METHOD FOR REPORTING CHANNEL STATUS INFORMATION IN WIRELESS COMMUNICATION SYSTEM AND APPLIANCE FOR T

专利摘要:
the present invention provides a method of communication, by a eu, csi in a wireless communication system, the method comprising: receiving, from a base station, an rrc signaling comprising a plurality of report settings, in which each setting report comprises a corresponding list of first values that represent time deviations for transmitting a CSI report, forming a plurality of lists of first values; receiving, from the base station, dci that triggers the CSI report, where the ICD comprises an index value related to a time in which to transmit the CSI report in a pusch; determine, based on dci, a plurality of list entries; determining a second value that is greater among the plurality of list entries; and transmit, to the base station, the CSUS pusch report based on the second value.
公开号:BR112019008357B1
申请号:R112019008357-0
申请日:2018-11-27
公开日:2020-03-24
发明作者:Hyungtae Kim；Jiwon Kang
申请人:Lg Electronics Inc.；
IPC主号:

专利说明:

“METHOD FOR REPORTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR THE SAME” [Technical Field] [001] The present invention relates to wireless communications and, more particularly, to a method for reporting Information Channel State (CSI) and a device to support the method.
[Background Technique] [002] Mobile communication systems have generally been developed to provide voice services, ensuring user mobility. Such mobile communication systems have gradually expanded their coverage of voice services, through data services and high-speed data services. However, as current mobile communication systems suffer from resource scarcity and users demand even higher speed services, it is necessary to develop more advanced mobile communication systems.
[003] State-of-the-art mobile communication system requirements may include support for massive data traffic, a notable increase in the throughput of each user, accommodation for a significantly larger number of connection devices, end-to-end latency very low, and high power efficiency. To this end, various techniques, such as small cell enhancement, dual connectivity, multiple input and multiple output (MIMO), full-band duplex, non-orthogonal multiple access (NOMA), super broadband support and device network, were researched .
[Disclosure] [Technical Problem] [004] The present invention provides a method for determining a partition deviation associated with a CSI report when a plurality of report settings are triggered by DCI.
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2/89 [005] The technical objects of the present invention are not limited to the technical objects mentioned above, and other technical objects, which are not mentioned above, will apparently be appreciated by a person skilled in the art from the following description.
[Technical Solution] [006] This document provides a method for transmitting and receiving a CSI-RS in a wireless communication system.
[007] More specifically, a method performed by a user equipment (UE) comprises receiving, from a base station, a radio resource control (RRC) signaling comprising a plurality of reporting settings, in which each configuration of report comprises a corresponding list of first values that represent time deviations for transmitting a CSI report, forming a plurality of lists of first values; receive, from the base station, downlink control (DCI) information that triggers the CSI report, where the DCI comprises an index value related to a time in which it transmits the CSI report on a shared physical uplink channel (PUSCH); determine, based on the DCI, a plurality of list entries by determining, for each list in the plurality of first value lists, a corresponding list entry that is indexed in the list based on the index value; determining a second value that is greater among the plurality of list entries; and transmit, to the base station, the CSI report on the PUSCH based on the second value.
[008] Furthermore, according to the present invention, the CSI report comprises an aperiodic CSI report.
[009] In addition, according to the present invention, receiving the DCI comprises receiving the DCI on an n partition, and transmitting the CSI report comprises transmitting the CSI report on an n + partition (second value).
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3/89 [010] In addition, according to the present invention, the index value is represented by 2 bits, and the index value is represented by one of 00, 01, 10 or
11.
[011] Furthermore, according to the present invention, the index value of 00 corresponds to a first entry in each of the plurality of lists of first values, the index value of 01 corresponds to a second entry in each of the plurality of first value lists, the index value of 10 corresponds to a third entry in each of the plurality of first value lists, and index value 11 corresponds to a fourth entry in each of the plurality of first value lists .
[012] In addition, according to the present invention, the index value is greater than or equal to zero, and each list entry is indexed in the corresponding list of the first values in a position corresponding to 1+ (index value) in list.
[013] Also, a user equipment (UE) configured to report channel status information (CSI) in a wireless communication system, the UE comprising: a radio frequency (RF) module; at least one processor; and at least one computer memory operably connectable to at least one processor and storing instructions that, when executed, cause at least one processor to perform operations comprising: receiving from a base station, a radio resource control signal (RRC) which comprises a plurality of report settings, each report configuration comprising a corresponding list of the first values that represent time deviations for transmitting a CSI report, forming a plurality of first value lists; receive, from the base station, downlink control (DCI) information that triggers the CSI report, where the DCI comprises an index value related to a time in which to transmit the CSI report on a shared physical uplink channel (PUSCH) ); determine, based on
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4/89 in the DCI, a plurality of list entries determining, for each list in the plurality of first value lists, a corresponding list entry that is indexed in the list based on the index value; determining a second value that is greater among the plurality of list entries; and transmit, to the base station, the CSI report on the PUSCH based on the second value.
[Advantageous Effects] [014] According to the present invention, when a plurality of report adjustments are triggered by DCI, a larger value between the partition deviation values (associated with a CSI report included in each report configuration) corresponding to the DCI is defined as a partition deviation associated with the CSI report and, as a result, a UE can normally run the CSI report.
[015] The advantages that can be obtained in the present invention are not limited to the effects mentioned above and other advantages not mentioned will be clearly understood by those skilled in the art from the description that follows.
[Description of Drawings] [016] The accompanying drawings, which are included here as part of detailed descriptions to help understand the present invention, provide modalities of the present invention and describe technical features of the present invention with detailed descriptions below.
[017] FIG. 1 illustrates an example of the general structure of an NR system to which a method proposed by the present specification can be applied.
[018] FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which a method proposed by the present specification can be applied.
[019] FIG. 3 illustrates an example of a resource grid supported by a
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5/89 wireless communication system to which a method proposed by this specification can be applied.
[020] FIG. 4 illustrates an example of an independent subframe structure, to which a method proposed by the present specification can be applied.
[021] FIG. 5 illustrates a model of transceiver unit in a wireless communication system to which the present invention can be applied.
[022] FIG. 6 is a flow diagram illustrating an example of a CSI-related procedure.
[023] FIG. 7 illustrates an example of the timing at which a periodic CSI-RS is received.
[024] FIGS. 8 and 9 illustrate another example of the timing at which a periodic CSIRS is received.
[025] FIG. 10 illustrates an example of a method for measuring CSI using a CSI-RS AP.
[026] FIG. 11 illustrates an example of another method for measuring CSI using an AP CSI-RS.
[027] FIG. 12 illustrates an example of a single A-CSI to CSI reporting trigger proposed by the present specification.
[028] FIG. 13 illustrates an example of a single A-CSI reporting trigger having a periodic CSI-RS proposed by the present specification.
[029] FIGs. 14 and 15 illustrate examples of a method for determining a time shift of a CSI reference resource proposed by the present specification.
[030] FIG. 16 illustrates a single A-CSI to CSI reporting trigger having an aperiodic CSI-RS proposed by the present invention.
[031] FIG. 17 is a flow chart illustrating an example of a method of
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6/89 operation of a UE that performs a CSI report proposed by the present invention.
[032] FIG. 18 is a flow chart illustrating an example of a method of operating an eNB that receives a CSI report proposed by the present invention.
[033] FIG. 19 illustrates a block diagram of a wireless communication device to which the methods proposed in the present invention can be applied.
[034] FIG. 20 illustrates a block diagram of a communication device according to an embodiment of the present invention.
[035] FIG. 21 is a diagram illustrating an example of an RF module of the wireless communication device to which the method proposed in the present invention can be applied.
[036] FIG. 22 is a diagram illustrating another example of the RF module of the wireless communication device to which the method proposed in the present invention can be applied.
[Best Modes] [037] In the following, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed descriptions to be disclosed below, with reference to the accompanying drawings, are intended to describe illustrative embodiments of the present invention, but are not intended to represent the only embodiment of the present invention. Detailed descriptions below include specific details to provide a complete understanding of the present invention. However, it will be understood by those skilled in the art that the present invention can be realized without the specific details to be introduced.
[038] In some cases, in order to avoid obscuring the essence of this
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7/89 invention, well-known structures and devices can be omitted or can be represented in the form of a block diagram in relation to the central functions of each structure and device.
[039] A base station in this document is considered to be a terminal node of a network, which communicates directly with a UE. In this document, certain operations considered performed by the base station can be performed by an upper node of the base station, depending on the situations. In other words, it is evident that in a network consisting of a plurality of network nodes including a base station, various operations performed for communication with a UE can be performed by the base station or by network nodes other than the base station. The term Base Station (BS) can be replaced by a term such as fixed station, Node B, evolved Node B (eNB), Base Transceiver System (BTS), Access Point (AP) or general NB (gNB). In addition, a terminal can be fixed or mobile; and the term can be replaced by a term such as User Equipment (UE), Mobile Station (MS), User Terminal (UT), Mobile Subscriber Station (MSS), Subscriber Station (SS), Advanced Mobile Station (AMS ), Wireless Terminal (WT), machine type communication device (MTC), machine to machine device (M2M) or device to device device (D2D).
[040] In the following, downlink (DL) refers to the communication from a base station to a terminal, while uplink (UL) refers to the communication from a terminal to a base station. In downlink transmission, a transmitter can be part of the base station and a receiver can be part of the terminal. Likewise, in uplink transmission, a transmitter can be part of the terminal and a receiver can be part of the base station.
[041] The specific terms used in the following descriptions are introduced to help understand the present invention, and the terms
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8/89 can be used in different ways, as long as it does not fall outside the technical scope of the present invention.
[042] The technology described below can be used for various types of wireless access systems based on Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) , Multiple Access by Orthogonal Frequency Division (OFDMA) Multiple Access by Single Carrier Frequency Division (SCFDMA) or Non-Orthogonal Multiple Access (NOMA). CDMA can be implemented by radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by radio technology such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS) or Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20 or UTRA Evolved (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The Long Term Evolution (LTE) of the 3 ^â Generation Partnership Project (3GPP) is part of the Evolved UMTS (E-UMTS) that uses E-UTRA, employing OFDMA for downlink and SCFDMA for uplink transmission. LTE-A (Advanced) is an evolved version of the 3GPP LTE system.
[043] The 5G NR defines improved Mobile Broadband (eMBB), Massive Machine Type Communication (mMTC), Ultra-Reliable and Low Latency Communication (URLLC) and Vehicle for Everything (V2X), depending on the usage scenarios.
[044] And the 5G NR standard is divided into autonomous (SA) and non-autonomous (NSA) modes according to the coexistence between the NR system and the LTE system.
[045] And the 5G NR supports multiple subcarrier spacing and supports CP-OFDM for downlink transmission while CP-OFDM and DFT-s-OFDM (SCPetition 870190038964, 25/04/2019, p. 17/122
9/89
OFDM) for uplink transmission.
[046] The modalities of the present invention can be supported by standard documents disclosed for at least one of the wireless access systems, such as IEEE 802, 3GPP and 3GPP2. In other words, those steps or portions between modalities of the present invention not described to clearly illustrate the technical principles of the present invention can be supported by the documents mentioned above. In addition, all terms disclosed in this document can be described by the standard documents mentioned above.
[047] For the sake of clarity, the descriptions are given mainly with respect to 3GPP LTE / LTE-A, but the technical characteristics of the present invention are not limited to the specific system.
Definition of Terms [048] eLTE eNB: An eLTE eNB is an evolution of an eNB that supports a connection to an EPC and an NGC.
[049] gNB: A node to support NR in addition to a connection to an NGC [050] New RAN: A radio access network that supports NR or E-UTRA or interacts with an NGC [051] Network slice: A slice network is a network defined by an operator to provide an optimized solution for a specific market scenario that requires a specific requirement together with an interterminal interval.
[052] Network function: A network function is a logical node in an infra network that has a well-defined external interface and a well-defined functional operation.
[053] NG-C: A control plane interface used for the NG2 reference point between the new RAN and an NGC [054] NG-U: A user plane interface used for the
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10/89 NG3 reference between the new RAN and a non-autonomous NGC [055] NR: A deployment configuration in which a gNB requires an LTE eNB as an anchor for a control plan connection with an EPC or requires an eNB eLTE as an anchor for a control plane connection to an NGC [056] non-autonomous E-UTRA: An eLTE eNT deployment configuration requires a gNB as an anchor for a control plane connection to an NGC.
[057] User plane gateway: an end point of the NG-U interface [058] [059] Numerology: corresponds to a subcarrier spacing in the frequency domain. Different numerology can be defined by scaling the spacing of the reference subcarrier by an integer N.
[060] NR: NR Radio Access or New Radio
General System [061] FIG. 1 is a diagram illustrating an example of an overall structure of a new radio system (NR) for which a method proposed by the present disclosure can be implemented.
[062] Referring to FIG. 1, an NG-RAN is composed of gNBs that provide an NG-RA user plan (new AS / PDCP / RLC / MAC / PHY sublayer) and a control plan protocol (RRC) terminal for a UE (User Equipment ).
[063] The gNBs are connected to each other via an Xn interface.
[064] The gNBs are also connected to an NGC via an NG interface.
[065] More specifically, gNBs are connected to an Access and Mobility Management Function (AMF) through an N2 interface and a
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User Plan Function (UPF) through an N3 interface.
Numerology of NR (Nova Rat) and and frame structure [066] In the NR system, several numerologies can be supported. Numerologies can be defined by the spacing of the subcarrier and a CP overhead (cyclic prefix). The spacing between the plurality of subcarriers can be derived by scaling the basic subcarrier spacing into an integer N (or ^μ ). In addition, although it is assumed that a very low subcarrier spacing is not used at a very high subcarrier frequency, a numerology to be used can be selected independently of a frequency band.
[067] In addition, in the NR system, a variety of frame structures according to the multiple numerologies can be supported.
[068] In the following, an Orthogonal Frequency Division Multiplexing (OFDM) numerology and a frame structure, which can be considered in the NR system, will be described.
[069] A plurality of OFDM numerologies supported in the NR system can be defined as in Table 1.
[Table 1] _________________________________________________
μ Af = 2 ^μ · 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, Extended 3 120 Normal 4 240 Normal 5 480 Normal
[070] In relation to a frame structure in the NR system, a size of several fields in the time domain is expressed as a multiple of a time unit of = V (Vmax • Wf). In this case, 4 / max = 480-10 and ^N f = 4096. the DL and UL transmission is configured as a radio frame with a section of = (Vmax ^ f / l ° ⁰ ) · ^ = 10 ms. the radio board is composed of ten subframes,
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12/89 each with a section of / ⁼ ( ^/ V _ma x ^ fΛθθθ) · ^ ^{= lms} . In this case, there may be a set of UL frames and a set of DL frames.
[071] FIG. 2 illustrates a relationship between a UL board and a DL board in a wireless communication system to which a method proposed by the present disclosure can be implemented.
[072] As illustrated in FIG. 2, a UL I frame number of a User Equipment (UE) needs to be transmitted ^ ta 44 before the start of a corresponding DL frame in the UE.
[073] Regarding μ numerology, partitions are numbered in order μ ir slots, μ _ 1 I increasing s (. '***' subframe J in a subframe, and in increasing order η ^μ g ίθ / / ^slots -. "_ 1I
V = v '** ^v frame u in a radio frame. A partition is made up of symbols v and N ^ft
Svmb continuous OFDM, and is determined depending on a numerology in use and partition configuration. The beginning of ⁿ '“partitions in a subframe is η ^μ Ν ^μ temporarily aligned with the beginning of the OFDM symbols ^ss y ^mb in the same subframe.
[074] Not all UEs are capable of transmitting and receiving at the same time, and this means that not all OFDM symbols on a DL partition or an UL partition are available for use.
[075] Table 2 shows the number of OFDM symbols per partition for a normal CP in numerology, and Table 3 shows the number of OFDM symbols per partition for an extended CP in numerology.
[Table 2]
μ Partition configuration0N slot ^ ’frame N slots, μ’Subframe1 N slots ^ ^N frame N slots, μ ^N subframe 0 14 10 1 7 20 2 1 14 20 2 7 40 4 2 14 40 4 7 80 8 3 14 80 8 - - - 4 14 160 16 - - - 5 14 320 32 - - -
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13/89 [Table 3]
μ Partition configuration0N slot ^ ’frame N slots, μ’Subframe1 N βίοΐίβμ ^N frame N slots, μ ^N subframe 0 12 10 1 6 20 2 1 12 20 2 6 40 4 2 12 40 4 6 80 8 3 12 80 8 - - - 4 12 160 16 - - - 5 12 320 32 - - -
NR Physical Resource [076] Regarding physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. can be considered.
[077] From now on, the physical resources above possible to be considered in the NR system will be described in more detail.
[078] First, in relation to an antenna port, the antenna port is defined in such a way that a channel through which a symbol in an antenna port is transmitted can be inferred from another channel through which a symbol in it antenna port is transmitted. When large-scale properties of a channel are received and a symbol on one antenna port can be inferred from another channel through which a symbol on another antenna port is transmitted, the two antenna ports can be in a QC / QCL relationship (almost co-located or almost co-located). Here, large-scale properties can include at least one delay spread, Doppler spread, Doppler shift, average gain and average delay.
[079] FIG. 3 illustrates an example of a resource grid supported in a wireless communications system to which a method proposed by the present disclosure can be implemented.
[080] Referring to FIG. 3, a resource grid is made up of
N ^μ N ^{RB RB sc} subcarriers in a frequency domain, each subframe composed of
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14/89 OFDM symbols of 14.2 μ, but the present disclosure is not limited to these.
[081] In the NR system, a transmitted signal is described by one or more n ^μ N ^RB 2 ^μ N ^μ networks of resources, composed of ^{RB sc} subcarriers, and ^symb OFDM symbols. Here n μ <n ^max 'μ N ^max ' ^{μ N} rb < ^N rb. the above ^Vrb indicates the maximum transmission bandwidth, and can change not only between numerologies, but between UL and DL.
[082] In this case, as illustrated in FIG. 3, a resource grid can be configured for μ numerology and an antenna port p.
[083] Each element of the resource grid for numerology μ and the antenna port p is indicated as a resource element and can be identified k_o N μ n RB_i exclusively by a pair of indices. Here, = ^{N RB N sc 1} is an index in the frequency domain and = θ ''' ^{2 Nsymb 1} indicates a location of a symbol in a subframe. To indicate a resource element in a partition, the index pair ^(k , is used. Here in, ¹ θ ····· ^Ν > η / '1.
[084] The resource element ^(k 'for numerology μ and the antenna port a ^(ρ - ^μ) p corresponds to a complex value ^k , ^1. When there is no risk of confusion or when a specific antenna port or numerology is specified, the indices p and μ can be discarded, and thus the complex value can become or _kr .
[085] In addition, a block of physical resources is defined as NsRB = 12 continuous subcarriers in the frequency domain. In the frequency domain, the n μ - i blocks of physical resources can be numbered from 0 to ^{RB -} . At this point, a relationship between the physical resource block number ^w prb and the resource elements ^(k , ^l ) can be given as in Equation 1.
[Equation 1] ⁿ PRB k
n ^rb sc [086] In addition, in relation to a carrier part, a UE can be configured to receive or transmit the carrier part using only a subset of a resource grid. At this point, a set of blocks of
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15/89 resources that the UE is configured to receive or transmit are numbered 0 n ^μ - 1 a in the frequency region.
Independent Subframe Structure [087] FIG. 4 is a diagram illustrating an example of an independent subframe structure in a wireless communications system for which the present disclosure can be implemented.
[088] In order to minimize data transmission latency in a TDD system, the new RAT 5G considers an independent subframe structure as shown in FIG. [089] In FIG. 4, a diagonal line area (symbol index 0) represents a UL control area, and a black area (symbol index 13) represents a UL control area. A non-shaded area can be used for DL data transmission or for UL data transmission. This structure is characterized by the fact that DL transmission and UL transmission are performed sequentially in a subframe and, therefore, DL data transmission and ACK / NACK UL reception can be performed in the subframe. In conclusion, it is possible to reduce the data retransmission time in the event of a data transmission error and, thus, minimize the latency of the final data transmission.
[090] In this independent subframe structure, a time interval is required for a base station or UE to change from a transmission mode to a receive mode or to change from a reception mode to a transmission mode. For this purpose, some OFDM symbols at a point in the switching time from DL to UL in the independent subframe structure are configured as a guard period (GP).
Analog Beam Formation [091] Since a wavelength is short in a Millimeter Wave (mmW) range, a plurality of antenna elements can be installed in the
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16/89 same area size. That is, a wavelength in the frequency range of 30GHz is 1cm and therefore 64 (8x8) antenna elements can be installed in a two-dimensional array with 0.5 lambda (ie, a wavelength) on a panel. 4 x 4 (4 by 4) cm. Therefore, in the mmW range, coverage can be improved or flow capacity can be increased by increasing a beamforming gain (BF) with a plurality of antenna elements.
[092] In this case, to enable the adjustment of the transmission power and phase for each antenna element, if a transceiver unit (TXRU) is included, it is possible to form an independent beam for each frequency resource. However, it is not economical to install the TXRU in each of the approximately 100 antenna elements. Thus, a method is considered in which a plurality of antenna elements are mapped to a TXRU and a beam direction is adjusted with an analog phase switch. Such an analog BF method is capable of making only one beam direction over the entire frequency band, and there is a disadvantage that frequency selective BF is not allowed.
[093] It can be considered a hybrid BF that is an intermediary between the digital BF and the analog BF, and that has a TXRU B number lower than the Q number of antenna elements. In this case, although varying depending on a method of connecting the TXRU number B and the number of antenna elements Q, the beam directions capable of being transmitted at the same time are restricted to be less than B.
[094] In the following, typical examples of a method of connecting TXRU and antenna elements will be described with reference to drawings.
[095] FIG. 5 is an example of a transceiver unit model in a wireless communications system for which the present disclosure can be implemented.
[096] A TXRU virtualization model represents a relationship between
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17/89 output signals from TXRUs and output signals from antenna elements. Depending on a relationship between antenna elements and TXRUs, the TXRU virtualization model can be classified as a TXRU virtualization model, option 1: submatrix partition model, as shown in FIG. 5 (a), or as a TXRU virtualization model, option 2: full connection model.
[097] Referring to FIG. 5 (a), in the submatrix partition model, the antenna elements are divided into multiple groups of antenna elements, and each TXRU can be connected to one of the multiple groups of antenna elements. In this case, the antenna elements are connected to only one TXRU.
[098] Referring to FIG. 5 (b), in the total connection model, signals from multiple TXRUs are combined and transmitted to a single antenna element (or array of antenna elements). That is, it shows a method in which a TXRU is connected to all elements of the antenna. In this case, the antenna elements are connected to all TXRUs.
[099] In FIG. 5, q represents a signal vector transmitted from antenna elements with a number M co-polarized in a column. W represents a broadband TXRU virtualization weighting vector and W represents a phase vector to be multiplied by an analog phase switch. That is, an analog beamform direction is decided by W. x represents a signal vector of the number M_TXRU of TXRUs.
[0100] Here, the mapping of the antenna ports and TXRUs can be performed based on 1 to 1 or 1 to many.
[0101] Mapping from TXRU to element in FIG. 5 is merely an example, and the present disclosure is not limited to this and can be applied in an equivalent way even to the mapping of TXRUs and antenna elements that can be implemented in a variety of hardware forms.
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Return of Channel State Information (CSI) [0102] In most cellular systems, including an LTE system, a UE receives a pilot signal (or a reference signal) to estimate a channel from a base station, calculate information channel status (CSI) and report the CSI to the base station.
[0103] The base station transmits a data signal based on the CSI information fed back from the UE.
[0104] CSI information feedback from the UE in the LTE system includes channel quality information (CQI), a pre-coding matrix index (PMI) and a rating indicator (RI).
[0105] CQI feedback is wireless channel quality information that is provided to the base station for a purpose (link adaptation purpose) to provide guidance on which modulation and encoding scheme (MCS) should be applied when the base station transmits data.
[0106] In the event that there is a high quality of wireless communication between the base station and the UE, the UE can feed back a high CQI value and the base station can transmit data by applying a relatively high modulation order and a rate of low channel encoding. In the opposite case, the UE can return a low CQI value and the base station can transmit data by applying a relatively low modulation order and a high channel encoding rate.
[0107] The PMI feedback is the preferred pre-coding matrix information that is provided to a base station in order to provide guidance on which MIMO pre-coding scheme should be applied when the base station has installed multiple antennas.
[0108] A UE estimates a downlink MIMO channel between the base station and the UE from a pilot signal, and recommends, through PMI feedback, that the pre
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19/89 MIMO encoding is desired to be applied by the base station.
[0109] In the LTE system, only linear MIMO pre-coding capable of expressing the PMI configuration in a matrix form is considered.
[0110] The base station and the UE share a code book composed of a plurality of pre-coding matrices and each MIMO pre-coding matrix in the code book has a unique index.
[0111] Consequently, by feeding back an index corresponding to the most preferred MIMO pre-coding matrix in the code book as PMI, the UE minimizes an amount of feedback from it.
[0112] A PMI value is not necessarily composed of an index. For example, in the case where there are eight transmitter antenna ports in the LTE system, a final 8tx MIMO pre-coding matrix can be derived only when two indices (first PMI and second PMI) are combined.
[0113] The IR return is information about the number of preferred transmission layers, the information that is provided to the base station to provide guidance on the number of preferred transmission layers of the UE when the base station and the UE have multiple antennas to thereby enable multilayered transmission through spatial multiplexing.
[0114] RI and PMI are closely correlated. It is because the base station is able to know which pre-coding needs to be applied to a given layer, depending on the number of transmission layers.
[0115] Regarding the PMI / RM return configuration, a PMI codebook can be configured in relation to the single layer transmission and then PMI can be defined for each layer and fed back, but this method has a disadvantage that an amount of PMI / IR return information increases notably with an increase in the number of transmission layers.
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20/89 [0116] Thus, in the LTE system, a PMI codebook is defined depending on the number of transmission layers. That is, for layer R transmission, the N number of Nt x R arrays is defined (in this case, R represents the number of layers, Nt represents the number of antenna ports of the transmitter and N represents the size of the codebook) .
[0117] Therefore, in LTE, a size of a PMI codebook is defined regardless of the number of transmission layers. As a result, once the PMI / RI is defined in this structure, the number of transmission layers (R) is in accordance with a classification value of the pre-coding matrix (Nt x R matrix) and, for this reason, the term “rating indicator (IR)” is used.
[0118] Unlike PMI / RI in the LTE system, PMI / RI described in the present disclosure is not restricted to signifying an index value of an Nt x R pre-coding matrix and a classification value of the pre-coding matrix .
[0119] The PMI described in the present disclosure indicates information about a preferred MIMO pre-encoder among MIMO pre-encoders capable of being applied by a transmitter, and a shape of the pre-encoder is not limited to a linear pre-encoder which is able to be expressed in a matrix form, unlike in the LTE system. In addition, the RI described in the present disclosure means wider than RO in LTE and includes feedback information indicating the number of preferred transmission layers.
[0120] CSI information can be obtained in all frequency domains of the system or in some of the frequency domains. In particular, in a broadband system, it may be useful to obtain CSI information in some frequency domains (for example, subband) preferred by each UE and then feed back the obtained CSI information.
[0121] In the LTE system, the CSI return is performed through an UL channel
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21/89 and, in general, the periodic CSI return is performed through a physical uplink control channel (PUCCH) and aperiodic CSI return is performed via a shared physical uplink channel (PUSCH) which is a UL data channel .
[0122] Aperiodic CSI feedback means temporarily transmitting a feedback only when a base station needs CSI feedback information, and the base station triggers the CSI feedback via a DL control channel, such as a PDCCH / ePDCCH.
[0123] In the LTE system, what information a UE needs for feedback in response to the CSI feedback trigger is defined as a PUSCH CSI reporting mode, as shown in FIG. 8, and a PUSCH CSI reporting mode, in which the UE needs to operate, is reported to the UE in advance via an upper layer message.
Procedure Related to Channel State Information (CSI) [0124] In the new radio (NR) system, a channel status information reference signal (CSI-RS) is used for time / frequency tracking, CSI calculation , calculation of received signal strength (RSRP) of layer 1 (L1) or mobility [0125] Throughout the present disclosure, A and / or B can be interpreted as the same as including at least one of A or B.
[0126] CSI calculation is related to CSI acquisition, and L1-RSRP calculation is related to beam management (BM).
[0127] The CSI indicates all types of information indicative of the quality of a radio channel (or link) formed between an UE and an antenna port.
[0128] Hereinafter, the operation of a UE with respect to the CSI related procedure will be described.
[0129] FIG. 6 is a flow chart illustrating an example of a CSI-related procedure.
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22/89 [0130] To accomplish one of the above purposes of a CSI-RS, a terminal (for example, a UE) receives CSI-related configuration information from a base station (for example, a general node B (gNB)) via radio resource control (RRC) signaling (S610) [0131] CSI-related configuration information can include at least one of the information related to CSI interference management features, information related to the CSI measurement configuration , information related to the configuration of CSI resources, information related to CSI-RS resources, or information related to the configuration of CSI reporting.
[0132] Information related to CSIIM resources can include CSI-IM resource information, CSI-IM resource set information, etc.
[0133] The CSI-IM resource set is identified by a CSI-IM resource set ID (identifier) and a resource set includes at least one CSI-IM resource.
[0134] Each CSI-IM resource is identified by a CSIIM resource ID.
[0135] Information related to the configuration of CSI resources defines a group including at least one of a set of non-zero power CSI-RS (NZP) resources, a set of CSI-IM resources or a set of resources of CSI-SSB.
[0136] That is, information related to CSI resource configuration includes a list of CSI-RS resource sets and the list of CSI-RS resource sets can include at least one list of NZP CSI resource sets -RS, a list of CSI-IM resource sets or a list of CSI-SSB resource sets.
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23/89 [0137] Information related to the configuration of CSI resources can be expressed as CSI-REsourceConfig IE.
[0138] The CSI-RS resource set is identified by a CSI-RS resource set ID and a resource set includes at least one CSI-RS resource.
[0139] Each CSI-RS resource is identified by a CSIRS resource ID.
[0140] As shown in Table 4, the parameters (for example: the repetition of parameters related to BM, and the parameter related to trs-Info indicative of (or indicating) a purpose of a CSI-RS can be defined for each NZP CSI-RS feature set.
[0141] Table 4 shows an example NZP CSIRS IE feature set.
[Table 4]
- ASN1START - TAG-NZP-CSI-RS-RESOURCESET-STARTNZP-CSI-RS-ResourceSet :: = SEQUENCE { nzp-CSI-ResourceSetId NZP-CSI-RS-ResourceSetId, nzp-CSI-RS-Resources SEQUENCE (SIZE (1 ..maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId, repetition ENUMERATED {on, off} aperiodicT riggeringOffset INTEGER (0..4) trs-Info ENUMERATED {true} }- TAG-NZP-CSI-RS-RESOURCESET-STOP- ASN1STOP
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24/89 [0142] In Table 4, parameter repetition is a parameter indicating whether the same beam is repeatedly transmitted, and indicates whether repetition is set to “ON” or “OFF” for each set of NZP CSI- resources. LOL.
[0143] The term "transmission beam (Tx)" used in the present disclosure can be interpreted as the same as a space domain transmission filter, and the term "reception beam (Rx)" used in the present disclosure can be interpreted as the same as a spatial domain reception filter.
[0144] For example, when the parameter repetition in Table 4 is set to “OFF”, a UE does not assume that an NZP CSI-RS resource (s) in a resource set is transmitted to the same transmission filter as the DL spatial domain and the same Nrofports in all symbols.
[0145] In addition, the repetition of parameters corresponding to an upper layer parameter corresponds to “CSI-RS-ResourceRep” of parameter L1.
[0146] Information related to the configuration of the CSI report includes the reportConfigType parameter indicative of behavior in the time domain and the reportQuantity parameter indicative of a quantity related to the CSI to be reported.
[0147] The behavior of the time domain can be periodic, aperiodic or semi-persistent.
[0148] In addition, the information related to the configuration of the CSI report can be represented as CSI-ReportConfig IE and Table 5 shows an example of the IE CSI-ReportConfig.
[Table 5]
- ASN1START
- TAG-CSI-RESOURCECONFIG-START
CSI-ReportConfig :: = SEQUENCE {
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25/89 reportConfigId
CSI-ReportConfigId, carrier
ServCellIndex
OPTIONAL, - Need S resourcesForChannelMeasurement
CSI-ResourceConfigId, csi-IM-ResourcesForInterference
CSI-ResourceConfigId
OPTIONAL,
- Need R nzp-CSI-RS-ResourcesForInterference
CSI-ResourceConfigId
OPTIONAL,
- Need R reportConfigType
CHOICE {periodic
SEQUENCE {reportSlotConfig pucch-CSI-ResourceList semiPersistentOnPUCCH
CSI-ReportPeriodicityAndOffset,
SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource
SEQUENCE {reportSlotConfig
CSI-ReportPeriodicityAndOffset, pucch-CSI-ResourceList
SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource}, semiPersistentOnPUSCH
SEQUENCE {}, reportSlotConfig reportSlotOffsetList p0alpha
ENUMERATED {sl5, sl10, sl20, sl40, sl80, sl160, sl320},
SEQUENCE (SIZE (1 .. maxNrofUL-Allocations)) OF INTEGER (0..32),
P0-PUSCH-AlphaSetId aperiodic
SEQUENCE {reportSlotOffsetList
SEQUENCE (SIZE (1..maxNrofUL-Allocations)) OF INTEGER (0..32)}, reportQuantity
CHOICE {none
NULL, cri-RI-PMI-CQI
NULL, cri-RI-i1
NULL, cri-RI-i1-CQI
SEQUENCE {}, pdsch-BundleSizeForCSI
ENUMERATED {n2, n4}
OPTIONAL cri-RI-CQI
NULL,
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cri-RSRP NULL, ssb-Index-RSRP NULL, cri-RI-LI-PMI-CQI NULL },
[0149] In addition, the UE measures the CSI based on the configuration information related to the CSI (S620).
[0150] CSI measurement can include (1) receiving a CSI-RS from the UE (S621) and (2) computing the CSI based on the CSI-RS (S622) received.
[0151] A sequence for CSI-RS is generated by Equation 2, and an initialization value of a pseudo-random sequence C (i) is defined by Equation 3.
[0152] Equation 2] r (m) = -t = (1 - 2 c (2m)) + j - ^ = (1 - 2 c (2m +1)) v2 v2 [Equation 3] ^c init = ( ²¹⁰ (^ symb ⁿ s, _f ^{+ + 1} ) ( ²ⁿ ID + 1) + ^ ID) ^mod23 1 [0153] In Equations 2 and 3, nf is a partition number within a radio frame, and a sequence generator pseudorandom is initialized with Cint at the beginning of each OFDM symbol where nf is the partition number within a radio frame.
[0154] In addition, l indicates an OFDM symbol number on a partition and ” ^ID indicates the upper layer parameter scrambling ID.
[0155] In addition, in relation to the CSI-RS, the mapping of the resource element (RE) of the CSI-RS resources of the CSI-RS is performed in the time and frequency domains by the upper layer parameter CSI-RS-ResourceMapping .
[0156] Table 6 shows an example of CSI-RS-ResourceMapping IE. ________ [Table 6] _______________________________________________________________________
- ASN1START
- TAG-CSI-RS-RESOURCEMAPPING-START
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CSI-RS-ResourceMapping :: = SEQUENCE { frequencyDomainAllocation CHOICE { row1 BIT STRING (SIZE (4)), row2 BIT STRING (SIZE (12)), row4 BIT STRING (SIZE (3)), other BIT STRING (SIZE (6)) },nrofPorts ENUMERATED {p1, p2, p4, p8, p12, p16, p24, p32}, firstOFDMSymbolInTimeDomain INTEGER (0..13), firstOFDMSymbolInTimeDomain2 INTEGER (2..12) cdm-Type ENUMERATED {noCDM, fd-CDM2, cdm4-FD2-TD2, cdm8- FD2-TD4},density CHOICE { dot5 ENUMERATED {evenPRBs, oddPRBs}, one NULL, three NULL, spare NULL },freqBand CSI-FrequencyOccupation, }
[0157] In Table 6, a density (D) indicates a CSI-RS resource density measured in a RE / port / physical (PRB) resource block, and nrofPorts indicates the number of antenna ports.
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28/89 [0158] In addition, the UE reports the measured CSI for the base station (S630).
[0159] Here, when an amount of CSI-ReportConfig in Table 6 is set to “none (or No report)”, the UE can skip the report.
[0160] However, even when the quantity is set to “none (or No report)”, the UE can report the measured CSI to the base station.
[0161] The case in which the quantity is set to none is t when an aperiodic TRS is triggered or when the repetition is defined.
[0162] Here, it can be defined that the UE report is omitted only when the repetition is set to “ON”.
[0163] To keep it short, when repetition is set to “ON” and “OFF”, a CSI report can indicate any of the “No report”, “SSBRI Indicator Resource (SSBRI) and L1-RSRP”, and “ CSI-RS Resource Indicator ”(CRI) and L1-RSRP”.
[0164] Alternatively, it can be defined to transmit a CSI report indicative of “SSBRI and L1-RSRP” or “CRI and L1-RSRP” when the repetition is set to “OFF”, it can be set in such a way, and for transmit a CSI report indicative of “No report”, “SSBRI and L1-RSRP”, or “CRI and L1-RSRP” when the repetition is “ON”.
CSI Measurement and Reporting Procedure [0165] The NR system supports more flexible and dynamic CSI measurement and reporting.
[0166] CSI measurement can include receiving a CSI-RS and acquiring CSI when calculating the CSI-RS received.
[0167] Behaviors in the CSI measurement and reporting time domain, aperiodic / semi-persistent / periodic channel (CM) measurement and interference (IM) measurement are supported.
[0168] To configure CSI-IM, four NZP CSI-RS RE port standards are used.
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29/89 [0169] The NR CSI-IM based IMR has a design similar to the LTE CSI-IM and is configured independently of the ZP CSI-RS capabilities for the PDSCH rate matching.
[0170] In addition, each port on the NZI CSI-RS-based IMR emulates an interference layer having (a desirable channel and) a pre-coded NZP CSI-RS.
[0171] This is a measurement of intracellular interference in a multiuser case and aims mainly at MU interference.
[0172] On each configured NZI CSI-RS-based IMR port, the base station transmits the pre-encoded NZP CSI-RS to the UE.
[0173] The UE assumes a channel / interference layer for each port in a set of resources and measures the interference.
[0174] If there is no return of PMI or IR for a channel, a plurality of resources are configured in a set and the base station or network indicates, through DCI, a subset of NZP CSI-RS resources for channel measurement / interference.
[0175] The Adjustment of resources and configuration of resource adjustment will be described in more detail.
Resource setting [0176] Each CSI resource setting “CSI-ResourceConfig” includes the configuration of the resource set S> 1 CSI (which is provided by the upper layer parameter “csi-RS-ResourceSetList”).
[0177] Here, an adjustment of CSI resources corresponds to the list of CSI-RS resources.
[0178] Here, S represents the number of CSI-RS resource sets configured.
[0179] Here, the S> 1 CSI feature set configuration includes each
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30/89 set of CSI resources including CSI-RS resources (composed of NZP CSIRS or CSI-IM) and an SS / PBCH block resource (SSB) used for L1RSRP computing.
[0180] Each CSI resource configuration is placed in a DL bandwidth (BWP) portion identified by the upper layer parameter bwp-id.
[0181] In addition, all CSI resource configurations linked to a CSI report adjustment have the same DL BWP.
[0182] In a CSI resource setting included in CSI-ResourceConfig IE, a time domain behavior of a CSI-RS resource can be indicated by the upper layer parameter resourceType and can be configured as aperiodic, periodic or semi-persistent.
[0183] The S number of CSI-RS resource sets configured for periodic and semi-persistent CSI resource adjustments is restricted to “1 [0184] A periodicity and partition deviation configured for periodic and semi-persistent CSI resource adjustments is given from a related DL BWP numerology, just as it is given by bwp-id.
[0185] When the UE is configured with a plurality of CSIResourceConfig including the same NZP CSI-RS resource ID, the same time domain behavior is configured for the CSI-ResourceConfig.
[0186] When the UE is configured with a plurality of CSIResourceConfig having the same resource ID as CSI-IM, the same time domain behavior is configured for CSI-ResourceConfig.
[0187] Then, one or more CSI resource settings for channel measurement (CM) and interference measurement (IM) are configured through upper layer signaling.
[0188] - A CSI-IM feature for measuring interference.
[0189] - An NZP CSI-RS feature for measuring interference.
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31/89 [0190] - An NZP CSI-RS feature for channel measurement.
[0191] That is, a channel measurement feature (CMR) can be an NZP CSI-RS for CSI acquisition, and an interference measurement feature (IMR) can be an NZP CSI-RS for CSI-IM and for IM.
[0192] Here, CSI-IM (or a ZP CSI-RS for IM) is used primarily for measuring inter-cell interference.
[0193] In addition, an NZP CSI-RS for IM is used primarily for measuring intracellular interference from a multiuser.
[0194] The UE may assume that a CSI-RS resource (s) and a CSI-IM / NZP CSI-RS resource (s) for measuring interference configured for a CSI report is 'QCL-TypeD' for each feature.
Resource Adjustment Configuration [0195] As described above, a resource adjustment can represent a list of resource sets.
[0196] With respect to aperiodic CSI, each trigger state configured using the upper layer parameter “CSI-AperiodicTriggerState” is that each CSI-ReportConfig is associated with one or more CSI-ReportConfig linked to a periodic, semi-persistent or resource adjustment aperiodic.
[0197] A report setting can be connected to a maximum of three resource settings.
[0198] - When a resource setting is configured, a resource setting (provided by the upper layer parameter resourcesForChannelMeasurement) is about channel measurement for L1-RSRP calculation.
[0199] - When two resource settings are configured, the first resource setting (provided by the upper layer parameter resourcesForChannelMeasurement) is for channel measurement and the second resource adjustment (given by csi-IM-ResourcesForInterference or nzp-CSI- LOL
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ResourcesForInterference) is for CSI-IM or for measuring interference performed on an NZP CSI-RS.
[0200] - When three resource settings are configured, the first resource setting (provided by resourcesForChannelMeasurement) is for channel measurement, the second resource adjustment (given by csi-IM-ResourcesForInterference) is for CSI based interference measurement -IM and the third resource adjustment (given by nzp-CSI-RS-ResourcesForInterference) is for measurement of interferences based on NZP CSI-RS.
[0201] Regarding semi-persistent or periodic CSI, each CSIReportConfig is linked to a periodic or semi-persistent resource adjustment.
[0202] - When a resource setting (provided by resourcesForChannelMeasurement) is configured, the resource setting is about channel measurement for calculating L1-RSRP.
[0203] - When two resource settings are configured, the first resource setting (provided by resourcesForChannelMeasurement) is for channel measurement, and the second resource adjustment (given by the parameter csi-IMResourcesForInterference) is used for interference measurement performed in CSI -I AM.
[0204] CSI calculation for CSI measurement will be described in more detail.
[0205] If interference measurement is performed in CSI-IM, each CSI-RS resource for channel measurement is associated with a CSI-RS resource in a corresponding resource set in an order of CSI-RS resources and CSI-IM resources.
[0206] The number of CSI-RS resources for channel measurement is the same as the number of CSI-IM resources.
[0207] In addition, when interference measurement is performed on a
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NZP CSI-RS, the UE is not expected to be configured with one or more NZP CSI-RS features in an associated feature set within a feature set for channel metering.
[0208] An UE configured with the upper layer parameter nzp-CSI-RS-ResourcesForInterference is not expected to be configured with 18 or more NZP CSI-RS ports in a NZP CSI-RS resource pool.
[0209] For the measurement of CSI, the UE assumes the following.
[0210] - Each NZP CSI-RS port configured for interference measurement corresponds to an interference transmission layer.
[0211] - Every NZP CSI-RS interference transmission layer for interference measurement considers an energy ratio per resource element (EPRE).
[0212] - a different interference signal in an RE (s) of an NZP CSI-RS feature for channel measurement, an NZP CSI-RS feature for interference measurement or a CSI-IM feature for interference measurement .
[0213] A CSI reporting procedure will be described in more detail.
[0214] For the CSI report, the time and frequency resources available to a UE are controlled by a base station.
[0215] The CSI can include at least one of the channel quality indicators (CQI), a pre-coding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a block resource indicator SS / PBCH (SSBRI), a layer indicator (LI), a classification indicator (RI) or L1-RSRP.
[0216] In relation to CQI, PMI, CRI, SSBRI, LI, RI and L1-RSRP, the UE can be configured with N> 1 report adjustment CSI-ReportConfig, M> 1 resource adjustment CSI-ResourceConfig and a list of one or two trigger states (provided by aperiodicTriggerStateList and semiPersistentOnPUSCH-TriggerStateList) by an upper layer.
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34/89 [0217] In aperiodicTriggerStateList, each trigger state includes a channel and a list of associated CSI-ReportConfigs, selectively indicative of feature set IDs for interference.
[0218] In semiPersistentOnPUSCH-TriggerStateList, each trigger state includes an associated CSI-ReportConfig.
[0219] In addition, CSI reporting time-domain behavior supports periodic, semi-persistent and aperiodic CSI reports.
[0220] The following will describe periodic, semi-persistent and aperiodic CSI reports.
[0221] Periodic CSI pre-classification is performed on a PUCCH and short on a long PUCCH.
[0222] A periodicity and partition deviation of the periodic CSI report can be configured by RRC and refer to the CSI-ReportConfig IE.
[0223] So, SP CSI report is performed on a short PUCCH, a long PUCCH or a PUSCH.
[0224] In the case of SP CSI in a short / long PUCCH, a periodicity and partition deviation is configured by RRC, and CSI reporting to an additional MAC CE is activated / deactivated [0225] In the case of SP CSI in a PUSCH , a periodicity of the SP CSI report is configured by RRC, but a partition deviation is not configured by RRC and the SP CSI report is enabled / disabled by DCI (format 0_1).
[0226] The first CSI report delay follows a PUSCH time domain allocation value indicated by DCI, and the subsequent CSI report delay follows a periodicity that is configured by RRC.
[0227] For the SP CSI report on a PUSCH, a separate RNTI (SPCSI C-RNTI) is used.
[0228] The DCI 0_1 format can include a CSI request field and
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35/89 enable / disable a specific configured SP-CSI trigger state.
[0229] In addition, the SP CSI report is activated / deactivated in an identical or similar way to a mechanism with data transmission in an SPS PUSCH.
[0230] Then, an aperiodic CSI report is performed on a PUSCH and triggered by the DCI.
[0231] In the case of the AP CSI having an AP CSI-RS, an AP CSI-RS timer is configured by RRC.
[0232] Here, an AP CSI reporting timing is dynamically controlled by the DCI.
[0233] A reporting method (for example, transmit in order of RI, WB, PMI / CQI and SB PMI / CQI) by which CSI is divided and reported in a plurality of reporting instances, the method that is applied for reporting based on PUCCH LTE, is not applied in NR.
[0234] Instead, the NR restricts the configuration of specific CSI reports in a short / long PUCCH and a CSI omission rule is defined.
[0235] Regarding the AP CSI reporting time, PUSCH symbol / partition location of is dynamically indicated by the DCI. In addition, candidate partition variances are configured by RRC.
[0236] Regarding the CSI report, a partition deviation (Y) is configured for each report configuration.
[0237] In relation to UL-SCH, a partition deviation K2 is configured separately.
[0238] Two classes of CSI latency (low-latency and high-latency class) are defined in terms of the complexity of calculating CSI.
[0239] The low latency CSI is the WB CSI that includes the Type-I code book of up to 4 ports or the return CSI of up to 4 non-PMI ports.
[0240] The high latency CSI is a different CSI from the low latency CSI.
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36/89 [0241] In relation to a normal UE, (Z, Z ') is defined in a unit of OFDM symbols.
[0242] Z represents the minimum CSI processing time after receiving the CSI by firing DCI and before running the CSI report.
[0243] Z 'represents the minimum CSI processing time after receiving the CSI-RS over a channel / interference and before executing the CSI report [0244] Additionally, the UE reports the number of CSI that can be calculated to the Same time.
[0245] A-CSI or AP CSI used in the present specification indicate aperiodic CSI which is the CSI reported aperiodically by the UE.
[0246] In addition, the CSI report or CSI report used in this specification can be considered to have the same meaning.
[0247] To report the UE's ability to calculate or calculate A-CSI time, the UE reports a set of supported Z values and CSI configuration that can be supported for each Z value for the eNB.
[0248] Here, Z is defined by the minimum number of symbols required to calculate CSI for a given CSI configuration.
[0249] More specifically, Z refers to the minimum amount of time needed for calculation related to AP CSI processing, such as decoding time, channel measurement, CSI calculation and TX preparation.
[0250] A CSI configuration includes information indicating broadband (WB) or subband (SB) and WB CSI only; information on the maximum number of CSI-RS ports; and information about the type 1 code book or type 2 code book.
[0251] When the UE supports a plurality of numerology, information on CSI can be reported for each numerology.
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37/89 [0252] When an A-CSI report is triggered on partition n on the PUSCH, the UE discards the A-CSI report in the following cases:
[0253] - A case where the time interval between the last PDCCH symbol and the PUSCH start symbol on partition n is less than a reported value of Z in relation to a given CSI setting and [0254] - A case where an AP CSI-RS resource is transmitted from partition n, and the time interval between the last symbol of a CSI-RS resource and the PUSCH start symbol is less than a reported value of Z with respect to specific CSI configuration.
[0255] And those symbols between the z symbols before the PUSCH start symbol and the PUSCH start symbol are not valid as reference resources (CSI).
[0256] In the following, an A-CSI report trigger and a related CSI report will be described.
[0257] When the eNB triggers an A-CSI report by transmitting the downlink control information (DCI) on partition n, the UE operates as follows.
[0258] A-CSI is transmitted by the UE through the PUSCH allocated as a resource by the DCI.
[0259] The PUSCH transmission time is indicated by a specific DCI field (which is defined as a Y value).
[0260] More specifically, the PUSCH is transmitted from partition (n + Y) th (partition n + Y) with reference to partition n that corresponds to the trigger time of the A-CSI report.
[0261] For example, when a DCI field for the Y value is defined by 2 bits, the Y value for 00, 01, 10 and 11 is defined, respectively, by RRC signaling and, more specifically, defined within a configuration report
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38/89 defined through RRC signaling.
[0262] The report setting can also be expressed by reporting the setting or CSI-ReportConfig.
[0263] An A-CSI report trigger can trigger one or more specific report settings, and the value of 00, 01, 10 and 11 of the DCI field is set according to the Y value defined in the triggered report setting.
[0264] As described above, when the time interval or timing interval between the last PDCCH symbol and the PUSCH start symbol is less than the Z value corresponding to the triggered A-CSI CSI configuration, the UE transmits A -CSI fired for the eNB without dropping or updating the A-CSI.
[0265] Since the amount of time allocated for the actual calculation is less than the minimum amount of time Z required for calculating the A-CSI, the UE is unable to calculate the A-CSI.
[0266] As a result, the UE does not delete or update the triggered CSI.
[0267] When a Non-Zero Power CSI-RS (NZP) or Zero Power CSI-RS (ZP) used for channel estimation or triggered A-CSI interference estimation is an aperiodic CSI-RS, the UE estimates a channel or interference through a corresponding RS trip measurement.
[0268] In other words, this indicates that the UE estimates a channel or interference using only the corresponding RS (NZP CSI-RS or ZP CSI-RS).
[0269] At this time, if the time interval between the last symbol of a CSI-RS resource and the PUSCH start symbol is less than the Z value corresponding to the triggered A-CSI CSI configuration, in the same way as the UE operation described above, the UE transmits the corresponding A-CSI to the eNB without dropping or updating the corresponding A-CSI.
[0270] And when the UE calculates CSI, the UE does this by assuming the receipt of data for a specific frequency and / or time resource area, which is
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39/89 CSI reference resource call.
[0271] The CSI reference resource can simply be called a reference resource.
[0272] Once the UE starts calculating CSI from the CSI reference resource time, the UE can calculate CSI only when the amount of time as the z symbols of the CSI reference resource time are insurance.
[0273] Therefore, the reference resource time must be defined at least before the z symbols (or z symbols + 1) in relation to the CSI report time.
[0274] For this purpose, when the validity of a reference resource is verified, symbols or partitions before at least z symbols (or z symbols + 1) are determined to be valid in relation to the CSI report time, but invalid, otherwise.
[0275] Here, the reference resource (CSI) is defined in units of partitions.
[0276] In addition, the partition whose number is less than or equal to n - nCQI_REF (that is, partition n - nCQI_REF) is determined as the reference resources (CSI) with reference to the partition for CSI reporting (for example, partition n ).
[0277] The above statement, which says that 'symbols or partitions before at least z symbols (or z + 1 symbols) are determined with respect to the CSI report time, but invalid, otherwise', may indicate that nCQI_REF is configured by Eq. 4 below.
[Eq. 4] ⁿ CQI_REF ^min '(the number of OFDM symbols comprising at least one partition) ^{+ 1} [0278] In Eq. 4, the minimum discards the digits after the decimal point and is
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40/89 indicated by a symbol [.J.
[0279] The UE sets the most recent partition that satisfies the condition of validity for a reference resource between partitions whose number is less than or equal to n - nCQI REF as a reference resource.
[0280] Likewise, the UE can simply define the nnCQI REF interval as the reference resource.
[0281] And the time deviation of the CSI reference resource can be determined based on proposal 3 to be described later, and detailed descriptions of how the time deviation of the CSI reference resource is determined will be given by proposal 3.
[0282] The A-CSI report trigger field included in the DCI can be interpreted as follows.
[0283] When an eNB instructs a UE to perform an A-CSI trigger for a plurality of report adjustments simultaneously, and a definition of the Y value is different for each report adjustment, a problem occurs as described below and an UE operation to solve the problem through various methods will be described.
[0284] For example, suppose that a report fit 1 is set to Y = {0, 1,2, 3} and a report fit 2 is set to Y = {1,2, 3, 4}.
[0285] In this case, there is an ambiguity in which value the DCI field (2 bits) indicating the value Y should be interpreted.
[0286] Therefore, to remove the ambiguity, it is proposed that the UE operate according to the following methods.
(Method 1) [0287] The UE recently generates Y 'as an intersection between two different Ys and interprets the DCI field according to the Y' value.
[0288] In other words, in the example above, the intersection of two Ys
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41/89 is {1,2, 3} and the UE interprets 00, 01, 10 and 11 of the DCI field as 1,2, 3 and 3, respectively.
[0289] If the intersection between two different Ys is {1}, the UE interprets 00, 01, 10 and 11 as 1, 1, 1 and 1, respectively.
[0290] If the intersection between two different Ys is {1, 2}, the UE interprets 00, 01, 10 and 11 as 1, 2, 2 and 2.
[0291] In the example above, when the number of elements belonging to the intersection between two different Ys is less than the states (for example, 00, 01, 10 and 11) of the DCI field, the remaining states will be defined by repeating the last intersection value.
[0292] However, different from the definition above, the remaining states can be defined as reserved.
(Method 2) [0293] The UE interprets the DCI field according to the Y value defined in one of a plurality of report adjustments.
[0294] For example, among a plurality of report adjustments, the UE interprets the DCI field using the Y value for a report adjustment with a low report adjustment index.
[0295] Likewise, among a plurality of report settings, the UE interprets the DCI field using the Y value for a report setting with a low index for a component carrier (CC).
[0296] The UE places priorities between the report configuration index and the CC index and determines a Y value for a report configuration using the CC index.
[0297] If the CC index is the same, the UE can then determine the Y value according to the report's adjustment index.
[0298] Or, as described above, the priority can be reversed (a high
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42/89 priority is defined for the report's adjustment index).
(Method 3) [0299] The UE can expect a plurality of report settings to always have the same Y value [0300] In other words, eNB configures report settings 1 and 2 to have the same Y value throughout RRC signaling.
[0301] For example, eNB can configure report setting 1 using Y = {1,2, 3, 4} and report setting 2 using Y = {1,2, 3, 4}.
(Method 4) [0302] The UE determines the time deviation of the aperiodic CSI report using the greater value of two different Y values.
[0303] For example, report setting 1 can be defined by Y1 = {0, 1, 2, 3} and report setting 2 can be defined by Y2 = {1, 2, 3, 4}.
[0304] When the DCI field for Y (for example, 2 bits) is ‘00’, Y1 = 0 and Y2 = 1; and therefore the value Y is determined by 1, which is the greater of the two values.
[0305] When the DCI field for Y (for example, 2 bits) is 01, Y1 = 1 and Y2 = 2; and therefore the value Y is determined by 2, which is the greater of the two values.
[0306] The Y value can be set in the same way as above when the DCI field value is' 10 'and' 11 ', and the Y value for the DCI field value of' 10 'and' 11 'is determined to be' 3 'and' 4 ', respectively.
[0307] If three Y values are defined, the largest among the three values can be determined as a time deviation, applying the same method described above.
[0308] As described above, the eNB can instruct the UE to execute an AP CSI report trigger via a DCI and determine the aperiodic CSI report time drift according to the methods described above (Methods 1 to
4) using the Y values defined for the respective AP CSI report settings triggered by N.
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43/89 [0309] In addition, the eNB can indicate the data transmission time through the PUSCH during the execution of an AP CSI report trigger through the same DCI simultaneously.
[0310] At this time, the data transmission time through the PUSCH is defined as a K2 value, and a plurality of candidate sets is defined for the UE through the signaling of the upper layer in advance.
[0311] One of the candidate sets is determined (or selected) as a final K2 value via the DCI field (which is also called the time offset field).
[0312] In addition, the DCI field to select the K2 value and the DCI field to select the Y value are not defined by separate fields, but are defined by the same DCI field.
[0313] When an AP CSI report trigger occurs, the UE uses the corresponding DCI field to select the Y value, and when PUSCH data programming occurs, the corresponding DCI field is used to select the K2 value.
[0314] When PUSCH data programming occurs while an AP CSI report trigger is executed simultaneously through the DCI, an ambiguity arises about defining each value in the time-shift field as a candidate of the Y value or a candidate for the value K2.
[0315] To resolve the ambiguity, it is possible to directly extend and apply the methods mentioned above (Methods 1 to 4).
[0316] In other words, the methods proposed (Methods 1 to 4) above are related to how to set the value of the time deviation field when a plurality of sets of Y candidates is given, and Methods 1 to 4 can also be applied to the K2 candidate pool by treating the K2 candidate pool as a Y candidate pool.
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44/89 [0317] For example, Method 4 can be extended and applied as described below.
[0318] The UE defines the timing deviation field using the largest of the different Y and K2 values.
[0319] For example, it is assumed that a report setting 1 is defined as Y1 = {0, 1,2, 3} and a report setting 2 is defined as K2 = {3, 4, 5, 6}.
[0320] If the DCI field of the time deviation is 00, Y1 = 0, Y2 = 1 and K2 = 3; and therefore, the timing deviation field is determined by the highest value 3.
[0321] If the DCI field is 01, Y1 = 1, Y2 = 2 and K2 = 4; and therefore, the time deviation field is determined by the highest value 4.
[0322] DCI field values for '10 'and' 11 'can be determined in the same way, and in this case, DCI field values for' 10 'and' 11 'are determined as' 5' and '6' , respectively.
[0323] The UE can multiplex PUSCH and CSI data on the partition (n + time deviation) in relation to partition n that received DCI according to an indicated DCI value and report (or transmit) the multiplexed and CSI data to the eNB simultaneously .
[0324] Now, other methods for interpreting the DCI field related to the A-CSI reporting trigger in addition to the methods mentioned above (Methods 1 to 4) will be described.
(Method 5) [0325] In another method, the UE builds a join set by combining candidate sets from different candidate sets Ys and K2 and defines the value of a n-bit sync offset deviation field as the values ranging from the largest element to the second largest element of the joint assembly.
[0326] UE multiplexes PUSCH and CSI data on the partition (n + offset
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45/89 time) in relation to partition n that received DCI according to an indicated DCI value and reports (or transmits) the multiplexed and CSI data to the eNB simultaneously.
(Method 6) [0327] In yet another method, after constructing a set of candidate sets of Ys using Methods 1 through 4, a join set is constructed by combining one of the candidate sets Y and a candidate set of K2.
[0328] And the value of the DCI field of a n-bit time offset is defined by the values ranging from the largest element to the second largest element of the joint set.
(Method 7) [0329] Method 7 builds a set of candidate sets of Ys using Methods 1 through 4 and defines the i-th value of the DCI field of the timing deviation using a sum of the i-th element of one of the sets of candidates Y and the i-th element of the sets of candidates K2.
[0330] For example, when the set of candidates Y is {1,2,3,4} and the set of candidates K2 is {5, 6, 7, 8}, the respective DCI field deviation values of 2 bits for 00, 01, 10 and 11 can be set by 1 + 5 (6), 2 + 6 (8), 3 + 7 (10) and 4 + 8 (12).
(Method 8) [0331] Method 8 builds a set of candidate sets of Ys using methods 1 through 4 and defines the i-th value of the DCI time-shift field as a sum of the i-th element of the candidate set of Ys, ignoring the K2 candidate pool [0332] Next, a relaxation method for calculating the AP CSI will be described.
[0333] The UE reports a value of Z as defined below for the eNB,
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46/89 using one of the UE's capabilities for calculating AP CSI.
[0334] When assuming CSI only PUSCH (without ACK / NACK of HARQ) for a given CSI numerology and complexity, Z is defined as the minimum number of symbols required for PDCCH detection / decoding time to receive DCI by triggering a report of CSI, channel estimation time and CSI calculation time.
[0335] For low complexity CSI, a value of Z for a given numerology is defined as shown in Table 7 below.
[0336] And for highly complex CSI, a value of Z for a given numerology is defined as shown in Table 7 below.
[Table 7]
CSI complexity Units 15 kHz SCS 30 kHz SCS 60 kHz SCS 120 kHz SCS Low complexity CSI Symbols. Zi, i Z1.2 Z1.3 Z1.4 High complexity CSI 1 Symbols. Z2.1 Z2.2 Z2.3 Z2.4 High complexity CSI 2 Symbols. Zn + i, i Zn + 1.2 Zn + 1.3 Zn + 1.4
[0337] As described above, Z is defined as a sum of the amount of time required for DCI decoding (meaning DCI decoding time containing AP CSI trigger information), the amount of time required for channel estimation and the time required to calculate CSI.
[0338] Depending on the complexity of the CSI triggered in relation to the Z value, the eNB indicates a Y value (in other words, if it is a low complexity CSI or a high complexity CSI).
[0339] If it is assumed that the DCI that maintains an AP CSI trigger (namely AP CSI firing DCI) is transmitted to partition n, the UE reports the CSI corresponding to the eNB on the partition (n + Y time deviation).
[0340] If the time allocated to the UE for calculating the CSI is insufficient for the UE's ability to calculate the AP CSI, the UE, instead of updating (or
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47/89 calculate) the CSI, transmits the most recently reported CSI or arbitrary CSI (or specific CSI, predefined, for example, CQI = 0, PMI = 0 and RI = 1) to eNB.
[0341] FIG. 7 illustrates the situation mentioned above. In other words, FIG. 7 illustrates the moment when a periodic CSI-RS is received.
[0342] More specifically, FIG. 7 illustrates a situation where the most recent periodic CSI-RS (P) that was received on or before the reference resource time exists within a time period T.
[0343] In FIG. 7, the UE measures CSI through a periodic CSI-RS (P CSIRS), and it can be noted that the P CSI-RS and the CSI reference resource exist within time T.
[0344] In this case, within time T, the UE performs all DCI decoding, channel estimation and CSI calculation.
[0345] Therefore, the UE compares T and Z and if T <Z, it does not calculate (or update) the CSI, but transmits the most recently reported CSI or arbitrary CSI.
[0346] If T> = Z, the UE calculates CSI based on the periodic CSI-RS and reports the calculated CSI to the eNB.
[0347] FIGs. 8 and 9 illustrate another example of the timing in which a periodic CSIRS is received.
[0348] In other words, FIGs. 8 and 9 illustrate a situation in which the most recent P CSI-RS received at the time or before the reference resource exists before the T period.
[0349] Or FIGs. 8 and 9 illustrate a situation in which a P CSI-RS does not exist within the T period, but the P CSI-RS exists before the T period.
[0350] In other words, referring to FIGs. 8 and 9, the UE has already performed the channel measurement of a CSI-RS (periodic) before a CSI report trigger occurs.
[0351] Therefore, in this case, the UE performs DCI decoding and calculation of
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CSI within the T period.
[0352] The UE compares T and Z- (channel estimation time) and if T <Z (channel estimation time), it does not calculate (or update) CSI but transmits the most recently reported CSI or arbitrary CSI to eNB .
[0353] Here, the UE can report the channel estimation time to eNB using separate capacity.
[0354] If T> = Z- (channel estimation time), the UE calculates CSI and reports the calculated CSI to the eNB.
[0355] Here, Z- (channel estimation time) can be defined by a third variable Z ', and the UE can report Z and Z' to eNB, respectively.
[0356] FIG. 10 illustrates an example of a method for measuring CSI using a CSI-RS AP.
[0357] First, an AP CSI-RS is defined to always exist within time period T.
[0358] In this case, within time T, the UE performs all DCI decoding, channel estimation and CSI calculation.
[0359] Therefore, the UE compares T and Z and if T <Z, it does not calculate (or update) the CSI, but transmits the most recently reported CSI or arbitrary CSI.
[0360] If T> = Z, the UE calculates the CSI and reports the calculated CSI to the eNB.
[0361] FIG. 11 illustrates an example of another method for measuring CSI using an AP CSI-RS.
[0362] More specifically, FIG. 11 illustrates a situation in which an AP CSI-RS is transmitted long after the UE finishes decoding DCI.
[0363] In this case, the UE has to carry out all DCI decoding, channel estimation and CSI calculation within time period T.
[0364] However, since an AP CSI-RS is transmitted long after DCI decoding has finished, the UE is unable to perform the
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49/89 channel measurement and CSI calculation during period T until DCI decoding ends and AP CSI-RS is transmitted.
[0365] Therefore, the UE compares T and Z and if T <Z, it does not calculate (or update) CSI, but can transmit the most recently reported CSI or arbitrary CSI to eNB; however, if T> = Z, the UE is unable to calculate the CSI and, therefore, unable to report the CSI to eNB.
[0366] Therefore, to make the method as shown in FIG. 11, the eNB must transmit an AP CSI-RS within the DCI decoding time after the last triggering DCI OFDM symbol.
[0367] Or eNB must transmit an AP CSI-RS before Z- (decoding time) in the first OFDM symbol from which the AP CSI is reported.
[0368] The UE can report the decoding time to eNB through separate capacity.
[0369] Here, Z- (decoding time) can be defined as a third variable Z ', and the UE can report Z and Z' to eNB, respectively.
[0370] In other words, T 'between the time the AP CSI-RS used for channel measurement or interference measurement is last received and the start time at which CSI is reported, is less than Z', the UE determines that the time to calculate CSI is not enough and does not calculate CSI.
[0371] Therefore, the UE does not report a valid CSI, but reports a predefined fictitious CSI value (for example, RI = 1, PMI = 1 and CQI = 1) to eNB.
[0372] Or if T 'between the last OFDM symbol in which the AP CSI-RS is transmitted and the first OFDM symbol in which the AP-CSI is reported is less than Z- (decoding time), the UE does not calculate ( or updates) CSI but transmits the most recently reported CSI or arbitrary CSI to eNB.
[0373] And if T '> = Z- (decoding time) and T <Z, the UE does not calculate (or update) the CSI but transmits the most recent CSI or arbitrary CSI.
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50/89 [0374] If T '> = Z- (decoding time) and T> = Z, the UE calculates the CSI and reports the calculated CSI to the eNB.
[0375] The UE can report the decoding time to eNB through separate capacity.
[0376] Unlike the proposals to be described later, if Z 'is introduced, the Z in proposals 2 and 3 can be replaced by Z'.
[0377] As described above, the Z indicates the minimum time required for all calculations related to AP CSI processing, such as DCI decoding time, channel measurement, CSI calculation and TX preparation.
[0378] And the Z 'indicates the minimum time required for channel measurement, CSI calculation and TX preparation.
[0379] Therefore, it may be preferable to define the time provided for the UE, covering the last reception time of the CSI-RS used for channel measurement or interference measurement until the start time in which the CSI is transmitted, with reference to Z 'which does not include decoding time.
[0380] Proposals 2 and 3 below may be limited (or restricted) to the case where CSI is reported within a short period of time after the CSI report triggered.
[0381] For example, proposals 2 and 3 to be described later can be applied only in the case of a small Y value such as Y = 0 (or Y = 1).
[0382] If Y = 0, it may be related to the operation for independent CSI return that is operated on a partition, including CSI report trigger, channel measurement and even CSI report.
[0383] For the independent structure, the descriptions given above can be referenced.
[0384] For this purpose, a reference resource is defined to be the
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51/89 as close as possible to partition n, and the UE is made to measure a channel using a CSI-RS within a period of time between triggering the CSI report and the CSI report.
[0385] Or even if Y is a small, non-zero value (for example, Y = 1), since eNB is intended to generate CSI reports and receive a recent (or new) CSI report within over a short period of time, a reference feature can be set to be as close as possible to partition n, and eNB can be done to perform channel measurement using a recent CSI-RS close to the CSI reporting time.
[0386] On the other hand, if Y is a large value, since it takes a long time from a trigger time to the reporting time, the time when a CSIRS measures a channel does not cause a critical problem compared to the case in that Y is small.
[0387] Therefore, in this case, proposal 3 to be described later is not applied, but the time deviation of the reference resource is configured by one of the following options.
[0388] First, option 1 is described.
[0389] When a CSI-RS P / SP / AP is used to calculate CSI for A-CSI reporting, the time deviation of a CSI reference resource is derived from the Z value in relation to a given latency and numerology of CSI as described below.
[0390] In other words, nooLref is the same as Z / Nf ° ( _n ] or is the smallest value greater than or equal to Z / Nf ° ( _n ], such that partition n-nooi_ref corresponds to a valid partition downlink.
[0391] The above description can be applied to the P / SP CSI report in the same way.
[0392] Next, option 2 will be described.
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52/89 [0393] When a P / SP / AP CSI-RS is used to calculate CSI for A-CSI reporting, the time deviation of a CSI reference resource is derived from the Z value in relation to a given latency and CSI numerology as described below.
[0394] nCQLref is the same as Z / Nf ° ( _n ] + 1 or is the smallest value greater than or equal to Z / Nf ° (□] + 1, such that partition n-nCQI_ref corresponds to a partition downlink.
[0395] The above description can be applied to the P / SP CSI report in the same way.
[0396] In the case of option 2, the reference resource does not include all symbols before the symbols 0, 1,2, 3 ..... Z at the start time of the CSI report.
[0397] According to the current standard, since channel measurement or interference measurement cannot be performed after the reference feature, only option 2 already satisfies the condition of proposal 2.
[0398] Next, the details related to aperiodic CSI reporting timing and CSI relaxation will be briefly described.
[0399] Candidates of time Z of CSI calculation are defined in Table 7 above.
[0400] Although the CSI is transmitted only on the PUSCH, if the A-CSI report is triggered on partition n, the UE will not need to update the CSI with respect to the A-CSI report in the following cases:
[0401] - The case where MLN <Z for given complexity and CSI numerology and [0402] - The case where an AP CSI-RS resource is transmitted on partition n for a given CSI complexity and numerology, and MON < Z.
[0403] Here, L represents the last PDCCH symbol in partition n, M represents the PUSCH start symbol, and N represents the TA value (for example,
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TA = 1.4 symbol) in symbol units.
[0404] E O represents a later symbol between the last symbol of the AP CSI-RS feature for a channel measurement feature (CMR) and the last symbol of the AP CSI-RS feature for an interference measurement feature (IMR ).
[0405] And the PUSCH timing deviation for the A-CSI report can be determined as follows.
[0406] When PUSCH is programmed for a single A-CSI report only, the DCI field for PUSCH timing deviation is defined from Y in a report configuration.
[0407] And when PUSCH is programmed only for a plurality of A-CSI reports, the DCI field for the PUSCH timing deviation is defined as the maximum value between several Y values in the report setting.
[0408] For example, when Y = {1,2, 3, 6} in a report setting 1 and Y = {2, 3, 4, 5} in a report setting 2, Y can be set to Y = {2, 3 4, 6}.
[0409] Other details defined in the standard will be described.
[0410] The terms of low complexity CSI and high complexity CSI can be replaced by low latency CSI and high latency CSI, respectively.
[0411] Two classes of CSI latency are supported for the ability to calculate CSI.
[0412] The low latency CSI class is defined as WB CSI, including a maximum of four antenna ports, which can be applied only when a Type-I or PMI code book is not configured.
[0413] The high latency CSI class is defined as a superset of the entire CSI supported by the UE, and the descriptions given above are not applied to the L1 RSRP.
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54/89 [0414] And when CSI is transmitted via PUSCH, a start and length indicator value (SLIV) and PUSCH mapping type are determined by pusch-symbolAllocation in the same way as in PUSCH without CSI.
[0415] The PUSCH partition deviation when CSI is multiplexed with UL-SCH in the PUSCH is determined solely by the K2 value indicated by puschsymbolAllocation instead of aperiodicReportPartiçãoOffset.
[0416] The descriptions provided above are applied only in the case where the CSI is multiplexed with data.
[0417] Here, the numbers of candidate values for aperiodicReportPartiçãoOffset and K2 are the same.
[0418] The information related to the A-CSI report will be described in detail.
[0419] The condition for when the UE does not need to update the CSI for the A-CSI report will be described again based on the descriptions provided above.
[0420] First, an A-CSI report trigger with respect to a plurality of CSI will be described with the A-CSI report trigger with respect to the single CSI in mind.
[0421] FIG. 12 illustrates an example of a report trigger from A-CSI to CSI only proposed by this specification.
[0422] More specifically, FIG. 12 illustrates an example of an A-CSI reporting trigger in relation to the single CSI, where there is a periodic CSI-RS and CSI reference feature within a time window T.
[0423] In this case, the UE has to perform DCI decoding, channel estimation, CSI calculation and Tx preparation within time window T.
[0424] Therefore, when T <Z, the UE does not need to update the CSI.
[0425] FIG. 13 illustrates an example of an A-CSI reporting trigger for
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Single CSI having a periodic CSI-RS proposed by this specification.
(Proposal 1) [0426] In the case of a report trigger from A-CSI to single CSI, the UE does not update the CSI when T <Z.
[0427] Here, T is the length of time between the reception time of the last triggering DCI OFDM symbol and the transmission time of the first OFDM symbol in the AP CSI report.
[0428] Unlike FIG. 12, although T> Z, FIG. 13 illustrates the case where P CSI-RS and the reference resource are delayed in time window T.
[0429] In this case, although T> Z, the UE is unable to complete the CSI calculation, since it starts channel estimation too late.
[0430] Therefore, to prevent this from happening, the UE must perform channel / interference measurement on the ZP / NZP CSI-RS, where at least the z symbols are located before the first OFDM symbol in the report of AP CSI.
(Proposal 2) [0431] The UE does not need to measure channel or interference through the ZP / NZP CSI-RS received from 0 to Z symbols before the transmission time of the first OFDM symbol in the AP CSI report.
[0432] The time deviation of the CSI reference resource must be properly derived from Z to match proposal 2.
[0433] FIGs. 14 and 15 illustrate examples of a method for determining a time shift of a CSI reference resource proposed by the present specification.
[0434] More specifically, FIGs. 14 and 15 illustrate two options for determining a time deviation where Z = 5, Z / N) ff □ = 14 and a CSI report starts at the 10th th symbol of partition n.
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56/89 [0435] FIG. 14 illustrates an example of valid CSI-RS locations for measuring CSI reference channel and resource when nCQLref = | z / Nggg □].
[0436] In FIG. 14, since the reference resource is partition n-1, the UE cannot use a potential CSI-RS resource in symbol 1, 2, 3 or 4 of partition n for channel measurement.
[0437] The UE measures the channel of a CSI-RS in one or a few partitions before partition n.
[0438] However, this operation generates a lot of delay between the channel measurement and the CSI report.
[0439] As a result, the return of independent A-CSI that is performed on the same single partition on which CSI triggering, channel measurement and CSI reporting are conducted may not be supported.
[0440] To solve the problem mentioned above, as shown in FIG. 15, noQLref can be defined as [z / Wj] gg □].
[0441] In other words, FIG. 15 illustrates another example of CSI-RS locations valid for measuring CSI reference resource and channel when ^nCQI _ ^ref = [Z / A / g ^Z gg g] [0442] In FIG. 15, the reference feature is partition n, and partition n includes some symbols in addition to Z.
[0443] As a result, when the CSI-RS is transmitted on the first, second, third or fourth symbols of partition n, the UE can measure the channel using the transmitted CSI-RS and calculate the CSI from the new channel measurement.
(Proposal 3) [0444] When P / SP / AP CSI-RS is used for the calculation of CSI for the A-CSI report, the time deviation of the CSI reference resource is derived from the value of Z with respect to to CSI latency and numerology, as indicated below.
[0445] Here, nCQI_ref is the smallest value greater than or equal to [z / Nggg □], such that the
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57/89 n-nCQI_ref partition corresponds to a valid downlink partition.
[0446] Here, a specific partition can be considered as a valid downlink partition when the following conditions are met:
[0447] - When the specific partition includes a downlink or a set of flexible symbols in at least one upper layer, [0448] - When the specific partition is not located within a defined measurement range for the UE, [0449] - When the DL BWP active on a partition is the same as the DL BWP for which the CSI report is conducted, and [0450] - When at least one transmission occasion CSI-RS for channel measurement and CSI-RS for measurement of interference and / or occasion CSI-IM is located in the DRS active time not after the CSI reference resource on which the CSI report is conducted.
[0451] The above description can be applied to the P / SP CSI report in the same way.
[0452] When an AP CSI-RS is transmitted, a problem similar to that described with reference to FIG. 13 can occur, which will be described with reference to FIG. 16 [0453] As shown in FIG. 13, it can be seen that the AP CSI-RS is late in time window T.
[0454] In this case, although T> Z, the UE is unable to complete the CSI calculation, since it starts channel estimation too late.
[0455] A simple method to solve this problem is to compare T 'and Z instead of T and Z.
[0456] Here, T 'represents a time interval between the reception time and the transmission time of the most recent AP CSI-RS of the first OFDM symbol in the AP CSI report.
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58/89 [0457] In particular, if T '<Z, the UE updates the CSI and does not need to report the minor CQI.
[0458] In the case that requires more precise mechanism, Z 'which is less than Z is defined and, instead of T' and Z, T 'and Z' can be compared.
[0459] In other words, Z 'indicates the amount of time required for channel measurement, CSI calculation and TX preparation, except DCI decoding.
[0460] Z indicates the time that includes DCI decoding in addition to channel measurement, CSI calculation and TX preparation.
[0461] However, since the DCI decoding time does not necessarily need to be considered in T ', the time actually required for T' may be less than Z.
[0462] If sufficient time is not provided for T ', the UE has no measurement of a channel under consideration, and thus the UE can report the lowest CQI in a specific UCI field.
[0463] FIG. 16 illustrates an example of a single A-CSI to CSI reporting trigger having an aperiodic CSI-RS proposed by the present specification.
(Proposal 4) [0464] In the case of the A-CSI report trigger for single CSI that uses an AP CSI-RS, if T '<Z, the UE does not need to calculate the CSI and reports the lowest CQI.
[0465] Here, T 'represents a length of time between the most recent CSI-RS reception time and the transmission time of the first OFDM symbol for the AP CSI report.
[0466] In the case of A-CSI reporting trigger for a plurality of N CSI, if the UE is equipped with N parallel processors, the UE can use the same mechanism as in the single CSI trigger.
[0467] However, if more than N CSI is fired, the UE cannot
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59/89 complete the calculation of the entire triggered CSI.
[0468] In this case, a CSI relaxation method supported by the LTE system can be used again.
(Proposal 5) [0469] In other words, Proposal 5 reuses a relaxation method supported by the LTE system in the case of an A-CSI reporting trigger for a plurality of CSI.
[0470] The EU's ability to calculate CSI will now be described.
[0471] According to proposals 1 to 3 described above, the amount of time required for processing CSI is determined, which can be summarized as shown in Tables 8 and 9.
[0472] In other words, Table 8 provides Z values for normal UEs, which are reference values that must be supported by all UEs.
[0473] AND Table 9 provides Z values for advanced UEs; therefore, for a given numerology and CSI latency, the UE's ability is employed to report whether the Z values in Table 9 should be supported.
[0474] In addition, for the given numerology and CSI latency, the Z values in Table 9 must be equal to or less than the Z values in Table 8.
[0475] In addition, the value of Z'i, j needs to be added in relation to Z '.
[0476] The value Z'i, j represents the length of time required between the reception time of the most recent CSI-RS and the transmission time of the first OFDM symbol in the AP CSI report.
[0477] Table 8 illustrates an example of the CSI Z calculation time for normal UEs.
[Table 8]
CSI complexity Units 15 kHz SCS 30 kHz SCS 60 kHz SCS 120 kHz SCS Low latency CSI Symbols. Zi, i Z1.2 Z1.3 Z1.4 High CSI Symbols. Z2.1 Z2.2 Z2.3 Z2.4
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latency
[0478] Table 9 illustrates an example of CSI Z calculation time for
Advanced UEs.
[Table 9]
CSI complexity Units 15 kHz SCS 30 kHz SCS 60 kHz SCS 120 kHz SCS Low latency CSI Symbols. Zi, i Zl, 2 Zl, 3 Z1.4 High latency CSI Symbols. Z2.1 Z2.2 Z2.3 Z2.4
[0479] The proposals described above are summarized briefly as follows.
[0480] First, according to proposal 1, if T <Z for an A-CSI reporting trigger in relation to the single CSI, the UE does not need to update the CSI.
[0481] Here, T represents a length of time between the reception time of the last triggering DCI OFDM symbol and the transmission time of the first AP CSI report OFDM symbol.
[0482] And according to proposal 2, the UE does not need to measure a channel or interference due to a ZP / NZP CSI-RS received from 0 to Z symbols before the transmission time of the first AP CSI report OFDM symbol.
[0483] And according to proposal 3, when a P / SP / AP CSI-RS is used to conduct the CSI calculation for the A-CSI report, the time deviation of a CSI reference resource is derived of Z with respect to latency and CSI numerology given as follows.
[0484] In other words, nooi_ref is the smallest value greater than or equal to [[z / □], such that the n-nCoLi-ef partition corresponds to a valid downlink partition. This property can be applied in the same way to the P / SP CSI report.
[0485] And according to proposal 4, in the case of an A-CSI reporting trigger in relation to the single CSI that uses a CSI-RS AP, if T '<Z, the UE does not need to calculate the CSI and reports the lower channel quality indicator (CQI) for eNB.
[0486] Here, T 'represents a length of time between the reception time
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61/89 of the most recent AP CSI-RS and the transmission time of the first OFDM symbol in the AP CSI report.
[0487] And proposal 5 reuses a relaxation method supported by the LTE system in the case of an A-CSI reporting trigger for a plurality of CSI.
[0488] Then, another modality will be described.
[0489] The time deviation of a CSI reference resource is derived from Z'with respect to latency and CSI numerology provided as follows.
[0490] nCQI_ref is the smallest value greater than or equal to [Ζ '/ Λ ^ □ J, such that the n-nCQLref partition corresponds to a valid downlink partition.
[0491] Or nCQLref can be interpreted as the same as [ζ '/ ΛΖ / αα □] or be the smallest value among those values greater than [Ζ' / Λ ^ ππ □], such that the partition n-noQI_ref corresponds to a valid downlink partition. This property can also be applied to at least one aperiodic CSI report.
[0492] And this property is applied when an AP / P / SP CSI-RS is used for the calculation of CSI.
[0493] When a P / SP CSI-RS and / or CSI-IM is used for channel measurement or interference, the UE does not expect the last OFDM symbol to measure a channel and / or interference in relation to the CSI-RS and / or CSI -IM received from 0 to Z 'symbols before the transmission time of the first OFDM symbol in the AP CSI report.
[0494] The aforementioned property is not the only condition, and the CSI-RS must be defined on or before the CSI reference resource. This property also includes the case of AP CSI-RS.
[0495] In the case of the AP CSI report, when P / SP CSI-RS is used for channel measurement and / or interference, the UE does not expect the latest CSI-RS to be received later than the CSI reference before triggering the PDCCH.
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62/89 [0496] In Table 10 below, the values (Z, Z ') are reference values that must be supported by all UEs.
[0497] For normal UEs, it has not yet been determined whether the values (Z, Z ') in relation to low latency CSI and high latency CSI in Table 10 below are equal for each given numerology.
[0498] If the two values are the same for all numerology, low latency and high latency will be combined for normal UEs.
[0499] In Table 11 below, whether or not the values (Z, Z ') of Table 11 are supported in relation to the given numerology and latency of CSI, is reported to eNB through the capacity of the UE.
[0500] For the given numerology and CSI latency, the values (Z, Z ') in Table 11 are equal to or less than the values (Z, Z') in Table 10.
[0501] Table 10 illustrates the calculation time of CSI Z for normal UEs.
[Table 10]
CSI latency Units 15kHz SCS 30kHz SCS 60kHz SCS 120kHz SCS Low latency Symbols. (Zi, i, Z’1,1) (Z1,2, Z’1,2) (Z1.3, Z’1.3) (Z1,4, Z’1,4) High Latency Symbols. (Z2,1, Z’2,1) (Z2,2, Z’2,2) (Z2,3, Z’2,3) (Z2,4, Z’2,4)
[0502] Table 11 illustrates the calculation time of CSI Z for advanced UEs.
[Table 11]
CSI latency Units 15kHz SCS 30kHz SCS 60kHz SCS 120kHz SCS Low latency Symbols. (Zi, i, Z’1,1) (Z1,2, Z’1,2) (Z1.3, Z’1.3) (Z1,4, Z’1,4) High Latency Symbols. (Z2,1, Z’2,1) (Z2,2, Z’2,2) (Z2,3, Z’2,3) (Z2,4, Z’2,4)
[0503] As yet another modality, a mechanism related to the CSI report will be described later.
[0504] More specifically, CSI reporting timing and capacity
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63/89 of the UE related to it will be described.
[0505] In what follows, through Tables 12 and 13, specific values of (Z, Z ') will be examined for a normal UE and an advanced UE.
[0506] For the value of Z'of a normal UE, it is assumed that the UE performs the measurement / calculation of CSI and channel multiplexing; and CSI coding and modulation for the Z 'symbol.
[0507] Part of the measurement and calculation of CSI depends on numerology and requires 6 * 2 (μ-2) symbols; the remaining portions and CSI channel / encoding / modulation multiplexing uses 20 symbols for high latency and 13 symbols for low latency respectively.
[0508] As a result, Z for low latency and high latency is 13 + 6 * 2 ^Λ (μ-2) and 20 + 6 * 2 λ (μ-2).
[0509] For the Z value of a normal UE, it is assumed that a CSI-RS is located next to the symbol of a final PDCCH symbol.
[0510] In addition, it is assumed that CSI processing can start after DCI decoding.
[0511] DCI decoding time requires 4 + 10 * 2 λ (μ-2), including a portion that depends on numerology, such as PDCCH CE / demultiplexing / decoding and an independent portion of numerology.
[0512] As a result, Z is determined by the DCI decoding time + CSI processing time, namely 4 + 10 * 2 (μ-2) + Z '.
[0513] In the case of an advanced UE, since DCI decoding is conducted for 5 symbols, Z 'is 7 symbols and 14 symbols, respectively for low latency and high latency; and Z is Z '+ 5.
[0514] Table 12 represents the CSI calculation time (Z, Z ') for a normal UE.
[Table 12]
Latency Units 15kHz SCS 30kHz SCS 60kHz SCS 120kHz SCS
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CSI(μ = 0) (μ = 1) (μ = 2) (μ = 3) Low latency Symbols. (22, 15) (25, 16) (33, 19) (49, 25) High latency Symbols. (29, 22) (32, 23) (40, 26) (56, 32)
[0515] Table 13 represents the CSI calculation time (Z, Z ') for an advanced UE.
[Table 13]
CSI latency Units 15kHz SCS ⁽ μ = ⁰⁾ 30kHz SCS ⁽ μ = 1) 60kHz SCS(μ = 2) 120kHz SCS ⁽ μ = ³⁾ Low latency Symbols. (12, 7) (12, 7) (12, 7) (12, 7) High latency Symbols. (19, 14) (19, 14) (19, 14) (19, 14)
[0516] Several proposals related to the above descriptions will be examined.
[0517] The proposals to be described later may be applied separately from the proposals described above or applied in conjunction with the above mentioned proposals.
(Proposal 1 ') [0518] As the minimum required CSI processing time for a normal and advanced UE, the values (Z, Z') of Tables 12 and 13 above are selected, respectively.
[0519] Regarding CSI and data multiplexing, a remaining problem is the number of symbols required for a UE to complete CSI processing and data coding simultaneously.
[0520] When CSI and data are multiplexed, the allocation of a data resource element (RE) depends on a CSI payload; however, the size of the CSI / payload is varied according to the CRI / RI / amplitude coefficient other than 0, or the CSI default number.
[0521] As a result, CSI processing and data encoding may not be performed in a completely parallel manner.
[0522] More specifically, in the case of CSI type I, the CRI / RI of Part 1
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65/89 determines the payload size of CSI Part 2, such as PMI and CQI.
[0523] In the case of type II CSI, the number of non-zero amplitude coefficients of RI / CSI Part 1 determines the payload size of CSI Part 2, such as PMI and CQI.
[0524] Therefore, when CSI and data are multiplexed, instead of (Z, Z '), the UE requires at least the symbol (Z + C, Z' + C) to prepare CSI and data simultaneously.
[0525] Here, C is less than or equal to N2.
(Proposal 2 ') [0526] When the AP CSI and the data for a PUSCH are multiplexed, the UE is not expected to receive the programming DCI with a symbol offset such that M-L-N <Z + C.
[0527] Here, L represents the last symbol of a PDCCH that triggers an A-CSI report, L is a start symbol for a PUSCH, N is a TA value in symbol units and C is equal to or less than N2.
(Proposal 3 ') [0528] When AP CSI and data for a PUSCH are multiplexed, and an AP CSI-RS is used for channel measurement, the UE is not expected to receive programming DCI having a symbol offset such that MON <Z '+ C.
[0529] Here, N represents a value of TA in symbol units; The represents a value that arrives late between the last symbol of an AP CSI-RS resource for a CMR, the last symbol of an NZP CSI-RS aperiodic for an IM (if any) and the last symbol of an aperiodic CSI-IM (if it exists); and C is equal to or less than N2.
[0530] In addition, when AP CSI and data for a PUSCH are multiplexed, although the time position of a CSI reference resource is determined in the same way for the AP CSI case, the time position is
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66/89 determined based on Z '+ C instead of Z'.
(Proposal 4 ') [0531] When the AP CSI and the data for a PUSCH are multiplexed, a time deviation of a CSI reference resource is derived from Z' + C in relation to a given CSI latency and numerology .
[0532] The time deviation of a CSI reference resource is derived from Z 'with respect to a given CSI latency and numerology as follows.
[0533] nooLref is the smallest value greater than or equal to [(Z '+ C) / N ^ _b , such that the n-neoLref partition corresponds to a valid downlink partition.
[0534] When a P / SP CSI-RS and / or CSI-IM is used for channel measurement and / or interference measurement, the UE does not expect the last OFDM symbol to measure a channel and / or interference in relation to the CSI -RS and / or CSI-IM received from 0 to Z '+ C symbols before the transmission time of the first OFDM symbol in an AP CSI report.
[0535] Another issue is the calculation time of a beam report, that is, CRI and received power of layer 1 reference signal (L1 RSRP).
[0536] When L1 RSRP is a single port energy measurement, and the same calculated power is used for a CSI report and a beam report, it is preferable to consider RSRP L1 as a low latency CSI.
[0537] In addition, to reduce the complexity of the calculation, the number of CSI-RS resources for a beam report can be limited.
(Proposal 5 ') [0538] The same (Z, Z') is applied to a low latency CSI beam report as in the CSI report.
[0539] Then, in the case of an A-CSI report trigger for a plurality of N CSI, if the UE is equipped with X and X parallel processors
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67/89> N, the same mechanism as a single CSI reporting trigger can be used without relaxation.
[0540] However, if more than X CSIs are triggered, the UE will be unable to complete the calculation for all CSIs triggered.
[0541] In this case, a relaxation method supported in the LTE system can be reused.
[0542] In particular, if the UE does not have an unreported CSI and N> X, the UE does not necessarily have to calculate N-X CSI (s).
(Proposal 6 ') [0543] In the case of an A-CSI reporting trigger for a plurality of CSI, a relaxation method supported in the LTE system can be reused.
[0544] More specifically, if the UE is equipped with X parallel CSI processors and has N CSI (s) not reported, and N> X, the UE does not necessarily have to update the latest N-X CSI (s).
[0545] Regarding the time position of a reference resource for the P / SP CSI report, the same method for the time position of a reference resource for the AP CSI report can be applied.
(Proposal 7 ') [0546] The reference resource time position for the P / SP CSI report can be determined by the same method for the reference resource time position for the AP CSI report.
[0547] The details related to CSI relaxation will be described in more detail.
[0548] X represents the capacity for the maximum number of CSIs that can be updated simultaneously.
[0549] If the N (> X) CSI processing time intervals of CSI reports overlap each other in the time domain, the UE will not
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68/89 needs to update N-X CSI reports.
[0550] A CSI processing time interval is a time interval that varies from the beginning of an S symbol to the last of an E symbol.
[0551] Here, with respect to periodic and semi-persistent CSI reports, [0552] (1) In the case of Alt. 1, [0553] S is a symbol of the beginning of a CQI reference resource partition.
[0554] (2) In the case of Alt. 2, [0555] S is E-Z '(or E - (Z' + 1)) and E is a start symbol for a CSI report.
[0556] Since NR defines the location of a measurable CSI-RS channel at the symbol level (in other words, a CSI-RS located on a symbol below EZ 'or on a symbol below E- (Z' + 1) is measured), Alt. 2 proposes the last hour when CSI processing can be started.
[0557] In other words, the UE can start processing CSI at time S of Alt. 2 at the latest.
[0558] (3) In the case of Alt. 3, [0559] S is the location of the start symbol for a CSI report - Z '(or start symbol for a CSI report - (Z' + 1)) or the last CSI-RS symbol (which is used to calculate the corresponding CSI) received at the most recent time point between the time points before the start symbol.
[0560] Once the UE starts calculating CSI using the CSI-RS at the aforementioned time point, the UE is appropriate for S and satisfies that E = S + Z '.
[0561] Next, in relation to a CSI report and a CSI-IM with a periodic or semi-persistent CSI-RS, [0562] (1) In the case of Alt. 1,
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69/89 [0563] If a reference feature is located before a PUCCH with an aperiodic CSI trigger, S will become the last PDCCH symbol with an aperiodic CSI trigger and E = S + Z.
[0564] Otherwise, S = E-Z 'and E is the start symbol for a CSI report.
[0565] (2) In the case of Alt. 2, [0566] If the start symbol for a CSI report - Z '(or start symbol for a CSI report - (Z' + 1)) is located before PDCCH with aperiodic CSI trigger, S is the last symbol with aperiodic CSI trigger (or S is the last PDCCH symbol with aperiodic CSI trigger + 1), and E = S + Z.
[0567] In other words, if a measurable CSI-RS is received before the PDCCH, the UE can start calculating the CSI after receiving the PDCCH.
[0568] Since the minimum time required before a CSI report is completed after receipt of the PDCCH is Z, the time in which the CSI calculation is completed becomes S + Z.
[0569] Otherwise, S is E-Z '(or E- (Z' + 1)) and E is the start symbol for a CSI report.
[0570] In other words, if a measurable CSI-RS is received after the PDCCH, the UE can start calculating the CSI after receiving the CSI-RS.
[0571] Since the minimum time required until the CSI report is completed after receipt of the CSI-RS is Z ', the time in which the CSI calculation is completed becomes S + Z'.
[0572] (3) In the case of Alt. 3, [0573] Suppose the most recent CSI-RS received on or before the CSI report start symbol - Z '(or CSI report start symbol (Z '+ 1)) is a “reference CSI-RS”. If the last symbol of a reference CSI-RS is located before the PDCCH with aperiodic CSI trigger, S if
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70/89 will make the last PDCCH symbol with aperiodic CSI trigger (or last PDCCH symbol with aperiodic CSI trigger + 1), and E = S + Z [0574] In other words, if a measurable CSI-RS is received before the PDCCH, the UE can start the CSI calculation after receiving the PDCCH.
[0575] Since the minimum time required for a CSI report to be completed after receipt of the PDCCH is Z, the time in which the CSI calculation is completed becomes S + Z.
[0576] Otherwise, S = E-Z '(or E- (Z' + 1)) and E is the start symbol for a CSI report.
[0577] In other words, if a measurable CSI-RS is received after the PDCCH, the UE can start calculating the CSI after receiving the CSI-RS.
[0578] Since the minimum time required for a CSI report to be completed after receiving the CSI-RS is Z ', the time in which the CSI calculation is completed becomes S + Z'.
[0579] Otherwise, S = E-Z '(or E- (Z' + 1)) and E is the start symbol for a CSI report.
[0580] In other words, if a measurable CSI-RS is received after the PDCCH, the UE can start calculating the CSI after receiving the CSI-RS.
[0581] Since the minimum time required for a CSI report to be completed after receipt of the CSI-RS is Z ', the time in which the CSI calculation is completed becomes S + Z' [0582] ( 4) In the case of Alt. 4, [0583] S is EZ '(or E- (Z' + 1)) and E is the start symbol for a CSI report.
[0584] Next, in relation to an aperiodic CSI report with an aperiodic CSI-RS and a CSI-IM, [0585] S1 is the last symbol of a PDCCH with aperiodic CSI trigger.
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71/89 [0586] S2 is the symbol that follows between the last symbol of an aperiodic CSI-RS in relation to a CMR, the last symbol of the aperiodic CSI-RS in relation to an IMR, and the last symbol of the CSI- Aperiodic IM.
[0587] (1) In the case of Alt. 1, [0588] If S1 + Z> S2 + Z '(in other words, if the location of an OFDM symbol added by z symbols in S1 is after the location of the OFDM symbol added by z 'symbols in S2), S = S1 and E = S1 + Z [0589] Otherwise, S = S2 and E = S2 + Z'.
[0590] The UE ends the processing of CSI at a later time between S1 + Z and S2 + Z '.
[0591] Therefore, E is defined as the more recent of the two, and the start time of which is completed later between the two is considered the start of CSI processing.
[0592] (2) In the case of Alt. 2, [0593] It is defined in such a way that S = S2.
[0594] If S1 + Z> S2 + Z (in other words, if the location of an OFDM symbol added by z symbols in S1 is after the location of the OFDM symbol added by z 'symbols in S2), E = S1 + Z Otherwise, E = S2 + Z '.
[0595] Here, the final CSI processing time in Alt. 2 is the same as in Alt. 1, but the start time is fixed at S2, which is used for channel and / or interference estimation.
[0596] This is because an AP CSI-RS is always restricted to be received after receiving a PDCCH, in which case the UE is able to start processing CSI at least when the reception of the CSI-RS is completed .
[0597] (3) In the case of Alt. 3, [0598] S is E-Z '(or E- (Z' + 1)) and E is the start symbol for a
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CSI.
[0599] When CSI is calculated using a P / SP CSI-RS and / or CSI Interference Measurement (IM), a plurality of measurable CSI-RSs can exist in the time domain.
[0600] The UE can calculate the CSI by measuring a CSI-RS received as recently as possible against a CSI reporting time, thereby obtaining renewal CSI.
[0601] At this time, too, a CSI-RS located before the reporting time - Z 'has to be measured taking into account the calculation time of the CSI of the UE.
[0602] However, if the CSI calculation time (which is called 'CSI 1') overlaps with another CSI calculation time (which is called 'CSI 2'), and the number of CSIs that can be calculated at the same time it is exceeded, the UE is unable to calculate part of the CSIs.
[0603] To solve the above problem, the calculation time of CSI 1 can be placed before a time so that it is not overlapped with CSI 2.
[0604] This is possible since CSI 1 is calculated using a P / SP CSI-RS and / or CSI-IM, a plurality of P / SP CSI-RSs and / or CSI-IMs exists along the axis of therefore, CSI 1 can be calculated in advance using the P / SP CSI-RS and / or CSI-IM received previously.
[0605] However, it should be noted that if CSI 1 is calculated too early, a potential range is introduced to avoid a situation where the CSI is out of date, and CSI 1 can be calculated in advance using the CSIRS P / SP and / or or CSI-IM received within the potential range.
[0606] A potential range (namely the N value proposed below) can be determined by eNB and indicated for the UE; or the UE can determine the potential range and report the determined potential range to the eNB.
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73/89 [0607] The potential interval ends at reporting time - Z and starts at the end time - N time.
[0608] When a plurality of CSIs is reported through the same PUSCH, channel multiplexing / encoding / modulation is performed simultaneously with a plurality of corresponding CSIs and therefore less time is required than the case in that a plurality of CSIs is reported through a different PUSCH.
[0609] Therefore, when a plurality of CSIs are reported through the same PUSCH, one of the CSIs requires CSI T processing time, but the remaining CSI (s) requires only the time required for “multiplexing / encoding / modulating T channel ”.
[0610] Therefore, when the processing time is set for CSI relaxation, the remaining CSI is defined as “multiplexing / encoding / modulating T channel” and, as a result, the possibility of processing time overlapping another CSI can be reduced.
[0611] And when the channel and / or interference is measured using a periodic or semi-persistent CSI-RS, there may be a plurality of CSI-RS measurable over the time axis.
[0612] In this case, the UE calculates CSI by measuring an existing CSI-RS symbol before Z '(or Z' + 1) with reference to the first OFDM symbol that starts the CSI report.
[0613] Therefore, the last moment when the UE measures the CSI for the calculation of the CSI becomes “the symbol before Z” (or Z '+ 1) symbols with reference to the first OFDM symbol that starts the CSI report ”.
[0614] Therefore, it is preferable to define the start time of CSI processing as “the symbol before Z” (or Z '+ 1) with reference to the first OFDM symbol that starts the CSI report ”.
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74/89 [0615] And it is preferable to define the end time of the CSI processing as the first OFDM symbol that starts the CSI report.
[0616] On the other hand, when the channel and / or interference is measured using an aperiodic CSI-RS, a measurable CSI-RS may exist along the time axis.
[0617] Therefore, it is preferable to define the start time of CSI processing as "the last symbol at which an AP CSI-RS and / or AP CSI-IM is received".
[0618] In the case of periodic or semi-persistent CSI reports, a reporting time is defined in advance.
[0619] Therefore, the UE knows the location of an existing CSI-RS symbol before Z '(or Z' + 1) with reference to the first OFDM symbol that starts the CSI report.
[0620] Therefore, since the calculation can be started from the corresponding CSI-RS, S becomes the last OFDM symbol of the corresponding CSI-RS and E becomes S + Z '.
[0621] In the case of AP CSI reports, when an AP CSI-RS is used, a CSI-RS used for calculating the CSI exists along the time axis.
[0622] It should be noted that, since a CSI-RS for uses of CMR is different from a CSI-RS for uses of IMR, there is a CSI-RS for each use along the time axis.
[0623] Therefore, since the calculation can be started from the corresponding CSI-RS, S becomes the last OFDM symbol of the corresponding CSI-RS and E becomes S + Z '.
[0624] In the case of the AP CSI report, when a P / SP CSI-RS is used, the most recent CSI-RS used for the CSI calculation can be received before DCI.
[0625] Therefore, if the last OFDM symbol of the corresponding CSI-RS is set to S, the UE starts calculating the CSI at a time
Petition 870190038964, of 25/04/2019, p. 83/122
75/89 where it is uncertain whether the corresponding CSI can be triggered or not.
[0626] If the corresponding CSI is not triggered, the UE wastes computing power and a problem may arise, such that the corresponding computing power is not used for another CSI calculation.
[0627] To solve the above problem, S is defined in such a way that S = EZ'e E is defined as the first symbol of the CSI PUSCH report.
[0628] Various combinations are possible for S and E proposed in the different Alt.s above, and corresponding combinations are also applicable to a method proposed by the present specification.
[0629] For example, S and E can be determined by the S of Alt. 1 and the E of Alt. 2 [0630] E in proposals 2 and 3 above, Z 'can be replaced by Z'-1.
[0631] As the UE may still be able to calculate the CSI, even if the time of Z 'is given, which ranges from a CSI-RS and / or CSI-IM to the start symbol of the CSI report, Z' can be replaced by Z'-1.
[0632] For the same reason, in proposal 4 above, Z 'can be replaced by Z'-1.
[0633] Next, the CSI calculation will be described in more detail from the point of view of implementation.
[0634] Two implementations of a CSI processor that is responsible for calculating the CSI are available.
[0635] Type A corresponds to a serial processor.
[0636] The UE can have X CSI processing units (type A) and a minimum time required to calculate a CSI can be defined as (Z, Z ').
[0637] When the UE can simultaneously calculate CSIs of X or less and in this case, the required time needs to be calculated sequentially for X CSIs one by one, a minimum time of a sum (for example, sum Z ') of a value
Petition 870190038964, of 25/04/2019, p. 84/122
76/89 (Z, Z ') corresponding to each of the X CSIs is required.
[0638] When the locations of X CSI-RSs or CSI-IMs are the same, it is determined whether a given calculation time is sufficient according to a time when a sum of Z 'is added at the location of the CSI-RS and / or CSI-IM (a last symbol of CSI-RS and / or CSI-IM or a first symbol of CSI-RS and / or CSIIM) is before or after the report.
[0639] When sufficient time is given, the UE updates the CSI and reports the CSI to the eNB.
[0640] Otherwise, the UE does not update the CSI, transmit a fictitious CSI or ignore the trigger and transmit nothing to the eNB.
[0641] When the locations of X CSI-RSs or CSI-IMs are different from each other, it is determined whether a given calculation time is sufficient according to a time when a sum of Z 'is added at the location of the symbol of the CSI -RS and / or CSI-IM that is most recently received is before or after the report.
[0642] Since the eNB has a degree of freedom in which the locations of X CSI-RSs / CSI-IMs can be configured differently, it is necessary to determine whether the calculation time provided is sufficient for a last scheme.
UE and eNB Operation Methods [0643] In the following, the UE and eNB operations to carry out the method proposed by the present invention will be described, will be described with reference to FIGS. 17 to 22.
[0644] FIG. 17 is a flow chart illustrating an example of a method of operating a UE that performs a CSI report proposed by the present invention.
[0645] First, the UE receives a radio resource control (RRC) signal from eNB, including one or more report settings.
Petition 870190038964, of 25/04/2019, p. 85/122
77/89 [0646] Here, the report adjustment includes the first values that indicate a time deviation for the CSI report.
[0647] The first value can be expressed as Y.
[0648] The CSI report can be an aperiodic CSI report.
[0649] In addition, the UE receives eNB downlink control information (DCI) to trigger the CSI report (S1720).
[0650] The DCI includes control information for a transmission time point of a shared physical uplink channel (PUSCH).
[0651] The control information can be represented by n bit (s). Here, n is a natural or non-negative integer.
[0652] For example, when the control information is represented by 2 bits, each status value can be 00, 01, 10 or 11.
[0653] Furthermore, when a plurality of report adjustments are triggered by the DCI, the UE determines a larger value among the first values corresponding to the control information in lists for the first values of the plurality of report adjustments as a second value ( S1730).
[0654] 00 can correspond to a first entry in the list for the first values, 01 can correspond to a second entry in the list for the first values, 10 can correspond to a second entry in the list for the first values and 11 can correspond to a fourth entry in the list for the first values.
[0655] In addition, the UE reports CSI to eNB in PUSCH based on the second value (S1740).
[0656] DCI can be received on partition n and CSI can be reported on partition (n + second value).
[0657] The operation of the UE of FIG. 17 can be interpreted as follows.
Petition 870190038964, of 25/04/2019, p. 86/122
78/89 [0658] The UE receives a radio resource control (RRC) signal from a base station that comprises a plurality of report settings, where each report setting comprises a corresponding list of first values representing time deviations to transmit a CSI report, forming a plurality of lists of the first values.
[0659] And, the UE receives, from the base station, downlink control (DCI) information that triggers the CSI report, in which the DCI comprises an index value related to a time in which to transmit the CSI report in a shared physical uplink channel (PUSCH).
[0660] And, the UE determines, based on the DCI, a plurality of list entries determining, for each list in the plurality of lists of first values, a corresponding list entry that is indexed in the list based on the index value.
[0661] And, the UE determines a second value that is greater among the plurality of list entries.
[0662] And, the UE transmits the CSI report on the PUSCH to the base station based on the second value.
[0663] Here, the CSI report comprises an aperiodic CSI report.
[0664] Additionally, the UE can receive the DCI on an n partition and transmit the CSI report on an n + partition (second value).
[0665] The index value is represented by 2 bits and the index value is represented by one of 00, 01, 10 or 11.
[0666] More specifically, the index value of 00 corresponds to a first entry in each of the plurality of lists of first values, the index value of 01 corresponds to a second entry in each of the plurality of lists of first values, the index value of 10 corresponds to a third entry in each of the plurality of lists of first values, and the index value 11 corresponds to a fourth entry in each of the plurality of lists
Petition 870190038964, of 25/04/2019, p. 87/122
79/89 of first values.
[0667] Here, the index value can be greater than or equal to zero and each list entry is indexed in the corresponding list of the first values in a position corresponding to 1+ (index value) in the list.
[0668] FIG. 18 is a flow chart illustrating an example of a method of operating an eNB that receives a CSI report proposed by the present invention.
[0669] First, the eNB receives radio resource control (RRC) signaling from the UE, including one or more report adjustments.
[0670] Here, the report configuration includes the list of the first values that indicate the time deviation for the CSI report.
[0671] The first value can be expressed as Y.
[0672] The CSI report can be the aperiodic CSI report.
[0673] In addition, eNB transmits downlink control information (DCI) to the UE to trigger the plurality of report definitions (S1820).
[0674] The DCI includes control information for a transmission time point of a shared physical uplink channel (PUSCH).
[0675] The control information can be represented by n bit (s). Here, n is a natural or non-negative integer.
[0676] For example, when the control information is represented by 2 bits, each status value can be 00, 01, 10 or 11.
[0677] In addition, eNB receives the CSI report from the UE on the PUSCH (S1830).
[0678] The CSI report can be associated with the second value and the second value can be the largest value among the first values corresponding to the control information in the lists for the first values of the plurality of report adjustments.
Petition 870190038964, of 25/04/2019, p. 88/122
80/89 [0679] 00 can correspond to a first entry in the list for the first values, 01 can correspond to a second entry in the list for the first values, 10 can correspond to a second entry in the list for the first values and 11 can correspond to a fourth entry in the list for the first values.
[0680] DCI can be received on partition n and CSI can be reported on partition (n + second value).
[0681] The operation of the eNB of FIG. 18 can be interpreted as follows.
[0682] The eNB transmits, to a UE, a radio resource control (RRC) signal that comprises a plurality of report settings, where each report setting comprises a corresponding list of first values that represent time deviations for transmit a CSI report, forming a plurality of lists of first values.
[0683] And, the eNB transmits downlink control information (DCI) to the UE that triggers the CSI report, in which the DCI comprises an index value related to a time in which to transmit the CSI report in a shared physical uplink channel (PUSCH).
[0684] And, the eNB receives, from the UE, the CSI report on the PUSCH based on the second value.
[0685] Here, the second value that is greater among the plurality of list entries.
[0686] And, the plurality of list entries can be determined by a plurality of list entries by determining, for each list in the plurality of first value lists, a corresponding list entry that is indexed in the list.
[0687] Here, the CSI report comprises an aperiodic CSI report.
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81/89 [0688] In addition, the DCI can receive on an n partition and the CSI report is transmitted on an n + partition (second value).
[0689] The index value is represented by 2 bits and the index value is represented by one of 00, 01, 10 or 11.
[0690] More specifically, the index value of 00 corresponds to a first entry in each of the plurality of first value lists, the index value of 01 corresponds to a second entry in each of the plurality of first value lists, the index value of 10 corresponds to a third entry in each of the plurality of first value lists, and the index value 11 corresponds to a fourth entry in each of the plurality of first value lists.
[0691] Here, the index value can be greater than or equal to zero and each entry in the list is indexed in the corresponding list of the first values in a position corresponding to 1+ (index value) in the list.
[0692] Referring to Figs. 19 to 22 to be described below, a process of implementing the method for reporting the CSI proposed by the present invention in the UE will be described in more detail.
[0693] That is, the UE comprises a radio frequency (RF) module, at least one processor, and at least one computer memory operably connectable to at least one processor and storing instructions that, when executed, cause at least one processor performs operations comprising: receiving, from a base station, a radio resource control (RRC) signal that comprises a plurality of report settings, each report setting comprising a corresponding list of first values representing time deviations to transmit a CSI report, forming a plurality of lists of the first values; receive, from the base station, downlink control information (DCI) that triggers the
Petition 870190038964, of 25/04/2019, p. 90/122
82/89
CSI, where the DCI comprises an index value related to the transmission time of the CSI report on a physical shared uplink channel (PUSCH); determine, based on the DCI, a plurality of list entries by determining, for each list in the plurality of first value lists, a corresponding list entry that is indexed in the list based on the index value; determining a second value that is greater among the plurality of list entries; and transmit, to the base station, the CSI report on the PUSCH based on the second value.
[0694] Here, the CSI report comprises an aperiodic CSI report.
[0695] Additionally, the UE can receive the DCI on an n partition and transmit the CSI report on an n + partition (second value).
[0696] The index value is represented by 2 bits and the index value is represented by one of 00, 01, 10 or 11.
[0697] More specifically, the index value of 00 corresponds to a first entry in each of the plurality of lists of first values, the index value of 01 corresponds to a second entry in each of the plurality of lists of first values, the index value of 10 corresponds to a third entry in each of the plurality of first value lists, and the index value 11 corresponds to a fourth entry in each of the plurality of first value lists.
[0698] Here, the index value can be greater than or equal to zero, and each entry in the list is indexed in the corresponding list of the first values in a position corresponding to 1+ (index value) in the list.
[0699] Referring to Figs. 19 to 22 to be described below, a process of implementing the method for reporting the CSI proposed by the present invention in eNB will be described in more detail.
[0700] That is, the UE comprises a radio frequency (RF) module, at least
Petition 870190038964, of 25/04/2019, p. 91/122
83/89 at least one processor, and at least one computer memory operably connectable to at least one processor and storing instructions that, when executed, cause at least one processor to perform operations comprising: transmitting a control signal to a UE radio resource (RRC) comprising a plurality of report settings, with each report setting comprising a corresponding list of first values that represent time deviations for transmitting a CSI report, forming a plurality of first value lists; transmit downlink control information (DCI) to the UE that triggers the CSI report, where the DCI comprises an index value related to a time at which to transmit the CSI report on a shared uplink channel (PUSCH) ); and receive, from the UE, the CSI report on the PUSCH based on the second value.
[0701] Here, the CSI report comprises an aperiodic CSI report.
[0702] In addition, the DCI can receive on an n partition and the CSI report is transmitted on an n + partition (second value).
[0703] The index value is represented by 2 bits and the index value is represented by one of 00, 01, 10 or 11.
[0704] More specifically, the index value of 00 corresponds to a first entry in each of the plurality of lists of first values, the index value of 01 corresponds to a second entry in each of the plurality of lists of first values, the index value of 10 corresponds to a third entry in each of the plurality of first value lists, and the index value 11 corresponds to a fourth entry in each of the plurality of first value lists.
[0705] Here, the index value can be greater than or equal to zero and each entry in the list is indexed in the corresponding list of the first values in a position corresponding to 1+ (index value) in the list.
Petition 870190038964, of 25/04/2019, p. 92/122
84/89
Overview of Devices to which the Present Invention Applies [0706] FIG. 19 illustrates a block diagram of a wireless communication device to which the methods proposed in the present invention can be applied.
[0707] Referring to FIG. 19, a wireless communication system includes an eNB 1910 and several 1920 UEs positioned within an area of the eNB.
[0708] Each of the eNBs and the UE can be expressed as a wireless device.
[0709] The eNB includes a 1911 processor, a 1912 memory and a 1913 radio frequency (RF) module. The 1911 processor implements a function, process and / or method that is proposed in FIGS. 1 to 18 above. Layers of a radio interface protocol can be implemented by the processor. The memory is connected to the processor to store various information for triggering the processor. The RF module is connected with the processor to transmit and / or receive a radio signal.
[0710] The UE includes a 1921 processor, a 1922 memory and a 1923 RF module.
[0711] The processor implements a function, process and / or method that is proposed in FIGS. 1 to 18 above. Layers of a radio interface protocol can be implemented by the processor. The memory is connected to the processor to store various information for triggering the processor. The RF module is connected with the processor to transmit and / or receive a radio signal.
[0712] The memories 1912 and 1922 can be positioned inside or outside the processors 1911 and 1921 and connected to the processor by several well-known means.
[0713] In addition, the eNB and / or the UE may have a single antenna or
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85/89 multiple antennas.
[0714] Antennas 1914 and 1924 are used to transmit and receive radio signals.
[0715] FIG. 20 illustrates a block diagram of a communication device according to an embodiment of the present invention.
[0716] In particular, FIG. 20 is a diagram that more specifically illustrates the UE of FIG. 19 above.
[0717] Referring to FIG. 20, the UE can be configured to include a processor (or digital signal processor (DSP) 2010, an RF module (or RF unit) 2035, a power management module 2005, an antenna 2040, a battery 2055, a 2015 display, a 2020 keyboard, a 2030 memory, a 2025 subscriber identification module (SIM) card (this component is optional), a 2045 speaker and a 2050 microphone. The UE can also include a single antenna or multiple antennas .
[0718] The 2010 processor implements a function, process and / or method that are proposed in FIGS. 1 to 18 above. Layers of a radio interface protocol can be implemented by the processor.
[0719] The 2030 memory is connected to the processor and stores information related to a processor operation. The memory can be positioned inside or outside the processor and connected to the processor by several well-known means.
[0720] A user enters command information, such as a phone number or the like, for example, by pressing (or touching) a key on the 2020 keyboard or activating voice using the 2050 microphone. The processor receives this command information and processes to perform the appropriate functions including dialing a phone number. Operational data can be extracted from the SIM card 2025 or memory 2030. In addition, the processor can
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86/89 display command information or drive information on the 2015 display for the user to recognize and for convenience.
[0721] The RF 2035 module is connected with the processor to transmit and / or receive an RF signal. The processor transfers the command information to the RF module to initiate communication, for example, to transmit radio signals that constitute voice communication data. The RF module consists of a receiver and a transmitter to receive and transmit radio signals. The 2040 antenna works to transmit and receive radio signals. Upon receiving the radio signals, the RF module can transfer the signal for processing by the processor and convert the signal to a base band. The processed signal can be converted into audible or readable information output via speaker 2045.
[0722] FIG. 21 is a diagram illustrating an example of an RF module of the wireless communication device to which the method proposed in the present invention can be applied.
[0723] Specifically, FIG. 21 illustrates an example of an RF module that can be implemented in a frequency division duplex (FDD) system.
[0724] First, in a transmission path, the processors described in FIGS. 19 and 20 process the data to be transmitted and provide an analog output signal for transmitter 2110.
[0725] Inside the transmitter 2110, the analog output signal is filtered by a low-pass filter (LPF) 2111 to remove images caused by a digital to analog conversion (ADC) and converted to an RF from a base band by a converter (mixer) 2112, and amplified by a variable gain amplifier (VGA) 2113 and the amplified signal is filtered by a filter 2114, further amplified by a power amplifier (PA) 2115, routed through one (s) duplexer (s) 2150 / an antenna switch (s) 2160, and
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87/89 transmitted through a 2170 antenna.
[0726] In addition, in a reception path, the antenna receives signals from outside and provides the received signals, which are routed through the antenna switches 2160 / duplexers 2150 and provided to a receiver 2120.
[0727] At receiver 2120, the received signals are amplified by a low noise amplifier (LNA) 2123, filtered by a bandpass filter 2124 and converted downwards from the RF to the baseband by a downstream converter (mixer) 2125.
[0728] The down-converted signal is filtered by a low-pass filter (LPF) 2127 and amplified by a VGA 1127 to obtain an analog input signal, which is provided to the processors described in FIGS. 19 and 20.
[0729] In addition, a local oscillator (LO) generator 2140 also provides LO signals transmitted and received for the upstream converter 2112 and the downstream converter 2125, respectively.
[0730] In addition, a loop locked by phase (PLL) 2130 receives control information from the processor to generate the LO signals transmitted and received at the appropriate frequencies and provides control signals to the LO 2140 generator.
[0731] In addition, the circuits illustrated in FIG. 21 can be arranged differently from the components illustrated in FIG. 21 [0732] FIG. 22 is a diagram illustrating another example of the RF module of the wireless communication device to which the method proposed in the present invention can be applied.
[0733] Specifically, FIG. 22 illustrates an example of an RF module that can be implemented in a time division duplex (TDD) system.
[0734] A transmitter 2210 and receiver 2220 of the RF module in the TDD system are identical in structure to the transmitter and receiver of the RF module in the FDD system.
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88/89 [0735] Hereinafter, only the structure of the RF module of the TDD system that differs from the RF module of the FDD system will be described and the same structure will be described with reference to a description of FIG. 21 [0736] A signal amplified by a 2215 power amplifier (PA) from the transmitter is routed through a 2250 band selection switch, a 2270 bandpass filter (BPF) and an 2280 antenna switch (s) and transmitted through of a 2280 antenna.
[0737] Furthermore, in a reception path, the antenna receives signals from the outside and provides the received signals, which are routed through the antenna switch (s) 2270, the band pass filter 2260, and the band selection switch 2250 and provided for the 2220 receiver [0738] In the embodiments described above, the components and features of the present invention are combined in a predetermined form. Each component or feature should be considered as an option, unless expressly stated otherwise. Each component or feature can be implemented to not be associated with other components or features. In addition, the modality of the present invention can be configured by associating some components and / or resources. The order of operations described in the modalities of the present invention can be changed. Some components or resources of any modality can be included in another modality or replaced by the component and the corresponding resource in another modality. It is evident that claims that are not expressly cited in claims that are combined to form a modality or be included in a new claim for an amendment after filing.
[0739] The modalities of the present invention can be implemented by hardware, firmware, software or combinations thereof. In the case of hardware implementation, according to the hardware implementation, the
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The exemplary modality described here can be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), arrays field programmable ports (FPGAs), processors, controllers, microcontrollers, microprocessors and the like.
[0740] In the case of implementation by firmware or software, the modality of the present invention can be implemented in the form of a module, a procedure, a function and the like to perform the functions or operations described above. A software code can be stored in memory and executed by the processor. The memory can be positioned inside or outside the processor and can transmit and receive data to / from the processor by several elements.
[0741] It is evident to those skilled in the art that the present invention can be realized in other specific forms without departing from the essential characteristics of the present invention. Consequently, the detailed description mentioned above should not be interpreted as restrictive in all terms and should be considered as an example. The scope of the present invention is to be determined by rational interpretation of the appended claims and all modifications within an equivalent scope of the present invention are included within the scope of the present invention.
[Industrial Applicability] [0742] This document discloses a method for reporting CSI in a wireless communication system with examples based on the 3GPP LTE / LTE-A system and the 5G system (Novo RAT System); however, the present invention can be applied to several other types of wireless communication, in addition to the 3GPP LTE / LTE-A system and the 5G system.

权利要求:
Claims (12)
[1]
1. Method for reporting, by user equipment (EU) (1920), channel status information (CSI) in a wireless communication system, the CHARACTERIZED method because it comprises:
receive (S1710), from a base station (1910), a radio resource control (RRC) signal that comprises a plurality of report settings, where each report setting comprises a corresponding list of first values that represent deviations from time to transmit a CSI report, forming a plurality of lists of first values;
receive (S1720), from the base station (1910), downlink control information (DCI) that triggers the CSI report, in which the DCI comprises an index value related to a time in which to transmit the CSI report in a shared physical uplink channel (PUSCH);
determining (S1730), based on the DCI, a plurality of list entries determining, for each list in the plurality of first value lists, a corresponding list entry that is indexed in the list based on the index value;
determining (S1730) a second value that is greater among the plurality of list entries; and transmit (S1740), to the base station (1910), the CSI report on the PUSCH based on the second value.
[2]
2. Method according to claim 1, CHARACTERIZED by the fact that the CSI report comprises an aperiodic CSI report.
[3]
3. Method according to claim 1, CHARACTERIZED by the fact that receiving (S1720) the DCI comprises receiving the DCI in a partition n and in which to transmit (S1740) the CSI report comprises transmitting the CSI report in an n + partition (second value).
[4]
4. Method according to claim 1, CHARACTERIZED by the fact that
Petition 870190140652, of 12/27/2019, p. 9/12
2/4 that the index value is represented by 2 bits and where the index value is represented by one of 00, 01, 10 or 11.
[5]
5. Method according to claim 4, CHARACTERIZED by the fact that:
the index value of 00 corresponds to a first entry in each of the plurality of lists of first values, the index value of 01 corresponds to a second entry in each of the plurality of lists of first values, the index value of 10 corresponds to a third entry in each of the plurality of first value lists, and the index value 11 corresponds to a fourth entry in each of the plurality of first value lists.
[6]
6. Method according to claim 1, CHARACTERIZED by the fact that the index value is greater than or equal to zero, and in which each list entry is indexed in the corresponding list of the first values in a position corresponding to 1 + (value index) in the list.
[7]
7. User equipment (UE) (1920) configured to report channel status information (CSI) in a wireless communication system, the UE (1920) FEATURED by the fact that it comprises:
a radio frequency (RF) module (1923, 2035);
at least one processor (1921,2010); and at least one computer memory (1922, 2030) operably connectable to at least one processor and storing instructions that, when executed, cause at least one processor to perform operations comprising:
receive (S1710), from a base station (1910), a radio resource control (RRC) signaling comprising a plurality of
Petition 870190140652, of 12/27/2019, p. 12/10
3/4 report, in which each report adjustment comprises a corresponding list of first values that represent time deviations to transmit a CSI report, forming a plurality of lists of first values;
receive (S1720), from the base station (1910), downlink control information (DCI) that triggers the CSI report, in which the DCI comprises an index value related to a time in which to transmit the CSI report on a channel shared physical uplink (PUSCH);
determining (S1730), based on the DCI, a plurality of list entries determining, for each list in the plurality of first value lists, a corresponding list entry that is indexed in the list based on the index value;
determining (S1730) a second value that is greater among the plurality of list entries; and transmit (S1740), to the base station (1910), the CSI report on the PUSCH based on the second value.
[8]
8. EU (1920) according to claim 7, CHARACTERIZED by the fact that the CSI report comprises an aperiodic CSI report.
[9]
9. EU (1920) according to claim 7, CHARACTERIZED by the fact that receiving the DCI (S1720) comprises receiving the DCI in a partition where transmitting the CSI report (S1740) comprises transmitting the CSI report in a n + partition (second value).
[10]
10. UE (1920) according to claim 7, CHARACTERIZED by the fact that the index value is represented by 2 bits and in which the index value is represented by one of 00, 01, 10 or 11.
[11]
11. EU (1920) according to claim 10, CHARACTERIZED by the fact that:
the index value of 00 corresponds to a first entry in each of the plurality of first value lists,
Petition 870190140652, of 12/27/2019, p. 12/11
4/4 the index value of 01 corresponds to a second entry in each of the plurality of lists of first values, the index value of 10 corresponds to a third entry in each of the plurality of lists of first values, and the value index 11 corresponds to a fourth entry in each of the plurality of first value lists.
[12]
12. EU (1920) according to claim 7, CHARACTERIZED by the fact that the index value is greater than or equal to zero and in which each list entry is indexed in the corresponding list of the first values in a position corresponding to 1 + (index value) in the list.

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CA3030518A1|2019-05-28|

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EP3552333B1|2021-02-17|

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AU2018282267A1|2019-06-13|

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JP2020503710A|2020-01-30|

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EP3552333A1|2019-10-16|

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JP6730521B2|2020-07-29|

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CL2019000370A1|2019-09-23|

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MX2019000579A|2019-10-30|

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BR112019008357A2|2019-07-09|

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法律状态:
2019-09-17| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 1/06 , H04L 5/00 , H04L 25/02 Ipc: H04L 5/00 (1968.09), H04B 7/06 (1968.09), H04W 72/ |

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2019-10-01| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2020-01-14| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-03-24| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 27/11/2018, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US201762591727P| true| 2017-11-28|2017-11-28|

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US62/591,727|2017-11-28|

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KR10-2018-0045456|2018-04-19|

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KR20180045456|2018-04-19|

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PCT/KR2018/014708|WO2019107873A1|2017-11-28|2018-11-27|Method for reporting channel state information in wireless communication system and apparatus for the same|

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