WO2014023727A1 - Procédé et appareil permettant de fournir un retour de relation de phase entre points d'émission pour une technique comp de transmission commune - Google Patents

Procédé et appareil permettant de fournir un retour de relation de phase entre points d'émission pour une technique comp de transmission commune Download PDF

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Publication number
WO2014023727A1
WO2014023727A1 PCT/EP2013/066475 EP2013066475W WO2014023727A1 WO 2014023727 A1 WO2014023727 A1 WO 2014023727A1 EP 2013066475 W EP2013066475 W EP 2013066475W WO 2014023727 A1 WO2014023727 A1 WO 2014023727A1
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WIPO (PCT)
Prior art keywords
transmission
precoding matrix
state information
channel state
reference signal
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PCT/EP2013/066475
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English (en)
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WO2014023727A9 (fr
Inventor
Timo Erkki Lunttila
Weidong Yang
Klaus Hugl
Frederick Vook
Eugene Visotsky
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Nokia Siemens Networks Oy
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Priority to US14/419,757 priority Critical patent/US9660784B2/en
Publication of WO2014023727A1 publication Critical patent/WO2014023727A1/fr
Publication of WO2014023727A9 publication Critical patent/WO2014023727A9/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
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
    • 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

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer programs and, more specifically, relate to coordinated multipoint (CoMP) transmission and reception techniques, such as those proposed for long term evolution (LTE) advanced (LTE-A), including coherent joint transmission (JT) CoMP techniques, and to resource allocation such as channel state information (CSI) and reference signal (RS) allocation and related feedback from a user equipment (UE) to a network transmission point, such as an evolved NodeB or more simply an eNB.
  • CoMP coordinated multipoint
  • LTE long term evolution
  • LTE-A long term evolution
  • JT coherent joint transmission
  • resource allocation such as channel state information (CSI) and reference signal (RS) allocation and related feedback from a user equipment (UE) to a network transmission point, such as an evolved NodeB or more simply an eNB.
  • CSI channel state information
  • RS reference signal
  • the eNB allocates physical layer resources for uplink (UL, to the eNB) and downlink (DL, from the eNB) shared channels.
  • the physical layer resources in- elude physical resource blocks (PRB) and a modulation coding scheme (MCS).
  • the MCS determines the bit rate, and thus the capacity, of the PRBs. Allocations may be valid for one or more transmission time intervals (TTIs).
  • TTIs transmission time intervals
  • CoMP Coordinated Multipoint
  • an apparatus comprises at least one processor and memory storing a program of instructions.
  • the memory storing the program of instructions is configured to, with the at least one processor, cause the apparatus to at least compute a co-phasing coefficient value for maximizing signal to noise ratio of a composite channel for transmission to a user device, the composite channel comprising first and second transmission points.
  • Computing the co-phasing value comprises receiving first, second, and third precoding matrix indicators, wherein the third precoding matrix indicator is computed based on transmission of the first and second precoding matrix indicators over a joint channel state information refer- ence signal resource from first and second transmission points and calculating the co-phasing coefficient value based on the first, second, and third precoding matrix indicators, the first and second precoding matrix indicators are computed based on feedback by a user device based, respectively, on transmissions of first and second channel state information reference resources from first and second transmission points, respectively.
  • a method comprises computing a co- phasing coefficient value for maximizing signal to noise ratio of a composite channel for transmission to a user device, the composite channel comprising first and second transmission points.
  • Computing the co-phasing value comprises receiving first, se- cond, and third precoding matrix indicators, wherein the third precoding matrix indicator is computed based on transmission of the first and second precoding matrix indicators over a joint channel state information reference signal resource from first and second transmission points and calculating the co-phasing coefficient value based on the first, second, and third precoding matrix indicators.
  • the first and second precoding matrix indicators are computed based on feedback by a user device based, respectively, on transmissions of first and second channel state information reference resources from first and second transmission points, respectively.
  • a computer readable medium stores a program of instructions. Execution of the program of instructions by the processor configures an apparatus to at least compute a co-phasing coefficient value for max- imizing signal to noise ratio of a composite channel for transmission to a user device, the composite channel comprising first and second transmission points.
  • Computing the co-phasing value comprises receiving first, second, and third precoding matrix indicators, wherein the third precoding matrix indicator is computed based on transmission of the first and second precoding matrix indicators over a joint channel state information reference signal resource from first and second transmission points and calculating the co-phasing coefficient value based on the first, second, and third precoding matrix indicators.
  • the first and second precoding matrix indicators are computed based on feedback by a user device based, respectively, on transmissions of first and second channel state information reference resources from first and se- cond transmission points, respectively.
  • a method comprises configuring a two-port channel state information reference signal resource across two cells of a wireless cellular network, wherein the two ports are first and second ports, and wherein first and second precoding vectors, respectively, are used for transmission on the first and second ports of the resource and deriving a co-phasing factor for cooperative multipoint transmission based on the transmitted precoders.
  • Figure 1 illustrates a wireless network that may be configured according to an embodiment of the present invention.
  • Figure 2A illustrates an uplink resource grid showing a resource configuration that may be used in systems according to embodiments of the present invention, and shows the relationship of single carrier frequency-division multiple access (SC- FDMA) symbols, subcarriers, resource blocks and resource elements.
  • SC- FDMA single carrier frequency-division multiple access
  • Figure 2B illustrates an uplink resource grid showing a resource configuration that may be used in systems according to embodiments of the present invention, and shows the relationship of orthogonal frequency-division multiplexing (OFDM) sym- bols, subcarriers, resource blocks and resource elements.
  • Figure 3 illustrates joint transmission cooperative multi-point operation by elements that may be used in an embodiment of the present invention.
  • OFDM orthogonal frequency-division multiplexing
  • Figure 4 shows a simplified block diagram of various electronic devices that are suitable for use in practicing embodiments of this invention.
  • Figure 5 presents a table showing mapping from a channel state information (CSI) reference signal configuration to ⁇ k V) for a normal cyclic prefix.
  • Figure 6 illustrates a prior-art channel state information reference signal (CSI-
  • Figure 7 illustrates a channel state information reference signal (CSI-RS) configuration Table illustrating configuration of an additional two transmission port CSI- RS resource shared by two transmission points as compared to the approach illustrated in Figure 5.
  • CSI-RS channel state information reference signal
  • Figure 8 presents an exemplary codebook for transmission on antenna ports ⁇ 0,l ⁇ and for channel state information (CSI) reporting based on antenna ports ⁇ , ⁇ or ⁇ 15,16 ⁇ .
  • CSI channel state information
  • Figure 9 illustrates an exemplary use of precoding matrix indicator (PMI) feedback for indication of a phase difference between two antennas each associated with one transmission point of a pair of transmission points.
  • PMI precoding matrix indicator
  • Figure 10 illustrates a process according to one or more embodiments of the present invention.
  • Figure 1 1 illustrates a transmission point configuration according to one or more embodiments of the present invention.
  • Figure 12 illustrates a process according to one or more embodiments of the present invention.
  • E-UTRAN also referred to as UTRAN-LTE or as E-UTRA
  • the downlink (DL) access technique is OFDMA
  • the uplink (UL) access technique is SC-FDMA.
  • 3GPP TS 36.300 V1 1.0.0 (201 1 -12) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 1 1 ).
  • FIG. 1 illustrates the overall architecture a system 100, such as a E-UTRAN system, in which one or more embodiments of the present invention may be used.
  • the system 100 includes network access nodes or base stations which may be implemented in the form of eNodeBs (eNBs) 102A, 102B, and 102C, and which may provide an E-UTRAN user plane and control plane (radio resource control (RRC)) protocol terminations towards user devices, which in an embodiment may be implemented as user equipments (UEs), here UEs 104A and 104B.
  • RRC radio resource control
  • the eNBs 102A-102C may be interconnected with one another by means of an X2 interface 106.
  • the eNBs 102A-102C may also be connected by means of an S1 interface to an evolved packet core (EPC).
  • EPC evolved packet core
  • the connection may take the form of S1 mobility management entity (S1 MME) interface 108 to MME serving gateways (MME/S- GWs) 1 1 OA and 1 10B.
  • S1 MME S1 mobility management entity
  • MME/S- GWs MME serving gateways
  • Uplink and downlink frames (of 10 msec duration) are defined in 3GPP TS 36.21 1 V10.4.0 (201 1-12) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Ter- restrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10).
  • Figure 2A illustrates an uplink resource grid 200 presenting an exemplary definition of resources that may be used in a system such as the system 100 of Fig. 1 , and showing the relationship of SC-FDMA symbols, subcarriers, resource blocks and resource elements.
  • the grid comprises a plurality of uplink slots, exemplified by the slot 202, which is a time slot.
  • the grid may comprise a resource block comprising, for example, a number (WfL ⁇ fff ) of resource elements.
  • the overall grid may com- prise (i2fl')( Sfl?) subcarriers, while the resource block may comprise (iff? ) subcar- riers.
  • Figure 2B illustrates a downlink resource grid, showing the relationship of OFDM symbols, subcarriers, resource blocks and resource elements.
  • the resource blocks can be referred to as physical resource blocks (PRBs).
  • the grid comprises a plurality of downlink slots, exemplified by the slot 252, which is a time slot.
  • OFDM orthogonal frequency-division multiplexing
  • the grid may comprise a resource block 204 comprising, for example, a number (i ⁇ 3 ⁇ 4fc )( J3 ⁇ 4 ) of resource elements such as the resource element 206.
  • the overall grid may comprise (#3 ⁇ 4 )( M3 ⁇ 4 ) subcarriers, while the resource block may comprise (ifTM) subcarriers.
  • JT CoMP coherent joint transmission
  • data is jointly transmitted to a UE from multiple transmission points.
  • a base station such as an eNB is able to precode the data so that the received signal quality (for example, signal to interfer- ence plus noise ratio (SIN R), throughput, or both, or some alternative or additional characteristic or combination of characteristics) is maximized.
  • SINR signal to interfer- ence plus noise ratio
  • the eNB needs to be able to obtain information not only about a preferred precoder for each participating transmission point, but also information descriptive of a phase difference between the cooperating transmission points in order to optimize the JT CoMP performance.
  • Multiple (two in this non-limiting example) transmission points 302A and 302B send data to a UE 304 using the same time-frequency resources, which may, for example, be physical resource blocks defined in formats similar to those illustrated in Figs. 2A and 2B.
  • the two transmission points 302A and 302B may each be equipped with multiple transmit antennas (which in a non-limiting example may be four).
  • the transmission points 302A and 302B may or may not belong to the same cell - that is, they may have the same or a different physical cell identifier (I D).
  • the transmission point 302A transmits signals 306A-306D from its four antennas, and the transmission point 302B transmits signals 308A-308D from its four antennas.
  • One or more embodiments of the invention provide mechanisms for aligning the phases of the signals transmitted from each of the transmission points. Transmissions are referred to as "coherent" when their phases are aligned. Such align- ment of phases aids in achieving the best possible performance for communication with the UE. If the transmissions are not phase aligned (coherent) then there is a possibility that the signals with opposite phase can cancel each other (destructively interfere) at the UE, resulting in a reduced SINR/throughput and thus reducing any gain that could be achieved by the use of JT CoMP.
  • One or more embodiments of the invention provide for a simple, efficient technique to provide inter-transmission point phase information to the eNB to enable coherent joint processing for downlink cooperative multipoint (DL CoMP).
  • providing such phase information is standards- transparent - that is, mechanisms for providing such information can be implemented while following existing standards.
  • a wireless network 400 is adapted for communication over a wireless link with an apparatus, such as a mobile communication device or node which may be referred to as a UE 402, via a network access node, such as a transmission point or Node B (base station), and more specifically an eNB 404.
  • an apparatus such as a mobile communication device or node which may be referred to as a UE 402
  • a network access node such as a transmission point or Node B (base station)
  • base station Node B
  • the network 400 may include a network control element (NCE) 406 that may include MME/S-GW functionality similar to that shown in Figure 1 , and which may provide connectivity with a further network, such as a telephone network, a data communications network such as the Internet, both such networks, or additional or alternative networks.
  • the UE 402 includes a controller, such as at least one computer or a data processor (DP) 41 OA, at least one non-transitory computer-readable memory medium embodied as a memory (MEM) 410B that stores a program of computer instructions (PROG) 410C, and at least one suitable radio frequency (RF) transmitter and receiver pair (transceiver) 410D for bidirectional wireless communications with the eNB 404 via one or more antennas 410E.
  • DP data processor
  • PROG program of computer instructions
  • RF radio frequency
  • the eNB 404 also includes a controller, such as at least one computer or a data processor (DP) 420A, at least one computer-readable memory medium embodied as a memory (MEM) 420B that stores a program of computer instructions (PROG) 420C, and at least one suitable RF transceiver 420D for communication with the UE 402 via one or more antennas 420E (typically several such as when multiple input / multiple output (MIMO) operation is in use and/or JT CoMP is in use).
  • DP data processor
  • MEM memory
  • PROG program of computer instructions
  • RF transceiver 420D for communication with the UE 402 via one or more antennas 420E (typically several such as when multiple input / multiple output (MIMO) operation is in use and/or JT CoMP is in use).
  • MIMO multiple input / multiple output
  • the NCE includes a controller, such as at least one computer or a data processor (DP) 421A, at least one computer-readable memory medium embodied as a memory (MEM) 421 B that stores a program of computer instructions (PROG) 421 C.
  • the eNB 404 is coupled via a data / control path 422 to the NCE 406.
  • the path 422 may be implemented as an S1 interface similar to that illustrated in Figure 1 .
  • the eNB 404 may also be coupled to another eNB via data / control path 424, which may be implemented using an X2 interface similar to that illustrated in Figure 1 , by some high-capacity, low latency connection which may be proprietary and which may use, for example, optical fiber, or through the use of some combination of interfaces such as an X2 interface and a high-capacity low latency connection.
  • data / control path 424 may be implemented using an X2 interface similar to that illustrated in Figure 1 , by some high-capacity, low latency connection which may be proprietary and which may use, for example, optical fiber, or through the use of some combination of interfaces such as an X2 interface and a high-capacity low latency connection.
  • a second transmission point or network access node such as a remote radio head (RRH) or a second eNB 425 that establishes a connection with the UE 402.
  • the second eNB 425 may include a DP 430A, memory 430B, and transceiver 430D.
  • the second eNB 425 may establish the connection with the UE 402 via antennas 430E.
  • the second eNB 425 may be connected with the NCE 406 via the path 422, and may be connected to the first eNB 404 via the data / control path 424.
  • the radio access node e.g., second eNB 425) is shown so as to repre- sent at least one second transmission point that can operate with the first eNB 404 in order to perform JT CoMP with the UE 402 in accordance with certain examples of one or more embodiments of this invention, as described in detail below.
  • the second transmission point (eNB 425) may have the same or a different cell ID than the first transmission point (eNB 404).
  • UE 402 may be assumed to also include a channel state information-reference signal (CSI-RS) measurement and reporting function (MRF) 41 OF that is operable with, for example, DL RRC signaling from the eNB 404.
  • CSI-RS channel state information-reference signal
  • MRF measurement and reporting function
  • RRC signaling is described in, for example, 3GPP TS 36.331 V10.4.0 (201 1 -12) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Pro- tocol specification (Release 10).
  • the eNB 404 and the eNB 425 may include CSI-RS resource schedulers (RS) 420F, operating in accordance with embodiments of this invention, such as with a non- limiting resource configuration shown in Figure 5 and discussed in greater detail below in connection with Fig. 5. It will be noted that embodiments of the invention are not limited to use with just one assemblage and arrangement of data. Further, and by example, in data configurations such as that illustrated in Figure 5, there can be a different number of transmission points represented, and a different number of an- tennas and ports per transmission point.
  • RS resource schedulers
  • a second CSI-RS resource scheduler (RS) 430F could also be present at the second transmission point (eNB 425).
  • a joint scheduler can be used.
  • a single baseband (BB) unit could also be used for both the first and second transmission points, or each transmission point could operate with its own associated BB unit.
  • BB baseband
  • At least the programs 410C, 420C, 421 C, and 430C may be assumed to include program instructions that, when executed by the associated data processors 41 OA, 420A, 421A, and 430A, enable the device to operate in accordance with the embodiments of this invention, as will be discussed below in greater detail.
  • the embodiments of this invention may be implemented at least in part by computer soft- ware executable by the DP 400A of the UE 402 and/or by the DP 420A of the eNB 404, and/or by the DP 421 A of the NCE 406, and/or by the DP 430A of the eNB 425, or by hardware, or by a combination of software and hardware (and firmware).
  • the various embodiments of the UE 402 can include, but are not limited to, cellular mobile devices, smartphones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communi- cation capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the computer-readable memories 410B, 420B, 421 B, and 430B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, random access memory, read only memory, programmable read only memory, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors 41 OA, 420A, 421 A, and 430A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multi-core processor architectures, as non-limiting examples.
  • a transmission point e.g., the eNB 404
  • CSI-RS channel state information-reference signal
  • the eNB 404 may configure the MRF 410E of the UE 402 to perform CSI measurements and to report measurement results based on one or more CSI-RS resources.
  • This provides at least the RS 420F of the eNB 404 with information necessary to schedule data transmission (i.e., to select the CoMP transmission mode such as JT as well as to determine the appropriate physical resources and/or precoding weights) from any of the transmission points.
  • One or more embodiments of the invention provide for mechanisms for obtaining inter-transmission point phase information.
  • the two transmission points TP1 and TP2 each having 4 transmit (TX) antennas 420E as was shown in Figure 4.
  • the network would configure the UE 402 to measure CSI from two different CSI-RS resource configurations, denoted here with CSI-RS_TP1 and CSI-RS_TP2 for TP1 and TP2, respectively.
  • CSI-RS_TP1 and CSI-RS_TP2 for TP1 and TP2, respectively.
  • the individual CSI-RS resource configurations need to contain 4 CSI-RS signals and should be selected in such a manner that they do not use the same resource ele- ments. This can be achieved by selecting a different CSI-RS resource configuration from a table such as the table 500 illustrated in Fig.
  • CSI-RS resource configurations 1 and 2 of the table 500 of Fig. 5 are selected. These CSI-RS configurations indicate different resource elements.
  • Each of the CSI-RS resource configurations for the two TPs contains 4 CSI reference signals according to a 4 TX configuration.
  • the CSI reference signals are denoted here as:
  • CSI-RS_TP1 ⁇ port15_1 , port16_1, port17_1, port18_1 ⁇ for the antennas Ant1_TP1 to Ant4_TP1
  • CSI-RS_TP2 ⁇ port15_2, port16_2, port17_2, port18_2 ⁇ for the antennas Ant1_TP2 to Ant4_TP2.
  • Inter-CSI-RS phase between CSI-RS_TP1 and CSI-RS_TP2 - namely the phase relationship between one of the antenna ports of the two CSI-RS configurations, i.e., the phase offset of port15_1/ant1_TP1 and port15_2/ant1_TP2 quantized, e.g., to a 4 phase state/QPSK alphabet.
  • phase offset of port15_1/ant1_TP1 and port15_2/ant1_TP2 quantized, e.g., to a 4 phase state/QPSK alphabet.
  • the performance requirement - that is, the definition for the CSI accuracy - is such that when scheduled according to the recommended CSI (including CQI, pre-coding matrix indicator (PMI) and rank indicator (Rl)), the physical uplink shared channel (PDSCH) block error rate shall not exceed 10%.
  • the recommended CSI including CQI, pre-coding matrix indicator (PMI) and rank indicator (Rl)
  • the physical uplink shared channel (PDSCH) block error rate shall not exceed 10%.
  • the feedback from the UE 402 needs to be sufficient to achieve a certain overall data throughput, but need not be sufficient to enable a separate evaluation of the accuracy of the Rl, PMI and CQI feedback. Standardization of such a measurement would call for a significant amount of effort, while also complicating the implementation of the UE 402.
  • One or more embodiments of the invention therefore, provide a network implementation-based method that allows for the network to perform robust coherent joint transmission DL CoMP by providing an eNB such as the eNB 404 of Fig. 4 with information that is needed regarding the phase relationship between different transmission points, and to accomplish this task without a need to standardize a completely new measurement and test methodology in 3GPP, or a need to standardize new required configuration signaling.
  • One or more embodiments of the invention also provide for one or more UE designs or configurations providing directed to enabling the network to perform DL CoMP.
  • One or more exemplary embodiments of the present invention use CSI-RS resource configuration in a novel manner, so as to cause a UE such as the 402 to feedback inter-transmission point phase information to an eNB such as the eNB 404 while using existing codebooks.
  • the goal is to make the inter-transmission point feedback transparent or substantially transparent to a UE such as the UE 402 without requiring any changes to specifications beyond any changes needed to allow CoMP in general.
  • Measures for CoMP include, for example, the possibility to configure more than a single CSI-RS resource and or configure CSI feedback from more than a single CSI-RS resource. Embodiments do not present a need for new "phase measurement" specification effort.
  • Exemplary embodiments of this invention in one aspect thereof configure one additional CSI-RS resource that spans one of the antennas (e.g., CSI-RS_TP12) in each of the participating (e.g., two) transmission points in order to obtain from the UE 402 the phase feedback in the same manner as the proposed inter-CSI-RS phase feed- back.
  • one additional CSI-RS resource that spans one of the antennas (e.g., CSI-RS_TP12) in each of the participating (e.g., two) transmission points in order to obtain from the UE 402 the phase feedback in the same manner as the proposed inter-CSI-RS phase feed- back.
  • three different CSI-RS resources are configured in the following way for a non-limiting ex- ample of using the first antenna of each transmission point (for example, the first antenna of eNB 404 and the first antenna of eNB 425) as a phase reference:
  • CSI-RS_TP1 ⁇ port15_1 , port16_1, port17_1, port18_1 ⁇ for the antennas Ant1_TP1 to Ant4_TP1;
  • ⁇ CSI-RS_TP2 ⁇ port15_2, port16_2, port17_2, port18_2 ⁇ for the antennas Ant1_TP2 to Ant4_TP2;
  • table entries 702, 704, and 706 correspond to the first, second, and third configurations, respectively, defined by the table 500 of Fig. 5.
  • the CSI-RS_TP1_2 may be con- figured to comprise some other pair of antennas (for example the second antenna pair, or the third antenna pair) from two different transmission points.
  • Ant1_TP1 and Ant2_TP2, etc. could be selected. That is, the antennas selected need not be a complementary pair of antennas from two transmission points. More generally, the antennas selected need not be a complementary set of k antennas from m transmission points, where k is equal to or greater than 2.
  • Fig. 8 presents a codebook table 800 taking the form of a precoding matrix indicator associating codebook indices with phase information.
  • the phase of the second antenna port in the PMI of the table 800 of Fig. 8 corresponds to the phase to be applied for transmission between the transmission points.
  • the PMI provides phase information between the transmission points, and this phase information may be used for pre-equalization of phase differences by the network because such equalization is needed for coherent transmission.
  • the PMI fed back from the UE 402 contains the inter-transmission point phase feedback information with 2 bits.
  • Table 900 of Figure 9 shows one non-limiting example of how the fed back PMI can indicate to the eNB 404 (to the resource scheduler 404E) the phase difference between two antennas, each of which is associated with one transmission point of a pair of transmission points.
  • the PMI that is fed back basically indicates to the eNB 404 how it should modify the phase of the second antenna so that the transmitted signals become coherently aligned at the UE 402.
  • the phase difference between the antennas can be derived based on the precoding weight from the first and second antenna by calculating the argument/phase of w1/w2, as shown in the table 900 depicted in Figure 9. It has been noted that a 2-bit, quadrature phase shift keying (QPSK) alphabet seems to be sufficient to achieve most of the gains from in- ter-CSI-RS phase reporting.
  • QPSK quadrature phase shift keying
  • Examples of the embodiments of this invention may be extended to accommodate the case when, for example, four transmission points are cooperating.
  • one 2-antenna port inter-transmission point CSI-RS configuration could be used for each pair of transmission points.
  • a network represented by, for example, the RS 420F of the eNB 404) configures (for example, by RRC signaling) a set of n CSI-RS resources for the UE 402 to measure.
  • the set of n CSI-RS resources includes at least one CSI-RS resource that spans over at least two transmission points, where n is a number greater than the number of cooperating transmission points.
  • the network also configures CSI feedback corresponding to each CSI-RS resource.
  • This CSI feedback configuration may involve either periodic or aperiodic feedback.
  • the reporting mode and other related parameter (periodicity) may be configured separately for each CSI-RS resource.
  • the UE 402 performs CSI measurements based on the configured CSI-RS resources and transmits (reports) the CSI feedback to the network.
  • the CSI feedback contains, for example, at least the PMI and may contain one or both of the Rl and the corresponding CQI.
  • the fed back PMI is received by the network and, in accordance with exemplary embodiments of this invention, indicates to the eNB 404 the inter-transmission point phase relationship.
  • the network may utilize the CSI feedback information (including the indicated inter-transmission point phase relationship) in the selection of preferred precoders for coherent JT CoMP transmission.
  • a further aspect of the exemplary embodiments of this invention related to a non- transitory computer-readable medium that contains software program instructions, where execution of the software program instructions by at least one data processor results in performance of operations that comprise the execution of the process shown in Figure 10 and described above.
  • the exemplary embodiments of this invention can in one aspect be viewed as being primarily (if not totally) related to the eNB/network implementation, and largely transparent to the UE 10.
  • the use of the exemplary embodiments of this invention enables configuration of the antenna ports in the transmission points to enable the network to perform coherent JT CoMP.
  • of this invention needs only one antenna port per transmission point to be jointly configured to obtain inter-transmission point phase information at the eNB 404, whereas the prior pro- posals assume all antenna ports need to be taken into account in the calculation.
  • Exemplary embodiments of this invention provide that the eNB 404 configures the inter-transmission point CSI-RS resource to include one TX antenna in each trans- mission point. This is significantly different than the prior art, where an aggregated feedback model assumes that all TX antennas in the cooperating transmission points are included in the CSI-RS resource, and where the inter-CSI-RS phase measurement may take all antennas in each transmission point into account.
  • the TX antennas between which the inter-TP feedback is configured may be of the same orientation - for example, the "first" antenna of each transmission point, and where the 'paired' antennas have, for example, the same polarization (vertical or horizontal).
  • the eNB 404 performs transmission by knowing the CSI for transmission point 1 (TP1 ) and the CSI for transmission point 2 (TP2), and the inter-transmission point PMI and the antennas for which the CSI for each transmission point has been calculated.
  • the eNB 404 can then calculate the precoders for coherent JT CoMP from TP1 and TP2 as:
  • TP1 PMI(CS/-RS_7Pi) for TP1 ;
  • TP2 PM ⁇ CSI-RS_TP2) * PMI(port16_3)/PMI3(port15_3) for TP2.
  • the invention provides in one aspect thereof a standards-transparent solution to enable coherent JT CoMP with no added implementation complexity for the UE 402, and with no additional standardization effort.
  • the UE 402 does not need to know that it should actually perform a specific phase measurement for coherent joint transmis- sion, as exactly the same CSI measurement can be applied as with conventional multi-input-multi-output (MIMO) operation.
  • MIMO multi-input-multi-output
  • the use of the exemplary embodiments of this invention enables different reporting granularities (in the frequency/PRB domain) or periodicities (in the time domain) to be configured for the intra-transmission point feedback and for the inter- transmission point feedback, allowing the signaling overhead to be optimized.
  • the various blocks shown in Figure 10 and discussed above may be viewed, for example, as method steps, as operations that result from operation of computer program code, as a plurality of logic circuit elements constructed to carry out the associated function or functions, or of some combination of such steps or operations.
  • the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • a further aspect of the exemplary embodiments of this invention is an apparatus that comprises at least one data processor and at least one memory that includes computer program code.
  • the at least one memory and computer program code are configured, with the at least one data processor, to cause the apparatus at least to configure a set of n CSI-RS resources for a UE to measure, where the set of n CSI-RS resources includes at least one CSI-RS resource that spans over at least two transmission points.
  • the at least one memory and computer program code are further configured, with the at least one data pro- cessor, to also cause the apparatus to configure CSI feedback corresponding to each CSI-RS resource, to receive CSI feedback from the UE, the CSI feedback comprising at least PMI and possibly Rl and corresponding CQI for each configured CSI-RS resource.
  • the PMI value indicates an inter-transmission point phase relationship.
  • the at least one memory and computer program code are further configured, with the at least one data processor, to utilize CSI feedback information, including the indicated inter-transmission point phase relationship, for selecting precoders for accomplishing a coherent joint CoMP transmission.
  • a still further aspect of the exemplary embodiments of this invention is an apparatus that comprise means for configuring a set of n CSI-RS resources for a UE to measure, where the set of n CSI-RS resources includes at least one CSI-RS resource that spans over at least two transmission points.
  • the apparatus further comprises means for configuring the UE for CSI feedback corresponding to each CSI-RS resource and means for receiving CSI feedback from the UE, where the CSI feedback comprises at least PMI and possibly Rl and corresponding CQI for each configured CSI-RS resource.
  • the PMI value indicates an inter-transmission point phase relationship.
  • the apparatus further comprises means for utilizing the CSI feedback information, including the inter-transmission point phase relationship that is indicated by the PMI value, for selecting precoders for accomplishing a coherent joint CoMP transmission.
  • the exemplary embodiments of this invention further encompass a method, an apparatus and a computer program product configured to enable a user equipment to re- ceive a measurement configuration for a set of n CSI-RS resources, where the set of n CSI-RS resources includes at least one CSI-RS resource that spans over at least two transmission points, and to measure and report CSI feedback corresponding to each CSI-RS resource, where the CSI feedback comprises at least PMI and possibly Rl and corresponding CQI for each configured CSI-RS resource.
  • apparatus and computer program product at least one PMI value that is fed back indicates an inter-transmission point phase relationship for enabling a network resource scheduler function to at least select precoders for accomplishing a coherent joint CoMP transmission to the user equipment.
  • the integrated circuit, or circuits may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are con- figurable so as to operate in accordance with the exemplary embodiments of this invention.
  • a still further aspect of the exemplary embodiments of this invention is an apparatus that comprise means for configuring a set of n CSI-RS resources for a UE to meas- ure, where the set of n CSI-RS resources includes at least one CSI-RS resource that spans over at least two transmission points.
  • the apparatus further comprises means for configuring the UE for CSI feedback corresponding to each CSI-RS resource and means for receiving CSI feedback from the UE, where the CSI feedback comprises at least PMI and possibly Rl and corresponding CQI for each configured CSI-RS re- source.
  • the PMI value indicates an inter-transmission point phase relationship.
  • the apparatus further comprises means for utilizing the CSI feedback information, including the inter-transmission point phase relationship that is indicated by the PMI value, for selecting precoders for accomplishing a coherent joint CoMP transmission.
  • the exemplary embodiments of this invention further encompass a method, an apparatus and a computer program product configured to enable a user equipment to receive a measurement configuration for a set of n CSI-RS resources, where the set of n CSI-RS resources includes at least one CSI-RS resource that spans over at least two transmission points, and to measure and report CSI feedback corresponding to each CSI-RS resource, where the CSI feedback comprises at least PMI and possibly Rl and corresponding CQI for each configured CSI-RS resource.
  • apparatus and computer program product at least one PMI value that is fed back indicates an inter-transmission point phase relationship for enabling a network resource scheduler function to at least select precoders for accomplishing a coherent joint CoMP transmission to the user equipment.
  • the integrated circuit, or circuits may comprise circuitry (as well as possibly firmware) for embody- ing at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this invention.
  • a UE can feed back single cell PMIs from two cells through two CSI-RS resources, and use a third CSI-RS resource to probe the co- phasing information.
  • One method to probe the co-phasing information is by mapping two antennas from two transmission points to two CSI-RS ports. Yet this mapping scheme is problematic as the JT CoMP scheme requires sub-band channel information. In a sub-band, the signal at one antenna can suffer severe fading hence the probed co-phasing information is of low quality.
  • more than one antennas from each TP are mapped to CSI-RS ports alternately in PRBs in a sub- band (a sub-band consists of multiple PRBs). By probing with more than one antenna from each TP, the impact of severe fading is reduced and a co-phasing information of higher quality is obtained.
  • Embodiments of the invention recognize that coherent joint transmission (JT) achieves better performance using a subband precoding matrix indicator (PMI) than with a wideband PMI. Embodiments of the invention therefore provide mechanisms to feedback one or more subband PMI in coherent JT applications. If a single antenna port is used to provide a phase reference for each transmission point (TP) is used to provide the phase reference for each TP, this single port signal may suffer fade, so that the extracted phase information is of little use. Embodiments of the invention therefore provide for the use of two antenna ports from each transmission point to provide a phase reference, recognizing that that the probability that both antenna port signals in a subband will suffer fade at the same time is lower than the probability that one antenna port signal will suffer fade.
  • TP transmission point
  • Embodiments of the invention therefore provide for the use of two antenna ports from each transmission point to provide a phase reference, recognizing that that the probability that both antenna port signals in a subband will suffer fade at the same time is lower than the probability that one antenna port signal will suffer fade
  • the transmitted signals from two physical antennas at each TP are precoded and mapped to one antenna port in resource 3.
  • TPs use different precoders, for example, [1 1], [1 1], [1 [1 -y], from one occasion to another.
  • TP1 may use [1 1] to map physical antennas 1 and 3 on TP 1 to antenna port 0 in resource 3
  • TP2 may use [1 -1] to map physical antennas 1 and 3 on TP2 to antenna port 1 in resource 3.
  • the feedback PMI on resource 3 is useful for a base station such as an eNodeB (eNB) to determine the phase difference, or construct an estimate of the phase difference, between two TPs. Otherwise, a user device, such as a user equipment (UE) or an eNB must wait until the right combination is used on resource 3 to determine the phase difference between two TPs. Additional examples are described below.
  • eNB eNodeB
  • re- source 3 may be used in a time division multiplexing (TDM) fashion for all UEs being served by TP1 and TP2, and the feedback on resource 3 is useful when the proper combination of precoded transmissions occurs on both TPs.
  • TDM time division multiplexing
  • a factorization of the rotation matrix is performed.
  • a fixed precoding matrix obtained from the factorization of the rotation ma- trix, is applied to two physical antennas.
  • the precoded signal is mapped to one port in resource 3.
  • An eNB does not change the precoder applied on physical antennas from resource 3 from one occasion to another, and so the feedback from resource 3 always provides information relating to the correct phase difference, as well as preventing the loss of reliability of phase information associated with fading.
  • Embodiments of the present invention recognize that a receiver, such as a receiver of a UE, may be modeled as:
  • the co-phase optimization involves changing a to maximize
  • UE selected precoders may be used. These may be v1 , v2, which can be derived from the channel state information reference signal (CSI-RS) resources configured for single cell CSI on the CSI-RS ports. This yields:
  • CSI-RS channel state information reference signal
  • the eNB may trigger aperiodic CSI feedback, allowing a group of UEs that happen to have the same ⁇ v1 ,v2 ⁇ to feed back the PMI from an inter-TP CSI-RS resource.
  • UEs set to send periodic CSI it may be desired to use only the feedback matching the precoder combination ⁇ v1 ,v2 ⁇ at the eNB.
  • all the UEs configured with an inter-TP CSI-RS resource may use the resource to compute a PMI, and the PMI may be suitable for both periodic and aperiodic CSI feedback.
  • Transmission may be performed on CSI-RS ports, with the UE forming the correlation:
  • both TP1 and TP2 may be 2 Tx, that is, using two transmission antennas.
  • Transmission point configurations may be chosen so that ( v 2 ⁇ v i ) ' s non-zero for all j and v 2 . Consequently for 4Tx (using four transmit antennas at each TP), only the first and third antennas are mapped to the resources. For 8 Tx (using 8 transmit antennas at each TP), only the first and fifth antennas are mapped to the resources. With this restriction, the codeword ⁇ ⁇ and v 2 can only take values from [1
  • the rotation matrix R is given by
  • Fig. 1 1 therefore illustrates a first transmission point 1 100 comprising ports 1 102A-1 102D, and a second transmission port 1 150 comprising ports 1 152A-1 152D.
  • a first CSI-RS resource 1 1 10 is configured across the ports 1 102A-1 102D of the transmission point 1 100 and a second CSI-RS resource 1 160 is configured across the ports 1 152A-1 152D of the transmission point 1 150.
  • the first resource may have a first precoded transmission 1 1 15 with a PMI 1 and the second resource may have a second precoded transmission 1 165 with a PMI 2.
  • An inter-transmission point CSI-RS resource may be configured on ports 1 102A and 1 152D to identify the co-phasing coefficient a. However, if the port 1 102A or 1 152A suffers fading, the identified a is not reliable.
  • a first embodiment of the invention therefore, provides for the configuration of a third resource CSI-RS 1 180 across specified ports of the first and second transmission points 1 100 and 1 150, respectively.
  • the third CSI-RS resource may, for example, be configured on port 1 100A and port 1 152A. Not all antennas of both transmission points need necessarily be used for the third CSI-RS resource. Joint transmission CoMP UEs may be divided into groups - UEs having the same subset PMI and subset of PMI 2 can share a CSI-RS resource 3.
  • Fig. 12 illustrates a process 1200 according to an embodiment of the present invention.
  • first, second, and third CSI-RS resources are configured at a first transmission point, at a second transmission point, and across the first and second transmission points, respectively.
  • a first transmission point sends a first CSI-RS resource.
  • a UE measures and sends back PMI 1 , CQI1 , and RI1 , based on the first CSI-RS resource.
  • a second transmission point sends a second CSI-RS resource.
  • a UE measures and sends back PMI2, CQI2, and RI2, based on the first CSI-RS resource.
  • the first and second transmission points send PMI 1 and PMI2, respectively, over one port of a third CSI-RS resource.
  • Transmission may be in the form of a two- port reference signal, one from the first transmission point, and one from the second. Transmission of PMI 1 and PMI2 are accomplished simultaneously.
  • the UE measures and sends back PMI3 as feedback to an eNB, and at block 1214 the eNB calculates a joint transmission co-phasing term from PMI 1 , PMI2, and PMI3.
  • a rotation precoding vector is sent by the first and second transmission points.
  • Fig. 13 illustrates a process 1300 according to this alternative embodiment of the invention.
  • first, second, and third CSI-RS resources are configured at a first transmission point, at a second transmission point, and across the first and second transmission points, respectively.
  • a first transmission point sends a first CSI-RS resource.
  • a UE measures and sends back PMI 1 , CQI 1 , and RI 1 , based on the first CSI-RS resource.
  • a second transmission point sends a second CSI-RS re- source.
  • a UE measures and sends back PMI2, CQI2, and RI2, based on the first CSI-RS resource.
  • the first and second transmission points send a rotation precoding vector alternating on physical resource blocks on one port from the third CSI-RS resource.
  • This resource may comprise a two-port reference signal, one from the first transmission point and one from the second transmission point at the same time. Transmission of PMI 1 and PMI2 are accomplished simultaneously. This approach may be extended to more than one transmission point: in a two transmitter approach, the ports might be the first and second port of each transmitter; in a four transmitter approach, the ports might be the first and third ports of each transmitter, and in an 8 transmitter approach, the ports might be the first and fifth ports of each transmitter.
  • the UE measures and sends back PMI3 as feedback to an eNB, and at block 1314 the eNB calculates a joint transmission co-phasing term from PMI1 , PMI2, and PMI3.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are “connected” or “coupled” together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connec- tions, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non-exhaustive examples.
  • the various names used for the described parameters are not intended to be limiting in any respect, as these parameters may be identified by any suitable names. Further, any formulas and expressions that use these various parameters may differ from those expressly disclosed herein. Further, the various names assigned to different channels (e.g., PDSCH) and information elements are not intended to be limiting in any respect, as these various channels and information elements may be identified by any suitable names.

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Abstract

La présente invention porte sur des systèmes et des techniques pour un multipoint coopératif à transmission commune. Un ensemble de n ressources de signal de référence d'informations d'état de canal doit être mesuré par un dispositif utilisateur. Les n ressources de signal de référence d'informations d'état de canal incluent au moins une ressource de signal de référence d'informations d'état de canal couvrant au moins deux points d'émission. Un retour d'informations d'état de canal correspondant à chaque ressource de signal de référence d'informations d'état de canal est configuré. Lors de la réception d'informations d'état de canal en provenance du dispositif utilisateur, au moins un précodeur est sélectionné pour une transmission multipoint coopérative commune cohérente sur la base d'informations de relation de phase de point inter-transmission. Un facteur de cophasage est dérivé des précodeurs transmis sur une ressource de signal de référence d'informations d'état de canal intercellulaire, la dérivation comprenant la transmission de signaux de référence au moyen de premier et deuxième vecteurs de précodage sur deux points d'accès, le calcul d'un troisième vecteur au moyen du retour basé sur les signaux de référence précodés, et le calcul du facteur de cophasage sur la base des premier, deuxième et troisième vecteurs.
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EP2807759A4 (fr) * 2012-01-27 2015-10-28 Intel Corp N ud b évolué et procédé destiné à une transmission multipoint coordonnée cohérente avec une rétroaction par csi-rs
CN105099604A (zh) * 2014-05-07 2015-11-25 中兴通讯股份有限公司 信道状态反馈信息反馈方法、终端、基站及通信系统
EP3780711A1 (fr) * 2015-03-16 2021-02-17 NTT DoCoMo, Inc. Appareil d'utilisateur, station de base et procédé de communication
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WO2017065652A1 (fr) * 2015-10-12 2017-04-20 Telefonaktiebolaget Lm Ericsson (Publ) Signalement de pmi pour un ensemble de ports
WO2018200194A1 (fr) * 2017-04-27 2018-11-01 Qualcomm Incorporated Synchronisation de phase radio permettant une transmission conjointe de comp sur la base de la réciprocité
US10616839B2 (en) 2017-04-27 2020-04-07 Qualcomm Incorporated Over-the-air phase synchronizatin for reciprocity-based comp joint transmission
CN111213325A (zh) * 2017-06-14 2020-05-29 Lg电子株式会社 在无线通信系统中报告信道状态信息的方法及其装置
CN111213325B (zh) * 2017-06-14 2023-06-20 Lg电子株式会社 在无线通信系统中报告信道状态信息的方法及其装置
WO2023125024A1 (fr) * 2021-12-31 2023-07-06 华为技术有限公司 Procédé et appareil de communication
CN116015590A (zh) * 2022-12-30 2023-04-25 上海星思半导体有限责任公司 一种信号的相位对齐方法、装置及相关设备
CN116015590B (zh) * 2022-12-30 2023-07-21 上海星思半导体有限责任公司 一种信号的相位对齐方法、装置及相关设备

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