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WO2016053039A1 - Procédé et appareil de transmission d'informations de système - Google Patents

Procédé et appareil de transmission d'informations de système Download PDF

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Publication number
WO2016053039A1
WO2016053039A1 PCT/KR2015/010413 KR2015010413W WO2016053039A1 WO 2016053039 A1 WO2016053039 A1 WO 2016053039A1 KR 2015010413 W KR2015010413 W KR 2015010413W WO 2016053039 A1 WO2016053039 A1 WO 2016053039A1
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WO
WIPO (PCT)
Prior art keywords
information
system information
mtc
scheduling
block
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PCT/KR2015/010413
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English (en)
Korean (ko)
Inventor
이경준
박규진
강승현
최우진
Original Assignee
주식회사 케이티
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Priority claimed from KR1020150114271A external-priority patent/KR20160040418A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Publication of WO2016053039A1 publication Critical patent/WO2016053039A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a method and apparatus for transmitting and receiving system information for a machine type communication (MTC) terminal. More specifically, the present invention relates to a method for transmitting system information for an MTC terminal to support a low complexity UE category / type for the operation of the MTC terminal.
  • MTC machine type communication
  • Machine type communication (hereinafter referred to as "MTC" communication) is a form of data communication that refers to machine or machine communication, where one or more entities do not necessarily require human interaction. . MTC communication that does not require human interaction refers to all communication methods in which communication is performed without human intervention in the communication process.
  • the MTC terminal may be installed in a place where the radio environment is worse than that of the general terminal.
  • it may be necessary to repeatedly transmit control information and / or data of each physical channel transmitted in one subframe unit in a plurality of subframes.
  • the MTC terminal may be required to limit the use of radio resources. That is, it may be set to use some frequency resources or only some time resources.
  • the present invention is to propose a method and apparatus for efficiently transmitting a system information block even in a situation where time and frequency axis resources available to an MTC terminal are limited.
  • the present invention also proposes a method and apparatus for newly defining a system information block including dedicated system information for an MTC terminal and repeatedly transmitting the corresponding MTC dedicated system information block.
  • the present invention provides a master information block (MIB) and system information block 1 (System Information Block 1, SIB1) in a method of receiving a machine type communication (MTC) terminal system information; And receiving scheduling information included in the master information block or system information block 1 and repeatedly receiving one or more system information blocks except the system information block 1 based on the scheduling information.
  • MIB master information block
  • SIB1 System Information Block 1, SIB1
  • MTC machine type communication
  • the present invention is a method for transmitting the system information by the base station, it is included in the master information block (MIB) or system information block 1 (System Information Block 1, SIB1) for machine type communication (MTC) terminal It provides a method comprising the step of setting the scheduling information, the step of transmitting the master information block and system information block 1, and repeatedly transmitting one or more system information blocks except the system information block 1 based on the scheduling information. .
  • MIB master information block
  • SIB1 System Information Block 1, SIB1
  • MTC machine type communication
  • the present invention in the Machine Type Communication (MTC) terminal for receiving system information, the receiving unit and the master information receiving the Master Information Block (MIB) and System Information Block 1 (System Information Block 1, SIB1) It includes a control unit for checking the scheduling information included in the block or system information block 1, the receiving unit provides an MTC terminal device for repeatedly receiving one or more system information blocks except the system information block 1 based on the scheduling information.
  • MTC Machine Type Communication
  • the present invention is a base station for transmitting system information, scheduling included in a master information block (MIB) or system information block 1 (SIB1) for a machine type communication (MTC) terminal
  • a base station apparatus including a control unit for setting information, a transmission unit for transmitting a master information block and system information block 1, and repeatedly transmitting one or more system information blocks except system information block 1 based on scheduling information.
  • 1 is a diagram illustrating a procedure of transmitting system information.
  • FIG. 2 is a view for explaining the operation of the MTC terminal according to an embodiment of the present invention.
  • FIG 3 is a view for explaining the operation of the terminal according to the first embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a SIB repeated transmission method according to Method 1 in the second embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a SIB repeated transmission method according to Method 2 in the second embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a SIB repeated transmission method according to Method 3 in the second embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a SIB repeated transmission method according to Method 4 in the second embodiment of the present invention.
  • FIG. 8 is a view for explaining the operation of the terminal according to the second embodiment of the present invention.
  • FIG. 9 is a diagram illustrating an information element of a master information block including a field indicating whether to support coverage enhancement according to the present invention.
  • FIG. 10 is a diagram illustrating a SIB repeated transmission method according to a third embodiment of the present invention.
  • FIG. 11 is a view for explaining the operation of the terminal according to the third embodiment of the present invention.
  • FIG. 12 is a diagram for explaining an operation of a base station according to another embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a terminal configuration according to another embodiment of the present invention.
  • FIG. 14 is a diagram illustrating a 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 supporting 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 3GPP 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 3GPP Release 12 or lower, or newly defined Release 13 low cost (or low complexity) supporting low power consumption. ) May mean a UE category / type.
  • the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
  • the wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB).
  • a user terminal is a generic concept meaning a terminal in wireless communication.
  • user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
  • a base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS.
  • Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.
  • RRH remote radio head
  • RU radio unit
  • a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.
  • BSC base station controller
  • 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 eNB 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
  • a method for transmitting and receiving a downlink radio signal and a radio channel between a base station and a terminal defined in the conventional 3GPP LTE / LTE-Advanced system in case of any RRC connected terminal, all downlink subframes (or DRXs) are configured.
  • CSS Common Search Space
  • USS US-specific Search Space
  • PDCCH or EPDCCH which are downlink control channels of all downlink subframes configured in DRX on period, are monitored and transmitted from the corresponding cell.
  • Scheduling information for broadcasting / multicasting traffic such as System Information Block (SIB), random access response (RAR), paging message, and scheduling information for unicasting traffic for the corresponding UE can be obtained.
  • SIB System Information Block
  • RAR random access response
  • paging message and scheduling information for unicasting traffic for the corresponding UE can be obtained.
  • the terminal is defined to receive the broadcasting / multicasting message and the unicasting message through all downlink subframes.
  • the CSS configuration method for transmitting the scheduling information for the broadcasting / multicasting message for any terminal in the PDCCH or EPDCCH transmitted through any downlink subframe and transmitting the scheduling information for the unicasting message For how to configure the USS, refer to 3GPP TS 36.213 document.
  • the coverage of the LTE MTC terminal is conventional. It should be improved about 15dB compared with the coverage of general LTE / LTE-Advanced terminal. In addition, considering the performance reduction due to the above technology, the coverage of the LTE MTC terminal should be improved by 15 dB or more.
  • the requirements of the low complexity UE category / type for MTC operation are as follows.
  • Bandwidth reduced UEs should be able to operate within any system bandwidth.
  • the UE only needs to support 1.4 MHz RF bandwidth in downlink and uplink.
  • Reduced physical data channel processing e.g. relaxed downlink HARQ time line or reduced number of HARQ processes.
  • 1 is a diagram illustrating a procedure of transmitting system information.
  • the system information is composed of a master information block (MIB) and a plurality of system information blocks (SIBs).
  • MIB master information block
  • SIBs system information blocks
  • the terminal 100 receives the MIB from the base station 110 (S101).
  • the MIB contains essential information and has a 40 ms period.
  • the terminal 100 may receive the remaining SIBs except for SIB1 (S103). SIB messages other than SIB1 (for example, SIB2, 3, 4, ...) are included in a System Information (SI) message and transmitted. Mapping information for SI messages of respective SIBs is included in SIB1. When the terminal 100 receives the SIB1, the terminal 100 may know when other SIBs are transmitted. Each SIB is included in one SI message. One SI message may include several SIBs having the same period. Several SI messages may have the same period. The SI message is transmitted in an SI window, where one SI message is associated with the SI window. Only one SI message may be transmitted in one SI window. Repeated transmission of the SI message can be freely performed within the SI window.
  • SIB messages other than SIB1 for example, SIB2, 3, 4, .
  • SIB1 System Information
  • SIB1 System Information
  • the present invention proposes a method for efficiently transmitting the SIB for the MTC terminal.
  • all existing SIBs and the like are prevented from unnecessary repetition, so that the base station can efficiently manage radio resources.
  • FIG. 2 is a view for explaining the operation of the MTC terminal according to an embodiment of the present invention.
  • the MTC terminal includes receiving a master information block (MIB) and a system information block 1 (system information block 1, SIB1) and master information.
  • the method may include checking scheduling information included in the block or system information block 1 and repeatedly receiving one or more system information blocks except the system information block 1 based on the scheduling information.
  • the MTC terminal includes receiving a MIB and SIB1 (S210).
  • the MIB or SIB1 may include information on whether the cell transmitting the corresponding information is a cell supporting the operation of the MTC terminal.
  • the MIB or SIB1 may include indication information indicating whether the corresponding cell supports the MTC terminal.
  • the MTC terminal may determine whether to use the corresponding cell using the indication information.
  • SIB1 may be received when the cell supports the MTC terminal after the MIB is received.
  • the MTC terminal may check whether the corresponding cell supports the MTC terminal according to the transmission form of the MIB or SIB1. For example, when the SIB1 is repeatedly received a predetermined number of times, the MTC terminal may determine that the corresponding cell supports the MTC terminal.
  • SIB1 may be SIB1 set to MTC terminal only, unlike SIB1 of the conventional general terminal.
  • the general terminal refers to an existing LTE or LTE-Advanced terminal to which the above-described MTC operating condition is not applied.
  • the MTC terminal includes the step of confirming the scheduling information included in the MIB or SIB1 (S220).
  • the MTC terminal may check scheduling information about system information included in the MIB or SIB1.
  • the MTC terminal may check scheduling information for receiving system information blocks other than SIB1 through MIB or SIB1.
  • the scheduling information may include information related to repetitive transmission and radio resource mapping of system information blocks except for SIB1.
  • the scheduling information may include at least one of time and frequency axis radio resource information and repetitive transmission related information in which one or more system information is transmitted.
  • the scheduling information may include one of type information, transmission period information, repeat transmission count information, repeat transmission period information, repeat transmission frame information, repeat transmission subframe information, start subframe information, and coverage level information of each of the one or more system information blocks. It may also include one or more pieces of information.
  • the scheduling information may include at least one of window size information of the system information message and system information message scheduling information including subframe information repeatedly transmitted within the window size.
  • the system information message may include one or more system information blocks having the same period.
  • the above-described SIB1 and one or more system information blocks may include MTC terminal dedicated system information repeatedly transmitted a predetermined number of times. That is, SIBs including SIB1 may be MTC terminal dedicated SIB newly defined for MTC terminal. Alternatively, SIBs other than SIB1 may be STC dedicated SIBs newly defined for MTC terminals. Information included in the scheduling information and the terminal operation according to the same will be described in more detail with reference to the following embodiments.
  • the MTC terminal may include repeatedly receiving one or more system information blocks except for SIB1 based on the scheduling information (S230). For example, the MTC terminal may receive the remaining SIBs except for SIB1 based on the received scheduling information. As described above, SIBs except SIB1 may be defined as MTC terminals only. In addition, SIBs may be repeatedly received according to a predetermined number of times. That is, the SIBs may be repeatedly transmitted according to the number of times determined according to the coverage level of the MTC terminal.
  • the MTC terminal may receive system information for the MTC terminal.
  • SIB an MTC dedicated SIB which is distinguished from an existing SIB
  • SIB type number such as SIB1A and SIB2A.
  • the MTC terminal receives the SIB1 newly defined for the MTC terminal after receiving the MIB.
  • SIB1A since the A is attached to the SIB type number, it is referred to as SIB1A.
  • SIB1A set to MTC terminal can be always transmitted using a fixed radio resource at regular intervals.
  • SIB1A may include only information necessary for the MTC terminal. That is, at least one of size information, scheduling information, ac-barring configuration information, extended access barring information, cell reselection information, and neighbor cell information of MTC dedicated SIBs may be included.
  • the SIB1A may be composed of several SIB messages. In addition, SIB1A or the like may be set to a fixed size.
  • FIG. 3 is a view for explaining the operation of the terminal according to the first embodiment of the present invention. Referring to Fig. 3, the operation of the terminal according to the first embodiment will be described by way of example.
  • the MTC terminal receives the MIB (S300).
  • the MIB may include indication information on whether the cell supports the MTC terminal. That is, when the cell performs an operation such as repetitive transmission for the MTC terminal, the corresponding indication information may be included in the MIB and received.
  • the MTC terminal determines whether the corresponding cell supports the MTC terminal using the indication information of the MIB (S310).
  • the MTC terminal regards the current cell as a barred cell and performs a cell reselection procedure (S320). That is, the MTC terminal may select a cell by selecting another frequency having the same priority as the frequency of the current cell, or may select a cell of a frequency having a low priority.
  • the MTC terminal performs step S300 again for the selected cell.
  • the MTC terminal receives SIB1 according to the information of the MIB (S330).
  • SIB1 received by the MTC terminal refers to SIB1A set to MTC terminal only.
  • the MTC terminal may obtain information on whether the corresponding cell supports the MTC terminal in another way. For example, whether the cell supports the MTC terminal may be determined through an attempt to receive an MTC dedicated SIB transmitted using a fixed resource such as SIB1 or SIB1A. That is, if the reception of the SIBs transmitted using the fixed resource is successful, it may be determined that the cell supports the MTC terminal.
  • the SIB1A may always be transmitted using a fixed frequency resource at a predetermined period (for example, 80 ms).
  • the SIB1A may be repeatedly transmitted in the remaining radio frames. In addition, repetition may be transmitted even within a corresponding radio frame in which SIB1A is transmitted. Repeated transmission in one radio frame may be generated in one or a plurality of predefined subframes.
  • the repetitive transmission pattern may be determined according to the number of repetitive transmissions set in the MIB or the coverage enhancement level. Or it may be transmitted at a predefined maximum number of repeated transmissions.
  • the MTC terminal may check scheduling information of MTC dedicated SIBs in order to receive the remaining SIBs except for SIB1A (S340).
  • MTC dedicated SIBs when there are a plurality of MTC dedicated SIBs, the MTC terminal receives SIB2, 3, 4... After receiving SIB1A.
  • MTC dedicated SIBs may be additionally received according to MTC help information or scheduling information of SIB1A (S350).
  • MTC assistance information or scheduling information of SIB1A scheduling information described below with reference to FIG. 2 or below may be used.
  • the MTC terminal of the present invention may receive the MTC dedicated SIB based on the scheduling information of the SIB1 without receiving the existing SIB such as SIB2, 3, and 4.
  • the MTC terminal may receive an MTC dedicated SIB through downlink control information (DCI) of the PDCCH or the EPDCCH.
  • the MTC terminal may receive MTC dedicated SIBs by combining two pieces of information, SIB1 and DCI.
  • the corresponding MTC terminals may attempt to receive using the newly defined MTC-SI-RNTI.
  • the SIB1 including the aforementioned MTC dedicated SIB scheduling information may be an existing SIB1 or a SIB1A newly defined as an MTC only.
  • MTC dedicated SIBs may be set to a fixed size and may be transmitted using a fixed frequency resource.
  • each SIB may include indication information for distinguishing SIBs. For example, indication information such as 00 for SIB2A and 01 for SIB3A may be included in the SIBs.
  • SIB1 or SIB1A may include scheduling information for MTC dedicated SIBs.
  • the scheduling information may include at least one of time and frequency axis radio resource information and repetitive transmission related information in which one or more system information is transmitted. More specifically, the scheduling information includes type information, transmission period information, repeat transmission count information, repeat transmission period information, repeat transmission frame information, repeat transmission subframe information, start subframe information, and coverage level information of each of the one or more system information blocks. It may include one or more of the information.
  • each information that may be included in the scheduling information is as follows.
  • SIB type information Includes type information for each SIB. For example, it includes information for identifying types such as SIB2A, SIB3A, SIB4A, and the like.
  • SIB Periodicity Information for Each SIB Contains information about a transmission period of each SIB.
  • Start sub-frame number or offset value information includes information on the number of the subframe in which the first SIB transmission occurs or the offset value indicating the start subframe.
  • Repetitive transmission number information includes a transmission number or a value that may mean the number of transmissions repeated within a transmission period.
  • -Coverage enhancement level information It includes a value that is divided into steps in order to support coverage enhancement (Coverage Enhancement).
  • Repetition Transmission Period (Repetition Periodicity) Information Contains a value for a repeated transmission period in which the same SIB is transmitted within the SIB transmission period. It may be expressed directly in ms unit, or may be expressed in the form of SFN mod N (N is an integer).
  • Radio frame information repeatedly transmitted in a period includes information indicating a radio frame in which repeated transmission occurs in a transmission period.
  • the corresponding information may be included as a value such as a bitmap, a list of subframe numbers, an even / odd subframe, a repetition period, and the like.
  • Subframe information repeatedly transmitted in one radio frame includes information indicating a subframe repeatedly transmitted in one radio frame. For example, it may be included as a value such as a bitmap, a list of subframe numbers, an even / odd subframe, a repetition period, and the like.
  • Frequency resource information on which the corresponding SI message or SIB is to be transmitted may include a frequency resource location and frequency hopping information on which the SI message or SIB is to be transmitted.
  • Transport Block Size (TBS) of the SI message or the SIB It may include a TBS index value of the SI message or the SIB.
  • the scheduling information may further include information required by the MTC terminal such as access class-barring (ac-barring) configuration information, extended access barring information, cell reselection information, and neighbor cell information.
  • access class-barring as-barring
  • extended access barring information required by the MTC terminal
  • neighbor cell information information required by the MTC terminal
  • MTC dedicated SIBs may be transmitted at a predetermined period (for example, 20 ms, 50 ms, 100 ms, 500 ms, etc.) according to the contents set in SIB1 or SIB1A.
  • SIB1 may be used to mean SIB1A which is newly defined for the MTC terminal described in the conventional SIB1 or the first embodiment.
  • MTC dedicated SIB means the remaining SIB except for the above-described SIB1 for convenience of description.
  • FIG. 4 is a diagram illustrating a SIB repeated transmission method according to Method 1 in the second embodiment of the present invention.
  • the MTC dedicated SIBs are repeatedly transmitted according to the number of repetitive transmissions in the corresponding period. . That is, the transmission occurs every (SIB transmission period) / (the number of repeated transmissions) from the start subframe.
  • FIG. 5 is a diagram illustrating a SIB repeated transmission method according to Method 2 in the second embodiment of the present invention.
  • the MTC dedicated SIBs are determined according to the number of repetitive transmissions corresponding to the corresponding level. Can be sent repeatedly.
  • the coverage enhancement level value may be information included in the MIB, not SIB1 or SIB1A.
  • repetitive transmission may be performed according to the number of repetitive transmissions according to the preset coverage level. That is, in the case of coverage enhancement level 2, when the number of repetitive transmissions is mapped to 10, repetitive transmissions may be generated every (SIB transmission period) / (the number of repetitive transmissions) from the set start subframe.
  • the number of repetitive transmissions according to the coverage enhancement level may be broadcast for setting and changing through the SIB.
  • FIG. 6 is a diagram illustrating a SIB repeated transmission method according to Method 3 in the second embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a SIB repeated transmission method according to Method 4 in the second embodiment of the present invention.
  • MTC dedicated SIBs may be configured for repetitive transmission based on scheduling information that may be included in SIB1 or SIB1A or MIB. Therefore, repetitive transmission may be performed by any one of the aforementioned methods 1 to 4 according to the type or type of information included in the scheduling information. Alternatively, the above-described methods 1 to 4 may be mutually combined or a part of the methods 1 to 4 may be mutually combined according to each information included in the scheduling information. In addition, the MTC terminal of the present invention may check the repetitive transmission resource of the aforementioned MTC dedicated SIB based on the information included in the scheduling information according to the method of configuring the scheduling information.
  • the size and frequency resource information of the above-described SIBs may be configured through SIB1A together with time resource information.
  • the above-described SIBs may be of a fixed size and may be transmitted using a fixed frequency resource. It may also be scheduled through DCI of PDCCH or EPDCCH.
  • the corresponding MTC terminals attempt to receive using the newly defined MTC-SI-RNTI.
  • Dedicated SIBs for each MTC terminal may include indication information for distinguishing SIBs.
  • indication information such as SIB2A has a value of "00" and SIB3A has a value of "01" may be included in each SIB.
  • the repetitive transmission operation described above may be applied not only to SIB transmission but also to a paging message and a random access response (RAR) message.
  • RAR random access response
  • SIB1 may mean the above-described SIB1A.
  • MTC terminal of the present invention receives the MIB and SIB1 (S800).
  • MIB or SIB1 may include indication information indicating whether a corresponding cell supports MTC terminal. That is, it may include indication information on whether the corresponding cell performs a repetition transmission operation for the MTC terminal. In this case, broadcast to the MIB or SIB1 through the corresponding indication information.
  • the indication information may include an information field including information on whether the corresponding cell supports coverage enhancement.
  • the indication information may be added to the MIB or SIB1 as an information element as shown in Table 1.
  • Table 1 the field including the indication information is described as a coverage enhancement field, but the name is not limited thereto.
  • FIG. 9 is a diagram illustrating an information element of a master information block including a field indicating whether to support coverage enhancement according to the present invention.
  • the aforementioned coverage enhancement field may be added to an information element of the MIB.
  • the value of the coverage enhancement field added to the MIB may be a BIT STRING or an INTEGER value.
  • the size of the field is 1, 2, 3.... And various integer values.
  • SIB1 even when the indication information is included in SIB1, the above-described case of MIB may be applied. That is, a specific field for including indication information may be added to SIB1.
  • the MTC terminal may determine whether the corresponding cell is a cell supporting the MTC terminal using the aforementioned indication information (S810).
  • the MTC terminal determines that the current cell is a barred cell and performs a cell reselection procedure (S820). That is, the MTC terminal may select a cell by selecting another frequency having the same priority as the frequency of the current cell, or may select a cell of a frequency having a low priority. The process of step S800 is performed again for the selected cell.
  • the cell when the cell supports the MTC terminal, it may receive the SIB1 based on the MIB information. Alternatively, the remaining SIBs may be received based on the SIB1 information. Meanwhile, the determination of whether the corresponding cell supports the MTC terminal may be performed in various ways as well as checking the above-described indication information. For example, the MTC terminal may determine through an attempt to receive an MTC dedicated SIB transmitted through a fixed radio resource. That is, when the SIB configured for MTC is transmitted through a fixed radio resource, the MTC terminal may determine that the cell supports the MTC terminal when the SIBs are successfully received in the fixed radio resource. Alternatively, the MTC terminal may need to receive the DCI of the PDCCH or EPDCCH in order to receive the MTC dedicated SIB. Alternatively, when the MTC dedicated SIB is transmitted at a fixed frequency and / or a fixed size, the MTC dedicated SIB may be received based on the DCI of the PDCCH or the EPDCCH.
  • the MTC terminal After receiving the SIB1, the MTC terminal checks scheduling information for receiving the remaining MTC dedicated SIBs (S830). Thereafter, the MTC terminal may repeatedly receive the remaining SIB except for SIB1 based on the confirmed scheduling information or the MTC assistance information (S840).
  • MTC dedicated SIBs may be received according to MTC help information and scheduling information of SIB1.
  • the scheduling information may include at least one of time resource information, frequency resource information, SI message size information, or size information of the SIB message of the MTC dedicated SIBs.
  • the MTC terminal receives SIB1 and then SIB2, 3, 4,...
  • the MTC dedicated SIBs (eg, SIB2A, 3A, ...) may be received through the DCI of the PDCCH or the EPDCCH without receiving the existing SIB.
  • SI messages or SIBs may be set to a fixed size and may be transmitted using a fixed frequency resource.
  • the corresponding MTC terminals attempt to receive using the newly defined MTC-SI-RNTI.
  • MTC dedicated SIB may be configured with one or a plurality.
  • the scheduling information included in the above-described SIB1 may include at least one of the following information.
  • SIB type information Includes type information for each SIB. For example, it includes information for identifying types such as SIB2A, SIB3A, SIB4A, and the like.
  • SIB Periodicity Information for Each SIB Contains information about a transmission period of each SIB.
  • Start sub-frame number or offset value information includes information on the number of the subframe in which the first SIB transmission occurs or the offset value indicating the start subframe.
  • Repetitive transmission number information includes a transmission number or a value that may mean the number of transmissions repeated within a transmission period.
  • -Coverage enhancement level information It includes a value that is divided into steps in order to support coverage enhancement (Coverage Enhancement).
  • Repetition Transmission Period (Repetition Periodicity) Information Contains a value for a repeated transmission period in which the same SIB is transmitted within the SIB transmission period. It may be expressed directly in ms unit, or may be expressed in the form of SFN mod N (N is an integer).
  • Radio frame information repeatedly transmitted in a period includes information indicating a radio frame in which repeated transmission occurs in a transmission period.
  • the corresponding information may be included as a value such as a bitmap, a list of subframe numbers, an even / odd subframe, a repetition period, and the like.
  • Subframe information repeatedly transmitted in one radio frame includes information indicating a subframe repeatedly transmitted in one radio frame. For example, it may be included as a value such as a bitmap, a list of subframe numbers, an even / odd subframe, a repetition period, and the like.
  • Frequency resource information to which the corresponding SI message or SIB is to be transmitted This may include the location or frequency hopping information of the frequency resource to which the SI message or SIB is to be transmitted.
  • Transport Block Size (TBS) of the SI message or the SIB It may include a TBS index value of the SI message or the SIB.
  • the MTC terminal of the present invention may receive the remaining SIBs except for the SIB1 or SIB1A.
  • the MTC terminal may receive MTC dedicated SIBs (or SIBs) based on scheduling information that may be included in SIB1 or SIB1A.
  • the MTC dedicated SIB may be received through downlink control information (DCI) of the PDCCH or the EPDCCH.
  • DCI downlink control information
  • the MTC terminal may receive SIBs other than SIB1 or SIB1A through a system information message.
  • the scheduling information of MTC dedicated SIBs included in SIB1 or SIB1A may include at least one of the following information.
  • SI window length Contains information about a certain time window in which one SI message is transmitted. One SI message must be transmitted within one SI window, and the message can be repeatedly transmitted several times.
  • SI System Information
  • SI-Periodicity Contains information about the frequency of the SI message.
  • ⁇ SIB Mapping Information Contains information about the SIB type included in the SI message.
  • Subframe information repetitively transmitted in the SI window information indicating a subframe repeatedly transmitted in the SI window (for example, a bitmap, a list of radio frames and subframe numbers, an even / odd subframe, Start subframe and repeated transmission period, start subframe and repeated transmission number, etc.).
  • Frequency resource information to which the corresponding SI message or SIB is to be transmitted The frequency resource location or frequency hopping information to which the SI message or SIB is to be transmitted may be included.
  • TBS Transport Block Size
  • FIG. 10 is a diagram illustrating a SIB repeated transmission method according to a third embodiment of the present invention.
  • SIB messages (SIB2, 3, 4, ...) other than SIB1 or SIB1A are transmitted in a SI (System Information) message.
  • Mapping information for SI messages of SIBs is included in SIB1 or SIB1A.
  • the MTC terminal may receive SIB1 or SIB1A to obtain information about when other SIBs are transmitted.
  • Each SIB is included in one SI message.
  • one SI message may include one or several SIB messages with the same period. Several SI messages may have the same period.
  • SI messages are transmitted within an SI window, each SI message being associated with an SI window. Only one SI message may be transmitted in one SI window. Repeat transmission of the SI message is performed in the SI window, and information on which subframe the repeated transmission is performed may be preset through SIB1.
  • the size and frequency resource information of each SI message or SIBs may be configured through SIB1A together with time resource information.
  • each SI message may be of a fixed size and may be transmitted using a fixed frequency resource.
  • SI message 2 (SI # 2) may also be transmitted in a transmission period of 160 ms in the SI window as in the SI message 1 described above.
  • repetitive transmission may be performed in subframes 2, 4, and 7 within each SI window.
  • FIG. 11 is a view for explaining the operation of the terminal according to the third embodiment of the present invention.
  • MTC terminal of the present invention receives the MIB and SIB1 or SIB1A (S1100).
  • MIB or SIB1 or SIB1A may include indication information indicating whether a corresponding cell supports MTC terminal. That is, when the cell performs an operation such as repetitive transmission for the MTC terminal, the cell broadcasts to the MIB or SIB1 or SIB1A through the corresponding indication information.
  • an information element as shown in Table 2 below may be added to the MIB or SIB1 or SIB1A.
  • the coverage enhancement field may indicate whether the corresponding cell supports coverage enhancement. That is, the coverage enhancement field may include information on whether the corresponding cell supports the coverage enhancement MTC terminal or the MTC terminal.
  • the MTC terminal receiving the MIB or SIB1 or SIB1A may check whether the corresponding cell is a cell supporting the MTC terminal (S1110). Whether the cell supports the MTC terminal can be confirmed through the above-described indication information. Alternatively, whether the corresponding cell supports the MTC terminal may also be checked through whether the SIB1 or the SIB1A is repeatedly received. That is, whether the corresponding cell supports the MTC terminal may be determined through an attempt to receive an MTC dedicated SIB transmitted using a fixed resource such as SIB1 or SIB1A. For example, if the MTC dedicated SIB is successfully received, it may be determined that the corresponding cell supports the MTC terminal.
  • the MTC terminal determines that the current cell is a barred cell and performs a cell reselection procedure (S1120). For example, the MTC terminal may select a cell by selecting another frequency having the same priority as the frequency of the current cell, or may select a cell of a frequency having a lower priority. The MTC terminal performs step S1100 again on the selected cell.
  • the MTC terminal If the cell supports the MTC terminal, it receives SIB1 or SIB1A or the remaining SIBs according to the information of MIB or SIB1 or SIB1A. To this end, the MTC terminal checks the scheduling information of SIB1 or SIB1A (S1130). For example, after receiving SIB1 or SIB1A, the MTC terminal receives SIB 2, 3, 4,... Instead of receiving the existing SIB, the MTC terminal receives dedicated SIBs (eg, SIB2A, 3A, ...) according to MTC assistance information or scheduling information of SIB1 or SIB1A (S1140).
  • SIB2A dedicated SIBs
  • the MTC terminal may receive MTC terminal dedicated SIBs (eg, SIB2A, 3A, ...) through the DCI of the PDCCH or EPDCCH.
  • the scheduling information included in the above-described SIB1 or SIB1A may include at least one of the following information.
  • SI window length Contains information about a certain time window in which one SI message is transmitted. One SI message must be transmitted within one SI window, and the message can be repeatedly transmitted several times.
  • SI System Information
  • SI-Periodicity Contains information about the frequency of the SI message.
  • ⁇ SIB Mapping Information Contains information about the SIB type included in the SI message.
  • Subframe information repetitively transmitted in the SI window information indicating a subframe repeatedly transmitted in the SI window (for example, a bitmap, a list of radio frames and subframe numbers, an even / odd subframe, Start subframe and repeated transmission period, start subframe and repeated transmission number, etc.).
  • Frequency resource information to which the corresponding SI message or SIB is to be transmitted The frequency resource location or frequency hopping information to which the SI message or SIB is to be transmitted may be included.
  • TBS Transport Block Size
  • the above-described SIB for the MTC terminal may be of a fixed size, and frequency resources may also be fixed and transmitted. If the SIBs for the MTC terminal are transmitted using a fixed size and a fixed frequency resource, the MTC terminal may receive the SIBs without receiving the PDCCH or the EPDCCH. Alternatively, the SI message or the size information and the frequency resource information of the SIBs may be transmitted together with the time resource information through the SIB1A. In this case, the remaining SIBs may be received using the SIB1A.
  • FIG. 12 is a diagram for explaining an operation of a base station according to another embodiment of the present invention.
  • the system information block 1 below means the above-described SIB1 or SIB1A.
  • a master information block (MIB) or system information block 1 (SIB1) for a machine type communication (MTC) terminal The method includes setting scheduling information included in a), transmitting a master information block and a system information block 1, and repeatedly transmitting one or more system information blocks except the system information block 1 based on the scheduling information.
  • the base station of the present invention includes setting scheduling information included in a master information block (MIB) or a system information block 1 (SIB1) for an MTC terminal. (S1210).
  • MIB or SIB1 may be configured to include scheduling information related to transmission resource or transmission time of MTC dedicated SIBs.
  • the scheduling information may include information related to repetitive transmission and radio resource mapping of system information blocks except for SIB1.
  • the scheduling information may include at least one of time and frequency axis radio resource information and repetitive transmission related information in which one or more system information is transmitted.
  • the scheduling information may include one of type information, transmission period information, repeat transmission count information, repeat transmission period information, repeat transmission frame information, repeat transmission subframe information, start subframe information, and coverage level information of each of the one or more system information blocks. It may also include one or more pieces of information.
  • the scheduling information may include at least one of window size information of the system information message and system information message scheduling information including subframe information repeatedly transmitted within the window size.
  • the system information message may include one or more system information blocks having the same period.
  • the MIB or SIB1 may include information on whether the cell transmitting the corresponding information is a cell supporting the operation of the MTC terminal.
  • the MIB or SIB1 may include indication information indicating whether the corresponding cell supports the MTC terminal.
  • the MTC terminal may determine whether to use the corresponding cell using the indication information.
  • the MTC terminal may check whether the corresponding cell supports the MTC terminal according to the transmission form of the MIB or SIB1. For example, when the SIB1 is repeatedly received a predetermined number of times, the MTC terminal may determine that the corresponding cell supports the MTC terminal.
  • the base station includes transmitting the master information block and the system information block 1 (S1220).
  • the aforementioned MIB and SIB1 may be transmitted to the MTC terminal.
  • the MIB may include scheduling information of SIB1.
  • SIB1 may be configured for MTC terminal only, and may be transmitted using a fixed size or a fixed frequency resource.
  • transmission scheduling information of SIB1 may be transmitted through PDCCH or EPDCCH.
  • the base station repeatedly transmits one or more system information blocks except for the system information block 1 based on the scheduling information (S1230).
  • the base station may transmit the remaining SIB except for SIB1 according to the aforementioned scheduling information included in the MIB or SIB1.
  • the remaining SIBs may be set to MTC only.
  • SIBs may be configured and transmitted in an SI message.
  • SIBs may be repeatedly transmitted to the MTC terminal through repeated transmission. In this case, a specific SIB repetition period, repetitive transmission position, etc. may be included in the above-described scheduling information.
  • the MTC terminal may check the scheduling information to obtain repetition information of the SIBs, or may process the information included in the scheduling information to obtain repetition information of the SIBs.
  • the base station may perform all the operations required to perform the above-described embodiments of the present invention as needed.
  • FIG. 13 is a diagram illustrating an MTC terminal configuration according to another embodiment of the present invention.
  • the MTC terminal 1300 includes a receiver 1330 and a master information block for receiving a master information block (MIB) and a system information block 1 (SIB1) or
  • the controller 1310 may identify scheduling information included in the system information block 1.
  • the receiver 1330 may repeatedly receive one or more system information blocks except for the system information block 1 based on the scheduling information.
  • the receiver 1330 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the scheduling information received by the receiver 1330 may include information related to repetitive transmission and radio resource mapping of system information blocks except for SIB1.
  • the scheduling information may include at least one of time and frequency axis radio resource information and repetitive transmission related information in which one or more system information is transmitted.
  • the scheduling information may include one of type information, transmission period information, repeat transmission count information, repeat transmission period information, repeat transmission frame information, repeat transmission subframe information, start subframe information, and coverage level information of each of the one or more system information blocks. It may also include one or more pieces of information.
  • the scheduling information may include at least one of window size information of the system information message and system information message scheduling information including subframe information repeatedly transmitted within the window size.
  • the system information message may include one or more system information blocks having the same period.
  • control unit 1310 is a general MTC terminal according to the SIB scheduling information required to perform the above-described present invention and the MTC dedicated SIB setting and the reception of system information efficiently in a situation where the frequency bandwidth is limited ( The operation of 1300 is controlled.
  • the transmitter 1320 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • FIG. 14 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
  • the base station 1400 is a control unit for setting the scheduling information contained in the master information block (MIB) or system information block 1 (System Information Block 1, SIB1) for the MTC terminal And a transmitter 1420 for transmitting the master information block and the system information block 1 and repeatedly transmitting one or more system information blocks except the system information block 1 based on the scheduling information.
  • MIB master information block
  • SIB1 System Information Block 1, SIB1
  • the controller 1410 may generate scheduling information of the SIB for the MTC dedicated SIB or the MTC terminal.
  • the scheduling information may include information related to repetitive transmission and radio resource mapping of system information blocks except for SIB1.
  • the scheduling information may include at least one of time and frequency axis radio resource information and repetitive transmission related information in which one or more system information is transmitted.
  • the scheduling information may include one of type information, transmission period information, repeat transmission count information, repeat transmission period information, repeat transmission frame information, repeat transmission subframe information, start subframe information, and coverage level information of each of the one or more system information blocks. It may also include one or more pieces of information.
  • the scheduling information may include at least one of window size information of the system information message and system information message scheduling information including subframe information repeatedly transmitted within the window size.
  • the system information message may include one or more system information blocks having the same period.
  • controller 1410 controls the overall operation of the base station 1400 according to the setting of the MTC dedicated SIB required for carrying out the present invention and the repeated transmission of the MTC dedicated SIB.
  • the transmitter 1420 and the receiver 1430 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

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Abstract

La présente invention concerne un procédé de transmission et de réception d'informations de système pour un terminal de communication de type machine (MTC), et un appareil associé. De manière plus spécifique, la présente invention concerne un procédé de transmission d'informations de système pour un terminal MTC de façon à prendre en charge une catégorie/type d'équipement utilisateur (UE) de faible complexité pour le fonctionnement du terminal MTC. En particulier, la présente invention suggère un procédé et un appareil pour recevoir, par un terminal de communication de type machine (MTC), des informations de système, le procédé comprenant les étapes consistant : à recevoir un bloc d'informations maître (MIB) et un bloc d'informations de système 1 (SIB 1) ; à identifier des informations de planification incluses dans le bloc d'informations maître ou le bloc d'informations de système 1 ; et à recevoir de manière répétée un ou plusieurs blocs d'informations de système excluant le bloc d'informations de système 1 sur la base des informations de planification.
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US11848779B2 (en) 2017-03-16 2023-12-19 Kt Corporation Method for duplicately receiving control message, and device therefor
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WO2019009673A1 (fr) * 2017-07-06 2019-01-10 엘지전자 주식회사 Procédé et dispositif d'émission ou de réception d'un signal sans fil dans un système de communication sans fil
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CN112449425A (zh) * 2019-08-31 2021-03-05 华为技术有限公司 一种通信方法和装置
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