WO2011034022A1 - Radio base station - Google Patents

Radio base station Download PDF

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Publication number
WO2011034022A1
WO2011034022A1 PCT/JP2010/065727 JP2010065727W WO2011034022A1 WO 2011034022 A1 WO2011034022 A1 WO 2011034022A1 JP 2010065727 W JP2010065727 W JP 2010065727W WO 2011034022 A1 WO2011034022 A1 WO 2011034022A1
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WIPO (PCT)
Prior art keywords
card
base station
radio base
communication
area
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PCT/JP2010/065727
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French (fr)
Japanese (ja)
Inventor
耕平 清嶋
啓之 石井
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株式会社エヌ・ティ・ティ・ドコモ
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Publication of WO2011034022A1 publication Critical patent/WO2011034022A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • 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 radio base station.
  • a radio base station NodeB communicates with a plurality of mobile stations UE using individual channels in a plurality of carriers (for example, 4 carriers in a 5 MHz band). Is configured to do.
  • a radio base station eNB communicates with a plurality of mobile stations UE using a shared channel in one carrier (for example, one carrier in a 20 MHz band). It may be configured to perform.
  • the radio base station NodeB and the radio base station eNB are configured to be able to provide a mobile communication service to a plurality of sectors (or cells).
  • the radio base station NodeB and the radio base station eNB include one or a plurality of BB (Baseband) cards, and each BB card can perform communication processing in one or a plurality of sectors. It is configured.
  • BB Baseband
  • the mobile station UE located in the sector # 1 is communicated by a BB card other than the BB card # 1.
  • BB card other than the BB card # 1.
  • mobile communication service is provided by one carrier, There is a problem that the mobile communication service cannot be continuously provided to the mobile station UE located in the sector # 1 as in the W-CDMA mobile communication system.
  • the present invention has been made in view of the above-described problems, and a failure has occurred in a BB card in a mobile communication system in which a mobile communication service is provided by one carrier as in an LTE mobile communication system. Even if it is a case, it aims at providing the radio base station which can continue provision of a mobile communication service with respect to the mobile station located in the sector in which communication processing is performed by this BB card.
  • a first feature of the present invention is a radio base station configured to perform communication with a plurality of mobile stations using a shared channel in one carrier of a predetermined frequency band, wherein the first area A first communication card configured to perform communication processing in the second area, a second communication card configured to perform communication processing in the second area, and the first communication card and the second communication card. And when the controller detects a failure in the first communication card, the second communication card is connected to the first area and the first area.
  • the gist is that one or a plurality of restrictions are added to the communication processing performed by the second communication card so that the communication processing in two areas can be performed.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a functional block diagram of a BB card included in the radio base station according to the first embodiment of the present invention.
  • 5 is a flowchart showing an operation of the radio base station according to the first embodiment of the present invention.
  • the mobile communication system according to the present embodiment is an LTE mobile communication system.
  • the radio base station eNB includes sectors A0 to AB (first area) belonging to the sector group Agroup and sectors C0 to CD (second area) belonging to the sector group Cgroup. It is configured to communicate with the mobile station UE located in the area.
  • the radio base station eNB communicates with a plurality of mobile stations UE in a shared channel within one carrier in a predetermined system frequency band, specifically, PUSCH (Physical Uplink Shared Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Channel, etc.) and PDCCH (Physical Downlink Control CHR), PDCCH (Physical Downlink Control CHR).
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • PUCCH Physical Uplink Channel, etc.
  • PDCCH Physical Downlink Control CHR
  • PDCCH Physical Downlink Control CHR
  • the radio base station eNB includes a control unit 11, an upper node interface 12, and a plurality of BB cards #A, #C,.
  • the control unit 11 is configured to control a plurality of BB cards #A, #C.
  • the upper node interface 12 is configured to function as an interface with upper nodes such as the switching center MME and the serving gateway device S-GW.
  • Each BB node is configured to perform communication processing in a predetermined area (specifically, one or a plurality of sectors or cells).
  • communication processing includes encoding processing, modulation processing, demodulation processing, decoding processing, scheduling processing, and the like.
  • the BB card #A (first communication card) is configured to perform communication processing in the sectors A0 to AB belonging to the sector group Agroup
  • the BB card #C (second communication card). Are configured to perform communication processing in sectors C0 to CD belonging to the sector group Cgroup.
  • the BB card #A and the BB card #C include a control unit interface 21, an encoding processing unit 22, a modulation processing unit 23, a transmission unit 24, a reception unit 25, and a demodulation processing unit. 26, a decoding processing unit 27, a failure detection unit 28, and a scheduling unit 29.
  • the control unit interface 21 is configured to function as an interface with the control unit 11.
  • the encoding processing unit 22 is configured to perform an encoding process on the output signal from the control unit interface 21.
  • the modulation processing unit 23 is configured to perform modulation processing on the output signal from the encoding processing unit 22.
  • the transmission unit 24 transmits the output signal from the modulation processing unit 23 to a predetermined area such as sectors A0 to AB belonging to the sector group Agroup and sectors C0 to CD belonging to the sector group Cgroup via the transmission antenna. It is configured.
  • the receiving unit 25 is configured to receive a signal from the mobile station UE located in a predetermined area such as the sectors A0 to AB belonging to the sector group Agroup and the sectors C0 to CD belonging to the sector group Cgroup via the receiving antenna. Has been.
  • the demodulation processing unit 26 is configured to perform demodulation processing on the output signal from the receiving unit 25.
  • the decoding processing unit 27 is configured to perform decoding processing on the output signal from the demodulation processing unit 26.
  • the output signal from the decoding processing unit 27 is configured to be transmitted to the control unit 11 via the control unit interface 21.
  • the failure detection unit 28 is configured to detect the occurrence of a failure in the BB card #A and the BB card #C. Here, when detecting the occurrence of a failure in the BB card #A and the BB card #C, the failure detection unit 28 is configured to notify the control unit 11 via the control unit interface 21. .
  • the scheduling unit 29 is configured to perform a scheduling process on the mobile station UE located in a predetermined area such as sectors A0 to AB belonging to the sector group Agroup and sectors C0 to CD belonging to the sector group Cgroup.
  • the controller 11 detects the occurrence of a failure in the BB card #A or BB card #C
  • the BB card #C or BB card #A performs communication processing in the sectors A0 to AB and sectors C0 to CD.
  • the communication processing performed by the BB card #C or the BB card #A is configured to add one or more restrictions.
  • control unit 11 when the control unit 11 detects the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 determines that the BB card #C or the BB card #A has the sectors A0 to AB. In addition, it may be configured to increase the limit added to the communication processing performed by the BB card #C or the BB card #A until the communication processing in the sectors C0 to CD can be performed.
  • the first limit is a limit on the number of resource blocks that can be allocated within one subframe.
  • one radio frame (Radio Frame) is composed of 20 slots, and the time length of one radio frame is 10 ms (that is, the time length of one slot is 0.5 ms), 1 A subframe is composed of 2 slots, the time length of 1 subframe is 1 ms, and 1 slot is composed of 7 OFDM symbols.
  • a resource block is a minimum allocation unit of data channel (PDSCH or PUSCH) resources defined in a two-dimensional plane in the time direction and the frequency direction, and is composed of 7 OFDM symbols in the time direction and 12 subcarriers in the frequency direction. ing.
  • control unit 11 when detecting the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 can be assigned within one subframe in the communication process performed by the BB card #C or the BB card #A.
  • the number of resource blocks may be limited to “100” to “50”.
  • the control unit 11 can be assigned within one subframe in the communication processing performed by the BB card #C or BB card #A.
  • the maximum throughput in units of users or cells may be limited.
  • the control unit 11 when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 performs the maximum throughput in units of users or cells in communication processing performed by the BB card #C or BB card #A. May be configured to be limited from “50 Mbps” to “25 Mbps”.
  • the second restriction is a restriction on the number of mobile stations UE that can be multiplexed in one subframe, that is, a restriction on the number of mobile stations UE that can allocate resources in one subframe.
  • the control unit 11 when detecting the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 can multiplex within one subframe in the communication process performed by the BB card #C or the BB card #A. It may be configured to limit the number of mobile stations UE from “4” to “2”.
  • the third restriction is a restriction on a subframe in which the mobile station UE can be multiplexed.
  • the control unit 11 when the controller 11 detects the occurrence of a failure in the BB card #A or BB card #C, the control unit 11 performs communication processing performed by the BB card #C or BB card #A in a specific subframe (for example, The mobile station UE may be configured not to be multiplexed in the (odd-numbered subframe).
  • the fourth restriction is a restriction on the number of PUCCH resources that can be allocated in one subframe or one resource block.
  • the PUCCH resource may be the number of PUCCH or the number of multiplexed PUCCH CS (Cyclic Sequence).
  • CS is a resource in the code direction, and is a plurality of sequences that have a “Cyclic Shift” relationship and are orthogonal to each other.
  • the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, in the communication process performed by the BB card #C or the BB card #A,
  • the number of PUCCHs that can be allocated in 1 is limited from “4” to “2”, or the number of multiplexed PUCCH CSs that can be allocated in one subframe or one resource block is limited from “6” to “3” Is configured to do.
  • the fifth restriction is a restriction on the number of PRACH subframes (number of PRACH slots) in one radio frame, that is, a restriction on the number of subframes to which a PRACH resource can be allocated in one radio frame.
  • the control unit 11 when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 performs the PRACH subframe in one radio frame in the communication processing performed by the BB card #C or the BB card #A.
  • the number may be limited from “2” to “1”.
  • the sixth restriction is a restriction on the number of RA route sequences to be used (RA root sequence).
  • the RA root sequence is a sequence that is the basis of the RA preamble used in the sector.
  • the mobile station UE generates 64 RA preambles from one or a plurality of RA route sequences notified from the radio base station eNB, and selects and transmits any one of the RA preambles. It is configured as follows.
  • the control unit 11 determines the number of RA route sequences to be used in the communication process performed by the BB card #C or the BB card #A. It is configured to limit from “2” to “1”.
  • the number of RA route sequences to be used may be the number of RA route sequences notified from the radio base station eNB to the mobile station UE, or an RA for generating an RA preamble to be detected by the radio base station eNB. It may be the number of root sequences.
  • the controller 11 when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, in the communication processing performed by the BB card #C or the BB card #A, It may be configured to limit the number.
  • the control unit 11 detects the occurrence of a failure in the BB card #A or the BB card #C, in the communication process performed by the BB card #C or the BB card #A,
  • the number may be limited to “400” to “200”.
  • the radio base station eNB detects occurrence of a failure in the BB card #A in step S101, the radio base station eNB is accommodated in the BB card #A in step S102, that is, by the BB card #A.
  • All sectors A0 to AB in which communication processing is performed belong to the sector group Agroup and are accommodated in the BB card #C, that is, all sectors C0 in which communication processing is performed by the BB card #C.
  • To CD belong to the sector group Cgroup.
  • step S103 the radio base station eNB starts changing from the BB card #A, which is the accommodation destination of the sector belonging to the sector group Agroup, to the BB card #C.
  • step S104 the radio base station eNB determines whether or not it is possible to accommodate sectors belonging to the sector group Agroup in the BB card #C in a restricted state with respect to the communication processing currently employed.
  • step S105 If it is determined that the sector belonging to the sector group Agroup in the BB card #C can be accommodated, the operation proceeds to step S105, and it is determined that the sector belonging to the sector group Agroup in the BB card #C cannot be accommodated. If so, the operation proceeds to step S106.
  • step S105 the radio base station eNB realizes the restriction state for the communication processing adopted at the present time, and then causes the BB card #C to accommodate sectors belonging to the sector group Agroup, that is, by the BB card #C. Then, the communication processing in the sector belonging to the sector group Agroup is performed.
  • the radio base station eNB can add a predetermined restriction to at least one communication process of the sector belonging to the sector group Agroup or the sector belonging to the sector group Cgroup performed in the BB card #C Judge about.
  • the radio base station eNB may be configured to add each of the first to sixth restrictions described above to the communication process in a predetermined order. .
  • step S107 If it is determined that the above limitation can be added, the operation proceeds to step S107. If it is determined that the limitation can be applied, the operation proceeds to step S108.
  • step S107 the radio base station eNB sets one or more restrictions selected from the first to sixth restrictions described above to sectors or sector groups belonging to the sector group Agroup that is performed in the BB card #C.
  • the restriction state for the communication processing currently employed is updated, and the operation returns to step S104.
  • step S108 the radio base station eNB excludes an arbitrary sector from the sectors belonging to the sector group Agroup, initializes the restriction state for the communication processing employed at the present time, and the operation proceeds to step S103. Return.
  • step S108 when there is no sector that can be excluded from the sectors belonging to the sector group Agroup, this operation ends.
  • the radio base station eNB has the same restriction applied to the communication process of the sector belonging to the sector group Agroup performed in the BB card #C and the restriction applied to the communication process of the sector belonging to the sector group Cgroup. Or may be different.
  • a mobile communication system that provides a mobile communication service using a shared channel, such as an LTE mobile communication system, can be connected simultaneously. Without limiting the number of stations UE, it is possible to avoid a situation in which a mobile communication service cannot be provided in a sector accommodated in a BB card where a failure has occurred.
  • a first feature of the present embodiment is that a radio base station eNB configured to perform communication with a plurality of mobile stations UE using a shared channel in one carrier of a 20 MHz band (predetermined frequency band).
  • BB card #A first communication card
  • BB card #C second communication card
  • control unit 11 configured to control BB card #A and BB card #C;
  • the controller 11 when the controller 11 detects the occurrence of a failure in the BB card #A, the BB card #C performs communication processing in the sectors A0 to AB and the sectors C0 to CD. Until it becomes possible, the limit added to the communication processing performed by the BB card #C may be increased.
  • the above-described limitation is a limitation on the number of resource blocks that can be allocated in one subframe, a limitation on the number of mobile stations that can be multiplexed in one subframe, and the multiplexing of mobile stations is possible.
  • the operations of the radio base station eNB and the mobile station UE1 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 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. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the radio base station eNB and the mobile station UE1. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB and the mobile station UE1.
  • a radio base station capable of continuing to provide a mobile communication service to a mobile station located in a sector where communication processing is performed by such a BB card.

Abstract

In an LTE type of mobile communication system, even if any trouble occurs in a BB card #A, the provision of a mobile communication service to a mobile station (UE) existing in a sector where the communication process is currently performed by the BB card #A can be continued. A control unit (11) of a radio base station (eNB) of this invention is configured to impose one or more limitations on a communication process performed by a BB card #C such that if the occurrence of any trouble in a BB card #A is detected, the BB card #C can perform communication processes in sectors A0 to AB and sectors C0 to CD.

Description

無線基地局Wireless base station
　本発明は、無線基地局に関する。 The present invention relates to a radio base station.
　Ｗ-ＣＤＭＡ（Ｗｉｄｅｂａｎｄ-ＣＤＭＡ）方式の移動通信システムでは、無線基地局ＮｏｄｅＢは、複数の移動局ＵＥとの間で、複数キャリア（例えば、５ＭＨｚ帯域の４キャリア）内の個別チャネルを用いて通信を行うように構成されている。 In a W-CDMA (Wideband-CDMA) mobile communication system, a radio base station NodeB communicates with a plurality of mobile stations UE using individual channels in a plurality of carriers (for example, 4 carriers in a 5 MHz band). Is configured to do.
　一方、ＬＴＥ（Ｌｏｎｇ　Ｔｅｒｍ　Ｅｖｏｌｕｔｉｏｎ）方式の移動通信システムでは、無線基地局ｅＮＢは、複数の移動局ＵＥとの間で、１キャリア（例えば、２０ＭＨｚ帯域の１キャリア）内の共有チャネルを用いて通信を行うように構成されていてもよい。 On the other hand, in an LTE (Long Term Evolution) mobile communication system, a radio base station eNB communicates with a plurality of mobile stations UE using a shared channel in one carrier (for example, one carrier in a 20 MHz band). It may be configured to perform.
　また、無線基地局ＮｏｄｅＢ及び無線基地局ｅＮＢは、複数のセクタ（或いは、セル）に対して、移動通信サービスを提供することができるように構成されている。 Moreover, the radio base station NodeB and the radio base station eNB are configured to be able to provide a mobile communication service to a plurality of sectors (or cells).
　ここで、無線基地局ＮｏｄｅＢ及び無線基地局ｅＮＢは、１つ又は複数のＢＢ（Ｂａｓｅｂａｎｄ）カードを具備しており、各ＢＢカードによって、１つ又は複数のセクタにおける通信処理を行うことができるように構成されている。 Here, the radio base station NodeB and the radio base station eNB include one or a plurality of BB (Baseband) cards, and each BB card can perform communication processing in one or a plurality of sectors. It is configured.
　しかしながら、ＢＢカード＃１において故障が発生した場合には、ＢＢカード＃１によって通信処理が行われていたセクタ＃１において移動通信サービスを提供することができなくなるといった問題が生じる。 However, when a failure occurs in the BB card # 1, there arises a problem that the mobile communication service cannot be provided in the sector # 1 where the communication processing is performed by the BB card # 1.
　ここで、Ｗ-ＣＤＭＡ方式の移動通信システムでは、複数キャリアによって移動通信サービスが提供されているため、セクタ＃１内に位置する移動局ＵＥを、ＢＢカード＃１以外のＢＢカードによって通信処理が行われている別のキャリアのセクタ＃２にハンドオーバさせることによって移動通信サービスの提供を継続することができるが、ＬＴＥ方式の移動通信システムでは、１キャリアによって移動通信サービスが提供されているため、Ｗ-ＣＤＭＡ方式の移動通信システムのように、セクタ＃１内に位置する移動局ＵＥに対して移動通信サービスの提供を継続することができないという問題点があった。 Here, in the mobile communication system of the W-CDMA system, mobile communication services are provided by a plurality of carriers. Therefore, the mobile station UE located in the sector # 1 is communicated by a BB card other than the BB card # 1. Although it is possible to continue providing mobile communication service by handing over to sector # 2 of another carrier being performed, in the LTE mobile communication system, mobile communication service is provided by one carrier, There is a problem that the mobile communication service cannot be continuously provided to the mobile station UE located in the sector # 1 as in the W-CDMA mobile communication system.
　そこで、本発明は、上述の課題に鑑みてなされたものであり、ＬＴＥ方式の移動通信システムのように１キャリアによって移動通信サービスが提供されている移動通信システムにおいて、ＢＢカードにおける故障が発生した場合であっても、かかるＢＢカードによって通信処理が行われているセクタ内に位置する移動局に対して移動通信サービスの提供を継続することができる無線基地局を提供することを目的とする。 Accordingly, the present invention has been made in view of the above-described problems, and a failure has occurred in a BB card in a mobile communication system in which a mobile communication service is provided by one carrier as in an LTE mobile communication system. Even if it is a case, it aims at providing the radio base station which can continue provision of a mobile communication service with respect to the mobile station located in the sector in which communication processing is performed by this BB card.
　本発明の第１の特徴は、複数の移動局との間で、所定周波数帯域の１キャリア内の共有チャネルを用いて通信を行うように構成されている無線基地局であって、第１エリアにおける通信処理を行うように構成されている第１通信カードと、第２エリアにおける通信処理を行うように構成されている第２通信カードと、前記第１通信カード及び前記第２通信カードを制御するように構成されている制御部とを具備しており、前記制御部は、前記第１通信カードにおける故障の発生を検出した場合に、前記第２通信カードが、前記第１エリア及び前記第２エリアにおける通信処理を行うことができるように、該第２通信カードによって行われる通信処理に対して１つ又は複数の制限を加えるように構成されていることを要旨とする。 A first feature of the present invention is a radio base station configured to perform communication with a plurality of mobile stations using a shared channel in one carrier of a predetermined frequency band, wherein the first area A first communication card configured to perform communication processing in the second area, a second communication card configured to perform communication processing in the second area, and the first communication card and the second communication card. And when the controller detects a failure in the first communication card, the second communication card is connected to the first area and the first area. The gist is that one or a plurality of restrictions are added to the communication processing performed by the second communication card so that the communication processing in two areas can be performed.
本発明の第１の実施形態に係る移動通信システムの全体構成図である。1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. 本発明の第１の実施形態に係る無線基地局の機能ブロック図である。FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. 本発明の第１の実施形態に係る無線基地局に含まれるＢＢカードの機能ブロック図である。It is a functional block diagram of a BB card included in the radio base station according to the first embodiment of the present invention. 本発明の第１の実施形態に係る無線基地局の動作を示すフローチャートである。5 is a flowchart showing an operation of the radio base station according to the first embodiment of the present invention.
（本発明の第１の実施形態に係る移動通信システムの構成）
　図１乃至図３を参照して、本発明の第１の実施形態に係る移動通信システムの構成について説明する。 (Configuration of mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIGS.
　本実施形態に係る移動通信システムは、ＬＴＥ方式の移動通信システムである。 The mobile communication system according to the present embodiment is an LTE mobile communication system.
　図１に示すように、本実施形態に係る移動通信システムでは、無線基地局ｅＮＢは、セクタ群Ａｇｒｏｕｐに属するセクタＡ０乃至ＡＢ（第１エリア）及びセクタ群Ｃｇｒｏｕｐに属するセクタＣ０乃至ＣＤ（第２エリア）内に位置する移動局ＵＥとの間で通信を行うように構成されている。 As illustrated in FIG. 1, in the mobile communication system according to the present embodiment, the radio base station eNB includes sectors A0 to AB (first area) belonging to the sector group Agroup and sectors C0 to CD (second area) belonging to the sector group Cgroup. It is configured to communicate with the mobile station UE located in the area.
　また、本実施形態に係る移動通信システムでは、無線基地局ｅＮＢは、複数の移動局ＵＥとの間で、所定システム周波数帯域の１キャリア内の共有チャネル、具体的には、ＰＵＳＣＨ（Ｐｈｙｓｉｃａｌ　Ｕｐｌｉｎｋ　Ｓｈａｒｅｄ　Ｃｈａｎｎｅｌ）やＰＤＳＣＨ（Ｐｈｙｓｉｃａｌ　Ｄｏｗｎｌｉｎｋ　Ｓｈａｒｅｄ　Ｃｈａｎｎｅｌ）やＰＵＣＣＨ（Ｐｈｙｓｉｃａｌ　Ｕｐｌｉｎｋ　Ｃｏｎｔｒｏｌ　Ｃｈａｎｎｅｌ）やＰＤＣＣＨ（Ｐｈｙｓｉｃａｌ　Ｄｏｗｎｌｉｎｋ　Ｃｏｎｔｒｏｌ　Ｃｈａｎｎｅｌ）やＰＲＡＣＨ（Ｐｈｙｓｉｃａｌ　Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｃｈａｎｎｅｌ）等を用いて通信を行うように構成されている。 Also, in the mobile communication system according to the present embodiment, the radio base station eNB communicates with a plurality of mobile stations UE in a shared channel within one carrier in a predetermined system frequency band, specifically, PUSCH (Physical Uplink Shared Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Channel, etc.) and PDCCH (Physical Downlink Control CHR), PDCCH (Physical Downlink Control CHR).
　図２に示すように、無線基地局ｅＮＢは、制御部１１と、上位ノードインターフェイス１２と、複数のＢＢカード＃Ａ、＃Ｃ…とを具備している。 As shown in FIG. 2, the radio base station eNB includes a control unit 11, an upper node interface 12, and a plurality of BB cards #A, #C,.
　制御部１１は、複数のＢＢカード＃Ａ、＃Ｃ…を制御するように構成されている。 The control unit 11 is configured to control a plurality of BB cards #A, #C.
　上位ノードインターフェイス１２は、交換局ＭＭＥやサービングゲートウェイ装置Ｓ-ＧＷ等の上位ノードとの間のインターフェイスとして機能するように構成されている。 The upper node interface 12 is configured to function as an interface with upper nodes such as the switching center MME and the serving gateway device S-GW.
　各ＢＢノードは、所定エリア（具体的には、１つ又は複数のセクタ又はセル）における通信処理を行うように構成されている。ここで、かかる通信処理には、符号化処理や、変調処理や、復調処理や、復号処理や、スケジューリング処理等が含まれる。 Each BB node is configured to perform communication processing in a predetermined area (specifically, one or a plurality of sectors or cells). Here, such communication processing includes encoding processing, modulation processing, demodulation processing, decoding processing, scheduling processing, and the like.
　なお、本実施形態では、ＢＢカード＃Ａ（第１通信カード）は、セクタ群Ａｇｒｏｕｐに属するセクタＡ０乃至ＡＢにおける通信処理を行うように構成されており、ＢＢカード＃Ｃ（第２通信カード）は、セクタ群Ｃｇｒｏｕｐに属するセクタＣ０乃至ＣＤにおける通信処理を行うように構成されている。 In the present embodiment, the BB card #A (first communication card) is configured to perform communication processing in the sectors A0 to AB belonging to the sector group Agroup, and the BB card #C (second communication card). Are configured to perform communication processing in sectors C0 to CD belonging to the sector group Cgroup.
　図３に示すように、ＢＢカード＃Ａ及びＢＢカード＃Ｃは、制御部インターフェイス２１と、符号化処理部２２と、変調処理部２３と、送信部２４と、受信部２５と、復調処理部２６と、復号処理部２７と、故障検出部２８と、スケジューリング部２９とを具備している。 As shown in FIG. 3, the BB card #A and the BB card #C include a control unit interface 21, an encoding processing unit 22, a modulation processing unit 23, a transmission unit 24, a reception unit 25, and a demodulation processing unit. 26, a decoding processing unit 27, a failure detection unit 28, and a scheduling unit 29.
　制御部インターフェイス２１は、制御部１１との間のインターフェイスとして機能するように構成されている。 The control unit interface 21 is configured to function as an interface with the control unit 11.
　符号化処理部２２は、制御部インターフェイス２１からの出力信号に対して符号化処理を行うように構成されている。 The encoding processing unit 22 is configured to perform an encoding process on the output signal from the control unit interface 21.
　変調処理部２３は、符号化処理部２２からの出力信号に対して変調処理を行うように構成されている。 The modulation processing unit 23 is configured to perform modulation processing on the output signal from the encoding processing unit 22.
　送信部２４は、変調処理部２３からの出力信号を、送信アンテナを介して、セクタ群Ａｇｒｏｕｐに属するセクタＡ０乃至ＡＢやセクタ群Ｃｇｒｏｕｐに属するセクタＣ０乃至ＣＤ等の所定エリアに対して送信するように構成されている。 The transmission unit 24 transmits the output signal from the modulation processing unit 23 to a predetermined area such as sectors A0 to AB belonging to the sector group Agroup and sectors C0 to CD belonging to the sector group Cgroup via the transmission antenna. It is configured.
　受信部２５は、受信アンテナを介して、セクタ群Ａｇｒｏｕｐに属するセクタＡ０乃至ＡＢやセクタ群Ｃｇｒｏｕｐに属するセクタＣ０乃至ＣＤ等の所定エリア内に位置する移動局ＵＥからの信号を受信するように構成されている。 The receiving unit 25 is configured to receive a signal from the mobile station UE located in a predetermined area such as the sectors A0 to AB belonging to the sector group Agroup and the sectors C0 to CD belonging to the sector group Cgroup via the receiving antenna. Has been.
　復調処理部２６は、受信部２５からの出力信号に対して復調処理を行うように構成されている。 The demodulation processing unit 26 is configured to perform demodulation processing on the output signal from the receiving unit 25.
　復号処理部２７は、復調処理部２６からの出力信号に対して復号処理を行うように構成されている。ここで、復号処理部２７からの出力信号は、制御部インターフェイス２１を介して制御部１１に送信されるように構成されている。 The decoding processing unit 27 is configured to perform decoding processing on the output signal from the demodulation processing unit 26. Here, the output signal from the decoding processing unit 27 is configured to be transmitted to the control unit 11 via the control unit interface 21.
　故障検出部２８は、ＢＢカード＃Ａ及びＢＢカード＃Ｃにおける故障の発生を検出するように構成されている。ここで、故障検出部２８は、ＢＢカード＃Ａ及びＢＢカード＃Ｃにおける故障の発生を検出した場合、その旨を、制御部インターフェイス２１を介して制御部１１に通知するように構成されている。 The failure detection unit 28 is configured to detect the occurrence of a failure in the BB card #A and the BB card #C. Here, when detecting the occurrence of a failure in the BB card #A and the BB card #C, the failure detection unit 28 is configured to notify the control unit 11 via the control unit interface 21. .
　スケジューリング部２９は、セクタ群Ａｇｒｏｕｐに属するセクタＡ０乃至ＡＢやセクタ群Ｃｇｒｏｕｐに属するセクタＣ０乃至ＣＤ等の所定エリア内に位置する移動局ＵＥに対するスケジューリング処理を行うように構成されている。 The scheduling unit 29 is configured to perform a scheduling process on the mobile station UE located in a predetermined area such as sectors A0 to AB belonging to the sector group Agroup and sectors C0 to CD belonging to the sector group Cgroup.
　ここで、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａが、セクタＡ０乃至ＡＢ及びセクタＣ０乃至ＣＤにおける通信処理を行うことができるように、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理に対して１つ又は複数の制限を加えるように構成されている。 Here, when the controller 11 detects the occurrence of a failure in the BB card #A or BB card #C, the BB card #C or BB card #A performs communication processing in the sectors A0 to AB and sectors C0 to CD. The communication processing performed by the BB card #C or the BB card #A is configured to add one or more restrictions.
　例えば、後述する図４に示すように、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａが、セクタＡ０乃至ＡＢ及びセクタＣ０乃至ＣＤにおける通信処理を行うことができるようになるまで、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理に対して加える制限を増やしていくように構成されていてもよい。 For example, as illustrated in FIG. 4 described later, when the control unit 11 detects the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 determines that the BB card #C or the BB card #A has the sectors A0 to AB. In addition, it may be configured to increase the limit added to the communication processing performed by the BB card #C or the BB card #A until the communication processing in the sectors C0 to CD can be performed.
　例えば、上述の制限としては、以下のものが想定される。 For example, the following are assumed as the above-mentioned restrictions.
　第１の制限は、１サブフレーム内で割り当て可能なリソースブロックの数に対する制限である。 The first limit is a limit on the number of resource blocks that can be allocated within one subframe.
　ＬＴＥ方式では、１無線フレーム（Ｒａｄｉｏ　Ｆｒａｍｅ）が、２０スロットによって構成されており、１無線フレームの時間長は、１０ｍｓであり（すなわち、１スロットの時間長は、０.５ｍｓであり）、１サブフレーム（Ｓｕｂｆｒａｍｅ）は、２スロットによって構成されており、１サブフレームの時間長は、１ｍｓであり、１スロットは、７ＯＦＤＭシンボルによって構成されている。 In the LTE scheme, one radio frame (Radio Frame) is composed of 20 slots, and the time length of one radio frame is 10 ms (that is, the time length of one slot is 0.5 ms), 1 A subframe is composed of 2 slots, the time length of 1 subframe is 1 ms, and 1 slot is composed of 7 OFDM symbols.
　また、リソースブロックは、時間方向及び周波数方向の二次元平面で定義されるデータチャネル（ＰＤＳＣＨやＰＵＳＣＨ）用リソースの最小割り当て単位であり、時間方向の７ＯＦＤＭシンボルと周波数方向の１２サブキャリアによって構成されている。 A resource block is a minimum allocation unit of data channel (PDSCH or PUSCH) resources defined in a two-dimensional plane in the time direction and the frequency direction, and is composed of 7 OFDM symbols in the time direction and 12 subcarriers in the frequency direction. ing.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、１サブフレーム内で割り当て可能なリソースブロックの数を「１００」から「５０」に制限するように構成されていてもよい。 For example, when detecting the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 can be assigned within one subframe in the communication process performed by the BB card #C or the BB card #A. The number of resource blocks may be limited to “100” to “50”.
　ここで、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、１サブフレーム内で割り当て可能なリソースブロックの数を制限することによって、ユーザ単位或いはセル単位の最大スループットを制限するように構成されていてもよい。 Here, when the occurrence of a failure in the BB card #A or BB card #C is detected, the control unit 11 can be assigned within one subframe in the communication processing performed by the BB card #C or BB card #A. By limiting the number of resource blocks, the maximum throughput in units of users or cells may be limited.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、ユーザ単位或いはセル単位の最大スループットを「５０Ｍｂｐｓ」から「２５Ｍｂｐｓ」に制限するように構成されていてもよい。 For example, when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 performs the maximum throughput in units of users or cells in communication processing performed by the BB card #C or BB card #A. May be configured to be limited from “50 Mbps” to “25 Mbps”.
　第２の制限は、１サブフレーム内で多重可能な移動局ＵＥの数に対する制限、すなわち、１サブフレーム内でリソースを割り当て可能な移動局ＵＥの数に対する制限である。 The second restriction is a restriction on the number of mobile stations UE that can be multiplexed in one subframe, that is, a restriction on the number of mobile stations UE that can allocate resources in one subframe.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、１サブフレーム内で多重可能な移動局ＵＥの数を「４」から「２」に制限するように構成されていてもよい。 For example, when detecting the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 can multiplex within one subframe in the communication process performed by the BB card #C or the BB card #A. It may be configured to limit the number of mobile stations UE from “4” to “2”.
　第３の制限は、移動局ＵＥを多重可能なサブフレームに対する制限である。 The third restriction is a restriction on a subframe in which the mobile station UE can be multiplexed.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、ある特定のサブフレーム（例えば、奇数番目のサブフレーム）には移動局ＵＥを多重しないように制限するように構成されていてもよい。 For example, when the controller 11 detects the occurrence of a failure in the BB card #A or BB card #C, the control unit 11 performs communication processing performed by the BB card #C or BB card #A in a specific subframe (for example, The mobile station UE may be configured not to be multiplexed in the (odd-numbered subframe).
　第４の制限は、１サブフレーム又は１リソースブロック内で割り当て可能なＰＵＣＣＨ用リソースの数に対する制限である。 The fourth restriction is a restriction on the number of PUCCH resources that can be allocated in one subframe or one resource block.
　ここで、ＰＵＣＣＨ用リソースとしては、ＰＵＣＣＨの本数や、ＰＵＣＣＨのＣＳ（Ｃｙｃｌｉｃ　Ｓｅｑｕｅｎｃｅ）の多重数であってもよい。ＣＳは、コード方向のリソースであり、「Ｃｙｃｌｉｃ　Ｓｈｉｆｔ」の関係にあり互いに直交する複数の系列である。 Here, the PUCCH resource may be the number of PUCCH or the number of multiplexed PUCCH CS (Cyclic Sequence). CS is a resource in the code direction, and is a plurality of sequences that have a “Cyclic Shift” relationship and are orthogonal to each other.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、１サブフレーム又は１リソースブロック内で割り当て可能なＰＵＣＣＨの本数を「４」から「２」に制限したり、１サブフレーム又は１リソースブロック内で割り当て可能なＰＵＣＣＨのＣＳの多重数を「６」から「３」に制限したりするように構成されている。 For example, when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, in the communication process performed by the BB card #C or the BB card #A, The number of PUCCHs that can be allocated in 1 is limited from “4” to “2”, or the number of multiplexed PUCCH CSs that can be allocated in one subframe or one resource block is limited from “6” to “3” Is configured to do.
　第５の制限は、１無線フレーム内のＰＲＡＣＨサブフレーム数（ＰＲＡＣＨスロット数）に対する制限、すなわち、１無線フレーム内でＰＲＡＣＨ用リソースを割り当て可能なサブフレーム数に対する制限である。 The fifth restriction is a restriction on the number of PRACH subframes (number of PRACH slots) in one radio frame, that is, a restriction on the number of subframes to which a PRACH resource can be allocated in one radio frame.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、１無線フレーム内のＰＲＡＣＨサブフレーム数を「２」から「１」に制限するように構成されていてもよい。 For example, when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 performs the PRACH subframe in one radio frame in the communication processing performed by the BB card #C or the BB card #A. The number may be limited from “2” to “1”.
　第６の制限は、使用するＲＡルートシーケンス（ＲＡ　ｒｏｏｔ　ｓｅｑｕｅｎｃｅ）の数に対する制限である。 The sixth restriction is a restriction on the number of RA route sequences to be used (RA root sequence).
　ここで、ＲＡルートシーケンスは、当該セクタで用いられるＲＡプリアンブルの元になる系列である。 Here, the RA root sequence is a sequence that is the basis of the RA preamble used in the sector.
　具体的には、移動局ＵＥは、無線基地局ｅＮＢから通知された１つ又は複数のＲＡルートシーケンスから６４個のＲＡプリアンブルを生成し、そのいずれか１個のＲＡプリアンブルを選択して送信するように構成されている。 Specifically, the mobile station UE generates 64 RA preambles from one or a plurality of RA route sequences notified from the radio base station eNB, and selects and transmits any one of the RA preambles. It is configured as follows.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、使用するＲＡルートシーケンスの数を「２」から「１」に制限するように構成されている。 For example, when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, the control unit 11 determines the number of RA route sequences to be used in the communication process performed by the BB card #C or the BB card #A. It is configured to limit from “2” to “1”.
　ここで、使用するＲＡルートシーケンス数は、無線基地局ｅＮＢから移動局ＵＥに通知するＲＡルートシーケンスの数であってもよいし、無線基地局ｅＮＢが検出を試みるＲＡプリアンブルを生成するためのＲＡルートシーケンスの数であってもよい。 Here, the number of RA route sequences to be used may be the number of RA route sequences notified from the radio base station eNB to the mobile station UE, or an RA for generating an RA preamble to be detected by the radio base station eNB. It may be the number of root sequences.
　また、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、同時に接続可能な移動局ＵＥの数を制限するように構成されていてもよい。 In addition, when the controller 11 detects the occurrence of a failure in the BB card #A or the BB card #C, in the communication processing performed by the BB card #C or the BB card #A, It may be configured to limit the number.
　例えば、制御部１１は、ＢＢカード＃Ａ又はＢＢカード＃Ｃにおける故障の発生を検出した場合に、ＢＢカード＃Ｃ又はＢＢカード＃Ａによって行われる通信処理において、同時に接続可能な移動局ＵＥの数を「４００」から「２００」制限するように構成されていてもよい。 For example, when the control unit 11 detects the occurrence of a failure in the BB card #A or the BB card #C, in the communication process performed by the BB card #C or the BB card #A, The number may be limited to “400” to “200”.
（本発明の第１の実施形態に係る移動通信システムの動作）
　図４を参照して、本発明の第１の実施形態に係る移動通信システムの動作について、具体的には、本発明の第１の実施形態に係る無線基地局ｅＮＢの動作について説明する。 (Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 4, the operation of the mobile communication system according to the first embodiment of the present invention, specifically, the operation of the radio base station eNB according to the first embodiment of the present invention will be described.
　図４に示すように、無線基地局ｅＮＢは、ステップＳ１０１において、ＢＢカード＃Ａにおける故障の発生を検出すると、ステップＳ１０２において、ＢＢカード＃Ａに収容されている、すなわち、ＢＢカード＃Ａによって通信処理が行われている全てのセクタＡ０乃至ＡＢをセクタ群Ａｇｒｏｕｐに属するものとし、ＢＢカード＃Ｃに収容されている、すなわち、ＢＢカード＃Ｃによって通信処理が行われている全てのセクタＣ０乃至ＣＤをセクタ群Ｃｇｒｏｕｐに属するものとする。 As illustrated in FIG. 4, when the radio base station eNB detects occurrence of a failure in the BB card #A in step S101, the radio base station eNB is accommodated in the BB card #A in step S102, that is, by the BB card #A. All sectors A0 to AB in which communication processing is performed belong to the sector group Agroup and are accommodated in the BB card #C, that is, all sectors C0 in which communication processing is performed by the BB card #C. To CD belong to the sector group Cgroup.
　ステップＳ１０３において、無線基地局ｅＮＢは、セクタ群Ａｇｒｏｕｐに属するセクタの収容先のＢＢカード＃ＡからＢＢカード＃Ｃへの変更を開始する。 In step S103, the radio base station eNB starts changing from the BB card #A, which is the accommodation destination of the sector belonging to the sector group Agroup, to the BB card #C.
　ステップＳ１０４において、無線基地局ｅＮＢは、現時点で採用されている通信処理に対する制限状態で、ＢＢカード＃Ｃにおけるセクタ群Ａｇｒｏｕｐに属するセクタの収容が可能であるか否かについて判定する。 In step S104, the radio base station eNB determines whether or not it is possible to accommodate sectors belonging to the sector group Agroup in the BB card #C in a restricted state with respect to the communication processing currently employed.
　ＢＢカード＃Ｃにおけるセクタ群Ａｇｒｏｕｐに属するセクタの収容が可能であると判定された場合、本動作は、ステップＳ１０５に進み、ＢＢカード＃Ｃにおけるセクタ群Ａｇｒｏｕｐに属するセクタの収容が可能でないと判定された場合、本動作は、ステップＳ１０６に進む。 If it is determined that the sector belonging to the sector group Agroup in the BB card #C can be accommodated, the operation proceeds to step S105, and it is determined that the sector belonging to the sector group Agroup in the BB card #C cannot be accommodated. If so, the operation proceeds to step S106.
　ステップＳ１０５において、無線基地局ｅＮＢは、現時点で採用されている通信処理に対する制限状態を実現した上で、ＢＢカード＃Ｃに、セクタ群Ａｇｒｏｕｐに属するセクタを収容させる、すなわち、ＢＢカード＃Ｃによって、セクタ群Ａｇｒｏｕｐに属するセクタにおける通信処理を行わせる。 In step S105, the radio base station eNB realizes the restriction state for the communication processing adopted at the present time, and then causes the BB card #C to accommodate sectors belonging to the sector group Agroup, that is, by the BB card #C. Then, the communication processing in the sector belonging to the sector group Agroup is performed.
　ステップＳ１０６において、無線基地局ｅＮＢは、ＢＢカード＃Ｃにおいて行われるセクタ群Ａｇｒｏｕｐに属するセクタ又はセクタ群Ｃｇｒｏｕｐに属するセクタの少なくとも一方の通信処理に対して所定の制限を加えることができるか否かについて判定する。 In step S106, the radio base station eNB can add a predetermined restriction to at least one communication process of the sector belonging to the sector group Agroup or the sector belonging to the sector group Cgroup performed in the BB card #C Judge about.
　ここで、無線基地局ｅＮＢは、予め決められている順序で、上述の第１の制限乃至第６の制限の各々を、上述の通信処理に対して加えていくように構成されていてもよい。 Here, the radio base station eNB may be configured to add each of the first to sixth restrictions described above to the communication process in a predetermined order. .
　上述の制限を加えることができると判定された場合、本動作は、ステップＳ１０７に進み、上述の制限を加えることができると判定された場合、本動作は、ステップＳ１０８に進む。 If it is determined that the above limitation can be added, the operation proceeds to step S107. If it is determined that the limitation can be applied, the operation proceeds to step S108.
　ステップＳ１０７において、無線基地局ｅＮＢは、上述の第１の制限乃至第６の制限の中から選択した１つ又は複数の制限を、ＢＢカード＃Ｃにおいて行われるセクタ群Ａｇｒｏｕｐに属するセクタ又はセクタ群Ｃｇｒｏｕｐに属するセクタの少なくとも一方の通信処理に対して加えることによって、現時点で採用されている通信処理に対する制限状態を更新し、本動作は、ステップＳ１０４に戻る。 In step S107, the radio base station eNB sets one or more restrictions selected from the first to sixth restrictions described above to sectors or sector groups belonging to the sector group Agroup that is performed in the BB card #C. By adding to the communication processing of at least one of the sectors belonging to Cgroup, the restriction state for the communication processing currently employed is updated, and the operation returns to step S104.
　一方、ステップＳ１０８において、無線基地局ｅＮＢは、セクタ群Ａｇｒｏｕｐに属するセクタの中から任意のセクタを除外し、現時点で採用されている通信処理に対する制限状態を初期化し、本動作は、ステップＳ１０３に戻る。 On the other hand, in step S108, the radio base station eNB excludes an arbitrary sector from the sectors belonging to the sector group Agroup, initializes the restriction state for the communication processing employed at the present time, and the operation proceeds to step S103. Return.
　なお、ステップＳ１０８において、セクタ群Ａｇｒｏｕｐに属するセクタの中から除外することができるセクタが存在しなくなった場合、本動作は、終了する。 In step S108, when there is no sector that can be excluded from the sectors belonging to the sector group Agroup, this operation ends.
　ここで、無線基地局ｅＮＢは、ＢＢカード＃Ｃにおいて行われるセクタ群Ａｇｒｏｕｐに属するセクタの通信処理に対して加える制限と、セクタ群Ｃｇｒｏｕｐに属するセクタの通信処理に対して加える制限を、同じものとしてもよいし、異なるものとしてもよい。 Here, the radio base station eNB has the same restriction applied to the communication process of the sector belonging to the sector group Agroup performed in the BB card #C and the restriction applied to the communication process of the sector belonging to the sector group Cgroup. Or may be different.
（本発明の第１の実施形態に係る移動通信システムの作用・効果）
　本発明の第１の実施形態に係る移動通信システムによれば、ＬＴＥ方式の移動通信システムのように、１キャリアによって移動通信サービスを提供する移動通信システムであっても、故障が発生したＢＢカードに収容されていたセクタにおいて移動通信サービスを提供することができないという事態を回避することができる。 (Operations and effects of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the first embodiment of the present invention, even in a mobile communication system that provides a mobile communication service with one carrier, such as an LTE mobile communication system, a BB card in which a failure has occurred. It is possible to avoid a situation in which the mobile communication service cannot be provided in the sector accommodated in the mobile phone.
　また、本発明の第１の実施形態に係る移動通信システムによれば、ＬＴＥ方式の移動通信システムのように、共有チャネルを用いて移動通信サービスを提供する移動通信システムにおいて、同時に接続可能な移動局ＵＥの数を制限することなく、故障が発生したＢＢカードに収容されていたセクタにおいて移動通信サービスを提供することができないという事態を回避することができる。 Further, according to the mobile communication system according to the first embodiment of the present invention, a mobile communication system that provides a mobile communication service using a shared channel, such as an LTE mobile communication system, can be connected simultaneously. Without limiting the number of stations UE, it is possible to avoid a situation in which a mobile communication service cannot be provided in a sector accommodated in a BB card where a failure has occurred.
　以上に述べた本実施形態の特徴は、以下のように表現されていてもよい。 The features of the present embodiment described above may be expressed as follows.
　本実施形態の第１の特徴は、複数の移動局ＵＥとの間で、２０ＭＨｚ帯域（所定周波数帯域）の１キャリア内の共有チャネルを用いて通信を行うように構成されている無線基地局ｅＮＢであって、セクタ群Ａｇｒｏｕｐに属するセクタＡ０乃至ＡＢ（第１エリア）における通信処理を行うように構成されているＢＢカード＃Ａ（第１通信カード）と、セクタ群Ｃｇｒｏｕｐに属するセクタＣ０乃至ＣＤ（第２エリア）における通信処理を行うように構成されているＢＢカード＃Ｃ（第２通信カード）と、ＢＢカード＃Ａ及びＢＢカード＃Ｃを制御するように構成されている制御部１１とを具備しており、制御部１１は、ＢＢカード＃Ａにおける故障の発生を検出した場合に、ＢＢカード＃Ｃが、セクタＡ０乃至ＡＢ及びセクタＣ０乃至ＣＤにおける通信処理を行うことができるように、ＢＢカード＃Ｃによって行われる通信処理に対して１つ又は複数の制限を加えるように構成されていることを要旨とする。 A first feature of the present embodiment is that a radio base station eNB configured to perform communication with a plurality of mobile stations UE using a shared channel in one carrier of a 20 MHz band (predetermined frequency band). BB card #A (first communication card) configured to perform communication processing in sectors A0 to AB (first area) belonging to sector group Agroup, and sectors C0 to CD belonging to sector group Cgroup. BB card #C (second communication card) configured to perform communication processing in (second area), and control unit 11 configured to control BB card #A and BB card #C; When the controller 11 detects the occurrence of a failure in the BB card #A, the control unit 11 determines that the BB card #C includes the sectors A0 to AB and the sectors C0 to CD. As can be performed definitive communication process, and summarized in that it is configured to apply one or more restriction to the communication processing performed by the BB card #C.
　本実施形態の第１の特徴において、制御部１１は、ＢＢカード＃Ａにおける故障の発生を検出した場合に、ＢＢカード＃Ｃが、セクタＡ０乃至ＡＢ及びセクタＣ０乃至ＣＤにおける通信処理を行うことができるようになるまで、ＢＢカード＃Ｃによって行われる通信処理に対して加える制限を増やしていくように構成されていてもよい。 In the first feature of the present embodiment, when the controller 11 detects the occurrence of a failure in the BB card #A, the BB card #C performs communication processing in the sectors A0 to AB and the sectors C0 to CD. Until it becomes possible, the limit added to the communication processing performed by the BB card #C may be increased.
　本実施形態の第１の特徴において、上述の制限は、１サブフレーム内で割り当て可能なリソースブロックの数に対する制限、１サブフレーム内で多重可能な移動局の数に対する制限、移動局を多重可能なサブフレームに対する制限、１サブフレーム又は１リソースブロック内で割り当て可能なＰＵＣＣＨ用リソースの数に対する制限、１無線フレーム内のＰＲＡＣＨサブフレーム数（ＰＲＡＣＨスロット数）に対する制限、又は、使用するＲＡルートシーケンスの数に対する制限のいずれかであってもよい。 In the first feature of the present embodiment, the above-described limitation is a limitation on the number of resource blocks that can be allocated in one subframe, a limitation on the number of mobile stations that can be multiplexed in one subframe, and the multiplexing of mobile stations is possible. Limit on the number of PUCCH resources that can be allocated in one subframe or one resource block, limit on the number of PRACH subframes (number of PRACH slots) in a radio frame, or RA route sequence to be used Any of the restrictions on the number of
　なお、上述の無線基地局ｅＮＢ及び移動局ＵＥ１の動作は、ハードウェアによって実施されてもよいし、プロセッサによって実行されるソフトウェアモジュールによって実施されてもよいし、両者の組み合わせによって実施されてもよい。 The operations of the radio base station eNB and the mobile station UE1 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. .
　ソフトウェアモジュールは、ＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）や、フラッシュメモリや、ＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）や、ＥＰＲＯＭ（Ｅｒａｓａｂｌｅ　Ｐｒｏｇｒａｍｍａｂｌｅ　ＲＯＭ）や、ＥＥＰＲＯＭ（Ｅｌｅｃｔｒｏｎｉｃａｌｌｙ　Ｅｒａｓａｂｌｅ　ａｎｄ　Ｐｒｏｇｒａｍｍａｂｌｅ　ＲＯＭ）や、レジスタや、ハードディスクや、リムーバブルディスクや、ＣＤ-ＲＯＭといった任意形式の記憶媒体内に設けられていてもよい。 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 a storage medium of an arbitrary format such as a CD-ROM.
　かかる記憶媒体は、プロセッサが当該記憶媒体に情報を読み書きできるように、当該プロセッサに接続されている。また、かかる記憶媒体は、プロセッサに集積されていてもよい。また、かかる記憶媒体及びプロセッサは、ＡＳＩＣ内に設けられていてもよい。かかるＡＳＩＣは、無線基地局ｅＮＢ及び移動局ＵＥ１内に設けられていてもよい。また、かかる記憶媒体及びプロセッサは、ディスクリートコンポーネントとして無線基地局ｅＮＢ及び移動局ＵＥ１内に設けられていてもよい。 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. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the radio base station eNB and the mobile station UE1. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB and the mobile station UE1.
　以上、上述の実施形態を用いて本発明について詳細に説明したが、当業者にとっては、本発明が本明細書中に説明した実施形態に限定されるものではないということは明らかである。本発明は、特許請求の範囲の記載により定まる本発明の趣旨及び範囲を逸脱することなく修正及び変更態様として実施することができる。従って、本明細書の記載は、例示説明を目的とするものであり、本発明に対して何ら制限的な意味を有するものではない。従って、本明細書の記載は、例示説明を目的とするものであり、本発明に対して何ら制限的な意味を有するものではない。 As described above, the present invention has been described in detail using the above-described embodiments. However, it is obvious for those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Accordingly, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention. Accordingly, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.
産業上の利用の可能性Industrial applicability
　以上説明したように、本発明によれば、ＬＴＥ方式の移動通信システムのように１キャリアによって移動通信サービスが提供されている移動通信システムにおいて、ＢＢカードにおける故障が発生した場合であっても、かかるＢＢカードによって通信処理が行われているセクタ内に位置する移動局に対して移動通信サービスの提供を継続することができる無線基地局を提供することができる。 As described above, according to the present invention, even if a failure occurs in the BB card in a mobile communication system in which a mobile communication service is provided by one carrier as in an LTE mobile communication system, It is possible to provide a radio base station capable of continuing to provide a mobile communication service to a mobile station located in a sector where communication processing is performed by such a BB card.

Claims (3)

  1. 　複数の移動局との間で、所定周波数帯域の１キャリア内の共有チャネルを用いて通信を行うように構成されている無線基地局であって、
    　第１エリアにおける通信処理を行うように構成されている第１通信カードと、
    　第２エリアにおける通信処理を行うように構成されている第２通信カードと、
    　前記第１通信カード及び前記第２通信カードを制御するように構成されている制御部とを具備しており、
    　前記制御部は、前記第１通信カードにおける故障の発生を検出した場合に、前記第２通信カードが、前記第１エリア及び前記第２エリアにおける通信処理を行うことができるように、該第２通信カードによって行われる通信処理に対して１つ又は複数の制限を加えるように構成されていることを特徴とする無線基地局。     A radio base station configured to communicate with a plurality of mobile stations using a shared channel in one carrier of a predetermined frequency band,
    A first communication card configured to perform communication processing in the first area;
    A second communication card configured to perform communication processing in the second area;
    A control unit configured to control the first communication card and the second communication card,
    When the controller detects the occurrence of a failure in the first communication card, the second communication card can perform the communication process in the first area and the second area. A radio base station configured to add one or more restrictions to communication processing performed by a communication card.
  2. 　前記制御部は、前記第１通信カードにおける故障の発生を検出した場合に、前記第２通信カードが、前記第１エリア及び前記第２エリアにおける通信処理を行うことができるようになるまで、該第２通信カードによって行われる通信処理に対して加える前記制限を増やしていくように構成されていることを特徴とする請求項１に記載の無線基地局。 When the controller detects occurrence of a failure in the first communication card, the second communication card can perform communication processing in the first area and the second area until the second communication card can perform communication processing in the first area and the second area. The radio base station according to claim 1, wherein the radio base station is configured to increase the restriction applied to communication processing performed by the second communication card.
  3. 　前記制限は、１サブフレーム内で割り当て可能なリソースブロックの数に対する制限、１サブフレーム内で多重可能な移動局の数に対する制限、移動局を多重可能なサブフレームに対する制限、１サブフレーム又は１リソースブロック内で割り当て可能なＰＵＣＣＨ用リソースの数に対する制限、１無線フレーム内のＰＲＡＣＨスロット数に対する制限、又は、使用するＲＡルートシーケンスの数に対する制限のいずれかであることを特徴とする請求項１又は２に記載の無線基地局。 The limitation is a limitation on the number of resource blocks that can be allocated in one subframe, a limitation on the number of mobile stations that can be multiplexed in one subframe, a limitation on subframes in which a mobile station can be multiplexed, 1 subframe, or 1 2. The limitation on the number of PUCCH resources that can be allocated in a resource block, one of the limitation on the number of PRACH slots in a radio frame, or the limitation on the number of RA route sequences to be used. Or the radio base station of 2.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004088206A (en) * 2002-08-23 2004-03-18 Hitachi Kokusai Electric Inc Radio base station apparatus
JP2009038692A (en) * 2007-08-03 2009-02-19 Fujitsu Ltd Base station apparatus and area relief method in case of fault in base station apparatus
JP2009170955A (en) * 2008-01-10 2009-07-30 Ntt Docomo Inc Radio base station, radio communication control system, and radio communication control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004088206A (en) * 2002-08-23 2004-03-18 Hitachi Kokusai Electric Inc Radio base station apparatus
JP2009038692A (en) * 2007-08-03 2009-02-19 Fujitsu Ltd Base station apparatus and area relief method in case of fault in base station apparatus
JP2009170955A (en) * 2008-01-10 2009-07-30 Ntt Docomo Inc Radio base station, radio communication control system, and radio communication control method

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