WO2014148862A1 - 무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 - Google Patents
무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 Download PDFInfo
- Publication number
- WO2014148862A1 WO2014148862A1 PCT/KR2014/002403 KR2014002403W WO2014148862A1 WO 2014148862 A1 WO2014148862 A1 WO 2014148862A1 KR 2014002403 W KR2014002403 W KR 2014002403W WO 2014148862 A1 WO2014148862 A1 WO 2014148862A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- precoding matrix
- follows
- codebook
- constructed
- precoding
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2778—Interleaver using block-wise interleaving, e.g. the interleaving matrix is sub-divided into sub-matrices and the permutation is performed in blocks of sub-matrices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0645—Variable feedback
- H04B7/065—Variable contents, e.g. long-term or short-short
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0658—Feedback reduction
- H04B7/0663—Feedback reduction using vector or matrix manipulations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for transmitting channel state information using subsampling of a codebook in a wireless communication system, and an apparatus for this.
- LTE 3rd Generation Partnership Project Long Term Evolution
- E-UMTS Evolved Universal Mobile Telecommunications
- UMTS Universal Mobile Telecommunications
- LTE Long Term Evolution
- UMTS and E—Details of the technical specifications of the UMTS can be found in the "3rd Generation Partnership Project; Technical Specification Group Radio Access Network" - ⁇ ] Release 7 and Release 8, respectively.
- an E-UMTS is located at an end of a user equipment (UE) and a base station (eNodeB, eNB, network (E-UTRAN)) and connected to an external network (Access Gateway, AG).
- UE user equipment
- eNodeB eNodeB
- E-UTRAN network
- a base station can transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
- the cell is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz to provide downlink or uplink transmission services to multiple terminals. Different cells may be configured to provide different bandwidths.
- the base station controls data transmission and reception for a plurality of terminals.
- For downlink (DL) data the base station transmits downlink scheduling information to inform the corresponding UE of time / frequency domain, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information.
- HARQ Hybrid Automatic Repeat and reQuest
- the base station The scheduling information is transmitted to the terminal to inform the user of the time / frequency region, encoding, data size, HARQ related information, etc. available to the terminal.
- the core network may be composed of a network node for the user registration of the AG and the terminal.
- the AG manages the mobility of the UE in units of a TACTracking Area consisting of a plurality of cells.
- Wireless communication technology has been developed to LTE based on WCDMA, but the demands and expectations of users and businesses are continuously increasing.
- new technological evolution is required to be competitive in the future. Cost per bit is reduced, service availability is increased, the use of flexible frequency bands, simple structure and open interface, and proper power consumption of the terminal are required.
- the MIMO (Multiple-Input Multiple-Output) technology can improve the transmit / receive data efficiency by adopting multiple transmit antennas and multiple receive antennas, which is far from using one transmit antenna and one receive antenna.
- the transmitting end (black) of a wireless communication system is a technique for increasing capacity or improving performance by using multiple antennas at a receiving end.
- the MIM0 technique may be referred to as a multi-antenna technique.
- a precoding matrix that appropriately distributes transmission information to each antenna according to channel conditions may be applied.
- a method of transmitting channel state information (CSI) by a terminal in a wireless communication system includes 16 precoding matrices. Subsampling a codebook for an included four antenna port; And feeding back a CSI based on the subsampled codebook, and when the RKRank indicator is 4, the subsampled codebook is a first precoding matrix having an index 0 among the 16 precoding matrices. A third precoding matrix having 2, a ninth precoding matrix having an index 8, and an eleventh precoding matrix having an index 10 may be included.
- a terminal for transmitting channel state information includes: a radio frequency (RF) unit; And a processor, wherein the processor is configured to subsample a codebook for a 4 antenna port including 16 precoding matrices, and to feed back CSI based on the subsampled codebook, and RI (Rank) indicator) is 4, the subsampled codebook includes a first precoding matrix having an index of 0, a third precoding matrix having an index of 2, a ninth precoding matrix having an index of 8, and the like; It may include an eleventh precoding matrix having an index of 10.
- the first precoding matrix is configured as follows.
- the third precoding matrix is configured as follows.
- the ninth precoding matrix is configured as follows.
- the eleventh precoding matrix may be configured as follows.
- the IPMI may indicate an index of a precoding matrix having one of 0 to 3 values.
- the subsampling step may subsample a precoding matrix including only real values among the 16 precoding matrices.
- the 16 precoding matrices may be subjected to subsampling for a precoding matrix based on the Binary Phase Shift Keying (BPSK) modulation method.
- BPSK Binary Phase Shift Keying
- the subsampling may be performed on a precoding matrix having a value that corresponds to an X-pol (cross polarization) antenna among the 16 precoding matrices.
- the second precoding matrix of the 16 precoding matrices is configured as follows.
- the fourth precoding matrix is constructed as follows.
- the fifth precoding matrix is constructed as follows.
- the precoding matrix is constructed as follows.
- the seventh precoding matrix is constructed as follows :
- the precoding matrix is constructed as follows.
- the tenth precoding matrix is constructed as follows.
- the twelfth precoding matrix is constructed as follows :
- the thirteenth precoding matrix is configured as follows. [45]
- the fourteenth precoding matrix is configured as follows.
- the fifteenth precoding matrix is constructed as follows.
- the sixteenth precoding matrix may be configured as follows.
- a method and apparatus for efficiently transmitting channel state information using subsampling of a codebook in a wireless communication system may be provided.
- FIG. 1 schematically illustrates an E—UMTS network structure as an example of a wireless communication system.
- FIG. 2 illustrates a structure of a control plane and a user plane of a radio interface protocol between a UE and an EHJT AN based on the 3GPP radio access network standard.
- 3 illustrates physical channels used in a 3GPP system and a general signal transmission method using the same.
- FIG. 4 illustrates a structure of a radio frame used in an LTE system.
- FIG. 5 illustrates a structure of a downlink radio frame used in an LTE system.
- FIG. 6 illustrates a structure of an uplink subframe used in an LTE system.
- FIG. 7 illustrates a configuration of a general multiple antenna (MIM0) communication system.
- FIG. 14 illustrates a process of periodically reporting channel state information when using a hierarchical codebook.
- 15 is a flowchart illustrating a method of transmitting channel state information according to the present invention.
- the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, this, as an example, may be applied to any communication system corresponding to the above definition.
- the present specification describes an embodiment of the present invention on the basis of the FDD method, which is an example of the present invention can be easily modified and applied to the H-FDD method or the TDD method.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a user equipment and an E—UTRAN based on the 3GPP radio access network standard.
- the control plane is a terminal (User Equipment , A path through which control messages used by the UE and the network to manage a call are transmitted.
- the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
- the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
- the physical layer is connected to the upper layer of the medium access control layer through a transport channel. Data moves between the medium access control layer and the physical layer through the transport channel. Data moves between the physical layer of the transmitting side and the receiving side through the physical channel.
- the physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in the Orthogonal Frequency Division Multiple Access (0FDMA) scheme in the downlink, and modulated in the SC-FDM Single Carrier Frequency Division Multiple Access (SCDM) scheme in the uplink.
- OFDMA Orthogonal Frequency Division Multiple Access
- SCDM Single Carrier Frequency Division Multiple Access
- Radio Link Control (RLC) layer which is a higher layer, through a logical channel.
- RLC Radio Link Control
- the RLC layer of the second layer supports reliable data transmission.
- the function of the RLC layer may be implemented as a functional block inside the MAC.
- the Packet Data Convergence Protocol (PDCP) layer of the second layer provides unnecessary control for efficiently transmitting IP packets such as IPv4 or IPv6 over a narrow bandwidth air interface. Perform header compression to reduce information.
- PDCP Packet Data Convergence Protocol
- the radio resource control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
- the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configurat ion, and release of radio bearers (RBs).
- RB means a service provided by the second layer for data transmission between the terminal and the network.
- the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connection (RRC Connected) between the UE and the RRC layer of the network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode.
- the non-access stratum (NAS) layer above the RRC layer provides session management.
- One cell constituting an eNB is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20Mhz to provide downlink or uplink transmission service to various terminals. Different cells may be configured to provide different bandwidths.
- a downlink transport channel for transmitting data from a network to a terminal includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting user traffic or a control message. ). Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
- the uplink transmission channel for transmitting data from the UE to the network includes a random access channel (RAC) for transmitting an initial control message, and an uplink shared channel (SCH) for transmitting user traffic or a control message. It is located above the transport channel, and BCCH (Broadcast Control) is a logical channel mapped to the transport channel.
- PCCH Paging Control Channel
- CCCH Common Control Channel
- MCCH Multicast Control Channel
- MTCH Modult icast Traffic Channel
- FIG. 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same. '
- the UE performs an initial cell search operation such as synchronizing with a base station when a power is turned on or a new cell is entered.
- the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S—SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID. have.
- the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell.
- the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- DL RS downlink reference signal
- the UE which has completed initial cell discovery receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information carried on the PDCCH.
- Information can be obtained (S302).
- the terminal may perform a random access procedure (RACH) for the base station (Step S303 to step S306).
- RACH random access procedure
- the UE may transmit a specific sequence to the preamble through a physical random access channel (PRACH) (S303 and S305), and may receive a voice response message for the preamble through the PDCCH and the corresponding PDSCH ( S304 and S306).
- PRACH physical random access channel
- a contention resolution procedure may be additionally performed.
- the UE After performing the above-described procedure, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel as a general uplink / downlink signal transmission procedure. (Physical Uplink Control Channel, PUCCH) can be performed (S308).
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI downlink control information
- the DCI includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.
- the terminal transmits to the base station through the uplink or the terminal
- Control information received from the base station is a downlink / uplink ACK / NACK signal
- the UE can transmit the above-described control information such as CQI / PMI / RI through PUSCH and / or PUCCH. have.
- FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
- a radio frame has a length of 10 ms (327200 x Ts) and 10 equals. It consists of subframes of size. Each subframe has a length of 1 ms and consists of two slots. Each slot has a length of 0.5 ms (15360 XTs).
- the slot includes a plurality of (FDM symbols) in the time domain and a plurality of 'Resource Blocks (RBs) in the frequency domain.
- FDM symbols FDM symbols
- RBs 'Resource Blocks
- one resource block includes 12 subcarriers X7 (6) 0FDM symbols.
- the transmission time interval ( ⁇ ) which is a unit time in which data is transmitted, may be determined in units of one or more subframes.
- the above-described structure of a radio frame is merely an example, and the number of subframes included in the radio frame is included. Alternatively, the number of slots included in the subframe and the number of 0FOM symbols included in the slots may be variously changed.
- FIG. 5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
- a subframe consists of 14 OFDM symbols.
- R1 to R4 represent reference signals (RS) or pilot signals for antennas 0 to 3.
- the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
- the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
- Control channels allocated to the control region include PCFICH (Physical Control Format Indicator ' CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Downlink Control CHannel).
- the PCFICH is a physical control format indicator channel and informs the UE of the number of 0FDM symbols used for the PDCCH in every subframe.
- the PCFICH is located in the first 0FDM symbol and is set in preference to the PHICH and PDCCH.
- One REG consists of four REXResource Elements.
- RE represents a minimum physical resource defined by one subcarrier and one 0FOM symbol.
- the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).
- QPSK Quadrature Phase Shift Keying
- the PHICH is a physical HARQ indicator channel and is used to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL AC / NACK information for UL HARQ is transmitted.
- the PHICH consists of one REG and is cell-specifically scrambled.
- ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
- BPSK binary phase shift keying
- the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe.
- n is indicated by the PCFICH as an integer of 1 or more.
- the PDCCH consists of one or more CCEs.
- PDCCH is a paging channel (PCH) that is a transport channel and
- Paging channel (PCH) and down 1 ink-shared channel (DL-SCH) are transmitted through PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
- Data of the PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode PDSCH data is included in the PDCCH and transmitted. For example, if a particular PDCCH is called " ⁇ "
- Radio Network Temporary Identity RNTI
- radio resource eg, frequency location
- DCI format DCI format
- transmission format information eg, transmission block size, modulation scheme, It is assumed that information on data transmitted using coding information, etc.
- the terminal in the cell monitors the PDCCH using the RNTI information it has, and if there is at least one terminal having an "A" RNTI, the terminals receive the PDCCH, and through the information of the received PDCCH " Receive PDSCH indicated by [beta] '' and.
- FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- an uplink subframe carries control information.
- a physical uplink shared channel (PUCCH) is allocated, and a physical uplink shared channel (PUSCH) carrying user data is allocated.
- the part is assigned to the PUCCH. Control information transmitted on the PUCCH is used for HARQ
- the PUCCH for one UE uses one resource block occupying a different frequency in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are slots Frequency hopping at the boundary.
- Multiple-out put is a method of using a plurality of transmission antennas and a plurality of reception antennas, which can improve data transmission and reception efficiency. That is, by using a plurality of antennas at the transmitting end or the receiving end of the wireless communication system, it is possible to increase capacity and improve performance.
- MIM0 may be referred to as a 'multi-antenna'.
- multi-antenna technique it does not rely on a single antenna path to receive one entire message. Instead, in multi-antenna technology, data fragments received from multiple antennas are gathered and merged to complete the data. Using multi-antenna technology, it is possible to improve the data transmission rate within a cell area of a specified size or to increase system coverage while guaranteeing a specific data transmission rate. In addition, this technique can be widely used in mobile communication terminals and repeaters. According to the multiple antenna technology, it is possible to overcome the transmission limit in the mobile communication according to the prior art, which used a single antenna.
- FIG. NT transmitting antennas are provided at the transmitting end, and NR receiving antennas are provided at the receiving end.
- the increase in channel transmission capacity is proportional to the number of antennas. Therefore, the transmission rate is improved and the frequency efficiency is improved.
- the maximum transmission rate when using one antenna is Ro
- the transmission rate when using multiple antennas is theoretically the maximum transmission rate as shown in Equation 1 below. It is possible to increase Ro by multiplying the rate of increase rate Ri. Where Ri is the smaller of NT and NR.
- the transmission information may be represented by a vector shown in Equation 2 below.
- each transmission information transmission power can be different, wherein each transmission If
- the transmission power adjusted power is represented by a vector as shown in Equation 3 below.
- NT transmit signals that are actually transmitted by applying an augmentation matrix W to the information vector S whose transmission power is adjusted.
- the weight matrix plays a role of properly distributing transmission information to each antenna according to a transmission channel situation.
- Such a transmission signal
- the physical meaning of the tank of the channel matrix is the maximum number that can transmit different information in a given channel. So the channel matrix
- rank (H) of the channel matrix H is limited as in Equation 6.
- each of the different information sent using the multi-antenna technology will be defined as a 'stream' or simply 'stream'.
- a 'stream' may be referred to as a 'layer'.
- the number of transport streams can then, of course, not be larger than the tank of the channel, which is the maximum number of different information that can be sent. Accordingly, the three-channel matrix H can be expressed by Equation 7 below.
- # of streams represents the number of streams, while it should be noted that one stream may be transmitted through more than one antenna.
- channel state information (CSI) reporting will be described.
- CSI channel state information
- an open-loop MIMO operated without channel state information and a closed-loop MIMO operated based on channel state information.
- closed-loop MIM0 multiplexing of MIM0 antennas
- each of the base station and the terminal may perform beamforming based on channel state information.
- the base station allocates a PUCCHCPhysical Upl Ink Control CHannel (PUC) or a Physical Uplink Shared CHannel (PUSCH) to the terminal to feed back channel state information (CSI) for the downlink signal.
- PUC Physical Upl Ink Control CHannel
- PUSCH Physical Uplink Shared CHannel
- CSI is classified into three types of information: RKRank Indicator, PMKPrecoding Matrix Index, and CQ I (Channel Quality Indication).
- the RI represents the rank information of the channel as described above, and means the number of streams that the UE can receive through the dynamic frequency time resource.
- the RI is fed back to the base station at a longer period than the PMI and CQI values.
- PMI is a value that reflects the spatial characteristics of a channel.
- CQI is a value indicating the strength of the channel means a reception SINR that can be obtained when the base station uses the PMI.
- MU-MIM0 ⁇ It i-user MIM0
- MU-MIM0 Since there is interference between terminals multiplexed in the antenna domain in MIM0, the accuracy of CSI may have a great influence on the interference of not only the UE reporting the CSI but also other multiplexing terminals. Therefore, MU-MIM0 requires more accurate CSI reporting than SU-MIM0.
- the final PMI is defined as W1, which is a long term and / or wideband (WB) PMI, and a short term and / or subband (SB, PB), which is a PMI. It was decided to design by dividing by W2.
- a long term covariance matrix of a channel may be used as shown in Equation 8 below.
- W ⁇ W1W2)
- W2 is a short term ⁇ , which is a codeword of a codebook configured to reflect short-term channel state information
- W is a codeword (in other words, a precoding matrix) of a final codebook
- o is a matrix. norm of each column (norm) of the first to -'4
- Equation 9 The specific structure of the existing W1 and W2 is shown in Equation 9 below.
- NT denotes the number of transmit antennas
- M denotes the number of columns of the matrix Xi
- eMk, eMl, and eMm are thermal vectors whose kth, 1st, and mth elements are 1, and the remainder are 0, respectively, of M elements, and kth of Xi,
- the first and mth column vectors are shown. J , ⁇ J and are all unit norm (unit
- a complex value with norm indicating that phase rotation is applied to the column vectors when the k, 1, and m column vectors of the matrix Xi are selected, respectively. i is greater than or equal to zero
- Equation 9 the structure of the codeword is cross polarized antenna
- the spacing between antennas is dense, for example, when the distance between adjacent antennas is usually less than half of the signal wavelength, the correlation of the generated channel
- the antennas can be divided into horizontal antenna groups and vertical antenna groups. Each antenna group has characteristics of a uniform linear array (ULA) antenna. Co-located.
- ULA uniform linear array
- the correlation between antennas of each group has the same linear phase increase (LPI) characteristic, and the correlation between antenna groups has a phase rotated characteristic.
- LPI linear phase increase
- the codebook is a quantized value of the channel, so the characteristics of the channel remain the same. It is necessary to design the codebook to reflect.
- the rank 1 codeword having the above-described structure may be illustrated as Equation 10 below.
- the codeword is represented by ⁇ J 1 vector, and is structured as an upper vector z and a lower vector J ⁇ , and each shows correlation characteristics between a horizontal antenna group and a vertical antenna group.
- a discrete fourier transform (DFT) matrix may be used.
- channel state information includes, but is not limited to, CQI, PMI, RI, and the like, and all of CQI, PMI, RI are transmitted according to the transmission mode of each UE. Only some of them are sent.
- the case where the channel state information is transmitted periodically is called periodic reporting, and the case where the channel state information is transmitted by the request of the base station is called aperiodic reporting.
- aperiodic reporting a request bit included in uplink scheduling information provided by the base station is transmitted to the terminal. Thereafter, the terminal transmits channel state information considering its transmission mode to the base station through an uplink data channel (PUSCH).
- PUSCH uplink data channel
- a period and an offset in a corresponding period are signaled in subframe units in a semi-static manner through a higher layer signal for each terminal.
- Each terminal delivers channel state information considering a transmission mode to a base station through an uplink control channel (PUCCH) at predetermined intervals. If uplink data exists simultaneously in a subframe that transmits channel state information, the channel state information is transmitted through the uplink data channel (PUSCH) together with the data.
- the base station considers the channel status of each terminal and the distribution status of the terminals in the cell, etc.
- the timing information is transmitted to the terminal.
- the transmission timing information includes a period for transmitting channel state information, an offset, and the like, and may be transmitted to each terminal through an RC message.
- the CQI reporting mode is divided into CQI and SB CQI according to the CQI feedback type, and divided into a PMI member (No PMI) and a single PMI according to whether PMI is transmitted.
- Each UE receives information consisting of a combination of a period and an offset to periodically report the CQI through RRC signaling.
- FIG. 9 illustrates an example of transmitting channel state information when the terminal receives information indicating ⁇ period '5' and offset '1' ⁇ .
- the UE sets five subframes with an offset of one subframe in the increasing direction of the subframe index from the 0th subframe.
- Channel state information is transmitted in subframe units.
- Channel status information is basically
- the subframe index is a combination of a system frame number (or radio frame index) (nf) and a slot index (ns, 0 to 19).
- the subframe consists of two slots, so the subframe index is
- the type of transmitting only WB CQI transmits CQI information for the entire band in a subframe corresponding to every CQI transmission period.
- the PMI also needs to be transmitted according to the PMI feedback type as shown in FIG. 8, the PMI information is transmitted together with the CQI information.
- the WB CQI and SB CQI are transmitted alternately.
- the system band consists of 16 RBs.
- the system band consists of two bandwidth parts (BP), each BP consists of two subbands (SB0, SB1), and each SB consists of four RBs.
- BP bandwidth parts
- SB0, SB1 subbands
- each SB consists of four RBs.
- the number of BPs and the size of each SB may vary according to the size of a system band.
- the number of SBs constituting each BP may vary according to the number of RBs, the number of BPs, and the size of the SBs.
- the WB CQI is transmitted in the first CQI transmission subframe, and belongs to BP0 in the next CQI transmission subframe.
- the CQI for the SB having a good channel state among the SB0 and the SB1 and the index of the SB (for example, Subband Selection Indicator, SSI) are transmitted. After that, the next CQI transmission subframe
- the CQI for the SB having a good channel state and the index of the SB are transmitted.
- the CQI information for each BP is sequentially transmitted.
- CQI information for each BP may be sequentially transmitted 1 to 4 times between two WB CQIs.
- the CQI information for each BP may be transmitted in the order of WB CQI ⁇ BPO CQI ⁇ BPl CQI ⁇ WB CQI.
- WBCQI ⁇ BPO CQI ⁇ BPl CQI ⁇ BPO CQI ⁇ BPl CQI ⁇ BPO CQI ⁇ BPl CQI ⁇ BPO CQI ⁇ BPl CQI ⁇ WB CQI Can be sent to.
- Information on how many times each BP CQI will be sequentially transmitted is signaled in a higher layer (eg, RRC layer).
- FIG. 11 (a) shows an example in which both the WB CQI and the SB CQI are transmitted when the UE is signaled with information indicating ⁇ period '5' and offset '1' ⁇ .
- the CQI may be transmitted only in a subframe corresponding to the signaled period and offset regardless of the type.
- FIG. 1Kb) illustrates a case in which an RI is additionally transmitted in the case of FIG. 11 (a).
- the RI may be signaled from a higher layer (eg, R C layer) in a combination of how many times the WB CQI transmission period is transmitted and the offset in the transmission period.
- the offset of the RI is signaled as a value relative to the offset of the CQI.
- FIG. 11B is a diagram
- the transmission period of RI is 1 times the WB CQI transmission period and the offset of RI is equal to 11 (a). Since the transmission period of the RI is 1 times the transmission period of the WB CQI, the transmission period of the channel state information is substantially the same. Since RI is an offset, RI is transmitted based on '-1' (that is, subframe 0) for offset '1' of CQI in FIG. 11 (a). If the offset of the RI is '0', the WB CQI and the transmission subframes of the RI overlap. In this case, the WB CQI is dropped and the RI is transmitted.
- CSI feedback in the case of Mode 1-1 of FIG. 8.
- CSI feedback consists of transmission of two types of report content, Report 1 and Report 2. Specifically, RI is reported in Report 1, and WBPMI and WB CQI are transmitted in Report 2.
- Report 2 is transmitted at a subframe index that satisfies (lOnf + f loor (ns / 2) -N offset, CQI) mod (Npd).
- Npd represents a subframe interval between adjacent Report 2
- MRI is determined by higher layer signaling.
- FIG. 13 illustrates CSI feedback in the case of Mode 2-1 of FIG. 8.
- CSI feedback is composed of transmission of three types of report contents, Report 1, Report 2, and Report 3. Specifically, Report 1 selects RI, Report 2 selects WB PMI and WB CQI, and Report 3 selects SB (subband) CQI and L1-bit subbands.
- An indicator (Stibband Selection Indicator, SSI) is transmitted.
- Report 2 is transmitted at every H * Npd interval, and subframes between adjacent Report 2 are filled with Report 3 transmission.
- I a value indicating the number of consecutive cycles of performing a full cycle of selecting and transmitting a subband once for each BP over all BPs, and is determined by higher layer signaling.
- FIG. 14 illustrates periodic reporting of channel state information under discussion in LTE—A system.
- the base station has eight transmit antennas, in the case of Mode 2-1, it sets the PTKPrecoder Type Indication parameter, which is a 1-bit indicator, and according to the PTI value.
- PTKPrecoder Type Indication parameter which is a 1-bit indicator
- PTI value a 1-bit indicator
- W1 and W2 represent hierarchical codebooks described with reference to Equations 8-9. Both W1 and W2 must be determined to combine them to determine the complete precoding matrix W.
- Report 1 reports RI and 1-bit PTI values.
- nf is the system frame number
- ns represents a slot index in a radio frame.
- ⁇ represents the rounding function
- a mod B represents the remainder of A divided by B.
- MRI is determined by higher layer signaling.
- N offset, RI represents a relative offset value for RI
- the transmission time of Report 1 and Report 2 does not overlap each other.
- the terminal calculates RI, Wl, W2 values, These are calculated in relation to each other. For example, W1 and are calculated depending on the RI value, and W2 is calculated depending on W1.
- the base station can know the final W from W1 and W2.
- the PMI of the 8Tx codebook is used for long term and / or wideband precoder and short term and / or narrowing in order to improve the feedback channel accuracy. It is preferable to divide the design into two subbands, W (2) .
- W is a precoder generated from W and w (2 ), and the UE feeds back this information to the base station.
- orm (A) means a matrix in which norm of each column ( co l umn ) of the matrix A is normalized to 1.
- the codeword structure uses a cross polarized antenna and has a correlation between channels that occurs when the distance between antennas is dense (generally, when the distance between adjacent antennas is less than or equal to half the signal wavelength). This structure is designed to reflect the correlation characteristics.
- the antenna may be divided into a horizontal antenna group and a vertical antenna group. Each antenna group has the characteristics of a ULA unifonn linear array antenna, and the two antenna groups are co-located. Therefore, the correlation between antennas of each group is the same linear phase increase (LPI, LPI).
- the correlation between the antenna groups has a phase rotated characteristic.
- the codebook is a quantized value of the channel, it is necessary to design the codebook by reflecting the characteristics of the channel corresponding to the source. For example, a rank 1 codeword that satisfies the following equation reflects the channel characteristics described above.
- a codeword is represented by a vector of Nt (number of Tx antennas) ⁇ 1 and structured into an upper vector X 'and a lower vector "' ⁇ '( ' upper vector and lower vector.
- Nt number of Tx antennas
- X reflects the correlation characteristics between the antennas of each antenna group
- LPI linear phase increase
- ⁇ ' ⁇ a DFT matrix may be used.
- An 8 Tx codebook for a base station with 8 Tx antennas is defined in the LTE Re 1-10 system.
- the codebook is a dual codebook structure in which two codebooks are multiplied.
- An inner precoder w (1) is a first codebook as shown in the following equation.
- the outer precoder W (2) for rank 1 transmission is selected from the second codebook C i (2) as shown below.
- Outer precoder for rank 2 transmission It is selected from the second codebook C) as shown in the equation.
- phase value determined by the codeword index of and ⁇ ' .
- the rank 1 codeword of the 4 Tx codebook is generated as follows.
- the 2x2 DFT matrix is oversampled eight times to generate a 2x16 DFT matrix.
- V is concatenated repeatedly to generate a 4x1 vector of [v ⁇ ] ⁇ .
- the channel characteristics of the ULA antenna can be expressed by the characteristics of the dominant eigen vector of the channel.
- the dominant el gen vector In a correlated environment where the spacing between ULA antenna ports is tight, the dominant el gen vector generally has LPI characteristics. Since each transmit antenna port is spaced at equal intervals, the signal leaving each port has a regular receive delay. That is, the signal received from the first transmit antenna There is a difference in the reception time by ⁇ " between the signals received from the i th transmit antenna. The difference in the reception time is eventually represented by the phase change of the channel, so that the signal received from the first transmit antenna and the signal received from the first transmit antenna is different. "it exists a phase difference of as much as, and the channel represents the LPI properties. Therefore, in a codebook optimized in a correlated environment where the spacing between ULA antenna ports is tight, each codeword must have an LPI attribute.
- the 4Tx codebook described above is composed of a first codebook L having a 3-bit size and a second codebook L having a 4-bit size in each tank, and have a total size of 7 bits. Depending on the tank, it is defined by dividing it by C i (2) and
- the second codebook is assumed to be L without rank division). Some of the rank 1 codewords generated by the codebook have LPI characteristics in consideration of ULA antennas. However, among the rank 2 codewords generated by the codebook, no codeword having LPI characteristics exists in both the first and second columns.
- the 4 Tx codebook of rank 2 may consist of only codewords having the above characteristics, or may be configured to include codewords having the above characteristics.
- n and m represent indices of any DFT vector selected through
- Wn and Wni are each over sampled.
- Equation 18 is arranged as in Equation below.
- the inner precoder W () is selected from [] ⁇ codebook ⁇ .
- k is the codeword index of.
- (k) represents the k-th codeword of the codebook.
- the outer precoder w (2) for rank 2 transmission is selected from the second codebook C of the following equation.
- e '' denotes a 4-element selection vector having all zero except for the nth component.
- 1 is Is a codeword index of 0,1,2,7.
- 2) (is C ? First in the codebook
- L according to the first example of the 4 Tx codebook of Tank 2 is generated by using an oversampled DFT vector equal to L of Equation 15.
- the following is composed of eight consecutive oversampled DFT vectors. This is so that the two beam vectors constituting the Tank 2 codeword have LPI properties. Is equal to four consecutive, oversampled DFT vectors.
- the two generated beam vectors may have LPI properties.
- L and P according to the first example of the 4 Tx codebook of Tank 2 may be used to generate a codeword having an LPI attribute.
- ( Y >' Y2 ) in C (2 ) is limited to ( e '' e ' + 4 ).
- ni-nl 4 is always satisfied in (21).
- all beam vectors constituting Rank 2 are orthogonal and LPI. Based on 21, in the first example of Rank 2's 4 Tx codebook
- the inner precoder w () is selected from the first codebook ⁇ ' .
- An outer precoder for tank 2 transmission is selected from the second codebook ⁇ 2) of the following equation.
- e represents a zero, and both 4 ⁇ component (element) selected vector (vector select ion) having a (zero) except for the n-th components.
- 1 Codeword of Index and I 0,1,2,3.
- . . C 2 2> (I) is the first codeword of the C) codebook
- L according to the second example of the 4 Tx codebook of rank 2 is composed of a matrix having the same size as L of Equation 15. [221] However, unlike Equation 15, the second example of the 4 Tx codebook of rank 2
- the result is composed of DFT vectors oversampled four times rather than eight times. This means that the two beam vectors that make up the rank 2 codeword are LPI properties.
- Equation 15 is composed of DFT vectors oversampled eight times, even if C is used to select any vector existing in L , the two beam vectors generated in the end do not have LPI properties. can not do it.
- the fourth Tx codebook of rank 2 is composed of a 4-fold oversampled (oversamp l e) DFT vectors, through the two pan-vector (beam vector) may have a LPI properties .
- the two beam vectors selected through must satisfy
- 4 in order to have LPI attributes.
- the second example of Tank 2's 4 Tx codebook consists of an 8x oversampled DFT vector. Since according to the second example of the rank 2 4Tx codebook consists of four times oversampled DFT vectors, it should satisfy
- 4. In order to satisfy this condition, it is set to ( e ⁇ 2) e ei ' e3 M e2 ' e in Equation 25.
- the codebook according to the third example of the 4 Tx codebook of rank 2 is nationalized as in the following equation.
- An inner precoder w () is selected from the first codebook ⁇ ' .
- (k) represents the kth codeword of the L codebook.
- An outer precoder w for rank 2 transmission is selected from the second codebook C of the following equation.
- Da ( Z ) is composed of P-th row and? -Th column as shown in the following equation, where / and q start at 0.
- W w may be set as in the following equation.
- W « may be set as in the following equation.
- w may be set as in the following equation.
- W may be set as in the following equation.
- W may be set as in the following equation.
- the number of bits of the pre-coder (inner precoder) and outside the precoder (ou ter precoder) W () will be described for each of the 4-bit and 2-bit is set.
- Da ( ⁇ ) consists of a P-th row and a ninth column, as shown in the following equation, where P and? Start at zero.
- W may be set as in the following equation.
- the codebook may be sampled to generate a form that reduces the codebook size.
- system performance is generally less sensitive to codebook size than low rank.
- the max rank may be
- the LTE 8 Tx codebook is designed to have a clear enjoyment of the codebook size in high tanks, and the codebook size is 0 bits in tank 8.
- the LTE release -84 Tx codebook is sampled below.
- the new codebook according to the present invention generated by the following will be described. According to the present invention, the feedback overhead can be saved by reducing the codebook size.
- the LTE release -84 Tx codebook is achieved by selecting the rank n column vectors in each matrix of the following equation in a predetermined manner.
- the 4 Tx codebook is as follows.
- each matrix for the BPSK modulation method in the 4 TX codebooks of Tank 4 is represented by the following equation.
- each matrix for the QPSK modulation method in the 4 ⁇ codebook of rank 4 is represented by the following equation.
- Equation 41 the sign of the imaginary part may be changed as in the following Equation.
- Equation 43 the sign of the imaginary part may be changed as in the following Equation.
- the 4 TX codebook is as follows.
- each matrix of the BPSK modulation method in the 4 TX codebook of Tank 3 is expressed by the following equation.
- each matrix for the 4 ⁇ codebook enhancement QPSK modulation method of rank 3 is expressed by the following equation.
- each matrix for the 8PSK modulation method in the 4 TX codebooks of Tank 3 is represented by the following equation.
- a value (alphabet) constituting each codeword is considered.
- the matrix for the BPSK modulation method has only real values, but the QPSK or 8PSK matrix also has imaginary values. Since the imaginary values increase the amount of computation when the terminal is implemented, it is advantageous to design a codebook consisting only of the values of the BPSK matrix.
- the second principle of sampling codebooks is to consider channel characteristics in high tanks. Since the X-I and ULA antennas have different channel characteristics, it is optimal to use different codebooks that are specific to each antenna setup. However, as described above, since a codebook does not significantly affect performance in a high tank, using a single codebook is complicated in terms of complexity.
- each channel of the horizontal antenna and the vertical antenna has the same value, and there is a phase difference between the two antennas. Therefore, it is desirable to select a codebook that maintains this structure in the Release-8 codebook.
- the following codebook for rank 3 or 4 consisting of 1 bit, 2 bits and 3 bits according to the present invention is proposed.
- the codebook for rank 3 or 4 of 1 bit according to the present invention may be configured as follows.
- the 1-bit codebook may consist of only WO and W2 in Equation 18 in Equation 40.
- the column vector permutat ion and column vector selection for each rank can be applied to the release-8 method.
- the 1-bit codebook according to the present invention consists of BPSK values according to the first principle, is commonly applied to all antenna configurations according to the second principle, and satisfies the channel structure of X-pol according to the third principle.
- a 2-bit code 3 or 4 codebook may be configured as follows.
- the 2-bit codebook according to the present invention may consist of only WO, W2, W8, and W10 in the above-described rank 3 and 4 codebooks.
- codebook indices of 0, 2, 8, and 10 may be derived by applying a second PMI index 1 ⁇ 12 having one of 0 to 3 to the following equation.
- the thermal vector replacement and the thermal vector selection for each rank may be applied to the release-8 ' method as it is.
- the 2-bit codebook according to the present invention is composed of BPSK values according to the first principle, is commonly applied to all antenna configurations according to the second principle, and satisfies the channel structure of X-poI according to the third principle.
- the 3-bit codebook for tank 3 or 4 according to the present invention may be configured as follows.
- a 3-bit codebook according to the present invention may be composed of only W2, 8, W10, W12, 13, W14, and W15 in Equation 40. For each rank, thermal vector substitution and thermal vector selection can be applied to the Leeds-8 method.
- the 3-bit codebook according to the present invention consists of BPSK values according to the first principle, and is commonly applied to all antenna configurations according to the second principle. However, W12, 13, W14, and W15 do not meet the third principle because they do not satisfy the X-pol channel structure.
- the codebook is composed of only WO, W2, W8, W10, 1, W3, W9, and W11 in Equations 40 to 42. For each tank, thermal vector replacements and thermal vector selections remain in the Release-8 format. The codebook does not satisfy the first principle. However, the second principle is common to all antenna configurations, and the third principle satisfies the X-pol channel structure.
- the RAM-3 uses the above-described codebook, it may not generate a codebook for rank 4. That is, the rank 4 codebook is fixed with a 4by4 identity matrix.
- step S151 the UE subsamples a codebook for 4 antenna ports including 16 precoding matrices.
- step S153 the UE feeds back CSI based on the subsampled codebook.
- the subsampled codebook includes one precoding matrix having an index of 0, a third precoding matrix having an index of 2, and an index among the 16 precoding matrices described above.
- the above-described matters described in various embodiments of the present invention may be independently applied or two or more embodiments may be applied at the same time, and overlapping content may be used for clarity. The description is omitted for the sake of brevity.
- the MIM0 transmission (in the backhaul uplink and the backhaul downlink) of the base station and the relay period, and the uplink MIM0 transmission and reception for the MIM0 transmission (in the access uplink and the access downlink) between the relay and the terminal can also be applied.
- FIG. 16 illustrates a base station and a terminal that can be applied to an embodiment of the present invention.
- a relay When a relay is included in the wireless communication system, communication is performed between the base station and the relay in the backhaul link, and communication is performed between the relay and the terminal in the access link. Therefore, the base station or the terminal illustrated in the figure may be replaced with a relay according to the situation.
- a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120.
- Base station 110 includes processor 112, memory 114, and radio frequency (Radio).
- the processor 112 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 114 is connected with the processor 112 and stores various information related to the operation of the processor 112.
- the RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal.
- Terminal 120 includes a processor 122, a memory 124, and an RF unit 126.
- the processor 122 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122.
- the RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal.
- the base station 110 and / or the terminal 120 may have a single antenna or multiple antennas.
- the specific operation described in this document to be performed by the base station may be performed by an upper node in some cases. That is, various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station. It is obvious that it can be done.
- a base station may be replaced by terms such as a fixed station, a Node B, an eNodeB (eNB), an access point, and the like.
- An embodiment according to the present invention may be implemented by various means, for example, hardware and firmware.
- an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (FLDs), and FPGAs. (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- FLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2015013412A MX344538B (es) | 2013-03-21 | 2014-03-21 | Metodo y dispositivo para la transmision de informacion de estado de canal en un sistema de comunicacion inalambrica. |
RU2015144890A RU2621010C2 (ru) | 2013-03-21 | 2014-03-21 | Способ и устройство для передачи информации состояния канала в системе беспроводной связи |
JP2016504257A JP6464143B2 (ja) | 2013-03-21 | 2014-03-21 | 無線通信システムにおいてチャネル状態情報送信方法及び装置 |
EP14770655.0A EP2996257B1 (en) | 2013-03-21 | 2014-03-21 | Method and device for transmitting channel state information in wireless communication system |
US14/765,799 US9647738B2 (en) | 2013-03-21 | 2014-03-21 | Method and device for transmitting channel state information in wireless communication system |
KR1020157023835A KR102194926B1 (ko) | 2013-03-21 | 2014-03-21 | 무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 |
CN201480016786.4A CN105075141B (zh) | 2013-03-21 | 2014-03-21 | 在无线通信系统中发送信道状态信息的方法和装置 |
US15/480,140 US20170207842A1 (en) | 2013-03-21 | 2017-04-05 | Method and device for transmitting channel state information in wireless communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201361804173P | 2013-03-21 | 2013-03-21 | |
US61/804,173 | 2013-03-21 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/765,799 A-371-Of-International US9647738B2 (en) | 2013-03-21 | 2014-03-21 | Method and device for transmitting channel state information in wireless communication system |
US15/480,140 Continuation US20170207842A1 (en) | 2013-03-21 | 2017-04-05 | Method and device for transmitting channel state information in wireless communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014148862A1 true WO2014148862A1 (ko) | 2014-09-25 |
Family
ID=51580446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2014/002403 WO2014148862A1 (ko) | 2013-03-21 | 2014-03-21 | 무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 |
Country Status (8)
Country | Link |
---|---|
US (2) | US9647738B2 (ko) |
EP (1) | EP2996257B1 (ko) |
JP (1) | JP6464143B2 (ko) |
KR (1) | KR102194926B1 (ko) |
CN (1) | CN105075141B (ko) |
MX (1) | MX344538B (ko) |
RU (1) | RU2621010C2 (ko) |
WO (1) | WO2014148862A1 (ko) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2830234B1 (en) | 2012-03-19 | 2018-08-01 | Panasonic Intellectual Property Corporation of America | Transmission device, receiving device, transmission method, and receiving method |
CN104348774B (zh) * | 2013-07-31 | 2017-11-28 | 华为技术有限公司 | 接入信道的方法和设备 |
CN106487434B (zh) * | 2015-08-24 | 2020-01-24 | 电信科学技术研究院 | 一种预编码矩阵确定方法及装置 |
US10389426B2 (en) * | 2017-04-25 | 2019-08-20 | Samsung Electronics Co., Ltd. | Method and apparatus for higher rank CSI reporting in advanced wireless communication systems |
CN109150270B (zh) * | 2017-06-28 | 2021-01-05 | 华为技术有限公司 | 信道状态信息反馈和接收方法、发送端设备和接收端设备 |
CN109495972A (zh) * | 2017-09-10 | 2019-03-19 | 株式会社Ntt都科摩 | 发送上行控制信息的方法和移动台 |
US11476901B2 (en) * | 2018-04-27 | 2022-10-18 | Samsung Electronics Co., Ltd. | Method and apparatus to enable CSI reporting based on non-uniform space-frequency compression |
CN110875762A (zh) * | 2018-09-03 | 2020-03-10 | 华为技术有限公司 | 参数配置方法和装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012039588A2 (ko) * | 2010-09-26 | 2012-03-29 | 엘지전자 주식회사 | 다중 안테나 지원 무선 통신 시스템에서 효율적인 피드백 방법 및 장치 |
KR20120117932A (ko) * | 2010-04-05 | 2012-10-24 | 지티이 코포레이션 | 채널 상태 정보의 피드백 방법 및 시스템 |
US20120275542A1 (en) * | 2006-08-22 | 2012-11-01 | Nec Laboratories America, Inc. | Method for Transmitting an Information Sequence |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2892454B1 (fr) * | 2005-10-21 | 2008-01-25 | Snecma Sa | Dispositif de ventilation de disques de turbine dans un moteur a turbine a gaz |
TWI467971B (zh) * | 2006-10-26 | 2015-01-01 | Qualcomm Inc | 於多重存取無線通訊系統中編碼簿交換之方法及裝置 |
KR20100013251A (ko) * | 2008-07-30 | 2010-02-09 | 엘지전자 주식회사 | 다중안테나 시스템에서 데이터 전송방법 |
KR101056614B1 (ko) * | 2008-07-30 | 2011-08-11 | 엘지전자 주식회사 | 다중안테나 시스템에서 데이터 전송방법 |
CN101631004B (zh) * | 2009-08-10 | 2014-05-28 | 中兴通讯股份有限公司 | 一种预编码方法、系统及预编码码本的构造方法 |
US8761086B2 (en) * | 2009-11-02 | 2014-06-24 | Qualcomm Incorporated | Method and apparatus for hierarchical codebook design in wireless communication |
CN102271109B (zh) * | 2010-06-07 | 2015-08-12 | 中兴通讯股份有限公司 | 一种解调参考符号的映射方法及系统 |
US20120220286A1 (en) * | 2010-08-17 | 2012-08-30 | Texas Instruments Incorporated | Periodic Channel Quality Indicator on Physical Uplink Control Channel for Carrier Aggregation |
US8693421B2 (en) * | 2010-09-02 | 2014-04-08 | Texas Instruments Incorporated | Downlink 8 TX codebook sub-sampling for CSI feedback |
WO2012044088A2 (ko) * | 2010-09-29 | 2012-04-05 | 엘지전자 주식회사 | 다중 안테나 지원 무선 통신 시스템에서 효율적인 피드백 방법 및 장치 |
ES2840248T3 (es) * | 2010-09-29 | 2021-07-06 | Lg Electronics Inc | Método y aparato para la retroalimentación eficiente en un sistema de comunicación inalámbrica que soporta múltiples antenas |
KR20120033249A (ko) * | 2010-09-29 | 2012-04-06 | 엘지전자 주식회사 | 다중 안테나 지원 무선 통신 시스템에서 효율적인 피드백 방법 및 장치 |
JP2012100254A (ja) * | 2010-10-06 | 2012-05-24 | Marvell World Trade Ltd | Pucchフィードバックのためのコードブックサブサンプリング |
CN102447501B (zh) * | 2010-10-07 | 2015-04-29 | 上海贝尔股份有限公司 | 用于lte-a系统的对码本的子采样方法和设备 |
US9559820B2 (en) * | 2011-02-18 | 2017-01-31 | Qualcomm Incorporated | Feedback reporting based on channel state information reference signal (CSI-RS) groups |
US9673945B2 (en) * | 2011-02-18 | 2017-06-06 | Qualcomm Incorporated | Implicitly linking aperiodic channel state information (A-CSI) reports to CSI-reference signal (CSI-RS) resources |
CN102938688B (zh) * | 2011-08-15 | 2015-05-27 | 上海贝尔股份有限公司 | 用于多维天线阵列的信道测量和反馈的方法和设备 |
US9681425B2 (en) * | 2012-05-11 | 2017-06-13 | Qualcomm Incorporated | Rank-specific feedback for improved MIMO support |
US9048908B2 (en) * | 2012-09-11 | 2015-06-02 | Telefonaktiebolaget L M Ericsson (Publ) | Finding channel state information with reduced codebook in a multi-antenna wireless communication system |
US9143212B2 (en) * | 2013-02-25 | 2015-09-22 | Texas Instruments Incorporated | Codebook sub-sampling for CSI feedback on PUCCH for 4Tx MIMO |
US9401749B2 (en) * | 2013-03-08 | 2016-07-26 | Google Technology Holdings LLC | Method for codebook enhancement for multi-user multiple-input multiple-output systems |
US9667328B2 (en) * | 2014-03-31 | 2017-05-30 | Samsung Electronics Co., Ltd. | Precoding matrix codebook design and periodic channel state information feedback for advanced wireless communication systems |
-
2014
- 2014-03-21 CN CN201480016786.4A patent/CN105075141B/zh active Active
- 2014-03-21 EP EP14770655.0A patent/EP2996257B1/en active Active
- 2014-03-21 WO PCT/KR2014/002403 patent/WO2014148862A1/ko active Application Filing
- 2014-03-21 US US14/765,799 patent/US9647738B2/en active Active
- 2014-03-21 JP JP2016504257A patent/JP6464143B2/ja active Active
- 2014-03-21 RU RU2015144890A patent/RU2621010C2/ru active
- 2014-03-21 MX MX2015013412A patent/MX344538B/es active IP Right Grant
- 2014-03-21 KR KR1020157023835A patent/KR102194926B1/ko active IP Right Grant
-
2017
- 2017-04-05 US US15/480,140 patent/US20170207842A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120275542A1 (en) * | 2006-08-22 | 2012-11-01 | Nec Laboratories America, Inc. | Method for Transmitting an Information Sequence |
KR20120117932A (ko) * | 2010-04-05 | 2012-10-24 | 지티이 코포레이션 | 채널 상태 정보의 피드백 방법 및 시스템 |
WO2012039588A2 (ko) * | 2010-09-26 | 2012-03-29 | 엘지전자 주식회사 | 다중 안테나 지원 무선 통신 시스템에서 효율적인 피드백 방법 및 장치 |
KR20120031895A (ko) * | 2010-09-26 | 2012-04-04 | 엘지전자 주식회사 | 다중 안테나 지원 무선 통신 시스템에서 효율적인 피드백 방법 및 장치 |
Non-Patent Citations (2)
Title |
---|
AT &T: "Four antenna port codebook", R1-130852, 3GPP TSG-RAN WG1 #72, 28 January 2013 (2013-01-28), ST JULIAN'S, MALTA, XP050696686, Retrieved from the Internet <URL:http://isearch.3gpp.org/isysquery/dle3e07c-53e4-42ee-94a9-499853ed0c57/14/doc> * |
See also references of EP2996257A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP2996257A1 (en) | 2016-03-16 |
US20170207842A1 (en) | 2017-07-20 |
MX344538B (es) | 2016-12-19 |
RU2621010C2 (ru) | 2017-05-30 |
EP2996257A4 (en) | 2016-11-30 |
JP6464143B2 (ja) | 2019-02-06 |
US9647738B2 (en) | 2017-05-09 |
US20150365150A1 (en) | 2015-12-17 |
CN105075141A (zh) | 2015-11-18 |
JP2016518751A (ja) | 2016-06-23 |
KR20150140638A (ko) | 2015-12-16 |
RU2015144890A (ru) | 2017-05-03 |
MX2015013412A (es) | 2016-01-08 |
EP2996257B1 (en) | 2018-09-05 |
KR102194926B1 (ko) | 2020-12-24 |
CN105075141B (zh) | 2018-12-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR102157652B1 (ko) | 무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 | |
CN107104717B (zh) | 在无线通信系统中发送信道状态信息的方法和装置 | |
KR101769382B1 (ko) | 무선 통신 시스템에서 채널 상태 정보를 보고하는 방법 및 이를 위한 장치 | |
US9509383B2 (en) | Method and apparatus for transmitting channel state information in wireless communication system | |
KR102194926B1 (ko) | 무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 | |
CN110235390B (zh) | 周期性发送上行链路控制信息的方法和设备 | |
WO2014196831A1 (ko) | 무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 | |
WO2012102479A2 (ko) | 무선 통신 시스템에서 채널 상태 정보를 보고하는 방법 및 이를 위한 장치 | |
WO2014129842A1 (ko) | 무선 통신 시스템에서 랭크 인덱스의 비트 길이를 결정하는 방법 및 장치 | |
EP2945300B1 (en) | Method and device for transmitting and receiving signals by using codebook in wireless communication system | |
WO2015020373A1 (ko) | 무선 통신 시스템에서 채널상태정보 전송 방법 및 장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201480016786.4 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14770655 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14765799 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2014770655 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: IDP00201505024 Country of ref document: ID |
|
ENP | Entry into the national phase |
Ref document number: 20157023835 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2016504257 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: MX/A/2015/013412 Country of ref document: MX |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2015144890 Country of ref document: RU Kind code of ref document: A |