WO2017192371A1 - Émission de rs (signal de référence) de csi (informations d'état de canal) avec un récepteur à ic (annulation de brouillage) de csi-rs - Google Patents

Émission de rs (signal de référence) de csi (informations d'état de canal) avec un récepteur à ic (annulation de brouillage) de csi-rs Download PDF

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Publication number
WO2017192371A1
WO2017192371A1 PCT/US2017/030010 US2017030010W WO2017192371A1 WO 2017192371 A1 WO2017192371 A1 WO 2017192371A1 US 2017030010 W US2017030010 W US 2017030010W WO 2017192371 A1 WO2017192371 A1 WO 2017192371A1
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WO
WIPO (PCT)
Prior art keywords
csi
signals
interfering
circuitry
parameters
Prior art date
Application number
PCT/US2017/030010
Other languages
English (en)
Inventor
Alexei Davydov
Gregory V. Morozov
Victor SERGEEV
Andrey Chervyakov
Dimitry BELOV
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 CN201780022359.0A priority Critical patent/CN109075825B/zh
Publication of WO2017192371A1 publication Critical patent/WO2017192371A1/fr

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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
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
    • H04J11/004—Interference mitigation or co-ordination of multi-user interference at the receiver using regenerative subtractive interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

Definitions

  • the present disclosure relates to wireless technology, and more specifically to techniques for reducing interference resulting from transmission of FD (Full
  • Elevation Beamforming/FD (Full Dimension)-MIMO Multiple Input Multiple Output
  • LTE Long Term Evolution
  • Rel-13 3GPP (Third Generation Partnership Project) Release 13
  • the Rel-13 operation of elevation beamforming/FD-MIMO is based on two types of CSI feedback schemes with: (1 ) non-precoded CSI (Channel State lnformation)-RS (Reference Signals), that is, Class A FD-MIMO; or (2) beamformed CSI-RS, that is, Class B FD- MIMO.
  • each CSI-RS AP (antenna port) of a CSI-RS resource is transmitted by the eNB (evolved Node B) without beamforming, while in Class B the beamforming on CSI-RS antenna ports are used.
  • the beamforming on CSI-RS APs provides an additional coverage advantage of Class B over Class A schemes.
  • FIG. 1 is a block diagram illustrating an example user equipment (UE) useable in connection with various aspects described herein.
  • UE user equipment
  • FIG. 2 is a diagram illustrating example components of a device that can be employed in accordance with various aspects discussed herein.
  • FIG. 3 is a diagram illustrating example interfaces of baseband circuitry that can be employed in accordance with various aspects discussed herein.
  • FIG. 4 is a diagram illustrating a normal CP (Cyclic Prefix) PRB (Physical
  • FIG. 5 is a diagram illustrating an example scenario of simultaneous transmission of CSI-RS signals using multiple beams, showing an example eNB
  • FIG. 6 is a block diagram of a system that facilitates interference cancellation of interfering CSI (Channel State lnformation)-RS (Reference Signal(s)) at a UE (User
  • FIG. 7 is a block diagram of a system employable at a BS (Base Station) that facilitates interference cancellation of interfering CSI-RS by a UE, according to various aspects described herein.
  • BS Base Station
  • FIG. 8 is a flow diagram of an example method that facilitates cancellation of interference from CSI-RS of neighboring TP(s) (Transmission Point(s)) at a UE, according to various aspects discussed herein.
  • FIG. 9 is a flow diagram of an example method employable at a BS that facilitates exchange of parameters of CSI-RS with neighboring TP(s), according to various aspects discussed herein.
  • FIG. 10 is a flow diagram of an example method that facilitates cancellation of interference from CSI-RS (e.g., Class B CSI-RS) of a serving TP at a UE, according to various aspects discussed herein.
  • CSI-RS e.g., Class B CSI-RS
  • FIG. 11 is a flow diagram of an example method employable at a BS that facilitates communication of parameters of interfering CSI-RS to served UEs, according to various aspects discussed herein.
  • a component can be a processor (e.g., a microprocessor, a controller, or other processing device), a process running on a processor, a controller, an object, an executable, a program, a storage device, a computer, a tablet PC and/or a user equipment (e.g., mobile phone, etc.) with a processing device.
  • a processor e.g., a microprocessor, a controller, or other processing device
  • a process running on a processor e.g., a microprocessor, a controller, or other processing device
  • an object running on a server and the server
  • a user equipment e.g., mobile phone, etc.
  • an application running on a server and the server can also be a component.
  • One or more components can reside within a process, and a component can be localized on one computer and/or distributed between two or more computers.
  • a set of elements or a set of other components can be described herein, in which the term "set"
  • these components can execute from various computer readable storage media having various data structures stored thereon such as with a module, for example.
  • the components can communicate via local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a component can be an apparatus with specific functionality provided by mechanical parts operated by electric or electronic circuitry, in which the electric or electronic circuitry can be operated by a software application or a firmware application executed by one or more processors.
  • the one or more processors can be internal or external to the apparatus and can execute at least a part of the software or firmware application.
  • a component can be an apparatus that provides specific functionality through electronic components without mechanical parts; the electronic components can include one or more processors therein to execute software and/or firmware that confer(s), at least in part, the functionality of the electronic components.
  • circuitry may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality.
  • 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.
  • FIG. 1 illustrates an architecture of a system 1 00 of a network in accordance with some embodiments.
  • the system 100 is shown to include a user equipment (UE) 101 and a UE 102.
  • the UEs 101 and 102 are illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks), but may also comprise any mobile or non-mobile computing device, such as Personal Data Assistants (PDAs), pagers, laptop computers, desktop computers, wireless handsets, or any computing device including a wireless communications interface.
  • PDAs Personal Data Assistants
  • pagers pagers
  • laptop computers desktop computers
  • wireless handsets or any computing device including a wireless communications interface.
  • any of the UEs 101 and 102 can comprise an Internet of Things (loT) UE, which can comprise a network access layer designed for low-power loT applications utilizing short-lived UE connections.
  • An loT UE can utilize technologies such as machine-to-machine (M2M) or machine-type communications (MTC) for exchanging data with an MTC server or device via a public land mobile network (PLMN), Proximity-Based Service (ProSe) or device-to-device (D2D) communication, sensor networks, or loT networks.
  • M2M or MTC exchange of data may be a machine-initiated exchange of data.
  • loT network describes interconnecting loT UEs, which may include uniquely identifiable embedded computing devices (within the Internet infrastructure), with short-lived connections.
  • the loT UEs may execute background applications (e.g., keep-alive messages, status updates, etc.) to facilitate the connections of the loT network.
  • the UEs 101 and 102 may be configured to connect, e.g., communicatively couple, with a radio access network (RAN) 1 10—
  • the RAN 1 10 may be, for example, an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), a NextGen RAN (NG RAN), or some other type of RAN.
  • UMTS Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • NG RAN NextGen RAN
  • the UEs 101 and 102 utilize connections 103 and 104, respectively, each of which comprises a physical communications interface or layer (discussed in further detail below); in this example, the connections 103 and 104 are illustrated as an air interface to enable communicative coupling, and can be consistent with cellular communications protocols, such as a Global System for Mobile Communications (GSM) protocol, a code-division multiple access (CDMA) network protocol, a Push-to-Talk (PTT) protocol, a PTT over Cellular (POC) protocol, a Universal Mobile Telecommunications System (UMTS) protocol, a 3GPP Long Term Evolution (LTE) protocol, a fifth generation (5G) protocol, a New Radio (NR) protocol, and the like.
  • GSM Global System for Mobile Communications
  • CDMA code-division multiple access
  • PTT Push-to-Talk
  • POC PTT over Cellular
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • 5G fifth generation
  • NR New Radio
  • the UEs 101 and 1 02 may further directly exchange communication data via a ProSe interface 105.
  • the ProSe interface 105 may
  • a sidelink interface comprising one or more logical channels, including but not limited to a Physical Sidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel (PSSCH), a Physical Sidelink Discovery Channel (PSDCH), and a Physical Sidelink Broadcast Channel (PSBCH).
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the UE 102 is shown to be configured to access an access point (AP) 106 via connection 107.
  • the connection 107 can comprise a local wireless connection, such as a connection consistent with any IEEE 802.1 1 protocol, wherein the AP 106 would comprise a wireless fidelity (WiFi®) router.
  • WiFi® wireless fidelity
  • the AP 1 06 is shown to be connected to the Internet without connecting to the core network of the wireless system (described in further detail below).
  • the RAN 1 1 0 can include one or more access nodes that enable the connections 1 03 and 104.
  • These access nodes (ANs) can be referred to as base stations (BSs), NodeBs, evolved NodeBs (eNBs), next Generation NodeBs (gNB), RAN nodes, and so forth, and can comprise ground stations (e.g., terrestrial access points) or satellite stations providing coverage within a geographic area (e.g., a cell).
  • BSs base stations
  • eNBs evolved NodeBs
  • gNB next Generation NodeBs
  • RAN nodes and so forth, and can comprise ground stations (e.g., terrestrial access points) or satellite stations providing coverage within a geographic area (e.g., a cell).
  • the RAN 1 1 0 may include one or more RAN nodes for providing macrocells, e.g., macro RAN node 1 1 1 , and one or more RAN nodes for providing femtocells or picocells (e.g., cells having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells), e.g., low power (LP) RAN node 1 12.
  • RAN nodes for providing macrocells e.g., macro RAN node 1 1 1
  • femtocells or picocells e.g., cells having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells
  • LP low power
  • any of the RAN nodes 1 1 1 and 1 12 can terminate the air interface protocol and can be the first point of contact for the UEs 101 and 102.
  • any of the RAN nodes 1 1 1 and 1 12 can fulfill various logical functions for the RAN 1 1 0 including, but not limited to, radio network controller (RNC) functions such as radio bearer management, uplink and downlink dynamic radio resource management and data packet scheduling, and mobility management.
  • RNC radio network controller
  • the UEs 101 and 102 can be configured to communicate using Orthogonal Frequency-Division Multiplexing (OFDM) communication signals with each other or with any of the RAN nodes 1 1 1 and 1 1 2 over a multicarrier communication channel in accordance various communication techniques, such as, but not limited to, an Orthogonal Frequency-Division Multiple Access (OFDMA) communication technique (e.g., for downlink communications) or a Single Carrier Frequency Division Multiple Access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink communications), although the scope of the embodiments is not limited in this respect.
  • OFDM signals can comprise a plurality of orthogonal subcarriers.
  • a downlink resource grid can be used for downlink transmissions from any of the RAN nodes 1 1 1 and 1 12 to the UEs 101 and 1 02, while uplink transmissions can utilize similar techniques.
  • the grid can 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 corresponds 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.
  • the smallest time-frequency unit in a resource grid is denoted as a resource element.
  • Each resource grid comprises a number of resource blocks, which describe the mapping of certain physical channels to resource elements.
  • Each resource block comprises a collection of resource elements; in the frequency domain, this may represent the smallest quantity of resources that currently can be allocated.
  • the physical downlink shared channel may carry user data and higher-layer signaling to the UEs 101 and 102.
  • the physical downlink control channel (PDCCH) may carry information about the transport format and resource allocations related to the PDSCH channel, among other things. It may also inform the UEs 101 and 102 about the transport format, resource allocation, and H-ARQ (Hybrid Automatic Repeat Request) information related to the uplink shared channel.
  • downlink scheduling (assigning control and shared channel resource blocks to the UE 102 within a cell) may be performed at any of the RAN nodes 1 1 1 and 1 12 based on channel quality information fed back from any of the UEs 101 and 102.
  • the downlink resource assignment information may be sent on the PDCCH used for (e.g., assigned to) each of the UEs 101 and 1 02.
  • the PDCCH may use control channel elements (CCEs) to convey the control information.
  • CCEs control channel elements
  • the PDCCH complex-valued symbols may first be organized into quadruplets, which may then be permuted using a sub-block interleaver for rate matching.
  • Each PDCCH may be transmitted using one or more of these CCEs, where each CCE may correspond to nine sets of four physical resource elements known as resource element groups (REGs).
  • RAGs resource element groups
  • QPSK Quadrature Phase Shift Keying
  • the PDCCH can be transmitted using one or more CCEs, depending on the size of the downlink control information (DCI) and the channel condition.
  • DCI downlink control information
  • There can be four or more different PDCCH formats defined in LTE with different numbers of CCEs (e.g., aggregation level, L 1 , 2, 4, or 8).
  • Some embodiments may use concepts for resource allocation for control channel information that are an extension of the above-described concepts.
  • some embodiments may utilize an enhanced physical downlink control channel (EPDCCH) that uses PDSCH resources for control information transmission.
  • the EPDCCH may be transmitted using one or more enhanced the control channel elements (ECCEs). Similar to above, each ECCE may correspond to nine sets of four physical resource elements known as an enhanced resource element groups (EREGs). An ECCE may have other numbers of EREGs in some situations.
  • EPCCH enhanced physical downlink control channel
  • ECCEs enhanced the control channel elements
  • each ECCE may correspond to nine sets of four physical resource elements known as an enhanced resource element groups (EREGs).
  • EREGs enhanced resource element groups
  • An ECCE may have other numbers of EREGs in some situations.
  • the RAN 1 1 0 is shown to be communicatively coupled to a core network (CN) 1 20— via an S1 interface 1 1 3.
  • the CN 120 may be an evolved packet core (EPC) network, a NextGen Packet Core (NPC) network, or some other type of CN.
  • EPC evolved packet core
  • NPC NextGen Packet Core
  • the S1 interface 1 13 is split into two parts: the S1 -U interface 1 14, which carries traffic data between the RAN nodes 1 1 1 and 1 12 and the serving gateway (S-GW) 122, and the S1 -mobility management entity (MME) interface 1 15, which is a signaling interface between the RAN nodes 1 1 1 and 1 12 and MMEs 121 .
  • MME mobility management entity
  • the CN 1 20 comprises the MMEs 121 , the S-GW 122, the Packet Data Network (PDN) Gateway (P-GW) 123, and a home subscriber server (HSS) 124.
  • the MMEs 121 may be similar in function to the control plane of legacy Serving General Packet Radio Service (GPRS) Support Nodes (SGSN).
  • the MMEs 121 may manage mobility aspects in access such as gateway selection and tracking area list management.
  • the HSS 124 may comprise a database for network users, including subscription-related information to support the network entities' handling of communication sessions.
  • the CN 120 may comprise one or several HSSs 124, depending on the number of mobile subscribers, on the capacity of the equipment, on the organization of the network, etc.
  • the HSS 124 can provide support for routing/roaming, authentication, authorization, naming/addressing resolution, location dependencies, etc.
  • the S-GW 122 may terminate the S1 interface 1 13 towards the RAN 1 1 0, and routes data packets between the RAN 1 10 and the CN 120.
  • the S-GW 122 may be a local mobility anchor point for inter-RAN node handovers and also may provide an anchor for inter-3GPP mobility. Other responsibilities may include lawful intercept, charging, and some policy enforcement.
  • the P-GW 123 may terminate an SGi interface toward a PDN.
  • the P-GW 123 may route data packets between the EPC network 123 and external networks such as a network including the application server 130 (alternatively referred to as application function (AF)) via an Internet Protocol (IP) interface 125.
  • the application server 130 may be an element offering applications that use IP bearer resources with the core network (e.g., UMTS Packet Services (PS) domain, LTE PS data services, etc.).
  • PS UMTS Packet Services
  • LTE PS data services etc.
  • the P-GW 123 is shown to be communicatively coupled to an application server 130 via an IP communications interface 125.
  • the application server 130 can also be configured to support one or more communication services (e.g., Voice-over-Internet Protocol (VoIP) sessions, PTT sessions, group communication sessions, social networking services, etc.) for the UEs 101 and 102 via the CN 120.
  • VoIP Voice-over-Internet Protocol
  • PTT sessions PTT sessions
  • group communication sessions social networking services, etc.
  • the P-GW 123 may further be a node for policy enforcement and charging data collection.
  • Policy and Charging Enforcement Function (PCRF) 126 is the policy and charging control element of the CN 120.
  • PCRF Policy and Charging Enforcement Function
  • HPLMN Home Public Land Mobile Network
  • IP-CAN Internet Protocol Connectivity Access Network
  • HPLMN Home Public Land Mobile Network
  • V-PCRF Visited PCRF
  • VPLMN Visited Public Land Mobile Network
  • the PCRF 126 may be communicatively coupled to the application server 130 via the P-GW 123.
  • the application server 130 may signal the PCRF 126 to indicate a new service flow and select the appropriate Quality of Service (QoS) and charging parameters.
  • the PCRF 126 may provision this rule into a Policy and Charging Enforcement Function (PCEF) (not shown) with the appropriate traffic flow template (TFT) and QoS class of identifier (QCI), which commences the QoS and charging as specified by the application server 130.
  • PCEF Policy and Charging Enforcement Function
  • TFT traffic flow template
  • QCI QoS class of identifier
  • FIG. 2 illustrates example components of a device 200 in accordance with some embodiments.
  • the device 200 may include application circuitry 202, baseband circuitry 204, Radio Frequency (RF) circuitry 206, front-end module (FEM) circuitry 208, one or more antennas 21 0, and power management circuitry (PMC) 21 2 coupled together at least as shown.
  • the components of the illustrated device 200 may be included in a UE or a RAN node.
  • the device 200 may include less elements (e.g., a RAN node may not utilize application circuitry 202, and instead include a processor/controller to process IP data received from an EPC).
  • the device 200 may include additional elements such as, for example, memory/storage, display, camera, sensor, or input/output (I/O) interface.
  • the components described below may be included in more than one device (e.g., said circuitries may be separately included in more than one device for Cloud-RAN (C-RAN) implementations).
  • C-RAN Cloud-RAN
  • 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 device 200.
  • processors of application circuitry 202 may process IP data packets received from an EPC.
  • 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.
  • the baseband circuitry 204 may include a third generation (3G) baseband processor 204A, a fourth generation (4G) baseband processor 204B, a fifth generation (5G) baseband processor 204C, or other baseband processor(s) 204D for other existing generations, generations in development or to be developed in the future (e.g., second generation (2G), sixth generation (6G), etc.).
  • the baseband circuitry 204 e.g., one or more of baseband processors 204A-D
  • baseband processors 204A-D may be included in modules stored in the memory 204G and executed via a Central Processing Unit (CPU) 204E.
  • the radio control functions may include, but are not limited to, signal modulation/demodulation, encoding/decoding, radio frequency shifting, etc.
  • modulation/demodulation circuitry of the baseband circuitry 204 may include Fast-Fourier Transform (FFT), precoding, or constellation mapping/demapping functionality.
  • FFT Fast-Fourier Transform
  • 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.
  • LDPC Low Density Parity Check
  • the baseband circuitry 204 may include one or more audio digital signal processor(s) (DSP) 204F.
  • 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.
  • RF circuitry 206 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium.
  • the RF circuitry 206 may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network.
  • RF circuitry 206 may include a receive signal path which may include circuitry to down-convert RF signals received from the FEM circuitry 208 and provide baseband signals to the baseband circuitry 204.
  • RF circuitry 206 may also include a transmit signal path which may include circuitry to up-convert baseband signals provided by the baseband circuitry 204 and provide RF output signals to the FEM circuitry 208 for transmission.
  • 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 bandpass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals.
  • Output baseband signals may be provided to the baseband circuitry 204 for further processing.
  • the output baseband signals may be zero-frequency baseband signals, although this is not a requirement.
  • mixer circuitry 206a of the receive signal path may comprise passive mixers, although the scope of the embodiments is not limited in this respect.
  • the mixer circuitry 206a of the transmit signal path may be configured to up-convert input baseband signals based on the synthesized frequency provided by the synthesizer circuitry 206d to generate RF output signals for the FEM circuitry 208.
  • the baseband signals may be provided by the baseband circuitry 204 and may be filtered by filter circuitry 206c.
  • 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 and 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 and 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
  • the synthesizer circuitry 206d may be a fractional-N synthesizer or a fractional N/N+1 synthesizer, although the scope of the embodiments is not limited in this respect as other types of frequency synthesizers may be suitable.
  • 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+1 synthesizer.
  • frequency input may be provided by a voltage controlled oscillator (VCO), although that is not a requirement.
  • VCO voltage controlled oscillator
  • Divider control input may be provided by either the baseband circuitry 204 or the applications processor 202 depending on the desired output frequency.
  • a divider control input (e.g., N) may be determined from a look-up table based on a channel indicated by the applications processor 202.
  • 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 (DPA).
  • 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.
  • the delay elements may be configured to break a VCO period up into Nd equal packets of phase, where Nd is the number of delay elements in the delay line.
  • Nd is the number of delay elements in the delay line.
  • 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 (fLO).
  • 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 21 0.
  • the amplification through the transmit or receive signal paths may be done solely in the RF circuitry 206, solely in the FEM 208, or in both the RF circuitry 206 and the FEM 208.
  • 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 an LNA to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to the RF circuitry 206).
  • the transmit signal path of the FEM circuitry 208 may include a power amplifier (PA) to amplify input RF signals (e.g., provided by RF circuitry 206), and one or more filters to generate RF signals for subsequent transmission (e.g., by one or more of the one or more antennas 210).
  • PA power amplifier
  • the PMC 212 may manage power provided to the baseband circuitry 204.
  • the PMC 212 may control power-source selection, voltage scaling, battery charging, or DC-to-DC conversion.
  • the PMC 212 may often be included when the device 200 is capable of being powered by a battery, for example, when the device is included in a UE.
  • the PMC 21 2 may increase the power conversion efficiency while providing desirable implementation size and heat dissipation
  • FIG. 2 shows the PMC 212 coupled only with the baseband circuitry 204.
  • the PMC 2 12 may be additionally or alternatively coupled with, and perform similar power management operations for, other components such as, but not limited to, application circuitry 202, RF circuitry 206, or FEM 208.
  • the PMC 212 may control, or otherwise be part of, various power saving mechanisms of the device 200. For example, if the device 200 is in an RRC_Connected state, where it is still connected to the RAN node as it expects to receive traffic shortly, then it may enter a state known as Discontinuous Reception Mode (DRX) after a period of inactivity. During this state, the device 200 may power down for brief intervals of time and thus save power.
  • DRX Discontinuous Reception Mode
  • the device 200 may transition off to an RRCJdle state, where it disconnects from the network and does not perform operations such as channel quality feedback, handover, etc.
  • the device 200 goes into a very low power state and it performs paging where again it periodically wakes up to listen to the network and then powers down again.
  • the device 200 may not receive data in this state, in order to receive data, it must transition back to RRC_Connected state.
  • An additional power saving mode may allow a device to be unavailable to the network for periods longer than a paging interval (ranging from seconds to a few hours). During this time, the device is totally unreachable to the network and may power down completely. Any data sent during this time incurs a large delay and it is assumed the delay is acceptable.
  • Processors of the application circuitry 202 and processors of the baseband circuitry 204 may be used to execute elements of one or more instances of a protocol stack.
  • processors of the baseband circuitry 204 may be used execute Layer 3, Layer 2, or Layer 1 functionality, while processors of the application circuitry 204 may utilize data (e.g., packet data) received from these layers and further execute Layer 4 functionality (e.g., transmission communication protocol (TCP) and user datagram protocol (UDP) layers).
  • Layer 3 may comprise a radio resource control (RRC) layer, described in further detail below.
  • RRC radio resource control
  • Layer 2 may comprise a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer, described in further detail below.
  • Layer 1 may comprise a physical (PHY) layer of a UE/RAN node, described in further detail below.
  • FIG. 3 illustrates example interfaces of baseband circuitry in accordance with some embodiments.
  • the baseband circuitry 204 of FIG. 2 may comprise processors 204A-204E and a memory 204G utilized by said processors.
  • Each of the processors 204A-204E may include a memory interface, 304A-304E,
  • the baseband circuitry 204 may further include one or more interfaces to communicatively couple to other circuitries/devices, such as a memory interface 312 (e.g., an interface to send/receive data to/from memory external to the baseband circuitry 204), an application circuitry interface 314 (e.g., an interface to send/receive data to/from the application circuitry 202 of FIG. 2), an RF circuitry interface 316 (e.g., an interface to send/receive data to/from RF circuitry 206 of FIG.
  • a memory interface 312 e.g., an interface to send/receive data to/from memory external to the baseband circuitry 204
  • an application circuitry interface 314 e.g., an interface to send/receive data to/from the application circuitry 202 of FIG. 2
  • an RF circuitry interface 316 e.g., an interface to send/receive data to/from RF circuitry 206 of FIG.
  • a wireless hardware connectivity interface 31 8 e.g., an interface to send/receive data to/from Near Field Communication (NFC) components, Bluetooth® components (e.g., Bluetooth® Low Energy), Wi-Fi® components, and other communication components
  • a power management interface 320 e.g., an interface to send/receive power or control signals to/from the PMC 212).
  • device 300 is in the context of a UE device, in various aspects, a similar device can be employed in connection with a base station (BS) such as an Evolved NodeB (eNB), etc.
  • BS base station
  • eNB Evolved NodeB
  • NZP Non-Zero Power
  • CSI Channel State lnformation
  • REs Resource Elements
  • PRB Physical Resource Block
  • the number of REs used for Rel-14 NZP CSI-RS in the PRB may be increased to 32 REs.
  • NZP CSI-RS uses the same signal for modulation of the all antenna ports.
  • highly correlated interfering channels e.g. corresponding to LOS (Line of Sight) propagation
  • the interference from NZP CSI- RS transmission may be correlated in a given PRB. Therefore, the impact of CSI-RS transmission with 32 antenna ports on PDSCH performance (and possibly colliding CSI- RS) of neighboring TPs could be more significant.
  • FIG. 4 illustrated is a diagram of a normal CP (Cyclic Prefix) PRB (Physical Resource Block) showing the REs that can be used for Class A NZP CSI-RS transmission in connection with various aspects discussed herein.
  • CSI-RS can be transmitted to multiple UEs on the same time and frequency resources using different beamforming. Transmission of CSI- RS signals on the same REs (resource elements) increases the spectral efficiency due to spatial reuse of time and frequency resources. However, in addition to increased spectral efficiency, increased interference on the serving CSI-RS and/or PDSCH (Physical Downlink Shared CHannel) received from the same TPs (Transmission Points) can also result. Referring to FIG.
  • higher layer signaling can be employed to indicate one or more parameters of CSI-RS transmitted by one or more neighboring transmission points (TPs).
  • the parameter(s) of the CSI-RS can be used by a UE for interference cancellation from the CSI-RS colliding with PDSCH or CSI-RS transmitted by the serving transmission points.
  • X2 signaling can be used to exchange information between neighboring eNBs about the CSI-RS signals transmitted by each TP.
  • multiple CSI-RS signals (e.g., associated with antenna ports of one CSI-RS resource or different CSI-RS configurations) can be transmitted from the same serving TP using different
  • Interfering CSI-RS interfering CSI-RS
  • Higher layer signaling can be employed to indicate parameter(s) of the interfering CSI- RS signals to the UE.
  • the CSI-RS parameter(s) can be used by the UE for interference cancellation on PDSCH and/or CSI-RS transmitted by the serving transmission point.
  • System 600 can include one or more processors 61 0 (e.g., one or more baseband processors such as one or more of the baseband processors discussed in connection with FIG. 2 and/or FIG. 3) comprising processing circuitry and associated memory interface(s) (e.g., memory interface(s) discussed in connection with FIG.
  • processors 61 0 e.g., one or more baseband processors such as one or more of the baseband processors discussed in connection with FIG. 2 and/or FIG. 3
  • processing circuitry and associated memory interface(s) e.g., memory interface(s) discussed in connection with FIG.
  • transceiver circuitry 620 e.g., comprising one or more of transmitter circuitry or receiver circuitry, which can employ common circuit elements, distinct circuit elements, or a combination thereof
  • memory 630 which can comprise any of a variety of storage mediums and can store instructions and/or data associated with one or more of processor(s) 610 or transceiver circuitry 620.
  • system 600 can be included within a user equipment (UE). As described in greater detail below, system 600 can facilitate cancellation of Class A or Class B CSI-RS interfering with received PDSCH (Physical Downlink Shared CHannel) and/or CSI-RS.
  • PDSCH Physical Downlink Shared CHannel
  • System 700 can include one or more processors 710 (e.g., one or more baseband processors such as one or more of the baseband processors discussed in connection with FIG. 2 and/or FIG. 3) comprising processing circuitry and associated memory interface(s) (e.g., memory interface(s) discussed in connection with FIG.
  • processors 710 e.g., one or more baseband processors such as one or more of the baseband processors discussed in connection with FIG. 2 and/or FIG. 3
  • processing circuitry and associated memory interface(s) e.g., memory interface(s) discussed in connection with FIG.
  • communication circuitry 720 e.g., which can comprise circuitry for one or more wired (e.g., X2, etc.) connections and/or transceiver circuitry that can comprise one or more of transmitter circuitry (e.g., associated with one or more transmit chains) or receiver circuitry (e.g., associated with one or more receive chains), wherein the transmitter circuitry and receiver circuitry can employ common circuit elements, distinct circuit elements, or a combination thereof), and memory 730 (which can comprise any of a variety of storage mediums and can store instructions and/or data associated with one or more of processor(s) 710 or communication circuitry 720).
  • wired e.g., X2, etc.
  • system 700 can be included within an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (Evolved Node B, eNodeB, or eNB) or other base station in a wireless communications network.
  • the processor(s) 71 0, communication circuitry 720, and the memory 730 can be included in a single device, while in other aspects, they can be included in different devices, such as part of a distributed architecture.
  • system 700 can facilitate UE interfere cancellation via one or more of sending (e.g., via an X2 protocol) parameters associated with CSI-RS signaling to a neighboring TP (Transmission Point), receiving parameters from at least one
  • sending e.g., via an X2 protocol
  • CSI-RS Signaling
  • TP Transmission Point
  • a neighboring TP associated with CSI-RS signaling from the at least one neighboring TP, or transmitting to a UE parameters of CSI-RS (e.g., from a neighboring TP and/or associated with a non-serving CSI-RS resource from the BS employing system 700 (e.g., a CSI-RS resource other than serving CSI-RS resource(s) for the UE).
  • a UE parameters of CSI-RS e.g., from a neighboring TP and/or associated with a non-serving CSI-RS resource from the BS employing system 700 (e.g., a CSI-RS resource other than serving CSI-RS resource(s) for the UE).
  • a serving TP can transmit (e.g., via communication circuitry 720) and UEs may receive (e.g., via transceiver circuitry 620) and process (e.g., via processor(s) 610) parameters (e.g., in a message generated by processor(s) 710) of the NZP (Non-Zero Power) CSI- RS resource(s) transmitted by the neighboring transmission point(s).
  • NZP Non-Zero Power
  • the parameters can be provided to the UE using higher layer signaling (e.g., RRC, etc., generated by processor(s) 710 and transmitted via communication circuitry 720) and can comprise one or more of the following information elements: (a) type of CSI-RS signal (e.g., Class A or Class B); (b) the number of NZP CSI-RS resource antenna ports (e.g., 12, 16, 20, 24, 28, 32, etc.); (c) subframe configuration indicating the periodicity and offset in the downlink subframes for CSI-RS transmission; (d) one or more CSI-RS configurations of the NZP CSI-RS resource; (e) scrambling identity used for generating sequence for modulations of NZP CSI-RS antenna port signals; (f) CDM (Code Division Multiplexing) type (e.g., 2, 4, or 8); and/or (g) optionally physical cell ID and/or number of CRS ports of the transmission point transmitting the CSI-RS.
  • RRC Radio Resource Control
  • the type of CSI-RS signal and the number of NZP CSI-RS resource antenna ports can be indicated together, for example, wherein more than 8 APs can indicate Class A CSI-RS and 8 or less APs can indicate Class B CSI-RS.
  • a UE After receiving (e.g., via higher layer signaling generated by processor(s) 710, transmitted via communication circuitry 720, and received via transceiver circuitry 620) the parameters describing NZP CSI-RS resource(s) of the neighboring TP(s), a UE can perform channel estimation (e.g., via processor(s) 610) corresponding to the antenna ports of the interfering CSI-RS signal(s) of the neighboring TPs and reconstruction (e.g., by processor(s) 61 0) of the received interfering CSI-RS signal(s) (e.g., received via transceiver circuitry 620 from the neighboring TP(s)).
  • processing e.g., by processor(s) 610, processor(s) 710, etc.
  • processing can comprise one or more of: identifying physical resources associated with the
  • the reconstructed CSI-RS signal can be employed at the UE (e.g., by processor(s) 610) to cancel or suppress interference from the CSI-RS signals on the received serving PDSCH or CSI-RS transmitted by the serving TP (e.g., received by transceiver circuitry 620).
  • the cancellation or suppression can be accomplished by subtracting (e.g., by processor(s) 610) the reconstructed version of the received CSI-RS signal(s) of the neighboring TP(s) from the received signal (e.g., serving PDSCH or CSI-RS transmitted by the serving TP).
  • a machine readable medium can store instructions associated with method 800 that, when executed, can cause a UE to perform the acts of method 800.
  • a UE can receive (e.g., via transceiver circuitry 620) from a serving TP configuration parameters (e.g., generated by processor(s) 710 and transmitted (e.g., via higher layer signaling) by communication circuitry 720) of one or more interfering NZP CSI-RS resources corresponding to one or more neighboring TPs.
  • a serving TP configuration parameters e.g., generated by processor(s) 710 and transmitted (e.g., via higher layer signaling) by communication circuitry 720.
  • the UE can perform processing (e.g., via processor(s) 610) of the interfering NZP CSI-RS resource(s) using the received signal (e.g., the combined signal received at transceiver circuitry 620, comprising both the interfering NZP CSI-RS and a serving PDSCH or CSI-RS) and the received NZP CSI-RS resource parameters.
  • the received signal e.g., the combined signal received at transceiver circuitry 620, comprising both the interfering NZP CSI-RS and a serving PDSCH or CSI-RS
  • the UE e.g., via processor(s) 61 0
  • the UE can cancel or suppress
  • NZP CSI-RS transmitted (e.g., via communication circuitry 720) by the serving TP (e.g., and received via transceiver circuitry 620) using the processed interfering NZP CSI-RS signals.
  • method 800 can include one or more other acts described herein in connection with system 600.
  • a TP can employ X2 signaling to exchange information with neighboring TPs about the CSI-RS signals (e.g., various parameters discussed herein, etc.) transmitted by the TP and the neighboring TPs.
  • the exchanged information can be used to assist the serving UEs about parameters of the CSI-RS of interfering TPs.
  • FIG. 9 illustrated is a flow diagram of an example method 900 employable at a BS that facilitates exchange of parameters of CSI-RS with neighboring TP(s), according to various aspects discussed herein.
  • a machine readable medium can store instructions associated with method 900 that, when executed, can cause a BS to perform the acts of method 900.
  • CSI-RS signals (e.g., generated by processor(s) 710) can be transmitted (e.g., via communication circuitry 720) to one or more UEs (e.g., which can receive the CSI-RS via transceiver circuitry 620 and process the CSI-RS via
  • outputting for transmission can comprise one or more of the following: generating a set of associated bits that indicate the content of the signal or message, coding (e.g., which can include adding a cyclic redundancy check (CRC) and/or coding via one or more of turbo code, low density parity-check (LDPC) code, tailbiting convolution code (TBCC), etc.), scrambling (e.g., based on a scrambling seed), modulating (e.g., via one of binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), or some form of quadrature amplitude modulation (QAM), etc.), and/or resource mapping (e.g., to a scheduled set of resources, to a set of time and frequency resources granted for uplink transmission, etc.).
  • coding e.g., which can include adding a cyclic redundancy check (CRC) and/or coding via one or more of turbo code, low density parity-check (LDPC) code, tail
  • one or more neighboring BSs can be informed about the transmitted CSI-RS (e.g., via a message indicating one or more CSI-RS parameters discussed herein) via X2 protocol signaling, such as in one or more X2 messages generated by processor(s) 710 and sent via communication circuitry 720.
  • X2 protocol signaling such as in one or more X2 messages generated by processor(s) 710 and sent via communication circuitry 720.
  • method 900 can include one or more other acts described herein in connection with system 700.
  • multiple CSI-RS signals can be transmitted by the serving TP using the same REs (Resource Elements).
  • the transmitted CSI-RS signals can correspond to different beamforming at the serving TP.
  • Some CSI-RS signals can correspond to the serving beam(s) on which channel for CSI can be derived at the UE, while the other beam(s) can correspond to the interfering beams (interfering CSI-RS) which can be transmitted to other UEs.
  • Higher layer signaling e.g. RRC, etc.
  • RRC Radio Resource Control
  • parameters that can be indicated comprise: (a) type of CSI-RS signal (e.g., Class A or Class B); (b) the number of NZP CSI-RS resource antenna ports (e.g., 1 , 2, 4, or 8, etc.); (c) subframe configuration indicating the periodicity and offset in the downlink subframes for CSI-RS transmission; (d) one or more CSI-RS configurations of the NZP CSI-RS resource; (e) scrambling identity used for generating sequence for modulations of NZP CSI-RS antenna port signals; and/or (f) CDM (Code Division Multiplexing) type (e.g., 2, 4, or 8).
  • type of CSI-RS signal e.g., Class A or Class B
  • the number of NZP CSI-RS resource antenna ports e.g., 1 , 2, 4, or 8, etc.
  • subframe configuration indicating the periodicity and offset in the downlink subframes for CSI-RS transmission
  • the type of CSI-RS signal and the number of NZP CSI-RS resource antenna ports can be indicated together, for example, wherein more than 8 APs can indicate Class A CSI-RS and 8 or less APs can indicate Class B CSI- RS.
  • a UE After receiving (e.g., via communication circuitry 620) the parameters describing interfering CSI-RS signals of the serving TP, a UE can perform channel estimation (e.g., via processor(s) 610) corresponding to the antenna ports of the interfering CSI-RS and can reconstruct (e.g., via processor(s) 610) the received interfering CSI-RS signals.
  • the reconstructed signals can be used to cancel or suppress interference on the served PDSCH or CSI-RS signals (e.g., via processor(s) 61 0).
  • the cancellation or suppression can be accomplished by subtracting from the received signal the reconstructed interfering CSI-RS signals corresponding to interfering beams (e.g., via processor(s) 610).
  • a machine readable medium can store instructions associated with method 1000 that, when executed, can cause a UE to perform the acts of method 1000.
  • a UE can receive (e.g., via transceiver circuitry 620), from a serving TP, configuration parameters (e.g., generated by processor(s) 710 and transmitted (e.g., via higher layer signaling) by communication circuitry 720) of one or more interfering NZP CSI-RS resources (e.g., Class B) corresponding to the serving TP.
  • configuration parameters e.g., generated by processor(s) 710 and transmitted (e.g., via higher layer signaling) by communication circuitry 720
  • interfering NZP CSI-RS resources e.g., Class B
  • the UE can perform processing (e.g., via processor(s) 610) of the interfering NZP CSI-RS resource(s) using the received signal (e.g., the combined signal received at transceiver circuitry 620, comprising both the interfering NZP CSI-RS and a serving PDSCH or CSI-RS) and the received NZP CSI-RS resource parameters.
  • the received signal e.g., the combined signal received at transceiver circuitry 620, comprising both the interfering NZP CSI-RS and a serving PDSCH or CSI-RS
  • the UE can cancel or suppress interference on the PDSCH or NZP CSI-RS transmitted (e.g., via communication circuitry 720) by the serving TP (e.g., and received via transceiver circuitry 620) using the processed interfering NZP CSI-RS signals.
  • method 1000 can include one or more other acts described herein in connection with system 600.
  • a UE need not perform PDSCH REs mapping (e.g., by processor(s) 61 0) around all configured interfering CSI-RS signals.
  • the set of CSI-RS signals around which PDSCH REs mapping is to be performed (e.g., by processor(s) 610) can be indicated to the UE using DCI signaling (e.g., generated by processor(s) 71 0, sent via communication circuitry 720, received via communication circuitry 620, and processed via processor(s) 610).
  • an N e.g., 2 bit field can be used in DCI (e.g., similar to PDSCH RE mapping and QCL (Quasi Co-Location) to indicate a CSI-RS set among up to 2 N (e.g., 4) sets, wherein the indicated CSI-RS set is to be used for determination of the PDSCH REs mapping (e.g., by processor(s) 61 0).
  • DCI e.g., similar to PDSCH RE mapping and QCL (Quasi Co-Location) to indicate a CSI-RS set among up to 2 N (e.g., 4) sets, wherein the indicated CSI-RS set is to be used for determination of the PDSCH REs mapping (e.g., by processor(s) 61 0).
  • a machine readable medium can store instructions associated with method 1 100 that, when executed, can cause a BS to perform the acts of method 1 100.
  • one or more neighboring BSs can be informed (e.g., via X2 messaging generated by processor(s) 71 0 and sent via communication circuitry 720) about one or more parameters of CSI-RS signals (e.g., Class A CSI-RS generated by processor(s) 710) transmitted or to be transmitted (e.g., via communication circuitry 720) to one or more UEs.
  • CSI-RS signals e.g., Class A CSI-RS generated by processor(s) 710
  • one or more X2 messages can be received (e.g., via communication circuitry 720, and processed via processor(s) 710) from one or more TPs that indicates parameters of CSI-RS signaling transmitted by those TP(s).
  • one or more UEs served by a BS employing method 1 100 can be informed (e.g., via higher layer (e.g., RRC) signaling generated by processor(s) 710 and sent via communication circuitry 720) about parameters of interfering CSI-RS (e.g., interfering with CSI-RS and/or PDSCH scheduled for or transmitted to those UE(s)).
  • the interfering CSI-RS can be Class A CSI-RS transmitted by neighboring TPs (e.g., in embodiments wherein 1 1 10 and/or 1 1 20 are performed), Class B CSI-RS transmitted to other UE(s) by the BS employing method 1 100, or a combination thereof.
  • signaling e.g., CSI-RS, PDSCH, etc.
  • REs that are also employed for transmission
  • method 1 100 can include one or more other acts described herein in connection with system 700.
  • Examples herein can include subject matter such as a method, means for performing acts or blocks of the method, at least one machine-readable medium including executable instructions that, when performed by a machine (e.g., a processor with memory, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or the like) cause the machine to perform acts of the method or of an apparatus or system for concurrent communication using multiple communication technologies according to embodiments and examples described.
  • a machine e.g., a processor with memory, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or the like
  • Example 1 is an apparatus configured to be employed in a User Equipment (UE), comprising: a memory interface; and processing circuitry configured to: process higher layer signaling indicating one or more parameters of one or more interfering CSI (Channel State lnformation)-RS (Reference Signal) signals; process one or more received signals, wherein each received signal comprises a serving signal and an associated interfering CSI-RS signal of the one or more interfering CSI-RS signals; for each of the one or more received signals, cancel interference on the serving signal caused by the associated interfering CSI-RS signal based at least in part on the one or more parameters; and send the one or more parameters to a memory via the memory interface.
  • CSI Channel State lnformation
  • Reference Signal Reference Signal
  • Example 2 comprises the subject matter of any variation of any of example(s) 1 , wherein the one or more parameters comprise a CSI-RS type of the one or more interfering CSI-RS signals.
  • Example 3 comprises the subject matter of any variation of any of example(s) 1 , wherein the one or more parameters comprise a number of NZP (Non-Zero Power) CSI-RS APs (Antenna Ports) of the one or more interfering CSI-RS signals.
  • NZP Non-Zero Power
  • CSI-RS APs Antenna Ports
  • Example 4 comprises the subject matter of any variation of any of example(s) 1 , wherein the one or more parameters comprise a subframe configuration of the one or more interfering CSI-RS signals, wherein the subframe configuration indicates a periodicity and an offset for DL (Downlink) subframes for transmission of the interfering CSI-RS signals.
  • Example 5 comprises the subject matter of any variation of any of example(s) 1 , wherein the one or more parameters comprise one or more CSI-RS configurations of a CSI-RS resource of the one or more interfering CSI-RS signals.
  • Example 6 comprises the subject matter of any variation of any of example(s) 1 , wherein the one or more parameters comprise a scrambling identity of the one or more interfering CSI-RS signals.
  • Example 7 comprises the subject matter of any variation of any of example(s) 1 , wherein the one or more parameters comprise a CDM (Code Division Multiplexing) type of the one or more interfering CSI-RS signals, wherein the CDM type is one of 2, 4, or 8.
  • CDM Code Division Multiplexing
  • Example 8 comprises the subject matter of any variation of any of example(s) 1 , wherein the one or more parameters comprise a physical cell ID (identity) and a number of CRS (Cell-specific Reference Signal) ports associated with the one or more interfering CSI-RS signals.
  • the one or more parameters comprise a physical cell ID (identity) and a number of CRS (Cell-specific Reference Signal) ports associated with the one or more interfering CSI-RS signals.
  • Example 9 comprises the subject matter of any variation of any of example(s) 1 , wherein the processing circuitry is further configured to perform channel estimation for one or more APs (antenna ports) corresponding to the one or more interfering CSI- RS signals and to reconstruct the one or more reconstructed interfering CSI-RS signals based on the channel estimation.
  • the processing circuitry is further configured to perform channel estimation for one or more APs (antenna ports) corresponding to the one or more interfering CSI- RS signals and to reconstruct the one or more reconstructed interfering CSI-RS signals based on the channel estimation.
  • Example 10 comprises the subject matter of any variation of any of example(s) 9, wherein the processing circuitry is further configured to subtract the one or more reconstructed interfering CSI-RS signals from the one or more received signals.
  • Example 1 1 comprises the subject matter of any variation of any of example(s) 1 -10, wherein the one or more interfering CSI-RS signals comprises Class A FD (Full Dimension)-MIMO (Multiple Input Multiple Output) CSI-RS signals associated with one or more neighboring TPs (Transmission Points).
  • Class A FD Full Dimension
  • MIMO Multiple Input Multiple Output
  • Example 12 comprises the subject matter of any variation of any of example(s) 1 -10, wherein the one or more interfering CSI-RS signals comprises Class B FD (Full Dimension)-MIMO (Multiple Input Multiple Output) CSI-RS signals associated with a serving BS (Base Station).
  • Class B FD Full Dimension
  • MIMO Multiple Input Multiple Output
  • Example 13 comprises the subject matter of any variation of any of example(s) 1 -10, wherein for at least one of the one or more received signals, the serving signal comprises a serving CSI-RS signal.
  • Example 14 comprises the subject matter of any variation of any of example(s) 1 -10, wherein for at least one of the one or more received signals, the serving signal comprises a PDSCH (Physical Downlink Shared Channel) signal.
  • PDSCH Physical Downlink Shared Channel
  • Example 15 comprises the subject matter of any variation of any of example(s) 14, wherein the processing circuitry is configured to perform PDSCH RE (Resource Element) mapping around fewer than all of the one or more interfering CSI- RS signals.
  • PDSCH RE Resource Element
  • Example 16 comprises the subject matter of any variation of any of example(s) 1 -2, wherein the one or more parameters comprise a number of NZP (Non- Zero Power) CSI-RS APs (Antenna Ports) of the one or more interfering CSI-RS signals.
  • NZP Non- Zero Power
  • CSI-RS APs Antenna Ports
  • Example 17 comprises the subject matter of any variation of any of example(s) 1 -2 or 16, wherein the one or more parameters comprise a subframe configuration of the one or more interfering CSI-RS signals, wherein the subframe configuration indicates a periodicity and an offset for DL (Downlink) subframes for transmission of the interfering CSI-RS signals.
  • Example 18 comprises the subject matter of any variation of any of example(s) 1 -2 or 16-17, wherein the one or more parameters comprise one or more CSI-RS configurations of a CSI-RS resource of the one or more interfering CSI-RS signals.
  • Example 19 comprises the subject matter of any variation of any of example(s) 1 -2 or 16-18, wherein the one or more parameters comprise a scrambling identity of the one or more interfering CSI-RS signals.
  • Example 20 comprises the subject matter of any variation of any of example(s) 1 -2 or 16-19, wherein the one or more parameters comprise a CDM (Code Division Multiplexing) type of the one or more interfering CSI-RS signals, wherein the CDM type is one of 2, 4, or 8.
  • CDM Code Division Multiplexing
  • Example 21 comprises the subject matter of any variation of any of example(s) 1 -2 or 16-20, wherein the one or more parameters comprise a physical cell ID (identity) and a number of CRS (Cell-specific Reference Signal) ports associated with the one or more interfering CSI-RS signals.
  • the one or more parameters comprise a physical cell ID (identity) and a number of CRS (Cell-specific Reference Signal) ports associated with the one or more interfering CSI-RS signals.
  • Example 22 comprises the subject matter of any variation of any of example(s) 1 -2 or 16-21 , wherein the processing circuitry is further configured to perform channel estimation for one or more APs (antenna ports) corresponding to the one or more interfering CSI-RS signals and to reconstruct the one or more
  • Example 23 comprises the subject matter of any variation of any of example(s) 22, wherein the processing circuitry is further configured to subtract the one or more reconstructed interfering CSI-RS signals from the one or more received signals.
  • Example 24 comprises the subject matter of any variation of any of example(s) 1 -2 or 16-23, wherein the one or more interfering CSI-RS signals comprises one of: Class A FD (Full Dimension)-MIMO (Multiple Input Multiple Output) CSI-RS signals associated with one or more neighboring TPs (Transmission Points), or Class B FD (Full Dimension)-MIMO (Multiple Input Multiple Output) CSI-RS signals associated with a serving BS (Base Station).
  • Example 25 is an apparatus configured to be employed in an Evolved NodeB (eNB), comprising: a memory interface; and processing circuitry configured to: generate a set of CSI (Channel State lnformation)-RS (Reference Signal) signals for one or more UEs (User Equipments); generate one or more X2 messages for one or more neighboring TP (Transmission Point), wherein each of the one or more X2 messages indicates one or more parameters of the set of CSI-RS signals; and send the one or more parameters to a memory via the memory interface.
  • CSI Channel State lnformation
  • UEs User Equipments
  • X2 messages for one or more neighboring TP (Transmission Point)
  • TP Transmission Point
  • Example 26 comprises the subject matter of any variation of any of example(s) 25, wherein the one or more parameters comprise a CSI-RS type of the one or more interfering CSI-RS signals.
  • Example 27 comprises the subject matter of any variation of any of example(s) 25, wherein the one or more parameters comprise a number of NZP (Non- Zero Power) CSI-RS APs (Antenna Ports) of the one or more interfering CSI-RS signals.
  • NZP Non- Zero Power
  • CSI-RS APs Antenna Ports
  • Example 28 comprises the subject matter of any variation of any of example(s) 25, wherein the one or more parameters comprise a subframe configuration of the one or more interfering CSI-RS signals, wherein the subframe configuration indicates a periodicity and an offset for DL (Downlink) subframes for transmission of the interfering CSI-RS signals.
  • Example 29 comprises the subject matter of any variation of any of example(s) 25, wherein the one or more parameters comprise one or more CSI-RS configurations of a CSI-RS resource of the one or more interfering CSI-RS signals.
  • Example 30 comprises the subject matter of any variation of any of example(s) 25, wherein the one or more parameters comprise a scrambling identity of the one or more interfering CSI-RS signals.
  • Example 31 comprises the subject matter of any variation of any of example(s) 25, wherein the one or more parameters comprise a CDM (Code Division Multiplexing) type of the one or more interfering CSI-RS signals, wherein the CDM type is one of 2, 4, or 8.
  • Example 32 comprises the subject matter of any variation of any of example(s) 25-31 , wherein the one or more parameters comprise a physical cell ID (identity) and a number of CRS (Cell-specific Reference Signal) ports associated with the one or more interfering CSI-RS signals.
  • CDM Code Division Multiplexing
  • Example 33 comprises the subject matter of any variation of any of example(s) 25-31 , wherein the processing circuitry is further configured to generate one or more DCI (Downlink Control Information) messages that indicates at least a subset of the set of interfering CSI-RS signals, wherein PDSCH (Physical Downlink Shared Channel) RE (Resource Element) mapping is to be performed around at least the subset.
  • DCI Downlink Control Information
  • Example 34 comprises the subject matter of any variation of any of example(s) 33, wherein each of the one or more DCI messages comprises a 2 bit field that indicates the subset as one of four possible subsets.
  • Example 35 comprises the subject matter of any variation of any of example(s) 25-26, wherein the one or more parameters comprise a number of NZP
  • CSI-RS APs (Antenna Ports) of the one or more interfering CSI-RS signals.
  • Example 36 comprises the subject matter of any variation of any of example(s) 25-26 or 35, wherein the one or more parameters comprise a subframe configuration of the one or more interfering CSI-RS signals, wherein the subframe configuration indicates a periodicity and an offset for DL (Downlink) subframes for transmission of the interfering CSI-RS signals.
  • Example 37 is an apparatus configured to be employed in an Evolved NodeB (eNB), comprising: a memory interface; and processing circuitry configured to: generate higher layer signaling for one or more UEs (User Equipments), wherein the higher layer signaling indicates one or more parameters of a set of interfering CSI (Channel State lnformation)-RS (Reference Signal) signals, wherein the set of interfering CSI-RS are associated with a set of REs (Resource Elements); generate one or more serving signals for the one or more UEs via at least a subset of the set of REs; and send the one or more parameters to a memory via the memory interface.
  • eNB Evolved NodeB
  • Example 38 comprises the subject matter of any variation of any of example(s) 37, wherein the one or more parameters comprise one or more of: a CSI-RS signal type, a number of NZP (Non-Zero Power) CSI-RS resource APs (antenna ports), a subframe configuration indicating a periodicity and an offset in downlink subframes for transmission of the set of interfering CSI-RS signals, one or more CSI-RS configurations that constitute a NZP CSI-RS resource, a scrambling identity used for generating a sequence for modulations of NZP CSI-RS antenna port signals, a CDM (Code Division Multiplexing) type, a physical cell ID (Identity), or a number of CRS (Cell- specific) ports of a TP (transmission point) associated with the set of interfering CSI-RS signals.
  • a CSI-RS signal type a number of NZP (Non-Zero Power) CSI-RS resource APs (antenn
  • Example 39 comprises the subject matter of any variation of any of example(s) 37-38, wherein the processing circuitry is further configured to generate one or more DCI (Downlink Control Information) messages that indicates the set of interfering CSI-RS signals around which PDSCH (Physical Downlink Shared Channel) RE (Resource Element) mapping is to be performed.
  • DCI Downlink Control Information
  • Example 40 comprises the subject matter of any variation of any of example(s) 39, wherein each of the one or more DCI messages comprises a 2 bit field that indicates the set of interfering CSI-RS signals as one of four possible sets of interfering CSI-RS signals.

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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 des techniques pour faciliter et/ou effectuer une annulation de brouillage sur un RS (signal de référence) de CSI (informations d'état de canal) de brouillage. Selon un premier ensemble d'aspects, l'invention concerne des techniques permettant de faciliter l'annulation d'un brouillage de CSI-RS de brouillage provenant d'un PDSCH (canal physique partagé sur la liaison descendante) ou d'un CSI-RS de desserte. Selon un second ensemble d'aspects, l'invention concerne des techniques permettant de faciliter la communication de paramètres d'un CSI-RS de brouillage depuis une BS (station de base) vers un UE (équipement d'utilisateur). Selon certains desdits aspects, les paramètres du CSI-RS de brouillage peuvent être communiqués à la BS à partir d'une BS voisine par l'intermédiaire d'une signalisation X2.
PCT/US2017/030010 2016-05-04 2017-04-28 Émission de rs (signal de référence) de csi (informations d'état de canal) avec un récepteur à ic (annulation de brouillage) de csi-rs WO2017192371A1 (fr)

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