WO2014198068A1 - Procédés et appareil conçus pour le précodage linéaire dans les systèmes mimo globaux - Google Patents

Procédés et appareil conçus pour le précodage linéaire dans les systèmes mimo globaux Download PDF

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Publication number
WO2014198068A1
WO2014198068A1 PCT/CN2013/077277 CN2013077277W WO2014198068A1 WO 2014198068 A1 WO2014198068 A1 WO 2014198068A1 CN 2013077277 W CN2013077277 W CN 2013077277W WO 2014198068 A1 WO2014198068 A1 WO 2014198068A1
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WO
WIPO (PCT)
Prior art keywords
antenna ports
antenna
feedback
specific
antenna elements
Prior art date
Application number
PCT/CN2013/077277
Other languages
English (en)
Inventor
Yu Zhang
Wei Chao
Peng Cheng
Neng Wang
Jilei Hou
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2013/077277 priority Critical patent/WO2014198068A1/fr
Priority to US14/786,854 priority patent/US10461824B2/en
Priority to EP14803412.7A priority patent/EP3005599B1/fr
Priority to PCT/CN2014/078633 priority patent/WO2014190903A1/fr
Priority to EP20156320.2A priority patent/EP3672126B1/fr
Priority to ES14803412T priority patent/ES2808566T3/es
Priority to HUE14803412A priority patent/HUE050086T2/hu
Priority to CN201480030701.8A priority patent/CN105247809B/zh
Priority to ES20156320T priority patent/ES2894923T3/es
Priority to JP2016515635A priority patent/JP6466415B2/ja
Publication of WO2014198068A1 publication Critical patent/WO2014198068A1/fr
Priority to JP2018141342A priority patent/JP6847897B2/ja
Priority to US16/573,304 priority patent/US10879972B2/en
Priority to US16/599,018 priority patent/US11283497B2/en
Priority to JP2020160978A priority patent/JP7102479B2/ja
Priority to JP2022009203A priority patent/JP7086314B2/ja

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]

Definitions

  • the present disclosure relates generally to wireless communication, and more particularly, processing in FD-MIMO systems
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power).
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDM A) systems, single-carrier frequency divisional multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDM A orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency divisional multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP Third Generation Partnership Project
  • DL downlink
  • UL uplink
  • MIMO multiple-input multiple-output
  • the method generally includes generating a port precoding matrix which compress a larger number of antenna elements to a smaller number of antenna ports, transmitting UE-specific port reference signals to a user equipment (UE) using the port precoding matrix, receiving feedback regarding channel state information (CSI) measured by the UE based on the UE- specific port reference signals, mapping multiple data layers to UE- specific antenna ports based on the CSI, mapping each of the UE-specific antenna ports to physical antenna elements, and transmitting data to the UE, based on the mapping of the multiple data layers and the mapping of antenna ports to physical antenna elements.
  • CSI channel state information
  • aspects of the present disclosure provide a method for wireless communication by a user equipment (UE).
  • the method generally includes receiving UE-specific port reference signals transmitted by a base station (BS) using a long-term port precoding matrix which compress a large number of antenna elements to a small number of antenna ports, measuring and quantizing short-term CSI based on the UE-specific port reference signals, and transmitting feedback regarding the (quantized) short-term CSI to the BS.
  • BS base station
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a diagram illustrating an example of a network architecture.
  • FIG. 2 is a diagram illustrating an example of an access network.
  • FIG. 3 is a diagram illustrating an example of a frame structure for use in an access network.
  • FIG. 4 shows an exemplary format for the UL in LTE.
  • FIG. 5 is a diagram illustrating an example of a radio protocol architecture for the user and control planes.
  • FIG. 6 is a diagram illustrating an example of an evolved Node B and user equipment in an access network.
  • FIG. 7 illustrates an example of a traditional MIMO with one-dimensional array.
  • FIG. 8 illustrates an example FD-MIMO with two-dimensional array, according to aspects of the present disclosure.
  • FIG. 9 illustrates example components used in accordance with methods described herein.
  • FIG. 10 illustrates an example components used in accordance with methods described herein.
  • FIG. 11 illustrates an example sub-array partitions, according to aspects of the present disclosure.
  • FIGs. 12-18 illustrate various sub-array partitions, according to aspects of the present disclosure.
  • FIG. 19 illustrates example operations performed, for example, by a base station (BS), in accordance with aspects of the present disclosure.
  • BS base station
  • FIG. 20 illustrates example operations performed, for example, by a user equipment (UE) in accordance with aspects of the present disclosure.
  • UE user equipment
  • processors include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • One or more processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer- readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • Disk and disc includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • FIG. 1 is a diagram illustrating an LTE network architecture 100.
  • the LTE network architecture 100 may be referred to as an Evolved Packet System (EPS) 100.
  • the EPS 100 may include one or more user equipment (UE) 102, an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) 104, an Evolved Packet Core (EPC) 110, a Home Subscriber Server (HSS) 120, and an Operator's IP Services 122.
  • the EPS can interconnect with other access networks, but for simplicity those entities/interfaces are not shown.
  • the EPS provides packet- switched services, however, as those skilled in the art will readily appreciate, the various concepts presented throughout this disclosure may be extended to networks providing circuit-switched services.
  • the E-UTRAN includes the evolved Node B (eNB) 106 and other eNBs 108.
  • the eNB 106 provides user and control plane protocol terminations toward the UE 102.
  • the eNB 106 may be connected to the other eNBs 108 via an X2 interface (e.g., backhaul).
  • the eNB 106 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), or some other suitable terminology.
  • the eNB 106 provides an access point to the EPC 110 for a UE 102.
  • Examples of UEs 102 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • the UE 102 may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • the eNB 106 is connected by an SI interface to the EPC 110.
  • the EPC 110 includes a Mobility Management Entity (MME) 112, other MMEs 114, a Serving Gateway 116, and a Packet Data Network (PDN) Gateway 118.
  • MME Mobility Management Entity
  • PDN Packet Data Network
  • the MME 112 is the control node that processes the signaling between the UE 102 and the EPC 110. Generally, the MME 112 provides bearer and connection management. All user IP packets are transferred through the Serving Gateway 116, which itself is connected to the PDN Gateway 118. The PDN Gateway 118 provides UE IP address allocation as well as other functions. The PDN Gateway 118 is connected to the Operator's IP Services 122.
  • the Operator's IP Services 122 may include the Internet, the Intranet, an IP Multimedia Subsystem (IMS), and a PS Streaming Service (PSS).
  • IMS IP Multimedia Subsystem
  • PSS PS Streaming Service
  • FIG. 2 is a diagram illustrating an example of an access network 200 in an LTE network architecture.
  • the access network 200 is divided into a number of cellular regions (cells) 202.
  • One or more lower power class eNBs 208 may have cellular regions 210 that overlap with one or more of the cells 202.
  • a lower power class eNB 208 may be referred to as a remote radio head (RRH).
  • the lower power class eNB 208 may be a femto cell (e.g., home eNB (HeNB)), pico cell, or micro cell.
  • HeNB home eNB
  • the macro eNBs 204 are each assigned to a respective cell 202 and are configured to provide an access point to the EPC 110 for all the UEs 206 in the cells 202. There is no centralized controller in this example of an access network 200, but a centralized controller may be used in alternative configurations.
  • the eNBs 204 are responsible for all radio related functions including radio bearer control, admission control, mobility control, scheduling, security, and connectivity to the serving gateway 116.
  • the modulation and multiple access scheme employed by the access network 200 may vary depending on the particular telecommunications standard being deployed.
  • OFDM is used on the DL
  • SC-FDMA is used on the UL to support both frequency division duplexing (FDD) and time division duplexing (TDD).
  • FDD frequency division duplexing
  • TDD time division duplexing
  • FDD frequency division duplexing
  • TDD time division duplexing
  • EV-DO Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • EV-DO and UMB are air interface standards promulgated by the 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards and employs CDMA to provide broadband Internet access to mobile stations. These concepts may also be extended to Universal Terrestrial Radio Access (UTRA) employing Wideband-CDMA (W-CDMA) and other variants of CDMA, such as TD- SCDMA; Global System for Mobile Communications (GSM) employing TDM A; and Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDM employing OFDMA.
  • UTRA Universal Terrestrial Radio Access
  • W-CDMA Wideband-CDMA
  • GSM Global System for Mobile Communications
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM employing OF
  • UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from the 3GPP organization.
  • CDMA2000 and UMB are described in documents from the 3GPP2 organization.
  • the actual wireless communication standard and the multiple access technology employed will depend on the specific application and the overall design constraints imposed on the system.
  • the eNBs 204 may have multiple antennas supporting MIMO technology.
  • MIMO technology enables the eNBs 204 to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity.
  • Spatial multiplexing may be used to transmit different streams of data simultaneously on the same frequency.
  • the data steams may be transmitted to a single UE 206 to increase the data rate or to multiple UEs 206 to increase the overall system capacity. This is achieved by spatially precoding each data stream (i.e., applying a scaling of an amplitude and a phase) and then transmitting each spatially precoded stream through multiple transmit antennas on the DL.
  • the spatially precoded data streams arrive at the UE(s) 206 with different spatial signatures, which enables each of the UE(s) 206 to recover the one or more data streams destined for that UE 206.
  • each UE 206 transmits a spatially precoded data stream, which enables the eNB 204 to identify the source of each spatially precoded data stream.
  • Spatial multiplexing is generally used when channel conditions are good.
  • beamforming may be used to focus the transmission energy in one or more directions. This may be achieved by spatially precoding the data for transmission through multiple antennas. To achieve good coverage at the edges of the cell, a single stream beamforming transmission may be used in combination with transmit diversity.
  • OFDM is a spread- spectrum technique that modulates data over a number of subcarriers within an OFDM symbol.
  • the subcarriers are spaced apart at precise frequencies. The spacing provides "orthogonality" that enables a receiver to recover the data from the subcarriers.
  • a guard interval e.g., cyclic prefix
  • the UL may use SC- FDMA in the form of a DFT-spread OFDM signal to compensate for high peak-to- average power ratio (PAPR).
  • PAPR peak-to- average power ratio
  • FIG. 3 is a diagram 300 illustrating an example of a DL frame structure in LTE.
  • a frame (10 ms) may be divided into 10 equally sized sub-frames. Each sub- frame may include two consecutive time slots.
  • a resource grid may be used to represent two time slots, each time slot including a resource block.
  • the resource grid is divided into multiple resource elements.
  • a resource block contains 12 consecutive subcarriers in the frequency domain and, for a normal cyclic prefix in each OFDM symbol, 7 consecutive OFDM symbols in the time domain, or 84 resource elements.
  • Some of the resource elements, as indicated as R 302, 304, include DL reference signals (DL-RS).
  • DL-RS DL reference signals
  • the DL-RS include Cell-specific RS (CRS) (also sometimes called common RS) 302 and UE-specific RS (UE-RS) 304.
  • UE-RS 304 are transmitted only on the resource blocks upon which the corresponding physical DL shared channel (PDSCH) is mapped.
  • PDSCH physical DL shared channel
  • the number of bits carried by each resource element depends on the modulation scheme. Thus, the more resource blocks that a UE receives and the higher the modulation scheme, the higher the data rate for the UE.
  • FIG. 4 is a diagram 400 illustrating an example of an UL frame structure in LTE.
  • the available resource blocks for the UL may be partitioned into a data section and a control section.
  • the control section may be formed at the two edges of the system bandwidth and may have a configurable size.
  • the resource blocks in the control section may be assigned to UEs for transmission of control information.
  • the data section may include all resource blocks not included in the control section.
  • the UL frame structure results in the data section including contiguous subcarriers, which may allow a single UE to be assigned all of the contiguous subcarriers in the data section.
  • a UE may be assigned resource blocks 410a, 410b in the control section to transmit control information to an eNB.
  • the UE may also be assigned resource blocks 420a, 420b in the data section to transmit data to the eNB.
  • the UE may transmit control information in a physical UL control channel (PUCCH) on the assigned resource blocks in the control section.
  • the UE may transmit only data or both data and control information in a physical UL shared channel (PUSCH) on the assigned resource blocks in the data section.
  • a UL transmission may span both slots of a subframe and may hop across frequency.
  • a set of resource blocks may be used to perform initial system access and achieve UL synchronization in a physical random access channel (PRACH) 430.
  • the PRACH 430 carries a random sequence and cannot carry any UL data/signaling.
  • Each random access preamble occupies a bandwidth corresponding to six consecutive resource blocks.
  • the starting frequency is specified by the network. That is, the transmission of the random access preamble is restricted to certain time and frequency resources. There is no frequency hopping for the PRACH.
  • the PRACH attempt is carried in a single subframe (1 ms) or in a sequence of few contiguous subframes and a UE can make only a single PRACH attempt per frame (10 ms).
  • FIG. 5 is a diagram 500 illustrating an example of a radio protocol architecture for the user and control planes in LTE.
  • the radio protocol architecture for the UE and the eNB is shown with three layers: Layer 1, Layer 2, and Layer 3.
  • Layer 1 (LI layer) is the lowest layer and implements various physical layer signal processing functions.
  • the LI layer will be referred to herein as the physical layer 506.
  • Layer 2 (L2 layer) 508 is above the physical layer 506 and is responsible for the link between the UE and eNB over the physical layer 506.
  • the L2 layer 508 includes a media access control (MAC) sublayer 510, a radio link control (RLC) sublayer 512, and a packet data convergence protocol (PDCP) 514 sublayer, which are terminated at the eNB on the network side.
  • MAC media access control
  • RLC radio link control
  • PDCP packet data convergence protocol
  • the UE may have several upper layers above the L2 layer 508 including a network layer (e.g., IP layer) that is terminated at the PDN gateway 118 on the network side, and an application layer that is terminated at the other end of the connection (e.g., far end UE, server, etc.).
  • IP layer e.g., IP layer
  • the PDCP sublayer 514 provides multiplexing between different radio bearers and logical channels.
  • the PDCP sublayer 514 also provides header compression for upper layer data packets to reduce radio transmission overhead, security by ciphering the data packets, and handover support for UEs between eNBs.
  • the RLC sublayer 512 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to hybrid automatic repeat request (HARQ).
  • HARQ hybrid automatic repeat request
  • the MAC sublayer 510 provides multiplexing between logical and transport channels.
  • the MAC sublayer 510 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell among the UEs.
  • the MAC sublayer 510 is also responsible for HARQ operations.
  • the radio protocol architecture for the UE and eNB is substantially the same for the physical layer 506 and the L2 layer 508 with the exception that there is no header compression function for the control plane.
  • the control plane also includes a radio resource control (RRC) sublayer 516 in Layer 3 (L3 layer).
  • RRC sublayer 516 is responsible for obtaining radio resources (i.e., radio bearers) and for configuring the lower layers using RRC signaling between the eNB and the UE.
  • FIG. 6 is a block diagram of an eNB 610 in communication with a UE 650 in an access network.
  • upper layer packets from the core network are provided to a controller/processor 675.
  • the controller/processor 675 implements the functionality of the L2 layer.
  • the controller/processor 675 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocations to the UE 650 based on various priority metrics.
  • the controller/processor 675 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the UE 650.
  • the TX processor 616 implements various signal processing functions for the LI layer (i.e., physical layer).
  • the signal processing functions include coding and interleaving to facilitate forward error correction (FEC) at the UE 650 and mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)).
  • FEC forward error correction
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • Each stream is then mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 674 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 650.
  • Each spatial stream is then provided to a different antenna 620 via a separate transmitter 618TX.
  • Each transmitter 618TX modulates an RF carrier with a respective spatial stream for transmission.
  • each receiver 654RX receives a signal through its respective antenna 652. Each receiver 654RX recovers information modulated onto an RF carrier and provides the information to the receiver (RX) processor 656.
  • the RX processor 656 implements various signal processing functions of the LI layer.
  • the RX processor 656 performs spatial processing on the information to recover any spatial streams destined for the UE 650. If multiple spatial streams are destined for the UE 650, they may be combined by the RX processor 656 into a single OFDM symbol stream.
  • the RX processor 656 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal is recovered and demodulated by determining the most likely signal constellation points transmitted by the eNB 610. These soft decisions may be based on channel estimates computed by the channel estimator 658.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the eNB 610 on the physical channel.
  • the data and control signals are then provided to the controller/processor 659.
  • the controller/processor 659 implements the L2 layer.
  • the controller/processor can be associated with a memory 660 that stores program codes and data.
  • the memory 660 may be referred to as a computer-readable medium.
  • the control/processor 659 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the core network.
  • the upper layer packets are then provided to a data sink 662, which represents all the protocol layers above the L2 layer.
  • Various control signals may also be provided to the data sink 662 for L3 processing.
  • the controller/processor 659 is also responsible for error detection using an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support HARQ operations.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • a data source 667 is used to provide upper layer packets to the controller/processor 659.
  • the data source 667 represents all protocol layers above the L2 layer.
  • the controller/processor 659 implements the L2 layer for the user plane and the control plane by providing header compression, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations by the eNB 610.
  • the controller/processor 659 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the eNB 610.
  • Channel estimates derived by a channel estimator 658 from a reference signal or feedback transmitted by the eNB 610 may be used by the TX processor 668 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 668 are provided to different antenna 652 via separate transmitters 654TX. Each transmitter 654TX modulates an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the eNB 610 in a manner similar to that described in connection with the receiver function at the UE 650.
  • Each receiver 618RX receives a signal through its respective antenna 620.
  • Each receiver 618RX recovers information modulated onto an RF carrier and provides the information to a RX processor 670.
  • the RX processor 670 may implement the LI layer.
  • the controller/processor 675 implements the L2 layer.
  • the controller/processor 675 can be associated with a memory 676 that stores program codes and data.
  • the memory 676 may be referred to as a computer-readable medium.
  • the control/processor 675 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the UE 650.
  • Upper layer packets from the controller/processor 675 may be provided to the core network.
  • the controller/processor 675 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • Full-dimensional MIMO (FD-MIMO) technology may greatly improve system capacity by using a two-dimensional antenna array with up to 64 antenna ports at an eNB. Benefits of using up to 64 antenna ports at the eNB may include very small inter-cell interference as well as very high beamforming gain.
  • the use of a two- dimensional antenna array allows UE- specific beamforming in both azimuth and elevation. Each antenna may be connected to its own RF transceiver.
  • MIMO channel state information (CSI) about the full channel is needed by the eNB.
  • the CSI is mainly acquired at the eNB by exploiting the bi-directional channel reciprocity.
  • the CSI is usually measured and quantized at the UE side and is then fed back to the eNB via a dedicated uplink channel.
  • the size of the codebook used for CSI quantization increases as the number of transmit antennas increases.
  • each antenna is connected to its own RF transceiver.
  • aspects described herein adopt two- stage precoding to reduce the overhead caused by CSI feedback in FD-MIMO systems.
  • the structure of two- dimensional arrays and the channel reciprocity are exploited.
  • UL channel estimation is used to acquire a long-term port precoding matrix which compresses the large number of antenna elements to a small number of antenna ports.
  • the eNB uses the port precoding matrix to transmit UE- specific port reference signals.
  • the UE measures the short-term CSI on a small number of antenna ports instead of the large number of antenna elements.
  • the UE then quantize the short-term CSI and feeds back it to the eNB.
  • the eNB uses the quantized short-term CSI to map multiple data layers to UE specific antenna ports and followed by a second stage precoding which maps the each antenna port to antenna elements.
  • some related signaling are described in more detailed herein.
  • FIG. 7 illustrates an example of a traditional MIMO with one-dimensional array. As illustrated, UE-specific beamforming may be performed in azimuth only. A common elevation tilting may be applied.
  • FIG. 8 illustrates an example FD-MIMO with two-dimensional array, according to aspects of the present disclosure. As illustrated, UE-specific beamforming may be performed in both azimuth and elevation.
  • the number of transmit antennas at the eNB may be increased 8 to 10 folds as compared to legacy 8TX MIMO systems. These extra transmit antennas brings larger beamforming gain and sprays less interference to neighboring cells.
  • Traditional one-shot beamforming/precoding methods rely on the availability of the channel state information (CSI) of the whole transmit dimension (e.g., the instantaneous/statistical knowledge of the channel from each eNB transmit antenna to one or more UE receive antennas are needed.) Such CSI is obtained either by UE PMI/RI feedback or by exploiting channel reciprocity.
  • CSI channel state information
  • the UE PMI/RI reporting is based on the pilot-aided estimation of the DL full channel.
  • the pilot (or common reference signals) overhead and the complexity of DL channel estimation may be proportional to the number of eNB antennas.
  • the complexity of PMI/RI selection may increase as the number of eNB antennas increases.
  • the channel reciprocity approach is limited by UE capability and the UL channel estimation error. For a low-end UE which cannot support sounding antenna switching, short-term CSI about the full channel is unavailable.
  • the complexity of UL channel estimation and the complexity of calculating beamformer/precoder may be proportional to the number of eNB antennas.
  • FIG. 9 illustrates example components used in accordance with methods described herein. Aspects of the present disclosure contain: a Hybrid CSI Acquisition module, to provide precoders for data/pilot precoding, a Data Precoding module, to precode data streams to antenna elements, and a Pilot Precoding module, to precode pilot sequence to antenna elements.
  • a Hybrid CSI Acquisition module to provide precoders for data/pilot precoding
  • a Data Precoding module to precode data streams to antenna elements
  • a Pilot Precoding module to precode pilot sequence to antenna elements.
  • both data and pilots are transmitted on a set of antenna ports.
  • the number of antenna ports is much less than the number of antenna elements. Consequently, the overhead/computational complexity can be reduced significantly.
  • the Hybrid CSI Acquisition module of FIG. 9 generates two precoders, a port precoder and a layer precoder.
  • the port precoder and layer precoder are illustrated in FIG. 10.
  • the port precoder is used to map a small number of antenna ports to numerous antenna elements. It is obtained by exploiting (long-term) UL channel information.
  • the layer precoder is used to map data layers to antenna ports. It is obtained by UE feedback in terms of PMI/RI.
  • the reported PMI/RI is selected from a predefined codebook based on the estimated DL channel on antenna ports.
  • the estimation of DL channel on an antenna port is obtained by the associated the precoded pilot.
  • Data precoding (data stream precoding) of FIG. 9, is preformed in two consecutive stages, as detailed in FIG. 10.
  • Stage 1 is Layer-to-port mapping where L data streams are first precoded by an L x P layer precoder. The layer precoder maps L data layers to P antenna ports.
  • Stage 2 is Port-to-element mapping where P antenna ports are then precoded by a P x M port precoder. The port precoder maps P antenna ports to M antenna elements. Pilot sequences for estimating the channels on P antenna ports are precoded by the same port precoder.
  • the t usted lit channel is denote * is 3 ⁇ 4L t mN ⁇ N* ⁇ N l$ the number of U antennas transmitting uplink pilots.
  • the yer precoder is given by F - arg map ⁇ .(ff )
  • antenna elements may be cross-polarized.
  • elements are aligned in 8 rows by 8 columns.
  • FIGs. 12-18 and pages 8-14 of the APPENDIX illustrate various sub-array partitions according to aspects of the present disclosure.
  • FIG. 12 illustrates an example Type-1 sub-array, according to aspects of the present disclosure.
  • FIG. 13 illustrates an example Type-2 sub-array, according to aspects of the present disclosure.
  • FIG. 14 illustrates an example Type-4a sub-array, according to aspects of the present disclosure.
  • FIG. 15 illustrates an example Type-4b sub-array, according to aspects of the present disclosure.
  • FIG. 16 illustrates an example Type-8a sub-array, according to aspects of the present disclosure.
  • FIG. 17 illustrates an example Type-8b sub-array, according to aspects of the present disclosure.
  • FIG. 18 illustrates an example Type-8c sub-array, according to aspects of the present disclosure.
  • UE-specific parameters including the type of sub-array partition and the CSI resource configuration may be semi-dynamically configured.
  • the type of sub-array partition may include the structure of antenna port and the number of antenna ports.
  • the UE may select one out of several predefined codebooks and use the selected codebook to report the PMI/RI for the layer precoder.
  • UEs may be divided into multiple categories according to their capability of supporting multiple types of sub-array partition and the associated codebooks.
  • low-end UEs may support limited types of sub-array partition.
  • FIG. 19 illustrates example operations 1900 performed, for example, by a base station (BS) according to aspects of the present disclosure.
  • the BS may generate a port precoding matrix which compress a larger number of antenna elements to a smaller number of antenna ports.
  • the BS may transmit UE-specific port reference signals to a user equipment (UE) using the port precoding matrix.
  • the BS may receive feedback regarding channel state information (CSI) measured by the UE based on the UE- specific port reference signals.
  • the BS may map multiple data layers to UE-specific antenna ports based on the CSI.
  • the BS may map each of the UE-specific antenna ports to physical antenna elements.
  • the BS may transmit data to the UE, based on the mapping of the multiple data layers and the mapping of antenna ports to physical antenna elements.
  • the port precoding matrix is generated based on (UL) channel estimation and the physical antenna elements are arranged in a multidimensional array.
  • the BS may further map pilot sequences to UE- specific antenna ports.
  • the feedback may comprise quantized feedback comprising at least one of a preferred matrix indicator (PMI) and a rank indication (RI).
  • the quantized feedback may be selected from a predefined codebook.
  • the BS may also transmit, to the UE, information regarding a sub-array partition of the antenna elements.
  • the information may comprise at least one of a type of sub-array partition, a structure of antenna ports, or a number of antenna ports.
  • the UEs may be divided into multiple categories according to their capability of supporting multiple types of sub-array partition and the associated codebooks. Certain types of UEs may support less types of sub-array partition than other types of UEs.
  • FIG. 20 illustrates example operations 2000 performed, for example, by a user equipment (UE), according to aspects of the present disclosure.
  • the UE may receive UE- specific port reference signals transmitted by a base station using a long-term port precoding matrix which compress a large number of antenna elements to a small number of antenna ports.
  • the UE may measure and quantize short-term CSI based on the UE-specific port reference signals.
  • the UE may transmit feedback regarding the (quantized) short-term CSI to the BS.
  • the feedback may comprise quantized feedback comprising at least one of a preferred matrix indicator (PMI) and a rank indication (RI).
  • the quantized feedback may be selected from a predefined codebook.
  • the UE may select, based on the information, one of a plurality of predefined codebooks, and may use the selected codebook to report the feedback. .
  • the UE may receive information regarding a sub-array partition of the antenna elements.
  • the information may comprise at least one of a type of sub-array partition, a structure of antenna ports, and a number of antenna ports.
  • aspects of the present disclosure provide techniques to improve system capacity of FD-MIMO technology by using a two-dimensional antenna array with up to 64 antenna ports at the eNB.
  • the use of a two-dimensional antenna array allows UE-specific beamforming in both azimuth and elevation.
  • the FD-MIMO technology could greatly improve system
  • Very high hearn forming gain can be done in azimuth only. A common elevation tilting is applied.
  • the FD- irVIO is a study item for 3GPP Rel ' 12,
  • Each antenna is connected to its own RF transceiver.
  • Figure 2 Full-dimensional MIMO w/ two- dimensional array.
  • UE-specific beamformir can be done in both azimuth and elevation.
  • the number of transmit antennas at the eNB is increased 8 to 10 folds as compared to legacy 8TX Ml MO systems. These extra transmit antennas brings larger beamforming gain and spays less interference to neighboring cells.
  • CSI channel state information
  • the UE PMI/RI reporting is based on the pilot-aided estimation of the DL full channel.
  • the pilot (or common reference signals) overhead and the complexity of DL channel estimation is proportional to the number of eNB antennas.
  • the channel reciprocity approach is limited by UE capability and the UL channel estimation error.
  • beamformer/precoder are proportional to the number of eNB antennas.
  • the main challenges of supporting FD-MIMO is to design efficient beamforming/precoding algorithms and associated CSI acquisition schemes.
  • the proposed method contains the following compone
  • the hybrid CSI acquisition unit generates two precoders
  • Port precoder is used to map a small number of antenna ports to numerous antenna elements.
  • 3 ⁇ 4 Layer precoder is used to map data layers to antenna ports
  • the reported PMI/R1 is selected from a
  • predefined code book based on the estimated DL channel on ante na ports.
  • the data stream preceding is performed in two consecutive stages,
  • L data streams are first precoded by an L x P layer precoder.
  • the layer precoder maps L data layers to P antenna ports,
  • P antenna ports are then precoded by a P x M port precoder,
  • the element precoder maps P antenna ports to M antenna elements.
  • the pilot sequences for estimating the channels on P antenna ports are precoded by the same port precoder.
  • the following U E-specific parameters may be semi- dynamically configured.
  • Low-end UEs may support limited types of sub-array partition.

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Abstract

Selon certains aspects, la présente invention concerne des procédés et un appareil conçus pour le précodage linéaire dans les systèmes MIMO globaux (FD-MIMO). Selon des aspects, une BS peut générer une matrice de précodage de ports qui réduit un certain nombre d'éléments d'antenne à un plus petit nombre de ports d'antenne, transmettre à un équipement utilisateur (UE) des signaux de référence de ports spécifiques de l'UE au moyen de la matrice de précodage de ports, recevoir un retour concernant des informations d'état de canal (CSI) mesurées par l'UE sur la base des signaux de référence de ports spécifiques de l'UE, mettre plusieurs couches de données en correspondance avec les ports d'antenne spécifiques de l'UE sur la base des CSI, mettre chacun des ports d'antenne spécifiques de l'UE en correspondance avec des éléments d'antenne physiques, et transmettre des données à l'UE, sur la base de la mise en correspondance des couches de données et de la mise en correspondance des ports d'antenne et des éléments d'antenne physiques.
PCT/CN2013/077277 2013-05-31 2013-06-14 Procédés et appareil conçus pour le précodage linéaire dans les systèmes mimo globaux WO2014198068A1 (fr)

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PCT/CN2013/077277 WO2014198068A1 (fr) 2013-06-14 2013-06-14 Procédés et appareil conçus pour le précodage linéaire dans les systèmes mimo globaux
CN201480030701.8A CN105247809B (zh) 2013-05-31 2014-05-28 全维mimo系统中的线性预编码和动态垂直扇区化
ES20156320T ES2894923T3 (es) 2013-05-31 2014-05-28 Precodificación lineal en sistemas MIMO de dimensión completa
PCT/CN2014/078633 WO2014190903A1 (fr) 2013-05-31 2014-05-28 Pré-codage linéaire dans des systèmes mimo pleine dimension et sectorisation verticale dynamique
EP20156320.2A EP3672126B1 (fr) 2013-05-31 2014-05-28 Pré-codage linéaire dans des systèmes mimo pleine dimension
ES14803412T ES2808566T3 (es) 2013-05-31 2014-05-28 Precodificación lineal en sistemas MIMO de dimensión completa
HUE14803412A HUE050086T2 (hu) 2013-05-31 2014-05-28 Lineáris elõkódolás teljes dimenziójú MIMO rendszerekben
US14/786,854 US10461824B2 (en) 2013-05-31 2014-05-28 Linear precoding in full-dimensional MIMO systems and dynamic vertical sectorization
EP14803412.7A EP3005599B1 (fr) 2013-05-31 2014-05-28 Pré-codage linéaire dans des systèmes mimo pleine dimension
JP2016515635A JP6466415B2 (ja) 2013-05-31 2014-05-28 全次元ｍｉｍｏシステムにおける線形プリコーディングと動的垂直セクタ化
JP2018141342A JP6847897B2 (ja) 2013-05-31 2018-07-27 全次元ｍｉｍｏシステムにおける線形プリコーディングと動的垂直セクタ化
US16/573,304 US10879972B2 (en) 2013-05-31 2019-09-17 Linear precoding in full-dimensional MIMO systems and dynamic vertical sectorization
US16/599,018 US11283497B2 (en) 2013-05-31 2019-10-10 Linear precoding in full-dimensional MIMO systems and dynamic vertical sectorization
JP2020160978A JP7102479B2 (ja) 2013-05-31 2020-09-25 全次元ｍｉｍｏシステムにおける線形プリコーディングと動的垂直セクタ化
JP2022009203A JP7086314B2 (ja) 2013-05-31 2022-01-25 全次元ｍｉｍｏシステムにおける線形プリコーディングと動的垂直セクタ化

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WO2018219328A1 (fr) * 2017-05-31 2018-12-06 华为技术有限公司 Procédé de mise en correspondance de port d'antenne et dispositif de réseau
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WO2020119715A1 (fr) * 2018-12-11 2020-06-18 Qualcomm Incorporated Rétroaction de csi compressées pour ressources de fréquence non contiguës
US11464017B1 (en) 2021-03-25 2022-10-04 At&T Intellectual Property I, L.P. Facilitation of beamforming utilizing interpolation for 5G or other next generation network

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