Frequency Selective Single Frequency Network Based on Modified Type II Port Selection Codebook

Abstract

Frequency selective single frequency network (SFN) operation based on a modified type II port selection codebook is disclosed. Within a channel state information (CSI) feedback process, a user equipment (UE) observing CSI reference signal (CSI-RS) resources configured by a serving base station (two ports are configured on multiple sectors of the serving base station) can select a precoder from a type II port selection codebook that accommodates additional subband amplitude information. The additional subband amplitude information may include a subband dynamic SFN activation indicator. In this CSI report of an option from the type II port selection codebook, in addition to the subband phase information, the UE can also indicate both wideband SFN activation / deactivation and subband SFN activation / deactivation to the serving base station. The serving base station can then use this CSI report to activate / deactivate SFN operation in both wideband and subband on each participating sector.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. patent application No. 17 / 236,390, filed on April 21, 2021, and entitled “Frequency-Selective single frequency network based on the modified type-ii Port Selection Codebook,” and the benefit of U.S. non-provisional patent application No. 63 / 029,291, filed on May 22, 2020, and entitled “Frequency-Selective single frequency network based on the modified type-ii Port Selection Codebook,” both of which are expressly incorporated herein by reference in their entirety. Technical Field

[0003]

[0006] Generally speaking, aspects of the present disclosure relate to wireless communication systems, and more particularly, to frequency selective single frequency networks (SFNs) based on a modified Type II port selection codebook. Background Art

[0004] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcasting, etc. These wireless networks can be multiple access networks that can support multiple users by sharing available network resources. These networks (which are usually multiple access networks) support communications for multiple users by sharing available network resources. An example of such a network is the Universal Terrestrial Radio Access Network (UTRAN). UTRAN is a radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), which is a third generation (3G) mobile phone technology supported by the Third Generation Partnership Project (3GPP). Examples of multiple access network formats include code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, and single carrier FDMA (SC-FDMA) networks.

[0005] A wireless communication network may include multiple base stations or Node Bs that can support communications for multiple user equipments (UEs). A UE may communicate with a base station via a downlink and an uplink. A downlink (or forward link) refers to a communication link from a base station to a UE, while an uplink (or reverse link) refers to a communication link from a UE to a base station.

[0006] The base station may send data and control information to the UE on the downlink and / or may receive data and control information from the UE on the uplink. On the downlink, the transmission from the base station may encounter interference caused by transmissions from neighboring base stations or from other wireless radio frequency (RF) transmitters. On the uplink, the transmission from the UE may encounter interference from other UEs communicating with neighboring base stations or from uplink transmissions from other wireless RF transmitters. This interference may degrade the performance on both the downlink and uplink.

[0007] As the demand for mobile broadband access continues to grow, the potential for interference and congested networks increases as more UEs access long-range wireless communication networks and more short-range wireless systems are deployed in communities. Research and development continues to advance wireless technologies to not only meet the growing demand for mobile broadband access, but also to advance and enhance the user experience of mobile communications. Summary of the invention

[0008] In one aspect of the present disclosure, a method for wireless communication includes: receiving, at a UE, one or more channel quality reference signal resources from a serving base station on each sector within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; reporting, by the UE, a resource selection feedback message to the serving base station, wherein the resource selection feedback message identifies a channel quality resource selected for each sector among the one or more channel quality reference signal resources; receiving, at the UE, a channel state information-reference signal (CSI-RS) resource, the CSI-RS resource being configured with two or more antenna ports and being selected according to the resource selection. The UE selects the selected channel quality resource identified in the feedback message for beamforming, wherein one antenna port of the two or more antenna ports is allocated to one sector in each sector within the reception area and another antenna port of the two or more antenna ports is allocated to another sector in each sector within the reception area; and the UE reports port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic single frequency network (SFN) activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0009] In another aspect of the present disclosure, a method for wireless communication includes: sending one or more channel quality reference signal resources to a served UE on each sector within a reception area of ​​the served UE at a base station, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; receiving a resource selection feedback message from the served UE by the base station, wherein the resource selection feedback message identifies a channel quality resource selected for each sector in the one or more channel quality reference signal resources; sending a CSI-RS resource at the base station, wherein the CSI-RS resource is configured with two or more antenna ports and is selected according to the resource selection feedback message. The base station comprises: a base station for beamforming according to the selected channel quality resources identified in the feedback message, wherein one antenna port of the two or more antenna ports is allocated to one sector in each sector in the reception area and another antenna port of the two or more antenna ports is allocated to another sector in each sector in the reception area; and the base station receives port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0010] In another aspect of the present disclosure, an apparatus configured for wireless communication includes: a unit for receiving one or more channel quality reference signal resources from a serving base station on each sector where a UE is within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; a unit for reporting a resource selection feedback message by the UE to the serving base station, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources; a unit for sending a CSI-RS resource at the base station, the CSI-RS resource being configured with two or more antenna ports and being selected according to the The method comprises the steps of: providing a base station for transmitting a signal to a receiver based on a selected channel quality resource identified in a resource selection feedback message, wherein one of the two or more antenna ports is assigned to one sector in each sector in the reception area and another of the two or more antenna ports is assigned to another sector in each sector in the reception area; and a unit for receiving, by the base station, port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0011] In another aspect of the present disclosure, an apparatus configured for wireless communication includes: a unit for sending one or more channel quality reference signal resources to a served UE on each sector within a reception area of ​​the served UE at a base station, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; a unit for receiving a resource selection feedback message from the served UE by the base station, wherein the resource selection feedback message identifies a channel quality resource selected for each sector in the one or more channel quality reference signal resources; a unit for sending a CSI-RS resource at the base station, wherein the CSI-RS resource is configured with two or more antenna ports and is root The method comprises: providing a base station for transmitting a signal to a receiver based on a selected channel quality resource identified in the resource selection feedback message, wherein one of the two or more antenna ports is assigned to one sector in each sector in the reception area and another of the two or more antenna ports is assigned to another sector in each sector in the reception area; and a unit for receiving, by the base station, port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0012] In another aspect of the present disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code also includes: code for receiving one or more channel quality reference signal resources from a serving base station in each sector where a UE is within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; code for reporting a resource selection feedback message by the UE to the serving base station, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources; code for sending a CSI-RS resource at the base station, wherein the CSI-RS resource is configured with two or more antenna ports and is selected according to the signal selected in the resource selection feedback message. The invention relates to a base station for beamforming a selected channel quality resource identified by the base station, wherein one antenna port of the two or more antenna ports is assigned to one sector in each sector in the reception area and another antenna port of the two or more antenna ports is assigned to another sector in each sector in the reception area; and code for receiving, by the base station, port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0013] In another aspect of the present disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code also includes: code for sending one or more channel quality reference signal resources to a served UE at each sector within a reception area of ​​the served UE at a base station, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; code for receiving a resource selection feedback message from the served UE by the base station, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources; code for sending a CSI-RS resource at the base station, wherein the CSI-RS resource is configured with two or more antenna ports and is selected according to the resource selection feedback message. The invention relates to a base station for beamforming a selected channel quality resource identified in a received signal, wherein one of the two or more antenna ports is assigned to one sector in each sector in the received area and another of the two or more antenna ports is assigned to another sector in each sector in the received area; and code for receiving, by the base station, port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0014] In another aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor, and a memory coupled to the processor. The processor is configured to: receive one or more channel quality reference signal resources from a serving base station in each sector where a UE is within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; report a resource selection feedback message by the UE to the serving base station, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources; send a CSI-RS resource at the base station, wherein the CSI-RS resource is configured with two or more antenna ports and is selected according to the resource selection feedback message. The base station comprises: a base station for transmitting a signal to a receiver based on a channel quality resource of the receiver, wherein one antenna port of the two or more antenna ports is allocated to one sector in each sector within the reception area and another antenna port of the two or more antenna ports is allocated to another sector in each sector within the reception area; and the base station receives port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0015] In another aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor, and a memory coupled to the processor. The processor is configured to: send one or more channel quality reference signal resources to the served UE on each sector within the reception area of ​​the served UE at a base station, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; receive a resource selection feedback message from the served UE by the base station, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources; send a CSI-RS resource at the base station, wherein the CSI-RS resource is configured with two or more antenna ports and is selected according to the signal quality resource identified in the resource selection feedback message. The base station comprises: a base station for transmitting a signal to a receiver via a wireless communication channel, wherein one of the two or more antenna ports is allocated to one sector in each sector within the reception area and another of the two or more antenna ports is allocated to another sector in each sector within the reception area; and the base station receives port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0016] The foregoing has summarized the features and technical advantages of the examples according to the present disclosure quite broadly so that the following specific embodiments may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples may be easily used as the basis for modifying or designing other structures for the same purpose of achieving the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein (in terms of both their organization and method of operation) and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each drawing is provided for illustration and description, and does not define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] A further understanding of the nature and advantages of the present disclosure may be achieved by reference to the following drawings. In the drawings, similar components or features may have the same reference numeral. In addition, individual components of the same type may be distinguished by following the reference numeral with a dash and a second reference numeral that distinguishes between similar components. If only the first reference numeral is used in the specification, the description applies to any of the similar components having the same first reference numeral, regardless of the second reference numeral.

[0018] Figure 1 is a block diagram showing details of a wireless communication system.

[0019] Figure 2 is a block diagram showing a design of a base station and a UE configured according to one aspect of the present disclosure.

[0020] Figure 3 is a process diagram illustrating a two-step hybrid CSI process operable in a 5G NR network scenario.

[0021] Figure 4A and Figure 4B is a block diagram illustrating exemplary blocks executed to implement one aspect of the present disclosure.

[0022] Figure 5 is a block diagram illustrating communications between a base station and a UE in a two-step CSI process configured according to one aspect of the present disclosure.

[0023] Figure 6 is a block diagram illustrating a two-step CSI process configured according to one aspect of the present disclosure.

[0024] Figure 7 is a block diagram illustrating a UE configured according to one aspect of the present disclosure.

[0025] Figure 8 is a block diagram illustrating a base station configured according to one aspect of the present disclosure. DETAILED DESCRIPTION

[0026] The specific embodiments described below in conjunction with the accompanying drawings are intended to be descriptions of various configurations and are not intended to represent the only configurations in which the concepts described herein can be practiced. This specific embodiment includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid confusing these concepts.

[0027] In general, the present disclosure relates to wireless communication systems (also referred to as wireless communication networks). In various embodiments, various techniques and devices can be used for wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, global mobile communication systems (GSM) networks, fifth generation (5G) or new wireless (NR) networks, and other communication networks. As described herein, the terms "network" and "system" can be used interchangeably.

[0028] OFDMA networks can implement wireless technologies such as Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, Flash OFDM, etc. UTRA, E-UTRA, and GSM are part of Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These various wireless technologies and standards are known or under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications alliances that aims to define globally applicable third generation (3G) mobile phone specifications. 3GPP Long Term Evolution (LTE) is a 3GPP plan to improve UMTS mobile phone standards. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure focuses on the evolution of wireless technology from LTE, 4G, 5G, NR and above and shared access to wireless spectrum between networks using new and different sets of radio access technologies or radio air interfaces.

[0029] 5G networks envision diverse deployments, diverse spectrum, and diverse services and devices that can be implemented using a unified air interface based on OFDM. To achieve these goals, in addition to developing new wireless technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to scale to provide coverage for the following: (1) Ultra-high density (e.g., about 1M nodes / km) 2 ), ultra-low complexity (e.g., on the order of tens of bits / second), ultra-low energy (e.g., on the order of 10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) mission-critical control including strong security to protect sensitive personal, financial, or confidential information, ultra-high reliability (e.g., on the order of 99.9999% reliability), ultra-low latency (e.g., on the order of 1 ms), and users with or without a wide range of mobility; and (3) enhanced mobile broadband including extremely high capacity (e.g., on the order of 10 Tbps / km 2 ), extremely high data rates (e.g., multi-Gbps rates, user experience rates of over 100Mbps), and deep perception for improved discovery and optimization.

[0030] 5G NR communication systems can be implemented to use optimized OFDM-based waveforms with scalable digital schemes and transmission time intervals (TTIs). Additional features may also include: a common flexible framework for efficiently multiplexing services and features using dynamic low-latency time division duplex (TDD) / frequency division duplex (FDD) designs; and improved wireless technologies, such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel coding, and device-centric mobility. The scalability of digital schemes in 5G NR and the scaling of subcarrier spacing can efficiently solve the operation of diversified services across diverse spectrums and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD / TDD implementations, the subcarrier spacing can appear at 15kHz on bandwidths (BW) such as 5, 10, and 20MHz. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, the subcarrier spacing can appear at 30kHz on 80 / 100MHz BW. For various other indoor broadband implementations using TDD on the unlicensed portion of the 5 GHz band, subcarrier spacing may occur at 60 kHz on 160 MHz BW. Finally, for various deployments transmitting with a millimeter wave component under TDD at 28 GHz, subcarrier spacing may occur at 120 kHz on 500 MHz BW.

[0031] 5G NR's scalable digital scheme facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Long and short TTIs are efficiently multiplexed to allow transmissions to start at symbol boundaries. 5G NR also envisions a self-contained integrated subframe design with uplink / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink / downlink that can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current business needs.

[0032] Various other aspects and features of the present disclosure are further described below. It should be apparent that the teachings herein can be embodied in a variety of forms, and any specific structure, function, or both disclosed herein are only representative and non-restrictive. Based on the teachings herein, it should be appreciated by those of ordinary skill in the art that an aspect disclosed herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement a device or practice a method. In addition, other structures, functionality, or structures and functionality other than or different from one or more aspects set forth herein can be used to implement the device or practice the method. For example, the method can be implemented as a part of a system, device, device, and / or implemented as an instruction stored on a computer-readable medium for execution on a processor or computer. In addition, an aspect can include at least one element of a claim.

[0033] Both the UE and the base station may include one or more radio frequency (RF) chains, each of which may include a precoder and an amplifier. The precoder correlates the data to be transmitted with the output symbols according to the characteristics of the channel over which the data is to be transmitted. Typically, precoding may take the form of Y=W·x, where x represents the symbol to be transmitted, W is the precoding matrix, and Y is the symbol for transmission according to the available resources. In many systems, as discussed below, the precoder may react according to the characteristics of the channel. In many systems, the channel may be analyzed to determine the channel characteristics.

[0034] In wireless communication, channel state information (CSI) may refer to known channel properties of a communication link. CSI may indicate how a signal may propagate from a transmitter to a receiver in the air. CSI may indicate, for example, the combined channel effects of scattering, fading, and / or power attenuation with the distance between the transmitter and the receiver. Channel estimation may be performed to determine these effects on the channel. CSI may be used to adapt transmission based on current channel conditions, which may be useful for achieving reliable communication (particularly high data rates in multi-antenna systems). CSI is typically estimated, quantized, and fed back to the transmitter at the receiver. CSI may include various feedback information, such as a rank indicator (RI), a channel quality indicator (CQI), and / or a precoding matrix indicator (PMI). CSI may be used to report wireless channel quality information to a base station.

[0035] The UE may receive one or more CSI-RS from the base station, determine channel properties, determine multiple precoding coefficients based on the channel properties, and feed back the precoding coefficients to the base station (e.g., in a CSI report). The base station may receive the multiple precoding coefficients and apply them to downlink beamforming / precoding to provide the best downlink signal quality to the UE.

[0036] The present disclosure describes a mechanism for sending CSI feedback to reduce CSI payload. In some examples, a base station may utilize codebook-based transmission to form a beam for communication with a UE. The codebook may include a set of frequency domain (FD) beamforming components, each identified by an index. FD beamforming components may also be referred to as FD basis vectors, FD basis, or basis vectors. In some aspects, a base station may restrict a UE to a subset of FD beamforming components in a codebook. For example, a base station may indicate a restricted subset by indicating an index (in various forms) from which the UE can select. By reducing the set of FD beamforming components, complexity and power consumption at the UE may be reduced.

[0037] In some aspects, the base station may indicate one or more groups of CSI-RS ports with space-frequency beamforming. In the case where downlink-uplink reciprocity is local (e.g., in an FDD system or TDD system where the uplink and downlink are not transmitted in the same subband), by indicating group information of CSI-RS ports with space-frequency beamforming, CSI reporting accuracy may be improved compared to deriving downlink channel status only through uplink sounding.

[0038] Figure 1 1 is a block diagram illustrating an example of a wireless communication system 100 according to various aspects of the present disclosure, the wireless communication system 100 supporting modified two-step CSI operation, wherein the amplitude information for the type II port selection codebook includes an additional bit to accommodate a dynamic subband SFN activation indicator. The network 100 may be a 5G network. The network 100 includes a plurality of base stations (BSs) (105) (respectively labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities. The base station 105 may be a site that communicates with the UE 115 and may also be referred to as an evolved Node B (eNB), a next generation eNB (gNB), an access point, and the like. Each base station 105 may provide communication coverage for a particular geographic area. In 3GPP, depending on the context in which the term "cell" is used, the term "cell" may refer to a specific geographic coverage area of ​​a base station and / or a base station subsystem (where the base station and / or base station subsystem serves the coverage area).

[0039] A base station may provide communication coverage for a macro cell or a small cell (e.g., a pico cell or a femto cell) and / or other types of cells. A macro cell generally covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with a service subscription to a network provider. A small cell (e.g., a pico cell) generally covers a relatively small geographic area and may allow unrestricted access by UEs with a service subscription to a network provider. A small cell (e.g., a femto cell) may also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A base station for a macro cell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1 In the example shown in , base stations 105d and 105e can be conventional macro base stations, while base stations 105a-105c can be macro base stations with one of 3-dimensional (3D), full-dimensional (FD) or massive MIMO capabilities. BS 105a-105c can use 3D beamforming on both elevation and azimuth beamforming to increase coverage and capacity. BS 105f can be a small cell base station, which can be a home node or a portable access point. Base station 105 can support one or more (e.g., two, three, four, etc.) cells.

[0040] The network 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing and may substantially align transmissions from different base stations in time. For asynchronous operation, the base stations may have different frame timing and may not align transmissions from different base stations in time.

[0041] UE 115 is dispersed throughout the wireless network 100, and each UE 115 can be fixed or mobile. UE 115 can also be referred to as a terminal, a mobile station, a user unit, a station, etc. UE 115 can be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, etc. In one aspect, UE 115 can be a device including a universal integrated circuit card (UICC). In another aspect, UE can be a device that does not include UICC. In some aspects, UE 115 that does not include UICC can also be referred to as an IoT device or an Internet of Everything (IoE) device. UE 115a-115d is an example of a mobile smart phone type device that accesses the network 100. UE 115 can also be a machine that is specially configured for connected communications (including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc.). UE 115e-115h is an example of various machines configured for communication to access network 100. UE 115i-115k is an example of a vehicle equipped with a wireless communication device configured for communication to access network 100. UE can communicate with any type of base station (whether macro base station, small cell, etc.). Figure 1 In the figure, the lightning beam (e.g., communication link) indicates a wireless transmission between UE 115 and a serving base station 105 (the serving base station 105 is a base station designated to serve UE 115 on a downlink and / or uplink), an expected transmission between base stations 105, a backhaul transmission between base stations, or a sidelink transmission between UE 115.

[0042] In operation, base stations 105a-105c can use 3D beamforming and coordinated spatial techniques (e.g., coordinated multipoint (CoMP) or multi-connectivity) to serve UEs 115a and 115b. Macro base station 105d can perform backhaul communications with base stations 105a-105c, and small cell base station 105f. Macro base station 105d can also send multicast services subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information (e.g., weather emergencies or alerts, such as Amber alerts or gray alerts).

[0043] The base stations 105 may also communicate with a core network. The core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some of the base stations 105 (e.g., which may be examples of gNBs or access node controllers (ANCs)) may interface with the core network via backhaul links (e.g., NG-C, NG-U, etc.) and may perform wireless configuration and scheduling for communication with the UE 115. In various examples, the base stations 105 may communicate with each other directly or indirectly (e.g., through the core network) over backhaul links (e.g., X1, X2, etc.), which may be wired or wireless communication links.

[0044] The network 100 may also support mission-critical communications with ultra-reliable and redundant links for mission-critical devices, such as UE 115e, which may be a drone. The redundant communication links with UE 115e may include links from macro base stations 105d and 105e and a link from a small cell base station 105f. Other machine-type devices, such as UE 115f (e.g., a thermometer), UE 115g (e.g., a smart meter), and UE 115h (e.g., a wearable device), may communicate directly with a base station (e.g., small cell base station 105f and macro base station 105e) through the network 100, or in a multi-step configuration by communicating with another user device that relays its information to the network, such as UE 115f transmitting temperature measurement information to smart meter UE 115g, which then reports to the network through the small cell base station 105f. The network 100 may also provide additional network efficiency through dynamic, low-latency TDD / FDD communications (e.g., V2V, V2X, C-V2X communications between UE 115i, 115j, or 115k and other UEs 115 and / or vehicle-to-infrastructure (V2I) communications between UE 115i, 115j, or 115k and base station 105).

[0045] In some implementations, network 100 communicates using OFDM-based waveforms. OFDM-based systems can divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, frequency bands, etc. Each subcarrier can be modulated with data. In some instances, the subcarrier spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. The system bandwidth can also be divided into subbands. In other instances, the subcarrier spacing and / or the duration of the TTI can be scalable.

[0046] In some aspects, the base station 105 may allocate or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink and uplink transmissions in the network 100. Downlink refers to the transmission direction from the base station 105 to the UE 115, while uplink refers to the transmission direction from the UE 115 to the base station 105. The communication may be in the form of a radio frame. The radio frame may be divided into a plurality of subframes or time slots, for example, about 10. Each time slot may be further divided into mini time slots. In FDD mode, simultaneous uplink and downlink transmissions may occur in different frequency bands. For example, each subframe includes an uplink subframe in an uplink frequency band and a downlink subframe in a downlink frequency band. In TDD mode, uplink and downlink transmissions occur in different time periods using the same frequency band. For example, a subset of subframes (e.g., downlink subframes) in a radio frame may be used for downlink transmissions, and another subset of subframes (e.g., uplink subframes) in the radio frame may be used for uplink transmissions.

[0047] The downlink subframe and the uplink subframe can be further divided into several areas. For example, each downlink or uplink subframe can have a predefined area for transmitting reference signals, control information and data. The reference signal is a predetermined signal that facilitates communication between the base station 105 and the UE 115. For example, the reference signal can have a specific pilot pattern or structure, wherein the pilot tone can span the operating BW or frequency band, and each pilot tone is located at a predefined time and a predefined frequency. For example, the base station 105 can send a cell-specific reference signal (CRS) and / or a channel state information-reference signal (CSI-RS) to enable the UE 115 to estimate the downlink signal. Similarly, the UE 115 can send a sounding reference signal (SRS) to enable the base station 105 to estimate the uplink channel. The control information may include resource allocation and protocol control. The data may include protocol data and / or operating data. In some aspects, the base station 105 and the UE 115 can communicate using a self-contained subframe. The self-contained subframe may include a portion for downlink communication and a portion for uplink communication. A self-contained subframe may be downlink-centric or uplink-centric. A downlink-centric subframe may include a duration for downlink communication that is longer than a duration for uplink communication. A downlink-centric subframe may include a duration for downlink communication that is longer than a duration for uplink communication.

[0048] In some aspects, the network 100 may be an NR network deployed on a licensed spectrum. The base station 105 may send synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in the network 100 to facilitate synchronization. The base station 105 may broadcast system information associated with the network 100 (e.g., including a master information block (MIB), remaining system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some instances, the base station 105 may broadcast the PSS, SSS, and / or MIB in the form of a synchronization signal block (SSB) on a physical broadcast channel (PBCH), and may broadcast the RMSI and / or OSI on a physical downlink shared channel (PDSCH).

[0049] In some aspects, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a base station 105. The PSS may enable synchronization of periodic timing and may indicate a physical layer identity value. The UE 115 may then receive the SSS. The SSS may enable radio frame synchronization and may provide a cell identity value that may be combined with a physical layer identity value to identify the cell. The PSS and SSS may be located in the center portion of a carrier or any suitable frequency within a carrier.

[0050] After receiving the PSS and SSS, the UE 115 may receive the MIB. The MIB may include system information for initial network access and scheduling information for RMSI and / or OSI. After decoding the MIB, the UE 115 may receive the RMSI and / or OSI. The RMSI and / or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource sets (CORESET) for physical downlink control channel (PDCCH) monitoring, physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), power control, and SRS.

[0051] After the connection is established, the UE 115 and the base station 105 may enter a normal operation phase, in which operational data may be exchanged. For example, the base station 105 may schedule the UE 115 for uplink and / or downlink communications. The base station 105 may send an uplink and / or downlink scheduling grant to the UE 115 via the PDCCH. The scheduling grant may be sent in the form of downlink control information (DCI). The base station 105 may send a downlink communication signal (e.g., carrying data) to the UE 115 via the PDSCH according to the downlink scheduling grant. The UE 115 may send an uplink communication signal to the base station 105 via the PUSCH and / or PUCCH according to the uplink scheduling grant.

[0052] In some aspects, the network 100 may operate on a system BW or a component carrier (CC) BW. The network 100 may divide the system BW into multiple BWPs (e.g., parts). The base station 105 may dynamically allocate the UE 115 to operate on a certain BWP (e.g., a certain part of the system BW). The allocated BWP may be referred to as an active BWP. The UE 115 may monitor the active BWP for signaling information from the base station 105. The base station 105 may schedule the UE 115 for uplink or downlink communication in the active BWP. In some aspects, the base station 105 may allocate a pair of BWPs within the CC to the UE 115 for uplink and downlink communication. For example, the BWP pair may include a BWP for uplink communication and a BWP for downlink communication.

[0053] In some aspects, the base station 105 and the UE 115 can communicate with each other by utilizing MIMO and beamforming techniques. For example, the base station 105 can send a reference signal to the UE 115. The reference signal can be referred to as a CSI-RS and includes a predetermined pilot signal so that the UE 115 can estimate the downlink channel between the base station 105 and the UE 115. In order to facilitate beamforming at the base station 105, the UE 115 can feedback CSI (e.g., an estimate of the downlink channel) to the base station 105. In some aspects, the base station 105 can perform precoding to generate a transmit beam with a certain directionality and / or a certain transmit power. The precoding process can include weighting the signal phase and / or signal amplitude at the antenna elements of the base station 105.

[0054] In some aspects, the base station 105 and the UE 115 may have an array of antenna elements and may apply beamforming techniques to communicate with each other. The antenna array may be in the form of a single panel or multiple panels. Each antenna panel may include multiple antenna ports or elements in the vertical dimension and multiple antenna ports or elements in the horizontal dimension. In some examples, the base station 105 may have a multi-panel antenna and the UE 115 may have a single-panel antenna. In some other examples, the base station 105 and the UE 115 may both have multi-panel antennas. The base station 105 may form a beam on an angular direction array by weighting the signal phase and amplitude at the antenna element, and may utilize the best beam to communicate with the UE 115. The best beam may refer to, for example, a high-quality beam, wherein the beam may have the highest received signal power in the beam set measured at the UE 115.

[0055] In some aspects, UE 115 may utilize a Type II codebook for CSI feedback, as described in the document entitled “3 rdGeneration Partnership Project; Technical Specification Group Radio Access Network; NR; Physical layer procedures for data" (December 2019, Section 5.2.2) described in 3GPP document TS 38.214 Version 15 (which is incorporated herein by reference). UE 115 can report CSI based on a Type II codebook.

[0056] For port selection in some systems (e.g., Release 15 NR port selection), the base station 105 can use beam as a precoder for CSI-RS. The base station may have N tx transmit antennas, and the downlink channel response matrix for a certain subband can be represented as H. By applying the corresponding beamforming weights (represented as column vector w) to each transmit antenna i ), the base station 105 may generate antenna ports. A CSI-RS port may refer to a port on which a CSI-RS sequence is transmitted. The base station 105 may generate a total of P ports, where P<=N tx . For beamforming weights w i The equivalent downlink channel response vector can be equal to Hw at a specific subband i In addition, for all P ports, the composite equivalent downlink channel response matrix can be H·[w 1, w 2,…, w P ], which has P layers. It should be understood that vectors may also be referred to as components in the present disclosure.

[0057] The precoder for one layer on the subband can be given by:

[0058]

[0059] in represents a vector, represents the broadband amplitude value common to all subbands, represents the subband amplitude value which can be different for each subband, and φ i denotes a subband phase value that may be different for each subband. In equation (1), the top row may represent beamforming components for a first polarization, and the bottom row may represent beamforming components for a second polarization.

[0060] In this example, UE 115 can select CSI-RS ports instead of selecting beams. Therefore, using equation (1) in the port selection codebook, if the (i)th vector 11 d+i) entries is equal to 1 and the remaining entries are 0, then UE 115 can select the (i 11 d+i) entry ports. With this codebook, there are P ports, half of which are used for polarization 1 and the other half for polarization 2, and the same L ports are applied to both polarizations. UE 115 can access the UE 115 via i 11 to report the preferred candidate L ports, where the first candidate L ports may be 0...L-1, the second candidate L ports may be d...d+L-1, and the last candidate L ports may be In this case, UE 115 may be restricted to selecting L consecutive ports per subband (eg, port i 11 d...i 11 d+L-1), thereby potentially reducing the CSI payload. However, this restriction lacks flexibility and does not result in optimal performance. More flexible options would result in large CSI payloads and overhead signaling.

[0061] To overcome the port selection issues discussed above, the UE 115 may report port selection using a port selection codebook with space-frequency 2D beamforming (e.g., Release 17 NR port selection with space-frequency 2D beamforming). For example, using a Type II port selection codebook with space-frequency beamforming, the UE 115 may send a reference signal (e.g., SRS) to the base station 105, which receives the reference signal and generates a plurality of wideband beamforming ports. For example, the base station 105 may estimate the uplink channel state for each subband and determine a plurality of downlink spatial domain (SD) beamforming weight components for each subband based on downlink-uplink reciprocity. Subsequently, the base station 105 may determine a plurality of downlink frequency domain (FD) beamforming weight components for each SD beamforming weight component based on the corresponding weight values ​​for all subbands. Additionally, the base station 105 may determine a wideband beamforming port by linearly combining a plurality of weighted wideband beamforming weight components for one or more SD beamforming weight components and one or more FD beamforming weight components (considered as space-frequency 2D beamforming).

[0062] The base station 105 may send a wideband CSI-RS with wideband beamforming ports and an additional CSI report configuration message to the UE 115, wherein the CSI report configuration message indicates that the CSI report is based on port selection using these CSI-RS ports. The UE 115 may receive the wideband CSI-RS with wideband beamforming ports and the CSI report configuration message from the base station 105, select a plurality of received wideband CSI-RS ports, and combine them with corresponding coefficients for each port. The UE 115 may then report the port selection result and the corresponding coefficients to the base station 105 in a CSI report.

[0063] The expression of space-frequency 2D beamforming can be expressed in many ways. For example, if the broadband beamforming port uses a transmit antenna with one polarization, the precoding matrix can be generated according to the following equation:

[0064]

[0065] Where W is a matrix, L represents the number of SD beamforming weight components, M represents the number of FD beamforming weight components, m represents the index of a set of candidate FD beamforming components (e.g., all possible FD beamforming components), and b i represents the SD beamforming weight component, represents the FD beamforming weight component, and d i,m Denotes a wideband coefficient. Each column of W represents a precoding component (eg, a precoding vector) for a subband. In other examples, these precoding components may be different.

[0066] In another example, if the wideband beamforming port uses a transmit antenna with two polarizations, the precoding matrix for each polarization (denoted as W 1 ,W 2 ) has the same form as W. The SD beamforming weight components {b i} and FD beamforming weight components The two polarizations may be identical or different.

[0067] In some aspects, CSI-RS port precoding and selection can be polarization common or polarization specific. For polarization common port selection, the same port can be used for each polarization. In some examples, the base station 105 can use the same precoder on corresponding ports in different polarizations. In some examples, the UE 115 assumes the organization of the CSI-RS. The organization can be configured by the base station 105 or specified in the wireless standard.

[0068] For polarization-common port selection, half of the CSI-RS ports may use transmit antennas on polarization 1, and the other half may use transmit antennas on polarization 2, where the two polarizations may have the same SD beamforming weight components, but other uneven divisions of ports may be performed for polarization. Precoding may be performed similarly to the other half of the CSI-RS ports (port by port).

[0069] Using the common polarization port selection, N 3 The PMI of a layer on any FD unit in the FD units may be provided according to the following formula:

[0070]

[0071] in With size And row i k has only one "1" (if row i k There is only one "1" in all N 3 Select the i-th FD unit k ports), where P is the total number of CSI-RS ports, c k Indicates that port i on polarization 1 k The associated linear combination coefficients (which are wideband coefficients), Indicates that port i on polarization 2 k The associated linear combination coefficients (which are broadband coefficients), and K 0 / 2 represents the number of CSI-RS ports that the UE can use to generate the linear combination to calculate the PMI in equation (3). UE 115 can report the CSI-RS port and port coefficients or port coefficient A subset of , where the coefficients of unreported ports are set to 0.

[0072] For polarization-specific port selection, base station 105 can use different precoders on CSI-RS ports in different polarizations. For example, a first portion of CSI-RS ports (e.g., 20 CSI-RS ports) can use transmit antennas on polarization 1, and a second portion of CSI-RS ports (e.g., 12 CSI-RS ports) can use transmit antennas on polarization 2. In some examples, UE 115 can select any CSI-RS ports for combining.

[0073] With polarization-specific port selection, N 3 The PMI of a layer on any FD unit in the FD units may be provided according to the following formula:

[0074]

[0075] in has size P x ​​1 and row i k There is only one "1" in all N 3 Select the i-th FD unit k ports), where P is the total number of CSI-RS ports, c k Indicates that port i k The associated linear combination coefficients, and K 0 represents the number of CSI-RS ports that the UE uses to generate the linear combination to calculate the PMI in equation (4). UE 115 may report CSI-RS ports and port coefficients or port coefficient A subset of , where the coefficients of unreported ports are set to 0.

[0076] Therefore, using the port selection codebook with space-frequency 2D beamforming discussed in Release 17 can reduce the CSI feedback payload compared to Release 15 NR port selection, because, for example, the port selection result reported by UE 115 is for wideband usage rather than for each subband usage. In addition, in the case where downlink-uplink reciprocity is local (e.g., in an FDD system or a TDD system where the uplink and downlink are not transmitted on the same subband), using the port selection codebook with space-frequency 2D beamforming discussed in Release 17 can improve CSI reporting accuracy compared to deriving the downlink channel state only through uplink sounding.

[0077] To overcome the problem of large CSI overhead signaling discussed above, UE 115 may report port selection using type II candidates with frequency compression (e.g., Release 16 NR). For example, using a type II codebook or a type II port selection codebook with FD compression, UE 115 may be configured to report FD compressed precoder feedback to reduce the overhead of CSI reporting.

[0078] In some examples, base station 105 sends a CSI-RS to UE 115, which determines a PMI based on the received CSI-RS and sends a CSI report to base station 105. Using codebook operation with FD compression for one layer, UE 115 can exploit sparsity in both the spatial and frequency domains by determining a compressed type II precoder W according to equation (5):

[0079]

[0080] Where W represents the compressed type II precoder, W 1is a matrix and represents an SD beamforming component comprising L beams (e.g., L columns) per polarization group (e.g., so 2L beams in total), is a matrix and includes a plurality of candidate linear combination coefficients (eg, all desired linear combination coefficients) (including amplitude and phase), wherein each element represents a tap coefficient of a beam, and is a matrix including components (each row is a component) used to perform compression in FD. The components in can be derived from a certain number of columns in the discrete Fourier transform (DFT) matrix.

[0081] UE 115 may set the W 1 , and The quantization result of is reported as PMI. Using the Type II port selection codebook with frequency compression, if the base station 105 uses one or more SD beamforming components at the CSI-RS port, the UE 115 can only determine and report and In this example, the UE 115 may not be required to determine and report the SD beamforming component matrix W 1 .

[0082] UE 115 may have some difficulty in estimating the channel or selecting a port. For example, in the case of a type II codebook with FD compression (with or without port selection), base station 105 reports UE 115 may send an SRS to base station 105, and base station 105 may derive information on the wireless channel from the SRS. It may be desirable for base station 105 to provide some guidance to UE 115 in selecting FD beamforming components. In doing so, UE 115 may be assisted in determining the best FD beamforming components. In addition, since there is a smaller subset of FD beamforming components to select from, computational complexity at UE 115 may be reduced, thereby potentially saving energy at UE 115.

[0083] In addition, in the case of a type II port selection codebook with space-frequency beamforming, for polarization-common port selection or polarization-specific port selection, the UE 115 can estimate the channel gain of each received CSI-RS port, select multiple CSI-RS ports, and combine the CSI-RS ports with corresponding coefficients for each port. The FD beamforming component used by the base station 105 may be unknown to the UE 115. On the one hand, the power attenuation distribution of the FD beamforming channel is moved or shifted compared to the power attenuation distribution without FD beamforming, potentially causing the UE 115 to have difficulty in determining which time domain window in the power attenuation distribution should be adopted. Therefore, the channel estimation performance in this scenario may be worse than that without FD beamforming. On the other hand, without information of FD beamforming, it may be difficult for the UE 115 to determine or recover the unbeamformed channel response matrix, potentially causing the UE 115 to have difficulty in selecting the best port and determining the port combination coefficient that can result in the maximum combined beamforming gain. It may be desirable for the base station 105 to indicate information about space-frequency 2D beamforming in CSI-RS port generation so that the UE 115 can improve channel estimation performance and derive better or optimal port selection results and port combining coefficients.

[0084] Figure 2 A block diagram showing a design of a base station 105 and a UE 115 is shown, where the base station 105 and the UE 115 may be Figure 1 A base station in each base station and a UE in each UE. At the base station 105, the transmit processor 220 can receive data from the data source 212 and control information from the controller / processor 240. The control information can be used for PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH, etc. The data can be used for PDSCH, etc. The transmit processor 220 can process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 can also generate reference symbols, such as for PSS, SSS, and cell-specific reference signals. The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols (if applicable), and can provide output symbol streams to modulators (MOD) 232a to 232t. Each modulator 232 can process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (eg, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a through 232t may be transmitted via antennas 234a through 234t, respectively.

[0085] At the UE 115, antennas 252a to 252r may receive downlink signals from the base station 105 and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the corresponding received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain received symbols from all demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. The receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to the data sink 260, and provide decoded control information to the controller / processor 280.

[0086] On the uplink, at the UE 115, a transmit processor 264 may receive and process data from a data source 262 (e.g., for PUSCH) and control information from a controller / processor 280 (e.g., for PUCCH). The transmit processor 264 may also generate reference symbols for reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signal from the UE 115 may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 115. The processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240.

[0087] Controllers / processors 240 and 280 may direct operations at base station 105 and UE 115, respectively. Controller / processor 240 or other processors and modules at base station 105 may perform or direct the execution of various processes for the techniques described herein. Processor / controller 280 or other processors and modules at UE 115 may also perform or direct the execution of, for example, the functional blocks shown in FIGS. A and 4B and / or other processes for the techniques described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0088] It has been proposed that the 5G NR system supports transmissions from multiple transmission reception points (TRPs) to the UE. In cases where these transmissions can occur jointly, throughput can be improved in such communications. Multiple TRP (multi-TRP) transmissions can occur from a TRP with the same physical cell identifier (PCID) or from a TRP with different PCIDs. In order to account for the return delay between multiple TRPs, non-coherent joint transmission (NCJT) technology can be used for transmission. In one example of multi-TRP transmission, each sector of a multi-sector base station operates under the same PCID. In this multi-sector multi-TRP operation, there will be no return delay because each sector is controlled by the same base station. Therefore, coherent joint transmission (CJT) technology may be possible for multi-TRP transmission.

[0089] For NCJT technology, the received signal includes the sum of the signals sent by each TRP. The received NCJT signal can be expressed as follows:

[0090]

[0091] Where y represents the received signal, α i represents the amplitude value of the i-th TRP, represents the channel vector between UE and the i-th TRP, w i represents the beam vector at the i-th TRP, and x represents the data transmission. For CJT technology, the received signal also includes the sum of the signals sent by each TRP. However, CJT also includes an in-phase coefficient that represents the phase between each transmission. The received CJT signal can be expressed as follows:

[0092]

[0093] where e jθ An in-phase coefficient representing the phase difference between the transmissions identifying the first TRP and the second TRP. The in-phase coefficient allows the sum of the transmissions from the TRPs to be summed in-phase rather than out-of-phase, as in the NCJT technique. Therefore, the CJT summation of the TRP transmissions results in a larger amplitude than the NCJT summation. In order to manage CSI feedback for such multi-TRP operations where each TRP has the same PCID, aspects of the present disclosure provide a two-step hybrid CSI process that includes additional amplitude information feedback from the UE to dynamically signal activation / deactivation of both wideband and sub-band SFN operations.

[0094] Figure 3is a process diagram illustrating a two-step hybrid CSI process that may be operated in the context of a 5G NR network. The identified hybrid CSI process may be implemented using a two-step process. The first step of the two-step hybrid CSI process may include slightly different operations depending on whether the subject communication occurs in a lower frequency range of the 5G network (frequency range 1 (FR1)) or a higher millimeter wave frequency range of the 5G network (frequency range 2 (FR2)). FR1 may typically include sub-6 GHz bands, while FR2 may typically include millimeter wave ranges between 24.25 GHz and 52.6 GHz. However, each of FR1 and FR2 may include additional similar ranges, where new frequency bands may be opened for 5G NR operation. Figure 3 The process diagram of FIG. 1 includes a base station 105 having an antenna array that generates three sectors (sectors 1-3). The exemplary process shown includes communications between the base station 105 and the UE 115.

[0095] In step 1 of FR1 operation, base station 105 sends a 2N packet from each of sectors 1 and 2 for CSI reporting. 1 N 2 Configuration of a CSI-RS resource for a port 300 FR1 (e.g., one CSI-RS resource per sector). UE 115 observes the channel quality reference signal (e.g., CSI-RS resource) and selects an appropriate precoder from the Type I single panel codebook and generates a CSI-RS report 301. FR1 For transmission to the base station 105 for each sector including the corresponding selected precoder.

[0096] In step 1 of FR2 operation, the base station 105 sends a configuration 300 for one or more CSI-RS resources with 1 or 2 ports for beam management from each of sectors 1 and 2. FR2 (e.g., one or more CSI-RS resources per sector). The one or more CSI-RS resources are transmitted in multiple mmWave beams in each sector. Alternatively, the base station 105 may use a synchronization signal block (SSB) for step 1 of the two-step process instead of CSI-RS. The UE 115 observes multiple channel quality reference signal beams (e.g., CSI-RS, SSB, etc.) and selects the most preferred beam, such as the beam with the highest signal quality, reference signal received power (RSRP), etc. CSI report 301 FR2The UE sends a CSI report 301FR2 including a beam index (e.g., CRI or SSB index) for each of sectors 1 and 2.

[0097] Step 2 of the two-step process operates in a similar manner for both FR1 and FR2. In step 2, the base station 105 sends a configuration 302 for a CSI-RS resource with 2 ports for beam management, where each of the two ports is assigned to a different sector. Thus, one port of the CSI-RS resource configured via configuration 302 is assigned to sector 1 and the other port is assigned to sector 2. Each port can then be configured by using the CSI report 301 configured during the first step. FR1 or 301 FR2 To improve the CSI feedback from UE 115, UE 115 observes the CSI-RS resources and selects port selection information from the type II port selection codebook for both sectors 1 and 2. The port selection information identifies the precoder w including the in-phase information and amplitude information for each sector. k,r,l The selected type II port selection codebook precoder can be expressed by the following formula:

[0098]

[0099] where L represents the number of selected / reported beams, which may be preconfigured, k represents the subband index, r represents the polarization indicator (+ or -), l represents the layer index (1 or 2), i represents the selected beamformed CSI-RS beam index (1, ..., L); and b i UE 115 includes the precoder in the port selection information in the CSI report 303 sent to base station 105.

[0100] The in-phase information of the port selection information in the CSI report 303 includes the in-phase coefficients used for sub-band transmission. Figure 3As shown in , the two-step CSI process reflects the legacy process. Therefore, the amplitude information includes 3 bits for wideband amplitude information, which can reflect the quantization level of the amplitude for wideband transmission or the dynamic single frequency network (SFN) activation indicator for wideband transmission. For subband operation, the legacy process includes 1 bit for identifying the subband amplitude quantization level. The legacy two-step CSI process does not include dynamic SFN control at the subband level. If the UE 115 includes a dynamic SFN activation indicator in the wideband amplitude information of the CSI report 303, the base station 105 can then dynamically switch between non-SFN transmission and SFN transmission. The base station 105 can use the in-phase coefficients fed back via the CSI report 303 to perform coherent combining.

[0101] Figure 4A and Figure 4B is a block diagram illustrating exemplary blocks that are executed to implement one aspect of the present disclosure. Figure 2 and Figure 7 The example blocks are described with reference to the UE 115 shown in FIG. Figure 7 1 is a block diagram illustrating a UE 115 configured according to one aspect of the present disclosure. The UE 115 includes a Figure 2 115. For example, the UE 115 includes a controller / processor 280 that operates to execute logic or computer instructions stored in a memory 282 and to control various components of the UE 115 that provide the features and functions of the UE 115. The UE 115 sends and receives signals via wireless radios 700a-r and antennas 252a-r under the control of the controller / processor 280. The wireless radios 700a-r include the following: Figure 2 1. The various components and hardware shown for UE 115 in EMBODIMENT 1 include modulators / demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.

[0102] Reference will also be made to Figure 2 and Figure 8 The example blocks are described with reference to the base station 105 shown in FIG. Figure 8 1 is a block diagram illustrating a base station 105 configured according to one aspect of the present disclosure. The base station 105 includes Figure 21. For example, the base station 105 includes a controller / processor 240 that operates to execute logic or computer instructions stored in a memory 242 and to control the components of the base station 105 that provide the features and functions of the base station 105. The base station 105 transmits and receives signals via wireless radios 800a-t and antennas 234a-t under the control of the controller / processor 240. The wireless radios 800a-t include, for example, Figure 2 1. Various components and hardware are shown for base station 105 in FIG. 1, including modulators / demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230.

[0103] At block 410, the base station transmits one or more channel quality reference signal resources, and at block 401, the UE receives the one or more channel quality reference signal resources from the serving base station on each sector within the reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources comprises one or more antenna ports. A base station (e.g., base station 105) may operate communications within multiple sectors using antennas 234a-t, wherein each sector shares the same PCID. To control CSI feedback from a served UE (e.g., UE 115), the base station 105 executes CSI logic 801 stored in memory under the control of the controller / processor 240. The actions and functionality implemented by executing the steps and instructions of the CSI logic 801 (referred to herein as the "execution environment" of the CSI logic 801) provide that the base station 105 configures the UE 115 with channel quality reference signal resources (e.g., CSI-RS, SSB, etc.), which the UE 115 may use to monitor and measure these reference signals transmitted by the base station 105. The base station 105 configures such channel quality reference signal resources for each sector managed by the base station 105 .

[0104] The UE 115 executes the CSI logic 701 stored in the memory 282 under the control of the controller / processor 280. Within the execution environment of the CSI logic 701, the UE 115 monitors the CSI configuration information sent from the serving base station (e.g., the base station 105). When the UE 115 receives the CSI configuration information, the UE 115 will monitor the channel quality reference signal from the base station 105.

[0105] At block 401, the UE reports a resource selection feedback message to the serving base station, and at block 411, the base station receives the resource selection feedback message, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources. The UE 115 executes measurement logic 702 stored in the memory 282 under the control of the controller / processor 280. The execution environment of the measurement logic 702 provides the UE 115 with functionality to identify the most preferred resource in the CSI-RS resources provided by the base station 105. In FR1, the execution environment of the measurement logic 702 and the CSI logic 701 provides the UE 115 with selecting a precoder from the type I codebook 703 in the memory 282. The selected precoder identifies the selected CSI-RS resource. In FR2, the execution environment of the measurement logic 702 and the CSI logic 701 provides the UE 115 with selecting a CSI-RS resource indicator (CRI) that identifies the selected beam for the configured CSI-RS resource in multiple beams. The precoder from the type I codebook 703 in FR1 operation and the CRI in FR2 operation provide resource selection feedback to the UE 115. Within the execution context of the CSI logic 701, the UE 115 generates a CSI report including the resource selection feedback and reports the CSI report to the base station 105 via the wireless radios 700a-r and antennas 252a-r.

[0106] The base station 105 receives CSI reports from the UE 115 via the antennas 234a-t and the wireless radios 800a-t. The base station 105 implements the two-step CSI process using resource selection feedback within the execution environment of the CSI logic 801. The base station 105 implemented with the functionality provided by the execution environment of the CSI logic 801 configures CSI-RS resources configured with two or more antenna ports based on the resource selection feedback.

[0107] At block 412, the base station transmits CSI-RS resources configured with two or more antenna ports and beamformed according to the selected channel quality resource identified in the resource selection feedback message, and at block 402, the UE receives the CSI-RS resources, wherein one of the two or more antenna ports is assigned to a sector within the reception area and at least another antenna port is assigned to another sector within the reception area. The base station 105 transmits CSI-RS resources configured with the two or more antenna ports beamformed with the beam selected via the resource selection feedback. The CSI-RS resource configuration is transmitted to the UE 115 via the wireless radio 800a-t and the antennas 234a-t.

[0108] The UE 115 receives the CSI-RS resource configuration via the antennas 252a-r and the wireless radios 700a-r. Within the execution context of the CSI logic 701, the UE 115 determines the CSI-RS resources configured with the two or more antenna ports and monitors the CSI-RS from the base station 105. Upon detecting the CSI-RS, within the execution context of the measurement logic 702, the UE 115 measures the quality of the detected CSI-RS.

[0109] At block 403, the UE reports port selection feedback for each sector, and at block 413, the base station receives port selection feedback for each sector, the port selection feedback including one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator. The UE 115 uses the measurement results of the CSI-RS resources within the execution environment of the CSI logic 701 to select the port selection feedback from the type II codebook 704 stored in the memory 282. According to aspects of the present disclosure, the port selection feedback includes one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator includes an additional bit for the subband amplitude. The additional bit allows the UE 115 to dynamically trigger activation / deactivation of subband SFN transmission.

[0110] The base station 105 receives the port selection feedback from the UE 115 via the antennas 234a-t and the wireless radios 800a-t. Within the execution environment of the CSI logic 801, the base station 105 identifies the port selection feedback signaled from the type II codebook 803 in the memory 282. The base station 105 can then determine whether the phase and amplitude indicators for each sector provided by the UE 115, including the wideband and subband amplitudes, indicate activation / deactivation of wideband / subband SFN transmission. When one or both of the wideband and subband amplitudes indicate a quantization level, the base station 105 will provide for transmission of the data in accordance with the execution of the joint transmission logic 805 in the memory 242. The execution environment of the joint transmission logic 805 provides for the base station 105 to transmit jointly on two sectors. When one or both of the wideband and subband amplitudes indicate wideband / subband SFN activation / deactivation, the base station 105 will activate or deactivate SFN transmission in accordance with the execution of the SFN transmission logic 804 in the memory 242. The execution environment of the SFN transmission logic 804 provides the base station 105 with the ability to activate or deactivate SFN transmission in a corresponding sector.

[0111] Figure 51 is a block diagram illustrating communications between a base station 105 and a UE 115 in a two-step CSI process configured according to one aspect of the present disclosure. According to the illustrated aspect of the present disclosure, a CSI report 500 representing a step 2 CSI report sent by a UE 115 includes in port selection information 501 a CSI number that can be used for a precoder w k,r,l The precoder in the port selection information 501 includes broadband amplitude information Subband amplitude information And sub-band phase information The additional bits provide the ability to hold additional subband amplitude information. According to aspects of the present disclosure, the amplitude information may include not only wideband and subband amplitude quantization level values, but also wideband and subband dynamic SFN activation indicators. As mentioned above, in the legacy two-step CSI process, the subband amplitude information 1 bit for quantization level without any control over sub-band SFN operation. According to aspects of the present disclosure, sub-band amplitude information At least an additional bit is included for activation / deactivation of SFN operation at the subband level.By providing the additional capability to activate / deactivate SFN operation at both the wideband and subband levels, communications between the base station 105 and the UE 115 may be provided more efficiently.

[0112] In some exemplary implementations, the port selection information 501 provides for broadband amplitude information 3 bits to select the quantization level (e.g. ) or provide a wideband dynamic SFN activation indicator (eg, represented by a '0' entry). Port selection information 501 provides information for subband amplitude 2 bits to select the quantization level (e.g., 1, ) or provide a subband dynamic SFN activation indicator (eg, represented by a '0' entry). The port selection information 501 also includes subband phase information The subband phase information Provide 2 bits or 3 bits to select the in-phase coefficient (e.g., 2 bits: or 3 bits: ).

[0113] Figure 66 is a block diagram illustrating a two-step CSI process configured according to one aspect of the present disclosure. After beam selection information is provided by UE 115 in a first step (not shown) of the two-step CSI process, base station 105 sends communication 600 including one CSI-RS resource 602 having two beamformed CSI-RS ports 603-604 for both sectors 1 and 2. UE 115 observes CSI-RS resource 602 to determine the type II port selection codebook precoder w k,r,l UE 115 generates a CSI report 601 including port selection information including the selected type II codebook precoder. The base station 105 can then determine whether to activate or deactivate both wideband and subband SFN for downlink transmissions 60 (e.g., PDCCH, PDSCH, etc.) on sectors 1 and 2, based on the additional bits of the type II precoder w k,r,l Includes broadband amplitude information and sub-band amplitude information Dynamic SFN activation indicator for both. The wideband and subband dynamic SFN activation indicator provides for the base station 105 to send downlink transmissions 60 using wideband / subband SFN transmissions 605 in sector 1 and wideband / subband SFN transmissions 606 in sector 2.

[0114] Those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0115] Figure 4A and Figure 4B The functional blocks and modules in may include processors, electronic devices, hardware devices, electronic components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.

[0116] Those skilled in the art will further appreciate that the various illustrative logic boxes, modules, circuits and algorithm steps described in conjunction with the disclosure herein can be implemented as electronic hardware, computer software, or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, boxes, modules, circuits and steps have been generally described above around their functionality. Whether such functionality is implemented as hardware or software depends on specific applications and the design constraints imposed on the overall system. The technician can implement the described functions in different ways for each specific application, but such implementation decisions should not be interpreted as causing to depart from the scope of the present disclosure. The technician will also easily recognize that the order or combination of components, methods or interactions described herein are merely examples, and components, methods or interactions of various aspects of the present disclosure can be combined or performed in a manner different from those shown and described herein.

[0117] Various aspects of the present disclosure may be implemented in many different ways, including methods, processes, non-transitory computer-readable media having program code recorded thereon, devices having one or more processors configured and instructed to perform the described features and functions, and the like. A first aspect of wireless communication may include: receiving one or more channel quality reference signal resources from a serving base station at a UE in each sector within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; reporting a resource selection feedback message by the UE to the serving base station, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources; receiving a CSI-RS resource at the UE, the CSI-RS resource being configured with two or more antenna ports and being selected according to the selected antenna ports identified in the resource selection feedback message. The UE comprises: a UE for transmitting a signal to a receiver using a selected channel quality resource for beamforming, wherein one antenna port of the two or more antenna ports is allocated to one sector in each sector within the reception area and another antenna port of the two or more antenna ports is allocated to another sector in each sector within the reception area; and the UE reports port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0118] The second aspect is based on the first aspect, wherein the one or more channel quality reference signal resources include one of the following: a CSI-RS resource configuration for communication within a first frequency band of FR1; or one of the following: one or more CSI-RS resource configurations or one or more SSBs for communication within a second frequency band of FR2.

[0119] The third aspect is based on the second aspect, wherein the resource selection feedback message includes one of the following: a type 1 single panel codebook CSI feedback message for communication within the first frequency band of FR1, or one of a CRI or an SSB index for communication within the second frequency band of FR2, wherein the CRI identifies a CSI-RS resource in the one or more CSI-RS resource configurations and the SSB index identifies an SSB in the one or more SSBs.

[0120] The fourth aspect includes any combination of the first to third aspects.

[0121] A fifth aspect of wireless communication includes: sending one or more channel quality reference signal resources to a served UE in each sector within a reception area of ​​the served UE at a base station, wherein each of the one or more channel quality reference signal resources includes one or more antenna ports; receiving a resource selection feedback message from the served UE by the base station, wherein the resource selection feedback message identifies the channel quality resource selected for each sector in the one or more channel quality reference signal resources; sending a CSI-RS resource at the base station, wherein the CSI-RS resource is configured with two or more antenna ports and is selected according to the signal source identified in the resource selection feedback message. The base station comprises: a base station for beamforming a selected channel quality resource, wherein one antenna port of the two or more antenna ports is allocated to one sector in each sector within the reception area and another antenna port of the two or more antenna ports is allocated to another sector in each sector within the reception area; and the base station receives port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies a wideband amplitude including one of a wideband quantization level or a wideband dynamic SFN activation indicator, and a subband amplitude including one of a subband quantization level or a subband dynamic SFN activation indicator.

[0122] The sixth aspect is based on the fifth aspect, wherein the one or more channel quality reference signal resources include one of the following: a CSI-RS resource configuration for communication within a first frequency band of FR1; or one of the following: one or more CSI-RS resource configurations or one or more SSBs for communication within a second frequency band of FR2.

[0123] The seventh aspect is based on the sixth aspect, wherein the resource selection feedback message includes one of the following items: a type 1 single panel codebook CSI feedback message for communication within the first frequency band of FR1, or one of a CRI or an SSB index for communication within the second frequency band of FR2, wherein the CRI identifies the CSI-RS resource in the one or more CSI-RS resource configurations and the SSB index identifies the SSB in the one or more SSBs.

[0124] The eighth aspect is based on the fifth aspect and also includes: the base station determines to deactivate the subband SFN transmission in the sector in response to the subband dynamic SFN activation indicator associated with the sector indicating the deactivation of the subband SFN transmission; and the base station determines to activate the subband SFN transmission in the sector in response to the subband dynamic SFN activation indicator associated with the sector indicating the activation of the subband SFN transmission.

[0125] The ninth aspect includes any combination of the fifth to eighth aspects.

[0126] The various illustrative logic blocks, modules, and circuits described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic devices, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0127] The steps of the method or algorithm described in conjunction with the disclosure herein may be directly embodied in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative, a storage medium may be integrated into a processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in a user terminal as discrete components.

[0128] In one or more exemplary designs, the described functions can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, each function can be stored on a computer-readable medium or sent by a computer-readable medium as one or more instructions or codes. Computer-readable media include computer storage media and communication media, wherein the communication media include any medium that helps to transmit a computer program from one place to another. Computer-readable storage media can be any available medium that can be accessed by a general-purpose computer or a special-purpose computer. For example, but not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage devices, or can be used to carry or store a desired program code unit with an instruction or data structure form and can be accessed by a general-purpose computer or a special-purpose computer or a general-purpose processor or a special-purpose processor. In addition, connection can be appropriately referred to as a computer-readable medium. For example, if a coaxial cable, optical fiber cable, twisted pair, or digital subscriber line (DSL) is used to transmit software from a network, a server, or other remote sources, then the coaxial cable, optical fiber cable, twisted pair, or DSL are included in the definition of the medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Optical disks, where magnetic disks typically reproduce data magnetically, while optical disks reproduce data optically using lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0129] As used herein, including in the claims, when the term "and / or" is used in a list of two or more items, it means that any one of the listed items may be taken alone, or any combination of two or more of the listed items may be taken. For example, if a composition is described as comprising components A, B, and / or C, the composition may include only A; only B; only C; include a combination of A and B; include a combination of A and C; include a combination of B and C; or include a combination of A, B, and C. Furthermore, as used herein, including in the claims, "or" as used in a list of items appended by "at least one of" indicates a disjunctive list, so that, for example, a list of "at least one of A, B, or C" means A or B or C or AB or AC or BS or ABC (i.e., A and B and C) or any of these items in any combination.

[0130] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Therefore, the disclosure is not intended to be limited to the examples and designs described herein, but is to be given the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of wireless communication performed at a user equipment (UE), include: receiving one or more channel quality reference signal resources from a serving base station on each of a plurality of sectors within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources indicates one or more antenna ports; receiving a channel state information-reference signal (CSI-RS) resource configured with two or more antenna ports and beamformed according to a channel quality reference signal resource identified in a resource selection feedback message reported to the serving base station, wherein a first antenna port of the two or more antenna ports is assigned to a first sector of the plurality of sectors within the reception area and a second antenna port of the two or more antenna ports is assigned to a second sector of the plurality of sectors within the reception area; and Reporting port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies: A broadband dynamic single frequency network (SFN) activation indicator, and a sub-band dynamic SFN activation indicator.

2. The method according to claim 1, in, The one or more channel quality reference signal resources include one or more synchronization signal blocks (SSBs) for communications within a second frequency band of a frequency range 2 (FR2).

3. The method according to claim 2, in, The resource selection feedback message includes one of the following items: A type 1 single-panel codebook CSI feedback message for communications in a first frequency band of frequency range 1 (FR1), or An SSB index for communication in the second frequency band of FR2, wherein the SSB index identifies an SSB of the one or more SSBs.

4. The method according to claim 1, in, The broadband dynamic SFN activation indicator is configured to indicate to the serving base station to activate or deactivate broadband SFN transmission in a sector corresponding to the broadband dynamic SFN activation indicator.

5. The method according to claim 4, in, The subband dynamic SFN activation indicator is configured to indicate to the serving base station to activate or deactivate subband SFN transmission in a sector corresponding to the subband dynamic SFN activation indicator.

6. A method of wireless communication performed by a base station, include: Sending one or more channel quality reference signal resources to a served user equipment (UE) on each of a plurality of sectors within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources indicates one or more antenna ports; transmitting a channel state information-reference signal (CSI-RS) resource configured with two or more antenna ports and beamformed according to a channel quality reference signal resource identified in a resource selection feedback message reported to the served UE, wherein a first antenna port of the two or more antenna ports is assigned to a first sector of the plurality of sectors within the reception area and a second antenna port of the two or more antenna ports is assigned to a second sector of the plurality of sectors within the reception area; and Receiving port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies: A broadband dynamic single frequency network (SFN) activation indicator, and a sub-band dynamic SFN activation indicator.

7. The method according to claim 6, in, The one or more channel quality reference signal resources include one of the following: a CSI-RS resource configuration for communications within a first frequency band of frequency range 1 (FR1); or One of: one or more CSI-RS resource configurations or one or more synchronization signal blocks (SSBs) for communication within a second frequency band of frequency range 2 (FR2).

8. The method according to claim 7, in, The resource selection feedback message includes one of the following items: a type 1 single panel codebook CSI feedback message for communications within said first frequency band of FR1, or One of a CSI-RS resource indicator (CRI) or an SSB index for communication within the second frequency band of FR2, wherein the CRI identifies a CSI-RS resource in the one or more CSI-RS resource configurations and the SSB index identifies an SSB in the one or more SSBs.

9. The method according to claim 6, further comprising: include: deactivating sub-band SFN transmission in a sector in response to a sub-band dynamic SFN activation indicator associated with the sector indicating deactivation of the sub-band SFN transmission; or The sub-band SFN transmission in the sector is activated in response to the sub-band dynamic SFN activation indicator associated with the sector indicating activation of sub-band SFN transmission.

10. The method according to claim 9, in, Deactivating the sub-band SFN transmission includes setting at least one bit of the sub-band dynamic SFN activation indicator to identify a quantization level associated with zero amplitude.

11. The method according to claim 6, further comprising: include: Subband SFN transmission in the sector is deactivated based on the subband dynamic SFN activation indicator.

12. The method according to claim 6, further comprising: include: In response to the sub-band dynamic SFN activation indicator, sub-band SFN transmission in the sector is activated.

13. A device configured for wireless communication, the device include: at least one processor; and at least one memory including instructions, The at least one processor is configured to execute the instructions and cause the device to: receiving one or more channel quality reference signal resources from a serving base station on each of a plurality of sectors within a reception area of ​​a user equipment (UE), wherein each of the one or more channel quality reference signal resources indicates one or more antenna ports; receiving a channel state information-reference signal (CSI-RS) resource configured with two or more antenna ports and beamformed according to a channel quality reference signal resource identified in a resource selection feedback message reported to the serving base station, wherein a first antenna port of the two or more antenna ports is assigned to a first sector of the plurality of sectors within the reception area and a second antenna port of the two or more antenna ports is assigned to a second sector of the plurality of sectors within the reception area; and Reporting port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies: A broadband dynamic single frequency network (SFN) activation indicator, and a sub-band dynamic SFN activation indicator.

14. The device according to claim 13, in, The one or more channel quality reference signal resources include One or more synchronization signal blocks (SSBs) for communications within a second frequency band of frequency range 2 (FR2).

15. The device according to claim 14, in, The resource selection feedback message includes one of the following items: A type 1 single-panel codebook CSI feedback message for communications in a first frequency band of frequency range 1 (FR1), or An SSB index for communication in the second frequency band of FR2, wherein the SSB index identifies an SSB of the one or more SSBs.

16. The device according to claim 13, in, The at least one processor is further configured to execute the instructions so that the apparatus: The resource selection feedback message is reported to the serving base station, wherein the resource selection feedback message identifies a channel quality reference signal resource of the one or more channel quality reference signal resources for each sector.

17. The device according to claim 13, further comprising: include: A transceiver is provided to receive the one or more channel quality reference signal resources and the CSI-RS resource via the transceiver, wherein the apparatus is configured as a UE.

18. A device configured for wireless communication, the device include: at least one processor; as well as at least one memory including instructions, The at least one processor is configured to execute the instructions and cause the device to: Initiating transmission of one or more channel quality reference signal resources to a served user equipment (UE) on each of a plurality of sectors within a reception area of ​​the UE, wherein each of the one or more channel quality reference signal resources indicates one or more antenna ports; initiating transmission of a channel state information-reference signal (CSI-RS) resource configured with two or more antenna ports and beamformed according to a channel quality reference signal resource identified in a resource selection feedback message reported to the served UE, wherein a first antenna port of the two or more antenna ports is assigned to a first sector of the plurality of sectors within the reception area and a second antenna port of the two or more antenna ports is assigned to a second sector of the plurality of sectors within the reception area; and Receiving port selection feedback for each sector, the port selection feedback comprising one or more in-phase coefficients and an amplitude indicator for each sector, wherein the amplitude indicator identifies: A broadband dynamic single frequency network (SFN) activation indicator, and a sub-band dynamic SFN activation indicator.

19. The device according to claim 18, in, The one or more channel quality reference signal resources include one of the following: a CSI-RS resource configuration for communications within a first frequency band of frequency range 1 (FR1); or One of: one or more CSI-RS resource configurations or one or more synchronization signal blocks (SSBs) for communication within a second frequency band of frequency range 2 (FR2).

20. The device according to claim 19, in, The resource selection feedback message includes one of the following items: a type 1 single panel codebook CSI feedback message for communications within said first frequency band of FR1, or One of a CSI-RS resource indicator (CRI) or an SSB index for communication within the second frequency band of FR2, wherein the CRI identifies a CSI-RS resource in the one or more CSI-RS resource configurations and the SSB index identifies an SSB in the one or more SSBs.

21. The apparatus of claim 18, further comprising configuration of the one or more processors to: Determining, by a base station, to deactivate the sub-band SFN transmission in the sector in response to the sub-band dynamic SFN activation indicator associated with the sector indicating deactivation of sub-band SFN transmission; and The activation of the sub-band SFN transmission in the sector is determined by the base station in response to the sub-band dynamic SFN activation indicator associated with the sector indicating activation of sub-band SFN transmission.

22. The device according to claim 18, in, The at least one processor is further configured to execute the instructions and cause the apparatus to: The resource selection feedback message is received from the served UE, wherein the resource selection feedback message identifies a channel quality reference signal resource among the one or more channel quality reference signal resources for each sector.

23. The device according to claim 18, further comprising: include: A transceiver configured to send the one or more channel quality reference signal resources, send the CSI-RS resources, and receive the port selection feedback, wherein the apparatus is configured as a base station.

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