WO2016013750A1 - 무선 통신 시스템에서 단말 이동성 기반 프리코더 순환 기법을 이용한 신호 송신 방법 및 이를 위한 장치 - Google Patents
무선 통신 시스템에서 단말 이동성 기반 프리코더 순환 기법을 이용한 신호 송신 방법 및 이를 위한 장치 Download PDFInfo
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- precoder
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- 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
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- 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
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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- 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
- H04B7/0617—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 for beam forming
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- 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]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a signal transmission method and apparatus therefor using a terminal mobility-based precoder cyclic scheme in a wireless communication system.
- LTE 3rd Generat ion Partnership Project Long Term Evolut ion
- FIG. 1 is a schematic diagram of an E-UMTS network structure as an example of a wireless communication system.
- E-UMTS may be referred to as a Long Term Evolut ion (LTE) system.
- LTE Long Term Evolut ion
- an E-UMTS is an access gateway located at an end of a user equipment (UE) and a base station (eNode B), an eNB, and an network (E-UTRAN) and connected to an external network; AG)
- 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 of 1.25, 2.5, 5, 10, 15, 20Mhz, etc. 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 determine time / frequency domain, encoding, data size, HARQ hybr id automat ic repeat and reQuest (related information), etc., to which the data is transmitted to the corresponding UE. Inform.
- the base station transmits uplink scheduling information to uplink (UL) data, and informs the user equipment of time / frequency domain, encoding, data size, HARQ related information, etc. available to the user equipment.
- An interface for transmitting user traffic or control traffic may be used between base stations.
- the core network (CN) may be composed of an AG and a network node for user registration of the terminal.
- the AG manages mobility of the UE in units of a TA Tracking Area including a plurality of cells.
- the present invention proposes a signal transmission method using a terminal mobility-based precoder cyclic scheme and a device therefor in a wireless communication system.
- a method for transmitting a signal from a transmitting end to a receiving end in a wireless communication system includes: configuring a precoder set including one or more precoders; Precoding the signal by cyclically applying one or more precoder in a specific resource unit; And transmitting the precoded signal to the receiver at all times, wherein the size of the precoder set and at least one of the one or more precoders are determined based on the mobility of the receiver. do.
- the beam of the precoded signal when the mobility of the receiver is high
- the width is preferably wider than the beam width of the precoded signal when the mobility of the receiver is low.
- configuring the precoder set may include receiving information about at least one preferred precoder from the receiving end; And selecting one or more precoders based on the at least one preferred precoder.
- configuring the precoder set may include selecting at least one specific precoder based on mobility of the receiving end; And selecting one or more precoders based on the at least one specific precoder.
- configuring the precoder set may include: receiving information about at least one preferred precoder from the receiving end; Setting a reference precoder set within a predetermined beamforming angle range around the at least one preferred precoder; And configuring the precoder set from the reference precoder set based on the mobility of the receiver.
- the method further comprises transmitting information about the precoder set to the receiving end, wherein the information about the precoder set comprises the one or more pre-sets included in the precoder set. It is characterized by including the sorting information of the coder.
- a transmission apparatus in a wireless communication system comprises a precoder set including one or more precoder, and cyclically applies one or more precoder in a specific resource unit to apply the signal. And a wireless communication module for transmitting the precoded signal to a receiving device, wherein the processor is configured to transmit at least one of a size of the precoder set and the at least one precoder. and based on mobi li ty.
- the beam width of the precoded signal when the mobility of the receiver is high is wider than the beam width of the precoded signal when the mobility of the receiver is low.
- the processor may select one or more precoders based on at least one preferred precoder received from the receiving device.
- the processor may select one or more precoders based on at least one specific precoder selected based on the mobility of the receiving device.
- the processor sets a reference precoder set within a predetermined pan-forming angle range around at least one preferred precoder received from the receiving apparatus, and based on the mobility of the receiving apparatus, the reference precoder.
- the precoder set may be constructed from a coder set.
- the information about the precoder set is provided to the receiving device, and the information about the precoder set is sorting information of the one or more precoders included in the precoder set. Characterized in that it comprises a.
- a base station in a wireless communication system can perform beamforming more efficiently in conformity with terminal mobility.
- FIG. 1 is a diagram schematically illustrating an E-UMTS network structure as an example of a wireless communication system.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on a 3GPP radio access network standard.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on a 3GPP radio access network standard.
- FIG. 3 is a diagram for explaining a general signal transmission method using physical channels used in the 3GPP system.
- FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
- FIG. 5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
- FIG. [25] tr 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- FIG. 7 is a schematic diagram of a general multi-antenna (MIM0) communication system.
- MIM0 multi-antenna
- FIG. 8 is a diagram for explaining an antenna tilting method.
- FIG. 9 is a diagram comparing an existing antenna system and an active antenna system.
- FIG. 10 shows an example of forming a terminal specific category based on an active antenna system.
- FIG. 11 illustrates a three-dimensional beam transmission scenario based on an active antenna system.
- FIG. 12 is a diagram illustrating comprehensive coverage of a conventional MIM0 transmission method and a B beamforming method.
- t 13 is a diagram illustrating a concept of a DA bump forming technique.
- [33] 14 is a diagram illustrating features of the DA bump forming technique.
- FIG. 15 is a diagram illustrating a concept of a DBA bump forming technique.
- Figure 18 illustrates the concept of a single PMI based precoder decision scheme according to the present invention.
- Figure 19 shows an example of a single PMI based precoder determination scheme according to the present invention.
- [38] 20 shows another example of a single PMI based precoder determination scheme according to the present invention.
- Figure 21 illustrates the concept of a multiple PMI based precoder decision scheme in accordance with the present invention.
- [40] 22 shows an example of a multiple PMI based precoder determination scheme according to the present invention.
- [41] 23 shows another example of a multiple PMI based precoder determination scheme according to the present invention.
- ⁇ 24 shows an example of tracking channel quality variation according to PMI.
- Figure 25 shows another example of a multiple PMI based precoder determination scheme according to the present invention.
- Figure 26 illustrates a block diagram of a communication device according to an embodiment of the present invention. [Form for implementation of invention]
- the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, but this is an example and the embodiment of the present invention can be applied to any communication system corresponding to the above definition.
- the present specification describes an embodiment of the present invention based on the FDD method, but this is an example embodiment of the present invention can be easily modified and applied to the H-FDD method or the TDD method.
- the specification of the base station may be used in a generic term including a remote radio head (RRH), an eNB, a transmission point (TP), a receptor ion point (RP), a relay, and the like. .
- RRH remote radio head
- eNB transmission point
- RP receptor ion point
- relay a relay
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard.
- the control plane refers to a path through which control messages used by a user equipment (UE) and a 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 Informat ion Transfer Service to a higher 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.
- the physical channel is modulated by an Orthogonal Frequency Division Multiple Access (FDMA) scheme in downlink, and a single carrier frequency division multiple access (SC-FDMA) in uplink. Modulated in such a way.
- FDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA single carrier frequency division multiple access
- the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the LC layer of Layer 2 supports reliable data transmission.
- the function of the RLC layer may be implemented as a functional block inside the MAC.
- the PDCKPacket Data Convergence Protocol (Layer 2) layer of the second layer provides unnecessary control information to efficiently transmit IP packets such as IPv4 or IPv6 over a narrow bandwidth wireless interface. Performs header compression, which is reduced.
- 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 association with radio bearers (RBs), conf igurat ions, re-conf igurat ions, and releases.
- 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 connected (RRC Connected) between the terminal and the RRC layer of the network, the terminal is in the RRC connected mode (Connected Mode), otherwise it is in the RRC idle mode (Idle Mode).
- the non-access stratum (NAS) layer above the RRC layer performs the functions of session management and mobility management.
- 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 MCH (mult icast channel). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
- RACH random access channel
- SCH uplink shared channel
- BCCH Broadcast Control
- PCCH transport channel Channel
- PCCH Paging Control Channel
- CCCH Common Control Channel
- MCCH Multicast Control Channel
- MTCH Mult icast Traffic Channel
- 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
- the terminal If the terminal is powered on or enters a new cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S301). To this end, 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. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. On the other hand, the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- 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 After the initial cell discovery, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information carried on the PDCCH to provide a more specific system.
- Information can be obtained (S302).
- the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
- RACH random access procedure
- the UE may transmit a specific sequence as a preamble through a physical random access channel (PRACH) (S303 and S305), and may receive a response message for the preamble through the PDCCH and the Daesung PDSCH. (S304 and S306).
- PRACH physical random access channel
- S304 and S306 In case of contention-based RACH, a content ion 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) transmission (S308) may be performed.
- the terminal is connected to the PDCCH Downlink control information (Downl Ink Control Informat ion; DCI) is received.
- the DCI includes control information such as resource allocation information for the terminal, and the format is different depending on the purpose of use.
- the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station is a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), PMK Precoding Matr ix Index (CQI), RKRank Indi cator) and the like.
- the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.
- 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> ⁇ 1 ⁇ ) and consists of 10 equally sized subframes.
- Each subframe has a length of 1ms and consists of two slots.
- Each slot has a length of 0.5 ms (15360 XT s ).
- the slot contains a plurality of 0FDM symbols in the time domain, and a plurality of in the frequency domain Resource Block (RB) of the.
- RB Resource Block
- one resource block includes 12 subcarriers X 7 (6) 0 FDM symbols.
- Transition Time Interval which is a unit time at which data is transmitted, may be determined in units of one or more subframes.
- the structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slot 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 0FDM symbols.
- the first 1 to 3 0FDM symbols are used as the control region and the remaining 13 to 11 0FDM symbols are used as the data region.
- R1 to R4 represent reference signals (RSs) or Pi lot signals for antennas 0 to 3.
- RS is constant within a subframe regardless of the control region and data region. It is fixed in a pattern.
- 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), PHICHCPhysical Hybrid-ARQ Indicator CHannel (PCH), and PDCCH (Physical Downlink Control CHannel).
- the PCFICH is a physical control format indicator channel and informs the UE of the number of OFDM symbols used for the PDCCH in every subframe.
- the PCFICH is located in the first 0FOM symbol and is set in preference to the PHICH and PDCCH.
- the PCFICH is composed of four Resource Element Groups (REGs), and each REG is distributed in a control region based on a Cell ID (Cell IDentity).
- One REG is composed of four resource elements (REs).
- RE represents a minimum physical resource defined by one subcarrier and one OFDM 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 hybrid automatic repeat and request (HARQ) indicator channel and is used to carry HARQ ACK / NACK for uplink transmission.
- HARQ physical hybrid automatic repeat and request
- PHICH 1
- It is composed of REGs and is cell-specifically scrambled.
- ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
- SF Spreading Factor
- a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
- the number of PHICHs multiplexed into the PHICH group is determined according to the number of spreading codes.
- the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
- the PDCCH is a physical downlink control channel and is allocated to the first n 0FDM 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.
- the PDCCH transmits information related to resource allocation of a transmission channel (PCH) and DL-SCHCDownl ink-shared channel (PCH), uplink scheduling grant, and HARQ information to each UE or UE group.
- Inform. Paging channel (PCH) and Down ink-shared channel (DL) 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.
- a specific PDCCH is CRC masked with a Radio Network Temporary Identity (RNTI) of "A”, a radio resource (eg, frequency location) of "B” and a DCI format of "C", that is, transmission
- RTI Radio Network Temporary Identity
- B radio resource
- C DCI format
- the terminal in the cell monitors, that is, blindly decodes, the PDCCH in the search region by using the RNTI information of the cell, and if there is at least one terminal having an "A" RNTI, the terminals receive and receive the PDCCH.
- the PDSCH indicated by "B” and "C” is received through the information of one PDCCH.
- FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- an uplink subframe may be divided into a region in which a Physical Upl Ink Control CHannel (PUCCH) carrying control information is allocated and a region in which a Physical Upl Ink Shared CHannel (PUSCH) carrying user data is allocated.
- the middle part of the subframe is allocated to the PUSCH, and both parts of the data area are allocated to the PUCCH in the frequency domain.
- the control information transmitted on the PUCCH includes ACK / NACK used for HARQ, CQKChannel Quality Indicator indicating downlink channel status, RKRank Indicator for MIM0), SR (Scheduling Request) which is an uplink resource allocation request, and the like. have.
- the PUCCH for one UE uses one resource block that occupies a different frequency in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are frequency hoped at the slot boundary.
- MIMO iple-Input Mul- tple Output
- MIMO is a method of using a plurality of transmission antennas and a plurality of reception antennas, and this method can improve data transmission / reception efficiency. That is, by using a plurality of antennas at the transmitting end or the receiving end of the wireless communication system, the capacity can be increased and the performance can be improved.
- 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.
- N r transmitting antennas are provided at the transmitting end, and N receiving antennas are provided at the receiving end.
- N r transmitting antennas are provided at the transmitting end
- N 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 one antenna is used is i? If 0 , the transmission rate when using multiple antennas can theoretically increase by multiplying the rate of increase rate by the maximum transmission rate 0 as shown in Equation 1 below. Where ⁇ is the smaller of N r .
- the mathematical modeling may be expressed as follows. As shown in FIG. 7, it is assumed that N r transmit antennas and N receive antennas exist. First, referring to the transmission signal, when there are N r transmit antennas, since the maximum transmittable information is N r , the transmission information may be represented by a vector shown in Equation 2 below.
- the transmission power may be different in each transmission information ⁇ .
- the transmission information whose transmission power is adjusted is represented by a vector as shown in Equation 3 below.
- Equation 5 ⁇ is the weight between the ⁇ th transmit antenna and the _ / th information. It is called the w weight matrix or the precoding matrix.
- the physical meaning of the tank of the channel matrix is the maximum number that can send different information in a given channel. Therefore, the rank of the channel matrix is defined as the minimum number of independent rows or columns, so that the tanks of the matrix are larger than the number of rows or columns. It becomes impossible.
- the tank rank (H) of the channel matrix H is limited as shown in Equation 6 below.
- each of the different information sent using the multi-antenna technique is a 'stream' or simply 'stream'.
- a 'stream' is called 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. Therefore, the channel matrix H can be expressed as 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.
- each of the base station and the terminal may perform bumpforming based on channel state information in order to obtain a mult ixing gain of the MIM0 antenna.
- the base station transmits a reference signal to the terminal in order to obtain the channel state information from the terminal, and feeds back the channel state information measured based on the Physical Upl Ink Control CHannel (PUCCH) or the Physical Upl Ink Shared CHannel (PUSCH).
- PUCCH Physical Upl Ink Control CHannel
- PUSCH Physical Upl Ink Shared CHannel
- CSI is classified into three types of information: RI (Rank Indicator), PMK Precoding Matrix Index (CRI), and Channel Quality Indicat ion (CQI).
- RI represents tank information of a channel as described above, and means the number of streams that a terminal can receive through the same frequency-time resource.
- CQI Channel Quality Indicat ion
- PMI is a value reflecting spatial characteristics of a channel and indicates a precoding matrix index of a base station preferred by a terminal based on a metric such as SINR.
- 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 In more advanced communication systems, such as the LTE-A standard, it has been added to obtain additional multi-user diversity (mult i-user MIM0) using MU-MIMO (mult i-user MIM0).
- MU-MIM0 there is interference between UEs multiplexed in the antenna domain, so the accuracy of CSI may have a significant effect on interference of not only UEs reporting CSI but also other UEs multiplexed. Therefore, MU-MIM0 requires more accurate CSI reporting than SU-MIM0.
- the final PMI is designed to be divided into Wl, which is a long term and / or wideband PMI, and W2, which is a short term and / or sub-band PMI. It was decided to.
- Equation 8 An example of a hierarchical codebook transformat ion method of constructing one final PMI from the W1 and W2 information is a long-term covariance matrix (ix) of a channel as shown in Equation 8 below. It is available. [102] [Equation 8]
- W2 is a short term PMI, which is a codeword of a codebook configured to reflect short channel information
- W is a codeword of a final codebook
- orm (A) is a gambling of each column of the matrix A. norm) means a matrix normalized to one.
- Equation 9 The specific structure of the existing and W2 is shown in Equation 9 below.
- the structure of a codeword is generated when a cross polarized antenna is used and the spacing between antennas is dense, for example, when the distance between adjacent antennas is less than half of the signal wavelength. It is a structure designed to reflect the correlation characteristics of channels.
- the antenna can be divided into a horizontal antenna group and a vertical antenna group. Each antenna group has characteristics of a ULA miform linear array antenna, and the two antenna groups coexist. (co-located).
- the correlation between antennas of each group has the same linear phase increment characteristic, and the correlation between antenna groups has phase rotation characteristic.
- the codebook is a quantized value of the channel, it is necessary to design the codebook to reflect the characteristics of the channel.
- the Tank 1 codeword having the above-described structure may be illustrated as in Equation 10 below.
- the codeword is expressed as a vector of the number of transmit antennas ⁇ ⁇ L , and is structured as an upper vector x '(and a lower vector ⁇ ⁇ ⁇ , and each of the horizontal antenna group and the vertical antenna group X ' () is advantageously represented as a vector having a linear phase increase characteristic reflecting the correlation between antennas of each antenna group, and a representative example may be a DFT matrix.
- a base station reduces mechanical interference by using mechanical tilting or electrical tilting, and reduces throughput between terminals in a cell, eg, SINR (Signal to Interference plus noisy se rat io) has been used. It will be described in more detail with reference to the drawings.
- SINR Signal to Interference plus noisy se rat io
- FIG. 8 is a diagram for explaining an antenna tilting method.
- FIG. 8A illustrates an antenna structure to which no antenna tilting is applied
- FIG. 8B illustrates an antenna structure to which mechanical tilting is applied
- FIG. 8C illustrates mechanical tilting and electrical tilting. Both show an antenna structure applied.
- FIG. 9 illustrates a comparison between an existing antenna system and an active antenna system (MS).
- FIG. 9A illustrates an existing antenna system
- FIG. 9B illustrates an active antenna system.
- each of the plurality of antenna modules includes an F module including a power amplifier, that is, an active element, and thus, power and power for each antenna module may be different.
- This system is characterized by adjustable phase.
- the MIM0 antenna structure considered is considered to be linear, that is, one-dimensional array antenna such as ULA mi form inear array.
- a bump that can be generated by bump forming exists in a two-dimensional plane.
- PAS Passive Antenna System
- the vertical antennas are tied to one RF model so that beamforming in the vertical direction is impossible, and only the above-described mechanical tilting is applicable.
- the beams that can be generated may be expressed in three-dimensional space in the vertical and horizontal directions, and thus may be referred to as three-dimensional beamforming.
- 3D beamforming has been made possible by evolving from a 1D array antenna structure to a planar 2D array antenna structure.
- 3D bump forming is not only possible when the antenna array has a planar shape, but 3D beamforming is possible even in a ring structure of 3D shape.
- the characteristic of 3D bump forming is that MIM0 process is performed in 3D space because of various types of antenna arrangements rather than the existing 1D array antenna structure.
- FIG. 10 shows an example of forming a terminal specific beam based on an active antenna system. Referring to FIG. 10, it can be seen that beamforming is possible not only when the terminal moves to the left and right of the base station but also when moving forward and backward due to the 3D bump forming, thereby providing a higher degree of freedom in forming the terminal specific category.
- the transmission environment using the antenna structure of the active antenna-based two-dimensional array includes not only an environment transmitted from the outdoor base station to the outdoor terminal, but also an environment transmitted by the outdoor base station to the indoor terminal (021, Outdoor to Indoor) and The indoor base station transmits the indoor hot spot to the indoor terminal.
- the base station may not only terminal-specific horizontal range steering but also vertical beam steering capability considering various terminal heights according to building height. There is a need to consider. Considering such a cell environment, it is necessary to reflect channel characteristics that are much different from the existing wireless channel environment, for example, changes in shadow / path loss due to height differences and fading characteristics.
- three-dimensional bump forming is an evolution of horizontal beamforming, which was performed only in the horizontal direction based on a linear one-dimensional array antenna structure, and includes an antenna of a multi-dimensional array such as a planar array.
- MIM0 processing technique that is extended and combined to elevation beamforming or vertical beamforming based on a structure or a mesh antenna array.
- the mesh antenna array may have one or more of the following characteristics. That is, located in 0 two-dimensional plane or three-dimensional space, ⁇ ) more than eight logical or physical antennas (where logical antennas can be represented by antenna ports), and iii) each antenna can be configured as an AAS. .
- the definition of the mesh antenna array is not limited thereto.
- various bump forming techniques using a mesh antenna array will be described.
- A) Partial antenna array based bump forming applied in a 3D beamforming environment is referred to as beam-width adaptat ion (BA) bump forming, and has the following characteristics.
- FIG. 12 is a diagram for comparing the coverage of the existing MIM0 transmission scheme and the BA bumpforming scheme.
- FIG. 12 shows a conventional MIM0 transmission scheme, and the right figure shows a BA beamfoam scheme.
- the width transmitted by the 4x4 antenna array is too narrow to secure channel accuracy, and the open loop scheme covers the entire cell coverage. It may be too wide. 12, only the center 2x2 antenna array is used for transmission. Participation allows the beam to be generated in such a way that it has a relatively wide breadth but gains. That is, according to the moving speed of the terminal, the number of antennas participating in the transmission is reduced to increase the beam width, thereby obtaining a beam gain higher than that of the closed loop beamforming, but higher than the open loop beamforming.
- the BA beamforming is a technique for adjusting the beam width according to the mobility of the UE, beamforming is performed only in the vertical or horizontal direction according to the movement direction of the UE and open loop precoding in the other direction.
- This technique is referred to as a Dimension Adaptat ion (DA) beamforming technique because it enables 2D beamforming in a 3D beamforming environment.
- DA Dimension Adaptat ion
- the base station adopts an open loop method in a direction in which a base station moves severely, that is, in a direction in which Doppler is strong, in a vertical direction and a horizontal direction of a terminal, and uses a closed loop method in a direction that does not exist. It is a pan-forming technique to apply and transmit.
- 13 is a diagram illustrating a concept of a DA beamforming technique. In particular, the left figure of FIG. 13 illustrates a case in which the terminal moves in a horizontal direction, and the right figure illustrates a case in which the terminal moves in a vertical direction.
- FIG. 14 is a diagram illustrating features of a DA bump forming technique.
- the DA beamforming technique When the DA beamforming technique is used, beam gain can be obtained in a direction in which Doppler is small and beam gain in a direction in which Doppler is large. Therefore, the narrow beam is formed only in one of the horizontal direction and the vertical direction as shown in FIG. 14. Therefore, it is possible to give a certain level of beam gain to the terminal moving in a specific direction.
- DBA dimension and beam-width adaptation
- the DBA beamforming technique combines the DA beamforming technique with the BA beamforming technique.
- DBA beamforming when DBA beamforming is applied, when a terminal moves in a vertical or horizontal direction, closed loop bump forming is performed in a direction in which Doppler is small, that is, a direction orthogonal to the movement of the terminal, and a certain level of Doppler exists.
- Doppler a direction in which Doppler is small
- a certain level of Doppler exists.
- Adjust the width by adjusting the number of participating antennas.
- the DA beamforming is a valid technique when moving in a specific direction based on a base station
- the BA beamforming is a technique effective in an environment in which a terminal moves at low to medium speeds. Is a valid technique when the terminal moves at a low to medium speed in a specific direction.
- BA beamforming or DBA beamforming has a feature of controlling the width in accordance with the channel change characteristic, in particular, the movement of the terminal, specifically, the moving speed of the terminal.
- antenna 0N / 0FF transmit power and phase control technology for each antenna may be used.
- the present invention proposes a precoder cycling technique having a limited bump forming range.
- the precoder cyclic scheme according to the present invention has a feature in that the lower the moving speed of the terminal, the narrower the beam coverage due to the precoder circulation, and the higher the moving speed of the terminal, the longer the beam coverage.
- the general coverage may mean a range of beamforming angles of the circulating precoder.
- the base station configures the terminal specific precoder set according to the feedback information related to the preferred precoder of the terminal and the temporal channel change characteristic of the terminal, and sets the corresponding precoder in units of specific time / frequency. It is proposed to apply the precoders in turn.
- PMI feedback information may be considered.
- the temporal channel change characteristic of the terminal may be determined by measuring a characteristic of an uplink signal, or may be determined by measuring a temporal change amount of the terminal position or channel related information (eg, PMI, CQI, etc.). have.
- the terminal is information related to the temporal channel change characteristic (for example, Doppler frequency, speed of the terminal, coherence time Can be identified by feedback.
- the specific time / frequency unit may exemplify a symbol, a subframe, a frame, etc. on the time side, and a subcarrier, a resource block, a resource block group, etc., on the frequency side.
- some of the precoders included in the precoder set proposed in the present invention may not be included in the PMI codebook for precise effective beam width control. That is, a precoder not defined in the PMI codebook may be applied to the precoder set.
- a terminal specific precoder set is expressed as ⁇ Xi ' ' X w ⁇ .
- the first embodiment it is proposed to determine precoders included in a precoder set according to UE channel change characteristics.
- the first embodiment may be divided into a single PMI based precoder determination method and a multiple PMI based precoder determination method.
- the precoding matrix can be expressed by Equation 11 below.
- the matrix P is a precoding matrix corresponding to the selected PMI and has an N-shape size.
- N ' is the number of transmit antennas and N s is the number of layers.
- 0 means a switching function corresponding to the th precoding matrix, and is determined according to the channel change characteristic of the terminal.
- the precoding matrix ' may be configured as shown in Equation 12 below.
- R in equation (12) may be a matrix phase fluctuation, defined as a dia s0 function for switching the size of the vector into a diagonal matrix of size ⁇ ⁇ ⁇ .
- the matrix p , i -refers to M selected precoding matrices included in the PMI codebook.
- the M PMI may considering ⁇ ⁇ of PMI and channel variability terminal a terminal feedback the base station is configured with selected ⁇ _ ⁇ ⁇ one PMI.
- ⁇ _ ⁇ ⁇ one PMI Of course, the case of ° 1 1 is also possible.
- 0 means a synthesis and conversion function corresponding to the th precoding matrix.
- the number ⁇ and / or / '() of the ⁇ selected by the terminal is determined according to the channel change characteristic of the terminal.
- ⁇ 2
- x «, P, + (i- «,) P 2 (where “'is a number between ⁇ and 1).
- ⁇ 2
- ⁇ and G ' denote phase shift matrices.
- a method of changing the size N of the precoder set according to the temporal channel change characteristic of the UE based on the reference precoder set set irrespective of the temporal channel change characteristic of the UE may be applied.
- the precoder set may be determined as follows.
- the transmitter pre-configures a set of UE-specific reference precoders of a predetermined number (for example, 100) in the range of -X to + X, centered on the receiver, that is, the PMI preferred by the terminal.
- a predetermined number for example, 100
- X may be a predefined value.
- Step 2 Determine a portion of the reference precoder set as the precoder set according to the change in channel status. For example, select only those categories that fall within -deg ⁇ deg.
- Y is a value smaller than X and may be determined in conjunction with the terminal moving speed.
- the reference precoder set may be a system using a pre-defined coder set in a system or a network.
- a subset is configured in the corresponding reference precoder set according to the PMI and channel variation of the UE, and a precoder set to be applied to data transmission for the UE is determined.
- the widths of the five precoders when the terminal is moving at a low speed may be smaller than the beam widths of the five precoders when the terminal is moving at a high speed.
- 17 is a beamforming method according to the second embodiment, in which the number of precoders included in the precoder set when the terminal is moving at a low speed is three, and the terminal moves at a high speed. It can be seen that the number of precoders included in the precoder set in the case of being less than five is smaller.
- a single PMI based precoder determination scheme and a multiple PMI based precoder determination scheme may be used in both the first embodiment and the second embodiment.
- a Doppler environment and a user channel are changed by generating a precoder set based on a PMI selected by a terminal or a base station (in a predefined codebook) and alternately using the precoders included in each resource. Even in the environment, a certain number of beams give a gain.
- the method of PMI selection is largely 1) a method of using the PMI selected and reported by the terminal, 2) a method of determining the base station through the uplink measurement channel, and 3) a terminal mobility information of the PMI obtained through one of the above two methods. We can consider using PMI to select the corrected PMI.
- FIG. 19 shows an example of a single PMI based precoder determination scheme according to the present invention. In particular, it is assumed that FIG. 19 applies the method of 3) above.
- the base station selects the PMI by correcting the PMI selected and reported by the terminal using mobility information, and generates a precoder set based on the selected PMI.
- a technique for predicting a channel change of the terminal may be additionally required.
- FIG. 20 shows another example of a single PMI based precoder determination scheme according to the present invention.
- FIG. 20 assumes that the method of 1) above is applied.
- the base station generates a precoder set in consideration of the moving direction and speed of the terminal based on the PMI selected and reported by the terminal.
- the method of 2) may also be applied in the same manner except that the base station selects the PMI.
- Figure 21 illustrates the concept of a multiple PMI based precoder determination scheme, in accordance with the present invention.
- a plurality of PMIs selected by a terminal or a base station are selected, and a precoder set is generated through any combination of the selected PMIs.
- Some or all of the selected plurality of PMIs may be PMIs selected by the UE or PMIs calculated through a channel measured by the base station through uplink.
- some of the plurality of PMI may be a PMI selected by the base station according to the mobility of the terminal.
- FIG. 22 shows an example of a multiple PMI based precoder determination scheme according to the present invention.
- FIG. 22 illustrates a case in which the UE reports a single PMI.
- the base station when reporting a single PMI, the base station selects an additional PMI by using mobility information of the terminal, that is, a moving direction ⁇ speed, and then generates a precoder set by combining two PMIs.
- FIG. 23 shows another example of a multiple PMI based precoder determination scheme according to the present invention.
- FIG. 23 exemplifies a case in which the UE reports multiple PMIs.
- the UE may select and report a plurality of PMIs while estimating a change amount of a preferred PMI and / or a channel quality change amount of a corresponding PMI.
- the number of PMIs reported by the terminal may be either a method controlled by the base station or a method determined and determined by the terminal.
- the UE may determine the plurality of PMIs based only on the channel quality at the time of channel measurement, but ideally, reports a PMI set having the maximum quality at the time of data transmission. shall.
- the PMI set should be selected through tracking PMI and quality variation tracking of the PMI mentioned above.
- 24 illustrates an example of tracking channel quality variation according to PMI. Especially 24 illustrates channel quality variation for PMI at TO and ⁇ . Referring to FIG. 24, it is understood that PMI2 and PMI3 should be selected as the channel quality criteria, but PMI3 and PMI4 should be selected and reported if the channel is predicted at a future time point T2 to which data is transmitted.
- the determined precoder set does not necessarily include a pre-selected PMI set.
- the PMI may include a low granularity PMI set.
- FIG. 25 illustrates another example of a multiple PMI based precoder determination scheme according to the present invention.
- the terminal reports PMI1 and PMI2 and the base station selects it, and it can be seen that a precoder set is configured based on PMI1 and PMI2. However, it can be seen that the precoder set excludes the selected precoders PMI1 and PMI2.
- the terminal may transmit some or all of the following information to the base station.
- the base station may provide some or all of the following information in order to inform the terminal of the precoding scheme information or to obtain information for applying the channel redundancy precoder cyclic scheme.
- the existing PMI codebook there may be a problem that it may be difficult to generalize and apply the precoder set generation function because the PMI is not arranged in the angular transmission angle order. Therefore, it may be necessary to rearrange the PMI to suit the precoder set generation function, and in this case, PMI sorting informat ion among the information may be provided to the terminal.
- the PMI alignment information may be delivered to the terminal as dedicated control information, but may be delivered as broadcast information like system information. Alternatively, the system may predefine PMI alignment information in the case of a channel mandatory precoder cyclically applied transmission mode and apply it without additional signaling.
- the proposed technique can be applied to a MIM0 precoder to be applied in a vertical direction and / or a horizontal direction in a 3D MIM0 environment.
- the beam width adaptat ion through the antenna 0N / 0FF can be applied as a BA bump forming method other than the beamforming method, and when applied to only one of the vertical direction and the horizontal direction, the DBA bump forming method is used. It is possible. '
- the proposed technique can also be used to control the width of the width according to the moving speed and the direction of the terminal or to adaptively control the beam width to other channel parameters that are not determined according to the moving speed and the direction. For example, as the angular spread of a wireless channel or the number and distribution of ray clusters can vary the gain, the technique can be used to control the width based on the parameters. Can be. In more detail, when the diffusion angle of the channel is large or the number of ray clusters is large and distributed, it may be determined that the gain due to the bump forming is relatively small and the channel variability is high in the future. In this case, the technique may be applied in the form of wider range. In addition to the above examples, the adjustment of the width can be determined and applied according to various criteria, and the technique of the present invention adjusts the width regardless of the criteria or the purpose. It can be utilized as a means.
- the PMI feedback information has been described on the basis of measuring and reporting one value for the entire frequency bandwidth for convenience, but this is not limiting.
- separate feedback information may be fed back to a specific frequency domain (eg, subband, subcarrier, resource block, carrier, sal, etc.) for each frequency domain.
- feedback information may be transmitted only for a specific frequency region selected by the terminal or designated by the base station.
- the frequency domain may consist of one or more frequency contiguous regions or of frequency discontinuous regions.
- the present invention has been described on the basis of downlink, but this is not limitative.
- the base station serves as a terminal and the terminal changes as a base station, so the present proposal can be applied.
- the present proposal may be applied since terminal 1 is applied in the form of a base station and terminal 2.
- 26 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the communication device 2600 includes a processor 2610, a memory 2620, an RF module 2630, a display module 2640 and a user interface modules 2650.
- the communication device 2600 is shown for convenience of description and some models may be omitted. In addition, the communication device 2600 may further include all necessary modules. In addition, some of the mothers in the communication device 2600 can be divided into more granular ones.
- the processor 2610 is configured to perform an operation according to an embodiment of the present invention illustrated with reference to the drawings. Specifically, detailed operations of the processor 2610 are described with reference to FIGS.
- the memory 2620 is connected to the processor 2610 and stores an operating system, an application, a program code, data, and the like.
- the RF module 2630 is connected to the processor 2610 and performs a function of converting a baseband signal into a wireless signal or converting a wireless signal into a baseband signal. For this purpose, the RF module 2630 performs analog conversion, amplification, filtering and frequency up-conversion, or the reverse process thereof.
- Display modules 2640 are coupled to the processor 2610 and display various information. Display modules 2640 are not limited to this Well-known elements such as liquid crystal displays (LCDs), light emitting diodes (LEDs), and 0rganic light emitting diodes (0LEDs) can be used.
- the user interface modules 2650 are connected to the processor 2610 and can be configured with a combination of well known user interfaces such as a keypad, touch screen, and the like.
- the specific operation described to be performed by the base station in this document may be performed by an upper node in some cases. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
- a base station may be replaced by terms such as fixed station, Node B, eNode B (eNB), access point, and the like.
- an embodiment of the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more ASICs (application integrated speci- fic integrated circuits), digital signal processor (DSPs), digital signal processing devices (DSPDs), and PLDs (programmable). logic devices, FPGAs (ield programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention is It may be implemented in the form of modules, procedures, functions, etc. that perform the described functions or operations.
- 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.
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Priority Applications (4)
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US15/324,168 US9866295B2 (en) | 2014-07-24 | 2015-03-31 | Method for transmitting signal using terminal mobility-based precoder cycle technique, and apparatus therefor |
EP15824278.4A EP3174219B1 (en) | 2014-07-24 | 2015-03-31 | Method for transmitting signal using terminal mobility-based precoder cycle technique, and apparatus therefor |
JP2017502653A JP6356332B2 (ja) | 2014-07-24 | 2015-03-31 | 無線通信システムにおいて端末移動性に基づくプリコーダー循環技法を用いた信号送信方法及びそのための装置 |
KR1020167036266A KR102314316B1 (ko) | 2014-07-24 | 2015-03-31 | 무선 통신 시스템에서 단말 이동성 기반 프리코더 순환 기법을 이용한 신호 송신 방법 및 이를 위한 장치 |
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WO2018026159A1 (ko) * | 2016-08-03 | 2018-02-08 | 주식회사 케이티 | 무선망에서의 신호 품질 예측 방법 및 그 방법을 수행하는 장치 |
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KR102166810B1 (ko) * | 2018-09-17 | 2020-10-16 | 한양대학교 산학협력단 | 밀리미터 대역에서 사용자의 움직임을 추정하여 빔의 폭을 조절하는 송신단 방향에서의 빔포밍 방법 및 시스템 |
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KR20240011153A (ko) * | 2021-05-25 | 2024-01-25 | 엘지전자 주식회사 | 무선 통신 시스템에서 신호 전송 방법 및 장치 |
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WO2018126409A1 (zh) * | 2017-01-05 | 2018-07-12 | 广东欧珀移动通信有限公司 | 一种信令传输方法及设备 |
US20190349925A1 (en) * | 2017-01-05 | 2019-11-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Signaling transmission method and device |
RU2736110C1 (ru) * | 2017-01-05 | 2020-11-11 | Гуандун Оппо Мобайл Телекоммьюникейшнз Корп., Лтд. | Способ и устройство передачи служебных сигналов |
US11115978B2 (en) | 2017-01-05 | 2021-09-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Signaling transmission method and device |
Also Published As
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US9866295B2 (en) | 2018-01-09 |
KR20170035845A (ko) | 2017-03-31 |
JP6356332B2 (ja) | 2018-07-11 |
EP3174219A1 (en) | 2017-05-31 |
EP3174219A4 (en) | 2018-04-04 |
KR102314316B1 (ko) | 2021-10-19 |
EP3174219B1 (en) | 2019-11-06 |
JP2017530577A (ja) | 2017-10-12 |
US20170207834A1 (en) | 2017-07-20 |
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