WO2015046853A1 - Procédé pour émettre-recevoir des informations de système et appareil associé - Google Patents

Procédé pour émettre-recevoir des informations de système et appareil associé Download PDF

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Publication number
WO2015046853A1
WO2015046853A1 PCT/KR2014/008817 KR2014008817W WO2015046853A1 WO 2015046853 A1 WO2015046853 A1 WO 2015046853A1 KR 2014008817 W KR2014008817 W KR 2014008817W WO 2015046853 A1 WO2015046853 A1 WO 2015046853A1
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Prior art keywords
pbch
terminal
system information
transmitted
transmission
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PCT/KR2014/008817
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English (en)
Korean (ko)
Inventor
강승현
최우진
Original Assignee
주식회사 케이티
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR20140067023A external-priority patent/KR20150035675A/ko
Priority claimed from KR1020140100793A external-priority patent/KR20150052766A/ko
Priority claimed from KR1020140107136A external-priority patent/KR20150051305A/ko
Priority claimed from KR1020140125326A external-priority patent/KR20150051311A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Publication of WO2015046853A1 publication Critical patent/WO2015046853A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to a method and apparatus for transmitting and receiving system information, and more particularly, to a method and apparatus for transmitting and receiving a system information channel repeatedly transmitted for a terminal located in enhanced coverage such as an MTC terminal.
  • Machine Type Communication or Machine to Machine (M2M) is communication between devices and things with no or minimal human intervention.
  • Machine may mean an entity that does not require direct human intervention or intervention, and "MTC” may mean a form of data communication that includes one or more such machines.
  • An example of a “machine” may be a smart meter or vending machine equipped with a mobile communication module, and recently, a smartphone that automatically connects to a network and performs communication without user intervention or intervention depending on the location or situation of the user. With the advent of the portable terminal with the MTC function is also considered as a form of machine.
  • the MTC terminal may be installed in a place where the radio environment is worse than that of the general terminal. Therefore, the coverage of the MTC terminal should be improved to 20dB or more compared to the coverage of the general terminal.
  • MIB Master Information Block
  • the present invention provides a method for determining a frame for transmitting a PBCH so that the terminal having extended coverage can receive a master information block (MIB) through a physical broadcast channel (PBCH) allocated to more than four radio frames,
  • MIB master information block
  • PBCH physical broadcast channel
  • the present invention provides a method and apparatus for setting the transmission period in consideration of the transmission period value of the System Information Block (SIB) when periodically transmitting the transmission resources of the PBCH for the terminal located in the enhanced coverage.
  • SIB System Information Block
  • the present invention is transmitted to the coverage-extended terminal without additional downlink control signaling based on at least one or more information of the SIB time-domain resource allocation information and the transmission period setting information of the system information block (SIB) that is intermittently repeatedly transmitted.
  • SIB system information block
  • a method of receiving system information by a terminal located in enhanced coverage in a wireless communication system includes: determining a frame in which a PBCH is transmitted within a physical broadcast channel (PBCH) transmission period; Receiving a signal encoded with control information for a terminal located in the enhanced coverage through the PBCH of the determined frame; And decoding the signal to obtain control information.
  • the present invention also provides a method further comprising determining a PBCH transmission period in which the signal is transmitted among the plurality of PBCH transmission periods when a plurality of PBCH transmission periods exist in the entire system frame.
  • the determining of the PBCH transmission period of the present invention is based on information bits included in the control information obtained by decoding the signal and indicating a PBCH transmission period in which the signal is transmitted among the plurality of PBCH transmission periods. And determining the PBCH transmission period.
  • the determining of the PBCH transmission period of the present invention also includes determining the PBCH transmission period based on the scrambling sequence of the signal.
  • the determining of the frame in which the PBCH is transmitted may include determining the frame in which the PBCH is transmitted based on at least one of a cell ID and the number of frames in which the PBCH is transmitted. It provides a way to.
  • the determining of the frame in which the PBCH is transmitted may include determining a frame in which a downlink signal having a reception strength equal to or greater than a predetermined threshold value is a frame in which the PBCH is transmitted. Provide a method.
  • Another embodiment of the present invention provides a method for transmitting system information to a terminal located in an enhanced coverage area of a base station in a wireless communication system, the method comprising: determining a frame in which a PBCH is transmitted within a physical broadcast channel (PBCH) transmission period; And transmitting a signal encoded with control information for the UE located in the enhanced coverage through the PBCH of the determined frame.
  • PBCH physical broadcast channel
  • the present invention when a plurality of PBCH transmission period in the entire system frame, the control information, characterized in that the information indicating the PBCH transmission period of the signal transmission of the plurality of PBCH transmission period, characterized in that To provide.
  • the present invention provides a method characterized in that, when there are a plurality of PBCH transmission periods in the entire system frame, signals transmitted in different PBCH transmission periods are scrambled by different scrambling sequences.
  • the determining of the frame in which the PBCH is transmitted may include determining the frame in which the PBCH is transmitted based on at least one of a cell ID and the number of frames in which the PBCH is transmitted. It provides a way to.
  • the present invention also provides a method further comprising transmitting a downlink signal of increased transmission strength in a frame in which the PBCH is transmitted.
  • Another embodiment of the present invention is a terminal located in enhanced coverage in a wireless communication system, comprising: a controller for determining a frame in which a PBCH is transmitted within a physical broadcast channel (PBCH) transmission period; And a receiver configured to receive a signal encoded with control information for the terminal located in the enhanced coverage through the PBCH of the determined frame, wherein the controller decodes the signal to obtain control information. do.
  • the present invention also provides a terminal in which a plurality of PBCH transmission periods exist in an entire system frame, and the controller determines a PBCH transmission period in which the signal is transmitted among the plurality of PBCH transmission periods.
  • the control information may include information indicating a PBCH transmission period during which the signal is transmitted among the plurality of PBCH transmission periods, and the control unit transmits the PBCH transmission period based on information indicating the PBCH transmission period. It provides a terminal, characterized in that for determining.
  • the present invention is characterized in that the signal transmitted in different PBCH transmission period is scrambled by different scrambling sequence, the control unit comprises the step of determining the PBCH transmission period based on the scrambling sequence of the signal Provide a terminal.
  • the present invention also provides a terminal, wherein the control unit determines a frame on which the PBCH is transmitted based on at least one of a cell ID and the number of frames on which the PBCH is transmitted.
  • the control unit of the present invention provides a terminal, characterized in that for determining the frame in which the PBCH is transmitted, the frame receiving the downlink signal having a reception strength of more than a predetermined threshold value.
  • a base station for transmitting system information to a terminal located in enhanced coverage in a wireless communication system, comprising: a controller for determining a frame in which a PBCH is transmitted within a PBCH (Physical Broadcast Channel) transmission period; And a transmitter for transmitting a signal encoded with control information for a terminal located in the enhanced coverage through the PBCH of the determined frame.
  • PBCH Physical Broadcast Channel
  • the present invention if a plurality of PBCH transmission period in the entire system frame, the control information base station, characterized in that including the information indicating the PBCH transmission period of the signal transmission of the plurality of PBCH transmission periods To provide.
  • the present invention provides a base station characterized in that when there are a plurality of PBCH transmission periods in the entire system frame, signals transmitted in different PBCH transmission periods are scrambled by different scrambling sequences.
  • the present invention also provides a base station characterized in that the frame in which the PBCH of the present invention is transmitted is determined based on at least one of a cell ID and the number of frames in which the PBCH is transmitted.
  • the transmitter of the present invention provides a base station, characterized in that for transmitting a downlink signal of increased transmission strength in the frame in which the PBCH is transmitted.
  • another embodiment of the present invention is a method of receiving system information by a terminal in a wireless communication system according to an intermittent physical broadcast channel (PBCH) transmission period set using a transmission period of a system information block (SIB).
  • PBCH physical broadcast channel
  • SIB system information block
  • the transmission period of the SIB (System Information Block) of the present invention provides a method characterized in that the period is set for the SIBx (natural number of x> 1) transmission.
  • the transmission period of the SIB is a period T 0 , T 1 ,... Where n SIBx are different from each other.
  • T (n-1) if having a value PBCH repeated transmission period n of each SIBx different period T 0, T 1, ... a
  • T max max (T 0 , T 1 ,..., T (n-1) ) or ⁇ T max (a natural number with ⁇ > 0), which is a multiple of T max .
  • the transmission period of the SIB System Information Block
  • the transmission period of the SIB provides a method characterized in that the period of the SIBx separately configured for the terminal located in the enhanced coverage.
  • the intermittent PBCH transmission period is a multiple of m and a divisor of 1024.
  • the present invention also provides a method for a base station to transmit system information to a terminal in a wireless communication system, comprising: encoding the system information for a terminal located in the enhanced coverage; And transmitting a signal encoded with system information for the terminal through the PBCH according to an intermittent Physical Broadcast Channel (PBCH) transmission period set using a transmission period of a system information block (SIB). to provide.
  • PBCH Physical Broadcast Channel
  • SIB System Information Block
  • the transmission period of the SIB provides a method characterized in that the period is set for the SIBx (natural number of x> 1) transmission.
  • the transmission period of the SIB (System Information Block) is a period T 0 , T 1 ,... Where n SIBx are different from each other.
  • the transmission period of the SIB System Information Block
  • the intermittent PBCH transmission period is a multiple of m and a divisor of 1024.
  • the present invention is a terminal in a wireless communication system
  • the system information for the terminal is encoded through the PBCH according to the intermittent Physical Broadcast Channel (PBCH) transmission period, which is set using the transmission period of the system information block (SIB) Receiving unit for receiving the received signal; And a controller for decoding the received signal to obtain system information.
  • the transmission period of the SIB System Information Block
  • the transmission period of the SIB provides a terminal characterized in that the period is set for the transmission of SIBx (natural number of x> 1).
  • the transmission period of the SIB System Information Block
  • the transmission period of the SIB is a period T 0 , T 1 ,... Where n SIBx are different from each other.
  • the transmission period of the SIB System Information Block
  • the intermittent physical broadcast channel (PBCH) transmission period is a multiple of m and provides a terminal, which is a divisor of 1024.
  • the present invention provides a base station for transmitting system information from a wireless communication system to a terminal, the control unit for encoding the system information for the terminal; And a transmitter configured to transmit a signal encoded with system information for the UE through the PBCH according to an intermittent Physical Broadcast Channel (PBCH) transmission period set using a transmission period of a system information block (SIB). to provide.
  • PBCH Physical Broadcast Channel
  • SIB System Information Block
  • the transmission period of the SIB provides a base station characterized in that the period is set for the SIBx (natural number of x> 1) transmission.
  • the transmission period of the SIB (System Information Block) is a period T 0 , T 1 ,... Where n SIBx are different from each other.
  • T (n-1) if having a value PBCH repeated transmission period n of each SIBx different period T 0, T 1, ... a
  • T max max (T 0 , T 1 ,..., T (n-1) ) or ⁇ T max (a natural number with ⁇ > 0), which is a multiple of T max .
  • SIB system information block
  • the intermittent Physical Broadcast Channel (PBCH) transmission period is a multiple of m and provides a base station, which is a divisor of 1024.
  • the present invention provides a method for a terminal to receive system information in a wireless communication system, the method comprising the steps of: receiving a signal encoded by the system information for the terminal through the physical downlink shared channel (PDSCH) of a fixed one or more resource blocks; And decoding the signal to obtain system information.
  • the fixed one or more resource blocks provide a method characterized in that the six physical resource blocks in the center of the system band.
  • the fixed one or more resource blocks may include one physical resource block in the center of the system band and two physical resource blocks of an index smaller than the physical resource block; Six physical resource blocks consisting of three physical resource blocks of an index larger than this physical resource block, or one physical resource block in the middle and three physical resource blocks of an index smaller than this physical resource block and this physical resource It provides a method characterized in that the six physical resource blocks consisting of two physical resource blocks of the index larger than the block.
  • SIB System Information Block
  • the system information is SIBx (a natural number of x> 1)
  • some of the subframes defined by the SI window may be a subframe # 5, a TDD special subframe, or a predefined subframe.
  • n (where n is an SI message order) have different periods T 0 , T 1 ,... , T (n-1) , the constant period is a different period of each of the n SIBx T 0 , T 1 ,...
  • T max max (T 0, T 1, ..., T (n-1)), or T is ⁇ T max ( ⁇ > 0 is a natural number) is a multiple of max It provides a way to.
  • the SIBx a natural number of x> 1
  • the SIBx is repeatedly received at a predetermined cycle, and the PDCCH is periodically performed before receiving the signal. It further provides a method comprising the step of repeatedly receiving the control information for the SIBx through.
  • n (where n is an SI message order) have different periods T 0 , T 1 ,...
  • a method of transmitting system information from a base station to a terminal in a wireless communication system of the present invention comprising: encoding the system information for a terminal located in the enhanced coverage; And transmitting a signal encoded with system information for the terminal through a physical downlink shared channel (PDSCH) of at least one fixed resource block.
  • PDSCH physical downlink shared channel
  • the fixed one or more resource blocks provide a method characterized in that the six physical resource blocks in the center of the system band.
  • the fixed one or more resource blocks may include one physical resource block in the center of the system band and two physical resource blocks of an index smaller than the physical resource block; Six physical resource blocks consisting of three physical resource blocks of an index larger than this physical resource block, or one physical resource block in the middle and three physical resource blocks of an index smaller than this physical resource block and this physical resource It provides a method characterized in that the six physical resource blocks consisting of two physical resource blocks of the index larger than the block.
  • SIB System Information Block
  • the system information is SIBx (a natural number of x> 1)
  • some of the subframes defined by the SI window may be a subframe # 5, a TDD special subframe, or a predefined subframe.
  • n (where n is an SI message order) have different periods T 0 , T 1 ,... , T (n-1) , the constant period is a different period of each of the n SIBx T 0 , T 1 ,...
  • T max max (T 0, T 1, ..., T (n-1)), or T is ⁇ T max ( ⁇ > 0 is a natural number) is a multiple of max It provides a way to.
  • the SIBx-encoded signal is repeatedly transmitted at a predetermined period and PDCCH is performed at the predetermined period before transmitting the signal. It further provides a method comprising the step of repeatedly transmitting the control information for the SIBx through.
  • n (where n is an SI message order) have different periods T 0 , T 1 ,...
  • a terminal in a wireless communication system of the present invention comprising: a receiver configured to receive a signal encoded with system information for the terminal through a fixed physical downlink shared channel (PDSCH) of at least one resource block; And a controller for decoding the received signal to obtain system information.
  • PDSCH physical downlink shared channel
  • a base station for transmitting system information to a terminal in a wireless communication system of the present invention comprising: a control unit encoding the system information for the terminal; And a transmitter for transmitting a signal encoded with system information for the terminal through a physical downlink shared channel (PDSCH) of at least one fixed resource block.
  • PDSCH physical downlink shared channel
  • a terminal located in enhanced coverage in a wireless communication system can transmit and receive system information.
  • FIG. 1 is a diagram illustrating an example of a wireless communication system to which an embodiment of the present invention is applied.
  • FIG. 2 is a diagram illustrating a configuration of a MIB.
  • FIG. 3 is a diagram illustrating a PBCH coding process.
  • FIG. 4 is a diagram illustrating a resource for transmitting a PBCH.
  • FIG. 5 is a diagram illustrating a resource for transmitting a PBCH for a UE having extended coverage.
  • FIG. 6 is a flowchart illustrating a method of transmitting / receiving a MIB according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a case in which a plurality of PBCH transmission periods exist in an entire frame.
  • FIG. 8 is a diagram illustrating an example of a method of determining a transmission period of a PBCH having a blind decoding success among a plurality of PBCH transmission periods.
  • FIG. 9 is a diagram illustrating another example of a method of determining a transmission period of a PBCH having blind decoding succeeded among a plurality of PBCH transmission periods.
  • FIG. 10 is a flowchart illustrating a method of receiving a MIB of a terminal according to an embodiment of the present invention.
  • FIG. 11 is a flowchart illustrating a MIB transmission method of a base station according to an embodiment of the present invention.
  • FIG. 12 is a block diagram illustrating a configuration of a terminal according to an embodiment of the present invention.
  • FIG. 13 is a block diagram illustrating a configuration of a base station according to an embodiment of the present invention.
  • FIG. 14 illustrates a position at which an SIB is transmitted according to SIB scheduling information transmitted to a terminal through SIB1.
  • FIG. 15 illustrates performing blind decoding on the assumption that PBCH has been repeatedly transmitted for all frames.
  • FIG. 16 illustrates decoding of a coverage-expanded MTC terminal in consideration of a PBCH repeatedly transmitted only for a frame corresponding to a PBCH repetitive transmission period according to an embodiment of the present invention.
  • FIG. 17 illustrates a position where an SIB is transmitted when SIBx scheduling information transmitted to a UE through SIB1 is shown in Table 5.
  • FIG. 18 is a flowchart illustrating a MIB transmission / reception method according to another embodiment of the present invention.
  • FIG. 19 is a flowchart illustrating a method of receiving a MIB of a terminal according to another embodiment of the present invention.
  • FIG. 20 is a flowchart illustrating a MIB transmission method of a base station according to another embodiment of the present invention.
  • 21 is a block diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
  • 22 is a block diagram showing a configuration of a base station according to another embodiment of the present invention.
  • FIG. 23 illustrates a position at which an SIB is transmitted according to the SIB scheduling information of Table 8 transmitted to the UE through SIB1.
  • 24 is a diagram illustrating another example to which another embodiment of the present invention is applied.
  • 25 is a diagram showing another example to which another embodiment of the present invention is applied.
  • 26 is a flowchart illustrating a SIB transmission / reception method according to another embodiment of the present invention.
  • FIG. 27 is a flowchart illustrating a SIB transmission / reception method according to another embodiment of the present invention.
  • FIG. 28 is a block diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
  • 29 is a block diagram showing the configuration of a base station according to another embodiment of the present invention.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement.
  • the MTC terminal may mean a terminal that supports low cost (or low complexity) and coverage enhancement.
  • the MTC terminal may mean a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
  • the MTC terminal may mean a newly defined Release 13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations.
  • the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or UE category / type defined in the existing rel-12 or less, or newly defined rel-13 low cost (or low) that supports low power consumption. complexity) can mean UE category / type.
  • 1 is a diagram illustrating an initial cell access process of a terminal.
  • a wireless communication system includes uplink communication with a user equipment (UE) 10 and a user equipment 10 (eg, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), Physical Random Access CHannel (PRACH), etc.) and downlink communication (e.g., Physical Downlink Shared CHannel (PDSCH), Physical Downlink Control CHannel (PDCCH), Enhanced Physical Downlink Control CHannel (EPDCCH), Physical HARQ Information CHannel) ), A base station (BS) 20 that performs a physical control format information channel (PCFICH), a physical broadcast channel (PBCH), and the like.
  • PCFICH physical control format information channel
  • PBCH physical broadcast channel
  • the terminal 10 is a comprehensive concept of a terminal in wireless communication.
  • a user station (UE) in WCDMA, LTE, HSPA, etc. as well as a mobile station (MS) and user terminal (UT) in GSM It should be interpreted as a concept including a subscriber station (SS), a wireless device, and the like.
  • SS subscriber station
  • a base station 20 or a cell is generally a station that communicates with the terminal 10, and includes a Node-B, an evolved Node-B, a Sector, and a Site. ), BTS (Base Transceiver System), access point (Access Point), relay node (Relay Node) can be called other terms.
  • BTS Base Transceiver System
  • Access Point Access Point
  • Relay Node relay node
  • the base station 20 should be interpreted in a comprehensive sense, indicating some areas or functions covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like. It is meant to cover various coverage areas such as macro cell, micro cell, pico cell, femto cell, radio resource head (RRH) and relay node communication range.
  • BSC base station controller
  • RRH radio resource head
  • the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station.
  • the base station may indicate the radio area itself to receive or transmit a signal from a viewpoint of a user terminal or a neighboring base station.
  • megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.
  • the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
  • the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
  • the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
  • the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
  • the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.
  • the uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like.
  • Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
  • EPDCCH enhanced PDCCH
  • extended PDCCH extended PDCCH
  • a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
  • antenna transmission system a cooperative multi-cell communication system.
  • the CoMP system may include at least two multiple transmission / reception points and terminals.
  • the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • an eNB a base station or a macro cell
  • a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
  • uplink refers to a communication or communication path from a terminal to multiple transmission / reception points.
  • a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be expressed in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.
  • a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.
  • the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
  • the EPDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the EPDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.
  • high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.
  • the base station 20 performs downlink transmission to the terminals.
  • the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
  • PUSCH physical uplink shared channel
  • the base station 20 may be referred to as a transmission point (TP) in terms of transmitting downlink communication to the terminal 10, and a reception point in view of receiving uplink communication from the terminal 10. , RP), or may be called a Point or a Transmission and Reception Point.
  • TP transmission point
  • RP reception point
  • Point Transmission and Reception Point
  • the terminal 10 receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), which are synchronization signals transmitted from the base station 20 (S102).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PSS may be transmitted in the last symbol (#n) of the first slot of subframe # 0 and subframe # 5 in one radio frame (10ms)
  • SSS is # 0 and sub It can be transmitted in the previous symbol (# n-1) of the last symbol (#n) of the first slot of the frame # 5.
  • PSS / SSS may be transmitted to a location different from FDD.
  • SSS secondary sync signal
  • the terminal 10 may acquire cell ID and downlink synchronization information, and a cell-specific reference signal (CRS) based on the information obtained based on the PSS / SSS. ) Can perform additional synchronization and existing control channel decoding.
  • CRS cell-specific reference signal
  • the terminal 10 receives a signal from the base station 20 through the PBCH based on the CRS (S104), and extracts a MIB (Master Information Block) transmitted through the PBCH (S106).
  • the MIB may include information indicating a cell bandwidth, information indicating a PHICH configuration, and information indicating a system frame number.
  • the terminal 10 can know the resource to which the PDCCH is allocated based on the information included in the MIB.
  • the terminal 10 receives a signal from the base station 20 through the PDCCH based on the CRS (S108), and extracts downlink control information (DCI) transmitted through the PDCCH (S110).
  • DCI may be control information for a PDSCH through which a System Information Block (SIB) is transmitted, and may be delivered through a common search space. In other words, it decodes the PCFICH and detects how many symbols have been allocated for the PDCCH.
  • SIB1 is decoded from this PDCCH. Decode SIB1 and get time domain scheduling information for other SIBs.
  • the terminal 10 receives a signal from the base station through a PDSCH based on DL (Downlink) RS based on the DCI (S112), and extracts the SIB transmitted through the PDSCH (S114). Decode DCI for SIBs other than SIB1 from the PDCCH. Decode other SIBs.
  • the terminal 10 and the base station 20 perform a random access procedure (S116), and the terminal 10 may be in an RRC connected state from an RRC idle state.
  • the MIB may include a 'dl-Bandwidth' field (BW), a 'phich-Config' field, a 'systemFrameNumber' (or 'SFN') field, and a 'spare' field.
  • BW 'dl-Bandwidth' field
  • 'phich-Config' field a 'phich-Config' field
  • 'systemFrameNumber' or 'SFN'
  • the 'dl-Bandwidth' field may be used to indicate the bandwidth of the cell in units of resource blocks (RBs).
  • RBs resource blocks
  • one cell may be configured with 6, 15, 25, 50, 75, or 100 RBs, and a 3-bit 'dl-Bandwidth' field indicates a value of one of them. Can be used for
  • the 'phich-Config' field may be used to indicate a resource of a PHICH in which Acknowledgment / Negative Acknowledgement (A / N) for a PUSCH is transmitted.
  • the 'phich-Config' field is composed of 3 bits and may include 1 bit for indicating a PHICH duration and 2 bits for indicating a PHICH resource.
  • the PHICH duration may indicate the number of Orthogonal Frequency Division Multiplex (OFDM) symbols to which the PHICH is allocated, and when the value of the PHICH duration is 0 (Normal), the PHICH may be located in the first 1 OFDM symbol of the subframe, If 1, the PHICH may be located in the first two or three OFDM symbols of the subframe.
  • the PHICH resource may indicate a resource occupancy amount of the PHICH and may indicate a value of 1/6, 1/2, 1, or 2.
  • the 10-bit 'spare' field is reserved.
  • the terminal 10 Since the PDCCH is mapped to a region excluding the PCFICH and the PHICH in the control region, the terminal 10 receiving the information on the resource to which the PHICH is allocated through the MIB can know the resource to which the PDCCH is allocated.
  • the MIB consists of all 24 bits, and undergoes the coding process as shown in FIG. 3 for PBCH transmission.
  • FIG. 3 shows a coding process of a PBCH at a base station.
  • a 16-bit cyclic redundancy check is generated using MIB 24 bits (a 0 , a 1 ,..., A A-1 ).
  • the generated 16-bit CRC is scrambled with a 16-bit CRC mask set according to the number of transmit antennas.
  • a scrambled CRC of 16 bits is added after the MIB of 24 bits to generate a total of 40 bits of information bit blocks (i 0 , i 1 , ... i K-1 ) (S310).
  • the 40-bit information bits are encoded using a tail biting convolutional code (TBCC) (S320).
  • TBCC coded mother code words ( ) Is 120 bits long.
  • the mother code is repeated with a 1920 bit codeword (e 0 , e 1 , ..., e E-1 ) through a rate matching process (S330).
  • FIG. 4 illustrates resources for which a PBCH is transmitted.
  • the PBCH may be located in the first subframe of each frame on the time axis and in 6 resource blocks (RBs) or 72 subcarriers on the frequency axis.
  • the 1920-bit codeword is transmitted in four frames of 480 bits in the first subframe of each frame.
  • a codeword of 480 bits transmitted for each frame is composed of a codeword that can be decoded.
  • the UE may decode the received value of the codewords transmitted in the corresponding period. If the channel condition between the base station and the channel is good, the terminal can successfully decode using the received value of the codeword transmitted in one frame. Otherwise, the terminal combines the received values of the codeword transmitted in up to four frames. By doing so, the probability of success or success in decryption increases.
  • Machine Type Communication is defined as communication between devices and things without human intervention.
  • machine means an entity that does not require human intervention or intervention
  • MTC is defined as a form of data communication in which one or more such machines are included.
  • a machine a form of a smart meter or vending machine equipped with a mobile communication module has been mentioned, but recently, a smartphone that automatically connects to a network and performs communication without user intervention or intervention according to a user's location or situation. With the advent of the portable terminal with the MTC function is also considered as a form of machine.
  • the main standard items related to physical layer specification change currently being discussed in 3GPP may include technologies such as narrowband support, single RF chain, half duplex FDD, and long DRX (Discontinued Reception).
  • technologies such as narrowband support, single RF chain, half duplex FDD, and long DRX (Discontinued Reception).
  • the above methods which are considered to lower the price, may reduce the performance of the MTC terminal compared to the conventional LTE terminal.
  • the coverage of LTE MTC terminals is compared with that of conventional LTE terminals for successful MTC data transmission. 20dB should be improved. In addition, if the performance reduction due to the specification change is further considered, the coverage of the LTE MTC terminal should be improved by 20 dB or more.
  • the requirements of the LTE-based low-cost MTC terminal is as follows.
  • the data rate is the data rate provided by the MTC terminal based on the minimum EGPRS, that is, downward
  • the service area provided shall not be smaller than that provided by the GSM / EGPRS MTC terminal.
  • ⁇ Power consumption should not be greater than GSM / EGPRS MTC terminal.
  • Legacy LTE terminal and LTE MTC terminal must be available in the same frequency.
  • ⁇ Optimization is performed not only in the FDD mode but also in the TDD mode.
  • Low-cost LTE MTC terminals must support limited mobility and low power consumption modules.
  • the PBCH is the first channel for transmitting system information of the base station, and if the terminal does not properly receive the PBCH data, it will not be able to receive any downlink data in the future.
  • the coverage of the PBCH must also be extended.
  • 3GPP TR 36.888 describes a method for improving PBCH coverage as follows.
  • Repetition alone may not meet the coverage target for the current PBCH where the MIB change varies every 40 ms with SFN update (eg many repetitions such as 26-95 of the current PBCH in a radio frame).
  • the new design may consider technologies such as long periods, reduced legacy MIB content, and intermediate delivery. Repetition and / or PSD boosting can help new designs to meet coverage goals.
  • Another low rate coding scheme or spreading may be considered for the new design.
  • -A new design can consider techniques such as: a longer period, reduced legacy MIB content, intermittent transmission. Repetitions and / or PSD boosting may be helpful for new design in order to meet the coverage target.
  • Complementary PBCH decoding techniques eg, correlation decoder or reduced search space decoder.
  • the coverage target for PBCH according to section 9.2 of this TR is 11.7 dB for FDD and 17.7 dB for TDD.
  • a complementary PBCH decoding technique e.g., correlation decoder or reduced search space decoder.
  • the coverage target for PBCH according to subclause 9.2 of this TR is 11.7 dB for FDD and 17.7 dB for TDD.
  • the UE combines only the reception values of the PBCH codewords transmitted within four frames, which are PBCH transmission periods, and cannot receive the reception values of the codewords transmitted in other PBCH transmission periods.
  • the base station In order for the coverage-expanded MTC terminal to receive the PBCH and succeed in blind decoding, the base station should transmit the PBCH repetitively transmitted 36 to 95 times.
  • FIG. 5 is a diagram illustrating a resource for transmitting a PBCH for a UE having extended coverage.
  • a PBCH codeword transmitted using four subframes over four conventional frames must be repeatedly transmitted using 144 to 384 subframes.
  • FDD Frequency Division Duplex
  • one frame is composed of 10 subframes and all subframes present in one frame are used for PBCH transmission
  • 15 to 39 frames are used for PBCH transmission for an MTC terminal having extended coverage. Should be.
  • TDD since the number of downlink subframes in one frame is less than 10, the number of frames required for PBCH transmission for the coverage-expanded MTC terminal increases according to the TDD configuration.
  • the transmission resources allocated to other terminals existing in the same cell are relatively reduced.
  • the coverage-extended MTC terminal also reduces the transmission resources that can be allocated for other physical channels other than the PBCH.
  • An embodiment of the present invention is a method for transmitting a PBCH for a coverage-enhanced MTC terminal, and more specifically, a method for determining a frame for transmitting a PBCH for the MTC coverage, MTC terminal, a method for configuring the information bits transmitted to the PBCH,
  • the present invention proposes a method for obtaining an SFN by receiving a PBCH.
  • the present invention proposes a method of transmitting a PBCH for coverage-enhanced MTC terminal.
  • the PBCH transmitted for coverage-enhanced MTC terminal is referred to as CE-MTC-PBCH.
  • FIG. 6 is a flowchart illustrating a method of transmitting / receiving a MIB according to an embodiment of the present invention.
  • the UE Before receiving the PBCH, the UE receives the PSS and the SSS, synchronizes with the base station in time, and acquires a Cell ID of the base station (S610).
  • transmission subframe numbers or slot numbers of the PSS and the SSS are different and fixed according to FDD or TDD. Accordingly, if the UE successfully detects the PSS and the SSS, the terminal acquires the transmission timing (or frame boundary) of subframe 0, in addition to the duplex scheme.
  • the base station and the terminal may determine a frame used for CE-MTC-PBCH transmission using the Cell ID (S620). More specifically, the CE-MTC-PBCH may be transmitted with a certain transmission period, and a frame in which the CE-MTC-PBCH is transmitted may be determined according to the Cell ID within one transmission period.
  • the frame on which the CE-MTC-PBCH is transmitted may be expressed using a system frame number (SFN).
  • SFN system frame number
  • the SFN has a value of 0 to 1023 and the SFN has a value repeated from 0 to 1023 in 1024 frame periods.
  • the base station selects N SFN i 0 , i 1 ,... As a function of Cell ID. , i (N-1) can be selected and the CE-MTC-PBCH can be transmitted through the selected N frames.
  • the base station may select a specific SFN i as a function of Cell ID and transmit CE-MTC-PBCH through N consecutive frames from SFN i to SFN i + (N-1). .
  • the transmission period of the CE-MTC-PBCH and the number N of frames required for the CE-MTC-PBCH transmission may use values promised by the base station and the terminal.
  • the base station transmits the CE-MTC-PBCH through the frame determined by the terminal (S630).
  • the terminal first decodes the conventional PBCH (S640). In this case, even when the PBCH transmitted over the conventional four frames is soft-combined and blind decoded, the UE determines that it is in extended coverage and decodes the CE-MTC-PBCH (S650). . The UE soft combines and blind decodes the received value of the CE-MTC-PBCH transmitted through the previous N frames, starting with the frame receiving the CE-MTC-PBCH. If the blind decoding is successful, the SFN of the base station may be obtained by combining the frame position in which the CE-MTC-PBCH is transmitted, the Cell ID, and the information bits transmitted in the CE-MTC-PBCH (S660).
  • FIG. 7 is a diagram illustrating a case in which a plurality of PBCH transmission periods exist in an entire frame.
  • a transmission period of CE-MTC-PBCH is 512 frames
  • a Cell ID is 200
  • 40 frames are used for CE-MTC-PBCH transmission.
  • the UE cannot distinguish transmission periods between the two CE-MTC-PBCHs, even if the blind decoding of the CE-MTC-PBCH succeeds, the UE cannot determine the transmission period of the last frame in which the CE-MTC-PBCH is transmitted. It is not known whether the SFN is 239 or 751. Therefore, the exact SFN of the base station cannot be obtained.
  • the base station transmits the plurality of CE-MTC-PBCH transmission periods to the UE through the CE-MTC-PBCH information bit. It can be transmitted including the information bits to distinguish the (S810).
  • the UE performs blind decoding of the CE-MTC-PBCH (S820), and when the blind decoding is successful, the UE may distinguish the plurality of CE-MTC-PBCH transmission periods included in the CE-MTC-PBCH information bit.
  • the information bits are extracted (S830), and the SFN is determined based on the extracted information bits (S840). For example, in the example of FIG.
  • the SFN is determined to be 239 when blind decoding succeeds, and the information bits have two CEs.
  • the SFN may be determined to be 751 when the blind decoding succeeds.
  • the base station when there are a plurality of CE-MTC-PBCH transmission periods in SFN 0 to 1023, the base station different scrambling sequences for CE-MTC-PBCH transmitted in different transmission periods to the UE. Can be transmitted using (S910).
  • the UE performs blind decoding of the CE-MTC-PBCH (S920).
  • the UE determines the CE-MTC-PBCH transmission period when the blind decoding is successful among the plurality of CE-MTC-PBCH transmission periods based on the scrambling sequence of the CE-MTC-PBCH (S930), and based on the SFN Determine (S940).
  • S930 the scrambling sequence of the CE-MTC-PBCH
  • the SFN is determined to be 239 at the time of blind success, and the two based on the scrambling sequence.
  • the SFN may be determined to be 751 when blind decoding succeeds.
  • all base stations may use a fixed value instead of their Cell ID.
  • Power boosting on downlink signals such as PBCH (CE-MTC-PBCH or conventional PBCH), DL RS (Downlink Reference Signal), PSS, SSS, which are transmitted together in a frame in which the base station transmits CE-MTC-PBCH )
  • PSD may be transmitted by boosting power spectral density (PSD).
  • the UE measures the reception strength of the downlink signal, for example, RSRP (Reference Signal Received Power) or RSSI (Received Signal Strength Indication) for a certain frame, and transmits the CE-MTC-PBCH when it exceeds a certain threshold. Can be predicted by the frame.
  • RSRP Reference Signal Received Power
  • RSSI Received Signal Strength Indication
  • the base station may secure transmission resources allocated to other terminals by adjusting the transmission resources of the PBCH transmitted for the coverage-expanded MTC terminal.
  • the SFN of the frame to which the PBCH transmission resource is proposed in the embodiment of the present invention is determined as a function of the cell ID, the amount of PBCH information bits that the UE should find by blind decoding can be reduced. In other words, it is possible to reduce the amount of information bits that the base station uses for the PBCH to transmit SFN information and to enable more robust PBCH transmission for limited transmission resources.
  • FIG. 10 is a flowchart illustrating a method of receiving a MIB of a terminal according to an embodiment of the present invention.
  • the UE before receiving a PBCH, the UE receives a PSS and an SSS, synchronizes with the base station in time, and acquires a Cell ID of the base station (S1010).
  • transmission subframe numbers or slot numbers of the PSS and the SSS are different and fixed according to FDD or TDD. Accordingly, if the UE successfully detects the PSS and the SSS, the terminal acquires the transmission timing (or frame boundary) of subframe 0, in addition to the duplex scheme.
  • the UE may determine a frame used for CE-MTC-PBCH transmission using the Cell ID (S1020). More specifically, the CE-MTC-PBCH may be transmitted with a certain transmission period, and a frame in which the CE-MTC-PBCH is transmitted may be determined according to the Cell ID within one transmission period.
  • the frame on which the CE-MTC-PBCH is transmitted may be expressed using a system frame number (SFN).
  • SFN system frame number
  • the SFN has a value of 0 to 1023 and the SFN has a value repeated from 0 to 1023 in 1024 frame periods.
  • the base station selects N SFN i 0 , i 1 ,... As a function of Cell ID. , i (N-1) can be selected and the CE-MTC-PBCH can be transmitted through the selected N frames.
  • the base station may select a specific SFN i as a function of Cell ID and transmit CE-MTC-PBCH through N consecutive frames from SFN i to SFN i + (N-1). .
  • the transmission period of the CE-MTC-PBCH and the number N of frames required for the CE-MTC-PBCH transmission may use values promised by the base station and the terminal.
  • the terminal receives the CE-MTC-PBCH through the determined frame (S1030).
  • the terminal first decodes the conventional PBCH (S1040). In this case, even when the PBCH transmitted over the conventional four frames is soft combined and blind decoded, the UE determines that the UE is in extended coverage and receives the CE-MTC-PBCH. The UE soft combines and blind decodes the received value of the CE-MTC-PBCH transmitted through the previous N frames, starting with the frame receiving the CE-MTC-PBCH (S1050). If the blind decoding is successful, the SFN of the base station may be obtained by combining the frame position in which the CE-MTC-PBCH is transmitted, the Cell ID, and the information bits transmitted in the CE-MTC-PBCH (S1060).
  • the UE blinds based on information bits that can distinguish the plurality of CE-MTC-PBCH transmission periods included in the CE-MTC-PBCH information bits.
  • the CE-MTC-PBCH transmission period when the decoding succeeds may be determined, and the SFN may be determined based on this.
  • the UE may determine the CE-MTC-PBCH transmission period when the blind decoding succeeds based on the scrambling sequence, and determine the SFN based on the scrambling sequence.
  • FIG. 11 is a flowchart illustrating a MIB transmission method of a base station according to an embodiment of the present invention.
  • the base station transmits the PSS and the SSS to the terminal (S1110).
  • the terminal receiving the PSS and the SSS may synchronize with the base station in time and obtain a Cell ID of the base station.
  • transmission subframe numbers or slot numbers of the PSS and the SSS are different and fixed according to FDD or TDD. Accordingly, if the UE successfully detects the PSS and the SSS, the UE may acquire transmission timing (or frame boundary) of subframe 0, in addition to the duplex scheme.
  • the base station may determine a frame used for CE-MTC-PBCH transmission using the Cell ID (S1120). More specifically, the CE-MTC-PBCH may be transmitted with a certain transmission period, and a frame in which the CE-MTC-PBCH is transmitted may be determined according to the Cell ID within one transmission period.
  • the frame on which the CE-MTC-PBCH is transmitted may be expressed using a system frame number (SFN).
  • SFN system frame number
  • the SFN has a value of 0 to 1023 and the SFN has a value repeated from 0 to 1023 in 1024 frame periods.
  • the base station selects N SFN i 0 , i 1 ,... As a function of Cell ID. , i (N-1) can be selected and the CE-MTC-PBCH can be transmitted through the selected N frames.
  • the base station may select a specific SFN i as a function of Cell ID and transmit CE-MTC-PBCH through N consecutive frames from SFN i to SFN i + (N-1). .
  • the transmission period of the CE-MTC-PBCH and the number N of frames required for the CE-MTC-PBCH transmission may use values promised by the base station and the terminal.
  • the base station transmits the CE-MTC-PBCH through the frame determined by the terminal (S1130).
  • the base station may include information bits for distinguishing the plurality of CE-MTC-PBCH transmission periods into the CE-MTC-PBCH information bits.
  • the base station may transmit the PBCH using different scrambling sequences for different CE-MTC-PBCH transmission periods.
  • FIG. 12 is a block diagram illustrating a configuration of a terminal according to an embodiment of the present invention.
  • the base station 1200 may include a controller 1210, a transmitter 1220, and a receiver 1230.
  • the controller 1210 controls the overall operation of the terminal for performing the above-described embodiment.
  • the transmitter 1220 and the receiver 1230 may transmit / receive signals, messages, data, and the like necessary for performing the above-described embodiments with the base station.
  • the receiver 1230 may receive the PSS and the SSS, and the controller 1210 may synchronize time with the base station based on the received PSS and the SSS and acquire a Cell ID of the base station. In addition, the controller 1210 may acquire a transmission timing (or frame boundary) of subframe 0.
  • the controller 1210 may determine a frame used for CE-MTC-PBCH transmission using the Cell ID. More specifically, the CE-MTC-PBCH may be transmitted with a certain transmission period, and a frame in which the CE-MTC-PBCH is transmitted may be determined according to the Cell ID within one transmission period.
  • the frame on which the CE-MTC-PBCH is transmitted may be expressed using a system frame number (SFN).
  • SFN system frame number
  • the SFN has a value of 0 to 1023 and the SFN has a value repeated from 0 to 1023 in 1024 frame periods.
  • the base station selects N SFN i 0 , i 1 ,... As a function of Cell ID. , i (N-1) can be selected and the CE-MTC-PBCH can be transmitted through the selected N frames.
  • the base station may select a specific SFN i as a function of Cell ID and transmit CE-MTC-PBCH through N consecutive frames from SFN i to SFN i + (N-1). .
  • the receiver 1230 may receive the CE-MTC-PBCH through the determined frame.
  • the controller 1210 may first decode the conventional PBCH. In this case, even when the PBCH transmitted over the conventional four frames is soft-combined and blind decoded, the controller 1210 may determine that the terminal is in extended coverage. The controller 1210 may soft combine and blind decode a received value of the CE-MTC-PBCH transmitted through the previous N frames, starting with the frame receiving the CE-MTC-PBCH. If the blind decoding is successful, the controller 1210 may acquire the SFN of the base station by combining the frame position in which the CE-MTC-PBCH is transmitted, the Cell ID, and the information bits transmitted in the CE-MTC-PBCH.
  • the control unit 1210 is in an information bit that can distinguish the plurality of CE-MTC-PBCH transmission periods included in the CE-MTC-PBCH information bits.
  • the CE-MTC-PBCH transmission period at the time of blind decoding success may be determined, and the SFN may be determined based on this.
  • the controller 1210 may determine the CE-MTC-PBCH transmission period when the blind decoding succeeds based on the scrambling sequence, and determine the SFN based on the scrambling sequence.
  • FIG. 13 is a block diagram illustrating a configuration of a base station according to an embodiment of the present invention.
  • the base station 1300 may include a controller 1310, a transmitter 1320, and a receiver 1330.
  • the controller 1310 controls the overall operation of the base station for performing the above-described embodiment.
  • the transmitter 1320 and the receiver 1330 may transmit and receive signals, messages, data, and the like, necessary for performing the above-described embodiment.
  • the transmitter 1320 may transmit the PSS and the SSS to the terminal.
  • the terminal receiving the PSS and the SSS may synchronize with the base station in time and obtain a Cell ID of the base station.
  • transmission subframe numbers or slot numbers of the PSS and the SSS are different and fixed according to FDD or TDD. Accordingly, if the UE successfully detects the PSS and the SSS, the UE may acquire transmission timing (or frame boundary) of subframe 0, in addition to the duplex scheme.
  • the controller 1310 may determine a frame used for CE-MTC-PBCH transmission using the Cell ID. More specifically, the CE-MTC-PBCH may be transmitted with a certain transmission period, and a frame in which the CE-MTC-PBCH is transmitted may be determined according to the Cell ID within one transmission period.
  • the frame on which the CE-MTC-PBCH is transmitted may be expressed using a system frame number (SFN).
  • SFN system frame number
  • the SFN has a value of 0 to 1023 and the SFN has a value repeated from 0 to 1023 in 1024 frame periods.
  • the base station selects N SFN i 0 , i 1 ,... As a function of Cell ID. , i (N-1) can be selected and the CE-MTC-PBCH can be transmitted through the selected N frames.
  • the base station may select a specific SFN i as a function of Cell ID and transmit CE-MTC-PBCH through N consecutive frames from SFN i to SFN i + (N-1). .
  • the transmitter 1320 may transmit the CE-MTC-PBCH through the frame determined by the terminal.
  • the base station 1300 may include information bits for distinguishing the plurality of CE-MTC-PBCH transmission periods into the CE-MTC-PBCH information bits. Can be.
  • the base station 1300 may transmit the PBCH using different scrambling sequences for different CE-MTC-PBCH transmission periods.
  • SIB system information block
  • System Information Block Type 2 (SIB2) which includes common and sharedchannel information.
  • SIB9 which is used to signal the name of a Home eNodeB (HeNBs).
  • SIB10-SIB12 which include the Earthquake and Tsunami Warning Service (ETWS) notifications and Commercial Mobile Alert System (CMAS) warning messages SIB13, which includes MBMS related control information SIB14, which contains Extended Access Barring related information.
  • SIB15 which contains the MBMS Service Area Identities (SAI) of the current and / or neighboring carrier frequencies.
  • SIB16 which contains information related to GPS time and Coordinated Universal Time (UTC).
  • SIB1 uses fixed time domain scheduling similar to MIB.
  • the UE decodes the frequency domain scheduling information of the PDSCH through which SIB1 is transmitted by decoding the DCI of the PDCCH transmitted through SF # 5. The UE blindly decodes the DCI using the SI-RNTI.
  • SIB2 to SIB16 The time domain scheduling information information of another SIB described above is transmitted to the terminal through SIB1.
  • the reception is repeated in the next SI window for the associated SI message.
  • the UE decodes the frequency domain scheduling information for SIB2 to SIB16 transmitted in the SI window by decoding the DCI of the PDCCH transmitted together in the subframe in which the corresponding SIB is transmitted.
  • SIB1 informs the UE of the time domain scheduling information through the SI window w
  • subframe information through which the SIB2 to SIB16 are transmitted can be obtained only when the UE successfully decodes the DCI.
  • the si-Periodicity T value is set to one of 8, 16, 32, 64, 128, 256, and 512 with the same value for each SIB (SIB2 to SIB16) or for a plurality of SIBs, and the si-Periodicity T The value means the number of frames.
  • the location where the SIB is transmitted is as shown in FIG.
  • the UE combines only the reception values of the PBCH codewords transmitted in four frames, which are PBCH transmission periods, and cannot combine the reception values of the codewords transmitted in other PBCH transmission periods.
  • the base station In order for the coverage-expanded MTC terminal to receive the PBCH and succeed in blind decoding, the base station must repeatedly transmit the PBCH transmitted 36 to 95 times. In other words, the PBCH codeword transmitted in four subframes over four conventional frames must be repeatedly transmitted using 144 to 384 subframes. In case of FDD, assuming that one frame is composed of 10 subframes and all subframes existing in one frame are used for PBCH transmission, 15 to 39 frames are used for PBCH transmission for an MTC terminal having extended coverage. Should be.
  • the coverage-extended MTC terminal may also reduce the transmission resources that can be allocated for other physical channels other than the PBCH.
  • the SIB must be transmitted in a plurality of subframes as follows to support the coverage-extended MTC terminal.
  • SIB1 For PDSCH transmission of SIB1, if it is assumed that the sizes of the SIBs are 152 bits or less and one receiving antenna is assumed, 80 repetitive transmissions (3dB pilot boosting) or 120 repetitive transmissions (no pilot boosting) This is required to improve 15dB. For larger SIBs greater than 208 bits, 110 repeats (3dB pilot boosting) or 160 repeats (no pilot boosting) are required.
  • PDSCH transmission resources for DTCH Dedicated Traffic Channel
  • the system information is repeatedly transmitted for the terminal intermittently extended coverage only for a specific transmission period, and the system information is transmitted in the same manner as the conventional method except the specific system information transmission period.
  • This is called an intermittent system information repetitive transmission method or an intermittent PBCH repetitive transmission method.
  • the present invention provides a method and apparatus for setting a period of intermittent PBCH repetitive transmission when an eNB intermittently transmits PBCH repeatedly for a coverage-expanded MTC terminal.
  • the UE acquires the SFN used by the base station after receiving the MIB transmitted through the PBCH.
  • the PBCH transmitted through four frames must be blind decoded.
  • the PBCH is also blindly decoded.
  • the MTC terminal having the extended coverage cannot know which frame the PBCH is repeatedly transmitted, and performs blind decoding on the assumption that the PBCH is repeatedly transmitted for all frames.
  • the coverage-expanded MTC terminal If the coverage-expanded MTC terminal succeeds in PBCH blind decoding in a PBCH repeated transmission frame, the coverage-expanded MTC terminal obtains an SFN. At this time, if the coverage-extended MTC UE does not know the PBCH repetition transmission period even after acquiring the SFN, PBCH decoding (no longer blind decoding) is performed in consideration of PBCH repetition transmission every frame.
  • the base station and the MTC terminal should be aware of the period of intermittent PBCH repetitive transmission promised to each other, and the coverage-expanded MTC terminal may retransmit the PBCH repetitively transmitted only for the frame corresponding to the PBCH repetitive transmission period.
  • the coverage-expanded MTC terminal may retransmit the PBCH repetitively transmitted only for the frame corresponding to the PBCH repetitive transmission period.
  • the periodic value of the intermittent PBCH repetitive transmission may have a predetermined periodic value or a method in which the base station sets the periodic value and informs the terminal.
  • the base station and the terminal has a predetermined interval value of the intermittent PBCH repetitive transmission
  • the setting of the period value P of the intermittent PBCH repetitive transmission, the PBCH repetitive transmission method of the base station in consideration of this, and the PBCH receiving method of the coverage-extended MTC terminal will be described. do.
  • the base station may arbitrarily define the x value and repeatedly transmit the PBCH.
  • the coverage-extended MTC terminal may blindly decode the repeatedly transmitted PBCH, and if successful, may acquire the SFN value of the MIB. After that, the extended MTC terminal recognizes that the PBCH is repeatedly transmitted after P frames and decodes the PBCH repeatedly transmitted in the corresponding frame.
  • the base station may arbitrarily define the x value and repeatedly transmit the PBCH.
  • the coverage-extended MTC terminal may blindly decode the repeatedly transmitted PBCH, and if successful, may acquire the SFN value of the MIB. After that, the extended MTC terminal recognizes that the PBCH is repeatedly transmitted after P frames and decodes the PBCH repeatedly transmitted in the corresponding frame.
  • the base station may set the period of intermittent PBCH repetitive transmission using a period (si-Periodicity) T value set for SIBx (here, x> 1 natural number) transmission.
  • the SIBx must also be repeatedly transmitted.
  • transmission resources used for PBCH repetitive transmission and transmission resources for transmitting SIBx should be shared. In this way, it is possible to set the shared transmission resource to use repeated transmission of the PBCH and SIBx at different times.
  • the SIBx may be periodically transmitted using the si-Periodicity T value, and a relatively short time is allocated to the window length si-WindowLength w as compared to the period T value.
  • the base station sets the T max value so that PBCH, SIB1, and other SIBs can be repeatedly transmitted in the T max , and transmits it to the MTC terminal through SIB1 as one of the si-Periodicity T values.
  • T max is determined first by considering that PBCH, SIB1, and other SIBs can be repeatedly transmitted, and this is used as a period (si-Periodicity) T, which is one transmission period of SIBx, and transmitted to SIB1. .
  • si-Periodicity T for all SIBx is transmitted to SIB1.
  • the MTC terminal may know T max without additional signaling.
  • the SIBx scheduling information transmitted to the terminal through SIB1 is as follows, the position at which the SIB is transmitted is shown in FIG. 17.
  • the PBCH may be repeatedly transmitted using a portion except for a portion in which the SIB is repeatedly transmitted in FIG. 17, that is, a part of the frame filled with gray in FIG. 17. Also, in a frame in which the PBCH is repeatedly transmitted, the PBCH may be repeatedly transmitted after 64 frames having the T max .
  • a plurality of PBCH repetitive transmissions may be considered within a period of one PBCH repetitive transmission defined by T max .
  • T max a plurality of 40 ms frames filled with gray may be selected and used for PBCH repetitive transmission.
  • a plurality of PBCH repetitive transmissions are repeated for each period value T max .
  • the base station and the terminal should use the ⁇ value promised each other.
  • the base station may define a message that can directly transmit the transmission period of the intermittent PBCH repetitive transmission to the coverage-extended MTC terminal in the newly defined SIB.
  • the coverage extended MTC terminal may decode the PBCH for general PBCH transmission (not repeated transmission) in addition to the repeatedly transmitted PBCH.
  • the MTC terminal with extended coverage does not set a different operation according to the PBCH decoding failure because most of the PBCH decoding fails in general PBCH transmission.
  • the coverage-extended MTC terminal changes the base station and channel state. Since it may be assumed that it is in general coverage, it may be fed back to the base station so that the same operation as that of general coverage is possible in the future physical channel transmission.
  • 18 is a flowchart illustrating a MIB transmission / reception method according to another embodiment of the present invention.
  • 19 is a flowchart illustrating a method of receiving a MIB of a terminal according to another embodiment of the present invention.
  • 20 is a flowchart illustrating a MIB transmission method of a base station according to another embodiment of the present invention.
  • the base station configures a MIB information bit block for a terminal (eg, an MTC terminal) located in enhanced coverage (S1810 and S1910).
  • the MIB information bit block may include the fields described with reference to FIG. 2, but may also be a defined MIB information bit block for a terminal (eg, an MTC terminal) located in enhanced coverage.
  • the base station encodes the MIB information bit block for the terminal located in the enhanced coverage using, for example, TBCC (S1820, S1920).
  • the base station transmits a signal encoded with the MIB information bit block for the terminal located in the enhanced coverage to the terminal through the PBCH (S1830 and S1930).
  • the base station may transmit a signal in which system information for a terminal located in the enhanced coverage is encoded through the PBCH according to an intermittent Physical Broadcast Channel (PBCH) transmission period set using a transmission period of a system information block (SIB).
  • PBCH Physical Broadcast Channel
  • SIB system information block
  • the terminal receives a signal encoded with a MIB information bit block for a terminal located in enhanced coverage through a PBCH (S1830 and S2010).
  • the UE system information for the terminal located in the enhanced coverage through the PBCH according to the intermittent Physical Broadcast Channel (PBCH) transmission period set using the transmission period of the system information block (SIB) Can receive the encoded signal.
  • PBCH Physical Broadcast Channel
  • the transmission period of the system information block may be a period (si-Periodicity) T value set for transmission of the SIBx (natural number of x> 1).
  • the transmission period of the SIB System Information Block
  • n-si n is the SI message order
  • each of the period (si-Periodicity) T 0 , T 1 is the transmission period of the SIB (System Information Block)
  • the PBCH repetitive transmission period has a si-Periodicity T 0 , T 1 ,...
  • the transmission period of the system information block (SIB) may be a period (si-Periodicity) of the SIBx separately configured for the terminal located in the enhanced coverage.
  • the intermittent Physical Broadcast Channel (PBCH) transmission period may be a multiple of m and a divisor of 1024.
  • the terminal decodes the MIB information bit blocks for the terminal located in the coverage from the received signal (S1840 and S2020).
  • the extended MTC terminal is a frame corresponding to the intermittent PBCH repeated transmission period Only the repeated repeated PBCH can be combined and then decoded.
  • the terminal obtains the MIB from the decoded signal (S1850, S2030).
  • the terminal may proceed with an initial cell access procedure of the terminal shown in FIG. 1 based on the obtained MIB.
  • 21 is a diagram illustrating a configuration of a base station according to another embodiment.
  • a base station 2100 includes a controller 2110, a transmitter 2120, and a receiver 2130.
  • control unit 2110 may determine the overall base station according to the method for setting the transmission period in consideration of the transmission period value of the SIB. Control the operation.
  • the transmitter 2120 and the receiver 2130 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention.
  • the controller 2110 encodes the system information for the terminal located in the enhanced coverage.
  • the transmitter 2120 encodes system information for a UE located in enhanced coverage through PBCH according to an intermittent Physical Broadcast Channel (PBCH) transmission period set using a transmission period of a system information block (SIB). You can send a signal.
  • PBCH Physical Broadcast Channel
  • SIB system information block
  • 22 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • a user terminal 2200 includes a receiver 2210, a controller 2220, and a transmitter 2230.
  • the receiver 2210 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the controller 2220 is a general terminal according to the method for setting the transmission period in consideration of the transmission period value of the SIB when periodically transmitting the transmission resources of the PBCH for the MTC terminal required to perform the present invention described above To control the operation.
  • the transmitter 2230 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the receiver 2210 has system information for a UE located in the enhanced coverage through the PBCH according to an intermittent physical broadcast channel (PBCH) transmission period set using a transmission period of a system information block (SIB).
  • PBCH physical broadcast channel
  • SIB system information block
  • An encoded signal may be received.
  • the controller 2220 obtains system information by decoding the received signal.
  • the transmission period may be set in consideration of the transmission period value of the SIB, so that the transmission of the PBCH is effectively performed without additional signaling. You can set the repetition period of the resource.
  • the present invention relates to a method and apparatus for transmitting system information for coverage-extended MTC terminal, and more particularly, to a method and apparatus for setting a transmission resource for transmitting system information.
  • the transmission resources in the frequency domain where system information is transmitted are located at the center of the entire system band, for example, six physical resource blocks (PRBs). ) Can only be considered.
  • PRB physical resource block
  • a physical resource block (PRB) will be described as an example in relation to a transmission resource in a frequency domain.
  • the present invention is not limited thereto and may include a virtual resource block (VRB).
  • the terminal decodes and acquires control information for transmitting resource allocation information of the frequency resource on which the SIB is transmitted.
  • the PDCCH in which the control information is transmitted must be repeatedly transmitted in a plurality of subframes. Therefore, in order to reduce the burden on the terminal for decoding the control information, one or more specific physical resource blocks, for example, six physical resource blocks located at the center of the system band may be considered as resource allocation information of frequency resources to which system information is transmitted. .
  • the present invention provides a method and apparatus for scheduling time and frequency transmission resources used by a base station for SIB repeated transmission to a coverage-extended terminal.
  • the frequency resources used for repeated transmission of the SIB for the coverage-extended MTC terminal are 6 PRB pairs located centrally in consideration of the minimum system band of the communication system, eg, LTE, for example, 1.4 MHz. Can be fixed but not limited thereto.
  • the minimum transmission unit is defined as one PRB pair.
  • PSS, SSS, PBCH, RS, and control region OFDM symbols Control PDSCH transmission is performed on all resource elements except for resource element (RE) through which region OFDM symbols are transmitted.
  • the system band consists of an odd number of PRBs as shown in Table 6 below, it becomes ambiguous to select six PRB pairs in the center of the frequency resource of the repeatedly transmitted SIB.
  • use 6 PRB pairs with PRB index Floor (N PRB / 2) -3 to Floor (N PRB / 2) +3, or PRB index Ceil (N PRB / 2) -3 to Ceil (N Six PRB pairs, PRB / 2) +3, can be used.
  • the system band is 3Mhz
  • the frequency resource of the repetitively transmitted SIB consists of six central PRB pairs or odd PRBs for the entire system band, one PRB pair in the center and two PRB indexes smaller than this PRB pair
  • Six PRB pairs consisting of PRB pairs and three PRB pairs with a PRB index greater than this PRB pair, one PRB pair in the center, and three PRB pairs with a PRB index smaller than this PRB pair and this PRB pair
  • Six PRB pairs consisting of two PRB pairs of a large PRB index can be allocated.
  • the present invention is not limited thereto, and the number of PRB pairs may be smaller than six as frequency resources of the repeatedly transmitted SIB.
  • a specific number of adjacent or non-adjacent PRB pairs other than the central PRB pair may be allocated as frequency resources of the repeatedly transmitted SIB.
  • the present invention describes a method for allocating SIB resources without using the PDCCH for the coverage-extended MTC terminal.
  • the information bit size of the SIB transmitted to the coverage-extended MTC terminal may use a fixed value for each SIB or may fix the number of SIBs transmitted to the coverage-extended MTC terminal.
  • only QPSK modulation may be used for the extended UE.
  • SIB1 uses fixed time domain scheduling similar to MIB.
  • the transmission period of SIB1 may be a specific number of frames, and may be used for SIB1 transmission only in one or more specific subframes in a frame in which SIB1 is transmitted.
  • the frequency resource as described above, if the frequency resource of the SIB is repeatedly transmitted as described above, one PRB pair in the center and a PRB smaller than this PRB pair when configured with six PRB pairs in the center or odd PRBs for the entire band 6 PRB pairs consisting of two PRB pairs of the index and three PRB pairs of PRB index larger than this PRB pair, one PRB pair in the center and three PRB pairs of PRB index smaller than this PRB pair
  • Six PRB pairs consisting of two PRB pairs of PRB index larger than this PRB pair can be allocated.
  • the terminal decodes the frequency domain scheduling information through which SIB1 is transmitted by decoding control information of the PDCCH transmitted through SF # 5.
  • the UE blindly decodes the control information by using the SI-RNTI. In the case of SIB1, the central six PRB pairs are transmitted on a fixed frequency resource.
  • an SI window that may be used to transmit one SIBx may be defined as the number w of subframes (where w ⁇ ⁇ 1, 2, 3, 10, 15, 20, 40 ⁇ ).
  • the transmission resource used for one SIB transmission in the time domain is limited to one subframe, and the base station informs whether the SIB is scheduled in the CSS (Common Search Space) of the PDCCH transmitted every subframe.
  • the UE After blind decoding the PDCCH, the UE recognizes that the SIB is scheduled if the PDCCH succeeds, and checks resource allocation information of the frequency domain included in the PDCCH in a subframe in which the PDCCH is transmitted, and receives the SIB.
  • a time domain transmission resource used for repeated transmission of SIBx uses an SI window.
  • one subframe is used per one SIBx within the SI window w subframes for SIBx transmission.
  • all the w subframes defined by the SI window are all. Or may be transmitted using some subframes of w subframes.
  • the base station may set the SI window size w in consideration of the number of subframes used for repetitive transmission of SIBx.
  • a TDD special subframe in the SI window in which SIBx is repeatedly transmitted may also be used to repeatedly transmit SIBx.
  • an OFDM symbol corresponding to DwPTS capable of downlink transmission in a special subframe is used.
  • a downlink subframe to be used for repeated transmission of SIBx may be defined in advance for each UL / DL configuration in an SI window in which SIBx is repeatedly transmitted.
  • SIBx may be transmitted in a downlink subframe having the smallest number excluding SF # 0 according to UL / DL configuration.
  • different number of downlink subframes to be used for SIBx repetitive transmission and positions corresponding thereto may be defined in consideration of different downlink subframe numbers according to UL / DL configuration.
  • the UE may acquire UL / DL configuration information in advance through SIB1.
  • a si-Periodicity T value may be used for each SIBx. If n (n is SI message order) are each different si-Periodicity T 0 , T 1 ,... In the case of having a value of T (n-1), the repetitive transmission period of the SIBx is a period value allocated for each SIB.
  • the maximum value T max max ( T 0 , T 1 ,..., T (n-1) ) can be set.
  • the si-Periodicity T value of the SIBx may be set to T max , otherwise, one of the conventional si-Periodicity T Ss used in the conventional SIBx may be set. You can consider using the value as T max . Accordingly, the MTC terminal may know T max without additional signaling.
  • SIBx scheduling information transmitted to the UE through SIB1 is shown in Table 8 below, the location where the SIB is transmitted is shown in FIG. 23.
  • the base station may repeatedly transmit the SIBx after 64 frames of Tmax in a frame in which SIBx is repeatedly transmitted.
  • the base station may transmit the SIBx in the conventional method in the remaining SIBx transmission frame other than the portion indicated by hatching in FIG.
  • T max ⁇ ( ⁇ > 0 is a natural number) is a multiple of T max T max instead.
  • the base station and the terminal should use the ⁇ value promised each other.
  • the base station has a period T for each SIBx, and has a plurality of SI windows set for each period T. If the SIBx is transmitted in an arbitrary SI window, the control information used for transmitting the SIBx is repeatedly transmitted to the PDCCH of the previous SI window.
  • the control information used to transmit the SIBx is repeatedly transmitted to the SI window w starting at SFN 0.
  • 24 is a diagram illustrating another example to which another embodiment of the present invention is applied.
  • FIG. 24 illustrates a PDCCH transmission method for transmitting SIBx when the transmission period is T and w is 40ms for SIBx.
  • the base station repeatedly transmits the PDCCH in a first SI window corresponding to SFNs 0 to 3.
  • the base station repeatedly transmits the SIBx through the PDSCH in a second SI window corresponding to SFN T to (T + 3).
  • the PDCCH repeatedly transmitted includes control information corresponding to SIBx repeatedly transmitted through the PDSCH in a second SI window corresponding to SFN T to (T + 3).
  • the control information may be repeatedly transmitted to the same control channel element (CCE) for SIBx, but the present invention is not limited thereto.
  • the UE may blind decode by combining the received values of the repeatedly transmitted PDCCH, and may succeed in the same blind decoding only in the CCE in which control information for the SIBx is transmitted.
  • a si-Periodicity T value is used for each SIBx. If n (n is SI message order) are each si-Periodicity T 0 , T 1 ,... , T (n-1) In case of having a value, the repetitive transmission period of SIBx is a period value allocated for each SIBx.
  • the maximum value T max max ( T 0 , T 1 ,..., T (n-1) ) can be set.
  • the base station repeatedly transmits control information used for transmitting the SIBx to the PDCCH in the SI window corresponding to each SIBx in the first T max period.
  • the base station repeatedly transmits SIBx in the second T max period.
  • the UE decodes the control information by combining the received values of the PDCCH repeatedly transmitted in the first T max period.
  • the UE decodes the SIBx by combining the reception values of the PDSCH repeatedly transmitted in the second T max period.
  • 25 is a diagram showing another example to which another embodiment of the present invention is applied.
  • the SIBx scheduling information transmitted to the UE through SIB1 is shown in Table 9 below, the SI window position where the SIBx can be transmitted is shown in FIG. 25.
  • the base station repeatedly transmits SIB2 to SFN 64 to 67, SIB13 to SFN 68 to 71, and SIB14 to SFN 72 to 75.
  • the base station provides control information for repeatedly transmitting SIB2 to SFN 128 to 131, control information for repeatedly transmitting SIB13 to SFN 132 to 135, and control information for repeatedly transmitting SIB14 to SFN 136 to 139.
  • PDCCH repeat transmission.
  • the base station repeatedly transmits SIB2 to SFNs 192 to 195, SIB13 to SFNs 196 to 199, and SIB14 to SFNs 200 to 203.
  • the base station can repeatedly transmit SIBx in a period of 2 * T max .
  • T max is a multiple of T max.
  • the base station and the terminal should use the ⁇ value promised each other.
  • the base station may repeatedly transmit SIBx in a 2 * ⁇ T max period.
  • the base station may allocate a transmission resource of the SIB transmitted to the coverage-extended MTC terminal without additional downlink control signaling.
  • 26 is a flowchart illustrating a SIB transmission / reception method according to another embodiment of the present invention.
  • the base station 20 transmits system information for the coverage-extended MTC terminal.
  • the base station 20 sets transmission resources for transmitting system information according to the first and second embodiments.
  • the terminal 10 receives system information through a transmission resource set according to the first and second embodiments.
  • the base station 20 encodes SIB, which is system information for a terminal located in enhanced coverage (S2620).
  • the base station 20 transmits a signal encoded with the SIB, which is system information for the terminal located in the enhanced coverage, to the terminal through the PDSCH (S2630).
  • SIB system information for the terminal located in the enhanced coverage
  • the base station 20 transmits a signal encoded with system information for the terminal through the PDSCH of one or more resource blocks fixed as described above in the first embodiment.
  • the terminal receives a signal encoded with the SIB, which is system information for the terminal located in enhanced coverage, through the PDSCH (S2630).
  • the terminal 20 receives a signal encoded with system information for the terminal through the PDSCH of one or more resource blocks fixed as described above in the first embodiment.
  • the fixed one or more resource blocks may be six physical resource blocks in the center of the system band.
  • the fixed one or more resource blocks include one physical resource block in the center of the system band and two physical resource blocks of the index smaller than the physical resource block and this physical resource block. It may be six physical resource blocks composed of three physical resource blocks of an index larger than the resource block.
  • the fixed one or more resource blocks may include one physical resource block in the center and three physical resource blocks of an index smaller than the physical resource block and the physical resource block. There may be six physical resource blocks consisting of two physical resource blocks of a large index.
  • step S2620 when the system information is SIB (System Information Block) 1, the base station 20 can repeatedly transmit the signal encoded by SIB1 to a fixed subframe of a fixed frame at a fixed period. have. Also, in step S2620, the base station 20 encodes the SIBx in all or part of subframes defined by the SI window at regular intervals when the system information is SIBx (a natural number of x> 1) as described above in the second embodiment. The signal may be repeatedly transmitted.
  • SIB System Information Block
  • step S2620 when the system information is SIB (System Information Block) 1, the terminal 10 repeats the signal encoded by the SIB1 in a fixed subframe of a fixed frame at a fixed period. Receive.
  • the terminal 10 when the system information is SIBx (a natural number of x> 1), the terminal 10 encodes the SIBx in all or part of subframes defined by the SI window at regular intervals. Receive the signal repeatedly.
  • some of the subframes defined by the SI window may be subframe # 5, a TDD special subframe, or a predefined subframe.
  • n (where n is an SI message order) have different periods T 0 , T 1 ,...
  • the terminal decodes the SIB, which is system information for the terminal located in the coverage, from the received signal (S2640).
  • the coverage-extended MTC terminal may decode after combining the SIB repeatedly transmitted through the PDSCH.
  • the terminal obtains the SIB from the decoded signal (S2650).
  • the terminal may proceed with an initial cell access procedure of the terminal shown in FIG. 1 based on the obtained MIB.
  • FIG. 27 is a flowchart illustrating a SIB transmission / reception method according to another embodiment of the present invention.
  • the base station 20 repeatedly transmits control information about the SIB, which is system information, through the PDCCH at regular intervals (S2710).
  • SIBx a natural number of x> 1
  • the base station 20 repeatedly transmits control information about SIBx through the PDCCH at a constant period T.
  • step S2710 on the terminal side the terminal 10 repeatedly receives control information on the SIB, which is system information, through the PDCCH at a predetermined cycle as described above in the third embodiment.
  • SIBx a natural number of x> 1
  • the terminal 10 repeatedly receives control information about SIBx through the PDCCH at a predetermined period T.
  • the base station 20 encodes SIB, which is system information for a terminal located in enhanced coverage (S2720).
  • the base station 20 transmits a signal encoded with the SIB, which is system information for the terminal located in the enhanced coverage, to the terminal through the PDSCH (S2730).
  • SIB system information for the terminal located in the enhanced coverage
  • step S2730 the terminal 10 receives a signal encoded with SIB, which is system information for a terminal located in enhanced coverage, through the PPDSCH.
  • SIB system information for a terminal located in enhanced coverage
  • the terminal decodes the SIB, which is system information for the terminal located in the coverage, from the received signal (S2740).
  • the coverage-extended MTC terminal may decode after combining the SIB repeatedly transmitted through the PDSCH.
  • the terminal obtains the SIB from the decoded signal (S2750).
  • the terminal may proceed with an initial cell access procedure of the terminal shown in FIG. 1 based on the obtained MIB.
  • 28 is a diagram illustrating a configuration of a base station according to another embodiment.
  • a base station 2800 includes a controller 2810, a transmitter 2820, and a receiver 2830.
  • the control unit 2810 controls the overall operation of the base station according to setting the transmission resource for transmitting the system information for the MTC terminal required to perform the above-described present invention.
  • the transmitter 2820 and the receiver 2830 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
  • the controller 2810 encodes the system information for the terminal located in the enhanced coverage.
  • the transmitter 2820 may transmit a signal encoded with system information for the terminal through a physical downlink shared channel (PDSCH) of at least one fixed resource block.
  • PDSCH physical downlink shared channel
  • 29 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • a user terminal 2900 includes a receiver 2910, a controller 2920, and a transmitter 2930.
  • the receiver 2910 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the control unit 2920 controls the overall operation of the terminal according to the setting of the transmission resource for transmitting the system information for the MTC terminal required to perform the above-described present invention.
  • the transmitter 2930 transmits uplink control information, data, and messages to the base station through the corresponding channel.
  • the receiver 2910 may receive a signal in which system information for the UE is encoded through a physical downlink shared channel (PDSCH) of at least one fixed resource block.
  • the controller 2920 obtains system information by decoding the received signal.
  • PDSCH physical downlink shared channel
  • the above embodiments are related to a method and apparatus for transmitting system information for an MTC terminal, and are based on at least one of SIB time domain resource allocation information and transmission period setting information of an SIB repeatedly transmitted to the MTC terminal intermittently.
  • the transmission resource of the SIB transmitted to the coverage-extended MTC terminal may be allocated without additional downlink signaling.

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Abstract

La présente invention concerne un procédé pour transmettre un PBCH pour un terminal MTC à couverture améliorée, et plus spécifiquement, un procédé pour une station de base déterminant une trame pour transmettre un PBCH en utilisant un ID de cellule de station de base, pour le terminal MTC à couverture améliorée, un procédé de configuration de bits d'information transmis par un PBCH, un procédé pour un terminal recevant un PBCH obtenant un SFN d'une station de base, et des appareils correspondants. En outre, la présente invention concerne un procédé et un appareil pour établir un cycle de transmission en tenant compte de la valeur du cycle de transmission d'un bloc d'informations de système (SIB), lorsqu'une ressource de transmission d'un PBCH qui est transmis à un terminal positionné à l'intérieur de la couverture améliorée est transmise périodiquement. En outre, la présente invention concerne un procédé et un appareil, le procédé comprenant les étapes consistant à : recevoir, par le biais d'un canal partagé de liaison descendante physique (PDSCH) d'au moins un bloc de ressource fixe, un signal dans lequel des informations de système pour le terminal sont codées ; et décoder le signal et obtenir les informations de système.
PCT/KR2014/008817 2013-09-27 2014-09-23 Procédé pour émettre-recevoir des informations de système et appareil associé WO2015046853A1 (fr)

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KR20130115726 2013-09-27
KR10-2013-0115726 2013-09-27
KR20130132557 2013-11-01
KR10-2013-0132557 2013-11-01
KR20130132561 2013-11-01
KR10-2013-0132561 2013-11-01
KR10-2013-0135709 2013-11-08
KR20130135816 2013-11-08
KR20130135709 2013-11-08
KR10-2013-0135816 2013-11-08
KR10-2014-0067023 2014-06-02
KR20140067023A KR20150035675A (ko) 2013-09-27 2014-06-02 시스템 정보 송수신 방법 및 그 장치
KR1020140100793A KR20150052766A (ko) 2013-11-01 2014-08-06 시스템 정보 송수신 방법 및 그 장치
KR10-2014-0100793 2014-08-06
KR1020140107136A KR20150051305A (ko) 2013-11-01 2014-08-18 시스템 정보 송수신 방법 및 그 장치
KR10-2014-0107136 2014-08-18
KR1020140125326A KR20150051311A (ko) 2013-11-01 2014-09-19 시스템 정보 송수신 방법 및 그 장치
KR10-2014-0125326 2014-09-19

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CN107211346A (zh) * 2015-05-14 2017-09-26 株式会社Kt 用于改变系统信息的方法以及其设备
WO2017209583A1 (fr) * 2016-06-03 2017-12-07 Samsung Electronics Co., Ltd. Procédé et appareil de communication dans un système de communications sans fil
KR20170137587A (ko) * 2016-06-03 2017-12-13 삼성전자주식회사 무선 통신 시스템에 있어서 통신을 수행하는 방법 및 장치
CN107615865A (zh) * 2015-05-15 2018-01-19 株式会社Ntt都科摩 基站、用户装置以及广播信息发送接收方法
WO2018105899A1 (fr) * 2016-12-05 2018-06-14 Lg Electronics Inc. Procédé de traitement d'informations de système pour système de communication de type machine et dispositif associé
WO2018137231A1 (fr) * 2017-01-26 2018-08-02 Qualcomm Incorporated Codage et décodage de canal de diffusion
WO2018201970A1 (fr) * 2017-05-05 2018-11-08 中兴通讯股份有限公司 Procédé et appareil de transmission de message
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US11924790B2 (en) 2017-05-04 2024-03-05 Innovative Technology Lab Co., Ltd. Method and apparatus for communicating reference signal for broadcast channel
WO2018201970A1 (fr) * 2017-05-05 2018-11-08 中兴通讯股份有限公司 Procédé et appareil de transmission de message
WO2018201479A1 (fr) * 2017-05-05 2018-11-08 富士通株式会社 Procédé d'indication d'informations, procédé de détection d'informations et dispositif associé, et système de communication
US11399332B2 (en) 2017-05-05 2022-07-26 Zte Corporation Message transmission method and apparatus
US11632708B2 (en) 2018-09-24 2023-04-18 Google Llc Common search space configuration and system information acquisition

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