WO2011098670A1 - Support de signalisation pour retour d'informations d'état de canaux mimo - Google Patents

Support de signalisation pour retour d'informations d'état de canaux mimo Download PDF

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Publication number
WO2011098670A1
WO2011098670A1 PCT/FI2011/050114 FI2011050114W WO2011098670A1 WO 2011098670 A1 WO2011098670 A1 WO 2011098670A1 FI 2011050114 W FI2011050114 W FI 2011050114W WO 2011098670 A1 WO2011098670 A1 WO 2011098670A1
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WIPO (PCT)
Prior art keywords
report
codebook
indication
network access
access node
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PCT/FI2011/050114
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English (en)
Inventor
Timo Lunttila
Tommi Koivisto
Timo Roman
Mihai Enescu
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Nokia Corporation
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Publication of WO2011098670A1 publication Critical patent/WO2011098670A1/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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback
    • H04B7/065—Variable contents, e.g. long-term or short-short
    • 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
    • H04L25/03898—Spatial equalizers codebook-based design
    • H04L25/0391—Spatial equalizers codebook-based design construction details of matrices
    • H04L25/03923—Spatial equalizers codebook-based design construction details of matrices according to the rank
    • 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
    • H04L25/03898—Spatial equalizers codebook-based design
    • H04L25/03936—Spatial equalizers codebook-based design multi-resolution codebooks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—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 single user and multi-user multiple input, multiple output transmissions from a network access node to a mobile node, and to feedback concerning same sent from the mobile node to the network access node.
  • CSI channel state information (includes, e.g., CQI, PMI, and RI)
  • eNB E-UTRAN Node B (evolved Node B, base station)
  • LTE E-UTRAN evolved UTRAN
  • E-UTRAN LTE long term evolution of UTRAN
  • LTE-A LTE advanced MAC medium access control (layer 2, L2)
  • UE user equipment e.g., a mobile station, mobile node or mobile terminal
  • E -UTRAN also referred to as UTRAN-LTE or as E-UTRA
  • DL access technique OFDMA
  • SC-FDMA SC-FDMA
  • FIG 1A reproduces Figure 4-1 of 3GPP TS 36.300 V8.8.0, and shows the overall architecture of the EUTRAN system 2 (Rel-8).
  • the E-UTRAN system 2 includes eNBs 3, providing the E-UTRAN user plane (PDCP/RLC/MAC/PHY) and control plane (RRC) protocol terminations towards the UE (not shown).
  • the eNBs 3 are interconnected with each other by means of an X2 interface.
  • the eNBs 3 are also connected by means of an SI interface to an EPC, more specifically to a MME by means of a SI MME interface and to an S-GW by means of a S I interface (MME/S-GW 4).
  • the SI interface supports a many-to-many relationship between MMEs/S-GWs and eNBs.
  • the eNB hosts the following functions:
  • RRM Radio Admission Control
  • Connection Mobility Control Dynamic allocation of resources to UEs in both UL and DL (scheduling);
  • LTE-Advanced LTE-Advanced
  • 3GPP LTE e.g., LTE Rel-10
  • LTE-A LTE-Advanced
  • Reference in this regard may be made to 3 GPP TR 36.913, V9.0.0 (2009-12), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Requirements for Further Advancements for EUTRA (LTE-Advanced) (Release 9).
  • a goal of LTE-A is to provide significantly enhanced services by means of higher data rates and lower latency with reduced cost.
  • LTE-A is directed toward extending and optimizing the 3 GPP LTE Rel-8 radio access technologies to provide higher data rates at lower cost.
  • LTE-A will be a more optimized radio system fulfilling the ITU-R requirements for IMT -Advanced while keeping the backward compatibility with LTE Rel-8.
  • LTE-A should operate in spectrum allocations of different sizes, including wider spectrum allocations than those of LTE Rel-8 (e.g., up to 100MHz) to achieve the peak data rate of lOOMbit/s for high mobility and 1 Gbit/s for low mobility.
  • carrier aggregation is to be considered for LTE-A in order to support bandwidths larger than 20 MHz.
  • Carrier aggregation where two or more component carriers (CCs) are aggregated, is considered for LTE-A in order to support transmission bandwidths larger than 20MHz.
  • the carrier aggregation could be contiguous or non-contiguous. This technique, as a bandwidth extension, can provide significant gains in terms of peak data rate and cell throughput as compared to non-aggregated operation as in LTE Rel-8.
  • a terminal may simultaneously receive one or multiple component carriers depending on its capabilities.
  • a LTE-A terminal with reception capability beyond 20 MHz can simultaneously receive transmissions on multiple component carriers.
  • a LTE Rel-8 terminal can receive transmissions on a single component carrier only, provided that the structure of the component carrier follows the Rel-8 specifications.
  • LTE-A should be backwards compatible with Rel-8 LTE in the sense that a Rel-8 LTE terminal should be operable in the LTE-A system, and that a LTE-A terminal should be operable in a Rel-8 LTE system.
  • support for eight transmit and receive antenna ports up to 8-layer DL MIMO operation; support for enhanced MU-MIMO operation;
  • DMRS UE-specific demodulation reference symbols
  • CSI-RS periodic channel state information reference symbols
  • CoMP coordinated multi-point transmission/reception
  • CSI channel state information
  • UE feedback enhancements one issue relates to how to design efficient and unified UE feedback in support of both DL SU-MIMO and MU-MIMO, which are likely to be intrinsically tied together within the same DL transmission mode. Note that some form of CoMP may be included as well in Rel-10.
  • the CSI reports that the UE sends to the eNB give a direct recommendation for the DL transmission format (e.g. MCS/TBS, precoding weights for each antenna port, supportable transmission rank, etc.)
  • the DL transmission format e.g. MCS/TBS, precoding weights for each antenna port, supportable transmission rank, etc.
  • the basic principle, which builds on adaptive feedback methodology, is to specify two sets of codebooks instead of a single codebook, where one codebook represents the long term channel characteristics (referred to for convenience as Wl) and the other codebook (referred to for convenience as W2) describes the short term variations.
  • Wl long term channel characteristics
  • W2 the other codebook
  • the long term channel characteristics or long term CSI depict large scale fast-fading in a wideband fashion that depends primarily on transmit correlation at the eNB, and that does not necessarily depend on the transmission rank.
  • This is complemented by the short term CSI representing small scale fading in a frequency selective manner (with a granularity of from one up to a few PRBs), and which is typically rank specific (e.g., rank adaptation is performed at the UE on the short term part of the feedback).
  • the long term component can be decoupled from the short term one from an UE feedback reporting perspective, allowing to report the long term part with lower time periodicity, and hence it is possible to achieve efficient feedback compression and hence lower associated UL overhead
  • the rank of the channel refers to the number of independent spatial data streams that can be simultaneously transmitted between the antennas of the transmitter and receiver over a given radio channel resource.
  • the maximum achievable rank is the minimum between the number of transmit and receive antennas.
  • Such independent streams can be transmitted also in correlated scenarios under some circumstances, by employing cross polarized antennas at both the transmitter and receiver.
  • the polarization dimension creates an extra degree of freedom, allowing the system to transmit simultaneously up to two spatial streams, even in line-of-sight scenarios where typically the transmission rank is close to one in practice.
  • the rank of the radio channel indicates the number of layers that can be transmitted to the UE experiencing that radio channel.
  • W2 codebook supporting transmission ranks from 1 to 8.
  • the wideband part of the feedback becomes less significant and may be omitted (e.g. assuming an identity matrix for Wl) as there is no specific subspace/direction in the channel where to steer energy.
  • an exemplary embodiment of this invention provides a method for signaling support for MIMO CSI feedback.
  • the method includes composing, using a first CB, a self-contained first report including wideband long-term CSI. Sending the first report from a UE to a network access node is also included in the method.
  • the method also includes receiving from the network access node a grant to send a second report.
  • the grant includes an indication informing the UE how to premise the second report.
  • Composing, using a second CB, the second report including frequency selective short-term information is also included in the method.
  • the second report is composed premised on the indication received with the grant.
  • the method also includes sending the second report to the network access node.
  • an exemplary embodiment of this invention provides a method for signaling support for MIMO CSI feedback.
  • the method includes receiving a self-contained first report from a UE at a network access node.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB.
  • Sending, from the network access node to the UE, a grant to send a second report is also included in the method.
  • the grant includes an indication informing the UE how to premise the second report.
  • the method also includes receiving the second report from the UE at the network access node.
  • the second report is composed using a second CB. Deriving frequency selective short-term information from the second report based on the first report is also included in the method.
  • an exemplary embodiment of this invention provides an apparatus for signaling support for MIMO CSI feedback.
  • the apparatus includes at least one processor; and at least one memory including computer program code.
  • the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following: to compose, using a first CB, a self-contained first report including wideband long-term CSI; to send the first report from a UE to a network access node; to receive from the network access node a grant to send a second report; to compose, using a second CB, the second report including frequency selective short-term information; and to send the second report to the network access node.
  • the grant includes an indication informing the UE how to premise the second report and the second report is composed premised on the indication received with the grant.
  • an exemplary embodiment of this invention provides an apparatus for signaling support for MIMO CSI feedback.
  • the apparatus includes at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following: to receive a self-contained first report from a UE at a network access node; to send, from the network access node to the UE, a grant to send a second report; to receive the second report from the UE at the network access node.
  • the second report is composed using a second CB; and to derive frequency selective short-term information from the second report based on the first report.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB, the grant includes an indication informing the UE how to premise the second report and the second report is composed using a second CB.
  • an exemplary embodiment of this invention provides a computer readable medium for signaling support for MIMO CSI feedback.
  • the computer readable medium is tangibly encoded with a computer program executable by a processor to perform actions.
  • the actions include: composing, using a first CB, a self-contained first report including wideband long-term CSI; sending the first report from a UE to a network access node; receiving from the network access node a grant to send a second report; composing, using a second CB, the second report including frequency selective short-term information; and sending the second report to the network access node.
  • the grant includes an indication informing the UE how to premise the second report and the second report is composed premised on the indication received with the grant.
  • an exemplary embodiment of this invention provides a computer readable medium for signaling support for MIMO CSI feedback.
  • the computer readable medium is tangibly encoded with a computer program executable by a processor to perform actions.
  • the actions include receiving a self-contained first report from a UE at a network access node; sending, from the network access node to the UE, a grant to send a second report; receiving the second report from the UE at the network access node; and deriving frequency selective short- term information from the second report based on the first report.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB, the grant includes an indication informing the UE how to premise the second report and the second report is composed using a second CB
  • an exemplary embodiment of this invention provides an apparatus for signaling support for MIMO CSI feedback.
  • the apparatus includes means for composing, using a first CB, a self-contained first report including wideband long-term CSI.
  • Means for sending the first report from a UE to a network access node are also included.
  • the apparatus also includes means for receiving from the network access node a grant to send a second report.
  • the grant includes an indication informing the UE how to premise the second report.
  • Means for composing, using a second CB, the second report including frequency selective short-term information are also included.
  • the second report is composed premised on the indication received with the grant.
  • the apparatus also includes means for sending the second report to the network access node.
  • an exemplary embodiment of this invention provides an apparatus for signaling support for MIMO CSI feedback.
  • the apparatus includes means for receiving a self-contained first report from a UE at a network access node.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB.
  • Means for sending, from the network access node to the UE, a grant to send a second report are also included.
  • the grant includes an indication informing the UE how to premise the second report.
  • the apparatus also includes means for receiving the second report from the UE at the network access node.
  • the second report is composed using a second CB.
  • Means for deriving frequency selective short-term information from the second report based on the first report are also included.
  • Figure 1 reproduces Figure 4-1 of 3GPP TS 36.300, and shows the overall architecture of the
  • Figure 2 shows a simplified block diagram of various electronic devices that are suitable for use in practicing the exemplary embodiments of this invention
  • Figure 3 shows an exemplary timing relationship of Report- A and Report-B
  • Figure 4 is a logic flow diagram that illustrates the operation of a method, and a result of execution of computer program instructions embodied on a computer readable memory, in accordance with the exemplary embodiments of this invention.
  • Figure 5 is a logic flow diagram that illustrates the operation of a method, and a result of execution of computer program instructions embodied on a computer readable memory, further in accordance with the exemplary embodiments of this invention.
  • Various exemplary embodiments of this invention relate at least in part to the LTE -Advanced system which will be part of 3GPP LTE Rel-10, and more specifically relate to design aspects of downlink (DL) MIMO operation in LTE -Advanced, taking into account the extension to support 8 Tx antenna ports as well as enhanced Multi-User MIMO (MU-MIMO), which will be part of Rel-10 enhanced DL MIMO.
  • DL downlink
  • MU-MIMO enhanced Multi-User MIMO
  • the exemplary embodiments pertain to those UE signaling aspects required to support flexible, reliable and efficient DL single (SU) and multiuser (MU) MIMO operation in LTE Rel-10 (an beyond).
  • the short-term CSI report should preferably be the same as in Rel-8 (note that re-using Rel-8 codebooks would allow this), hence not including the long-term wideband part. Transmitting two separate reports on the other hand raises the problem that the UE and eNB might not have the same understanding about the long term CSI due to, e.g., uplink feedback channel errors.
  • UE report relative to the second codebook is conditioned on the UE report relative to the first codebook.
  • One example relates to the differential/refinement codebooks proposed in the above referenced Rl-100116, Rl-093867 and Rl-091288. These proposals aim at improving the channel state information knowledge at the eNB by improving the CSI provided by a codeword chosen from a base codebook. This is to be achieved by utilizing a differential/refinement codebook that is conditional on the base codeword.
  • the claimed benefit is an improved CSI with no increase in uplink overhead. Again, it can be noted that W2 is not self-contained: one needs information on both Wl and W2 in order to form the resulting transmit precoder
  • Wl and W2 should not be put in the same report: typically one would obtain the performance of an N-bit base codebook + N-bit differential codebook (or better) by utilizing just one 2N-bit codebook. Hence, the overhead reduction provided by such schemes is lost if the two codewords are placed in the same report. Rather one should, for example, time-multiplex between Wl and W2. However, this again raises the issue of the possibility of mismatched knowledge between the UE and eNB concerning Wl.
  • the approaches described above are a few non-limiting examples of possible UE feedback in support of DL SU-/MU-MIMO.
  • a goal of the feedback framework for LTE Rel-10 (and beyond) will be to increase the feedback accuracy itself.
  • the UE feedback with multiple CSI (PMI) /CQI reports is one generic way to achieve this goal.
  • the reports themselves may be possibly of different types and/or purposes, and may be self- contained or not.
  • Various exemplary embodiments of this invention pertain to signaling support for such modular UE feedback concepts with multiple CSI (PMI)/CQI reports, and more specifically pertain to how to make the two (or more) reports independent of one another, while preserving reliability, e.g., such that conditional CSI report(s) is (are) reported based on a correct assumption concerning the self-contained baseline report.
  • a wireless network 1 is adapted for communication over a wireless link 1 1 with an apparatus, such as a mobile communication device which may be referred to as a UE 10, via a network access node, such as a Node B (base station), and more specifically an eNB 12.
  • the network 1 may include a network control element (NCE) 14 that may include the MME/SGW functionality shown in Figure 1, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the internet).
  • NCE network control element
  • the UE 10 includes a controller, such as a computer or a data processor (DP) 10A, a computer-readable memory medium embodied as a memory (MEM) 10B that stores a program of computer instructions (PROG) IOC, and a suitable wireless interface, such as radio frequency (RF) transceiver 10D for bidirectional wireless communications with the eNB 12 via one or more antennas 11 A.
  • a controller such as a computer or a data processor (DP) 10A
  • MEM memory
  • PROG program of computer instructions
  • RF radio frequency
  • the eNB 12 also includes a controller, such as a computer or a data processor (DP) 12 A, a computer-readable memory medium embodied as a memory (MEM) 12B that stores a program of computer instructions (PROG) 12C, and a suitable wireless interface, such as RF transceiver 12D for communication with the UE 10 via a plurality of antennas 11B (e.g., possibly 8 Tx antennas).
  • the eNB 12 is coupled via a data/control path 13 to the NCE 14.
  • the path 13 may be implemented as the SI interface shown in Figure 1.
  • the eNB 12 may also be coupled to another eNB via data/control path 15, which may be implemented as the X2 interface shown in Figure 1.
  • the NCE 14 includes a controller, such as a computer or a data processor (DP) 14A, a computer-readable memory medium embodied as a memory (MEM) 14B that stores a program of computer instructions (PROG) 14C.
  • a controller such as a computer or a data processor (DP) 14A
  • DP data processor
  • MEM memory
  • PROG program of computer instructions
  • the UE 10 may be assumed to also include a MIMO feedback (FB) functionality 10E that operates in accordance with various exemplary embodiments of this invention, and the eNB 12 includes a MIMO feedback (FB) functionality 10E that operates in accordance with various exemplary embodiments of this invention, and the eNB 12 includes a MIMO feedback (FB) functionality 10E that operates in accordance with various exemplary embodiments of this invention, and the eNB 12 includes a MIMO feedback (FB) functionality 10E that operates in accordance with various exemplary embodiments of this invention, and the eNB 12 includes a MIMO feedback (FB) functionality 10E that operates in accordance with various exemplary embodiments of this invention, and the eNB 12 includes a FB feedback (FB) functionality 10E that operates in accordance with various exemplary embodiments of this invention, and the eNB 12 includes a FB feedback (FB) functionality 10E that operates in accordance with various exemplary embodiments of this invention, and the eNB 12 includes a FB feedback (FB) functionality 10E that operates
  • MIMO functionality 12E that is responsive to MIMO FB reporting received from the UE 10 as described below. It can also be assumed that the UE 10 and eNB 12 each store a copy of any relevant codebooks, such as the codebooks Wl and W2 10F and 12F shown as stored in the memories 10B and 12B, respectively.
  • At least the PROGs IOC and 12C are assumed to include program instructions that, when executed by the associated DP, enable the device to operate in accordance with various exemplary embodiments of this invention, as will be discussed below in greater detail. That is, various exemplary embodiments of this invention may be implemented at least in part by computer software executable by the DP 10A of the UE 10 and/or by the DP 12A of the eNB 12, or by hardware, or by a combination of software and hardware (and firmware).
  • the various embodiments of the UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication 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
  • portable computers having wireless communication 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.
  • the computer readable MEMs 10B and 12B 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, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the DPs 10A and 12A 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.
  • the wireless interfaces e.g., RF transceivers 10D and 12D
  • the signaling to enable a CSI/CQI reporting scheme assuming multiple and possibly different reports in support of DL SU-/MU-MIMO operation in, for example, LTE Rel-10 (and beyond).
  • the signaling scheme preserves the reliability in the signaling, e.g., the common understanding about the CSI between the eNB 12 and the UE 10.
  • CSI is to be understood in this context in a broad sense as including, for example, PMI and transmission rank (RI).
  • the exemplary embodiments provide a generic feedback signaling comprised of two reports (which can be referred to for convenience as Report-A and Report-B), and also provide DL control signaling to enable the combined usage of Report-A and Report-B that avoids issues with error propagation when one of the reports is erroneously received.
  • Report-A This first type of UE 10 report may be seen as a base report (with respect to other types of reports) on which the Report-B is conditioned. Report-A may be configured to be transmitted by the UE 10 over the UL. For example, in the non-limiting case of LTE Rel-10, several signaling alternatives for transmitting the report can include:
  • the CRC protection will most likely be applied; and aperiodically using the PUSCH-again in this case the Report-A will be most likely CRC protected.
  • the Report-A includes at least:
  • a corresponding wideband CQI assuming, e.g., open- loop rank-1 spatial multiplexing (e.g. via pre-defined precoder cycling) is performed over the short term codebook W2.
  • the UE 10 may still compute and report the corresponding CQI(s) under a predefined assumption on the other type(s) of report(s) which would make the entire Report-A self-contained.
  • a Report-A is a wideband CSI report representing long term channel characteristics.
  • the report based on the Wl codebook may also contain frequency selective information concerning CQI, PMI and RI.
  • this could present the baseline codeword as in the differential/refinement codebook schemes mentioned above (e.g., as presented in Rl- 100116, Rl-093867 and Rl-091288. referenced above).
  • the Report-B is conditioned upon Report-A and, hence, is not herein considered to be self- contained. It is requested by the eNB 12 on a per need basis (e.g., as an aperiodic CQI report).
  • the UE 10 derives Report-B under the hypothesis that the CSI from Report-A is being used as the transmit precoder at the eNB 12.
  • a non-limiting example for Report-B is to consider a frequency selective short term CSI report, as also mentioned in Rl- 100256 and Rl- 100051 dual codebook proposal.
  • the structure of this report may directly correspond to the Aperiodic CQI defined for LTE Rel-8.
  • new and larger 2-Tx and 4-Tx codebooks can be specified with a corresponding CSI report, but the principle remains the same as for LTE Rel-8.
  • a difference compared to LTE Rel- 8 is that the UE 10 calculates the short term report assuming that the eNB 12 uses Wl as the wideband precoder.
  • This approach may also be viewed as corresponding to codeword(s) chosen from a differential/refinement codebook, conditioned on the baseline codeword.
  • the DL control signaling supports the dual report operation in order to avoid error propagation in the case where the reception and/or decoding of the Report-A fails.
  • the eNB 12 sends to the UE 10 its current understanding of Report-A, and the UE 10 should then make its selection of Report-B based on this information. At least the following two cases can be distinguished:
  • Report-A is not CRC protected over the UL (e.g., as typically in the PUCCH case in the context of LTE).
  • the eNB 12 cannot know whether it has decoded the Report-A correctly.
  • the eNB 12 signals the CSI from Report-A (e.g., the long term PMI from the Wl codebook with an expected payload of 4-5 bits) explicitly to the UE 10 (e.g., in an UL grant that is used to trigger the sending of the Report-B, or by using some other mechanism).
  • Case B Report-A is CRC protected over the UL (e.g., as typically in the PUSCH case in the context of LTE).
  • the eNB 12 can determine if an error occurs upon reception of the Report-A.
  • the indication signaling can thus indicate to the UE 10 whether the last transmitted Report-A was correctly received by the eNB 12. If the reception of Report-A was successful, the UE 10 derives the Report-B under the assumption of the latest sent Report-A.
  • the UE 10 can assume the last correctly received Report-A is used in the calculation of Report-B (e.g., the last Report-A that was acknowledged as being correctly received by the eNB 12), or it can assume some predefined open-loop mechanism.
  • a predefined open- loop mechanism is to perform open- loop rank-1 spatial multiplexing over the short term codebook W2 (e.g. as in LTE Rel-8 via pre-defined precoder cycling) and report the corresponding CQI.
  • the latter applies to the combination of the reported Wl and implicit/pre-defined assumption on open-loop precoding over the codebook W2.
  • a predefined open-loop mechanism it is possible to report a wideband PMI from the W2 codebook explicitly in Report-A together with the long term channel properties from codebook Wl .
  • the reported CQI then applies to the combination of the reported Wl and wideband PMI from the W2 codebook leading to a self-contained Report-A.
  • Rl- 100256 and Rl- 100051 may be assumed to be in use, and the following example then is based on this (non- limiting) assumption.
  • Step 1 The eNodeB 12 configures via RRC signaling the UE 10 reporting parameters for both Report-A (e.g., periodic long term CSI/CQI report and corresponding PUCCH resources, or periodic or aperiodic PUSCH CQI, etc.) and Report-B (e.g., a Rel-8 similar aperiodic reporting mode).
  • Report-A e.g., periodic long term CSI/CQI report and corresponding PUCCH resources, or periodic or aperiodic PUSCH CQI, etc.
  • Report-B e.g., a Rel-8 similar aperiodic reporting mode
  • the UE 10 measures the DL channel from, e.g., the common RS and/or CSI-RS, derives the Report-A CSI. For example, this can include the long term CSI information in the form of the wideband PMI from the Wl codebook, and the corresponding CQI (e.g., wideband, assuming rank-1 open- loop precoding over the W2 codebook or an explicitly signaled assumption on the wideband PMI from the W2 codebook.
  • the UE 10 transmits Report-A to the eNodeB 12 over the UL (e.g., on the PUCCH resources given in the RRC configuration, or the PUSCH resources indicated in the aperiodic or periodic CQI procedure).
  • Step 3 The eNodeB 12 sends to the UE 10 a request to transmit Report-B (e.g., a command via PDCCH UL grant to transmit an aperiodic CSI report on the PUSCH resources indicated in the UL grant) together with one of the following: a. An explicit indication of the Report-A upon which to condition the requested Report-B
  • Report-B e.g., a command via PDCCH UL grant to transmit an aperiodic CSI report on the PUSCH resources indicated in the UL grant
  • Report-B The contents of Report-B are derived conditioned on the hypothesis on Report-A signaled earlier by eNodeB 12 together with its request for Report-B. For example, from the format point of view the report can be exactly the same as defined in LTE Rel-8. A difference is that the UE 10 assumes the eNodeB 12 will use the signaled information on the wideband PMI from the Wl codebook as assumed "base" precoder for the long term (e.g., wideband) precoding, while deriving the frequency selective short term CSI from the W2 codebook and associated CQI(s) for Report-B
  • Step 5 After receiving the Report-B the eNodeB 12 may combine the information from the Report-A and Report-B to derive the optimum precoding scheme and precode the downlink transmission accordingly.
  • steps 3, 4 and 5 may be repeated multiple times as shown in Figure 3, assuming that the update rate of Report-A is sufficiently low.
  • the structured and modular design makes the disclosed technique easy to standardize and implement.
  • the Report-A is usable also as a stand-alone report capable of providing good performance for a MU-MIMO or rank-1 SU-MIMO UE 10.
  • the Report-A can be seen as a direct enhancement to MU-MIMO (as in correlated scenarios it serves as a beam selector), hence enhancing the ability to provide improved MU-MIMO performance as compared to conventional single codebook based implicit (PMI-based) UE feedback in LTE Rel- 8.
  • signaling of the Wl information or the one-bit indicator in the PDCCH UL grant removes the possibility for error propagation due to erroneous reception of Report-A.
  • the use of the explicit signaling of Wl enables the eNB 12 to override the recommendation of the UE 10 regarding Wl when deemed necessary.
  • new aperiodic CSI formats are not needed to be defined for W2, as the existing (e.g., Rel-8) aperiodic CSI formats may be reused, assuming the long term precoder given in Report-A.
  • optimization of the short term feedback is possible by allowing improved Report-B definitions (for 2- and 4-Tx antenna configurations at the eNB 12).
  • the use of these exemplary embodiments has the significant benefit of maintaining the UE 10 CSI calculation latency budget at the same level as in LTE Rel-8, thereby avoiding a need to perform excessive computation operations to derive CSI.
  • FIG. 4 is a logic flow diagram that illustrates the operation of a method, and a result of execution of computer program instructions, in accordance with various exemplary embodiments of this invention.
  • a method performs, at Block 4A, a step of composing, using a first codebook, a self-contained first report comprising wideband long-term channel state information.
  • At Block 4B there is a step of sending the first report from a user equipment to a network access node.
  • these is a step of receiving from the network access node a grant to send a second report, where the grant is comprised of an indication of whether the first report was correctly received by the network access node.
  • Step 4D there is a step of composing, using a second codebook, the second report comprising frequency selective short-term information, where the second report is composed premised on the indication received with the grant.
  • Step 4E there is a step of sending the second report to the network access node.
  • the first report comprises an index pointing to a preferred wideband precoder (precoding matrix indicator) in the first codebook and a corresponding wideband channel quality indicator.
  • the wideband precoding matrix indicator is reported from the second codebook.
  • the reported channel quality indicator is based on an assumption on precoding matrix indicator(s) from the second codebook.
  • the first report comprises frequency selective information concerning the channel quality indicator, the precoding matrix indicator and a rank indicator.
  • the second report comprises a frequency selective short term channel state information report.
  • the structure of the second report directly corresponds to an aperiodic channel quality indicator defined for LTE Rel-8.
  • the information comprises a long term precoding matrix indicator.
  • the indication received with the grant comprises information specifying whether the last transmitted first report was correctly received by the network access node.
  • the second report is composed premised on information contained in the last transmitted first report, while if the information specifies that the last transmitted first report was not correctly received, then the second report is composed premised on information contained in a previously transmitted first report that the network access node has previously acknowledged as being correctly received.
  • Various exemplary embodiments of this invention also encompass a tangible computer- readable memory medium that stores computer software code comprised of instructions that, when executed by at least one data processor, result in performance of the various method steps described above with respect to Figure 4.
  • the computer-readable memory medium may be a non-transitory medium, for example, RAM, ROM, flash memory media, magnetic memory media, optical memory media, etc.
  • FIG. 5 is a logic flow diagram that illustrates the operation of a method, and a result of execution of computer program instructions, further in accordance with various exemplary embodiments of this invention.
  • a method performs, at Block 5A, a step of composing, using a first codebook, a self-contained first report comprising wideband long-term channel state information.
  • At Block 5B there is a step of sending the first report from a user equipment to a network access node.
  • these is a step of receiving from the network access node a grant to send a second report, where the grant is comprised of an indication of which codeword from the first codebook to assume when composing the second report.
  • Step 5D there is a step of composing, using a second codebook, the second report comprising frequency selective short-term information, where the second report is composed premised on the indication received with the grant.
  • Step 5E there is a step of sending the second report to the network access node.
  • An exemplary embodiment in accordance with this invention is a method for signaling support for MIMO CSI feedback.
  • the method includes composing (e.g., by a processor), using a first CB, a self-contained first report including wideband long-term CSI.
  • Sending e.g., by a transmitter
  • the first report from a UE to a network access node is also included in the method.
  • the method also includes receiving (e.g., by a receiver) from the network access node a grant to send a second report.
  • the grant includes an indication informing the UE how to premise the second report.
  • Composing e.g., by a processor
  • using a second CB the second report including frequency selective short-term information is also included in the method.
  • the second report is composed premised on the indication received with the grant.
  • the method also includes sending (e.g., by a transmitter) the second report to the network access node.
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the second report is composed premised on information provided in the first report.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • composing the second report is conditioned on an assumption that CSI that includes part of the first report is being used as a transmit precoder at the network access node.
  • the first report is sent with error detection/ correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQL
  • a preferred wideband precoder e.g., a PMI
  • the first report may assume open- loop rank-l spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report.
  • the structure of the second report may directly correspond to an aperiodic CQI.
  • the first report is sent without error detection/correction.
  • the indication received with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the first report is sent with error detection/correction.
  • the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node. If the information specifies that the last transmitted first report was correctly received, then the second report may be composed premised on information contained in the last transmitted first report, while if the information specifies that the last transmitted first report was not correctly received, then the second report may be composed premised on information contained in a previously transmitted first report that the network access node has previously acknowledged as being correctly received.
  • a plurality of grants are aperiodically received for triggering the UE to compose and send individual ones of a plurality of second reports to the network access node.
  • a further exemplary embodiment in accordance with this invention is a method for signaling support for MIMO CSI feedback.
  • the method includes receiving (e.g., by a receiver) a self- contained first report from a UE at a network access node.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB.
  • Sending e.g., by a transmitter
  • the grant includes an indication informing the UE how to premise the second report.
  • the method also includes receiving (e.g., by a receiver) the second report from the UE at the network access node.
  • the second report is composed using a second CB. Deriving (e.g., by a processor) frequency selective short-term information from the second report based on the first report is also included in the method.
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • the first report is received with error detection/ correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQI.
  • a preferred wideband precoder e.g., a PMI
  • the first report may assume open- loop rank-1 spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report.
  • the structure of the second report may directly correspond to an aperiodic CQI.
  • the first report is received without error detection/correction, and the indication sent with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the first report is sent with error detection/correction
  • the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node.
  • a further exemplary embodiment in accordance with this invention is an apparatus for signaling support for MIMO CSI feedback.
  • the apparatus includes at least one processor; and at least one memory including computer program code.
  • the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following: to compose, using a first CB, a self-contained first report including wideband long-term CSI; to send the first report from a UE to a network access node; to receive from the network access node a grant to send a second report; to compose, using a second CB, the second report including frequency selective short-term information; and to send the second report to the network access node.
  • the grant includes an indication informing the UE how to premise the second report and the second report is composed premised on the indication received with the grant.
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the at least one memory and the computer program code are further configured to cause the apparatus to compose the second report premised on information provided in the first report.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • the at least one memory and the computer program code are further configured to cause the apparatus to compose the second report conditioned on an assumption that CSI that includes part of the first report is being used as a transmit precoder at the network access node.
  • the at least one memory and the computer program code are further configured to cause the apparatus to send the first report with error detection/correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQL
  • a preferred wideband precoder e.g., a PMI
  • the first report may assume open- loop rank-l spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report. The structure of the second report may directly correspond to an aperiodic CQI.
  • the at least one memory and the computer program code are further configured to cause the apparatus to send the first report without error detection/correction, and the indication received with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the at least one memory and the computer program code are further configured to cause the apparatus to send the first report with error detection/correction, and the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node.
  • the at least one memory and the computer program code are further configured to cause the apparatus to compose the second report premised on information contained in the last transmitted first report if the information specifies that the last transmitted first report was correctly received.
  • the at least one memory and the computer program code are further configured to cause the apparatus to compose the second report premised on information contained in a previously transmitted first report that the network access node has previously acknowledged as being correctly received if the information specifies that the last transmitted first report was not correctly received.
  • the at least one memory and the computer program code are further configured to cause the apparatus to receive aperiodically, after the first report is sent, a plurality of grants for triggering the UE to compose and send individual ones of a plurality of second reports to the network access node.
  • the apparatus is embodied on an integrated circuit.
  • the apparatus includes at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following: to receive a self-contained first report from a UE at a network access node; to send, from the network access node to the UE, a grant to send a second report; to receive the second report from the UE at the network access node.
  • the second report is composed using a second CB; and to derive frequency selective short-term information from the second report based on the first report.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB, the grant includes an indication informing the UE how to premise the second report and the second report is composed using a second CB.
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • the at least one memory and the computer program code are further configured to cause the apparatus to receive the first report with error detection/correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQL
  • a preferred wideband precoder e.g., a PMI
  • the first report may assume open- loop rank-l spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report.
  • the structure of the second report may directly correspond to an aperiodic CQI.
  • the at least one memory and the computer program code are further configured to cause the apparatus to receive the first report without error detection/correction, and the indication sent with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the at least one memory and the computer program code are further configured to cause the apparatus to send the first report with error detection/correction, and the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node.
  • the at least one memory and the computer program code are further configured to cause the apparatus to aperiodically send, after the first report is received, a plurality of grants for triggering the UE to compose and send individual ones of a plurality of second reports to the network access node.
  • the apparatus is embodied on an integrated circuit.
  • a further exemplary embodiment in accordance with this invention is a computer readable medium for signaling support for MIMO CSI feedback.
  • the computer readable medium is tangibly encoded with a computer program executable by a processor to perform actions.
  • the actions include: composing, using a first CB, a self-contained first report including wideband long-term CSI; sending the first report from a UE to a network access node; receiving from the network access node a grant to send a second report; composing, using a second CB, the second report including frequency selective short-term information; and sending the second report to the network access node.
  • the grant includes an indication informing the UE how to premise the second report and the second report is composed premised on the indication received with the grant.
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the second report is composed premised on information provided in the first report.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • composing the second report is conditioned on an assumption that CSI that includes part of the first report is being used as a transmit precoder at the network access node.
  • the first report is sent with error detection/correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQI.
  • the first report may assume open- loop rank-1 spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report.
  • the structure of the second report may directly correspond to an aperiodic CQI.
  • the first report is sent without error detection/correction, and the indication received with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the first report is sent with error detection/correction
  • the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node. If the information specifies that the last transmitted first report was correctly received, then the second report may be composed premised on information contained in the last transmitted first report, while if the information specifies that the last transmitted first report was not correctly received, then the second report may be composed premised on information contained in a previously transmitted first report that the network access node has previously acknowledged as being correctly received.
  • a plurality of grants are aperiodically received for triggering the UE to compose and send individual ones of a plurality of second reports to the network access node.
  • the computer readable media is a non-transitory computer readable media (e.g., ROM, RAM, flash media, etc.).
  • a further exemplary embodiment in accordance with this invention is a computer readable medium for signaling support for MIMO CSI feedback.
  • the computer readable medium is tangibly encoded with a computer program executable by a processor to perform actions.
  • the actions include receiving a self-contained first report from a UE at a network access node; sending, from the network access node to the UE, a grant to send a second report; receiving the second report from the UE at the network access node; and deriving frequency selective short- term information from the second report based on the first report.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB
  • the grant includes an indication informing the UE how to premise the second report and the second report is composed using a second CB
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • the first report is received with error detection/correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQI.
  • the first report may assume open- loop rank-1 spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report.
  • the structure of the second report may directly correspond to an aperiodic CQI.
  • the first report is received without error detection/correction, and the indication sent with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the first report is sent with error detection/correction
  • the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node.
  • a plurality of grants are aperiodically sent for triggering the UE to compose and send individual ones of a plurality of second reports to the network access node.
  • the computer readable media is a non-transitory computer readable media (e.g., ROM, RAM, flash media, etc.).
  • Another exemplary embodiment in accordance with this invention is an apparatus for signaling support for MIMO CSI feedback.
  • the apparatus includes means for composing (e.g., a processor), using a first CB, a self-contained first report including wideband long-term CSI.
  • Means for sending (e.g., a transmitter) the first report from a UE to a network access node are also included.
  • the apparatus also includes means for receiving (e.g., a receiver) from the network access node a grant to send a second report.
  • the grant includes an indication informing the UE how to premise the second report.
  • Means for composing e.g., a processor), using a second CB, the second report including frequency selective short-term information are also included.
  • the second report is composed premised on the indication received with the grant.
  • the apparatus also includes means for sending (e.g., a transmitter) the second report to the network access node.
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the second report is composed premised on information provided in the first report.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • composing the second report is conditioned on an assumption that CSI that includes part of the first report is being used as a transmit precoder at the network access node.
  • the first report is sent with error detection/ correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQI.
  • the first report may assume open- loop rank-1 spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report.
  • the structure of the second report may directly correspond to an aperiodic CQI.
  • the first report is sent without error detection/correction, and the indication received with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the first report is sent with error detection/correction
  • the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node. If the information specifies that the last transmitted first report was correctly received, then the second report may be composed premised on information contained in the last transmitted first report, while if the information specifies that the last transmitted first report was not correctly received, then the second report may be composed premised on information contained in a previously transmitted first report that the network access node has previously acknowledged as being correctly received.
  • a plurality of grants are aperiodically received for triggering the UE to compose and send individual ones of a plurality of second reports to the network access node.
  • a further exemplary embodiment in accordance with this invention is an apparatus for signaling support for MIMO CSI feedback.
  • the apparatus includes means for receiving (e.g., a receiver) a self-contained first report from a UE at a network access node.
  • the first report includes wideband long-term CSI and the first report is composed using a first CB.
  • Means for sending (e.g., a transmitter), from the network access node to the UE, a grant to send a second report are also included.
  • the grant includes an indication informing the UE how to premise the second report.
  • the apparatus also includes means for receiving (e.g., a receiver) the second report from the UE at the network access node.
  • the second report is composed using a second CB.
  • Means for deriving (e.g., a processor) frequency selective short-term information from the second report based on the first report are also included.
  • the indication is an indication of whether the first report was correctly received by the network access node.
  • the indication is an indication of which codeword from the first CB to assume when composing the second report.
  • the first report is received with error detection/correction.
  • the first report includes an index pointing to a preferred wideband precoder (e.g., a PMI) in the first CB and a corresponding wideband CQL
  • a preferred wideband precoder e.g., a PMI
  • the first report may assume open- loop rank-l spatial multiplexing is performed over the second CB.
  • the wideband PMI may be reported from the second CB.
  • a reported CQI is based on an assumption on at least one PMI from the second CB.
  • the first report includes frequency selective information concerning a CQI, the PMI and a RI.
  • the first report presents a baseline codeword in a differential/refinement CB.
  • the second report includes a frequency selective short term CSI report.
  • the structure of the second report may directly correspond to an aperiodic CQI.
  • the first report is received without error detection/correction, and the indication sent with the grant includes information that formed a part of the first report.
  • the information may include a long term PMI.
  • the first report is sent with error detection/correction
  • the indication received with the grant includes information specifying whether the last transmitted first report was correctly received by the network access node.
  • a plurality of grants are aperiodically sent for triggering the UE to compose and send individual ones of a plurality of second reports to the network access node.
  • an aspect of various exemplary embodiments of this invention is an apparatus that comprises a processor and a memory including computer program code.
  • the memory and computer program code are configured to, with the processor, cause the apparatus at least to perform composing, using a first codebook, a self-contained first report comprising wideband long-term channel state information; sending the first report from a user equipment to a network access node; receiving from the network access node a grant to send a second report, where the grant is comprised of an indication of whether the first report was correctly received by the network access node; composing, using a second codebook, the second report comprising frequency selective short-term information, where the second report is composed premised on the indication received with the grant; and sending the second report to the network access node.
  • an aspect of various exemplary embodiments of this invention is an apparatus that comprises means for composing, using a first codebook, a self- contained first report comprising wideband long-term channel state information; means for sending the first report from the apparatus to a network access node; means for receiving from the network access node a grant to send a second report, where the grant is comprised of an indication of whether the first report was correctly received by the network access node; means for composing, using a second codebook, the second report comprising frequency selective short-term information, where the second report is composed premised on the indication received with the grant; and means for sending the second report to the network access node
  • 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.
  • aspects of various exemplary embodiments of this invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • 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 configurable so as to operate in accordance with various exemplary embodiments of this invention.
  • 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 connections, 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.
  • the various names assigned to different channels e.g., PUCCH, PUSCH, PDCCH, etc. are not intended to be limiting in any respect, as these various channels may be identified by any suitable names.

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

Abstract

L'invention concerne un procédé de prise en charge d'une signalisation pour retour d'informations CSI (Channel State Information pour Informations d'état des canaux) entrée multiple sortie multiple (MIMO). Le procédé consiste (4A) à composer, en utilisant un premier livre de codes (CB), un premier rapport autonome contenant des informations CSI à long terme à large bande; (4B) à envoyer le premier rapport depuis un équipement utilisateur (UE) vers un nœud d'accès au réseau; (4C) à recevoir du nœud d'accès au réseau un accord d'envoi d'un second rapport, l'accord contenant une indication informant l'UE de la façon dont le second rapport doit être configuré; (4D) à composer, en utilisant un second CB, le second rapport contenant des informations à court terme de sélectivité en fréquence, le second rapport étant composé sur la base d'une indication reçue avec les accords; et (4E) à envoyer le second rapport au nœud d'accès au réseau. L'invention concerne également un appareil et des supports lisibles par ordinateur.
PCT/FI2011/050114 2010-02-12 2011-02-09 Support de signalisation pour retour d'informations d'état de canaux mimo WO2011098670A1 (fr)

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EP2556638A4 (fr) * 2010-04-06 2013-11-06 Nokia Corp Conception et structure de livre de codes pour retour d'information à granularité multiple
EP2556638A1 (fr) * 2010-04-06 2013-02-13 Nokia Corp. Conception et structure de livre de codes pour retour d'information à granularité multiple
US8743992B2 (en) 2010-04-06 2014-06-03 Nokia Corporation Codebook design and structure for multi-granular feedback
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WO2014035101A1 (fr) * 2012-08-26 2014-03-06 엘지전자 주식회사 Procédé et appareil de transmission d'un signal basé sur un livre de codes dans un système de communication sans fil
WO2014035102A1 (fr) * 2012-08-26 2014-03-06 엘지전자 주식회사 Procédé et appareil de transmission d'un signal basé sur un livre de codes dans un système de communication sans fil
WO2014052806A1 (fr) * 2012-09-28 2014-04-03 Interdigital Patent Holdings, Inc. Communications sans fil au moyen d'une configuration d'antennes multidimensionnelles
JP2017139804A (ja) * 2012-09-28 2017-08-10 インターデイジタル パテント ホールディングス インコーポレイテッド 多次元アンテナ構成を使用する無線通信
US9918240B2 (en) 2012-09-28 2018-03-13 Interdigital Patent Holdings, Inc. Wireless communication using multi-dimensional antenna configuration
JP2015536099A (ja) * 2012-09-28 2015-12-17 インターデイジタル パテント ホールディングス インコーポレイテッド 多次元アンテナ構成を使用する無線通信
US9401752B2 (en) 2012-10-22 2016-07-26 Zte Corporation Method and device for performing codebook processing on channel information
WO2013167018A1 (fr) * 2012-10-22 2013-11-14 中兴通讯股份有限公司 Procédé et dispositif pour exécuter un traitement par livre de codes sur des informations de canal
CN110383710A (zh) * 2017-03-09 2019-10-25 三星电子株式会社 高级无线通信***中的协方矩阵反馈的方法和装置
CN110383710B (zh) * 2017-03-09 2023-10-20 三星电子株式会社 高级无线通信***中的协方矩阵反馈的方法和装置
WO2018201904A1 (fr) * 2017-05-05 2018-11-08 中兴通讯股份有限公司 Procédé de détermination d'un paramètre de transmission en liaison montante, procédé et dispositif de transmission d'informations de configuration
US11616543B2 (en) 2017-05-05 2023-03-28 Zte Corporation Method for determining uplink transmission parameters and method and device for transmitting configuration information
CN108112075B (zh) * 2017-05-05 2023-05-02 中兴通讯股份有限公司 上行传输参数的确定方法及配置信息的发送方法
CN108112075A (zh) * 2017-05-05 2018-06-01 中兴通讯股份有限公司 上行传输参数的确定方法及配置信息的发送方法
US10992360B2 (en) 2019-01-28 2021-04-27 Apple Inc. Feedback overhead reduction for precoders under high rank spatial channels
US11695461B2 (en) 2019-01-28 2023-07-04 Apple Inc. Feedback overhead reduction for precoders under high rank spatial channels

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