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WO2013133373A1 - Station mobile et station de base sans fil - Google Patents

Station mobile et station de base sans fil Download PDF

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Publication number
WO2013133373A1
WO2013133373A1 PCT/JP2013/056279 JP2013056279W WO2013133373A1 WO 2013133373 A1 WO2013133373 A1 WO 2013133373A1 JP 2013056279 W JP2013056279 W JP 2013056279W WO 2013133373 A1 WO2013133373 A1 WO 2013133373A1
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WO
WIPO (PCT)
Prior art keywords
combination
mobile station
frequency bands
frequency band
carrier
Prior art date
Application number
PCT/JP2013/056279
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English (en)
Japanese (ja)
Inventor
佑太 寒河江
高橋　秀明
アニール ウメシュ
耕平 清嶋
Original Assignee
株式会社エヌ・ティ・ティ・ドコモ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 株式会社エヌ・ティ・ティ・ドコモ filed Critical 株式会社エヌ・ティ・ティ・ドコモ
Publication of WO2013133373A1 publication Critical patent/WO2013133373A1/fr

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

Definitions

  • the present invention relates to a mobile station and a radio base station.
  • the mobile station UE can perform CA with a single radio base station eNB using a plurality of “Component Carriers (CC)” in different frequency bands at the same time. It is configured as follows.
  • the mobile station UE sets one of a plurality of CCs as a PCC (Primary Component Carrer) and the other as a SCC (Secondary Component Carrer) in response to an instruction from the radio base station. ) Is configured to set as.
  • PCC Primary Component Carrer
  • SCC Secondary Component Carrer
  • the mobile station UE is included in the “Supported CC Bandwidth Combinations” that it supports in the “Band Combination” that it supports.
  • the mobile station UE is included in the “Supported CC Bandwidth Combinations” that it supports in the “Band Combination” that it supports.
  • the mobile station UE when the mobile station UE is operated with a combination of CC bandwidths that are not targeted, the mobile station UE cannot receive broadcast information in the specific frequency band. There was a possibility.
  • the present invention has been made in view of the above-described problem, and when CA is operated in a specific frequency band, as a combination of CC bandwidths included in the combination of the corresponding frequency bands, Provided are a mobile station and a radio base station that can appropriately receive broadcast information in a state where CA is performed in such a specific frequency band even if the operation is performed with a combination of non-CC bandwidths For the purpose.
  • the first feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed are defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined.
  • the carrier in the first frequency band or the second frequency band is to include a receiving unit configured to receive broadcast information in the center bandwidth of the carrier.
  • the second feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed is defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined.
  • the mobile station supports at least one of the combinations of carrier bandwidths in the plurality of frequency bands, broadcast in the serving cell of the main carrier of the mobile station via dedicated signaling
  • the gist of the invention is to include a receiving unit configured to receive information.
  • the third feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed is defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined.
  • the main carrier of the mobile station is to include a receiving unit configured to receive broadcast information in the serving cell.
  • the fourth feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed are defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined.
  • the mobile station supports at least one of the bandwidth combinations of carriers in the plurality of frequency bands, after canceling the CA set for the mobile station.
  • the gist of the invention is that the mobile station includes a receiving unit configured to receive broadcast information in a serving cell of a main carrier of the mobile station.
  • the fifth feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed are defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined
  • the gist of the present invention is to include a transmission unit configured to transmit broadcast information in the center bandwidth of the carrier in the first frequency band or the carrier in the second frequency band.
  • the sixth aspect of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed is defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined
  • the mobile station supports at least one of the combinations of the bandwidths of the carriers in the plurality of frequency bands, the main station of the mobile station is transmitted to the mobile station by dedicated signaling.
  • the gist is to include a transmission unit configured to transmit broadcast information in a carrier serving cell.
  • the seventh feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed is defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined
  • the mobile station supports at least one of the combinations of carrier bandwidths in the plurality of frequency bands, when the inter-cell handover is performed, the mobile station
  • the gist of the invention is that it comprises a transmission unit configured to transmit broadcast information in the serving cell of the main carrier of the mobile station.
  • the eighth feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed are defined.
  • a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined
  • the mobile station supports at least one of the bandwidth combinations of carriers in the plurality of frequency bands, after canceling the CA set for the mobile station, It comprises a transmitter configured to transmit broadcast information in a serving cell of a main carrier of the mobile station to the mobile station.
  • 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 mobile station according to the first embodiment of the present invention.
  • FIG. 3 is a diagram for explaining an example of a combination of CAs that can be realized in the mobile communication system according to the first embodiment of the present invention.
  • FIG. 4 is a diagram for explaining functions of the receiving unit of the mobile station according to the first embodiment of the present invention.
  • FIG. 5 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
  • FIG. 6 is a diagram for explaining the operation of the mobile station according to the first embodiment of the present invention.
  • FIG. 7 is a diagram for explaining a mobile communication system according to the second embodiment of the present invention.
  • the mobile communication system according to the present embodiment is an LTE-Advanced mobile communication system.
  • the mobile station UE can transmit and receive signals to and from the radio base station eNB by simultaneously using the CC of the frequency band F1 and the CC of the frequency band F2. That is, it is comprised so that CA can be performed.
  • the CC of the frequency band F1 is set as “PCC” and the CC of the frequency band F2 is set as “SCC” for the mobile station UE. It shall be.
  • the mobile station UE includes a management unit 11, a transmission unit 12, and a reception unit.
  • the management unit 11 is configured to manage a combination of frequency bands that the mobile station UE corresponds to among combinations of frequency bands that can perform CA (“E-UTRA Band Combination” illustrated in FIG. 3). .
  • the management unit 11 includes a combination of CC bandwidths within a frequency band in which CA can be performed in a combination of frequency bands supported by the mobile station UE ("Supported CC Bandwidth Combinations" illustrated in FIG. 3).
  • the mobile station UE is configured to manage a combination of corresponding bandwidths.
  • E-UTRA Band Combination and “Supported CC Bandwidth Combinations” may be defined as shown in FIG.
  • a plurality of “Supported CC Bandwidth Combinations” can be defined for one “E-UTRA Band Combination”.
  • the management unit 11 has a combination of “E-UTRA Band # 5” and “E-UTRA Band # 1” as “E-UTRA Band Combination” supported by the mobile station UE (“5, shown in FIG. 3). 1 ”) may be managed.
  • the management unit 11 sets “Supported CC Bandwidth Combinations” supported by the mobile station UE in the downlink as “10 MHz” in “E-UTRA Band # 5” and “10 MHz in“ E-UTRA Band # 1 ”. ”(“ DL: 10 + 10 ”shown in FIG. 3) may be managed.
  • the management unit 11 may be configured to manage the same combination as the downlink as “Supported CC Bandwidth Combinations” that the mobile station UE supports in the uplink.
  • the transmission unit 12 is configured to transmit various signals to the radio base station eNB with which the mobile station UE is communicating.
  • the transmission unit 12 when the mobile station UE supports at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, the transmission unit 12 Thus, instead of “Supported CC Bandwidth Combinations” supported by the mobile station UE, the mobile station UE is configured to notify the maximum amount of data that can be processed within a predetermined period.
  • the predetermined period may be a predetermined number (for example, one) subframes or a predetermined number (for example, one) TTI (Transmission Time Interval).
  • the transmission unit 12 may be configured to notify the number of resource blocks as the above-described maximum data amount.
  • the transmission unit 12 may be configured to notify the maximum data amount by a predetermined bit in “UE Capability (capability information)”.
  • the receiving unit 13 is configured to receive various signals from the radio base station eNB with which the mobile station UE is communicating.
  • the receiving unit 13 is configured to receive control information including scheduling information, broadcast information, downlink data, and the like from the radio base station eNB.
  • the receiving unit 12 corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, “E-UTRA Band” that can be used for CA is used. Control information transmitted via the PDCCH may be received in the entire bandwidth of the CC in “# 5” and “E-UTRA Band # 1”.
  • the mobile station UE transmits “Supported CC Bandwidth Combinations” as “Supported CC Bandwidth Combinations” as “10 MHz” and “E-UTRA Band # 1” in “E-UTRA Band # 5”.
  • a CC having a bandwidth of “10 MHz” is used in “E-UTRA Band # 5” even when the combination of “10 MHz” is supported.
  • the receiving unit 13 transmits the data via the PDCCH as shown in FIG. For the control information to be used, in the full bandwidth of “20 MHz” of CC in “E-UTRA Band # 1” It may be configured to trust.
  • control information transmitted via the PDCCH is allocated to the entire bandwidth of each CC, since the transmission rate is generally low, the receiving unit 13 can use “E ⁇ Even if control information transmitted via PDCCH is received in the entire bandwidth of CC in “UTRA Band # 5” and “E-UTRA Band # 1”, the processing load does not increase dramatically. .
  • the receiving unit 13 can receive the total of the downlink data size transmitted in the PCC and the downlink data size transmitted in the SCC at the corresponding mobile station UE.
  • the maximum data size may be configured to receive downlink data via the PDSCH.
  • CC in “E-UTRA Band # 5” is set as “PCC” for the mobile station UE, and “E-UTRA Band # 1” is set as “SCC”. Let us consider a case in which the CC is set.
  • a CC with a bandwidth of “10 MHz” is used in “E-UTRA Band # 5”
  • a CC with a bandwidth of “20 MHz” is used in “E-UTRA Band # 1”.
  • the receiving unit 13 of the mobile station UE that can handle a bandwidth of “20 MHz” can receive downlink data via the PDSCH on the CC (SCC) in the “E-UTRA Band # 1”.
  • reception unit 13 supports at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, “E-UTRA Band # 5” and “E -You may be comprised so that the alerting
  • center bandwidth for example, center 28 resource block
  • the broadcast information may be assigned by the “Distributed” assignment method or may be assigned by the “Localized” assignment method.
  • the receiving unit 13 is compatible with at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, via individual signaling from the radio base station eNB.
  • Pcell PCC serving cell
  • Scell SCC serving cell
  • broadcast information MIB (Master Information Block), SIB (System Information Block), etc.
  • MIB Master Information Block
  • SIB System Information Block
  • the receiving unit 13 corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, the receiving unit 13 performs Pcell during “Inter-cell Handover”. And broadcast information in Scell may be received.
  • the reception unit 13 is a CA that is set for the mobile station UE when it corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment. After ending once, it may be configured to receive broadcast information in Pcell and Scell, and then resume such CA.
  • the radio base station eNB includes a reception unit 21, a scheduling unit 22, and a transmission unit 23.
  • the receiving unit 21 is configured to receive various signals from the mobile station UE in communication with the radio base station eNB.
  • the receiving unit 21 is configured to receive the above-described “UE Capability” or the like from the mobile station UE.
  • the scheduling unit 22 is configured to perform scheduling processing for the mobile station UE.
  • the scheduling unit 22 may be configured to perform scheduling processing for the mobile station UE based on the above-described maximum data amount (for example, the number of resource blocks) acquired from the mobile station UE.
  • the scheduling unit 22 allocates resources for transmitting downlink data up to the bandwidth corresponding to the mobile station UE in the PCC of the mobile station UE, and allocates resources for transmitting the remaining downlink data in the SCC of the mobile station UE. It may be configured to allocate.
  • the scheduling unit 22 determines the CC bandwidth that the mobile station UE can receive based on the maximum transmission rate determined based on the “UE Category” of the mobile station UE and the MCS (Modulation and Coding Scheme) used for transmission. And scheduling processing may be performed based on the bandwidth.
  • MCS Modulation and Coding Scheme
  • the scheduling unit 22 may allocate the total so as to have a maximum width of 20 MHz.
  • the transmission unit 23 is configured to transmit various signals to the mobile station UE in communication with the radio base station eNB.
  • the transmission unit 23 is configured to transmit scheduling information of downlink data in Pcell and Scell to the mobile station UE via PDCCH on the PCC and SCC of the mobile station UE, respectively. Also good.
  • the transmission unit 23 may be configured to transmit broadcast information to the mobile station UE using the central bandwidth of the PCC and SCC (for example, the central 28 resource blocks).
  • the transmission part 23 may be comprised so that the alerting
  • an information element for transmitting broadcast information in Scell that is, an information element “RRC Reconfiguration message” defined in 6.2.2 of TS36.331 of 3GPP “ScellAddMod” may be extended and used.
  • the transmission unit 23 may be configured to transmit broadcast information in the Pcell and Scell during “Inter-cell Handover”.
  • the transmission unit 23 may be configured to once cancel the CA set for the mobile station UE in order to transmit the broadcast information in the Pcell.
  • the transmission unit 23 when the transmission unit 23 detects that it is necessary to change the broadcast information in the Pcell, after canceling the CA set for the target mobile station UE, the transmission unit 23 changes the broadcast information in the Pcell to be transmitted. After a predetermined period of time, the CA may be set again for the mobile station UE.
  • the transmission unit 23 is configured to transmit downlink data to the mobile station UE via the PDSCH based on the result of the above scheduling process on the PCC and SCC of the mobile station UE. May be.
  • step S101 the mobile station UE receives the control information described above via the PDCCH in the entire bandwidth of the CC set as the PCC and SCC of the mobile station UE.
  • step S102 the mobile station UE receives broadcast information in Pcell and broadcast information in Scell.
  • step S103 the mobile station UE receives downlink data via the PDSCH on the PCC or SCC based on the control information and the broadcast information.
  • the mobile station UE uses the bandwidth of the CC included in the “Supported CC Bandwidth Combinations” that it supports in the “Band Combination” that it supports.
  • Control information transmitted via the PDCCH can be received in all the PCC and SCC bandwidths set for the mobile station UE, even when the CC is operated with a large bandwidth CC. CA can be appropriately performed.
  • Mobile communication system according to the second embodiment of the present invention A mobile communication system according to the second embodiment of the present invention will be described with reference to FIG.
  • the mobile communication system according to the second embodiment of the present invention will be described by focusing on differences from the above-described mobile communication system according to the first embodiment.
  • the receiving unit 13 of the mobile station UE corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment. If so, it is configured to receive control information transmitted using a part of bandwidth in CC in “E-UTRA Band # 5” or CC in “E-UTRA Band # 1” Has been.
  • the receiving unit 13 may be configured to receive control information via an E-PDCCH (Enhanced-Physical Downlink Control Channel).
  • E-PDCCH Enhanced-Physical Downlink Control Channel
  • the transmission unit 23 of the radio base station eNB performs CC in “E-UTRA Band # 5” or CC in “E-UTRA Band # 1”.
  • the mobile station UE is configured to transmit control information via the E-PDCCH.
  • E-PDCCH is a channel that has been studied for introduction by the LTE (Release-11) method in order to solve the problem of insufficient capacity of PDCCH.
  • the transmission unit 13 may be configured to allocate E-PDCCH transmission resources in the PDSCH transmission resource allocation area.
  • the receiving unit 13 demodulates the E-PDCCH using DM-RS (Demodulation Reference Signal) unique to the mobile station UE.
  • DM-RS Demodulation Reference Signal
  • the transmission unit 23 may be configured to allocate E-PDCCH transmission resources by the “Localized Transmission” method, as shown in FIG. 7B.
  • the transmission resource of the E-PDCCH may be allocated by the “Distributed Transmission” method.
  • the first feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within a frequency band capable of performing CA (Supported CC Bandwidth).
  • a receiving unit 13 configured to receive broadcast information.
  • the second feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within a frequency band capable of performing CA (Supported CC Bandwidth).
  • a receiving unit 13 configured to receive broadcast information in Pcell of the mobile station UE (the serving cell for the main carrier).
  • a third feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within a frequency band capable of performing CA (Supported CC Bandwidth).
  • a first frequency band for example, E-UTRA Band # 5
  • a second frequency band for example, E -A combination of UTRA Band # 1
  • a combination of CC bandwidths in a plurality of frequency bands is specified, and the mobile station UE has CCs in the plurality of frequency bands.
  • the fourth feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within the frequency band capable of performing CA (Supported CC Bandwidth).
  • the mobile station UE includes the receiving unit 13 configured to receive the broadcast information in the Pcell. .
  • the fifth feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within a frequency band capable of performing CA (Supported CC Bandwidth).
  • a radio base station eNB used in a mobile communication system in which a combination is defined, and as a combination of such frequency bands, a first frequency band (for example, E-UTRA Band # 5) and a second frequency band (for example, If a combination of E-UTRA Band # 1) is specified and a combination of CC bandwidths in a plurality of frequency bands is specified, the CC in the first frequency band or the second frequency band Broadcast information is transmitted in the center bandwidth of CC And summarized in that comprises a transmitter 23 that is configured to.
  • a sixth feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within a frequency band capable of performing CA (Supported CC Bandwidth).
  • the seventh feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within the frequency band capable of performing CA (Supported CC Bandwidth).
  • At least one of the bandwidth combinations When it responds, when “Inter-Cell Handover (inter-cell handover)” is performed, broadcast information in the Pcell of the mobile station UE is transmitted to the mobile station UE.
  • the gist is that the transmitter 23 is provided.
  • the eighth feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of CC bandwidths within a frequency band capable of performing CA (Supported CC Bandwidth).
  • the operations of the mobile station UE and the radio base station eNB described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .
  • Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium such as a CD-ROM.
  • the 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. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE and the radio base station eNB. Moreover, this storage medium and processor may be provided in the mobile station UE and the radio base station eNB as a discrete component.
  • the present invention when a CA is operated in a specific frequency band, as a combination of CC bandwidths included in the combination of the corresponding frequency bands, even if the operation is performed in combination, it is possible to provide a mobile station and a radio base station that can appropriately receive broadcast information in a state where CA is performed in the specific frequency band.
  • UE ... mobile station eNB ... radio base station 11 ... management unit 12, 23 ... transmission unit 13, 21 ... reception unit 22 ... scheduling unit

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

Abstract

La présente invention a pour objet de permettre la réception adéquate d'informations de notification, dans un état dans lequel une agrégation de porteuses (CA) est exécutée, dans une largeur de bande de fréquence prédéterminée, même si, lorsqu'une CA est appliquée dans la largeur de bande de fréquence prédéterminée, une combinaison de largeurs de bande de porteuses composantes (CC), qui n'est pas une cible, est utilisée pour l'application de CA, ladite combinaison de largeurs de bande de CC étant une combinaison de largeurs de bande de CC incluses dans une combinaison pour la largeur de bande de fréquence prédéterminée. Une station mobile (UE) selon la présente invention est équipée d'une unité de réception (13) qui est configurée de manière à recevoir des informations de notification dans une largeur de bande centrale d'une CC dans une première largeur de bande de fréquence et d'une CC dans une seconde largeur de bande de fréquence, lorsqu'une combinaison de la première largeur de bande de fréquence et de la seconde largeur de bande de fréquence a été spécifiée à titre de combinaison de largeurs de bande de fréquence dans laquelle une CA peut être exécutée, et une combinaison de largeurs de bande de porteuses dans une pluralité de largeurs de bande de fréquence a été spécifiée, et la station mobile (UE) est compatible avec au moins une combinaison de largeurs de bande de porteuses dans la pluralité de largeurs de bande de fréquence.
PCT/JP2013/056279 2012-03-07 2013-03-07 Station mobile et station de base sans fil WO2013133373A1 (fr)

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JP2012-050411 2012-03-07
JP2012050411A JP6032904B2 (ja) 2012-03-07 2012-03-07 移動局および無線基地局

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KR102146450B1 (ko) * 2014-03-10 2020-08-20 에스케이텔레콤 주식회사 통신 단말 장치와 그 핸드오버 방법
KR101877853B1 (ko) * 2014-09-26 2018-07-12 에스케이텔레콤 주식회사 기지국장치 및 기지국장치의 동작 방법

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