WO2011034022A1 - Station radio de base - Google Patents

Station radio de base 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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WO
WIPO (PCT)
Prior art keywords
card
base station
radio base
communication
area
Prior art date
Application number
PCT/JP2010/065727
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English (en)
Japanese (ja)
Inventor
耕平 清嶋
啓之 石井
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
Publication date
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 WO2011034022A1 publication Critical patent/WO2011034022A1/fr

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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.

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

Abstract

Dans un système de communication mobile de type LTE (à évolution à long terme), même si un dysfonctionnement se produit dans une carte BB #A, la fourniture du service de communication mobile auprès d'un poste mobile (UE) existant dans un secteur de mise en œuvre actuelle du processus de communication se au moyen de la carte BB #A continuera d'être assurée. Dans le cadre ce cette invention, une unité de commande (11) d'une station radio de base (eNB) est conçue pour imposer une ou plusieurs limitations à un processus de communication via une carte BB #C de sorte que la carte BB #C peut assurer les processus de communication dans les secteurs A0 à AB et dans les secteurs C0 à CD en cas d'un quelconque dysfonctionnement d'une carte BB #A.
PCT/JP2010/065727 2009-09-15 2010-09-13 Station radio de base WO2011034022A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-213490 2009-09-15
JP2009213490A JP2011066528A (ja) 2009-09-15 2009-09-15 無線基地局

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WO2011034022A1 true WO2011034022A1 (fr) 2011-03-24

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PCT/JP2010/065727 WO2011034022A1 (fr) 2009-09-15 2010-09-13 Station radio de base

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004088206A (ja) * 2002-08-23 2004-03-18 Hitachi Kokusai Electric Inc 無線基地局装置
JP2009038692A (ja) * 2007-08-03 2009-02-19 Fujitsu Ltd 基地局装置及び基地局装置障害時のエリア救済方法
JP2009170955A (ja) * 2008-01-10 2009-07-30 Ntt Docomo Inc 無線基地局、無線通信制御システム及び無線通信制御方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004088206A (ja) * 2002-08-23 2004-03-18 Hitachi Kokusai Electric Inc 無線基地局装置
JP2009038692A (ja) * 2007-08-03 2009-02-19 Fujitsu Ltd 基地局装置及び基地局装置障害時のエリア救済方法
JP2009170955A (ja) * 2008-01-10 2009-07-30 Ntt Docomo Inc 無線基地局、無線通信制御システム及び無線通信制御方法

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