[go: up one dir, main page]

WO2012033290A2 - Dispositif d'émission et son procédé de communication, et dispositif de réception et son procédé de communication - Google Patents

Dispositif d'émission et son procédé de communication, et dispositif de réception et son procédé de communication Download PDF

Info

Publication number
WO2012033290A2
WO2012033290A2 PCT/KR2011/006085 KR2011006085W WO2012033290A2 WO 2012033290 A2 WO2012033290 A2 WO 2012033290A2 KR 2011006085 W KR2011006085 W KR 2011006085W WO 2012033290 A2 WO2012033290 A2 WO 2012033290A2
Authority
WO
WIPO (PCT)
Prior art keywords
precoder
codebook
information
limitation information
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2011/006085
Other languages
English (en)
Korean (ko)
Other versions
WO2012033290A3 (fr
Inventor
박경민
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pantech Co Ltd
Original Assignee
Pantech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020100088705A external-priority patent/KR20120024340A/ko
Application filed by Pantech Co Ltd filed Critical Pantech Co Ltd
Publication of WO2012033290A2 publication Critical patent/WO2012033290A2/fr
Publication of WO2012033290A3 publication Critical patent/WO2012033290A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

Definitions

  • the present specification relates to a wireless communication system, and relates to a wireless communication system using a multiple input multiple output antenna (MIMO) at both a transmitting and receiving end.
  • MIMO multiple input multiple output antenna
  • wireless communication systems such as 3GPP, Long Term Evolution (LTE), and LTE-A (LTE Advanced) are high-speed and large-capacity communication systems that can transmit and receive various data such as video and wireless data beyond voice-oriented services.
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • a transmitting apparatus including a precoder, determining beam limitation information for limiting at least one beamforming vector constituting a codebook of the precoder, and transmitting the determined beam limitation information to a receiving apparatus. It is possible to provide a communication method of a transmitting device comprising a step.
  • Another embodiment includes a layer mapper for mapping codewords to layers; A precoder for precoding a data symbol whose codeword is mapped to the layer by the layer mapper using a precoding matrix selected from its codebook; And an antenna array for transmitting signals output from the precoder, wherein the codeword may include beam limitation information for limiting at least one beamforming vector constituting the codebook of the precoder.
  • Another embodiment is a wireless communication system in which a transmitting device including a precoder transmits a signal, the receiving of receiving beam limitation information from the transmitting device limiting at least one beamforming vector constituting a codebook of the precoder. step; And transmitting a channel state information on the codebook of the precoder, except for the beamforming vectors limited in the beam restriction information, to the transmitting apparatus.
  • a receiver may include a channel information feedback device configured to transmit channel state information on a codebook of the precoder generated to the transmitter, excluding an antenna array and beamforming vectors limited by the beam limitation information.
  • FIG. 1 is a diagram schematically illustrating a wireless communication system to which embodiments are applied.
  • FIG. 2 is a cross-sectional view of a transmitting end or a transmitting apparatus (base station) for performing layer mapping and precoding.
  • FIG. 3 illustrates a wireless communication system in which a base station and a terminal exchange beam limitation information and channel state information during beam limitation.
  • FIG. 4 is a configuration diagram of each of a base station and a terminal according to an embodiment in a MIMO wireless communication system.
  • FIG. 5 is a flowchart illustrating a communication method of a transmitting apparatus according to another embodiment.
  • FIG. 6 is a flowchart illustrating a communication method of a receiving apparatus according to another embodiment.
  • FIG. 1 illustrates a wireless communication system to which embodiments are applied.
  • Wireless communication systems are widely deployed to provide various communication services such as voice and packet data.
  • a wireless communication system includes a user equipment (UE) 10 and a base station 20 (BS).
  • UE user equipment
  • BS base station 20
  • Terminal 10 in the present specification is a generic concept that means a user terminal in wireless communication, WCDMA, UE (User Equipment) in LTE, HSPA, etc., as well as MS (Mobile Station), UT (User Terminal) in GSM ), SS (Subscriber Station), wireless device (wireless device), etc. should be interpreted as including the concept.
  • WCDMA Wideband Code Division Multiple Access
  • UE User Equipment
  • HSPA High Speed Packet Access
  • MS Mobile Station
  • UT User Terminal
  • SS Subscriber Station
  • wireless device wireless device
  • a base station 20 or a cell generally refers to a station communicating with the terminal 10, and includes a Node-B, an evolved Node-B, an eNB, a Base Transceiver System (BTS), It may be called other terms such as an access point and a relay node.
  • BTS Base Transceiver System
  • the terminal 10 and the base station 20 are two transmitting and receiving entities used to implement the technology or the technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to.
  • One embodiment may be applied to asynchronous wireless communication evolving into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
  • LTE Long Term Evolution
  • GSM Global System for Mobile communications
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High Speed Packet Access
  • CDMA Code Division Multiple Access-2000
  • UMB Universal Mobile Broadband
  • the wireless communication system to which the embodiments are applied may support uplink and / or downlink hybrid automatic repeat request (HARQ), and may use a channel quality indicator (CQI) for link adaptation.
  • CQI channel quality indicator
  • multiple access schemes for downlink and uplink transmission may be different. For example, downlink uses Orthogonal Frequency Division Multiple Access (OFDMA), and uplink uses Single Carrier-Frequency Division Multiple Access (SC-FDMA). ) Can be used.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • a wireless communication system In order to support high-speed information transmission to a user, a wireless communication system considers using a multiple input multiple output (MIMO) technique in which information is transmitted through the same band using an antenna array including multiple antennas. .
  • MIMO multiple input multiple output
  • the MIMO wireless communication system transmits information on a propagation channel or feedback information on a precoder or precoding matrix (hereinafter referred to as a precoding matrix) suitable for a propagation channel to increase transmission capacity.
  • a precoding matrix a precoder or precoding matrix
  • an implicit feedback technique that delivers codebook based channel information or information on a transmission scheme suitable for a channel is commonly used. It is used in communication systems.
  • the precision of reporting on information is closely related to the size of the codebook or the amount of digital factors included in the codebook. This correlation allows the accuracy of the report to be proportional to the feedback overhead.
  • Codebook restriction or codebook subset restriction techniques are used to use larger size codebooks with less feedback overhead and to increase the accuracy of reporting.
  • Codebook restriction generates codebooks that contain various precoding matrices, and then selects precoding matrices to be used / not used for each cell unit or user equipment in the codebook, Codebook restriction information (hereinafter referred to as "codebook restriction information") for a coding matrix is a technique of using a different codebook for each cell unit or user unit.
  • codebook restriction information hereinafter referred to as "codebook restriction information”
  • the entire wireless communication system has a large codebook, but each cell or codebook used by each user consists of a subset of the codebook, which is small in size and consists of only precoding matrices suitable for a given environment. Coding gain can be increased.
  • the codebook restriction or codebook regeneration technique varies greatly depending on the construction of the codebook.
  • the present invention provides a codebook restriction scheme suitable for codebooks used in new wireless communication systems.
  • the commercial communication system uses an implicit feedback technique for digitally factoring channel information instead of an explicit feedback technique for directly transmitting channel information to a transmitter, and further reduces feedback overhead. If necessary, use additional codebook restriction techniques.
  • the implicit feedback technique is to limit the information to be reported to the transmitter by a finite number of digital information, and to select and select the digital information that is considered most effective in expressing the channel information measured in each reporting period.
  • This is a technique for reporting a factor indicating digital information to a transmitting end, for example, a base station.
  • a set of information consisting of finite numbers of digital information values must be designed, and the set of designed digital information is called a codebook.
  • Codebooks can be designed in two ways: 1) Codebooks are designed to represent channel information as finite (N) digital information. In consideration of all channel information that can be measured by a receiver, for example, a terminal, N digital values that can represent the channel information most effectively are selected and designed as a codebook. The receiving end compares the digital values registered in the codebook with the measured channel information in each reporting period, selects a digital value that best represents the measured channel information, and delivers it to the transmitting end. 2) Measure channel information and transmit information about the transmission scheme that is considered most suitable for use in the channel.
  • This method has the advantage that the codebook can be designed with a small number (K, K ⁇ N) of digital information compared to the explicit feedback method, and it is Long Term Evolution (LTE) or Long Term Evolution-Advanced (LTE-A). ),
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • the implicit feedback technique can be used by transmitting information on the precoder matrix determined to be suitable for the measured channel to the transmitter.
  • a channel information is reported using a codebook consisting of four digital information in a MIMO system using two antennas, each of a transmitter and a receiver.
  • the receiver When the receiver measures the following channel, it may be as follows.
  • the receiver reports a factor of “0” to the transmitter.
  • the number of digital information included in the codebook is four, at most two bits are used for reporting channel information in order to consider all reportable cases.
  • codebook restriction a method of selecting digital information which is determined not to be used by a specific terminal or a base station among digital information values registered in the basic codebook and setting it not to use.
  • FIG. 2 is a block diagram of a transmission terminal or a transmission apparatus (base station) that performs layer mapping and precoding.
  • a transmitting end or a transmitting device (base station) 50 that performs layer mapping and precoding is ranked through layer mapping of the layer mapper 52 in downlink.
  • Signals 1 to 4 are generated, and one of 16 precoder matrices is selected for each rank, and precoding is performed by the precoder 52.
  • Table 1 shows how to apply codebook restrictions.
  • the limiting factors a 0 to a 63 are selected for each of 64 digital information values in relation to the codebook limitation.
  • Each factor is “on”, meaning that the digital information corresponding to that factor is not used for reporting.
  • the digital information corresponding to a 0 ⁇ a 31 is not used for reporting.
  • the remaining 32 digital information values are marked using an index of 0 to 31, and the channel information or transmission method suitable for the channel is reported to the transmitter through a 5-bit feedback overhead.
  • LTE rel-8 Long Term Evolution release-8
  • LTE rel-8 Long Term Evolution release-8
  • each digital factor registered in the codebook corresponds to one precoder matrix, and a 1: 1 correspondence between each factor and the precoder matrix is established.
  • a wireless communication system uses a technique of applying a different precoding matrix for each subband, and precoding and Increase the accuracy of the feedback information.
  • the subband precoder matrix is divided into the "broadband portion" and the "subband portion” to reduce the feedback overhead increase caused by the PMI feedback per subband, compared to the conventional technique of reporting one PMI over the entire band.
  • the terminal may report this separately.
  • the bit required to report precoding-related information of each subband is N
  • the technique uses "wideband portion information" using K bits and "subband portion information” using L bits. Separate by. Since information that can be expressed using N bits is divided into two pieces of information that are represented using K and L bits, respectively, the condition of L ⁇ N can be satisfied and K + L> N according to the partitioning method. If the entire band consists of M subbands, the partitioning scheme requires feedback overhead of NM bits, while the partitioning scheme requires K + LM bits. In the case of K + LM ⁇ NM, the feedback overhead is reduced.
  • a feedback scheme of precoder structure and precoder matrix information may be as follows.
  • the wireless communication system performs the following dual structure precoding as shown in FIG. 4 in downlink transmission, and the overall operation of the precoding may be composed of two parts as follows. .
  • V n M is defined as Equation 2 below, and beamforming may be performed according to a signal transmission and reception direction.
  • a may be 1 or j, but is not limited thereto.
  • W1 may coincide with the spatial covariance of the dual polarized antenna array polarized at a constant distance as described with reference to FIG. 4.
  • Equation 1 Can perform co-phasing to correct for phase mismatch between antenna groups.
  • a characteristic of the precoder having the dual structure shown in FIG. 4 is that when the terminal reports channel state information for W1 and W2, the frequency bands to which W1 and W2 respectively correspond are different.
  • the UE can report one W1 and a plurality of W2s within a reporting period, and transmits one digital factor indicating W1 for all bands for which the UE wants to receive a signal, and multiple subbands for all bands. Inversely, the digital factor values determined to be suitable for use as W2 in each subband may be reported to the base station.
  • the reason for using the above scheme is to perform precoding using a different precoder matrix for each subband.
  • W1 and W2 may have a structure as follows.
  • the W1 matrix may be formed of non-adjacent beams.
  • each element of the codebook for reporting W1 is composed of a combination of a plurality of beam forming vectors, and as shown in Equation 4 above, each beam forming vector is two. It may be included in more than W1 k.
  • the 32 beamforming vectors of Equation 2 are represented by the beam indices n of 0 to 31 in the case of a transmission terminal including 8 antennas.
  • V 0 32 (1 , 1, e j ( ⁇ / 16) , e j (2 ⁇ / 16) ⁇
  • V 1 32 (1, e j ( ⁇ / 16) , e j (2 ⁇ / 16) , e j (3 ⁇ / 16) ⁇
  • V 2 32 (1, e j (2 ⁇ / 16) , e j (3 ⁇ / 16) , e j (4 ⁇ / 16) ⁇
  • V 31 32 (0, e j (31 ⁇ / 16) , e j (32 ⁇ / 16) , e j (33 ⁇ / 16) ⁇ .
  • W2 may be defined as in Equation 5. At this time, the operation of selecting one of a plurality of beam forming vectors included in W1 k and co-phasing are performed at the same time.
  • e i M may be a vector of length M having an i-th element of 1 and a remainder of 0.
  • a simpler example is as follows.
  • W1 PMI1 ⁇ W2 PMI2 described with reference to Equations 3 to 6 may be expressed as follows.
  • the UE examines the precoder matrix or beam forming vector to be used for each subband when reporting the precoder matrix, and searches N vectors (four according to the example of Equation 4) that are determined to be most frequently used. It is selected and defined as broadband part information and reported through PMI1. Equation 4 is an example of a case in which the UE selects four adjacent beamforming vectors when reporting broadband information. In addition to selecting the broadband portion information, the subband portion information is also determined and reported to the base station using PMI2.
  • the beam restriction in the feedback scheme of the precoder structure and the precoder matrix information is as follows.
  • the aforementioned dual structure precoder enables signal transmission through a different beam for each subband when transmitting a signal to each terminal, and also reduces feedback overhead through dual structure feedback. Has an effect.
  • codebook restriction is as follows.
  • the base station After the base station observes the channel condition for a long time, the base station examines the codebook element that the terminals connected to it are not expected to report or have a very low probability of reporting. Alternatively, the precoder matrix that will not be used when transmitting a signal to the terminal due to inter-cell interference occurs is examined.
  • the base station regenerates the codebook specialized for the base station based on the above-mentioned contents, and transmits information on codebook elements not to be used to the terminal.
  • the terminal After acquiring the terminal, the terminal regenerates the codebook in the same manner as the base station, and reports information on the precoder matrix to the base station using the specialized codebook. In the above process, the size of the codebook is reduced from L to M, so that the number of bits required to report the precoder matrix in Decreases.
  • a codebook has a characteristic that is distinct from the rel-8 codebook.
  • Each terminal selects a beam forming vector to be used to receive a signal in each subband, and the selected beam forming vector may be represented by a combination of two precoder matrices.
  • Each beam forming vector may be represented by a combination of two or more.
  • the beamforming vector (beam forming vector) not to be used by each terminal or the base station is represented as a codebook limitation, it is difficult to accurately indicate the limitation.
  • an element of W1 is selected in the manner illustrated in Equation 4, it may be as follows.
  • PMI1 is defined by the equation (4).
  • six of the PMI1 having the number of 16 cases are limited, 4 bits are required for PMI1 feedback regardless of the limitation, and therefore, feedback overhead reduction due to the limitation cannot be expected.
  • a communication method according to another embodiment of the present invention provides a method of beam restriction in a wireless communication system according to another embodiment of the present invention. That is, in order to solve the problem of inefficiency of codebook limitation, another embodiment of the present invention provides beam restriction.
  • the base station may notify the terminal or the terminal may notify the base station.
  • the base station or the terminal may directly report whether each of the beam forming vectors is used without considering the structure of W1 or W2.
  • the beam restriction information may be expressed in a bitmap format, but is not limited thereto and may be expressed in various formats.
  • the beam limitation information may be "11111111111111110000000000000000" (16 "1" and 16 "O") from the front.
  • the beam limitation information may be “11111111001111111100000000000000”.
  • the number of limiting beamforming vectors has been exemplarily described, the present invention is not limited thereto. Further, the number of limiting beamforming vectors may be fixed or variable for a certain time. For example, if the channel condition is good, the number of the same beamforming vectors may be limited.
  • the beam limitation information may be transmitted from the base station to the terminal through downlink control information, for example, an RRC signal through a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the beam limitation information may be transmitted from the base station to the terminal through another channel such as a physical downlink control channel (PDCCH) in addition to the PDSCH.
  • the beam limitation information can be transmitted from the base station to the terminal periodically or aperiodically by determining a transmission period or a transmission condition in the upper layer.
  • the number of cases of PMI1 was reduced from 16 to 8 by limiting 16 beam forming vectors of 32, resulting in 1-bit feedback overhead reduction. That is, the overhead reduction due to the limitation can be reflected.
  • the communication method according to another embodiment of the present invention may generate a "specialized codebook" reflecting beam restriction, and then implement CL-MIMO using the specialized codebook.
  • FIG. 3 illustrates a wireless communication system in which a base station and a terminal exchange beam limit information and channel state information when beam limitation is performed.
  • the base station and the terminal before the beam is limited by the beam limitation information the codebook is referred to as the "basic codebook”, and the codebook after the beam limitation is referred to as "specialized codebook" to distinguish both.
  • the wireless communication system 100 stores at least one terminal, for example, n terminals 110, in the base station 120 and the base station 120, similarly to the wireless communication system of FIG. 1. It may include.
  • the terminals 110 may be terminals currently connected or attempting additional access, but only one terminal is shown in FIG. 3.
  • the base station 120 includes a multi-stage precoder including at least two first and second precoders as described below.
  • the base station 120 includes N first precoding matrices used for the first precoder and M second precodes used for the second precoder and the basic first codebook 122 representing the first indexes for indexing them.
  • a second codebook 124 representing the coding matrices and the second indexes indexing them may be stored or generated.
  • the basic first codebook 122 may be W1 described above with reference to Equations 4 to 7
  • the second codebook 124 may be W2 described above with reference to Equations 4 to 7. The opposite may be true.
  • each element of the codebook for reporting W1 is composed of a combination of a plurality of beam forming vectors, and as shown in Eq. beamforming vector) may be included in two or more W1 k .
  • W2 simultaneously performs a task of selecting one of a plurality of beam forming vectors included in W1 k and a co-phasing operation.
  • the base station 120 may transmit beam restriction information to the terminal 110, as described with reference to Equation 10. This can solve the problem of inefficiency of the codebook limitation as described above.
  • the beam limitation information is information for limiting some of the beamforming vectors constituting the basic first codebook 122.
  • the base station or the terminal may directly report whether the base station 120 uses each of the beam forming vectors without considering the structure of the W1 or W2.
  • the beam limitation information may be "11111111111111110000000000000000" (16 "1" and 16 "O" from the front.
  • the number of limiting beamforming vectors has been exemplarily described, the present invention is not limited thereto. Further, the number of limiting beamforming vectors may be fixed or variable for a certain time. For example, if the channel condition is good, a large number of identical beamforming vectors may be limited, and vice versa, a small number of identical beamforming vectors may be limited.
  • the base station 120 transmits beam limit information 128 for limiting some of the beamforming vectors constituting the first codebook 122.
  • the base station 120 may transmit codebook restriction information for restricting at least one of the first codebook 122 or the second codebook 124 to the terminal, and transmit the codebook restriction information to the terminal and transmit the beam limitation information. It may optionally be done.
  • the sender side base station 120 transmits a reference signal, and the receiver side terminal 110 uses the reference signal.
  • the channel can be estimated.
  • the terminal 110 may estimate the downlink channel during downlink transmission.
  • the terminal 110 may estimate a channel of each subband.
  • the base station 120 may estimate the uplink channel during uplink transmission.
  • the specific signal or symbol is variously named as a reference signal, a reference symbol, a pilot symbol, etc., but in this specification, the specific signal or symbol is referred to as a reference signal, but is not limited to the term. Do not.
  • the reference signal is not only used for the estimation of the frequency domain channel but may also be used for position estimation, control information transmission / reception, transmission / reception of scheduling information, transmission / reception of feedback information, and the like, which are necessary in a wireless communication process between the terminal and the base station.
  • reference signals in uplink transmission include DM-RS (Demodulation RS) and SRS (Sounding RS).
  • Reference signals in downlink transmission include DM-RS (Demodulation RS), CRS (Cell-specific RS), MBSFN RS, and UE-specific RS.
  • CSI-RS as a reference signal transmitted from a base station in order to acquire channel state information (CSI) of a center cell or neighbor cells in the terminal 20 during downlink transmission.
  • the CSI-RS may be used to report a Channel Quality Indicator (CQI) / Precoder Matrix Index (PMI) / Rank Index (RI).
  • CQI Channel Quality Indicator
  • PMI Precoder Matrix Index
  • RI Rank Index
  • the terminal 110 includes a plurality of first precoding matrices used in the first precoder and a basic first codebook 112 and a second precoder representing the first indexes indexing them.
  • a second codebook 114 representing the M second precoding matrices used and the second indexes indexing them may be stored or generated.
  • the first codebook 112 and the second codebook 114 are the same or the same as the first codebook 122 and the second codebook 124 stored in the base station 120, respectively. Can be generated.
  • the terminal 110 may receive the above-described beam limit information 128 from the base station 120.
  • the beam limitation information 128 may directly include whether to use each of the beam forming vectors.
  • the beam restriction information may be expressed in a bitmap format, but is not limited thereto and may be expressed in various formats.
  • the beam limitation information may be transmitted from the base station to the terminal through downlink control information, for example, an RRC signal through a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the beam limitation information may be transmitted from the base station to the terminal through another channel such as a physical downlink control channel (PDCCH) in addition to the PDSCH.
  • the beam limitation information can be transmitted from the base station to the terminal periodically or aperiodically by determining a transmission period or a transmission condition in the upper layer.
  • the terminal 110 may sequentially generate or calculate new specialized codebooks for other beamforming vectors except for beamforming vectors whose usage is limited in the beam restriction information 128 according to the beam limitation information 128 as shown in Equation 12. .
  • the first codebook 112 of the terminal 110 receives the beam restriction information 128 from the basic codebook before transmitting the beam restriction information 128 and then restricts the use of the beam restriction information 128.
  • a specialized codebook generated or calculated with other beamforming vectors other than the formation vectors see Equation 12).
  • the terminal 110 may report / feed back the thus-formed first channel state information 132 for the one selected from the specialized first codebook 112 to the base station 120.
  • each terminal 110 may determine a second precoding matrix and report / feed back the second channel state information 134 of the second precoding matrix to the base station 120.
  • the second channel state information 134 may be reported / feedback to the base station 120.
  • the base station 120 uses the channel state information 132 and 134 reported from each terminal 110 as the new beamforming vectors except for the beamforming vectors whose use is restricted in the beam restriction information 128.
  • the precoding matrices of the first precoder and the second precoder are determined from the generated first codebook 122 and the second codebook 124, which are sequentially generated or calculated, and the data symbols are used. Precode.
  • the first codebook 122 of the base station 120 transmits the beam restriction information 128 from the basic codebook before transmitting the beam restriction information 128 and then restricts the use of the beam restriction information 128.
  • a specialized codebook generated or calculated with other beamforming vectors other than the formation vectors (see Equation 12).
  • the base station 120 finally transmits the precoded signal to the terminal 110.
  • the terminal 110 decodes the original data after receiving the signal.
  • FIG. 4 is a configuration diagram of each of a base station and a terminal according to an embodiment in a MIMO wireless communication system.
  • the MIMO wireless communication system 400 may include a terminal 410 and a base station 420.
  • the terminal 410 and the base station 420 perform a process of exchanging beam limit information and channel state information by the base station and the terminal in the beam limiting wireless communication system described with reference to FIG. 3.
  • the terminal 410 is an antenna array 411 for receiving a signal through a downlink channel and a post-decoder 412 for processing the received signal and decoding the original data symbol using a precoding matrix. And an information feedback device 414.
  • Antenna array 411 may use multiple antennas.
  • the antenna array 411 may form a polarized antenna array.
  • an array may be implemented using a dual polarized antenna array in which two antennas having different polarizations are alternately installed.
  • the post decoder 412 corresponds to the first precoder 422 and the second precoder 424 of the base station 420.
  • the post decoder 412 transmits the received reference signal to the channel information feedback device 414.
  • the antenna array 411 may receive the above-described beam limit information from the base station 420 through downlink control information, for example, an RRC signal through a physical downlink shared channel (PDSCH).
  • the beam limitation information may be received from the base station 420 to the terminal through another channel such as a physical downlink control channel (PDCCH) in addition to the PDSCH.
  • the post decoder 412 may decode a signal received through the PDSCH into original beam limit information using a precoding matrix.
  • the channel information feedback device 414 may receive the reference signal and estimate the channel using the reference signal.
  • the channel information feedback device 414 may generate channel information including the first channel state information and the second channel state information described with reference to FIG. 3.
  • the channel information feedback device 414 may feed back this channel information to the base station 420.
  • the channel information feedback device 414 determines the thus formed first channel state information 132 and the second precoding matrix for the selected one from the specialized first codebook 112 and the second to the second precoding matrix.
  • the channel state information 134 may be reported / feedback to the base station 120.
  • the base station 420 includes a layer mapper 421 for mapping a codeword to a layer, a precoder 425 for precoding the layer-mapped data symbols using a precoding matrix, and a precoded signal on air. It includes an antenna array 428 to transmit to.
  • the precoder 425 may include a first precoder 422 and a second precoder 424 for precoding data symbols. In this case, the first precoder 422 and the second precoder 424 may precode the data symbols by their first precoding matrix and the second precoding matrix, respectively.
  • the two precoders 422 and 424 do not have a physical form but perform precoding. It can be a logical operation block.
  • the base station 420 may transmit the above-described beam limitation information to the terminal 410 through downlink control information, for example, an RRC signal through a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the base station 420 may transmit the beam limitation information to the terminal 410 through another channel such as a physical downlink control channel (PDCCH) in addition to the PDSCH.
  • PDCCH physical downlink control channel
  • the layer mapper 421 layer-maps the above-described beam limitation information into codewords, and the two-stage precoder 425 precodes the layer-mapped data symbols using a precoding matrix, and the antenna array 428. May transmit this precoded signal to the air.
  • Antenna array 428 of base station 420 may use multiple antennas.
  • the antenna array 428 may form a polarized antenna array.
  • an array may be implemented using a dual polarized antenna array in which two antennas having different polarizations are alternately installed.
  • the antenna arrays 411 and 428 are exemplarily described as using a dual polarized antenna array, but the present invention is not limited thereto.
  • the base station 420 may report / feed back the first channel state information and the second channel state information from the channel information feedback device 414 of the terminal 410 through the antenna array 428.
  • the base station 420 sequentially generates or calculates new specialized codebooks using other beamforming vectors except for beamforming vectors whose usage is limited in the beam restriction information based on the channel state information reported from each terminal 410.
  • Precoding matrices of the first precoder 422 and the second precoder 424 are determined in the specialized first codebook and the second codebook, and the data symbols are precoded using the precoding matrices.
  • the first codebook of the base station 420 is generated with other beamforming vectors except beamforming vectors whose use is restricted in the beam restriction information after the beam restriction information is transmitted from the basic codebook before the beam restriction information is transmitted.
  • Calculated specialized codebook see Equation 12).
  • the feedback period or the interval between the first channel state information and the second channel state information may be different.
  • the first channel state information may be fed back to the base station 420 in a short term
  • the second channel information may be fed back to the base station 420 in a long term.
  • the long period / long term and the short period / short term mean relative to each other
  • the long period / long term means a longer period than the short period / short term.
  • the MIMO wireless communication system for transmitting and receiving codebook restriction information and channel ecological information has been described above.
  • a communication method of a transmission apparatus according to another embodiment will be described.
  • FIG. 5 is a flowchart illustrating a communication method of a transmitting apparatus according to another embodiment.
  • a communication method 600 of a transmission apparatus includes a layer mapping step of mapping a codeword to a layer (S610), a precoding step of precoding symbols (S620), and two or more antennas. It may include a transmission step (S630) for propagating the precoded symbol through the air. Since the layer mapping step S610, the precoding step S620, and the transmission step S630 are the same as described above, a detailed description thereof will be omitted.
  • the communication method 600 of the base station may transmit beam restriction information for limiting each beamforming vector to the terminal 410.
  • the beam limitation information may be transmitted from the base station 420 to the terminal 410 through downlink control information, for example, an RRC signal through a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the beam limitation information may be transmitted from the base station 420 to the terminal 410 through another channel such as a physical downlink control channel (PDCCH) in addition to the PDSCH.
  • PDCCH physical downlink control channel
  • the beam limitation information can be transmitted from the base station to the terminal periodically or aperiodically by determining a transmission period or a transmission condition in the upper layer.
  • the beam limitation information may be mapped to a layer as a downlink control signal.
  • FIG. 6 is a flowchart illustrating a communication method of a receiving apparatus according to another embodiment.
  • a communication method 700 of a receiver apparatus receives beam limitation information receiving step S710 for receiving beam limitation information from a transmitter, and transmits first channel state information and second channel state information to the transmitter.
  • beam limitation information (128 of FIG. 3) may be received from the base station.
  • the beam limitation information 128 may directly include whether to use each of the beam forming vectors.
  • the terminal 110 In operation S720, the terminal 110 generates new codebooks other than beamforming vectors other than beamforming vectors whose use is limited in the beam limitation information 128 according to the beam limitation information 128. Can be generated or calculated sequentially.
  • the terminal 110 may report / feed back the first channel state information 132 thus formed to the base station 120.
  • each terminal 110 may determine a second precoding matrix and report / feed back the second channel state information 134 of the second precoding matrix to the base station 120.
  • Embodiments as described above may be applied to uplink / downlink MIMO systems, as well as a single cell environment, as well as a coordinated multi-point transmission / reception system (CoMP) and heterogeneous networks. It may be applied to all uplink / downlink MIMO systems.
  • CoMP coordinated multi-point transmission / reception system
  • Ranks 3 to 8 may apply the same manner or system.
  • W1 is 8 adjacent overlapping beams, for example When expressed as a beam index, ⁇ 0,1,2,... , 7 ⁇ , ⁇ 4,5,6,... , 11 ⁇ , ⁇ 8,9,10,... , 15 ⁇ , ⁇ 12,.. , 15,0,... , 3 ⁇ can be used.
  • W2 may use 16 codebooks or codewords in rank 3 and 8 codebooks or codewords in rank 4.
  • the codebook itself may be limited as described in the above embodiment, but some of the beamforming vectors or beams constituting the codebook may be limited and the codebook may be configured as the rest.
  • beam limiting information for limiting beamforming vectors or beams constituting the codebook in one codebook of two precoders is provided.
  • the terminal receives the digital index information (PMI) for the codebook selected from the specialized codebook.
  • a precoder consists of only one precoder and consists of beamforming vectors or beams of a codebook for the precoding matrix for this precoder and limits at least one of the beamforming vectors or beams. You can also send information.
  • the precoder consists of three or more precoders and constitutes a codebook for the precoding matrix for one of the precoders with beamforming vectors or beams and at least one of the beamforming vectors or beams. You can also send beam limit information that limits one.
  • a dual polarization antenna array has been described as an example, but the present invention is not limited thereto.
  • it may be a multi-polarized antenna array, such as a triple polarized wave or quadrupole antenna array.
  • the present invention is not limited to the polarized antenna array but may be applicable to a general antenna array.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un mode de réalisation de la présente invention porte sur un système de communication sans fil, et sur un système de communication sans fil utilisant une antenne MIMO pour toutes ses fonctions d'émission/réception.
PCT/KR2011/006085 2010-09-06 2011-08-18 Dispositif d'émission et son procédé de communication, et dispositif de réception et son procédé de communication Ceased WO2012033290A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2010-0087197 2010-09-06
KR20100087197 2010-09-06
KR1020100088705A KR20120024340A (ko) 2010-09-06 2010-09-10 송신장치 및 그 통신방법, 수신장치, 그 통신방법
KR10-2010-0088705 2010-09-10

Publications (2)

Publication Number Publication Date
WO2012033290A2 true WO2012033290A2 (fr) 2012-03-15
WO2012033290A3 WO2012033290A3 (fr) 2012-05-03

Family

ID=45811036

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2011/006085 Ceased WO2012033290A2 (fr) 2010-09-06 2011-08-18 Dispositif d'émission et son procédé de communication, et dispositif de réception et son procédé de communication

Country Status (1)

Country Link
WO (1) WO2012033290A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022039303A1 (fr) * 2020-08-20 2022-02-24 엘지전자 주식회사 Procédé permettant de générer un faisceau d'antenne dans un système de communication sans fil prenant en charge la bande thz, et appareil associé

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101273466B1 (ko) * 2007-01-08 2013-06-14 삼성전자주식회사 다중 입출력 시스템을 위한 프리코딩 코드북 생성 장치 및그 방법
US7983322B2 (en) * 2007-01-09 2011-07-19 Broadcom Corporation Method and system for codebook design of MIMO pre-coders with finite rate channel state information feedback

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022039303A1 (fr) * 2020-08-20 2022-02-24 엘지전자 주식회사 Procédé permettant de générer un faisceau d'antenne dans un système de communication sans fil prenant en charge la bande thz, et appareil associé
KR20230051656A (ko) * 2020-08-20 2023-04-18 엘지전자 주식회사 Thz 대역을 지원하는 무선 통신 시스템에서 안테나의 빔을 생성하기 위한 방법 및 이를 위한 장치
KR102775133B1 (ko) * 2020-08-20 2025-03-04 엘지전자 주식회사 Thz 대역을 지원하는 무선 통신 시스템에서 안테나의 빔을 생성하기 위한 방법 및 이를 위한 장치

Also Published As

Publication number Publication date
WO2012033290A3 (fr) 2012-05-03

Similar Documents

Publication Publication Date Title
WO2012005476A2 (fr) Dispositif d'émission et procédé permettant la communication avec ce dispositif, et dispositif de réception et procédé permettant la communication avec ce dispositif
WO2020141951A1 (fr) Procédé et appareil de mesure d'interférence dans un système de communication sans fil
WO2012002753A2 (fr) Méthodes, terminal et station de base pour l'émission et la réception d'informations de canal
WO2010151067A2 (fr) Procédé de sélection de précodeur dans un système de communication sans fil et appareil l'utilisant, procédé de retour de l'information de canal du terminal et procédé de réception d'informations de canal de la station de base
WO2011162532A2 (fr) Procédé pour transmettre des informations concernant un canal, dispositif correspondant, station de base et procédé de transmission destiné à une station de base correspondante
WO2010123313A2 (fr) Techniques de rétroaction d'information d'état de canal dans un système de communication sans fil
WO2017111494A1 (fr) Schéma pour configurer un signal de référence et communiquer des informations d'état de canal dans un système de communication sans fil utilisant des ports d'antenne multiples
WO2018026241A1 (fr) Procédé et appareil de coordination de transmission multipoint dans des systèmes sans fil évolués
WO2011087258A2 (fr) Appareil et procédé pour retour d'informations de canal, station de base recevant les informations de canal, et procédé de communication de la station de base
WO2016089124A1 (fr) Procédé et appareil de signalisation de liaison descendante pour retour d'informations de csi-rs et de csi partiellement précodées
WO2012002747A2 (fr) Systèmes et procédés pour l'utilisation d'un livre de codes 8-tx et la transmission de signaux de réaction dans un réseau sans fil 3gpp
WO2014046485A1 (fr) Procédé et appareil de rétroaction à utiliser dans un système de communication mobile
WO2016148469A1 (fr) Procédé et appareil de mesure d'informations d'état de canal dans un système de communication
WO2017086753A1 (fr) Procédé et dispositif d'émission et de réception d'informations d'état de canal dans un système de communications sans fil utilisant des antennes multiples
WO2012096532A2 (fr) Procédé et dispositif pour régler une ressource de mesure d'informations d'état de canal dans un système de communication sans fil
WO2011046317A2 (fr) Procédé et appareil de commutation de mode entre un mode de communication coordonnée multicellule et un mode de communication mimo monocellule
WO2011099794A2 (fr) Appareil de rétroaction d'informations d'état de canal et procédé associé, station de base et procédé de transmission de ladite station
WO2013025051A2 (fr) Procédé et appareil permettant la coordination du brouillage intercellulaire pour un groupe de points de transmission
WO2012096476A2 (fr) Procédé et dispositif d'émission/réception de signal de référence de liaison descendante dans un système de communication sans fil
WO2015084051A1 (fr) Procédé de rétroaction de csi, et appareil d'un système d'antennes multiples
WO2012002673A2 (fr) Procédé et dispositif d'émission/réception d'informations d'état de canal dans un système de communication sans fil
WO2016013882A1 (fr) Procédé et appareil de transmission d'informations d'état de canal dans un système de communications sans fil
WO2014069821A1 (fr) Dispositif et procédé pour la transmission d'un signal de référence dans un système à plusieurs antennes
WO2011053084A2 (fr) Dispositif de rétroaction d'information de voie et procédé correspondant, et procédé de commutation de mode, terminal de communication et système de station de base utilisant un tel dispositif et un tel procédé
WO2017188736A2 (fr) Procédé et appareil conçus pour permettre une opération mimo en liaison montante

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11823723

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11823723

Country of ref document: EP

Kind code of ref document: A2