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WO2014098401A1 - Terminal, procédé par lequel le terminal reçoit des informations, station de base, et procédé par lequel la station de base transmet des informations - Google Patents

Terminal, procédé par lequel le terminal reçoit des informations, station de base, et procédé par lequel la station de base transmet des informations Download PDF

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Publication number
WO2014098401A1
WO2014098401A1 PCT/KR2013/011436 KR2013011436W WO2014098401A1 WO 2014098401 A1 WO2014098401 A1 WO 2014098401A1 KR 2013011436 W KR2013011436 W KR 2013011436W WO 2014098401 A1 WO2014098401 A1 WO 2014098401A1
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WIPO (PCT)
Prior art keywords
pbch
subframe
dmrs
index
reference signal
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English (en)
Korean (ko)
Inventor
박동현
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Pantech Co Ltd
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Pantech Co Ltd
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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
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2078—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the phase change per symbol period is constrained
    • H04L27/2082—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the phase change per symbol period is constrained for offset or staggered quadrature phase shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • 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
    • 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
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code

Definitions

  • the present invention relates to an apparatus and method for transmitting and receiving MIB (Master Information Block information) based on DMRS.
  • MIB Master Information Block information
  • NCT new carrier type
  • NCT is a non-primary CC among component carriers (CC) hereinafter merged through a carrier aggregation (CA) technique.
  • the CC refers to a secondary CC that reduces overhead to increase payload size in CC, that is, a component carrier that does not include a control region.
  • S-NCT standalone NCT
  • NS-NCT non-standalone NCT
  • It is divided into NCT, and control signals such as Physical Downlink Control Channel (PDCCH), Physical HARQ Indicator Channel (PHICH), Physical Control Format Indicator Channel (PCFICH), and Cell-specific Reference Signal (CRS) will not be transmitted in NCT. to be.
  • PDCCH Physical Downlink Control Channel
  • PHICH Physical HARQ Indicator Channel
  • PCFICH Physical Control Format Indicator Channel
  • CRS Cell-specific Reference Signal
  • the terminal transmits a master information block (MIB), which is system information, through a PBCH (Physical Broadcast Channel) among control signals after the cell discovery process, and after the system information is received and decoded, the terminal performs a random access process You can access the cell via MIB (Master Information block)
  • MIB master information block
  • PBCH Physical Broadcast Channel
  • an information receiving method of a terminal to provide a terminal, an information receiving method of a terminal, a base station and a base station information transmission method for providing a MIB which is system information based on DMRS in NCT.
  • one physical broadcast channel (PBCH) transport bit block including a number of bits corresponding to the number of encoded bits M bits to be transmitted on a physical broadcast channel (PBCH) is provided.
  • PBCH physical broadcast channel
  • QPSK quadrature phase-shift keying
  • radio frame index n f is There is at least one radio frame that satisfies, and for four consecutive radio frames including the radio frame, a complex symbol block y (p) (0), ..., y (p) at each antenna port Frequency index k in ascending order in a specific slot of subframe 0 or subframe 0 of the 4 radio frames for (k, l) resource elements not allocated for reference signal transmission among (M symb- 1).
  • mapping each bit of the precoded PBCH transmission bit block by increasing the OFDM symbol index l and increasing the index n f of the radio frame.
  • one physical broadcast channel transport bit block including a number of bits corresponding to the number of encoded bits (M bits ) to be transmitted on a physical broadcast channel (Physical Broadcast CHannel, PBCH)
  • PBCH Physical Broadcast CHannel
  • QPSK quadrature phase-shift keying
  • a radio frame exists, and in four consecutive radio frames, including the corresponding radio frame, of each of the complex symbol blocks y (p) (0), ..., y (p) (M symb -1) at each antenna port.
  • a controller for mapping the pre-coding performed the PBCH for each bit of the transmission bit block characterized in that it comprises; and a transmitter for transmitting a MIB (Master Information Block) via the mapping of PBCH Channel Provide a base station.
  • MIB Master Information Block
  • a physical broadcast channel is searched based on a demodulation reference signal (DMRS) and a master information block (MIB) transmitted through the PBCH.
  • DMRS demodulation reference signal
  • MIB master information block
  • Extracting at least one radio frame in which the radio frame index n f satisfies n f mod4 0, and includes four consecutive radio frames while including the corresponding radio frame.
  • a physical broadcast channel is searched based on a demodulation reference signal (DMRS) and a master information block (MIB) transmitted through the PBCH.
  • DMRS demodulation reference signal
  • MIB master information block
  • a receiving unit for extracting a); wherein the receiving unit includes at least one radio frame in which the radio frame index n f satisfies n f mod 4 0 and includes the corresponding radio frame in the PBCH search.
  • one of the complex symbol blocks y (p) (0), ..., y (p) (M symb -1) at each antenna port is not allocated for reference signal transmission (k, l )
  • the frequency index k is increased in ascending order in the specific slot of subframe 0 or subframe 0 of the 4 radio frames
  • the OFDM symbol index l is increased
  • the index n f of the radio frame is Increase To provide a terminal, it characterized in that to search for the respective bits of the PBCH transmission bit block.
  • channel estimation performance of PBCH can be improved based on DMRS while preventing collision between PSS / SSS and demodulation reference signal (DMRS) for NCT that does not include a control region in a CA environment.
  • DMRS demodulation reference signal
  • PBCH can be adaptively allocated according to various DMRS patterns to avoid collision with PSS / SSS, thereby reducing PBCH channel estimation error and effectively providing system information, thereby enabling fast and accurate cell access.
  • FIG. 1 is a diagram illustrating a communication system to which embodiments of the present invention are applied.
  • FIG. 2 is a diagram illustrating a PBCH transport channel processing procedure.
  • 3 is a view for explaining an RS and PBCH allocation scheme.
  • FIG. 4 is a diagram for explaining a cell access procedure to which the present invention is applied.
  • 5 and 6 illustrate examples for explaining a PBCH mapping scheme according to an embodiment of the present invention.
  • FIG. 7 is another example for explaining a PBCH mapping scheme according to an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating another example for explaining a PBCH mapping scheme according to an embodiment of the present invention.
  • FIG. 9 and 10 illustrate another example for explaining a PBCH mapping scheme according to an embodiment of the present invention.
  • FIG. 11 is a diagram illustrating another example for describing a PBCH mapping scheme according to an embodiment of the present invention.
  • FIG. 11 is a diagram illustrating another example for describing a PBCH mapping scheme according to an embodiment of the present invention.
  • FIG. 12 is a diagram for explaining a DMRS pattern according to another embodiment of the present invention.
  • FIG. 13 and 14 illustrate examples for explaining a PBCH mapping scheme according to another embodiment of the present invention.
  • 15 and 16 illustrate examples for explaining a PBCH mapping scheme according to another embodiment of the present invention.
  • 17 and 18 are diagrams illustrating other examples for describing a PBCH mapping scheme according to another embodiment of the present invention.
  • 19 is a diagram for explaining a DMRS pattern according to another embodiment of the present invention.
  • 20 and 21 are diagrams for describing examples of the PBCH mapping scheme according to another embodiment of the present invention.
  • FIG. 22 is a diagram for explaining an example of the PBCH mapping scheme according to another embodiment of the present invention.
  • FIG. 23 is a diagram illustrating an information transmission apparatus for performing embodiments according to the present invention.
  • FIG. 24 is a diagram for explaining an information transmission method performed by the apparatus of FIG. 23 according to the present invention.
  • 25 is a diagram illustrating an information receiving apparatus for performing embodiments according to the present invention.
  • FIG. 1 is a diagram illustrating a communication system to which embodiments of the present invention are applied.
  • Communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.
  • a communication system includes a user equipment (UE) 10 and a transmission point 20 that performs uplink and downlink communication with the terminal 10.
  • UE user equipment
  • transmission point 20 that performs uplink and downlink communication with the terminal 10.
  • a terminal 10 or a user equipment (UE), a receiving end is a comprehensive concept of a user terminal in wireless communication, and a mobile station (MS) in GSM as well as a UE in WCDMA and LTE, HSPA, etc. It should be interpreted as a concept that includes a user terminal (UT), a subscriber station (SS), a wireless device, and the like.
  • the transmitting end 20 or cell generally refers to a station communicating with the terminal 10, and includes a base station, a node-B, an evolved node-B, and a base transceiver. Other terms may be referred to as a system, an access point, a relay node, and a radio unit (RU).
  • RU radio unit
  • the transmission terminal 20 or a cell should be interpreted in a comprehensive sense indicating a part of a region covered by a base station controller (BSC) in a CDMA, a NodeB of a WCDMA, etc., and a radio remote connected to a base station. All types of communication with one terminal such as head, relay node, sector of macro cell, site, other femtocell, picocell, micro cell such as RU (Radio Unit) Used as a generic concept to mean a device.
  • BSC base station controller
  • one terminal 10 and one transmission terminal 20 are shown in FIG. 1, the present invention is not limited thereto. It is possible for one transmission terminal 20 to communicate with the plurality of terminals 10, and one terminal 10 may communicate with the plurality of transmission terminals 20.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • OFDM OFDM
  • the present invention is a combination of the TDD (Time Division Duplex) method is transmitted using a different time, uplink transmission and downlink transmission, FDD (Frequency Division Duplex) method is transmitted using a different frequency, combining the TDD and FDD Applicable to hybrid duplexing method.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • embodiments of the present invention are applicable to asynchronous wireless communication that evolves into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB.
  • LTE Long Term Evolution
  • WCDMA Long Term Evolution-advanced through GSM
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High Speed Packet Access
  • CDMA Code Division Multiple Access
  • CDMA-2000 Code Division Multiple Access-2000
  • UMB Universal Mobile Broadband
  • the transmitting end 20 performs downlink transmission to the terminal 10.
  • the transmitter 20 may transmit a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission in a legacy carrier type (LCT).
  • PDSCH physical downlink shared channel
  • the transmitting end 20 grants scheduling control for transmission on downlink control information such as scheduling required for reception of the PDSCH and uplink data channel (for example, a physical uplink shared channel (PUSCH)).
  • Physical Downlink Control Channel (PDCCH) for transmitting information
  • Physical Control Format Indicator Channel (PCFICH) for transmitting an indicator for distinguishing regions of PDSCH and PDCCH
  • uplink transmission A control channel such as a physical HARQ indicator channel (PHICH) for transmitting a HARQ (Hybrid Automatic Repeat reQuest) confirmation may be transmitted.
  • PHICH physical HARQ indicator channel
  • HARQ Hybrid Automatic Repeat reQuest
  • the transmitter 20 may transmit a physical downlink control channel (PDCCH), a physical control format indicator channel for transmitting an indicator for distinguishing the PDSCH and PDCCH regions in a new carrier type (NCT).
  • a control channel such as a physical HARQ indicator channel (PHICH) for transmitting an indicator channel (PCFICH) and a hybrid automatic repeat request (HARQ) confirmation for uplink transmission will not be transmitted.
  • PHICH physical HARQ indicator channel
  • PCFICH hybrid automatic repeat request
  • HARQ hybrid automatic repeat request
  • the transmitter 20 transmits a Cell-Specific Reference Signal (CRS), an MBSFN Reference Signal (MBSFN-RS), a UE-Specific Reference Signal in the downlink of the LCT.
  • CRS Cell-Specific Reference Signal
  • MBSFN-RS MBSFN Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • CRS a cell-specific RS
  • DM-RS is a unicast transmission for each UE.
  • a UE-specific reference signal is defined in a band in which a physical downlink shared channel (PDSCH), which is a main physical channel, is transmitted.
  • PDSCH physical downlink shared channel
  • the cell specific reference signal means that the shape of a reference signal (for example, CRS) transmitted to each terminal in the same cell may be the same regardless of the terminal.
  • the UE-specific reference signal (UE specific reference signal) means that the shape of the reference signal (for example, DM-RS) transmitted to each terminal may be different for each terminal.
  • the UE-specific reference signal is a UE in an environment using a precoding scheme in which the transmitter 20 precodes a complex symbol using a precoding matrix before transmitting the complex symbol.
  • DM-RS is a reference signal transmitted for the purpose of supporting the receiving end 10 to learn information about a virtual channel modified by precoding.
  • the DM-RS which is a UE-specific reference signal, is transmitted for a band where each terminal receives a PDSCH, and each terminal receives channel or virtual channel information necessary for PDSCH decoding through the DM-RS reception.
  • one radio frame (radioframe) consists of 10 subframes, and one subframe consists of two slots.
  • the radio frame has a length of 10 ms and the subframe has a length of 1.0 ms.
  • the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis.
  • One slot may have a plurality of OFDM symbols in the time domain and include at least one subcarrier in the frequency domain.
  • one slot contains seven OFDM symbols in the time domain (for Normal Cyclic Prefix or Normal CP) or six (for Extended Cyclic Prefix for Extended CP) and in the frequency domain It may include 12 subcarriers.
  • the time-frequency domain defined as one slot may be referred to as a resource block (RB), but is not limited thereto.
  • the resource element (RE) may consist of one OFDM symbol on the time axis and one subcarrier on the frequency axis.
  • one resource block may include 7 ⁇ 12 resource elements (in case of normal CP) or 6 ⁇ 12 resource elements (in case of extended CP).
  • the transmitter 20 transmits a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) for synchronization with the base station and cell identification.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • an SSS is allocated to at least one specific resource block (RB) in at least one subframe of one radio frame.
  • the transmitter 20 may avoid side effects such as interference with LTE user equipment (UE) and setting of DM-RS (Demodulation Reference Signal) as described below.
  • UE user equipment
  • DM-RS Demodulation Reference Signal
  • the position of the PSS / SSS for the asynchronous NCT which is one of the CCs not including the control region, can be changed on the time (symbol) axis.
  • the transmitter 20 will not transmit a cell-specific reference signal (CRS) in the downlink of the NCT. Instead, the transmitter 20 may transmit a tracking reference signal (TRS).
  • TRS is a kind of reduced CRS transmitted in 5ms period based on the antenna port 0 and Rel.8 sequence of the conventional CRS.
  • the transmitter 20 may transmit a UE-Specific Reference Signal (DM-RS) and a Channel State Information Reference Signal (CSI-RS) in the NCT.
  • DM-RS UE-Specific Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • Figure 3 is a view for explaining the RS and PBCH transmission scheme.
  • one BCH transport block corresponding to the MIB is transmitted once every 40 ms.
  • a 16-bit Cyclic Redundancy Check (CRC) is inserted for one BCH transport block, 1 / 3-bit rate tail biting convolutional coding is performed as channel coding, and coding bits are repeated.
  • CRC Cyclic Redundancy Check
  • QPSK modulation is performed on the BCH transport block scrambled bit by bit.
  • Antenna mapping is then performed for the modulated BCH transport block, demultiplexed and mapped to the first subframe of each frame in four consecutive frames.
  • the PBCH is transmitted on the center 6PRB of the second slot of subframe 0 of each radio frame.
  • CRS a cell-specific RS
  • DM-RS is a unicast transmission for each UE.
  • a UE-specific reference signal is defined in a band in which a physical downlink shared channel (PDSCH), which is a main physical channel, is transmitted.
  • PDSCH physical downlink shared channel
  • the cell specific reference signal means that the shape of a reference signal (for example, CRS) transmitted to each terminal in the same cell may be the same regardless of the terminal.
  • the UE-specific reference signal (UE specific reference signal) means that the shape of the reference signal (for example, DM-RS) transmitted to each terminal may be different for each terminal.
  • the UE-specific reference signal is a UE in an environment using a precoding scheme in which the transmitter 20 precodes a complex symbol using a precoding matrix before transmitting the complex symbol.
  • DM-RS is a reference signal transmitted for the purpose of supporting the receiving end 10 to learn information about a virtual channel modified by precoding.
  • the DM-RS which is a UE-specific reference signal, is transmitted for a band where each terminal receives a PDSCH, and each terminal receives channel or virtual channel information necessary for PDSCH decoding through the DM-RS reception.
  • FIG. 4 is a diagram illustrating a cell access procedure to which an embodiment of the present invention is applied.
  • the UE is not only connected to the system for the first time, but also a plurality of elements merged through a handover for supporting cell reselection and mobility, and carrier aggregation (CA).
  • CA carrier aggregation
  • the cell access procedure is also performed to find synchronization for carriers (Component Carrier (CC), hereinafter referred to as 'CC').
  • CC Component Carrier
  • the cell search process includes PSS detection (S401) and SSS detection (S403) for acquiring frequency and symbol synchronization for a cell, thereby acquiring frame / slot synchronization of the cell and determining a cell ID.
  • this process may be performed in parallel with the PSS / SSS or through another signal (S402).
  • a step (S405) of checking whether the corresponding cell is an NCT or an LCT is performed and the TRS is checked (S407). Accordingly, the RRM measurement (S409) or the PBCH channel demodulation (S411) is performed. Is performed. As described above, when the CRS is not transmitted, PBCH channel demodulation is performed based on the DMRS.
  • PSS / SSS detection and PBCH detection are the basis in the cell access process according to the cell search.
  • the position of the PSS / SSS may be moved on the time axis or DMRS puncturing may be performed.
  • PBCH PBCH estimating a channel based on the DMRS when the DMRS is punctured
  • this may cause a channel estimation error.
  • a channel estimation error may be serious for a terminal moving at a high speed.
  • One way to solve this channel estimation error may be a method of changing the PBCH channel mapping position on the time axis.
  • PBCH transmission patterns according to whether or not to move to another OFDM symbol position and DMRS puncturing and other DMRS patterns in order to avoid collision with DMRS when PSS / SSS is present in the NCT will be described in detail.
  • subframe # 0 the pattern forms in subframe # 0 may appear the same in subframe # 5.
  • 5 and 6 illustrate examples for explaining a PBCH mapping scheme according to an embodiment of the present invention.
  • a DMRS antenna port group (eg, a DMRS antenna port group that uses the same physical resource but distinguishes each other by a code) while maintaining 1920 bits , which is an existing number of encoded bits transmitted on a PBCH (M bit ), remains as it is.
  • the DMRS resource element may be transmitted using only the DMRS antenna port group # 1 (7, 8, 11, 13) and the group # 2 (9, 10, 12, 14).
  • the left subframe of the figure is an example of the PBCH mapping method when the DMRS resource element is transmitted using only the antenna port 7/8, and the right subframe of the figure transmits the DMRS resource element using only the antenna port 9/10.
  • This is an example of a PBCH mapping scheme.
  • DMRS resource elements may be used due to the use of a limited number of DMRS antenna port groups.
  • the position of the PBCH is shifted to another OFDM symbol on the time axis, and is the number of existing coded bits (M bits ) transmitted on the PBCH.
  • M bits existing coded bits
  • the left subframe of the figure is an example of the PBCH mapping method when only the antenna port 7/8 is used for DMRS resource element transmission
  • the right subframe of the figure is the PBCH when only the antenna port 9/10 is used for DMRS resource element transmission. This is an example of a mapping method.
  • DMRS resource elements may be used due to the use of a limited number of DMRS antenna port groups.
  • FIG. 7 is another example for explaining a PBCH mapping scheme according to an embodiment of the present invention.
  • PBCH In a situation where the position of PSS / SSS is not changed in a general CP of FDD, the position of PBCH is shifted to another OFDM symbol on a time axis, and according to the PBCH mapping scheme shown in the left subframe of the figure, PBCH
  • M bits coded bits
  • DMRS resource elements can be transmitted using two DMRS antenna port groups (DMRS antenna ports 7,8,9,10).
  • DMRS antenna ports 7, 8, 9, 10 More DMRS resource elements may be available, which may benefit from channel estimation performance.
  • the number of existing coded bits (M bits ) transmitted on the PBCH is reduced from 1920bit to 1728bit, but can be transmitted on the PBCH by not transmitting the TRS in the subframe in which the PBCH is transmitted.
  • the number of coding bits can be increased. Accordingly, coding performance gain can be obtained on the PBCH channel.
  • 8 is a diagram illustrating another example for explaining a PBCH mapping scheme according to an embodiment of the present invention. 8 shows examples of a case where the position of the PSS / SSS is not changed in the extended CP of the FDD and the position of the PBCH is moved to another OFDM symbol on the time axis.
  • the number of encoded bits transmitted on the PBCH may be increased to 1824 bits through rate matching processing with respect to the existing 1728 bits, thereby optimizing PRSCH mapping based on DMRS.
  • the number of encoded bits transmitted on the PBCH may be increased from the existing 1728 bit to 1920 bits. Therefore, coding performance gain can be obtained on the PBCH channel.
  • FIGS. 9 and 10 correspond to the examples described with reference to FIGS. 5 through 8, in the case of the general CP in the TDD, the location of the PSS / SSS is the existing Rel. 8 is a diagram for describing a method of mapping PBCH in a situation of maintaining the same position as 8.
  • DMRS is punctured as shown in FIG. 9.
  • An example of a PBCH mapping scheme that can be shown.
  • the left subframe of the figure uses all of the DMRS antenna ports, and the number of coding bits can be reduced from the existing 1920 bits to 1536 bits.
  • the number of encoded bits may be reduced from the existing 1920 bits to 1824 bits.
  • the resource element directly below the frequency axis of the resource element used for DMRS transmission in the right subframe of the drawing is a resource element for transmitting DMRS (Rel-10 DMRS ports 9 and 10).
  • the PBCH may be mapped similarly to the right side of the drawing.
  • the left subframe of the figure is an example of a PBCH mapping method in which two antenna port groups are used for DMRS resource element transmission.
  • the number of bits transmitted on the PBCH is reduced from 1920 bits , which is an existing coded bit, to 1728 bits . Since the TRS is not transmitted to the subframe in which the PBCH is transmitted, the number of coding bits that can be transmitted on the PBCH can be increased as compared with the example described with reference to the left subframe of FIG. 9.
  • the right subframe of the figure is an example of a PBCH mapping method in which only antenna ports 7/8 are used for DMRS resource element transmission.
  • the number of bits transmitted on the PBCH is increased from 1920 bits , which is the existing number of encoded bits (M bits ), to 2016 bits . Can be.
  • PRSCH is used for resource element except for resource element through which the corresponding DMRS antenna port 9/10 is used.
  • the PBCH is mapped.
  • FIG. 11 is a diagram illustrating another example for describing a PBCH mapping scheme according to an embodiment of the present invention.
  • FIG. FIG. 11 corresponds to the description of the extended CP of the FDD of FIG. 8, and is an example in which the position of the PSS / SSS is not changed in the TDD.
  • the number of coded bits transmitted on the PBCH can be maintained to be the same through rate matching processing for the existing 1728 bits, thereby optimizing PRSCH mapping based on DMRS.
  • FIG. 12 is a diagram for explaining a DMRS pattern according to another embodiment of the present invention.
  • a DMRS pattern as shown in FIG. 12 may be considered to avoid collision between the PSS / SSS and the DMRS on the NCT in the center 6PRB of subframe 0 in which the PBCH is transmitted in FDD.
  • examples of general and extended CPs are shown.
  • the left subframe of the figure is for a normal CP (each slot is composed of seven symbols), and DMRS is assigned to the third and fourth OFDM symbols of the first and second slots of subframes # 0 and # 5 within each radio frame.
  • An example of transmitting a DMRS resource element using two DMRS antenna port groups is shown.
  • each slot consists of six symbols
  • a DMRS is allocated to the second and third symbols of the first and second slots of subframe # 0 in each radio frame, and one DMRS is assigned.
  • An example of transmitting a DMRS resource element using only an antenna port group is shown.
  • FIG. 13 and 14 illustrate examples for explaining a PBCH mapping scheme according to another embodiment of the present invention.
  • the examples illustrate the general CP of FDD.
  • the position on the time axis of the DMRS may be changed, and accordingly, the position on the time axis of the PBCH may be changed.
  • examples of transmitting DMRS resource elements using only two DMRS antenna port groups are shown.
  • PBCHs are included in the second through fifth symbols of the second slot as the DMRSs are located in the third and fourth symbols of the first and second slots.
  • An example of mapping is shown, and an example in which a PBCH is mapped to second to fifth symbols of a first slot is illustrated in a right subframe of FIG. 13.
  • the number of coding bits that can be transmitted on the PBCH is reduced from the existing 1920bits to 1632bits, while more DMRS resource elements transmitted using two antenna groups can be used, which may have a gain in channel estimation performance.
  • the same as the left and right sub-frames DMRS pattern and its left and right sub-frames in FIG. 13 PBCH mapping position are each in accordance with the, and the number of encoded bits transmitted on the PBCH (M bit) is
  • M bit the number of encoded bits transmitted on the PBCH
  • the number of coding bits that can be transmitted on the PBCH can be increased by reducing the conventional 1920 bits to 1728 bits but not transmitting the TRS in the subframe in which the PBCH is transmitted. Accordingly, coding performance gain can be obtained on the PBCH channel.
  • 15 and 16 illustrate examples for explaining a PBCH mapping scheme according to another embodiment of the present invention. These examples describe the extended CP of FDD.
  • the position on the time axis of the DMRS may be changed, and accordingly, the position on the time axis of the PBCH may be changed.
  • the DMRS resource element may be transmitted using only one DMRS antenna port group.
  • the number of coding bits that can be transmitted on the PBCH is reduced from the existing 1920 bits to 1728 bits.
  • the PBCH mapping scheme of FIG. 16 is a method applicable when the DMRS pattern is changed as shown in the right subframe of FIG. 12.
  • the DMRS PBCH channels may be mapped to neighboring symbols on the left and right sides of an OFDM symbol to which DMRSs are allocated for both the first and second slots to which Ms are allocated.
  • the number of encoded bits M bits transmitted on the PBCH can be maintained at 1920 bits .
  • 17 and 18 are diagrams illustrating other examples for explaining a PBCH mapping scheme according to another embodiment of the present invention and correspond to a case of an extended CP in FDD.
  • DMRS is transmitted in the same pattern as the example described with reference to FIG. 15, and the PBCH mapping scheme is the same, but the TRS may not be transmitted on the subframe in which the PBCH is transmitted. Accordingly, the number of encoded bits that can be transmitted on the PBCH may be maintained at the existing 1920 bits and may increase as compared with 1728 bits according to FIG. 15.
  • FIG. 18 may be configured such that DMRS is transmitted in the same pattern as the example described in FIG. 16 and the PBCH mapping scheme is the same, but TRS is not transmitted on the subframe in which the PBCH is transmitted. Accordingly, the number of coded bits that can be transmitted on the PBCH may increase from 2,920 bits to 2304 bits, and thus, more coding bits than 1728 bits according to FIG. 16 may be transmitted on the PBCH, thereby obtaining additional coding performance gains.
  • the PBCH mapping method according to the examples described with reference to FIGS. 12 to 18 may be similarly applied.
  • 19 is a diagram for explaining a DMRS pattern according to another embodiment of the present invention.
  • a DMRS pattern may be considered.
  • An example of a general CP is illustrated in the left subframe of the figure, but an example of an extended CP is illustrated in the right subframe, but is not limited thereto.
  • the left subframe of the figure shows an example in which DMRS is allocated to the first and second OFDM symbols of the first and second slots of the subframe and transmits a DMRS resource element using two DMRS antenna port groups.
  • the right subframe of the figure shows an example of allocating DMRS to the second and third symbols of the first and second slots of the subframe and transmitting the DMRS resource element using only one antenna group.
  • 20 and 21 are diagrams for describing examples of the PBCH mapping scheme according to another embodiment of the present invention.
  • the examples describe the general CP of the FDD, the extended CP can be similarly applied to the examples described with reference to FIGS. 15 to 18.
  • the position on the time axis of the DMRS may be changed, thereby changing the position on the time axis of the PBCH.
  • examples of transmitting DMRS resource elements using only two antenna groups are shown.
  • the left subframe of FIG. 20 shows an example in which the PBCH is mapped to the first to fourth symbols of the first slot as DMRSs are located in the first and second symbols of the first and second slots.
  • An example in which a PBCH is mapped to first to fourth symbols of a second slot in a frame is shown.
  • the number of coding bits that can be transmitted on the PBCH is reduced from the existing 1920 bits to 1632 bits, while more DMRS resource elements transmitted using two antenna groups can be used, which may have a gain in channel estimation performance.
  • the pattern shown in the right subframe may be efficient for interference cancellation (ICIC) with the control region of the LCT in the adjacent base station.
  • ICIC interference cancellation
  • the same as the left and right sub-frames DMRS pattern and its left and right sub-frames in FIG. 20 PBCH mapping position are each in accordance with the, and the number of encoded bits transmitted on the PBCH (M bit) is
  • M bit the number of encoded bits transmitted on the PBCH
  • the number of coding bits that can be transmitted on the PBCH can be increased by reducing the conventional 1920 bits to 1728 bits but not transmitting the TRS in the subframe in which the PBCH is transmitted. Accordingly, coding performance gain can be obtained on the PBCH channel.
  • the PBCH channel mapping scheme described with reference to FIGS. 13 to 18 may be similarly applied.
  • FIG. 22 is a diagram illustrating still another example of PBCH mapping according to another embodiment of the present invention, in which a position of a PSS / SSS is not changed with respect to a general CP of TDD, and a DMRS resource element is used using two antenna port groups. Examples of transmitting.
  • the number of encoded bits transmitted on the PBCH is reduced from the existing 1920 bits to 1632 bits.
  • the number of encoded bits transmitted on the PBCH may be increased from the existing 1920 bits to 2016 bits. Therefore, coding performance gain can be obtained on the PBCH channel.
  • the PBCH mapping method described with reference to FIGS. 15 to 18 may be similarly applied.
  • FIG. 23 is a diagram illustrating a base station as an apparatus for performing embodiments according to the present invention.
  • the base station 500 includes a receiver 510, a controller 520, and a transmitter 530.
  • the controller 520 controls the overall operation of the base station to perform the operations required to perform the embodiments of the present invention described above with reference to FIGS. 5 to 21.
  • the transmitter 530 and the receiver 510 transmit and receive signals, messages, or data necessary for performing the above-described embodiments of the present invention with the terminal 10.
  • the base station 500 described with reference to FIG. 23 performs a process to be described later through the receiver 510, the controller 520, and the transmitter 530 to allocate DMRS according to embodiments of the present invention, and to map PBCH accordingly.
  • One downlink transmission signal is transmitted to the terminal.
  • FIG. 24 is a diagram for explaining a PBCH transmission method performed by the apparatus of FIG. 23 according to the present invention.
  • the base station 500 scrambles one input BCH transport block (S610).
  • the bits of one BCH transmission bit block b (0),..., B (M bit- 1) determined according to the M bit value are transmitted as input bits to scramble.
  • the number of coding bits (M bits ) transmitted on the PBCH is determined according to the PBCH mapping method described above in the embodiments of the present invention.
  • the determined value is equal to the value E of the final number of bits according to rate matching processing.
  • the base station performs QPSK modulation on the scrambled value (S620). Accordingly, the symbols d (0),..., D (M symb ⁇ 1) are output.
  • y (p) (i) represents the signal for antenna port p
  • the number of antenna ports is 1, one of all possible or some DMRS antenna ports, e.g. 7, 8, 9, or 10 Antenna ports may be used.
  • the number of antenna ports is 2, two antenna ports of all or some possible DMRS antenna ports, for example, 7 and 8, 9 and 10, 7 and 9, etc. may be used.
  • the base station 500 maps resource elements (S640).
  • There is a radio frame which is transmitted over four consecutive radio frame intervals including the radio frame, starting from y (0) and mapped to (k, l) resource elements in order.
  • the PBCH resource element is mapped only to (k, l) resource elements that are not allocated for reference signal transmission, and ascends to index k first in slot X of subframe 0 or subframe 0 for 4 radio frames. It can be mapped in increasing order, then in ascending order for index l, and finally increasing the number of frames.
  • the index k is shown in Equation 2 below.
  • k is the frequency index
  • l is the OFDM symbol index on which the PBCH is transmitted
  • n is the first OFDM symbol index on which the PBCH is transmitted in the subframe in which the PBCH is transmitted or in one slot in the subframe, and is allocated for the reference signal. Resource elements are excluded.
  • the resource element index when the PBCH mapping is not continuous is expressed by Equation 3 below.
  • k is the frequency index
  • l is the OFDM symbol index for the PBCH
  • n is the first OFDM symbol index on which the PBCH is transmitted in a subframe or one slot in the subframe, and the resource element allocated for the reference signal is excluded. do.
  • 25 is a diagram illustrating a terminal as an apparatus for performing embodiments according to the present invention.
  • the terminal 700 includes a receiver 710, a controller 720, and a transmitter 730.
  • the controller 720 controls the overall operation of the terminal 700 to perform an operation necessary to perform the embodiments of the present invention described above with reference to FIGS. 5 to 21.
  • the transmitter 730 and the receiver 710 transmit and receive signals, messages or data necessary for performing the above-described embodiments of the present invention with the base station 20 or 500.
  • the receiver 710 receives a downlink transmission signal from the base station 20 or 500 under the control of the controller 720 to detect the PSS / SSS, and detects a demodulation reference signal (DMRS) based thereon.
  • DMRS demodulation reference signal
  • a physical broadcast channel (PBCH) may be searched for a blind search.
  • the controller 720 may extract a master information block (MIB) through the searched PBCH.
  • MIB master information block
  • Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention.
  • the storage medium of the computer program may include a magnetic recording medium, an optical recording medium, and the like.

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Abstract

La présente invention se rapporte à la transmission d'informations par une station de base comprenant les étapes consistant à : brouiller et effectuer une modulation par déplacement de phase en quadrature (QPSK), un mappage de couche, et un précodage sur un bloc de bits de transmission de canal de diffusion physique (PBCH) comprenant des bits dont le nombre correspond au nombre (Mbit) de bits codés devant être transmis sur un PBCH ; et, y ayant au moins une trame radio ayant l'indice de trame radio nf où nf mod4 = 0 et quatre trames radio consécutives incluant ladite trame radio, mapper chaque bit du bloc de bits de transmission PBCH précodé en augmentant l'indice de fréquence k, l'indice de symbole OFDM, et l'indice de trame radio nf dans l'ordre croissant à partir de la sous-trame No 0 ou d'un emplacement prédéterminé dans la sous-trame No 0 des quatre trames radio, par rapport aux éléments de ressource (k, l) qui n'ont pas été alloués pour la transmission de signaux de référence, parmi les blocs de symboles complexes (y(P)(0),..., et y(P)(Msymb -1)) dans des ports d'antenne respectifs.
PCT/KR2013/011436 2012-12-20 2013-12-11 Terminal, procédé par lequel le terminal reçoit des informations, station de base, et procédé par lequel la station de base transmet des informations Ceased WO2014098401A1 (fr)

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WO2018145531A1 (fr) * 2017-02-10 2018-08-16 维沃移动通信有限公司 Procédé d'envoi d'un groupe de signaux d'accès synchrones, procédé de réception de ce dernier, dispositif et système associés
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US11665712B2 (en) 2017-07-28 2023-05-30 Lg Electronics Inc. Method of transmitting and receiving broadcasting channel and device therefor
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US12289699B2 (en) 2017-08-11 2025-04-29 Telefonaktiebolaget Lm Ericsson (Publ) Method and device for synchronization
US11483788B2 (en) 2017-09-11 2022-10-25 Hytera Communications Corporation Limited Data frame, data sending method and device
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US11223458B2 (en) 2017-10-19 2022-01-11 Beijing Xiaomi Mobile Software Co., Ltd. Method and apparatus for processing physical broadcast channel (PBCH) bandwidth, and base station

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