WO2009128438A1 - Station de base radio et station mobile - Google Patents

Station de base radio et station mobile Download PDF

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Publication number
WO2009128438A1
WO2009128438A1 PCT/JP2009/057487 JP2009057487W WO2009128438A1 WO 2009128438 A1 WO2009128438 A1 WO 2009128438A1 JP 2009057487 W JP2009057487 W JP 2009057487W WO 2009128438 A1 WO2009128438 A1 WO 2009128438A1
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WO
WIPO (PCT)
Prior art keywords
system information
subframe
transmission
base station
radio base
Prior art date
Application number
PCT/JP2009/057487
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English (en)
Japanese (ja)
Inventor
幹生 岩村
Original Assignee
株式会社エヌ・ティ・ティ・ドコモ
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Publication date
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Publication of WO2009128438A1 publication Critical patent/WO2009128438A1/fr

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    • 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
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • 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
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the present invention provides a radio base station configured to transmit one first system information and one or more other system information to the mobile station, and one first system information from the radio base station.
  • the present invention relates to a mobile station configured to receive one system information and one or more other system information.
  • the radio base station eNB transmits a MIB (Master Information Block) to the mobile station UE by BCH (Broadcast Channel).
  • BCH Broadcast Channel
  • a plurality of system information (System Information) is transmitted by DL-SCH (Downlink Shared Channel).
  • SIBs System Information Blocks 1-8 are mapped to the system information SI.
  • SIB1 includes information necessary for determining whether or not the mobile station UE can wait, such as a PLMN-ID and a cell ID, and is always mapped to first system information SI (System Information) -1.
  • SI System Information
  • SIB2 to SIB8 are grouped and mapped to other system information after SI-2.
  • the SIB is a message including specific information elements, and the SI may be considered as a container for carrying the SIB.
  • the SIB1 mapped to the first system information SI-1 is configured to broadcast scheduling information of other system information after SI-2, so that the transmission cycle T of each SI is broadcasted. It is configured. Further, SIB1 is configured to broadcast SIB-to-SI mapping information.
  • the transmission cycle of the first system information SI-1 is fixed at 80 ms. However, it is possible to repeatedly transmit the first system information SI-1 within 80 ms.
  • the transmission cycle of other system information after SI-2 can be changed, and is assumed to be, for example, about 80 ms to 1.28 s.
  • SI-1 SI-1
  • the transmission subframe is determined in the radio frame).
  • the radio base station eNB may be configured to repeatedly transmit each of the system information SI within the transmission window.
  • SI is transmitted using DL-SCH, so the presence of SI data using the PDCCH (Physical Downlink Control Channel, L1 / L2 control channel), the location of the resource block where SI data is transmitted, etc. This is because only one ID (SI-RNTI, SI Radio Network Temporary Identity) to be notified on the PDCCH is specified in the system.
  • PDCCH Physical Downlink Control Channel, L1 / L2 control channel
  • “Semi-persistent resource allocation” can be applied assuming traffic such as VoIP.
  • a specific resource block can be periodically allocated to a specific mobile station at a specific period. By doing in this way, the overhead of PDCCH can be reduced.
  • Such an allocation method may be referred to as “Persistent scheduling”.
  • the resource block is occupied by the SI, and there is a problem that the resource block cannot be periodically secured.
  • the present invention has been made in view of the above-described problems, and when a plurality of SI-n is mapped to one radio frame in an LTE mobile communication system, the radio base station eNB and the mobile It is an object of the present invention to provide a mobile station and a radio base station that can determine subframes used for transmission of a plurality of SI-n in both stations UE.
  • an object of the present invention is to provide a mobile station and a radio base station that can secure as many resource blocks as possible to which “Persistent scheduling” can be applied.
  • a first feature of the present invention is a radio base station configured to transmit one first system information and one or more other system information to a mobile station,
  • the present invention includes a transmission timing determination unit configured to shift the start position of the transmission window of the other system information by a predetermined interval Y when a plurality of other system information is mapped to the radio frame.
  • the gist is to include a transmission timing determination unit configured to map the other system information to a radio frame.
  • the predetermined interval Y may be a fixed value or a value notified by the first system information.
  • the predetermined interval Y is a time interval corresponding to the number of subframes that is an integral multiple of the number of subframes included in one radio frame, and the size of the transmission window. May be equal to or greater than the time interval corresponding to the number of subframes that can be used for transmission of downlink data corresponding to.
  • the subframe that can be used for transmitting the downlink data may not include a subframe that transmits the first system information.
  • the subframe that can be used for transmitting downlink data may not include a subframe that is used for transmitting uplink data in the TDD scheme.
  • the subframes usable for downlink data transmission include a subframe used for uplink data transmission and a subframe used for downlink data transmission in the TDD scheme. It is not necessary to include the special subframe provided between the two.
  • the subframe that can be used for transmitting downlink data may not include a subframe used for transmitting MBMS data (MBSFN subframe).
  • a third feature of the present invention is a mobile station configured to receive one first system information and one or more other system information from a radio base station, wherein the first system A reception timing determination unit configured to determine a reception radio frame and a reception subframe for the other system information based on the information, the reception timing determination unit for one radio frame
  • the gist is that the start position of the transmission window of the other system information is shifted by a predetermined interval Y.
  • the gist is that it is configured to determine that the other system information is mapped.
  • the predetermined interval Y may be a fixed value or a value notified by the first system information.
  • the predetermined interval Y is a time interval corresponding to the number of subframes that is an integral multiple of the number of subframes included in one radio frame, and the size of the transmission window. May be equal to or greater than the time interval corresponding to the number of subframes that can be used for transmission of downlink data corresponding to.
  • the subframe that can be used for transmitting the downlink data may not include a subframe for transmitting the first system information.
  • the subframe that can be used for transmitting downlink data may not include a subframe that is used for transmitting uplink data in the TDD scheme.
  • the subframes usable for downlink data transmission are subframes used for uplink data transmission in the TDD scheme and special subframes used for downlink data transmission. It is not necessary to include a special subframe provided between and.
  • the subframe that can be used for downlink data transmission may not include a subframe (MBSFN subframe) that is used for MBMS data transmission.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
  • FIG. 3 is a diagram for explaining the System Information transmitted by the radio base station according to the first embodiment of the present invention.
  • FIG. 4 is a diagram for explaining the System Information transmitted by the radio base station according to the first embodiment of the present invention.
  • FIG. 5 is a functional block diagram of the mobile station according to the first embodiment of the present invention.
  • FIG. 6 is a diagram for explaining System Information transmitted by the radio base station according to the second embodiment of the present invention.
  • FIG. 7 is a diagram for explaining the System Information transmitted by the radio base station according to the third embodiment of the present invention.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
  • FIG. 3 is
  • FIG. 8 is a diagram for explaining System Information transmitted by the radio base station according to the fourth embodiment of the present invention.
  • FIG. 9 is a diagram for explaining System Information transmitted by the radio base station according to the fifth embodiment of the present invention.
  • FIG. 10 is a diagram for explaining the System Information transmitted by the radio base station according to the sixth embodiment of the present invention.
  • FIG. 11 is a diagram for explaining the System Information transmitted by the radio base station according to the seventh embodiment of the present invention.
  • FIG. 12 is a diagram for explaining System Information transmitted by the radio base station according to the eighth embodiment of the present invention.
  • FIG. 13 is a diagram for explaining System Information transmitted by the radio base station according to the ninth embodiment of the present invention.
  • FIG. 14 is a diagram for explaining System Information transmitted by the radio base station according to the tenth embodiment of the present invention.
  • the mobile communication system according to the first embodiment of the present invention is an LTE mobile communication system.
  • the radio base station eNB transmits an MIB to the mobile station UE by BCH.
  • BCH base station
  • it is configured to transmit a plurality of system information by DL-SCH.
  • the radio base station eNB provides one first system information SI-1 (SIB1) and one or more other system information SI-2 to the mobile station UE. It is configured to transmit SI-5 (SIB2 to SIB8).
  • SIB1 system information SI-1
  • SI-2 system information SI-2
  • SI-5 SIB2 to SIB8
  • SIB2 to SIB8 to be notified of which SIB is an operational matter, and it is not always necessary to notify all the SIBs.
  • the operator may select the necessary number of SIBs and other system information according to the system operation mode.
  • the radio base station eNB includes a transmission timing determination unit 11 and an SI transmission unit 12.
  • the transmission timing determination unit 11 determines a radio frame for transmission for the other system information SI-2 to SI-5 based on the transmission timing of the first system information SI-1, and is included in the first system information SI-1 Based on the scheduling information, it is configured to determine a transmission subframe in the determined transmission radio frame.
  • a predetermined interval is set.
  • the start position of the transmission window of the other system information SI-2 to SI-5 is shifted by Y.
  • the size of the transmission window of the other system information SI-2 to SI-5 may be a value notified by the first system information SI-1 (SIB1).
  • T is the transmission interval of the other system information SI-2 to SI-5
  • Y is the predetermined interval.
  • the other system information SI-2 to SI-5 is mapped to the radio frame having the frame number SFN in which “ ⁇ Y” is established.
  • the transmission cycle T1 of the first system information SI-1 is “80 ms”
  • the transmission cycle T2 of the second system information SI-2 is “160 ms”
  • the third system information SI ⁇ 3 is “320 ms”
  • the transmission cycle T4 of the fourth system information SI-4 is “640 ms”
  • the transmission cycle T5 of the fifth system information SI-5 is “1280 ms”.
  • the predetermined interval Y may be a fixed value or a value notified by the first system information SI-1 (SIB1).
  • the predetermined interval Y (Window start frame interval) is a time interval corresponding to the number of subframes that is an integral multiple of the number of subframes included in one radio frame.
  • the transmission timing determination unit 11 makes the transmission windows of the other system information SI-2 to SI-4 adjacent to each other. It is configured as follows.
  • the transmission timing determination unit 11 performs other system information SI-2 to SI-4 for one radio frame. The start position of the transmission window is shifted.
  • the transmission timing determination unit 11 performs other system information SI-2 to SI-4 for two radio frames. The start position of the transmission window is shifted.
  • the SI transmission unit 12 is configured to transmit the other system information SI-2 to SI-5 in the transmission subframe determined by the transmission timing determination unit 11.
  • the mobile station UE receives one first system information SI-1 and one or more other system information SI-2 to SI-5 from the radio base station eNB. It is configured.
  • the mobile station UE includes a reception timing determination unit 21 and an SI reception unit 22.
  • the reception timing determination unit 21 is configured to determine a reception radio frame and a reception subframe for the other system information SI-2 to SI-5 based on the first system information SI-1.
  • the start position of the transmission window of the other system information SI-2 to SI-5 is shifted by an interval Y.
  • the SI receiving unit 22 is configured to receive the other system information SI-2 to SI-5 in the reception subframe determined by the reception timing determining unit 21.
  • the predetermined interval Y can be set to a period for assigning resource blocks (for example, a 20 ms period in which a VoIP packet arrives) in “Persistent scheduling”. By doing in this way, it is possible to secure more resource blocks to which “Persistent scheduling” can be applied.
  • the cycle in which resource blocks are to be allocated may differ depending on the traffic.
  • the predetermined period Y may be 20 ms or an integer multiple of 20 ms.
  • packets arrive at a 30 ms period or a 40 ms period.
  • the predetermined cycle Y may be 40 ms or an integer multiple of 40 ms.
  • the predetermined period Y when the predetermined period Y is set to “0”, the SI transmission windows are adjacent to each other. Since the transmission windows are adjacent, the mobile station can receive SIs in a shorter period of time when receiving all SIs. This is desirable for battery saving.
  • the predetermined period Y can be set to “0” to give priority to battery saving.
  • the value of the predetermined cycle Y can be reported using SI-1 (SIB1).
  • Mobile communication system according to the second embodiment of the present invention With reference to FIG. 6, the mobile communication system according to the second embodiment of the present invention will be described by focusing on the differences from the mobile communication system according to the first embodiment described above.
  • the predetermined interval Y (Window start frame interval) is a time interval corresponding to the number of subframes that is an integral multiple of the number of subframes included in one radio frame. And a time interval corresponding to the number of subframes that can be used for transmission of downlink data corresponding to the transmission window size of each of the other system information SI-2 to SI-4.
  • the size of the transmission window of each other system information SI-2 to SI-4 is “5”.
  • the transmission window of each of the other system information SI-2 to SI-4 includes five subframes that can be used for downlink data transmission.
  • Subframe # 5 in which information SI-1 is transmitted is excluded from subframes that can be used for transmission of such downlink data.
  • the subframe that can be used for transmitting the downlink data may not include a subframe (MBSFN subframe) that is used for transmitting the MBMS data.
  • MMSFN subframe a subframe that is used for transmitting the MBMS data.
  • the MBSFN subframe is a subframe for applying the MBSFN transmission method that increases the reception power by transmitting the same data while synchronizing in a plurality of cells. This is because it cannot be transmitted.
  • the first five subframes are reserved as a transmission window for other system information SI-2.
  • the transmission window of other system information SI-3 is equivalent to 5 subframes + 1 subframe. The start position is shifted.
  • the transmission timing determination unit 11 performs other system information SI-2 to SI-4 for two radio frames. The start position of the transmission window is shifted.
  • the transmission timing determination unit 11 performs other system information SI-2 to SI-4 for three radio frames. The start position of the transmission window is shifted.
  • Mobile communication system according to the third embodiment of the present invention With reference to FIG. 7, the mobile communication system according to the third embodiment of the present invention will be described while focusing on the differences from the mobile communication system according to the first embodiment described above.
  • the mobile communication system according to the present embodiment is the same as the mobile communication system according to the first embodiment described above except that the TDD scheme is applied.
  • Mobile communication system according to the fourth embodiment of the present invention With reference to FIG. 8, a mobile communication system according to a fourth embodiment of the present invention will be described focusing on differences from the mobile communication system according to the second embodiment described above.
  • the TDD scheme is applied in the mobile communication system according to the present embodiment.
  • the predetermined interval Y (Window start frame interval) is a time interval corresponding to the number of subframes that is an integral multiple of the number of subframes included in one radio frame. And a time interval corresponding to the number of subframes that can be used for transmission of downlink data corresponding to the transmission window size of each of the other system information SI-2 to SI-4.
  • the size of the transmission window of each other system information SI-2 to SI-4 is “5”.
  • the transmission window of each of the other system information SI-2 to SI-4 includes five subframes that can be used for downlink data transmission.
  • the subframes that can be used for transmission of downlink data do not include the subframes that are used for transmission of uplink data (subframes # 2 to # 4 and # 7 to # 9 in the example of FIG. 8). May be.
  • a subframe that can be used for transmission of downlink data is a special subframe (see FIG. 5) provided between a subframe that is used for transmission of uplink data and a subframe that is used for transmission of downlink data in the TDD scheme.
  • subframes # 1 and # 6) may not be included.
  • the special subframe is a subframe provided with uplink and downlink guard intervals in the TDD scheme, and although it is for downlink transmission, the number of usable symbols is remarkably limited, and the number of symbols is too small to transmit SI. This is because there are cases.
  • the subframe that can be used for transmitting the downlink data may not include the subframe in which the first system information SI-1 is transmitted (subframe # 5 in the example of FIG. 8).
  • the subframe that can be used for transmitting the downlink data may not include a subframe (MBSFN subframe) that is used for transmitting the MBMS data.
  • MMSFN subframe a subframe that is used for transmitting the MBMS data.
  • Mobile communication system according to the fifth embodiment of the present invention With reference to FIG. 9, a mobile communication system according to a fifth embodiment of the present invention will be described focusing on differences from the above-described mobile communication system according to the first embodiment.
  • the FDD scheme is applied in the mobile communication system according to the present embodiment.
  • the mobile communication system according to the present embodiment is configured such that the transmission windows of the other system information SI-2 to SI-5 are adjacent to each other.
  • Mobile communication system according to the sixth embodiment of the present invention With reference to FIG. 10, a mobile communication system according to a sixth embodiment of the present invention will be described focusing on differences from the above-described mobile communication system according to the first embodiment.
  • the FDD scheme is applied in the mobile communication system according to the present embodiment.
  • the first five subframes are reserved as a transmission window for other system information SI-2.
  • the predetermined interval Y (Window start frame interval) is a downlink corresponding to the size of the transmission window of each other system information SI-2 to SI-4. This is a time interval corresponding to the number of subframes that can be used for data transmission.
  • the predetermined interval Y (Window start frame interval) corresponds to the number of subframes that is an integral multiple of the number of subframes included in one radio frame. It may not be a time interval.
  • the number corresponding to the size of the transmission window of each other system information SI-2 to SI-4 is included in the transmission window of each other system information SI-2 to SI-4.
  • a subframe that can be used for transmission of downlink data may not be included.
  • Mobile communication system according to the seventh embodiment of the present invention With reference to FIG. 11, the mobile communication system according to the sixth embodiment of the present invention will be described focusing on the differences from the mobile communication system according to the first embodiment described above.
  • the FDD scheme is applied in the mobile communication system according to the present embodiment.
  • the first five subframes are reserved as a transmission window for other system information SI-2.
  • the predetermined interval Y (Window start frame interval) is a downlink corresponding to the size of the transmission window of each other system information SI-2 to SI-4. This is a time interval corresponding to the number of subframes that can be used for data transmission.
  • the predetermined interval Y (Window start frame interval) corresponds to the number of subframes that is an integral multiple of the number of subframes included in one radio frame. It may not be a time interval.
  • the number corresponding to the size of the transmission window of each other system information SI-2 to SI-4 is included in the transmission window of each other system information SI-2 to SI-4.
  • a subframe that can be used for transmission of downlink data is included.
  • Mobile communication system according to the eighth embodiment of the present invention With reference to FIG. 12, a mobile communication system according to an eighth embodiment of the present invention will be described focusing on differences from the mobile communication system according to the fifth embodiment described above.
  • the mobile communication system according to the present embodiment is the same as the mobile communication system according to the fifth embodiment described above except that the TDD scheme is applied.
  • Mobile communication system according to the ninth embodiment of the present invention With reference to FIG. 13, the mobile communication system according to the ninth embodiment of the present invention will be described focusing on the differences from the mobile communication system according to the sixth embodiment described above.
  • the mobile communication system according to the present embodiment is the same as the mobile communication system according to the sixth embodiment described above except that the TDD scheme is applied.
  • subframe # 5 is used for transmission of SI-1, and cannot be used for transmission of other system information SI. Therefore, subframe # 5 is skipped and the SI-3 transmission window is started from subframe # 6.
  • At least one subframe always includes a subframe in which downlink data transmission is possible in the SI transmission window.
  • Mobile communication system according to the tenth embodiment of the present invention With reference to FIG. 14, the mobile communication system according to the tenth embodiment of the present invention will be described focusing on the differences from the mobile communication system according to the seventh embodiment.
  • the mobile communication system according to the present embodiment is the same as the mobile communication system according to the seventh embodiment described above except that the TDD scheme is applied.
  • the SI transmission window always includes a predetermined number (5 in the example of FIG. 14) of subframes capable of transmitting downlink data. It is defined that an uplink transmission subframe, a special subframe, and a subframe in which SI-1 is transmitted are not included in a subframe in which downlink data can be transmitted.
  • a predetermined number of subframes can always be used for SI transmission, and retransmission of the same SI can be performed as many times as necessary within the SI transmission window.
  • the software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM).
  • RAM Random Access Memory
  • flash memory ROM (Read Only Memory)
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM.
  • it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
  • Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE or the radio base station eNB. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE or the radio base station eNB.
  • both the radio base station eNB and the mobile station UE it is possible to provide a mobile station and a radio base station that can determine a subframe used for transmission of such a plurality of SI-n.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

L'invention porte sur une station de base radio (eNB) qui comprend une unité de décision de synchronisation d'émission (11) qui décale une position de début d'une fenêtre de transmission d'autres informations systèmes SI-n par un intervalle prédéterminé Y lorsqu'une pluralité d'autres informations systèmes SI-n sont mappées pour une seule trame radio.
PCT/JP2009/057487 2008-04-17 2009-04-14 Station de base radio et station mobile WO2009128438A1 (fr)

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JP2008-108390 2008-04-17
JP2008108390A JP5162311B2 (ja) 2008-04-17 2008-04-17 無線基地局及び移動局

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WO2009128438A1 true WO2009128438A1 (fr) 2009-10-22

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WO2013035468A1 (fr) * 2011-09-09 2013-03-14 株式会社エヌ・ティ・ティ・ドコモ Station de base et procédé de commande de communication
WO2016186007A1 (fr) * 2015-05-15 2016-11-24 株式会社Ｎｔｔドコモ Station de base, dispositif d'utilisateur et procédé de transmission/réception d'informations de diffusion

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KR20100113435A (ko) * 2009-04-13 2010-10-21 삼성전자주식회사 광대역 무선통신 시스템에서 시스템 정보 블록 송신 장치 및 방법
JP5576433B2 (ja) * 2012-06-08 2014-08-20 株式会社Ｎｔｔドコモ 無線基地局及び無線リソース割り当て方法
CN108029110B (zh) 2015-10-29 2022-08-09 瑞典爱立信有限公司 按需广播系统信息的方法和设备
EP3691340B1 (fr) 2017-01-04 2021-06-02 Telefonaktiebolaget LM Ericsson (publ) Procédé, station de base et équipement utilisateur permettant d'émettre et de recevoir des informations de système

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NTT DOCOMO: "offsetting SI transmission SFN", 3GPP TSG RAN WG2 #61BIS, TDOC- R2-081740, 4 April 2008 (2008-04-04), Retrieved from the Internet <URL:ftp://ftp.3gpp.org/tsg_ran/WG2_RL2/TSGR2_61bis/Docs/R2-081740.zip> [retrieved on 20090707] *

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WO2013035468A1 (fr) * 2011-09-09 2013-03-14 株式会社エヌ・ティ・ティ・ドコモ Station de base et procédé de commande de communication
JP2013059002A (ja) * 2011-09-09 2013-03-28 Ntt Docomo Inc 基地局及び通信制御方法
WO2016186007A1 (fr) * 2015-05-15 2016-11-24 株式会社Ｎｔｔドコモ Station de base, dispositif d'utilisateur et procédé de transmission/réception d'informations de diffusion
JP2016219927A (ja) * 2015-05-15 2016-12-22 株式会社Ｎｔｔドコモ 基地局、ユーザ装置及び報知情報送受信方法
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
CN107615865B (zh) * 2015-05-15 2021-07-06 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
US11337142B2 (en) 2015-05-15 2022-05-17 Ntt Docomo, Inc. Base station, user equipment and broadcast information transmission and reception method

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