, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD- MIMO type is Class B FD-MIMO.

Example 11 may include the one or more non-transitory computer-readable media of example 9, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 12 may include the one or more non-transitory computer-readable media of any of examples 9-11, wherein the instructions are further to transmit the indication of the first CSI in the periodic report via up to 32 antenna ports using a codebook that relates to non- precoded CSI-RS.

Example 13 may include the one or more non-transitory computer-readable media of any of examples 9-11, wherein the instructions are further to transmit the indication of the second CSI in the aperiodic report via up to 8 antenna ports using a codebook that relates to a beamformed CSI-RS.

Example 14 may include the one or more non-transitory computer-readable media of any of examples 9-11, wherein the instructions are further to transmit the periodic report in accordance with one or more higher-layer configured reporting periods.

Example 15 may include the one or more non-transitory computer-readable media of any of examples 9-11, wherein the instructions are further to transmit the aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

Example 16 may include the one or more non-transitory computer-readable media of any of examples 9-11, wherein the apparatus is a user equipment (UE).

Example 17 may include an apparatus comprising: means to identify first channel state information (CSI) related to a first CSI reference signal (CSI-RS) transmitted by a base station in accordance with a first full-dimension multiple input multiple output (FD- MIMO) type; means to identify second CSI related to a second CSI-RS transmitted by the base station in accordance with a second FD-MIMO type; means to transmit an indication of the first CSI in a periodic report; and means to transmit an indication of the second CSI in an aperiodic report.

Example 18 may include the apparatus of example 17, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO.

Example 19 may include the apparatus of example 17, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 20 may include the apparatus of any of examples 17-19, further comprising means to transmit the indication of the first CSI in the periodic report via up to 32 antenna ports using a codebook that relates to non-precoded CSI-RS.

Example 21 may include the apparatus of any of examples 17-19, further comprising means to transmit the indication of the second CSI in the aperiodic report via up to 8 antenna ports using a codebook that relates to a beamformed CSI-RS.

Example 22 may include the apparatus of any of examples 17-19, further comprising means to transmit the periodic report in accordance with one or more higher-layer configured reporting periods.

Example 23 may include the apparatus of any of examples 17-19, further comprising means to transmit the aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

Example 24 may include the apparatus of any of examples 17-19, wherein the apparatus is a user equipment (UE).

Example 25 may include a method comprising: identifying, by an apparatus, first channel state information (CSI) related to a first CSI reference signal (CSI-RS) transmitted by a base station in accordance with a first full-dimension multiple input multiple output (FD- MIMO) type; identifying, by the apparatus, second CSI related to a second CSI-RS transmitted by the base station in accordance with a second FD-MIMO type; transmitting, by the apparatus, an indication of the first CSI in a periodic report; and transmitting, by the apparatus, an indication of the second CSI in an aperiodic report.

Example 26 may include the method of example 25, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO. Example 27 may include the method of example 25, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 28 may include the method of any of examples 25-27, further comprising transmitting, by the apparatus, the indication of the first CSI in the periodic report via up to 32 antenna ports using a codebook that relates to non-precoded CSI-RS.

Example 29 may include the method of any of examples 25-27, further comprising transmitting, by the apparatus, the indication of the second CSI in the aperiodic report via up to 8 antenna ports using a codebook that relates to a beamformed CSI-RS.

Example 30 may include the method of any of examples 25-27, further comprising transmitting, by the apparatus, the periodic report in accordance with one or more higher- layer configured reporting periods.

Example 31 may include the method of any of examples 25-27, further comprising transmitting, by the apparatus, the aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

Example 32 may include the method of any of examples 25-27, wherein the apparatus is a user equipment (UE).

Example 33 may include a method comprising: identifying, by an apparatus, that a first aperiodic report based on first channel state information (CSI) related to a first full dimension multiple input multiple output (FD-MIMO) type is to be transmitted to a base station; identifying, by the apparatus, that a second aperiodic report based on second CSI related to a second FD-MIMO type is to be transmitted to the base station; identifying, by the apparatus based on a previous transmission of an aperiodic report related to the first or the second FD-MIMO type, that the first aperiodic report should be updated and the second aperiodic report should not be updated; and transmitting, by the apparatus, the updated first aperiodic report and the second aperiodic report.

Example 34 may include the method of example 33, further comprising transmitting, by the apparatus, the first aperiodic report or the second aperiodic report in accordance with downlink control information (DCI) received by the UE from the base station.

Example 35 may include the method of example 33, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO. Example 36 may include the method of example 33, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 37 may include the method of any of examples 33-36, wherein identifying that the first aperiodic report should be updated and the second aperiodic report should not be updated includes identifying, by the apparatus, that an aperiodic report related to the second FD-MIMO type was more recently updated than an aperiodic report related to the first FD-MIMO type.

Example 38 may include the method of any of examples 33-36, wherein the previous transmission of an aperiodic report is related to the first FD-MIMO type and is a first previous transmission of an aperiodic report, and wherein identifying that the first aperiodic report should be updated and the second aperiodic report should not be updated includes identifying, by the apparatus, that the first aperiodic report has a greater variance from the first previous transmission than a variance of the second aperiodic report from a second previous transmission of an aperiodic report related to the second FD-MIMO type.

Example 39 may include the method of any of examples 33-36, wherein the apparatus is a user equipment (UE).

Example 40 may include one or more non-transitory computer-readable media comprising instruction that, upon execution by one or more processors of an apparatus, are to cause the apparatus to: identify that a first aperiodic report based on first channel state information (CSI) related to a first full dimension multiple input multiple output (FD- MIMO) type is to be transmitted to a base station; identify that a second aperiodic report based on second CSI related to a second FD-MIMO type is to be transmitted to the base station; identify, based on a previous transmission of an aperiodic report related to the first or the second FD-MIMO type, that the first aperiodic report should be updated and the second aperiodic report should not be updated; and transmit the updated first aperiodic report and the second aperiodic report.

Example 41 may include the one or more non-transitory computer-readable media of example 40, wherein the instructions are further to transmit the first aperiodic report or the second aperiodic report in accordance with downlink control information (DCI) received by the UE from the base station. Example 42 may include the one or more non-transitory computer-readable media of example 40, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD- MIMO type is Class B FD-MIMO.

Example 43 may include the one or more non-transitory computer-readable media of example 40, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 44 may include the one or more non-transitory computer-readable media of any of examples 40-43, wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that an aperiodic report related to the second FD-MIMO type was more recently updated than an aperiodic report related to the first FD-MIMO type.

Example 45 may include the one or more non-transitory computer-readable media of any of examples 40-43, wherein the previous transmission of an aperiodic report is related to the first FD-MIMO type and is a first previous transmission of an aperiodic report, and wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that the first aperiodic report has a greater variance from the first previous transmission than a variance of the second aperiodic report from a second previous transmission of an aperiodic report related to the second FD-MIMO type.

Example 46 may include the one or more non-transitory computer-readable media of any of examples 40-43, wherein the apparatus is a user equipment (UE).

Example 47 may include an apparatus comprising: means to identify that a first aperiodic report based on first channel state information (CSI) related to a first full dimension multiple input multiple output (FD-MIMO) type is to be transmitted to a base station; means to identify that a second aperiodic report based on second CSI related to a second FD-MIMO type is to be transmitted to the base station; means to identify, based on a previous transmission of an aperiodic report related to the first or the second FD-MIMO type, that the first aperiodic report should be updated and the second aperiodic report should not be updated; and means to transmit the updated first aperiodic report and the second aperiodic report. Example 48 may include the apparatus of example 47, further comprising means to transmit the first aperiodic report or the second aperiodic report in accordance with downlink control information (DCI) received by the UE from the base station.

Example 49 may include the apparatus of example 47, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO.

Example 50 may include the apparatus of example 47, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 51 may include the apparatus of any of examples 47-50, wherein the means to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include means to identify that an aperiodic report related to the second FD-MIMO type was more recently updated than an aperiodic report related to the first FD-MIMO type.

Example 52 may include the apparatus of any of examples 47-50, wherein the previous transmission of an aperiodic report is related to the first FD-MIMO type and is a first previous transmission of an aperiodic report, and wherein the means to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include means to identify that the first aperiodic report has a greater variance from the first previous transmission than a variance of the second aperiodic report from a second previous transmission of an aperiodic report related to the second FD-MIMO type.

Example 53 may include the apparatus of any of examples 47-50, wherein the apparatus is a user equipment (UE).

Example 54 may include an apparatus comprising: one or more processors; and one or more non-transitory computer-readable media coupled with the one or more processors, wherein the one or more non-transitory computer-readable media includes instructions that, upon execution of the instructions by the one or more processors, are to cause the apparatus to: identify that a first aperiodic report based on first channel state information (CSI) related to a first full dimension multiple input multiple output (FD-MIMO) type is to be transmitted to a base station; identify that a second aperiodic report based on second CSI related to a second FD-MIMO type is to be transmitted to the base station; identify, based on a previous transmission of an aperiodic report related to the first or the second FD-MIMO type, that the first aperiodic report should be updated and the second aperiodic report should not be updated; and facilitate transmission of the updated first aperiodic report and the second aperiodic report.

Example 55 may include the apparatus of example 54, wherein the instructions are further to facilitate transmission of the first aperiodic report or the second aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

Example 56 may include the apparatus of example 54, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO.

Example 57 may include the apparatus of example 54, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 58 may include the apparatus of any of examples 54-57, wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that an aperiodic report related to the second FD-MIMO type was more recently updated than an aperiodic report related to the first FD-MIMO type.

Example 59 may include the apparatus of any of examples 54-57, wherein the previous transmission of an aperiodic report is related to the first FD-MIMO type and is a first previous transmission of an aperiodic report, and wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that the first aperiodic report has a greater variance from the first previous transmission than a variance of the second aperiodic report from a second previous transmission of an aperiodic report related to the second FD-MIMO type.

Example 60 may include the apparatus of any of examples 54-57, wherein the apparatus is a user equipment (UE).

Example 61 may include an apparatus comprising: channel state information (CSI) circuitry to: identify that a first aperiodic report based on first CSI related to a first full dimension multiple input multiple output (FD-MIMO) type is to be transmitted to a base station; identify that a second aperiodic report based on second CSI related to a second FD-MIMO type is to be transmitted to the base station; and identify, based on a previous transmission of an aperiodic report related to the first or the second FD-MIMO type, that the first aperiodic report should be updated and the second aperiodic report should not be updated; and transceiver circuitry coupled with the CSI circuitry, the transceiver circuitry to facilitate transmission of the updated first aperiodic report and the second aperiodic report.

Example 62 may include the apparatus of example 61, wherein the transceiver circuitry is further to facilitate transmission of the first aperiodic report or the second aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

Example 63 may include the apparatus of example 61, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO.

Example 64 may include the apparatus of example 61, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 65 may include the apparatus of any of examples 61-64, wherein the CSI circuitry is to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated based on identification that an aperiodic report related to the second FD-MIMO type was more recently updated than an aperiodic report related to the first FD-MIMO type.

Example 66 may include the apparatus of any of examples 61-64, wherein the previous transmission of an aperiodic report is related to the first FD-MIMO type and is a first previous transmission of an aperiodic report, and wherein the CSI circuitry is to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated based on identification that the first aperiodic report has a greater variance from the first previous transmission than a variance of the second aperiodic report from a second previous transmission of an aperiodic report related to the second FD-MIMO type. Example 67 may include the apparatus of any of examples 61-64, wherein the apparatus is a user equipment (UE).

Example 68 may include an apparatus comprising: channel state information (CSI) circuitry to: identify first channel state information CSI related to a first CSI reference signal (CSI-RS) transmitted by a base station in accordance with a first full-dimension multiple input multiple output (FD-MIMO) type; identify second CSI related to a second CSI-RS transmitted by the base station in accordance with a second FD-MIMO type; and facilitate transmission of an indication of the first CSI in a periodic report; and transceiver circuitry coupled with the CSI circuitry, the transceiver circuitry to facilitate transmission of an indication of the second CSI in an aperiodic report.

Example 69 may include the apparatus of example 68, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO.

Example 70 may include the apparatus of example 68, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

Example 71 may include the apparatus of any of examples 68-70, wherein the transceiver circuitry is further to facilitate the transmission of the first CSI in the periodic report via up to 32 antenna ports using a codebook that relates to non-precoded CSI-RS.

Example 72 may include the apparatus of any of examples 68-70, wherein the transceiver circuitry is further to facilitate the transmission of the indication of the second CSI in the aperiodic report via up to 8 antenna ports using a codebook that relates to a beamformed CSI-RS.

Example 73 may include the apparatus of any of examples 68-70, wherein the transceiver circuitry is further to facilitate the transmission of the periodic report in accordance with one or more higher-layer configured reporting periods.

Example 74 may include the apparatus of any of examples 68-70, wherein the transceiver circuitry is further to facilitate the transmission of the aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

Example 75 may include the apparatus of any of examples 68-70, wherein the apparatus is a user equipment (UE).

Claims

CLAIMS What is claimed is:

1. An apparatus comprising:

one or more processors; and

one or more non-transitory computer-readable media coupled with the one or more processors, wherein the one or more non-transitory computer-readable media includes instructions that, upon execution of the instructions by the one or more processors, are to cause the apparatus to:

identify first channel state information (CSI) related to a first CSI reference signal (CSI-RS) transmitted by a base station in accordance with a first full- dimension multiple input multiple output (FD-MIMO) type;

identify second CSI related to a second CSI-RS transmitted by the base station in accordance with a second FD-MIMO type;

facilitate transmission of an indication of the first CSI in a periodic report; and

facilitate transmission of an indication of the second CSI in an aperiodic report.

2. The apparatus of claim 1, wherein the first FD-MIMO type is Class A FD- MIMO and the second FD-MIMO type is Class B FD-MIMO.

3. The apparatus of claim 1, wherein the first FD-MIMO type is a Class B FD- MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

4. The apparatus of any of claims 1-3, wherein the instructions are further to facilitate transmission of the indication of the first CSI in the periodic report via up to 32 antenna ports using a codebook that relates to non-precoded CSI-RS.

5. The apparatus of any of claims 1-3, wherein the instructions are further to facilitate transmission of the indication of the second CSI in the aperiodic report via up to 8 antenna ports using a codebook that relates to a beamformed CSI-RS.

6. The apparatus of any of claims 1-3, wherein the instructions are further to facilitate transmission of the periodic report in accordance with one or more higher-layer configured reporting periods.

7. The apparatus of any of claims 1-3, wherein the instructions are further to facilitate transmission of the aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

8. One or more non-transitory computer-readable media comprising instructions that, upon execution by one or more processors of an apparatus, cause the apparatus to: identify first channel state information (CSI) related to a first CSI reference signal (CSI-RS) transmitted by a base station in accordance with a first full-dimension multiple input multiple output (FD-MIMO) type;

transmit an indication of the first CSI in a periodic report; and

transmit an indication of the second CSI in an aperiodic report.

9. The one or more non-transitory computer-readable media of claim 8, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO.

10. The one or more non-transitory computer-readable media of claim 8, wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

11. The one or more non-transitory computer-readable media of any of claims 8- 10, wherein the instructions are further to transmit the indication of the first CSI in the periodic report via up to 32 antenna ports using a codebook that relates to non-precoded CSI-RS.

12. The one or more non-transitory computer-readable media of any of claims 8- 10, wherein the instructions are further to transmit the indication of the second CSI in the aperiodic report via up to 8 antenna ports using a codebook that relates to a beamformed CSI-RS.

13. The one or more non-transitory computer-readable media of any of claims 8- 10, wherein the instructions are further to transmit the periodic report in accordance with one or more higher-layer configured reporting periods.

14. The one or more non-transitory computer-readable media of any of claims 8- 10, wherein the instructions are further to transmit the aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

15. One or more non-transitory computer-readable media comprising instruction that, upon execution by one or more processors of an apparatus, are to cause the apparatus to:

identify that a first aperiodic report based on first channel state information (CSI) related to a first full dimension multiple input multiple output (FD-MIMO) type is to be transmitted to a base station;

identify that a second aperiodic report based on second CSI related to a second FD- MIMO type is to be transmitted to the base station; identify, based on a previous transmission of an aperiodic report related to the first or the second FD-MIMO type, that the first aperiodic report should be updated and the second aperiodic report should not be updated; and

transmit the updated first aperiodic report and the second aperiodic report.

16. The one or more non-transitory computer-readable media of claim 15, wherein the instructions are further to transmit the first aperiodic report or the second aperiodic report in accordance with downlink control information (DCI) received by the UE from the base station.

17. The one or more non-transitory computer-readable media of claim 15, wherein the first FD-MIMO type is Class A FD-MIMO and the second FD-MIMO type is Class B FD-MIMO, or wherein the first FD-MIMO type is a Class B FD-MIMO type related to a plurality of beamformed CSI-RSs and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS.

18. The one or more non-transitory computer-readable media of any of claims 15- 17, wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that an aperiodic report related to the second FD-MIMO type was more recently updated than an aperiodic report related to the first FD-MIMO type.

19. The one or more non-transitory computer-readable media of any of claims 15- 17, wherein the previous transmission of an aperiodic report is related to the first FD- MIMO type and is a first previous transmission of an aperiodic report, and wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that the first aperiodic report has a greater variance from the first previous transmission than a variance of the second aperiodic report from a second previous transmission of an aperiodic report related to the second FD-MIMO type.

20. An apparatus comprising:

one or more processors; and

identify that a second aperiodic report based on second CSI related to a second FD-MIMO type is to be transmitted to the base station;

identify, based on a previous transmission of an aperiodic report related to the first or the second FD-MIMO type, that the first aperiodic report should be updated and the second aperiodic report should not be updated; and

facilitate transmission of the updated first aperiodic report and the second aperiodic report.

21. The apparatus of claim 20, wherein the instructions are further to facilitate transmission of the first aperiodic report or the second aperiodic report in accordance with downlink control information (DCI) received by the apparatus from the base station.

22. The apparatus of claim 20, wherein the first FD-MIMO type is Class A FD- MIMO and the second FD-MIMO type is Class B FD-MIMO.

23. The apparatus of claim 20, wherein the first FD-MIMO type is a Class B FD-

MIMO type related to a plurality of beamformed CSI-RSs, and the second FD-MIMO type is a Class B FD-MIMO type related to a single beamformed CSI-RS. riiyss /r^ i

24. The apparatus of any of claims 20-23, wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that an aperiodic report related to the second FD- MIMO type was more recently updated than an aperiodic report related to the first FD- MIMO type.

25. The apparatus of any of claims 20-23, wherein the previous transmission of an aperiodic report is related to the first FD-MIMO type and is a first previous transmission of an aperiodic report, and wherein the instructions to identify that the first aperiodic report should be updated and the second aperiodic report should not be updated include instructions to identify that the first aperiodic report has a greater variance from the first previous transmission than a variance of the second aperiodic report from a second previous transmission of an aperiodic report related to the second FD-MIMO type.