WO2017111642A1 - Beam discovery reporting for spatial multiplexing - Google Patents

Beam discovery reporting for spatial multiplexing Download PDF

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Publication number
WO2017111642A1
WO2017111642A1 PCT/RU2015/000904 RU2015000904W WO2017111642A1 WO 2017111642 A1 WO2017111642 A1 WO 2017111642A1 RU 2015000904 W RU2015000904 W RU 2015000904W WO 2017111642 A1 WO2017111642 A1 WO 2017111642A1
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WO
WIPO (PCT)
Prior art keywords
candidate beam
beams
discovery
candidate
enb
Prior art date
Application number
PCT/RU2015/000904
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English (en)
French (fr)
Inventor
Alexei Vladimirovich Davydov
Gregory Vladimirovich Morozov
Hyejung Jung
Original Assignee
Intel Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intel Corporation filed Critical Intel Corporation
Priority to PCT/RU2015/000904 priority Critical patent/WO2017111642A1/en
Priority to TW105126713A priority patent/TW201724775A/zh
Publication of WO2017111642A1 publication Critical patent/WO2017111642A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • 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
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection

Definitions

  • Embodiments pertain to wireless communications. Some embodiments relate to wireless networks including 3GPP (Third Generation Partnership Project) networks, 3 GPP LTE (Long Term Evolution) networks, 3 GPP LTE-A (LTE
  • Some embodiments relate to beam discovery operations in networks that utilize spatial multiplexing such as multiple-input multiple-output (MIMO) techniques.
  • MIMO multiple-input multiple-output
  • spatial multiplexing generally involves transmitting signals using beamforming so that they propagate in a variety of selected directions.
  • angular selectivity may be employed in similar fashion to receive signals from one or more selected directions while suppressing signals from other directions.
  • directional transmission and directional reception may be used in coordinated fashion to find transmission beam directions that arrive either directly, or as reflections from one or more other directions, to the receiver. The receiver may distinguish the information arriving from each of the various directions under favorable conditions.
  • SU-MIMO single-user multiple-input/multiple-output
  • SU-MIMO single-user multiple-input/multiple-output
  • FIG. 1 is a functional diagram of a 3GPP network in accordance with some embodiments.
  • FIG. 2 is a block diagram of a User Equipment (UE) in accordance with some embodiments.
  • UE User Equipment
  • FIG. 3 is a block diagram of an Evolved Node-B (eNB) in accordance with some embodiments.
  • eNB Evolved Node-B
  • FIG. 4 illustrates examples of multiple beam transmission in accordance with some embodiments.
  • FIGs. 5A, 5B, and 5C are beam directionality diagrams illustrating multi- beam operation in greater detail according to some embodiments.
  • FIGs. 6A-6C are graphs depicting beam receive power measurement correction (BRPMC) functions according to various embodiments.
  • FIG. 7 is a flow diagram illustrating an example process of operating a UE to identify and report candidate beams for single-user multiple input/multiple output (SU-MIMO) operation according to some embodiments.
  • SU-MIMO single-user multiple input/multiple output
  • FIG. 8 is a flow diagram illustrating an example process of operating a eNB to configure a UE to identify and report candidate beams for single-user multiple input/multiple output (SU-MIMO) operation according to some embodiments.
  • SU-MIMO single-user multiple input/multiple output
  • FIG. 1 is a functional diagram of a 3GPP network in accordance with some embodiments.
  • the network comprises a radio access network (RAN) (e.g., as depicted, the E-UTRAN or evolved universal terrestrial radio access network) 101 and the core network 120 (e.g., shown as an evolved packet core (EPC)) coupled together through an SI interface 1 15.
  • RAN radio access network
  • EPC evolved packet core
  • the core network 120 includes a mobility management entity (MME) 122, a serving gateway (serving GW) 124, and packet data network gateway (PDN G W) 126.
  • the RAN 101 includes Evolved Node-B's (eNBs) 104 (which may operate as base stations) for communicating with User Equipment (UE) 102.
  • the eNBs 104 may include macro eNBs and low power (LP) eNBs.
  • the eNB 104 may transmit a downlink control message to the UE 102 to indicate an allocation of physical uplink control channel (PUCCH) channel resources.
  • the UE 102 may receive the downlink control message from the eNB 104, and may transmit an uplink control message to the eNB 104 in at least a portion of the PUCCH channel resources.
  • PUCCH physical uplink control channel
  • the MME 122 is similar in function to the control plane of legacy Serving GPRS Support Nodes (SGSN).
  • the MME 122 manages mobility aspects in access such as gateway selection and tracking area list management.
  • the serving GW 124 terminates the interface toward the RAN 101, and routes data packets between the RAN 101 and the core network 120. In addition, it may be a local mobility anchor point for inter-eNB handovers and also may provide an anchor for inter-3GPP mobility. Other responsibilities may include lawful intercept, charging, and some policy enforcement.
  • the serving GW 124 and the MME 122 may be implemented in one physical node or separate physical nodes.
  • the PDN GW 126 terminates an SGi interface toward the packet data network (PDN).
  • PDN packet data network
  • the PDN GW 126 routes data packets between the EPC 120 and the external PDN, and may be a key node for policy enforcement and charging data collection. It may also provide an anchor point for mobility with non-LTE accesses.
  • the external PDN can be any kind of IP network, as well as an IP Multimedia Subsystem (IMS) domain.
  • IMS IP Multimedia Subsystem
  • the PDN GW 126 and the serving GW 124 may be implemented in one physical node or separated physical nodes.
  • the OFDM signals may comprise a plurality of orthogonal subcarriers.
  • the SI interface 1 15 is the interface that separates the RAN 101 and the EPC 120. It is split into two parts: the Sl-U, which carries traffic data between the eNBs 104 and the serving GW 124, and the Sl-MME, which is a signaling interface between the eNBs 104 and the MME 122.
  • the X2 interface is the interface between eNBs 104.
  • the X2 interface comprises two parts, the X2-C and X2-U.
  • the X2-C is the control plane interface between the eNBs 104
  • the X2-U is the user plane interface between the eNBs 104.
  • LP cells are typically used to extend coverage to indoor areas where outdoor signals do not reach well, or to add network capacity in areas with very dense phone usage, such as train stations.
  • LP low power
  • eNB refers to any suitable relatively low power eNB for
  • Femtocell eNBs are typically provided by a mobile network operator to its residential or enterprise customers.
  • a femtocell is typically the size of a residential gateway or smaller and generally connects to the user's broadband line. Once plugged in, the femtocell connects to the mobile operator's mobile network and provides extra coverage in a range of typically 30 to 50 meters for residential femtocells.
  • a LP eNB might be a femtocell eNB since it is coupled through the PDN GW 126.
  • a picocell is a wireless communication system typically covering a small area, such as in-building (offices, shopping malls, train stations, etc.), or more recently in-aircraft.
  • a picocell eNB can generally connect through the X2 link to another eNB such as a macro eNB through its base station controller (BSC) functionality.
  • BSC base station controller
  • LP eNB may be implemented with a picocell eNB since it is coupled to a macro eNB via an X2 interface.
  • Picocell eNBs or other LP eNBs may incorporate some or all functionality of a macro eNB. In some cases, this may be referred to as an access point base station or enterprise femtocell.
  • a downlink resource grid may be used for downlink transmissions from an eNB 104 to a UE 102, while uplink transmission from the UE 102 to the eNB 104 may utilize similar techniques.
  • the grid may be a time-frequency grid, called a resource grid or time-frequency resource grid, which is the physical resource in the downlink in each slot.
  • a time-frequency plane representation is a common practice for OFDM systems, which makes it intuitive for radio resource allocation.
  • Each column and each row of the resource grid correspond to one OFDM symbol and one OFDM subcarrier, respectively.
  • the duration of the resource grid in the time domain corresponds to one slot in a radio frame.
  • Each resource grid comprises a number of resource blocks (RBs), which describe the mapping of certain physical channels to resource elements.
  • RBs resource blocks
  • Each resource block comprises a collection of resource elements in the frequency domain and may represent the smallest quanta of resources that currently can be allocated.
  • the physical downlink shared channel (PDSCH) carries user data and higher-layer signaling to a UE 102 (FIG. 1).
  • the physical downlink control channel (PDCCH) carries information about the transport format and resource allocations related to the PDSCH channel, among other things. It also informs the UE 102 about the transport format, resource allocation, and hybrid automatic repeat request (HARQ) information related to the uplink shared channel.
  • downlink scheduling (e.g., assigning control and shared channel resource blocks to UEs 102 within a cell) may be performed at the eNB 104 based on channel quality
  • the downlink resource assignment information may be sent to a UE 102 on the control channel (PDCCH) used for (assigned to) the UE 102.
  • PDCCH control channel
  • the PDCCH uses CCEs (control channel elements) to convey the control information.
  • CCEs control channel elements
  • the PDCCH complex- valued symbols are first organized into quadruplets, which are then permuted using a sub-block inter-leaver for rate matching.
  • Each PDCCH is transmitted using one or more of these control channel elements (CCEs), where each CCE corresponds to nine sets of four physical resource elements known as resource element groups (REGs).
  • RAGs resource element groups
  • Four QPSK symbols are mapped to each REG.
  • circuitry may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, or other suitable hardware components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • the circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • circuitry may include logic, at least partially operable in hardware. Embodiments described herein may be implemented into a system using any suitably configured hardware or software.
  • FIG. 2 is a functional diagram of a User Equipment (UE) in accordance with some embodiments.
  • the UE 200 may be suitable for use as a UE 102 as depicted in FIG. 1.
  • the UE 200 may include application circuitry 202, baseband circuitry 204, Radio Frequency (RF) circuitry 206, front-end module (FEM) circuitry 208 and one or more antennas 210, coupled together at least as shown.
  • RF Radio Frequency
  • FEM front-end module
  • other circuitry or arrangements may include one or more elements or components of the application circuitry 202, the baseband circuitry 204, the RF circuitry 206 or the FEM circuitry 208, and may also include other elements or components in some cases.
  • the application circuitry 202 may include one or more application processors.
  • the application circuitry 202 may include circuitry such as, but not limited to, one or more single-core or multi-core processors.
  • the processor(s) may include any combination of general-purpose processors and dedicated processors (e.g., graphics processors, application processors, etc.).
  • the processors may be coupled with or may include memory/storage and may be configured to execute instructions stored in the memory/storage to enable various applications or operating systems to run on the system.
  • the baseband circuitry 204 may include circuitry such as, but not limited to, one or more single-core or multi-core processors.
  • the baseband circuitry 204 may include one or more baseband processors or control logic to process baseband signals received from a receive signal path of the RF circuitry 206 and to generate baseband signals for a transmit signal path of the RF circuitry 206.
  • Baseband processing circuity 204 may interface with the application circuitry 202 for generation and processing of the baseband signals and for controlling operations of the RF circuitry 206.
  • modulation/demodulation circuitry of the baseband circuitry 204 may include Fast-Fourier Transform (FFT), precoding, or constellation mapping/demapping functionality.
  • encoding/decoding circuitry of the baseband circuitry 204 may include convolution, tail-biting convolution, turbo, Viterbi, or Low Density Parity Check (LDPC) encoder/decoder functionality.
  • Embodiments of modulation/demodulation and encoder/decoder functionality are not limited to these examples and may include other suitable functionality in other embodiments.
  • the baseband circuitry 204 may include elements of a protocol stack such as, for example, elements of an evolved universal terrestrial radio access network (EUTRAN) protocol including, for example, physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), or radio resource control (RRC) elements.
  • EUTRAN evolved universal terrestrial radio access network
  • a central processing unit (CPU) 204e of the baseband circuitry 204 may be configured to run elements of the protocol stack for signaling of the PHY, MAC, RLC, PDCP or RRC layers.
  • the baseband circuitry may include one or more audio digital signal processor(s) (DSP) 204f.
  • DSP audio digital signal processor
  • the audio DSP(s) 204f may be include elements for compression/decompression and echo cancellation and may include other suitable processing elements in other embodiments.
  • Components of the baseband circuitry may be suitably combined in a single chip, a single chipset, or disposed on a same circuit board in some embodiments.
  • some or all of the constituent components of the baseband circuitry 204 and the application circuitry 202 may be implemented together such as, for example, on a system on a chip (SOC).
  • SOC system on a chip
  • the baseband circuitry 204 may provide for communication compatible with one or more radio technologies.
  • the baseband circuitry 204 may support communication with an evolved universal terrestrial radio access network (EUTRAN) or other wireless metropolitan area networks (WMAN), a wireless local area network (WLAN), a wireless personal area network (WPAN).
  • EUTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • Embodiments in which the baseband circuitry 204 is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.
  • the RF circuitry 206 may include a receive signal path and a transmit signal path.
  • the receive signal path of the RF circuitry 206 may include mixer circuitry 206a, amplifier circuitry 206b and filter circuitry 206c.
  • the transmit signal path of the RF circuitry 206 may include filter circuitry 206c and mixer circuitry 206a.
  • RF circuitry 206 may also include synthesizer circuitry 206d for synthesizing a frequency for use by the mixer circuitry 206a of the receive signal path and the transmit signal path.
  • the mixer circuitry 206a of the receive signal path may be configured to down-convert RF signals received from the FEM circuitry 208 based on the synthesized frequency provided by synthesizer circuitry 206d.
  • the amplifier circuitry 206b may be configured to amplify the down- converted signals and the filter circuitry 206c may be a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down- converted signals to generate output baseband signals.
  • LPF low-pass filter
  • BPF band-pass filter
  • the mixer circuitry 206a of the receive signal path and the mixer circuitry 206a of the transmit signal path may include two or more mixers and may be arranged for quadrature downconversion or upconversion respectively.
  • the mixer circuitry 206a of the receive signal path and the mixer circuitry 206a of the transmit signal path may include two or more mixers and may be arranged for image rejection (e.g., Hartley image rejection).
  • the mixer circuitry 206a of the receive signal path and the mixer circuitry 206a may be arranged for direct downconversion or direct upconversion, respectively.
  • the mixer circuitry 206a of the receive signal path and the mixer circuitry 206a of the transmit signal path may be configured for super-heterodyne operation.
  • the output baseband signals and the input baseband signals may be analog baseband signals, although the scope of the embodiments is not limited in this respect.
  • the output baseband signals and the input baseband signals may be digital baseband signals.
  • the RF circuitry 206 may include analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry and the baseband circuitry 204 may include a digital baseband interface to communicate with the RF circuitry 206.
  • ADC analog-to-digital converter
  • DAC digital-to-analog converter
  • a separate radio IC circuitry may be provided for processing signals for each spectrum, although the scope of the embodiments is not limited in this respect.
  • the synthesizer circuitry 206d may be a fractional-N synthesizer or a fractional N/N+l synthesizer, although the scope of the
  • synthesizer circuitry 206d may be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer comprising a phase-locked loop with a frequency divider.
  • the synthesizer circuitry 206d may be configured to synthesize an output frequency for use by the mixer circuitry 206a of the RF circuitry 206 based on a frequency input and a divider control input.
  • the synthesizer circuitry 206d may be a fractional N/N+l synthesizer.
  • frequency input may be provided by a voltage controlled oscillator (VCO), although that is not a requirement.
  • VCO voltage controlled oscillator
  • Synthesizer circuitry 206d of the RF circuitry 206 may include a divider, a delay-locked loop (DLL), a multiplexer and a phase accumulator.
  • the divider may be a dual modulus divider (DMD) and the phase accumulator may be a digital phase accumulator (DP A).
  • the DMD may be configured to divide the input signal by either N or N+1 (e.g., based on a carry out) to provide a fractional division ratio.
  • the DLL may include a set of cascaded, tunable, delay elements, a phase detector, a charge pump and a D-type flip-flop.
  • synthesizer circuitry 206d may be configured to generate a carrier frequency as the output frequency, while in other embodiments, the output frequency may be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency) and used in conjunction with quadrature generator and divider circuitry to generate multiple signals at the carrier frequency with multiple different phases with respect to each other.
  • the output frequency may be a LO frequency (fix>)-
  • the RF circuitry 206 may include an IQ/polar converter.
  • FEM circuitry 208 may include a receive signal path which may include circuitry configured to operate on RF signals received from one or more antennas 210, amplify the received signals and provide the amplified versions of the received signals to the RF circuitry 206 for further processing.
  • FEM circuitry 208 may also include a transmit signal path which may include circuitry configured to amplify signals for transmission provided by the RF circuitry 206 for transmission by one or more of the one or more antennas 210.
  • the FEM circuitry 208 may include a TX/RX switch to switch between transmit mode and receive mode operation.
  • the FEM circuitry may include a receive signal path and a transmit signal path.
  • the receive signal path of the FEM circuitry may include a low-noise amplifier (LNA) to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to the RF circuitry 206).
  • LNA low-noise amplifier
  • the eNB 300 may be suitable for use as an eNB 104. as depicted in FIG. 1.
  • the eNB 300 may include physical layer circuitry 302 and a transceiver 305, one or both of which may enable transmission and reception of signals to and from the UE 200, other eNBs, other UEs or other devices using one or more antennas 301.
  • the physical layer circuitry 302 may perform various encoding and decoding functions that may include formation of baseband signals for transmission and decoding of received signals.
  • the transceiver 305 may perform various transmission and reception functions such as conversion of signals between a baseband range and a Radio Frequency (RF) range.
  • RF Radio Frequency
  • the physical layer circuitry 302 and the transceiver 305 may be separate components or may be part of a combined component.
  • some of the described functionality related to transmission and reception of signals may be performed by a combination that may include one, any or all of the physical layer circuitry 302, the transceiver 305, and other components or layers.
  • the eNB 300 may also include medium access control layer (MAC) circuitry 304 for controlling access to the wireless medium.
  • the eNB 300 may also include processing circuitry 306 and memory 308 arranged to perform the operations described herein.
  • the eNB 300 may also include one or more interfaces 310, which may enable communication with other components, including other eNBs 104 (FIG. 1 ), components in the EPC 120 (FIG. 1 ) or other network components.
  • the interfaces 310 may enable communication with other components that may not be shown in FIG. 1, including components external to the network.
  • the interfaces 310 may be wired or wireless or a combination thereof.
  • the UE 200 or the eNB 300 may be a mobile device and may be a portable wireless communication device, such as a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a smartphone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a wearable device such as a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), or other device that may receive or transmit information wirelessly.
  • PDA personal digital assistant
  • a laptop or portable computer with wireless communication capability such as a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a smartphone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a wearable device such as a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), or other device that may
  • Mobile devices or other devices in some embodiments may be configured to operate according to other protocols or standards, including IEEE 802.1 1 or other IEEE standards.
  • the UE 200, eNB 300 or other device may include one or more of a keyboard, a display, a non- volatile memory port, multiple antennas, a graphics processor, an application processor, speakers, and other mobile device elements.
  • the display may be an LCD screen including a touch screen.
  • Embodiments may be implemented in one or a combination of hardware, firmware and software. Embodiments may also be implemented as instructions stored on a computer-readable storage device, which may be read and executed by at least one processor to perform the operations described herein.
  • a computer-readable storage device may include any non-transitory mechanism for storing information in a form readable by a machine (e.g., a computer).
  • a computer-readable storage device may include read-only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash-memory devices, and other storage devices and media.
  • Some embodiments may include one or more processors and may be configured with instructions stored on a computer-readable storage device.
  • UE 102 may receive a significant amount of energy from the beams 415 and 420 as shown.
  • the beams 405-420 may be transmitted using different reference signals, and the UE 102 may determine channel-state information (CSI) feedback or other information for beams 415 and 420.
  • each of beams 405-420 are configured as CSI reference signals (CSI-RS).
  • the CSI-RS signal is a part of the discovery reference signaling (DRS) configuration.
  • the DRS configuration may serve to inform the UE 102 about the physical resources (e.g., subframes, subcarriers) on which the CSI-RS signal will be found.
  • the UE 102 is further informed about any scrambling sequences that are to be applied for CSI-RS.
  • the UE 102 may determine angles or other information (such as CSI feedback, channel-quality indicator (CQI) or other) for the beams 465 and 470.
  • the UE 102 may also determine such information when received at other angles, such as the illustrated beams 475 and 480.
  • the beams 475 and 480 are demarcated using a dotted line configuration to indicate that they may not necessarily be transmitted at those angles, but that the UE 102 may determine the beam directions of beams 475 and 480 using such techniques as receive beam- forming, as receive directions. This situation may occur, for example, when a transmitted beam reflects from an object in the vicinity of the UE 102, and arrives at the UE 102 according to its reflected, rather than incident, angle.
  • the UE 102 may transmit one or more channel state information (CSI) messages to the eNB 104 as reporting messaging.
  • CSI channel state information
  • Embodiments are not limited to dedicated CSI messaging, however, as the UE 102 may include relevant reporting information in control messages or other types of messages that may or may not be dedicated for communication of the CSI-type information.
  • the first signal received from the first eNB 104 may include a first directional beam based at least partly on a first CSI-RS signal and a second directional beam based at least partly on a second CSI-RS signal.
  • the UE 102 may determine a rank indicator (RI) for the first CSI-RS and an RI for the second CSI-RS, and may transmit both RIs in the CSI messages.
  • the UE 102 may determine one or more RIs for the second signal, and may also include them in the CSI messages in some cases.
  • the UE 102 may also determine a CQI, a precoding matrix indicator (PMI), receive angles or other information for one or both of the first and second signals.
  • PMI precoding matrix indicator
  • Such information may be included, along with one or more RIs, in the one or more CSI messages.
  • the UE 102 performs reference signal receive power (RSRP) measurement, received signal strength indication (RSSI) measurement, reference signal receive quality (RSRQ) measurement, or some combination of these using CSI-RS signals.
  • RSRP reference signal receive power
  • RSSI received signal strength indication
  • RSSRQ reference signal receive quality
  • the first signal received from the eNB 104 may include a first directional beam based at least partly on a first CSI-RS signal and a second directional beam based at least partly on a second CSI-RS signal.
  • the UE 102 may determine a first measurement for the first directional beam and a second
  • the UE 102 may determine first and second CQIs related to reception of the signal at the first and second angles.
  • the UE 102 may also determine a selected angle between the first angle and the second angle, wherein a CQI for reception of the first signal at the selected angle is greater than the first and second CQIs.
  • the selected angle may be a better angle for reception in comparison to the first and second angles, in some cases.
  • the selected angle or the CQI for reception of the first signal at the selected angle may be indicated in the one or more CSI messages, in addition to or instead of other CSI feedback described herein.
  • the UE 102 may be configured with one or more CSI processes per serving cell by higher layers. Each CSI process may be associated with a CSI
  • CSI-RS Reference Signal
  • CSI-IM CSI- interference measurement
  • the beam discovery procedure may be facilitated using measurements by the UE 102 of CSI-RS resources corresponding to different beam directions, and reporting on those multiple-beamformed CSI-RS resources.
  • a beam formed CSI-RS resource may be a DRS-CSI-RS resource that is configured to the UE 102 as part of a DRS configuration.
  • the UE 102 may use the configured DRS-CSI-RS resources for measurement and reporting (for instance, using RSRP measurements).
  • the received RSRP reports for instance, using RSRP measurements.
  • corresponding to the beamformed DRS-CSI-RS resources may be used by the eNB to identify candidate beams for single-user MIMO (SU-MIMO) transmissions.
  • SU-MIMO single-user MIMO
  • FIGs. 5A, 5B, and 5C are a beam directionality diagrams illustrating multi- beam operation in greater detail according to some embodiments.
  • Scenario 500 is depicted in FIG. 5 A, in which an eNB 104 transmits a series of beam discovery signal beams 502 at the various beam-formed angles depicted.
  • discovery signal beams 502 are shown for one sector, particularly, the sector between -60° and 60°, although it will be understood that the discovery signal transmissions by eNB 104 may be transmitted in other sectors as well.
  • angles at which the individual discovery beams 502 are received by the UE 102 may vary considerably, depending on whether each individual beam is received as line-of-sight, or reflected from an object, building, or other structure near or around the UE 102.
  • the discovery beams 502 are spaced, in an angular sense, very closely.
  • This fine inter-beam angular separation may be produced by a technique of using over-sampled DFT vectors to provide spatial resolution, for instance, to produce overlapping beams, as shown.
  • adjacent overlapping beams are used to reduce the edge effect in frequency-selective precoding.
  • closely-spaced, overlapping, beams are sub- optimal because they may interfere with one another.
  • UE 102 As UE 102 receives the discovery beams 502, each of which may carry a CSI-RS according to some embodiments, it assesses each beam's beam quality (e.g., via RSRP, RSRQ, or other measure), and provides reporting to eNB 104 upon which the eNB 104 may determine beams for use with MIMO transmission.
  • An example of such a report is a DRS-CSI-RS RSRP report.
  • the UE 102 Given the large quantity of discovery beams 502, it may be impractical for the UE 102 to report the beam quality or other measure for each and every individual beam of discovery beams 502 due to the signaling overhead such reporting would entail.
  • the decision as to whether the UE 102 sends a report for a given beam may be threshold-limited to only the best-performing candidate beams, as assessed by the UE 102.
  • the reporting decision is made by the UE 102 based on one or more of the following reporting selection criteria:
  • RSRP RSRP
  • N and M are defined numerical quantity limits representing the maximum number of candidate beams to be reported. For instance, N and M may be limits of 4, 8, 16, etc., beams to be reported to the eNB 104.
  • Application of this reporting selection criteria e.g., RSRP may select the strongest received beams as candidate beams, but the criteria fails to account for the angular proximity of candidate beams, resulting in the possibility of the selection of overlapping, mutually-interfering, beams, the combination of which presents a sub- optimal diversity of beam directions for use with spatial multiplexing such as SU- MIMO.
  • FIG. 5B illustrates an example of the received signal power of discovery beams 502, as measured by UE 102.
  • the receive beam angles are depicted in FIG. 5B consistent with the as- transmitted angular directions.
  • Received beam clusters 504' and 506' correspond respectively to transmitted discovery beam clusters 504 and 506.
  • received beam clusters 504' and 506' include beams that exceed reporting threshold 508.
  • reporting threshold 508 may be defined as an absolute threshold, or as a relative threshold based on some difference from a reference signal, such as a maximum-RSRP beam, for example.
  • the reporting threshold 508 may be configured in the UE 102 by the eNB 504.
  • the reporting selection criteria for reporting candidate beams by the UE 102 to the eNB 104 gives preferential weighting to received beams based on the signal power measurements and on angular separation of beam direction.
  • some of the power measurements of the beams of received beam cluster 504' are discounted, such that the reporting of candidate beams includes one or more beams from among received beam cluster 506'.
  • FIG. 5C illustrates an example result of application of beam receive power measurement correction (BRPMC) according to some embodiments.
  • corrected received beam cluster 514 represents the result of the BRPMC applied to received beam cluster 504'
  • corrected received beam cluster 516 represents the result of the BRPMC applied to received beam cluster 506' .
  • Corrected received beam cluster 514 has individual beams 514A, 514B, and 514C that exceed threshold 508, and corrected received beam cluster 516 has individual beam 516A that exceeds threshold 508. These top four received beams, 514A-C, and 516A, meeting the reporting selection criteria, may be reported to the eNB 104.
  • the BRPMC is applied as a scaling, or discount, of the receive power measurement as a function of angular offset from the dominant beam of each beam cluster.
  • the BRPMC is applied as an exclusion of certain beams based on their angular proximity to the dominant beam of each cluster.
  • application of the BRPMC prior to applying the beam gives preferential weighting to beams based on their received signal power and on their angular separation. In one example, beams having greater angular separation from one another are given greater (i.e., more preferential) weight.
  • FIGs. 6A-6C are graphs depicting beam receive power measurement correction (BRPMC) functions according to various embodiments.
  • BRPMC beam receive power measurement correction
  • scaling functions 600, 620, and 630 are respectively graphically illustrated according to some embodiments, with the scaling factor plotted along the vertical axis, versus offset angle plotted along the horizontal axis.
  • a scaling factor of 1.0 represents no scaling, whereas a scaling factor of zero indicates complete exclusion of portions of the receive power measurement.
  • the vertical axis, at 0°, may be aligned with the dominant beam of a given cluster of beams.
  • BRPMC function 620 blocks the dominant beam of the cluster. There is no non-scaling portion in the center. Discount portion 624 applies at the zero-offset angle, and progressively relaxes with increasing angular offset from the center, as indicated at 624A, 624B, or 624C. At the periphery at 626, the beam cluster is not discounted.
  • FIG. 6C illustrates BRPMC function 630, which has a non-scaling portion 632 in the center to pass the dominant beam of the cluster, and beam omission portion 634 to reject all beams within a defined angular offset from the center.
  • Beams to the periphery at 636 are not discounted.
  • the BRPMC function or some parameter of the BRPMC function, is configured in the UE 102 by the eNB 104.
  • a BRPMC parameter may be configured for each reference signal on which the receive power measurements are performed by the UE 102.
  • a set of BRPMC parameters may be configured to the UE 102, with different parameter settings applicable to different discovered reference signals or beams.
  • the eNB and the UE 102 identify specific beams in terms of a beam index difference between the discovered reference beam and the measured beams (for instance, P d (abs(k-k')), where P d represents the signal power
  • k' is the index of the reference beam and k is the index of the measured beam.
  • the Pd parameter for a subject beam may be determined by the eNB 102 by computing the square of the scalar product between the vector of antenna weights corresponding to the subject beam and denoted as w (where w is a vector of dimension N tx by 1 , where N tx is the number of transmitting antennas) and a vector of antenna weights corresponding to the reference beam and denoted as w ref , e.g.,
  • FIG. 7 is a flow diagram illustrating an example process of operating a UE to identify candidate beams for single-user multiple input/multiple output (SU- MIMO) operation according to some embodiments.
  • the example process may be performed by UE 102, or by a UE device having a different architecture.
  • the process is a machine-implemented process that operates autonomously (i.e., without user interaction).
  • the process is a richly-featured embodiment that may be realized as described; in addition, portions of the process may be implemented while others are excluded in various
  • the UE receives configuration information from an eNB, such as eNB 104, that configures the UE to perform beam measurement.
  • beam discovery signaling such as DRS-CSI-RS signaling
  • DRS-CSI-RS signaling is received from the eNB, with beams of different angular directions.
  • Decision 706 and operation 708 are iterated, as illustrated, to determine signal power and directionality information for each received beam.
  • each discovery beam includes an indication representing its angular direction, which may be a direction indicator, or an index value.
  • operation 710 applies the received power measurement threshold to identify potential candidate beams. This operation serves to exclude beams registering low receive power from further processing.
  • the angular directions of the potential candidate beams are assessed, along with the measured beam received power, (e.g., RSRP) to identify received beam clusters that may be usable for MIMO communications.
  • the dominant beam of each cluster is identified.
  • the angular offset-based discount e.g., BRPMC
  • the result of this operation is a discounting of measured power of beams that are overlapping with angularly-spaced-apart usable beams for MIMO communications.
  • the reporting limit criteria e.g., max quantity of beams to be reported
  • the reporting messaging is sent to the eNB.
  • the UE receives spatially-multiplexed data from the eNB on beams having directions based on the reporting.
  • FIG. 8 is a flow diagram illustrating an example process of operating a eNB to configure a UE to identify and report candidate beams for single-user multiple input/multiple output (SU-MIMO) operation according to some embodiments.
  • the eNB transmits configuration information for beam measurement to the UE.
  • the configuration information may include such parameters as the BRPMC parameters, reporting selection criteria, beam reporting limit, thresholds for detecting potential candidate beams, and the like.
  • the eNB transmits discovery signals on different beam directions, as described above. In related embodiments, directionality information is provided along with the discovery signals.
  • the directionality information may indicate angles of beam forming, or indices associated with beam directions.
  • the eNB receives reporting messaging from the UE, which identifies beam directions of the candidate beams discovered and determined to be suitable for SU-MIMO, according to any suitable embodiment described above.
  • the eNB determines a suitable SU-MIMO mode of operation.
  • the eNB processes the reporting messaging to determine if SU-MIMO communications are suitable for the UE based on the reported performance measures. Myriad other factors may be taken into account by the eNB in making the decision, including such factors as inter-cell interference, the quantity of other UEs in the cell, the degree of mobility of the UE, etc.
  • some of the embodiments described herein provide new operational solutions, which may be available within existing operational UE and eNB frameworks for some embodiments, to report viable, angularly-diverse, beam directions that may be used for SU-MIMO operations.
  • the angular diversity helps to use beam angles that avoid selection of closely-spaced beams that might otherwise interfere with one another.
  • Example 1 is an apparatus for User Equipment (UE) having single-user multiple-input/multiple-output (SU-MIMO) operability, the apparatus comprising transceiver circuitry and processing circuitry, the processing circuitry to: control the transceiver circuitry to receive, from an Evolved Node-B (eNB), a plurality of discovery signals carried via corresponding directional beams having various angular directions; determine received signal power measurements and directionality information of the corresponding directional beams of the discovery signals;
  • eNB Evolved Node-B
  • Example 2 the subject matter of Example 1 optionally includes, wherein the processing circuitry is further configured to: control the transceiver circuitry to receive, from the Evolved Node-B (eNB), spatially-multiplexed data
  • eNB Evolved Node-B
  • Example 3 the subject matter of any one or more of Examples 1-2 optionally include, wherein the processing circuitry is further configured to: control the transceiver circuitry to receive the selection criteria from an Evolved Node-B (eNB).
  • eNB Evolved Node-B
  • Example 5 the subject matter of any one or more of Examples 1-4 optionally include, wherein the discovery signals include channel-state information (CSI) reference signals.
  • the discovery signals include channel-state information (CSI) reference signals.
  • CSI channel-state information
  • Example 6 the subject matter of any one or more of Examples 1-5 optionally include, wherein the received signal power measurement is a reference signal receive power (RSRP) measurement.
  • RSRP reference signal receive power
  • Example 8 the subject matter of any one or more of Examples 1-7 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 9 the subject matter of any one or more of Examples 1-8 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a the plurality of discovery signals.
  • Example 10 the subject matter of Example 9 optionally includes, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 1 1 the subject matter of any one or more of Examples 9-10 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a reference discovery signal.
  • Example 12 the subject matter of any one or more of Examples 9-1 1 optionally include, wherein the discount is defined as progressively decreasing with increasing angular separation from the dominant discovery signal.
  • Example 13 the subject matter of any one or more of Examples 9-12 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 14 the subject matter of any one or more of Examples 1-13 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the processing circuitry to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 15 the subject matter of Example 14 optionally includes, wherein the selection criteria for candidate beam selection, when applied, cause the processing circuitry to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction wherein SU-MIMO signaling along the first beam direction and SU-MIMO signaling along the second beam direction do not mutually interfere.
  • Example 16 the subject matter of any one or more of Examples 14-15 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the processing circuitry to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 17 the subject matter of any one or more of Examples 1-16 optionally include, wherein the processing circuitry includes a baseband processor to decode the plurality of received discovery signals.
  • Example 18 the subject matter of Example 18 optionally includes, further comprising at least two antennas coupled to the transceiver circuitry and configured to receive signals from the eNB.
  • Example 19 is an apparatus for an Evolved Node-B (eNB) base station having single-user multiple-input/multiple-output (SU-MIMO) operability, the apparatus comprising transceiver circuitry and processing circuitry, the processing circuitry configured to: control the transceiver circuitry to transmit a plurality of discovery signals carried via corresponding directional beams, each directional beam having a different angular direction; for each of the discovery signals, control the transceiver circuitry to transmit directionality information of the corresponding directional beam; and control the transceiver circuitry to receive, from a user equipment (UE) reporting messaging that identifies a set of candidate beam directions, the candidate beam directions having been determined by the UE from among the directional beams according to selection criteria that apply preferential weighting to beams based on a combination of measured received signal power and angular separation of beam direction
  • UE user equipment
  • Example 20 the subject matter of Example 19 optionally includes, wherein the processing circuitry is further configured to: control the transceiver circuitry to transmit spatially-multiplexed data communications for reception by the UE via a plurality of SU-MIMO layers via at least a portion of the set of candidate beam directions.
  • Example 21 the subject matter of any one or more of Examples 19-20 optionally include, wherein the processing circuitry is further configured to: control the transceiver circuitry to transmit the selection criteria to a UE.
  • Example 22 the subject matter of any one or more of Examples 19-21 optionally include, wherein each one of the directional beams of the plurality of discovery signals overlaps with at least one other directional beam.
  • Example 23 the subject matter of any one or more of Examples 19-22 optionally include, wherein the discovery signals include channel-state information (CSI) reference signals.
  • CSI channel-state information
  • Example 25 the subject matter of any one or more of Examples 19-24 optionally include, wherein the directionality information includes an angular indication value.
  • Example 26 the subject matter of any one or more of Examples 19-25 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 27 the subject matter of any one or more of Examples 19-26 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a the plurality of discovery signals.
  • Example 28 the subject matter of Example 27 optionally includes, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 29 the subject matter of any one or more of Examples 27-28 optionally include, wherein the discount is defined as progressively decreasing with increasing angular separation from the dominant discovery signal.
  • Example 30 the subject matter of any one or more of Examples 27-29 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 31 the subject matter of any one or more of Examples 19-30 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 33 the subject matter of any one or more of Examples 31-32 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 35 the subject matter of Example 34 optionally includes, wherein the instructions are to further cause the UE to: receive, from the Evolved Node-B (eNB), spatially-multiplexed data communications via a plurality of SU- MIMO layers transmitted via at least a portion of the set of candidate beam directions.
  • eNB Evolved Node-B
  • Example 36 the subject matter of any one or more of Examples 34-35 optionally include, wherein each one of the directional beams of the plurality of discovery signals spatially overlaps with at least one other directional beam.
  • Example 37 the subject matter of any one or more of Examples 34-36 optionally include, wherein the discovery signals include channel-state information (CSI) reference signals.
  • CSI channel-state information
  • Example 38 the subject matter of any one or more of Examples 34-37 optionally include, wherein the received signal power measurement is a reference signal receive power (RSRP) measurement.
  • RSRP reference signal receive power
  • Example 39 the subject matter of any one or more of Examples 34-38 optionally include, wherein the directionality information includes an angular indication value.
  • Example 40 the subject matter of any one or more of Examples 34-39 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 41 the subject matter of any one or more of Examples 34-40 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a the plurality of discovery signals.
  • Example 43 the subject matter of any one or more of Examples 41-42 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a reference discovery signal.
  • the subject matter of any one or more of Examples 41-43 optionally include, wherein the discount is defined as progressively decreasing with increasing angular separation from the dominant discovery signal.
  • Example 45 the subject matter of any one or more of Examples 41-44 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 46 the subject matter of any one or more of Examples 34-45 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the processing circuitry to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 47 the subject matter of Example 46 optionally includes, wherein the selection criteria for candidate beam selection, when applied, cause the processing circuitry to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction wherein SU-MIMO signaling along the first beam direction and SU-MIMO signaling along the second beam direction do not mutually interfere.
  • Example 48 the subject matter of any one or more of Examples 46-47 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the processing circuitry to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 49 the subject matter of any one or more of Examples 34-48 optionally include, wherein the instructions are to further cause the UE to receive the selection criteria from an Evolved Node-B (eNB).
  • eNB Evolved Node-B
  • Example 50 is a computer-readable medium containing instructions that, when executed on processing circuitry of an Evolved Node-B (eNB) base station cause the eNB to: transmit a plurality of discovery signals carried via corresponding directional beams, each directional beam having a different angular direction; for each of the discovery signals transmit directionality information of the corresponding directional beam; and receive, from a user equipment (UE) reporting messaging that identifies a set of candidate beam directions, the candidate beam directions having been determined by the UE from among the directional beams according to selection criteria that apply preferential weighting to beams based on a combination of measured received signal power and angular separation of beam direction
  • UE user equipment
  • Example 51 the subject matter of Example 50 optionally includes, wherein the instructions are to further cause the eNB to: to transmit spatially- multiplexed data communications for reception by the UE via a plurality of SU- MIMO layers via at least a portion of the set of candidate beam directions.
  • Example 52 the subject matter of any one or more of Examples 50-51 optionally include, wherein each one of the directional beams of the plurality of discovery signals overlaps with at least one other directional beam.
  • Example 53 the subject matter of any one or more of Examples 50-52 optionally include, wherein the discovery signals include channel-state information (CSI) reference signals.
  • the discovery signals include channel-state information (CSI) reference signals.
  • CSI channel-state information
  • Example 54 the subject matter of any one or more of Examples 50-53 optionally include, wherein the received signal power is a reference signal receive power (RSRP) measurement.
  • RSRP reference signal receive power
  • Example 55 the subject matter of any one or more of Examples 50-54 optionally include, wherein the directionality information includes an angular indication value.
  • Example 56 the subject matter of any one or more of Examples 50-55 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 57 the subject matter of any one or more of Examples 50-56 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a the plurality of discovery signals.
  • Example 58 the subject matter of Example 57 optionally includes, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a cluster of received discovery signals.
  • the subject matter of any one or more of Examples 57-58 optionally include, wherein the discount is defined as progressively decreasing with increasing angular separation from the dominant discovery signal.
  • Example 60 the subject matter of any one or more of Examples 57-59 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 61 the subject matter of Example 60 optionally includes, wherein the selection criteria for candidate beam selection, when applied, cause the UE to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 62 the subject matter of Example 61 optionally includes, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction wherein SU-MIMO signaling along the first beam direction and SU-MIMO signaling along the second beam direction do not mutually interfere.
  • Example 63 the subject matter of any one or more of Examples 61-62 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 65 is a method for operating User Equipment (UE) for single-user multiple input/ multiple output (SU-MIMO) operation, the method being
  • autonomously performed by the UE comprising: receiving, from an Evolved Node-B (eNB), a plurality of discovery signals carried via corresponding directional beams having various angular directions; determining received signal power measurements and directionality information of the corresponding directional beams of the discovery signals; determining a set of candidate beam directions from among the directional beams according to selection criteria that apply preferential weighting to beams based on the signal power measurements and on angular separation of beam direction ascertained from the directionality information; and transmitting, to the eNB, reporting messaging that identifies the set of candidate beam directions
  • Example 67 the subject matter of any one or more of Examples 65-66 optionally include, wherein each one of the directional beams of the plurality of discovery signals spatially overlaps with at least one other directional beam.
  • Example 69 the subject matter of any one or more of Examples 65-68 optionally include, wherein the received signal power measurement is a reference signal receive power (RSRP) measurement.
  • RSRP reference signal receive power
  • Example 70 the subject matter of any one or more of Examples 65-69 optionally include, wherein the directionality information includes an angular indication value.
  • Example 71 the subject matter of any one or more of Examples 65-70 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 73 the subject matter of Example 72 optionally includes, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 74 the subject matter of any one or more of Examples 72-73 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a reference discovery signal.
  • Example 75 the subject matter of any one or more of Examples 72-74 optionally include, wherein the discount is defined as progressively decreasing with increasing angular separation from the dominant discovery signal.
  • Example 76 the subject matter of any one or more of Examples 72-75 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 77 the subject matter of any one or more of Examples 65-76 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 78 the subject matter of Example 77 optionally includes, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction wherein SU-MIMO signaling along the first beam direction and SU-MIMO signaling along the second beam direction do not mutually interfere.
  • Example 79 the subject matter of any one or more of Examples 77-78 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 80 the subject matter of any one or more of Examples 65-79 optionally include, further comprising: receiving the selection criteria from an Evolved Node-B (eNB).
  • Example 81 is a method for operating an Evolved Node-B (eNB) base station for single-user multiple input/ multiple output (SU-MIMO) operation, the method being autonomously performed by the eNB, and comprising: transmitting a plurality of discovery signals carried via corresponding directional beams, each directional beam having a different angular direction; for each of the discovery signals, transmitting directionality information of the corresponding directional beam; and receiving, from a user equipment (UE) reporting messaging that identifies a set of candidate beam directions, the candidate beam directions having been determined by the UE from among the directional beams according to selection criteria that apply preferential weighting to beams based on a combination of measured received signal power and angular separation of beam direction
  • UE user equipment
  • Example 82 the subject matter of Example 81 optionally includes, further comprising: transmitting spatially-multiplexed data communications for reception by the UE via a plurality of SU-MIMO layers via at least a portion of the set of candidate beam directions.
  • Example 83 the subject matter of any one or more of Examples 81-82 optionally include, wherein each one of the directional beams of the plurality of discovery signals overlaps with at least one other directional beam.
  • Example 84 the subject matter of any one or more of Examples 81-83 optionally include, wherein the discovery signals include channel-state information (CSI) reference signals.
  • the discovery signals include channel-state information (CSI) reference signals.
  • CSI channel-state information
  • Example 85 the subject matter of any one or more of Examples 81-84 optionally include, wherein the received signal power is a reference signal receive power (RSRP) measurement.
  • RSRP reference signal receive power
  • Example 86 the subject matter of any one or more of Examples 81-85 optionally include, wherein the directionality information includes an angular indication value.
  • Example 87 the subject matter of any one or more of Examples 81-86 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 88 the subject matter of any one or more of Examples 81-87 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a the plurality of discovery signals.
  • Example 89 the subject matter of Example 88 optionally includes, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 91 the subject matter of any one or more of Examples 88-90 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 92 the subject matter of any one or more of Examples 81-91 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 93 the subject matter of Example 92 optionally includes, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction wherein SU-MIMO signaling along the first beam direction and SU-MIMO signaling along the second beam direction do not mutually interfere.
  • Example 94 the subject matter of any one or more of Examples 92-93 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 95 the subject matter of any one or more of Examples 81-94 optionally include, further comprising: transmitting the selection criteria to a UE.
  • Example 96 is user Equipment (UE) for single-user multiple input/ multiple output (SU-MIMO) operation, the UE comprising: means for receiving, from an Evolved Node-B (eNB), a plurality of discovery signals carried via corresponding directional beams having various angular directions; means for determining received signal power measurements and directionality information of the corresponding directional beams of the discovery signals; means for determining a set of candidate beam directions from among the directional beams according to selection criteria that apply preferential weighting to beams based on the signal power measurements and on angular separation of beam direction ascertained from the directionality information; and means for transmitting, to the eNB, reporting messaging that identifies the set of candidate beam directions
  • eNB Evolved Node-B
  • Example 97 the subject matter of Example 96 optionally includes, further comprising: means for controlling, from the Evolved Node-B (eNB), spatially-multiplexed data communications via a plurality of SU-MIMO layers transmitted via at least a portion of the set of candidate beam directions.
  • eNB Evolved Node-B
  • Example 98 the subject matter of any one or more of Examples 96-97 optionally include, wherein each one of the directional beams of the plurality of discovery signals spatially overlaps with at least one other directional beam.
  • Example 99 the subject matter of any one or more of Examples 96-98 optionally include, wherein the discovery signals include channel-state information (CSI) reference signals.
  • the discovery signals include channel-state information (CSI) reference signals.
  • CSI channel-state information
  • Example 100 the subject matter of any one or more of Examples 96-99 optionally include, wherein the received signal power measurement is a reference signal receive power (RSRP) measurement.
  • RSRP reference signal receive power
  • Example 101 the subject matter of any one or more of Examples 96-100 optionally include, wherein the directionality information includes an angular indication value.
  • Example 102 the subject matter of any one or more of Examples 96-101 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 103 the subject matter of any one or more of Examples 96-102 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a the plurality of discovery signals.
  • Example 104 the subject matter of Example 103 optionally includes, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 105 the subject matter of any one or more of Examples 103- 104 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a reference discovery signal.
  • Example 106 the subject matter of any one or more of Examples 103— 105 optionally include, wherein the discount is defined as progressively decreasing with increasing angular separation from the dominant discovery signal.
  • Example 107 the subject matter of any one or more of Examples 103— 106 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 108 the subject matter of any one or more of Examples 96-107 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 109 the subject matter of Example 108 optionally includes, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction wherein SU-MIMO signaling along the first beam direction and SU-MIMO signaling along the second beam direction do not mutually interfere.
  • Example 1 10 the subject matter of any one or more of Examples 108- 109 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 1 1 1 the subject matter of any one or more of Examples 96-110 optionally include, further comprising: means for receiving the selection criteria from an Evolved Node-B (eNB).
  • eNB Evolved Node-B
  • Example 1 12 is a Evolved Node-B (eNB) base station for single-user multiple input/ multiple output (SU-MIMO) operation, the eNB comprising: means for transmitting a plurality of discovery signals carried via corresponding directional beams, each directional beam having a different angular direction; means for transmitting directionality information of the corresponding directional beam for each of the discovery signals; and means for receiving, from a user equipment (UE) reporting messaging that identifies a set of candidate beam directions, the candidate beam directions having been determined by the UE from among the directional beams according to selection criteria that apply preferential weighting to beams based on a combination of measured received signal power and angular separation of beam direction
  • UE user equipment
  • Example 1 13 the subject matter of Example 1 12 optionally includes, further comprising: means for transmitting spatially-multiplexed data
  • Example 1 the subject matter of any one or more of Examples 1 12-
  • each one of the directional beams of the plurality of discovery signals overlaps with at least one other directional beam.
  • Example 1 the subject matter of any one or more of Examples 1 12-
  • the discovery signals include channel-state information (CSI) reference signals.
  • CSI channel-state information
  • Example 1 16 the subject matter of any one or more of Examples 1 12-
  • 1 15 optionally include, wherein the received signal power is a reference signal receive power (RSRP) measurement.
  • RSRP reference signal receive power
  • Example 1 17 the subject matter of any one or more of Examples 1 12-
  • Example 1 16 optionally include, wherein the directionality information includes an angular indication value.
  • Example 1 18 the subject matter of any one or more of Examples 1 12- 1 17 optionally include, wherein the directionality information includes an index value associated with a direction.
  • Example 1 19 the subject matter of any one or more of Examples 1 12- 1 18 optionally include, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a the plurality of discovery signals.
  • Example 120 the subject matter of Example 1 19 optionally includes, wherein the selection criteria for candidate beam selection define application of a discount to the received signal power measurement of each of the discovery signals based on an angular orientation of each discovery signal relative to a dominant discovery signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 121 the subject matter of any one or more of Examples 1 19- 120 optionally include, wherein the discount is defined as progressively decreasing with increasing angular separation from the dominant discovery signal.
  • Example 122 the subject matter of any one or more of Examples 1 19- 121 optionally include, wherein the selection criteria for candidate beam selection define a limit on a quantity of N candidate beams to be reported, and wherein the reporting messaging includes the N candidate beams having the greatest signal power measurements following application of the discount to each of the discovery signals.
  • Example 123 the subject matter of any one or more of Examples 1 12- 122 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to select a first candidate beam direction to match a beam direction of a reference signal having a greatest signal power measurement among a cluster of received discovery signals.
  • Example 124 the subject matter of any one or more of Examples 108— 123 optionally include, wherein the selection criteria for candidate beam selection, when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction wherein SU-MIMO signaling along the first beam direction and SU-MIMO signaling along the second beam direction do not mutually interfere.
  • Example 125 the subject matter of any one or more of Examples 123—
  • the selection criteria for candidate beam selection when applied, cause the UE to further select a second candidate beam direction having a beam direction that is angularly offset from the first candidate beam direction according to predefined offsetting criteria.
  • Example 126 the subject matter of any one or more of Examples 1 12-
  • 125 optionally include, further comprising: means for transmitting the selection criteria to a UE.
PCT/RU2015/000904 2015-12-21 2015-12-21 Beam discovery reporting for spatial multiplexing WO2017111642A1 (en)

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