WO2017190356A1 - Amélioration de livres de codes de combinaison linéaire en fd-mimo - Google Patents

Amélioration de livres de codes de combinaison linéaire en fd-mimo Download PDF

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Publication number
WO2017190356A1
WO2017190356A1 PCT/CN2016/081310 CN2016081310W WO2017190356A1 WO 2017190356 A1 WO2017190356 A1 WO 2017190356A1 CN 2016081310 W CN2016081310 W CN 2016081310W WO 2017190356 A1 WO2017190356 A1 WO 2017190356A1
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WIPO (PCT)
Prior art keywords
pmi
precoded
beams
base station
csi
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PCT/CN2016/081310
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English (en)
Inventor
Liangming WU
Chao Wei
Yu Zhang
Bo Chen
Neng Wang
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Qualcomm Incorporated
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Priority to PCT/CN2016/081310 priority Critical patent/WO2017190356A1/fr
Publication of WO2017190356A1 publication Critical patent/WO2017190356A1/fr

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    • 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
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas 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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to enhancement of linear combination codebooks in full dimension multiple input, multiple output (FD-MIMO) systems.
  • FD-MIMO full dimension multiple input, multiple output
  • Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • UTRAN Universal Terrestrial Radio Access Network
  • the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS) , a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • 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.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal FDMA
  • SC-FDMA Single-Carrier FDMA
  • a wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs) .
  • a UE may communicate with a base station via downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the base station to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the base station.
  • a base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE.
  • a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters.
  • RF radio frequency
  • a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.
  • a method of wireless communication includes performing channel state information (CSI) measurements on a plurality of signals received from a serving base station, reporting a first precoding matrix indicator (PMI) to the serving base station, wherein the first PMI includes a plurality of wideband parameters that identify two discrete Fourier transform (DFT) beams for a linear combination, wherein the two DFT beams are selected from a plurality of DFT beams forming the plurality of signals, reporting a second PMI to the serving base station, wherein the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams, and receiving precoded transmissions from the serving base station, wherein the precoded transmissions are precoded using the linear combination of the two DFT beams.
  • CSI channel state information
  • a method of wireless communication includes performing CSI on a plurality of signals from a serving base station, reporting a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, reporting a second PMI to the serving base station, wherein the second PMI includes first and second parameters that identify a primary beam and a secondary beam from the grid of beams determined from the first PMI, and receiving precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on one or more of the two DFT beams.
  • a method of wireless communication includes performing CSI measurements on a plurality of signals from a serving base station, reporting a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, reporting a second PMI to the serving base station, wherein the second PMI includes a first parameter that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams, and receiving precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • an apparatus configured for wireless communication includes means for performing CSI measurements on a plurality of signals received from a serving base station, means for reporting a first PMI to the serving base station, wherein the first PMI includes a plurality of wideband parameters that identify two DFT beams for a linear combination, wherein the two DFT beams are selected from a plurality of DFT beams forming the plurality of signals, means for reporting a second PMI to the serving base station, wherein the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams, and means for receiving precoded transmissions from the serving base station, wherein the precoded transmissions are precoded using the linear combination of the two DFT beams.
  • an apparatus configured for wireless communication includes means for performing CSI on a plurality of signals from a serving base station, means for reporting a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, means for reporting a second PMI to the serving base station, wherein the second PMI includes first and second parameters that identify a primary beam and a secondary beam from the grid of beams determined from the first PMI, and means for receiving precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on one or more of the two DFT beams.
  • an apparatus configured for wireless communication includes means for performing CSI measurements on a plurality of signals from a serving base station, means for reporting a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, means for reporting a second PMI to the serving base station, wherein the second PMI includes a first parameter that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams, and means for receiving precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • a non-transitory computer-readable medium having program code recorded thereon.
  • the program code further includes code to perform CSI measurements on a plurality of signals received from a serving base station, code to report a first PMI to the serving base station, wherein the first PMI includes a plurality of wideband parameters that identify two DFT beams for a linear combination, wherein the two DFT beams are selected from a plurality of DFT beams forming the plurality of signals, code to report a second PMI to the serving base station, wherein the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams, and code to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded using the linear combination of the two DFT beams.
  • a non-transitory computer-readable medium having program code recorded thereon.
  • the program code further includes code to perform CSI on a plurality of signals from a serving base station, code to report a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, code to report a second PMI to the serving base station, wherein the second PMI includes first and second parameters that identify a primary beam and a secondary beam from the grid of beams determined from the first PMI, and code to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on one or more of the two DFT beams.
  • a non-transitory computer-readable medium having program code recorded thereon.
  • the program code further includes code to perform CSI measurements on a plurality of signals from a serving base station, code to report a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, code to report a second PMI to the serving base station, wherein the second PMI includes a first parameter that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams, and code to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • an apparatus configured for wireless communication.
  • the apparatus includes at least one processor, and a memory coupled to the processor.
  • the processor is configured to perform CSI measurements on a plurality of signals received from a serving base station, to report a first PMI to the serving base station, wherein the first PMI includes a plurality of wideband parameters that identify two DFT beams for a linear combination, wherein the two DFT beams are selected from a plurality of DFT beams forming the plurality of signals, to report a second PMI to the serving base station, wherein the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams, and to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded using the linear combination of the two DFT beams.
  • an apparatus configured for wireless communication.
  • the apparatus includes at least one processor, and a memory coupled to the processor.
  • the processor is configured to perform CSI on a plurality of signals from a serving base station, to report a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, to report a second PMI to the serving base station, wherein the second PMI includes first and second parameters that identify a primary beam and a secondary beam from the grid of beams determined from the first PMI, and to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on one or more of the two DFT beams.
  • an apparatus configured for wireless communication.
  • the apparatus includes at least one processor, and a memory coupled to the processor.
  • the processor is configured to perform CSI measurements on a plurality of signals from a serving base station, to report a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters, to report a second PMI to the serving base station, wherein the second PMI includes a first parameter that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams, and to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • FIG. 1 is a block diagram illustrating details of a wireless communication system.
  • FIG. 2 is a block diagram conceptually illustrating a design of a base station/eNB and a UE configured according to one aspect of the present disclosure.
  • FIG. 3 is a block diagram illustrating a typical 2D active antenna array.
  • FIG. 4A is a block diagram illustrating an example base station transmitting non-precoded CSI-RS.
  • FIG. 4B is a block diagram illustrating an example base station transmitting beamformed CSI-RS using CSI-RS resources.
  • FIGs. 5A and 5B are block diagrams illustrating beam configurations for a 2D active antenna array of an eNB in communications with a UE.
  • FIG. 6 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure.
  • FIG. 7 is a block diagram illustrating an eNB and a UE configured according to aspects of the present disclosure.
  • FIG. 8 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure.
  • FIG. 9 is a block diagram illustrating an eNB and a UE configured according to one aspect of the present disclosure.
  • FIG. 10 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure.
  • FIG. 11 is a block diagram illustrating a UE configured according to one aspect of the present disclosure.
  • FIG. 12 is a block diagram illustrating an eNB configured according to one aspect of the present disclosure.
  • FIGs. 13A and 13B are block diagrams illustrating an eNB and a UE configured according to various aspects of the present disclosure for providing non-linear combination type codebooks.
  • This disclosure relates generally to providing or participating in authorized shared access between two or more wireless communications systems, also referred to as wireless communications networks.
  • the techniques and apparatus may 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, GSM networks, as well as other communications networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • a CDMA network may implement a radio technology such as universal terrestrial radio access (UTRA) , cdma2000, and the like.
  • UTRA includes wideband-CDMA (W-CDMA) and low chip rate (LCR) .
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • 3GPP defines standards for the GSM EDGE (enhanced data rates for GSM evolution) radio access network (RAN) , also denoted as GERAN.
  • GERAN is the radio component of GSM/EDGE, together with the network that joins the base stations (for example, the Ater and Abis interfaces) and the base station controllers (Ainterfaces, etc. ) .
  • the radio access network represents a component of a GSM network, through which phone calls and packet data are routed from and to the public switched telephone network (PSTN) and Internet to and from subscriber handsets, also known as user terminals or user equipments (UEs) .
  • PSTN public switched telephone network
  • UEs subscriber handsets
  • a mobile phone operator's network may comprise one or more GERANs, which may be coupled with UTRANs in the case of a UMTS/GSM network.
  • An operator network may also include one or more LTE networks, and/or one or more other networks.
  • the various different network types may use different radio access technologies (RATs) and radio access networks (RANs) .
  • RATs radio access technologies
  • RANs radio access networks
  • An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • GSM Global System for Mobile communications
  • LTE long term evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP)
  • cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 3GPP 3rd Generation Partnership Project
  • 3GPP long term evolution LTE
  • UMTS universal mobile telecommunications system
  • the 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices.
  • LTE terminology may be used as illustrative examples in portions of the description below; however, the description is not intended to be limited to LTE applications.
  • the present disclosure is concerned with shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces.
  • LTE/LTE-A when operating in unlicensed spectrum, may leverage LTE concepts and may introduce some modifications to physical layer (PHY) and media access control (MAC) aspects of the network or network devices to provide efficient operation in the unlicensed spectrum and meet regulatory requirements.
  • the unlicensed spectrum used may range from as low as several hundred Megahertz (MHz) to as high as tens of Gigahertz (GHz) , for example.
  • LTE/LTE-A networks may operate with any combination of licensed or unlicensed spectrum depending on loading and availability. Accordingly, it may be apparent to one of skill in the art that the systems, apparatus and methods described herein may be applied to other communications systems and applications.
  • System designs may support various time-frequency reference signals for the downlink and uplink to facilitate beamforming and other functions.
  • a reference signal is a signal generated based on known data and may also be referred to as a pilot, preamble, training signal, sounding signal, and the like.
  • a reference signal may be used by a receiver for various purposes such as channel estimation, coherent demodulation, channel quality measurement, signal strength measurement, and the like.
  • MIMO systems using multiple antennas generally provide for coordination of sending of reference signals between antennas; however, LTE systems do not in general provide for coordination of sending of reference signals from multiple base stations or eNBs.
  • a system may utilize time division duplexing (TDD) .
  • TDD time division duplexing
  • the downlink and uplink share the same frequency spectrum or channel, and downlink and uplink transmissions are sent on the same frequency spectrum.
  • the downlink channel response may thus be correlated with the uplink channel response.
  • Reciprocity may allow a downlink channel to be estimated based on transmissions sent via the uplink.
  • These uplink transmissions may be reference signals or uplink control channels (which may be used as reference symbols after demodulation) .
  • the uplink transmissions may allow for estimation of a space-selective channel via multiple antennas.
  • orthogonal frequency division multiplexing is used for the downlink –that is, from a base station, access point or eNodeB (eNB) to a user terminal or UE.
  • OFDM orthogonal frequency division multiplexing
  • eNB access point
  • UE user terminal
  • OFDM is used in standards such as IEEE 802.11a/g, 802.16, High Performance Radio LAN-2 (HIPERLAN-2, wherein LAN stands for Local Area Network) standardized by the European Telecommunications Standards Institute (ETSI) , Digital Video Broadcasting (DVB) published by the Joint Technical Committee of ETSI, and other standards.
  • IEEE 802.11a/g 802.16, High Performance Radio LAN-2 (HIPERLAN-2, wherein LAN stands for Local Area Network) standardized by the European Telecommunications Standards Institute (ETSI) , Digital Video Broadcasting (DVB) published by the Joint Technical Committee of ETSI, and other standards.
  • ETSI European Telecommunications Standards Institute
  • DVD Digital Video Broadcasting
  • Time frequency physical resource blocks may be defined in OFDM systems as groups of transport carriers (e.g. sub-carriers) or intervals that are assigned to transport data.
  • the RBs are defined over a time and frequency period.
  • Resource blocks are comprised of time-frequency resource elements (also denoted here in as resource elements or “REs” for brevity) , which may be defined by indices of time and frequency in a slot. Additional details of LTE RBs and REs are described in the 3GPP specifications, such as, for example, 3GPP TS 36.211.
  • UMTS LTE supports scalable carrier bandwidths from 20 MHz down to 1.4 MHZ.
  • an RB is defined as 12 sub-carriers when the subcarrier bandwidth is 15 kHz, or 24 sub-carriers when the sub-carrier bandwidth is 7.5 kHz.
  • in the time domain there is a defined radio frame that is 10 ms long and consists of 10 subframes of 1 millisecond (ms) each. Every subframe consists of 2 slots, where each slot is 0.5 ms.
  • the subcarrier spacing in the frequency domain in this case is 15 kHz. Twelve of these subcarriers together (per slot) constitute an RB, so in this implementation one resource block is 180 kHz.
  • Six Resource blocks fit in a carrier of 1.4 MHz and 100 resource blocks fit in a carrier of 20 MHz.
  • an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways.
  • an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein.
  • such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein.
  • a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer.
  • an aspect may comprise at least one element of a claim.
  • FIG. 1 shows a wireless network 100 for communication, which may be an LTE-A network.
  • the wireless network 100 includes a number of evolved node Bs (eNBs) 105 and other network entities.
  • An eNB may be a station that communicates with the UEs and may also be referred to as a base station, a node B, an access point, and the like.
  • Each eNB 105 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to this particular geographic coverage area of an eNB and/or an eNB subsystem serving the coverage area, depending on the context in which the term is used.
  • An eNB may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell, such as a pico cell would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a femto cell, would 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 having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • An eNB for a macro cell may be referred to as a macro eNB.
  • An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB or a home eNB.
  • the eNBs 105a, 105b and 105c are macro eNBs for the macro cells 110a, 110b and 110c, respectively.
  • the eNBs 105x, 105y, and 105z are small cell eNBs, which may include pico or femto eNBs that provide service to small cells 110x, 110y, and 110z, respectively.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells.
  • the wireless network 100 may support synchronous or asynchronous operation.
  • the eNBs may have similar frame timing, and transmissions from different eNBs may be approximately aligned in time.
  • the eNBs may have different frame timing, and transmissions from different eNBs may not be aligned in time.
  • the UEs 115 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • a UE may 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, or the like.
  • PDA personal digital assistant
  • a UE may be able to communicate with macro eNBs, pico eNBs, femto eNBs, relays, and the like.
  • a lightning bolt (e.g., communication links 125) indicates wireless transmissions between a UE and a serving eNB, which is an eNB designated to serve the UE on the downlink and/or uplink, or desired transmission between eNBs.
  • Wired backhaul communication 134 indicate wired backhaul communications that may occur between eNBs.
  • LTE/-A utilizes orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (X) orthogonal subcarriers, which are also commonly referred to as tones, bins, or the like.
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (X) may be dependent on the system bandwidth.
  • X may be equal to 72, 180, 300, 600, 900, and 1200 for a corresponding system bandwidth of 1.4, 3, 5, 10, 15, or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into sub-bands.
  • a sub-band may cover 1.08 MHz, and there may be 1, 2, 4, 8 or 16 sub-bands for a corresponding system bandwidth of 1.4, 3, 5, 10, 15, or 20MHz, respectively.
  • FIG. 2 shows a block diagram of a design of a base station/eNB 105 and a UE 115, which may be one of the base stations/eNBs and one of the UEs in FIG. 1.
  • the eNB 105 may be the small cell eNB 105z in FIG. 1
  • the UE 115 may be the UE 115z, which in order to access small cell eNB 105z, would be included in a list of accessible UEs for small cell eNB 105z.
  • the eNB 105 may also be a base station of some other type.
  • the eNB 105 may be equipped with antennas 234a through 234t, and the UE 115 may be equipped with antennas 252a through 252r.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the PBCH, PCFICH, PHICH, PDCCH, etc.
  • the data may be for the PDSCH, etc.
  • the transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal.
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a through 232t.
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a through 232t may be transmitted via the antennas 234a through 234t, respectively.
  • the antennas 252a through 252r may receive the downlink signals from the eNB 105 and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source 262 and control information (e.g., for the PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal.
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc. ) , and transmitted to the eNB 105.
  • the uplink signals from the UE 115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115.
  • the processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the controllers/processors 240 and 280 may direct the operation at the eNB 105 and the UE 115, respectively.
  • the controller/processor 240 and/or other processors and modules at the eNB 105 may perform or direct the execution of various processes for the techniques described herein.
  • the controllers/processor 280 and/or other processors and modules at the UE 115 may also perform or direct the execution of the functional blocks illustrated in FIGs. 6, 8, and 10, and/or other processes for the techniques described herein.
  • the memories 242 and 282 may store data and program codes for the eNB 105 and the UE 115, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • MIMO Multiple-input multiple-output
  • An eNB may broadcast cell-specific CSI reference signals (CSI-RS) for which the UE measures CSI based on configurations signaled by eNB via RRC, such as CSI-RS resource configuration and transmission mode.
  • the CSI-RS are periodically transmitted at periodicities of 5, 10, 20, 40, 80 ms, or the like.
  • a UE may report CSI at CSI reporting instances also configured by the eNB.
  • the UE As a part of CSI reporting the UE generates and reports channel quality indicator (CQI) , precoding matrix indicator (PMI) , and rank indicator (RI) .
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indicator
  • the CSI can be reported either via PUCCH or via PUSCH and may be reported either periodically or aperiodically, with potentially different granularity.
  • the payload size for CSI may be limited.
  • FD-MIMO full-dimensional
  • an eNB uses a two-dimensional (2D) active antenna array with a large number of antennas with antenna ports having both horizontal and vertical axes, and has a larger number of transceiver units.
  • 2D two-dimensional
  • beamforming has typically implemented using only azimuth dimension, although of a 3D multi-path propagation.
  • each transceiver unit has its own independent amplitude and phase control.
  • Such capability together with the 2D active antenna array allows the transmitted signal to be steered not only in the horizontal direction, as in conventional multi-antenna systems, but also simultaneously in both the horizontal and the vertical direction, which provides more flexibility in shaping beam directions from an eNB to a UE.
  • Providing dynamic beam steering in the vertical direction has been shown to result in significant gain in interference avoidance.
  • FD-MIMO technologies may take advantage of both azimuth and elevation beamforming, which would greatly improve MIMO system capacity and signal quality.
  • FIG. 3 is a block diagram illustrating a typical 2D active antenna array 30.
  • the CSI in terms of PMI, RI, and CQI, can be fed back to the base station by a mobile station based on downlink channel estimation and predefined PMI codebook (s) .
  • PMI codebook predefined PMI codebook
  • a CSI process may be configured with either of two CSI reporting classes, class A non-precoded or class B beamformed.
  • FIG. 4A is a block diagram illustrating an example base station 400 transmitting non-precoded CSI-RS 401.
  • class A non-precoded reporting one non-zero power (NZP) CSI-RS resource per CSI process may be used for channel measurement in which the number of CSI-RS ports may be 8, 12, or 16.
  • Interference measurement in class A reporting may include one CSI-interference measurement (IM) resource per CSI process.
  • NZP non-zero power
  • IM CSI-interference measurement
  • Base station 400 serves UEs 403 and 404 and UEs 405 and 406 in structure 40.2D CSI-RS ports transmit non-precoded CSI-RS 401 and PDSCH 402 to UEs 403-406.
  • UEs 403-406 measure the non-precoded CSI-RS and reports CQI, precoding matrix indicator (PMI) (2D codebook) , and rank indicator to base station 400.
  • PMI precoding matrix indicator
  • FIG. 4B is a block diagram illustrating an example base station 407 transmitting beamformed CSI-RS using CSI-RS resources 408-410.
  • CSI-RS resources 408-410 may be directed to serve different UE groups, such as UE group 415, including UEs 411 and 412, and UE group 416, including UEs 413 and 414 in structure 41. Because different CSI-RS resources are used for different UE groups, when providing CSI feedback, UEs 411-414 report CQI, PMI (1D codebook) , rank indicator, as well as the CSI-RS resource indicator (CRI) , if K > 1, which identifies to base station 407 which of the CSI-RS resources the UE has measured and provided channel state information (CSI) feedback for.
  • CQI CQI
  • PMI (1D codebook
  • rank indicator rank indicator
  • CRI CSI-RS resource indicator
  • each CSI process may be associated with K NZP CSI-RS resources/configurations, with N k ports for the k th CSI-RS resource (K could be ⁇ 1) , in which N k may be 1, 2, 4, or 8, and may be different for each CSI-RS resource.
  • K could be ⁇ 1
  • N k may be 1, 2, 4, or 8
  • Each CSI-RS resource may also have different CSI-RS port virtualization, e.g., virtualized from different sets of antenna elements or from the same set of antenna elements but with different beamforming weights.
  • Multiple CSI-IM per CSI process is also possible, with one-to-one linkage to each NZP CSI-RS resource.
  • the class A rank 1-2 codebook is generally a dual codebook defined as:
  • the precoder W is a composite of W 1 , which includes a grid of beams (e.g., a Kronecker product of discrete Fourier transform (DFT) beams of each dimension) indicated by parameters from a first antenna dimension, i 11 and i 12 , and determined by the RRC parameters of N 1 , N 2 , O 1 , O 2 (the number ports and oversampling rates per dimension) and also the particular configuration of the grid, and W 2 , which provides the beam selection within the grid of beams along with the polarization co-phase indicated by a parameter from a second antenna dimension, i 2 .
  • a grid of beams e.g., a Kronecker product of discrete Fourier transform (DFT) beams of each dimension
  • N 1 , N 2 , O 1 , O 2 the number ports and oversampling rates per dimension
  • W 2 which provides the beam selection within the grid of beams along with the polarization co-phase indicated by a parameter from a second antenna dimension,
  • FIGs. 5A and 5B are block diagrams illustrating beam configurations for a 2D active antenna array of eNB 105 in communications with UE 115.
  • the W 1 codebook allows for a selection of a grid of beams 500 out of the collection of beams 50.
  • W 1 constructs the grid of beams according to:
  • X 1 is an N 1 x L 1 matrix with L 1 column vectors being an O 1 times oversampled DFT vector of length N 1
  • X 2 is an N 2 x L 2 matrix with L 2 column vectors being an O 2 times oversampled DFT vector of length N 2
  • PMI precoding matrix indicator
  • Grid of beams 500 includes the Kronecker product of DFT beams of each dimension indicated by parameters, i 11 and i 12 .
  • a predetermined CSI reporting mode configuration, CSI reporting configurations 501 will identify the particular beams within grid of beams 500 from which beam selection will occur.
  • the W 2 codebook, along with one of CSI reporting configurations 501, defines the beam selection within grid of beams 500 along with the polarization co-phase, indicated by i 2 .
  • CSI reporting configurations 501 include configuration 1 through configuration 4 for selection of various dimensions of beams in orthogonal and non-orthogonal orientations.
  • Configuration 1 of CSI reporting configurations 501 provides for only a single beam from which to perform beam selection from grid of beams 500.
  • Configuration 2 provides four beams with a beam offset, p, of 1 for each beam.
  • Configuration 3 provides orthogonal selections for beams when the number of antenna ports of one antenna dimension is greater than or equal to the number of antenna ports in the other antenna dimension (N 1 ⁇ N 2 ) .
  • Configuration 4 provide non-orthogonal selections for beams when N 1 ⁇ N 2 .
  • High resolution CSI feedback is a potential area of enhancement to MIMO technologies in new and future 3GPP releases that may improve the viability of massive MIMO and FD-MIMO.
  • the Rel. 13 codebook is defined by a single DFT (or KP-DFT) beam.
  • KP-DFT KP-DFT
  • a linear combination codebook based on weighted DFT beams corresponding to multi-paths may capture more channel information.
  • the performance of MU-MIMO is expected to benefit more from linear combined codebooks considering the additional information on the multiple paths may be used to calculate multi-user precoders to avoid large intra-cell interference (e.g., transmit nulling gain) .
  • One such example solution for higher resolution CSI feedback provides for a linear combination codebook that uses a linear combination of a set of four adjacent DFT basis vectors or beams with corresponding sets of cross-polarization co-phase and complex coefficient values selected from respective co-phase and coefficient codebooks.
  • QPSK quadrature phase shift keying
  • Various aspects of the present disclosure are directed to a linear combination codebook using a composite precoder represented by a linear combination of two DFT precoding vectors.
  • the composite precoder is represented by the following equations:
  • p represents the composite precoder
  • b 1 and b 2 are the selected DFT vectors for combination
  • ⁇ 1 and ⁇ 2 are the co-phasing angles
  • c is the complex coefficient.
  • the composite precoder for the linear combination of two DFT vectors provides a higher resolution CSI feedback for FD-MIMO systems while maintaining a more manageable computational complexity and CSI overhead.
  • a first option with wideband beam pair selection precoders from the W 1 codebook allows for identification of two DFT beams, which may or may not be orthogonal or non-orthogonal to each other.
  • a new W 1 /W 2 codebook may be used.
  • the second option includes a widebank primary beam selection, in which the legacy W 1 codebook may be reused to define the grid of beams along with a new W 2 codebook design for beam selection.
  • FIG. 6 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIG. 11.
  • FIG. 11 is a block diagram illustrating UE 115 configured according to one aspect of the present disclosure.
  • UE 115 includes the structure, hardware, and components as illustrated for UE 115 of FIG. 2.
  • UE 115 includes controller/processor 280, which operates to execute logic or computer instructions stored in memory 282, as well as controlling the components of UE 115 that provide the features and functionality of UE 115.
  • UE 115 under control of controller/processor 280, transmits and receives signals via wireless radios 1100a-t and antennas 252a-r.
  • Wireless radios 1100a-t includes various components and hardware, as illustrated in FIG. 2 for eNB 105, including modulator/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.
  • a UE performs channel quality measurements on a plurality of signals received from a serving base station.
  • the UE such as UE 115, performs measurements and makes estimates of signals received from a serving base station in order to provide various CSI feedback on the channel quality.
  • UE 115 under control of controller/processor 280, executes measurement logic 1101, stored in memory 282, to measure the various signals received from the base station.
  • the signals received may be data signals or control signals, such as CSI-RS.
  • UE 115 performs such measurements and estimates to obtain information on the state of the communication channel between itself and the serving base station.
  • the UE reports a first precoding matrix indicator (PMI) to the serving base station, wherein the first PMI includes a plurality of wideband parameters that identify two DFT beams for a linear combination, wherein the two DFT beams are selected from a plurality of DFT beams forming the plurality of signals.
  • PMI precoding matrix indicator
  • UE 115 under control of controller/processor 280, executes CSI report generator 1102, which generates the first PMI report.
  • UE 115 reports a first PMI associated with W 1 that may include, as determined by the execution environment of CSI report generator 1102, wideband i 11 , i 12 , k 1 , and k 2 , where the value range of i 11 and i 12 may be dependent on the configured N 1 , N 2 , O 1 , O 2 .
  • the first PMI will be reported via wireless radios 1100a-r and antennas 252a-r.
  • joint coding of i 11 , i 12 , k 1 , and k 2 may be supported in the W 1 associated PMI reported by UE 115.
  • the UE reports a second PMI to the serving base station, wherein the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams.
  • the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams.
  • UE 115 under control of controller/processor 280 executing CSI report generator 1102, reports a second PMI associated with W 2 that may include a 6-bit i 2 , either wideband or subband, based on predetermined CSI reporting configuration 1103, stored in memory 282.
  • the additional CSI feedback (e.g., CQI and RI) may be provided by UE 115 via wireless radios 1100a-r and antennas 252a-4, according to the same procedures as in the legacy Rel. 13 CSI feedback.
  • the UE receives precoded or beamformed transmissions from the serving base station via antennas 252a-r and wireless radios 1100a-r, wherein the precoded or beamformed transmissions are precoded based on a channel estimation using the linear combination of the two DFT beams.
  • the purpose of CSI feedback is for the base station to adjust its transmissions to a UE in order to increase the efficiency and reliability of the communications. As the serving base station receives the CSI feedback, it may adjust the precoding selections and transmission parameters to accommodate the existing channel conditions.
  • the orientational relationship between the two DFT beam may be identified and signaled with an identifier, k 1 .
  • the W 1 codebook of the first option identifies the two DFT beams according to:
  • the W 2 codebook identifies the complex coefficient weighting, c, and co-phasing, ⁇ 1 and ⁇ 2 , according to:
  • a set of DFT beams is determined based on the predetermined CSI reporting configuration and the parameters i 11 , i 12 , k 1 , which a base station would receive as a first PMI related to W 1 .
  • FIG. 7 is a block diagram illustrating eNB 105 and UE 115 configured according to aspects of the present disclosure.
  • eNB 105 and UE 115 are configured with an enhanced linear combination codebook for high resolution feedback according to a first optional aspect.
  • UE 115 transmits a first PMI associated with W1 to eNB 105.
  • the first PMI sent by UE 115 includes i 11 , i 12 , k 1 .
  • a predetermined CSI reporting configuration would be set and known to both eNB 105 and UE 115.
  • eNB 105 identifies a grid of beams from the collection of DFT beams associated with the 2D antenna array at eNB 105.
  • i 11 and i 12 assist in defining the grid of beams, while the predetermined CSI reporting configuration defines which of the beams within the defined grid of beams the DFT beam pair, b 1 and b 2 , will be selected from.
  • b 1 will be selected from beam 0 of grid of beams 700
  • b 2 will be selected from beam 1 of grid of beams 701.
  • b 1 will be selected from beams 0-3 of grid of beams 702
  • b 2 will be selected from beams 4-7 of grid of beams 703.
  • configurations 3 and 4 are selected from the numbered beams of grid of beams 704-707, respectively.
  • a linear combination of the DFT beam pair may be used to adjust transmissions from eNB 105 to UE 115.
  • two beams would be selected from the set of DFT beams according to a predefined beam pair combination set indicated by the parameters k 1 and k 2 , where k 2 is a parameter used to select one of the defined beam pairs from the set of beam pairs indicated by k 1 .
  • Table 1 below identifies the beam offset for a selected beam pair according to the value of parameters k 1 and k 2 .
  • ( ⁇ 1 , ⁇ 2 ) indicates the beam offset of selected beam pair (b 1 , b 2 ) in the set of DFT beams indicated by (i 11 , i 12 , k 1 ) of the W 1 codebook according to the aspects described herein with the first option.
  • Table 2 below is just one example of a W 1 codebook for a predetermined CSI reporting mode configuration of configuration 3.
  • the selected beam pair (b 1 , b 2 ) are jointly determined by i 11 , i 12 , k 1 , and k 2 , where l 1 , and m 1 are the associated beam index for the primary beam, b 1 .
  • Table 2 is only one example of a W 1 codebook and is only an example for a codebook where the predetermined CSI reporting configuration is set to configuration 3.
  • the codebook parameters (s 1 , s 2 ) and (p 1 , p 2 ) can be the same as the legacy non-linear combination codebook, for example, where (s 1 , s 2 ) indicates beam group spacing and (p 1 , p 2 ) indicates beam offset.
  • Table 3 below reflects an example beam group spacing and beam offsets for W 1 codebooks of CSI reporting configurations according to various aspects of the present disclosure.
  • the PMI feedback may be subsampled.
  • UE 115 under control of controller/processor 280, executes codebook subsampler 1104, stored in memory 282.
  • the oversampling factor may be reduced on each dimension to fit within an i 1 limit.
  • the beam selection hypotheses may be reduced by UE 115.
  • UE 115 may subsample the W 2 by fixing the co-phase to [0, ⁇ ] , for example, by changing from QPSK to BPSK, or reducing the complex coefficient.
  • FIG. 8 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIG. 11.
  • a UE performs channel quality measurements on a plurality of signals from a serving base station.
  • the UE such as UE 115, under control of controller/processor 280, executes measurement logic 1101, stored in memory 282, to measure the various signals received from the base station.
  • UE 115 performs the measurements and makes estimates of signals, such as CSI-RS, received from a serving base station in order to provide various CSI feedback on the channel quality.
  • the UE reports a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters of a first antenna dimension.
  • PMI feedback from the UE such as UE 115, is associated with both precoders W 1 and W 2 .
  • UE 115 under control of controller/processor 280, executes CSI report generator 1102, which generates the first PMI report and transmits the PMI via wireless radios 1100a-r and antennas 252a-r.
  • W 1 wideband i 11, i 12
  • the value range of i 11 and i 12 may be dependent on the configured N 1 , N 2 , O 1 , O 2 .
  • the UE reports a second PMI to the serving base station, wherein the second PMI includes first and second parameters of a second antenna dimension that identify a primary beam and a secondary beam from the grid of beams determined from the first PMI.
  • the CQI and RI feedback from UE 115 will be the same as legacy feedback.
  • the UE receives precoded or beamformed transmissions from the serving base station via antennas 252a-r and wireless radios 1100a-r, wherein the precoded or beamformed transmissions are precoded based on one or more of the two DFT beams.
  • the purpose of CSI feedback is for the base station to adjust its transmissions to UE 115 in order to increase the efficiency and reliability of the communications. As the serving base station receives the CSI feedback, transmissions are adjusted to accommodate the existing channel conditions.
  • a wideband primary beam selection is used in which the legacy W 1 codebook may be reused along with a new W 2 codebook design.
  • the primary beam indicated by (i 11 , i 12 , i 21 ) may be wideband selected.
  • the first precoder, W 1 may be represented according to the following equation:
  • the secondary beam, and also the complex weighting indicated by (i 11 , i 12 , i 21 ) may be selected in either widebeam or subband based on the predetermined CSI reporting mode configuration.
  • the second precoder, W 2 may be represented according to the following equation:
  • Both the primary and secondary beams use the same W 1 precoding matrix indicated by (i 11 , i 12 ) and may also reuse the legacy W 1 codebook.
  • FIG. 9 is a block diagram illustrating eNB 105 and UE 115 configured according to one aspect of the present disclosure.
  • UE 115 transmits a first PMI associated with W 1 including i 11 , i 12 to eNB 105.
  • eNB 105 uses i 11 , i 12 to identify grid of beams 900a within the beams of the antenna array of eNB 105.
  • the beams from which the primary and secondary beams will be selected are indicated at beams 0-3 of grid of beams 900a.
  • the second PMI feedback from UE 115 of i 2 includes i 21 for the beam selection and co-phasing of the first primary beam, and i 22 for the beam selection, co-phasing and coefficient of the second beam, which may be either dependent or independent of i 21 .
  • eNB 105 identifies secondary beam 902 out of beams 1-2 of grid of beams 900b using i 22 and identifies primary beam 902 from beam 3 of grid of beams 900b using i 21 . It should be noted that when i 22 is dependent on i 21 , different beams may be selected for the first and second beams.
  • the composite precoder, p may be determined according to equation (1) :
  • the second option includes a joint W 2 codebook designed for instances in which different beams are used for the linear combination.
  • the W 2 codebook may be based on beam selection and polarization co-phasing, thus, falling back to a non-linear combination codebook with 16 codewords with beam selection and co-phasing.
  • the W 2 codebook may be based on a linear combination of a primary beam indicated by i 21 and a secondary beam indicated by i 22 .
  • the 16 codewords of the legacy non-linear combination codebook and the 48 codewords of the linear combination codebook combine into the joint W 2 codebook of 64 codewords.
  • index (l, m) and co-phasing ⁇ are only determined by i 11 and i 12 , irrespective of i 22 .
  • Table 4 is only one example of a W 1 codebook for the second option of the present disclosure and is only an example for a codebook where the predetermined CSI reporting configuration is set to configuration 3.
  • Table 5 is only one example of a codebook for the second option of the present disclosure and is only an example for a codebook where the predetermined CSI reporting configuration is set to configuration 3.
  • subsampling of certain PMI may be performed in order to fit PUCCH overhead.
  • UE 115 under control of controller/processor 280, executes codebook subsampler 1104, stored in memory 282.
  • codebook subsampler 1104 when the PMI feedback is i 11 , the oversampling factor may be reduced on each dimension to fit within an i 1 limit.
  • the PMI feedback is i 21 or i 22
  • either the beam selection hypotheses may be reduced or the co-phase may be reduced by UE 115, such as by changing from QPSK to BPSK.
  • UE 115 may fix i 21 at 0 and, thus, not reported, while UE 115 may fall back to the legacy non-linear combination codebook, with the fall back feedback and restriction of i 22 ⁇ 16.
  • FIG. 10 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIG. 11.
  • a UE performs channel quality measurements on a plurality of signals from a serving base station.
  • the UE such as UE 115, under control of controller/processor 280, executes measurement logic 1101, stored in memory 282, to measure the various signals received from the base station in order to provide various CSI feedback on the channel quality.
  • the UE reports a first PMI to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of DFT beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters of a first antenna dimension.
  • the subband beam pair selection may also reuse the legacy W 1 codebook along with a new W 2 codebook design.
  • the first PMI (i 11, i 12 ) associated with W 1 and transmitted by the UE, such as UE 115, may determine a set of four DFT beams according to the codebook set parameter of selected CSI reporting configuration 1103, stored in memory 282.
  • UE 115 under control of controller/processor 280, executes CSI report generator 1102, which generates the first PMI report with the four DFT beams and transmits the PMI via wireless radios 1100a-r and antennas 252a-r.
  • the UE reports a second PMI to the serving base station, wherein the second PMI includes a first parameter of a second antenna dimension that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams.
  • the second PMI includes a first parameter of a second antenna dimension that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams.
  • the second PMI associated with W 2 and transmitted by UE 115 via wireless radios 1100a-r and antennas 252a-r, under control of controller/processor 280 executing CSI report generator 1102, may be a 6-bit i 2 which performs beam pair selection, weighting, and co-phasing, using a common co-phase.
  • the CQI and RI feedback are the same as in the legacy feedback.
  • the composite precoder, p, for the third option may be determined according to the following equation:
  • the UE receives precoded or beamformed transmissions from the serving base station via antennas 252a-r and wireless radios 1100a-r, wherein the precoded or beamformed transmissions are precoded based on a linear combination of the two DFT beams.
  • the purpose of CSI feedback is for the base station to adjust its transmissions to UE 115 in order to increase the efficiency and reliability of the communications. As the serving base station receives the CSI feedback, transmissions are adjusted to accommodate the existing channel conditions.
  • Table 6 below is an example codebook for the configuration 4 of the third option of subband beam pair selection.
  • (l 1 , m 1 ) and (l 2 , m 2 ) are the associated beam indices for the selected beam pair (b 1 , b 2 ) , where c ⁇ [1, -1, j, -j] and are based on i 2 .
  • Table 6 is only one example of a codebook for the third option of the present disclosure and is only an example for a codebook where the predetermined CSI reporting configuration is set to configuration 4.
  • wideband i 11 , i 12 are fed back by UE 115, where the value range of i 11 and i 12 may be dependent on the configured N 1 , N 2 , O 1 , O 2 .
  • a 6-bit i 12 which may be either wideband or subband based on configured reporting mode, is fed back by UE 115.
  • UE 115 may subsample certain PMI in order to fit within the available PUCCH CSI overhead. For example, UE 115, under control of controller/processor 280, executes codebook subsampler 1104, stored in memory 282. Within the execution environment of codebook subsampler 1104, when the PMI feedback is i 11 and i 12, the oversampling factor may be reduced on each dimension to fit within an i 1 limit. When the PMI feedback is i 2 , either the beam selection hypotheses may be reduced by UE 115, for example from 4 to 2, or the co-phase may be reduced, such as by changing from QPSK to BPSK.
  • the linear combination codebook may be intended for multi-user MIMO (MU-MIMO) precoder calculation (transmitter side nulling)
  • MU-MIMO multi-user MIMO
  • transmit side nulling transmitter side nulling
  • the eNB may fall back to the Rel. 13 class A high rank codebook if needed.
  • UE 115 under control of controller/processor 280, executes codebook subsampler 1104, stored in memory 282.
  • codebook subsampler 1104 executes codebook subsampler 1104, stored in memory 282.
  • N p is the number of antenna ports for BF CSI-RS.
  • the determination of beam index (l 1 , m 1 ) and (l 2 , m 2 ) is the same as the codebook table for configuration 4 for the non-precoded CSI-RS.
  • the options for the first and second PMI are provided in the following table 7.
  • FIG. 12 is a block diagram illustrating eNB 105 configured according to one aspect of the present disclosure.
  • eNB 105 includes the structure, hardware, and components as illustrated for eNB 105 of FIG. 2.
  • eNB 105 includes controller/processor 240, which operates to execute logic or computer instructions stored in memory 242, as well as controlling the components of eNB 105 that provide the features and functionality of eNB 105.
  • eNB 105 under control of controller/processor 240, transmits and receives signals via wireless radios 1200a-t and antennas 234a-t.
  • Wireless radios 1200a-t includes various components and hardware, as illustrated in FIG. 2 for eNB 105, including modulator/demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230.
  • eNB 105 may receive CSI feedback from a served UE via antennas 234a-t and wireless radios 1200a-t. eNB 105 stores the received feedback at CSI feedback 1201 in memory 242. As the higher layers determine to change the predetermined CSI reporting mode configuration, the network would signal both eNB 105 and UE 115. eNB 105 stores the configuration at CSI reporting configuration 1202 in memory 242. After receiving a first PMI from a UE, eNB 105 executes beam configuration 1203, under control of controller/processor 242, to form the grid of beams based on the dimension parameters included in the first PMI.
  • either a PMI of i 11 and i 12 may be used with the collection of beams to form a grid of beams from which the DFT beams for combination may be selected.
  • eNB 105 under control of controller/processor 240, executes beam configuration 1203, stored in memory 242, to form the grid of beams with the fed back i 11 and i 12, and in consideration of the CSI reporting configuration 1202.
  • the second and third options reuse the legacy W 1 codebook with to create the grid of beams.
  • i 11 and i 12 is used in addition to k 1 and the CSI reporting configuration 1202 to specifically select the two DFT beams for the linear combination.
  • eNB 105 under control of controller/processor 240, executes CSI-RS generator to generate a CSI-RS using the high resolution CSI received from the UE via antennas 234a-t and wireless radios 1200a-t.
  • eNB 105 under control of controller/processor 240 operates the linear combination feedback and adjusts the transmission characteristics of the CSI-RS according to the feedback before transmitting via mobile radios 1200a-t and antennas 234a-t.
  • FIGs. 13A and 13B are block diagrams illustrating eNB 105 and UE 115 configured according to various aspects of the present disclosure for providing non-linear combination type codebooks.
  • a first non-linear combination codebook option as illustrated in FIG. 13A, UE 115 transmits a first PMI associated with W 1 to eNB 105, the first PMI includes i 11 , i 12 , k, where i 11 , i 12 defines the index of the grid of beams, k defines the beam offset within the grid of beams (p 1 , p 2 ) .
  • i 11 , i 12 , and k are wideband feedback.
  • the codebook parameters (s 1 , s 2 ) and (p 1 , p 2 ) can be the same as the legacy codebook, for example, where (s 1 , s 2 ) indicates beam group spacing and (p 1 , p 2 ) indicates beam offset.
  • Grid of beam size (L 1 , L 2 ) and k jointly determine the value of (p 1 , p 2 ) as illustrated in configurations 1300-1303.
  • Table 8 below shows an example beam group spacings and beam offsets for W 1 codebooks of codebook configurations according to various aspects of the present disclosure.
  • UE 115 transmits a first PMI associated with W 1 to eNB 105, the first PMI includes i 11 , i 12 , where i 11 , i 12 defines the index of the grid of beams the beam selected from the grid of beams is dependent on the particular configuration, as illustrated in configurations 1304-1305.
  • i 11 , i 12 defines the index of the grid of beams the beam selected from the grid of beams is dependent on the particular configuration, as illustrated in configurations 1304-1305.
  • Config 6 1305, beams with index of (0, 1, 2, 3) are selected.
  • (s 1 , s 2 ) (2, 2)
  • the present disclosure comprises a first aspect, such as a non-transitory computer-readable medium having program code recorded thereon, the program code comprising:
  • program code for causing a computer to perform channel state information (CSI) measurements on a plurality of signals received from a serving base station;
  • CSI channel state information
  • program code for causing the computer to report a first precoding matrix indicator (PMI) to the serving base station, wherein the first PMI includes a plurality of wideband parameters that identify two discrete Fourier transform (DFT) beams for a linear combination, wherein the two DFT beams are selected from a plurality of DFT beams forming the plurality of signals;
  • PMI precoding matrix indicator
  • program code for causing the computer to report a second PMI to the serving base station, wherein the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams;
  • program code for causing the computer to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded using the linear combination of the two DFT beams.
  • the non-transitory computer-readable medium of a second aspect wherein the plurality of wideband parameters are jointly coded in the first PMI.
  • the non-transitory computer-readable medium of a third aspect wherein the plurality of wideband parameters of the first PMI includes wideband parameters identifying one of: two non-orthogonal beams, two orthogonal beams on a first antenna dimension, and two orthogonal beams on a second antenna dimension.
  • the non-transitory computer-readable medium of a fourth aspect wherein the plurality of wideband parameters of the first PMI are dependent on a number of ports in first and second dimensions of an antenna array and an oversampling rate per first and second dimensions.
  • non-transitory computer-readable medium of a fifth aspect further including:
  • program code for causing the computer to detect feedback overhead exceeding an overhead limit on physical uplink control channel (PUCCH) ;
  • PUCCH physical uplink control channel
  • program code executable in response to the feedback overhead exceeding the overhead limit, one of:
  • the non-transitory computer-readable medium of a sixth wherein the precoded transmissions are precoded using the linear combination in response to a rank being less than 3, and wherein the precoded transmissions are precoded using a non-linear combination beam selection of one of the two DFT beams in response to the rank being greater than or equal to 3.
  • the non-transitory computer-readable medium of a seventh wherein the plurality of signals are a plurality of beamformed channel state information (CSI) reference signals (CSI-RS) , and wherein the plurality of wideband parameters of the first PMI include wideband beam pair combination parameters.
  • CSI channel state information
  • CSI-RS beamformed channel state information reference signals
  • the present disclosure comprises a ninth aspect, such as a non-transitory computer-readable medium having program code recorded thereon, the program code comprising:
  • program code for causing a computer to perform channel state information (CSI) on a plurality of signals from a serving base station;
  • CSI channel state information
  • program code for causing the computer to report a first precoding matrix indicator (PMI) to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of discrete Fourier transform (DFT) beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters;
  • PMI precoding matrix indicator
  • DFT discrete Fourier transform
  • program code for causing the computer to report a second PMI to the serving base station, wherein the second PMI includes first and second parameters that identify a primary beam and a secondary beam from the grid of beams determined from the first PMI;
  • program code for causing the computer to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on one or more of the two DFT beams.
  • the non-transitory computer-readable medium of a tenth aspect wherein the first and second parameters of the second PMI are one of: wideband or subband, based on a predetermined CSI reporting mode configuration, wherein the first parameter identifies beam selection and co-phasing of the primary beam, and wherein the second parameter identifies beam selection, co-phasing, and complex coefficient of the secondary beam.
  • the non-transitory computer-readable medium of an eleventh wherein the plurality of wideband parameters of the first PMI are dependent on a number of ports in first and second dimensions of an antenna array and an oversampling rate per first and second dimensions.
  • the non-transitory computer-readable medium of a twelfth wherein the second parameter is one of: independent from or dependent on the first parameter.
  • the non-transitory computer-readable medium of a thirteenth aspect wherein the second parameter is dependent on the first parameter, wherein the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • the non-transitory computer-readable medium of a fourteenth aspect wherein the second parameter is independent of the first parameter, wherein the precoded transmissions are precoded based on a non-linear combination beam selection of one of the two DFT beams.
  • the non-transitory computer-readable medium of fifteenth wherein the precoded transmissions are precoded based on the non-linear combination beam selection of one of the two DFT beams when the second parameter is below a predefined threshold, and wherein the precoded transmissions are precoded based on the linear combination when the second parameter is greater than or equal to the predefined threshold.
  • non-transitory computer-readable medium of a sixteenth aspect further including:
  • program code for causing the computer to detect feedback overhead exceeding an overhead limit on physical uplink control channel (PUCCH) ;
  • PUCCH physical uplink control channel
  • program code executable in response to the feedback overhead exceeding the overhead limit, one of:
  • the non-transitory computer-readable medium of a seventeenth aspect wherein the precoded transmissions are precoded using the linear combination in response to a rank being less than 3, and wherein the precoded transmissions are precoded using a non-linear combination beam selection of one of the two DFT beams in response to the rank being greater than or equal to 3.
  • the non-transitory computer-readable medium of an eighteenth aspect wherein the plurality of signals are a plurality of beamformed channel state information (CSI) reference signals (CSI-RS) , and wherein the second PMI includes a wideband first parameter that identifies beam selection and co-phasing of the primary beam and the second parameter that identifies beam selection, co-phasing, and complex coefficient of the secondary beam.
  • CSI channel state information
  • a nineteenth aspect of the present disclosure includes a non-transitory computer-readable medium of any combination of the ninth through eighteenth aspects.
  • the present disclosure comprises a twentieth aspect, such as a non-transitory computer-readable medium having program code recorded thereon, the program code comprising:
  • program code for causing a computer to perform channel state information (CSI) measurements on a plurality of signals from a serving base station;
  • CSI channel state information
  • program code for causing the computer to report a first precoding matrix indicator (PMI) to the serving base station, wherein the first PMI is selected from a legacy codebook to determine a grid of beams as a subset of a plurality of discrete Fourier transform (DFT) beams forming the plurality of signals, wherein the determination is based on a plurality of wideband parameters;
  • PMI precoding matrix indicator
  • DFT discrete Fourier transform
  • program code for causing the computer to report a second PMI to the serving base station, wherein the second PMI includes a first parameter that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams;
  • program code for causing the computer to receive precoded transmissions from the serving base station, wherein the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • the non-transitory computer-readable medium of a twenty-first aspect wherein the plurality of wideband parameters of the first PMI are dependent on a number of ports in first and second dimensions of an antenna array and an oversampling rate per first and second dimensions.
  • the non-transitory computer-readable medium of a twenty-second aspect wherein the second PMI is one of: wideband or subband, based on a predetermined CSI reporting mode configuration.
  • non-transitory computer-readable medium of a twenty-third aspect further including:
  • program code for causing the computer to detect feedback overhead exceeding an overhead limit on physical uplink control channel (PUCCH) ;
  • PUCCH physical uplink control channel
  • program code executable in response to the feedback overhead exceeding the overhead limit, one of:
  • the non-transitory computer-readable medium of a twenty-fourth aspect wherein the precoded transmissions are precoded using the linear combination in response to a rank being less than 3, and wherein the precoded transmissions are precoded using a non-linear combination beam selection of one of the two DFT beams in response to the rank being greater than or equal to 3.
  • the non-transitory computer-readable medium of a twenty-fifth aspect wherein the plurality of signals are a plurality of beamformed channel state information (CSI) reference signals (CSI-RS) , and wherein the first PMI is not reported.
  • CSI channel state information
  • a twenty-sixth aspect of the non-transitory computer-readable medium includes any combination of the twentieth through twenty-fifth aspects.
  • the present disclosure comprises a twenty-seventh aspect, such as an apparatus configured for wireless communication, the apparatus comprising:
  • the at least one processor is configured:
  • CSI channel state information
  • the serving base station to report a first precoding matrix indicator (PMI) to the serving base station, wherein the first PMI includes a plurality of wideband parameters that identify two discrete Fourier transform (DFT) beams for a linear combination, wherein the two DFT beams are selected from a plurality of DFT beams forming the plurality of signals;
  • PMI precoding matrix indicator
  • the second PMI includes a complex coefficient weighting and co-phasing for the linear combination of the identified two DFT beams
  • precoded transmissions are precoded using the linear combination of the two DFT beams.
  • the apparatus of a twenty-eighth aspect wherein the plurality of wideband parameters are jointly coded in the first PMI.
  • the apparatus of a twenty-ninth aspect wherein the plurality of wideband parameters of the first PMI includes wideband parameters identifying one of: two non-orthogonal beams, two orthogonal beams on a first antenna dimension, and two orthogonal beams on a second antenna dimension.
  • the apparatus of a thirtieth aspect wherein the plurality of wideband parameters of the first PMI are dependent on a number of ports in first and second dimensions of an antenna array and an oversampling rate per first and second dimensions.
  • the apparatus of a thirty-first aspect further including configuration of the at least one processor:
  • PUCCH physical uplink control channel
  • the apparatus of a thirty-second aspect wherein the precoded transmissions are precoded using the linear combination in response to a rank being less than 3, and wherein the precoded transmissions are precoded using a non-linear combination beam selection of one of the two DFT beams in response to the rank being greater than or equal to 3.
  • the apparatus of a thirty-third aspect wherein the plurality of signals are a plurality of beamformed channel state information (CSI) reference signals (CSI-RS) , and wherein the plurality of wideband parameters of the first PMI include wideband beam pair combination parameters.
  • CSI channel state information
  • CSI-RS beamformed channel state information reference signals
  • a thirty-fourth aspect of the present disclosure includes an apparatus of any combination of the twenty-seventh through thirty-third aspects.
  • the present disclosure comprises a thirty-fifth aspect, such as an apparatus configured for wireless communication, the apparatus comprising:
  • the at least one processor is configured:
  • CSI channel state information
  • PMI precoding matrix indicator
  • the second PMI includes first and second parameters that identify a primary beam and a secondary beam from the grid of beams determined from the first PMI;
  • the precoded transmissions are precoded based on one or more of the two DFT beams.
  • the apparatus of a thirty-sixth aspect wherein the first and second parameters of the second PMI are one of: wideband or subband, based on a predetermined CSI reporting mode configuration, wherein the first parameter identifies beam selection and co-phasing of the primary beam, and wherein the second parameter identifies beam selection, co-phasing, and complex coefficient of the secondary beam.
  • the apparatus of a thirty-seventh aspect wherein the plurality of wideband parameters of the first PMI are dependent on a number of ports in first and second dimensions of an antenna array and an oversampling rate per first and second dimensions.
  • the apparatus of a thirty-eighth aspect wherein the second parameter is one of: independent from or dependent on the first parameter.
  • the apparatus of a thirty-ninth aspect wherein the second parameter is dependent on the first parameter, wherein the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • the apparatus of a fortieth aspect wherein the second parameter is independent of the first parameter, wherein the precoded transmissions are precoded based on a non-linear combination beam selection of one of the two DFT beams.
  • the apparatus of a forty-first aspect wherein the precoded transmissions are precoded based on the non-linear combination beam selection of one of the two DFT beams when the second parameter is below a predefined threshold, and wherein the precoded transmissions are precoded based on the linear combination when the second parameter is greater than or equal to the predefined threshold.
  • the apparatus of a forty-second aspect further including configuration of the at least one processor:
  • PUCCH physical uplink control channel
  • the apparatus of forty-third aspect wherein the precoded transmissions are precoded using the linear combination in response to a rank being less than 3, and wherein the precoded transmissions are precoded using a non-linear combination beam selection of one of the two DFT beams in response to the rank being greater than or equal to 3.
  • the apparatus of a forty-fourth aspect wherein the plurality of signals are a plurality of beamformed channel state information (CSI) reference signals (CSI-RS) , and wherein the second PMI includes a wideband first parameter that identifies beam selection and co-phasing of the primary beam and the second parameter that identifies beam selection, co-phasing, and complex coefficient of the secondary beam.
  • CSI channel state information
  • a forty-fifth aspect includes an apparatus of any combination of the thirty-fifth through forty-fourth aspects.
  • the present disclosure comprises a forty-sixth aspect, such as an apparatus configured for wireless communication, the apparatus comprising:
  • the at least one processor is configured:
  • CSI channel state information
  • PMI precoding matrix indicator
  • the second PMI includes a first parameter that provides beam selection of two DFT beams from the grid of beams, complex coefficient, and a common co-phasing for the two DFT beams;
  • the precoded transmissions are precoded based on a linear combination of the two DFT beams.
  • the apparatus of a forty-seventh aspect wherein the plurality of wideband parameters of the first PMI are dependent on a number of ports in first and second dimensions of an antenna array and an oversampling rate per first and second dimensions.
  • the apparatus of a forty-eighth aspect wherein the second PMI is one of: wideband or subband, based on a predetermined CSI reporting mode configuration.
  • the apparatus of a forty-ninth aspect further including configuration of the at least one processor:
  • PUCCH physical uplink control channel
  • the apparatus of a fiftieth aspect wherein the precoded transmissions are precoded using the linear combination in response to a rank being less than 3, and wherein the precoded transmissions are precoded using a non-linear combination beam selection of one of the two DFT beams in response to the rank being greater than or equal to 3.
  • the apparatus of a fifty-first aspect wherein the plurality of signals are a plurality of beamformed channel state information (CSI) reference signals (CSI-RS) , and wherein the first PMI is not reported.
  • CSI channel state information
  • a fifty-second aspect of the present disclosure includes an apparatus of any combination of the forty-sixth through fifty-first aspects.
  • the functional blocks and modules described herein may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., 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.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, 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 the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal.
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented through computer-executable instructions in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose 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 means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • a connection may be properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL) , then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium.
  • DSL digital subscriber line
  • 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.
  • the term “and/or, ” when used in a list of two or more items means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
  • the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un livre de codes de combinaison linéaire amélioré utilisant un précodeur composite représenté par une combinaison linéaire de deux vecteurs de précodage par DFT. Dans une première option avec une sélection de paire de faisceaux à large bande, des précodeurs d'un livre de codes W1 permettent l'identification des deux faisceaux de DFT, qui peuvent être orthogonaux ou non orthogonaux entre eux. Dans cette première option, un nouveau livre de codes W1/W2 peut être utilisé. La deuxième option comprend une sélection de faisceau primaire à large bande, dans laquelle le livre de codes W1 patrimonial peut être réutilisé pour définir la grille de faisceaux en association avec une nouvelle conception de livre de codes W2 pour la sélection de faisceau. La troisième option permet une sélection de paire de faisceau de sous-bande avec un cophasage commun (φ1 ＝ φ2), qui réutilise aussi le livre de codes W1 patrimonial pour définir la grille de faisceaux en association avec un nouveau livre de codes W2 pour la sélection de faisceau.
PCT/CN2016/081310 2016-05-06 2016-05-06 Amélioration de livres de codes de combinaison linéaire en fd-mimo WO2017190356A1 (fr)

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CN111937322B (zh) * 2018-04-10 2023-09-08 高通股份有限公司 物理上行链路控制信道可靠性增强
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CN112514334B (zh) * 2018-06-01 2024-05-03 弗劳恩霍夫应用研究促进协会 基于高阶pca分解或pca合成的显式信道信息反馈
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WO2020060345A1 (fr) * 2018-09-21 2020-03-26 엘지전자 주식회사 Procédé de transmission et de réception d'informations d'état de canal sur la base d'un livre de codes haute résolution dans un système de communication sans fil, et appareil associé
CN112771787B (zh) * 2018-09-27 2024-03-19 高通股份有限公司 针对csi码本的子带粒度的线性组合
CN112771787A (zh) * 2018-09-27 2021-05-07 高通股份有限公司 针对csi码本的子带粒度的线性组合
CN111656846B (zh) * 2018-09-28 2023-10-10 联发科技股份有限公司 减少类型ii信道状态信息反馈开销的方法及装置
CN111656846A (zh) * 2018-09-28 2020-09-11 联发科技股份有限公司 移动通信中增强的类型ii信道状态信息
US11165475B2 (en) 2018-11-02 2021-11-02 At&T Intellectual Property I, L.P. Linear combination codebook based per layer power allocation feedback for 5G or other next generation network
US10707931B2 (en) 2018-11-02 2020-07-07 At&T Intellectual Property I, L.P. Linear combination codebook based per layer power allocation feedback for 5G or other next generation network
WO2020118549A1 (fr) * 2018-12-12 2020-06-18 Qualcomm Incorporated Rapport de coefficients pour renvoi d'informations d'état de canal (csi) compressées
US12015467B2 (en) 2018-12-12 2024-06-18 Qualcomm Incorporated Coefficients report for compressed CSI feedback
US11509367B2 (en) 2018-12-24 2022-11-22 Qualcomm Incorporated Coefficient determination for measurement report feedback in multi-layer beamformed communications
WO2020132788A1 (fr) * 2018-12-24 2020-07-02 Qualcomm Incorporated Détermination de coefficient destinée à un retour d'information sur un rapport de mesure dans des communications à formation de faisceau multicouche
US12021585B2 (en) 2018-12-24 2024-06-25 Qualcomm Incorporated Coefficient determination for measurement report feedback in multi-layer beamformed communications
WO2022246716A1 (fr) * 2021-05-27 2022-12-01 Qualcomm Incorporated Techniques de communication assistées par réseau neuronal
WO2023201605A1 (fr) * 2022-04-21 2023-10-26 Qualcomm Incorporated Livres de code de transformée de fourier discrète non orthogonale pour des signaux d'informations d'état de canal

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