WO2014050355A1 - Mobile communication system and radio base station - Google Patents

Mobile communication system and radio base station Download PDF

Info

Publication number
WO2014050355A1
WO2014050355A1 PCT/JP2013/072053 JP2013072053W WO2014050355A1 WO 2014050355 A1 WO2014050355 A1 WO 2014050355A1 JP 2013072053 W JP2013072053 W JP 2013072053W WO 2014050355 A1 WO2014050355 A1 WO 2014050355A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
radio base
communication system
cell
mobile communication
Prior art date
Application number
PCT/JP2013/072053
Other languages
French (fr)
Japanese (ja)
Inventor
徹 内野
高橋　秀明
ウリ アンダルマワンティ ハプサリ
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 WO2014050355A1 publication Critical patent/WO2014050355A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00698—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using different RATs

Definitions

  • the present invention relates to a mobile communication system and a radio base station.
  • a C-plane signal that requires reliability is transmitted via the radio base station eNB # 1 (e.g., via SRB (Signaling Radio Bearer)).
  • the cell # 1 (macro cell) under the control of the macro eNB) communicates with a cell under the radio base station eNB # 10 (small eNB) via DRB (Data Radio Bearer) for U-plane signals that require broadband communication.
  • DRB Data Radio Bearer
  • the C-plane signal is communicated with the cell # 1 under the radio base station eNB # 1 via the SRB, and the U-plane signal is communicated with the radio base station eNB # 10 via the DRB.
  • the radio base station eNB # 1 is between the mobile station UE and the radio base station eNB # 1 / radio base station eNB # 10. It is assumed that connectivity and setting handling will be performed.
  • cell # 1 macro cell
  • Pcell Primary Cell
  • Scell Secondary Cell
  • the radio base station eNB is configured to detect quality degradation (uplink synchronization loss, etc.) in the uplink with the mobile station UE.
  • the radio base station eNB should stop scheduling for a cell with deteriorated quality from the viewpoint of interference with other mobile stations UE and resource utilization efficiency.
  • the radio base station eNB If quality degradation in the uplink with the mobile station UE is detected, and the cell in which such quality degradation is detected is “Pcell (Primary cell)”, the radio base station eNB , RA (Random Access) procedure is started, and if the mobile station UE does not return, the mobile station UE is moved to the “RRC_IDLE state” by transmitting “RRC connection release”. Can be considered.
  • Cell Primary cell
  • RA Random Access
  • the radio base station eNB may be operated to delete the Scell or deactivate the Scell by transmitting “RRC connection reconfiguration”.
  • the radio base station eNB handles a cell in which such quality degradation is detected using the C-plane signal. Is done.
  • the C-plane signal is communicated in the cell # 1 under the radio base station eNB # 1 via the SRB.
  • the radio base station eNB # 10 is in the uplink in the cell # 10.
  • Cell # 10 cannot be deleted because the C-plane signal cannot be transmitted / received to / from the mobile station UE, and as a result, the mobile station UE The U-plane signal cannot be transmitted / received between the two.
  • the present invention has been made in view of the above-described problems.
  • the C-plane signal is communicated in the cell # 1 under the radio base station eNB # 1 via the SRB.
  • the uplink quality degradation in the cell # 10 may occur.
  • An object of the present invention is to provide a mobile communication system and a radio base station that can take appropriate measures when detected.
  • the first feature of the present invention is that the mobile station is configured to perform carrier aggregation via the first cell under the first radio base station and the second cell under the second radio base station.
  • the first radio base station is configured to transmit and receive control signals and data signals to and from the mobile station
  • the second radio base station is configured to be capable of transmitting / receiving a data signal to / from a station and not to transmit / receive a control signal, and the second radio base station performs quality degradation in an uplink with the mobile station.
  • the gist of the present invention is that a predetermined notification is sent to the first radio base station when the first radio base station is detected.
  • the second feature of the present invention is configured such that the mobile station can perform carrier aggregation via the first cell under the first radio base station and the second cell under the second radio base station,
  • the first radio base station is configured to be able to transmit and receive control signals and data signals to and from the mobile station, and the second radio base station can communicate with the mobile station,
  • the present invention is summarized in that a predetermined notification is made to the first radio base station when quality degradation in the uplink during is detected.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the radio base station eNB # 10 according to the first embodiment of the present invention.
  • FIG. 3 is a functional block diagram of the radio base station eNB # 1 according to the first embodiment of the present invention.
  • FIG. 4 is a flowchart showing an operation of the radio base station eNB # 10 according to the first modification of the present invention.
  • FIG. 5 is a diagram for explaining the prior art.
  • FIG. 6 is a diagram for explaining the prior art.
  • FIG. 7 is a diagram for explaining the prior art.
  • Mobile communication system according to the first embodiment of the present invention A mobile communication system according to a first embodiment of the present invention will be described with reference to FIGS.
  • the mobile communication system is an LTE mobile communication system, and is configured to be able to apply “Inter-site CA”.
  • the mobile station UE performs “Inter-site CA” via the cell # 1 under the radio base station eNB # 1 and the cell # 10 under the radio base station eNB # 10. It is configured to be able to do.
  • the mobile communication system includes a radio base station eNB # 10 (small eNB) that manages the cell # 10 and a radio base station eNB # 1 (macro eNB) that manages the cell # 1. ing.
  • eNB # 10 small eNB
  • eNB # 1 macro eNB
  • cell # 10 is a small cell (phantom cell), and cell # 1 is a macro cell. Note that the coverage area of the cell # 10 and the coverage area of the cell # 1 are arranged so as to overlap at least partially.
  • a C-plane signal can be transmitted / received via the C-plane bearer # 1
  • a U-plane signal can be transmitted / received via the U-plane bearer # 1. It is configured to be able to.
  • a U-plane signal can be transmitted / received via the U-plane bearer # 10, and a C-plane signal cannot be transmitted / received. Yes.
  • the mobile station UE communicates with the radio base station eNB # 10 based on the C-plane signal received from the radio base station eNB # 1 via the C-plane bearer # 1. Is configured to set.
  • the radio base station eNB # 10 includes a detection unit 11 and a notification unit 12.
  • the detection unit 11 is configured to detect quality degradation in the uplink (U-plane bearer # 10) with the mobile station UE.
  • the detection unit 11 may be configured to detect such quality degradation in the uplink.
  • the detection unit 11 may be configured to determine the uplink quality based on the received power and reception quality of a PUCCH (Physical Uplink Control Channel) signal and SRS (Sounding Reference Signal).
  • PUCCH Physical Uplink Control Channel
  • SRS Sounding Reference Signal
  • the detection unit 11 may determine that the number of HARQ retransmissions in the uplink exceeds the HARQ maximum number of retransmissions, the number of MAC PDUs exceeding the HARQ maximum number of retransmissions in the uplink exceeds a threshold, The number of PDCP PDU / PDCP SDU / RLC PDU discards exceeded the threshold, the number of PDCP PDU concealment / deciphering failures in the uplink exceeded the threshold, and the PDCP PDU ROHC (header compression in the uplink) ) It may be configured to detect quality degradation in the uplink using the number of failure of expansion or the like as an index.
  • the detection unit 11 adopts the concept of “Time-to-Trigger” or the number of protection stages when determining whether or not the quality of the U-plane signal in the uplink is below a predetermined threshold. It may be configured.
  • the detection unit 11 detects quality degradation in the uplink when the RA procedure is not completed even if the RA procedure is activated a predetermined number of times in the uplink with the mobile station UE. It may be configured.
  • the detection unit 11 may be configured to determine that the RA procedure has been completed, or the “RA response” designated “ When the CRC of PUSCH (Physical Uplink Shared Channel) corresponding to “UL grant” becomes “OK”, it may be configured to determine that the RA procedure is completed.
  • PUSCH Physical Uplink Shared Channel
  • the detection unit 11 performs the above-described uplink PUCCH (Physical Uplink Control Channel) signal, SRS (Sounding Reference Signal), PRACH (Physical Random Access Channel) signal, or the quality of the PUSCH signal or the PUSCH signal. Is configured to detect.
  • PUCCH Physical Uplink Control Channel
  • SRS Sounding Reference Signal
  • PRACH Physical Random Access Channel
  • the notification unit 12 When the detection unit 11 detects quality degradation in the uplink (U-plane bearer # 10) with the mobile station UE, the notification unit 12 performs X2, S1, etc. on the radio base station eNB # 1 A predetermined notification is made via any interface.
  • the predetermined notification may be configured to directly notify that “quality degradation in the uplink has been detected”.
  • the predetermined notification may be configured to notify the identification information (PCI, CGI, ScellIndex, etc.) of the cell in which the quality deterioration is detected.
  • the predetermined notification may be configured to notify the identification information of the radio base station eNB to which the cell in which the quality deterioration is detected belongs.
  • the notification unit 12 notifies the radio base station eNB # 1 of the mobile station
  • the identifier of the U-plane bearer set up with the UE and the request for deleting or resetting the U-plane bearer may be transmitted.
  • Such a request may be configured to be transmitted separately from the above-described predetermined notification, or may be configured to be transmitted by the above-described predetermined notification.
  • the request may be configured to notify “Cause” that “quality degradation in uplink is detected”. Such a request may be configured to notify the identification information of the mobile station UE together.
  • the notification unit 12 transmits and receives a C-plane signal instead of the macro eNB when the detection unit 11 detects quality degradation in the uplink (U-plane bearer # 10) with the mobile station UE. It may be configured to perform a predetermined notification to a small eNB that can.
  • the notification unit 12 After notifying the radio base station eNB # 1, the notification unit 12 performs a predetermined notification on the radio base station eNB # 1 when delivery confirmation information is not received from the radio base station eNB # 1.
  • the notification may be retransmitted, or the predetermined notification may be transmitted to the anchor radio base station eNB other than the radio base station eNB # 1.
  • the anchor radio base station eNB may be notified in advance as to which anchor radio base station eNB is to perform the predetermined notification preferentially.
  • the radio base station eNB # 1 includes a receiving unit 21 and a control unit 22.
  • the receiving unit 21 is configured to receive various signals from the radio base station eNB # 10 and the mobile station UE.
  • the receiving unit 21 is configured to receive the above-described predetermined notification or request from the radio base station eNB # 10 or the mobile station UE.
  • the control unit 22 is configured to re-establish and re-set the corresponding U-plane bearer based on the predetermined notification and request.
  • step S101 the radio base station eNB # 10 determines whether or not quality degradation has occurred in the uplink (U-plane bearer) with the mobile station UE.
  • step S102 If “YES”, the operation proceeds to step S102, and if “NO”, the operation ends.
  • step S102 the radio base station eNB # 10 makes a predetermined notification to the radio base station eNB # 1.
  • the radio base station eNB # 1 performs re-establishment and reconfiguration of the corresponding U-plane bearer based on the predetermined notification.
  • the radio base station eNB # 10 when the radio base station eNB # 10 detects quality degradation in the uplink (U-plane bearer) with the mobile station UE, the radio base station eNB # 1 To that effect.
  • the radio base station eNB # 1 can perform re-establishment and re-configuration of the corresponding U-plane bearer based on the predetermined notification. Therefore, in the “Inter-site CA”, the C-plane signal Communicates with the cell # 1 under the radio base station eNB # 1 via the SRB, and the U-plane signal for the cell # 11 / # 12 under the radio base station eNB # 11 / # 12 via the DRB. Even when the operation of performing communication is performed, the radio base station eNB # 1 can take an appropriate response when the above-described quality degradation is detected.
  • the first feature of the present embodiment is that the mobile station UE has cell # 1 (first cell) and radio base station eNB # 10 (second radio base station) under the control of the radio base station eNB # 1 (first radio base station).
  • a mobile communication system configured to be able to perform “Inter-site CA (carrier aggregation)” via a subordinate cell # 10 (second cell), and the radio base station eNB # 1
  • the mobile station UE is configured to be able to transmit and receive a C-plane signal (control signal) and a U-plane signal (data signal), and the radio base station eNB # 10 is connected to the mobile station UE.
  • Between the mobile station UE and the radio base station eNB # 10 is configured to be able to transmit and receive U-plane signals and not to transmit and receive C-plane signals. Kicking when detecting quality deterioration with respect to the radio base station eNB # 1, and summarized in that is configured to perform a predetermined notification.
  • the radio base station eNB # 10 notifies the radio base station eNB # 1 of the predetermined notification when the signal quality in the uplink is below a predetermined threshold. It may be configured to do.
  • the radio base station eNB # 10 performs the above-described predetermined notification to the radio base station eNB # 1 when the random access procedure is not completed a predetermined number of times. It may be configured.
  • the above-described predetermined notification may be configured to include identification information of a cell in which the above-described quality deterioration is detected.
  • the predetermined notification described above may be configured to include identification information of the radio base station eNB # 2 to which the cell in which the quality deterioration is detected belongs.
  • radio base station eNB # 10 detects the above-mentioned quality degradation, the deletion request
  • the radio base station eNB # 10 when the radio base station eNB # 10 cannot receive the delivery confirmation information for the predetermined notification, the radio base station eNB # 10 retransmits the predetermined notification to the radio base station eNB # 1. It may be configured.
  • the radio base station eNB # 10 when the radio base station eNB # 10 cannot receive the delivery confirmation information for the predetermined notification described above, the radio base station eNB # 10 is directed to a radio base station (anchor radio base station) eNB other than the radio base station eNB.
  • the above-described predetermined notification may be performed.
  • the second feature of the present embodiment is that the mobile station UE performs “Inter-site CA” via the cell # 1 under the radio base station eNB # 1 and the cell # 10 under the radio base station eNB # 10.
  • the radio base station eNB # 1 is configured to be able to transmit and receive C-plane signals and U-plane signals to and from the mobile station UE.
  • the radio base station eNB # 10 is a radio base station eNB # 10 in a mobile communication system configured to be able to transmit / receive U-plane signals to / from mobile stations UE and not to transmit / receive C-plane signals.
  • a radio base station eNB capable of functioning, when a quality degradation in the uplink with the mobile station UE is detected, a predetermined notification to the radio base station eNB # 1 It is summarized as that is configured to perform.
  • the operations of the mobile station UE and the radio base stations eNB # 1 / # 10 described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be a combination of both. May be implemented.
  • the software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM).
  • RAM Random Access Memory
  • flash memory ROM (Read Only Memory)
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM.
  • it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
  • 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 or the radio base station eNB # 1 / # 10. Further, the storage medium and the processor may be provided in the mobile station UE and the radio base stations eNB # 1 / # 10 as discrete components.
  • the C-plane signal is communicated with the cell # 1 under the control of the radio base station eNB # 1 via the SRB, and the U-plane As for the signal, even when the operation of performing communication in the cell # 10 under the control of the radio base station eNB # 10 via the DRB is performed, when the uplink quality degradation in the cell # 10 is detected, It is possible to provide a mobile communication system and a radio base station that can take appropriate measures.

Abstract

In order that even when, in "Inter-site CA", an operation in which regarding a C-plane signal, communication is performed by a cell (#1) that is under the control of a radio base station (eNB#1) via an SRB, and regarding a U-plane signal, communication is performed by a cell (#10) that is under the control of a radio base station (eNB#10) via a DRB is performed, appropriate action is taken if the quality deterioration of the uplink of the cell (#10) is detected, this mobile communication system is configured such that a radio base station (eNB#10) gives a predetermined notice to a radio base station (eNB#1) when detecting the quality deterioration of an uplink to user equipment (UE).

Description

移動通信システム及び無線基地局Mobile communication system and radio base station
　本発明は、移動通信システム及び無線基地局に関する。 The present invention relates to a mobile communication system and a radio base station.
　ＬＴＥ（Ｌｏｎｇ　Ｔｅｒｍ　Ｅｖｏｌｕｔｉｏｎ）方式のＲｅｌｅａｓｅ-１０において、図５（ａ）に示すように、２０ＭＨｚを超える広帯域通信（例えば、１００Ｈｚの通信）を実現するために、同一の無線基地局ｅＮＢ配下の複数のＣＣ（Ｃｏｍｐｏｎｅｎｔ　Ｃａｒｒｉｅｒ：コンポーネントキャリア）を束ねて通信を行うＣＡ（Ｃａｒｒｉｅｒ　Ａｇｇｒｅｇａｔｉｏｎ：キャリアアグリゲーション）が導入された。 In Release-10 of LTE (Long Term Evolution) method, as shown in FIG. 5A, in order to realize broadband communication exceeding 20 MHz (for example, communication at 100 Hz), a plurality of subordinates under the same radio base station eNB CA (Carrier Aggregation: Carrier Aggregation) was introduced which bundles CC (Component Carrier: Component Carrier) to communicate.
　その後、ＬＴＥ方式のＲｅｌｅａｓｅ-１２以降で、「Ｓｍａｌｌ　Ｃｅｌｌ　ｅｎｈａｎｃｅｍｅｎｔ」が提案され、従来よりも更に柔軟なネットワークアーキテクチャの１つとして、異なる無線基地局ｅＮＢ配下のＣＣ（セル）を束ねて通信を行う「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」の導入が検討されている（図５（ｂ）参照）。 Thereafter, “Small Cell enhancement” was proposed in LTE Release 12 and later, and communication is performed by bundling CCs (cells) under different radio base stations eNB as one of the more flexible network architectures than before. The introduction of “Inter-site CA” is under consideration (see FIG. 5B).
　例えば、「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」を用いて、図５（ｂ）に示すように、信頼性の必要なＣ-ｐｌａｎｅ信号については、ＳＲＢ（Ｓｉｇｎａｌｉｎｇ　Ｒａｄｉｏ　Ｂｅａｒｅｒ）を介して無線基地局ｅＮＢ＃１（マクロｅＮＢ）配下のセル＃１（マクロセル）で通信を行い、広帯域通信の必要なＵ-ｐｌａｎｅ信号については、ＤＲＢ（Ｄａｔａ　Ｒａｄｉｏ　Ｂｅａｒｅｒ）を介して無線基地局ｅＮＢ＃１０（スモールｅＮＢ）配下のセル＃１０（スモールセル）で通信を行うといった運用も考えられる。 For example, using “Inter-site CA”, as shown in FIG. 5 (b), a C-plane signal that requires reliability is transmitted via the radio base station eNB # 1 (e.g., via SRB (Signaling Radio Bearer)). The cell # 1 (macro cell) under the control of the macro eNB) communicates with a cell under the radio base station eNB # 10 (small eNB) via DRB (Data Radio Bearer) for U-plane signals that require broadband communication. An operation of performing communication with # 10 (small cell) is also conceivable.
　このように、Ｃ-ｐｌａｎｅ信号については、ＳＲＢを介して無線基地局ｅＮＢ＃１配下のセル＃１で通信を行い、Ｕ-ｐｌａｎｅ信号については、ＤＲＢを介して無線基地局ｅＮＢ＃１０配下のセル＃１０で通信を行う場合、図６に示すように、基本的には、無線基地局ｅＮＢ＃１が、移動局ＵＥと無線基地局ｅＮＢ＃１/無線基地局ｅＮＢ＃１０との間の接続性や設定のハンドリングを行うことが想定される。 As described above, the C-plane signal is communicated with the cell # 1 under the radio base station eNB # 1 via the SRB, and the U-plane signal is communicated with the radio base station eNB # 10 via the DRB. When performing communication in the cell # 10, as shown in FIG. 6, basically, the radio base station eNB # 1 is between the mobile station UE and the radio base station eNB # 1 / radio base station eNB # 10. It is assumed that connectivity and setting handling will be performed.
　かかる場合、基本的には、セル＃１（マクロセル）を信頼性の高いＰｃｅｌｌ（Ｐｒｉｍａｒｙ　Ｃｅｌｌ）に設定し、セル＃１０を付随的なＳｃｅｌｌ（Ｓｅｃｏｎｄａｒｙ　Ｃｅｌｌ）として設定することが想定される。 In such a case, basically, it is assumed that cell # 1 (macro cell) is set as a highly reliable Pcell (Primary Cell) and cell # 10 is set as an accompanying Scell (Secondary Cell).
　また、基本的には、ＬＴＥ方式では、無線基地局ｅＮＢが、移動局ＵＥとの間の上りリンクにおける品質劣化（上りリンクの同期外れ等）を検出するように構成されている。 Basically, in the LTE scheme, the radio base station eNB is configured to detect quality degradation (uplink synchronization loss, etc.) in the uplink with the mobile station UE.
　かかる場合、一般的に、無線基地局ｅＮＢは、他の移動局ＵＥへの干渉やリソースの利用効率の観点から、品質の劣化したセルに対するスケジューリングを停止すべきである。 In such a case, generally, the radio base station eNB should stop scheduling for a cell with deteriorated quality from the viewpoint of interference with other mobile stations UE and resource utilization efficiency.
　仮に、移動局ＵＥとの間の上りリンクにおける品質劣化が検出された場合で、かつ、かかる品質劣化が検出されたセルが「Ｐｃｅｌｌ（Ｐｒｉｍａｒｙ　ｃｅｌｌ）」である場合には、無線基地局ｅＮＢは、ＲＡ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ）手順を起動し、かかる移動局ＵＥが復帰しなければ、「ＲＲＣ　ｃｏｎｎｅｃｔｉｏｎ　ｒｅｌｅａｓｅ」を送信することによって、かかる移動局ＵＥを「ＲＲＣ_ＩＤＬＥ状態」に遷移させるという運用が行われることが考えられる。 If quality degradation in the uplink with the mobile station UE is detected, and the cell in which such quality degradation is detected is “Pcell (Primary cell)”, the radio base station eNB , RA (Random Access) procedure is started, and if the mobile station UE does not return, the mobile station UE is moved to the “RRC_IDLE state” by transmitting “RRC connection release”. Can be considered.
　また、移動局ＵＥとの間の上りリンクにおける品質劣化が検出された場合で、かつ、かかる品質劣化が検出されたセルが「Ｓｃｅｌｌ（Ｓｅｃｏｎｄａｒｙ　ｃｅｌｌ）」である場合には、かかる品質劣化が解消されなければ、無線基地局ｅＮＢは、「ＲＲＣ　ｃｏｎｎｅｃｔｉｏｎ　ｒｅｃｏｎｆｉｇｕｒａｔｉｏｎ」を送信することによって、かかるＳｃｅｌｌを削除する、或いは、かかるＳｃｅｌｌを非アクティブ化（Ｄｅａｃｔｉｖａｔｅ）するという運用が行われることが考えられる。 Further, when quality degradation in the uplink with the mobile station UE is detected and the cell in which such quality degradation is detected is “Scell (Secondary cell)”, the quality degradation is resolved. Otherwise, the radio base station eNB may be operated to delete the Scell or deactivate the Scell by transmitting “RRC connection reconfiguration”.
　すなわち、移動局ＵＥとの間の上りリンクにおける品質劣化が検出された場合には、無線基地局ｅＮＢは、Ｃ-ｐｌａｎｅ信号を用いて、かかる品質劣化が検出されたセルをハンドリングすることが想定される。 That is, when quality degradation in the uplink with the mobile station UE is detected, it is assumed that the radio base station eNB handles a cell in which such quality degradation is detected using the C-plane signal. Is done.
　上述のように、既存のＬＴＥ方式では、図７に示すように、「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」において、Ｃ-ｐｌａｎｅ信号については、ＳＲＢを介して無線基地局ｅＮＢ＃１配下のセル＃１で通信を行い、Ｕ-ｐｌａｎｅ信号については、ＤＲＢを介して無線基地局ｅＮＢ＃１０配下のセル＃１０で通信を行うという運用が行われる場合、無線基地局ｅＮＢ＃１０が、セル＃１０における上りリンクの品質劣化を検出した場合であっても、移動局ＵＥとの間で、Ｃ-ｐｌａｎｅ信号を送受信することができないため、セル＃１０を削除することができず、その結果、移動局ＵＥとの間で、Ｕ-ｐｌａｎｅ信号を送受信することができなくなってしまうという問題点があった。 As described above, in the existing LTE scheme, as shown in FIG. 7, in “Inter-site CA”, the C-plane signal is communicated in the cell # 1 under the radio base station eNB # 1 via the SRB. For the U-plane signal, when operation is performed in which communication is performed in the cell # 10 under the control of the radio base station eNB # 10 via the DRB, the radio base station eNB # 10 is in the uplink in the cell # 10. Cell # 10 cannot be deleted because the C-plane signal cannot be transmitted / received to / from the mobile station UE, and as a result, the mobile station UE The U-plane signal cannot be transmitted / received between the two.
　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、「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」において、Ｃ-ｐｌａｎｅ信号については、ＳＲＢを介して無線基地局ｅＮＢ＃１配下のセル＃１で通信を行い、Ｕ-ｐｌａｎｅ信号については、ＤＲＢを介して無線基地局ｅＮＢ＃１０配下のセル＃１０で通信を行うという運用が行われる場合であっても、セル＃１０における上りリンクの品質劣化が検出された場合に、適切な対応を取ることができる移動通信システム及び無線基地局を提供することを目的とする。 Therefore, the present invention has been made in view of the above-described problems. In “Inter-site CA”, the C-plane signal is communicated in the cell # 1 under the radio base station eNB # 1 via the SRB. For the U-plane signal, even if the operation is performed in which communication is performed in the cell # 10 under the control of the radio base station eNB # 10 via the DRB, the uplink quality degradation in the cell # 10 may occur. An object of the present invention is to provide a mobile communication system and a radio base station that can take appropriate measures when detected.
　本発明の第１の特徴は、移動局が第１無線基地局配下の第１セル及び第２無線基地局配下の第２セルを介してキャリアアグリゲーションを行うことができるように構成されている移動通信システムであって、前記第１無線基地局は、前記移動局との間で、制御信号及びデータ信号を送受信することができるように構成されており、前記第２無線基地局は、前記移動局との間で、データ信号を送受信することができ、制御信号を送受信することができないように構成されており、前記第２無線基地局は、前記移動局との間の上りリンクにおける品質劣化を検出した場合、前記第１無線基地局に対して、所定通知を行うように構成されていることを要旨とする。 The first feature of the present invention is that the mobile station is configured to perform carrier aggregation via the first cell under the first radio base station and the second cell under the second radio base station. In the communication system, the first radio base station is configured to transmit and receive control signals and data signals to and from the mobile station, and the second radio base station The second radio base station is configured to be capable of transmitting / receiving a data signal to / from a station and not to transmit / receive a control signal, and the second radio base station performs quality degradation in an uplink with the mobile station. The gist of the present invention is that a predetermined notification is sent to the first radio base station when the first radio base station is detected.
　本発明の第２の特徴は、移動局が第１無線基地局配下の第１セル及び第２無線基地局配下の第２セルを介してキャリアアグリゲーションを行うことができるように構成されており、該第１無線基地局は、該移動局との間で、制御信号及びデータ信号を送受信することができるように構成されており、該第２無線基地局は、該移動局との間で、データ信号を送受信することができ、制御信号を送受信することができないように構成されている移動通信システムにおいて該第２無線基地局として機能することができる無線基地局であって、前記移動局との間の上りリンクにおける品質劣化を検出した場合、前記第１無線基地局に対して、所定通知を行うように構成されていることを要旨する。 The second feature of the present invention is configured such that the mobile station can perform carrier aggregation via the first cell under the first radio base station and the second cell under the second radio base station, The first radio base station is configured to be able to transmit and receive control signals and data signals to and from the mobile station, and the second radio base station can communicate with the mobile station, A radio base station capable of functioning as the second radio base station in a mobile communication system configured to transmit and receive data signals and not to transmit and receive control signals, The present invention is summarized in that a predetermined notification is made to the first radio base station when quality degradation in the uplink during is detected.
図１は、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。FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. 図２は、本発明の第１の実施形態に係る無線基地局ｅＮＢ＃１０の機能ブロック図である。FIG. 2 is a functional block diagram of the radio base station eNB # 10 according to the first embodiment of the present invention. 図３は、本発明の第１の実施形態に係る無線基地局ｅＮＢ＃１の機能ブロック図である。FIG. 3 is a functional block diagram of the radio base station eNB # 1 according to the first embodiment of the present invention. 図４は、本発明の変更例１に係る無線基地局ｅＮＢ＃１０の動作を示すフローチャートである。FIG. 4 is a flowchart showing an operation of the radio base station eNB # 10 according to the first modification of the present invention. 図５は、従来技術を説明するための図である。FIG. 5 is a diagram for explaining the prior art. 図６は、従来技術を説明するための図である。FIG. 6 is a diagram for explaining the prior art. 図７は、従来技術を説明するための図である。FIG. 7 is a diagram for explaining the prior art.
（本発明の第１の実施形態に係る移動通信システム）
　図１乃至図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について説明する。 (Mobile communication system according to the first embodiment of the present invention)
A mobile communication system according to a first embodiment of the present invention will be described with reference to FIGS.
　図１に示すように、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って、「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」を適用することができるように構成されている。 As shown in FIG. 1, the mobile communication system according to the present embodiment is an LTE mobile communication system, and is configured to be able to apply “Inter-site CA”.
　すなわち、本実施形態に係る移動通信システムでは、移動局ＵＥは、無線基地局ｅＮＢ＃１配下のセル＃１及び無線基地局ｅＮＢ＃１０配下のセル＃１０を介して「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」を行うことができるように構成されている。 That is, in the mobile communication system according to the present embodiment, the mobile station UE performs “Inter-site CA” via the cell # 1 under the radio base station eNB # 1 and the cell # 10 under the radio base station eNB # 10. It is configured to be able to do.
　また、本実施形態に係る移動通信システムは、セル＃１０を管理する無線基地局ｅＮＢ＃１０（スモールｅＮＢ）と、セル＃１を管理する無線基地局ｅＮＢ＃１（マクロｅＮＢ）とを具備している。 The mobile communication system according to the present embodiment includes a radio base station eNB # 10 (small eNB) that manages the cell # 10 and a radio base station eNB # 1 (macro eNB) that manages the cell # 1. ing.
　ここで、セル＃１０は、スモールセル（ファントムセル）であり、セル＃１は、マクロセルである。なお、セル＃１０のカバレッジエリア及びセル＃１のカバレッジエリアは、少なくとも一部で重なるように配置されている。 Here, cell # 10 is a small cell (phantom cell), and cell # 1 is a macro cell. Note that the coverage area of the cell # 10 and the coverage area of the cell # 1 are arranged so as to overlap at least partially.
　無線基地局ｅＮＢ＃１と移動局ＵＥとの間では、Ｃ-ｐｌａｎｅベアラ＃１を介してＣ-ｐｌａｎｅ信号を送受信することができ、Ｕ-ｐｌａｎｅベアラ＃１を介してＵ-ｐｌａｎｅ信号を送受信することができるように構成されている。 Between the radio base station eNB # 1 and the mobile station UE, a C-plane signal can be transmitted / received via the C-plane bearer # 1, and a U-plane signal can be transmitted / received via the U-plane bearer # 1. It is configured to be able to.
　無線基地局ｅＮＢ＃１０と移動局ＵＥとの間では、Ｕ-ｐｌａｎｅベアラ＃１０を介してＵ-ｐｌａｎｅ信号を送受信することができ、Ｃ-ｐｌａｎｅ信号を送受信することができないように構成されている。 Between the radio base station eNB # 10 and the mobile station UE, a U-plane signal can be transmitted / received via the U-plane bearer # 10, and a C-plane signal cannot be transmitted / received. Yes.
　なお、移動局ＵＥは、Ｃ-ｐｌａｎｅベアラ＃１を介して無線基地局ｅＮＢ＃１から受信したＣ-ｐｌａｎｅ信号に基づいて、無線基地局ｅＮＢ＃１０との間で、Ｕ-ｐｌａｎｅベアラ＃１０を設定するように構成されている。 The mobile station UE communicates with the radio base station eNB # 10 based on the C-plane signal received from the radio base station eNB # 1 via the C-plane bearer # 1. Is configured to set.
　図２に示すように、本実施形態に係る無線基地局ｅＮＢ＃１０は、検出部１１と、通知部１２とを具備している。 As shown in FIG. 2, the radio base station eNB # 10 according to the present embodiment includes a detection unit 11 and a notification unit 12.
　検出部１１は、移動局ＵＥとの間の上りリンク（Ｕ-ｐｌａｎｅベアラ＃１０）における品質劣化を検出するように構成されている。 The detection unit 11 is configured to detect quality degradation in the uplink (U-plane bearer # 10) with the mobile station UE.
　例えば、検出部１１は、移動局ＵＥとの間の上りリンクにおけるＵ-ｐｌａｎｅ信号の品質が所定閾値を下回った場合に、かかる上りリンクにおける品質劣化を検出するように構成されていてもよい。 For example, when the quality of the U-plane signal in the uplink with the mobile station UE falls below a predetermined threshold, the detection unit 11 may be configured to detect such quality degradation in the uplink.
　例えば、検出部１１は、ＰＵＣＣＨ（Ｐｈｙｓｉｃａｌ　Ｕｐｌｉｎｋ　Ｃｏｎｔｒｏｌ　Ｃｈａｎｎｅｌ）信号やＳＲＳ（Ｓｏｕｎｄｉｎｇ　Ｒｅｆｅｒｅｎｃｅ　Ｓｉｇｎａｌ）の受信電力や受信品質により、上りリンクの品質を判定するように構成されていてもよい。 For example, the detection unit 11 may be configured to determine the uplink quality based on the received power and reception quality of a PUCCH (Physical Uplink Control Channel) signal and SRS (Sounding Reference Signal).
　或いは、検出部１１は、上りリンクにおけるＨＡＲＱ再送の回数がＨＡＲＱ最大再送回数を超過したことや、上りリンクにおけるＨＡＲＱ最大再送回数を超過したＭＡＣ　ＰＤＵの数が閾値を超過したことや、上りリンクにおけるＰＤＣＰ　ＰＤＵ/ＰＤＣＰ　ＳＤＵ/ＲＬＣ　ＰＤＵの破棄数が閾値を超過したことや、上りリンクにおけるＰＤＣＰ　ＰＤＵの秘匿解匿処理の失敗数が閾値を超過したことや、上りリンクにおけるＰＤＣＰ　ＰＤＵのＲＯＨＣ（ヘッダ圧縮）伸張の失敗数等を指標にして、上りリンクにおける品質劣化を検出するように構成されていてもよい。 Alternatively, the detection unit 11 may determine that the number of HARQ retransmissions in the uplink exceeds the HARQ maximum number of retransmissions, the number of MAC PDUs exceeding the HARQ maximum number of retransmissions in the uplink exceeds a threshold, The number of PDCP PDU / PDCP SDU / RLC PDU discards exceeded the threshold, the number of PDCP PDU concealment / deciphering failures in the uplink exceeded the threshold, and the PDCP PDU ROHC (header compression in the uplink) ) It may be configured to detect quality degradation in the uplink using the number of failure of expansion or the like as an index.
　ここで、検出部１１は、かかる上りリンクにおけるＵ-ｐｌａｎｅ信号の品質が所定閾値を下回るか否かについての判定を行う際に、「Ｔｉｍｅ-ｔｏ-Ｔｒｉｇｇｅｒ」や保護段数という考え方を採用するように構成されていてもよい。 Here, the detection unit 11 adopts the concept of “Time-to-Trigger” or the number of protection stages when determining whether or not the quality of the U-plane signal in the uplink is below a predetermined threshold. It may be configured.
　或いは、検出部１１は、移動局ＵＥとの間の上りリンクにおいて、所定回数、ＲＡ手順を起動しても、かかるＲＡ手順が完了しなかった場合に、かかる上りリンクにおける品質劣化を検出するように構成されていてもよい。 Alternatively, the detection unit 11 detects quality degradation in the uplink when the RA procedure is not completed even if the RA procedure is activated a predetermined number of times in the uplink with the mobile station UE. It may be configured.
　例えば、検出部１１は、上述のＲＡ手順において、「ＲＡ　ｐｒｅａｍｂｌｅ」を受信した場合に、かかるＲＡ手順が完了したと判定するように構成されていてもよいし、「ＲＡ　ｒｅｓｐｏｎｓｅ」で指定した「ＵＬ　ｇｒａｎｔ」に対応するＰＵＳＣＨ（Ｐｈｙｓｉｃａｌ　Ｕｐｌｉｎｋ　Ｓｈａｒｅｄ　Ｃｈａｎｎｅｌ）のＣＲＣが「ＯＫ」となった場合に、かかるＲＡ手順が完了したと判定するように構成されていてもよい。 For example, when the “RA preamble” is received in the above-described RA procedure, the detection unit 11 may be configured to determine that the RA procedure has been completed, or the “RA response” designated “ When the CRC of PUSCH (Physical Uplink Shared Channel) corresponding to “UL grant” becomes “OK”, it may be configured to determine that the RA procedure is completed.
　また、検出部１１は、上述の上りリンクにおけるＰＵＣＣＨ（Ｐｈｙｓｉｃａｌ　Ｕｐｌｉｎｋ　Ｃｏｎｔｒｏｌ　Ｃｈａｎｎｅｌ）信号やＳＲＳ（Ｓｏｕｎｄｉｎｇ　Ｒｅｆｅｒｅｎｃｅ　Ｓｉｇｎａｌ）やＰＲＡＣＨ（Ｐｈｙｓｉｃａｌ　Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｃｈａｎｎｅｌ）信号やＰＵＳＣＨ信号等の任意の信号において、上述の品質劣化を検出するように構成されている。 In addition, the detection unit 11 performs the above-described uplink PUCCH (Physical Uplink Control Channel) signal, SRS (Sounding Reference Signal), PRACH (Physical Random Access Channel) signal, or the quality of the PUSCH signal or the PUSCH signal. Is configured to detect.
　通知部１２は、検出部１１によって移動局ＵＥとの間の上りリンク（Ｕ-ｐｌａｎｅベアラ＃１０）における品質劣化が検出された場合に、無線基地局ｅＮＢ＃１に対して、Ｘ２やＳ１等の任意のインターフェイスを介して、所定通知を行うように構成されている。 When the detection unit 11 detects quality degradation in the uplink (U-plane bearer # 10) with the mobile station UE, the notification unit 12 performs X2, S1, etc. on the radio base station eNB # 1 A predetermined notification is made via any interface.
　例えば、かかる所定通知は、「上りリンクにおける品質劣化が検出されたこと」を直接通知するように構成されていてもよい。 For example, the predetermined notification may be configured to directly notify that “quality degradation in the uplink has been detected”.
　また、かかる所定通知は、上述の品質劣化が検出されたセルの識別情報（ＰＣＩやＣＧＩやＳｃｅｌｌＩｎｄｅｘ等）を通知するように構成されていてもよい。 Further, the predetermined notification may be configured to notify the identification information (PCI, CGI, ScellIndex, etc.) of the cell in which the quality deterioration is detected.
　また、かかる所定通知は、上述の品質劣化が検出されたセルが属する無線基地局ｅＮＢの識別情報を通知するように構成されていてもよい。 In addition, the predetermined notification may be configured to notify the identification information of the radio base station eNB to which the cell in which the quality deterioration is detected belongs.
　或いは、通知部１２は、検出部１１によって移動局ＵＥとの間の上りリンク（Ｕ-ｐｌａｎｅベアラ＃１０）における品質劣化が検出された場合に、無線基地局ｅＮＢ＃１に対して、移動局ＵＥとの間で設定されているＵ-ｐｌａｎｅベアラの識別子及び当該Ｕ-ｐｌａｎｅベアラの削除や再設定の要求を送信するように構成されていてもよい。 Alternatively, when the detection unit 11 detects quality degradation in the uplink (U-plane bearer # 10) with the mobile station UE by the detection unit 11, the notification unit 12 notifies the radio base station eNB # 1 of the mobile station The identifier of the U-plane bearer set up with the UE and the request for deleting or resetting the U-plane bearer may be transmitted.
　かかる要求は、上述の所定通知とは別に送信されるように構成されていてもよいし、上述の所定通知によって送信されるように構成されていてもよい。 Such a request may be configured to be transmitted separately from the above-described predetermined notification, or may be configured to be transmitted by the above-described predetermined notification.
　かかる要求は、「Ｃａｕｓｅ」として「上りリンクにおける品質劣化が検出されたこと」を通知するように構成されていてもよい。また、かかる要求は、移動局ＵＥの識別情報を一緒に通知するように構成されていてもよい。 The request may be configured to notify “Cause” that “quality degradation in uplink is detected”. Such a request may be configured to notify the identification information of the mobile station UE together.
　なお、通知部１２は、検出部１１によって移動局ＵＥとの間の上りリンク（Ｕ-ｐｌａｎｅベアラ＃１０）における品質劣化が検出された場合に、マクロｅＮＢではなく、Ｃ-ｐｌａｎｅ信号を送受信することができるスモールｅＮＢに対して、所定通知を行うように構成されていてもよい。 The notification unit 12 transmits and receives a C-plane signal instead of the macro eNB when the detection unit 11 detects quality degradation in the uplink (U-plane bearer # 10) with the mobile station UE. It may be configured to perform a predetermined notification to a small eNB that can.
　さらに、通知部１２は、無線基地局ｅＮＢ＃１に対して所定通知を行った後、無線基地局ｅＮＢ＃１から送達確認情報が受信されない場合には、無線基地局ｅＮＢ＃１に対して所定通知を再送するように構成されていてもよいし、無線基地局ｅＮＢ＃１以外のアンカー無線基地局ｅＮＢに対して所定通知を送信するように構成されていてもよい。 Furthermore, after notifying the radio base station eNB # 1, the notification unit 12 performs a predetermined notification on the radio base station eNB # 1 when delivery confirmation information is not received from the radio base station eNB # 1. The notification may be retransmitted, or the predetermined notification may be transmitted to the anchor radio base station eNB other than the radio base station eNB # 1.
　かかる場合、どのアンカー無線基地局ｅＮＢに対して優先的に所定通知を行うかについては、アンカー無線基地局ｅＮＢから予め通知されていてもよい。 In such a case, the anchor radio base station eNB may be notified in advance as to which anchor radio base station eNB is to perform the predetermined notification preferentially.
　図３に示すように、本実施形態に係る無線基地局ｅＮＢ＃１は、受信部２１と、制御部２２とを具備している。 As illustrated in FIG. 3, the radio base station eNB # 1 according to the present embodiment includes a receiving unit 21 and a control unit 22.
　受信部２１は、無線基地局ｅＮＢ＃１０や移動局ＵＥから各種信号を受信するように構成されている。 The receiving unit 21 is configured to receive various signals from the radio base station eNB # 10 and the mobile station UE.
　例えば、受信部２１は、無線基地局ｅＮＢ＃１０や移動局ＵＥから、上述の所定通知や要求を受信するように構成されている。 For example, the receiving unit 21 is configured to receive the above-described predetermined notification or request from the radio base station eNB # 10 or the mobile station UE.
　制御部２２は、上述の所定通知や要求に基づいて、該当するＵ-ｐｌａｎｅベアラの再確立や再設定を行うように構成されている。 The control unit 22 is configured to re-establish and re-set the corresponding U-plane bearer based on the predetermined notification and request.
　以下、図４を参照して、本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、本実施形態に係る無線基地局ｅＮＢ＃１０の動作について説明する。 Hereinafter, with reference to FIG. 4, the operation of the mobile communication system according to the present embodiment, specifically, the operation of the radio base station eNB # 10 according to the present embodiment will be described.
　図４に示すように、無線基地局ｅＮＢ＃１０は、ステップＳ１０１において、移動局ＵＥとの間の上りリンク（Ｕ-ｐｌａｎｅベアラ）において品質劣化が発生しているか否かについて判定する。 As shown in FIG. 4, in step S101, the radio base station eNB # 10 determines whether or not quality degradation has occurred in the uplink (U-plane bearer) with the mobile station UE.
　「ＹＥＳ」の場合、本動作は、ステップＳ１０２に進み、「ＮＯ」の場合、本動作は、終了する。 If “YES”, the operation proceeds to step S102, and if “NO”, the operation ends.
　ステップＳ１０２において、無線基地局ｅＮＢ＃１０は、無線基地局ｅＮＢ＃１に対して、所定通知を行う。 In step S102, the radio base station eNB # 10 makes a predetermined notification to the radio base station eNB # 1.
　無線基地局ｅＮＢ＃１は、かかる所定通知に基づいて、該当するＵ-ｐｌａｎｅベアラの再確立や再設定を行う。 The radio base station eNB # 1 performs re-establishment and reconfiguration of the corresponding U-plane bearer based on the predetermined notification.
　本実施形態に係る移動通信システムによれば、無線基地局ｅＮＢ＃１０が、移動局ＵＥとの間の上りリンク（Ｕ-ｐｌａｎｅベアラ）における品質劣化を検出した場合に、無線基地局ｅＮＢ＃１に対して、その旨を通知するように構成されている。 According to the mobile communication system according to the present embodiment, when the radio base station eNB # 10 detects quality degradation in the uplink (U-plane bearer) with the mobile station UE, the radio base station eNB # 1 To that effect.
　その結果、無線基地局ｅＮＢ＃１は、かかる所定通知に基づいて、該当するＵ-ｐｌａｎｅベアラの再確立や再設定を行うことができるため、「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」において、Ｃ-ｐｌａｎｅ信号については、ＳＲＢを介して無線基地局ｅＮＢ＃１配下のセル＃１で通信を行い、Ｕ-ｐｌａｎｅ信号については、ＤＲＢを介して無線基地局ｅＮＢ＃１１/＃１２配下のセル＃１１/＃１２で通信を行うという運用が行われる場合であっても、無線基地局ｅＮＢ＃１は、上述の品質劣化が検出された場合に適切な対応を取ることができる。 As a result, the radio base station eNB # 1 can perform re-establishment and re-configuration of the corresponding U-plane bearer based on the predetermined notification. Therefore, in the “Inter-site CA”, the C-plane signal Communicates with the cell # 1 under the radio base station eNB # 1 via the SRB, and the U-plane signal for the cell # 11 / # 12 under the radio base station eNB # 11 / # 12 via the DRB. Even when the operation of performing communication is performed, the radio base station eNB # 1 can take an appropriate response when the above-described quality degradation is detected.
　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、移動局ＵＥが無線基地局ｅＮＢ＃１（第１無線基地局）配下のセル＃１（第１セル）及び無線基地局ｅＮＢ＃１０（第２無線基地局）配下のセル＃１０（第２セル）を介して「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ（キャリアアグリゲーション）」を行うことができるように構成されている移動通信システムであって、無線基地局ｅＮＢ＃１は、移動局ＵＥとの間で、Ｃ-ｐｌａｎｅ信号（制御信号）及びＵ-ｐｌａｎｅ信号（データ信号）を送受信することができるように構成されており、無線基地局ｅＮＢ＃１０は、移動局ＵＥとの間で、Ｕ-ｐｌａｎｅ信号を送受信することができ、Ｃ-ｐｌａｎｅ信号を送受信することができないように構成されており、無線基地局ｅＮＢ＃１０は、移動局ＵＥとの間の上りリンクにおける品質劣化を検出した場合、無線基地局ｅＮＢ＃１に対して、所定通知を行うように構成されていることを要旨とする。 The first feature of the present embodiment is that the mobile station UE has cell # 1 (first cell) and radio base station eNB # 10 (second radio base station) under the control of the radio base station eNB # 1 (first radio base station). ) A mobile communication system configured to be able to perform “Inter-site CA (carrier aggregation)” via a subordinate cell # 10 (second cell), and the radio base station eNB # 1 The mobile station UE is configured to be able to transmit and receive a C-plane signal (control signal) and a U-plane signal (data signal), and the radio base station eNB # 10 is connected to the mobile station UE. Between the mobile station UE and the radio base station eNB # 10 is configured to be able to transmit and receive U-plane signals and not to transmit and receive C-plane signals. Kicking when detecting quality deterioration with respect to the radio base station eNB # 1, and summarized in that is configured to perform a predetermined notification.
　本実施形態の第１の特徴において、無線基地局ｅＮＢ＃１０は、上述の上りリンクにおける信号の品質が所定閾値を下回った場合に、無線基地局ｅＮＢ＃１に対して、上述の所定通知を行うように構成されていてもよい。 In the first feature of the present embodiment, the radio base station eNB # 10 notifies the radio base station eNB # 1 of the predetermined notification when the signal quality in the uplink is below a predetermined threshold. It may be configured to do.
　本実施形態の第１の特徴において、無線基地局ｅＮＢ＃１０は、所定回数、ランダムアクセス手順が完了しなかった場合に、無線基地局ｅＮＢ＃１に対して、上述の所定通知を行うように構成されていてもよい。 In the first feature of the present embodiment, the radio base station eNB # 10 performs the above-described predetermined notification to the radio base station eNB # 1 when the random access procedure is not completed a predetermined number of times. It may be configured.
　本実施形態の第１の特徴において、上述の所定通知は、上述の品質劣化が検出されたセルの識別情報を含むように構成されていてもよい。 In the first feature of the present embodiment, the above-described predetermined notification may be configured to include identification information of a cell in which the above-described quality deterioration is detected.
　本実施形態の第１の特徴において、上述の所定通知は、上述の品質劣化が検出されたセルが属する無線基地局ｅＮＢ＃２の識別情報を含むように構成されていてもよい。 In the first feature of the present embodiment, the predetermined notification described above may be configured to include identification information of the radio base station eNB # 2 to which the cell in which the quality deterioration is detected belongs.
　本実施形態の第１の特徴において、無線基地局ｅＮＢ＃１０は、上述の品質劣化を検出した場合、無線基地局ｅＮＢ＃１に対して、上述の品質劣化が検出されたベアラについての削除要求又は再設定要求を送信するように構成されていてもよい。 1st characteristic of this embodiment WHEREIN: When radio base station eNB # 10 detects the above-mentioned quality degradation, the deletion request | requirement about the bearer in which the above-mentioned quality degradation was detected with respect to radio base station eNB # 1 Alternatively, it may be configured to transmit a reset request.
　本実施形態の第１の特徴において、無線基地局ｅＮＢ＃１０は、上述の所定通知に対する送達確認情報を受信できない場合、無線基地局ｅＮＢ＃１に対して、かかる所定通知の再送を行うように構成されていてもよい。 In the first feature of the present embodiment, when the radio base station eNB # 10 cannot receive the delivery confirmation information for the predetermined notification, the radio base station eNB # 10 retransmits the predetermined notification to the radio base station eNB # 1. It may be configured.
　本実施形態の第１の特徴において、無線基地局ｅＮＢ＃１０は、上述の所定通知に対する送達確認情報を受信できない場合、無線基地局ｅＮＢ以外の無線基地局（アンカー無線基地局）ｅＮＢに対して、上述の所定通知を行うように構成されていてもよい。 In the first feature of the present embodiment, when the radio base station eNB # 10 cannot receive the delivery confirmation information for the predetermined notification described above, the radio base station eNB # 10 is directed to a radio base station (anchor radio base station) eNB other than the radio base station eNB. The above-described predetermined notification may be performed.
　本実施形態の第２の特徴は、移動局ＵＥが無線基地局ｅＮＢ＃１配下のセル＃１及び無線基地局ｅＮＢ＃１０配下のセル＃１０を介して「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」を行うことができるように構成されており、無線基地局ｅＮＢ＃１は、移動局ＵＥとの間で、Ｃ-ｐｌａｎｅ信号及びＵ-ｐｌａｎｅ信号を送受信することができるように構成されており、無線基地局ｅＮＢ＃１０は、移動局ＵＥとの間で、Ｕ-ｐｌａｎｅ信号を送受信することができ、Ｃ-ｐｌａｎｅ信号を送受信することができないように構成されている移動通信システムにおいて無線基地局ｅＮＢ＃１０として機能することができる無線基地局ｅＮＢであって、移動局ＵＥとの間の上りリンクにおける品質劣化を検出した場合、無線基地局ｅＮＢ＃１に対して、所定通知を行うように構成されていることを要旨とする。 The second feature of the present embodiment is that the mobile station UE performs “Inter-site CA” via the cell # 1 under the radio base station eNB # 1 and the cell # 10 under the radio base station eNB # 10. The radio base station eNB # 1 is configured to be able to transmit and receive C-plane signals and U-plane signals to and from the mobile station UE. The radio base station eNB # 10 is a radio base station eNB # 10 in a mobile communication system configured to be able to transmit / receive U-plane signals to / from mobile stations UE and not to transmit / receive C-plane signals. A radio base station eNB capable of functioning, when a quality degradation in the uplink with the mobile station UE is detected, a predetermined notification to the radio base station eNB # 1 It is summarized as that is configured to perform.
　なお、上述の移動局ＵＥや無線基地局ｅＮＢ＃１/＃１０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 mobile station UE and the radio base stations eNB # 1 / # 10 described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be a combination of both. May be implemented.
　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。 The software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM). 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、移動局ＵＥや無線基地局ｅＮＢ＃１/＃１０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移動局ＵＥや無線基地局ｅＮＢ＃１/＃１０内に設けられていてもよい。 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 or the radio base station eNB # 1 / # 10. Further, the storage medium and the processor may be provided in the mobile station UE and the radio base stations eNB # 1 / # 10 as discrete components.
　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、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。 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 modifications and changes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.
　なお、日本国特許出願第２０１２―２１０８４６号（２０１２年９月２５日出願）の全内容が、参照により、本願明細書に組み込まれている。 Note that the entire content of Japanese Patent Application No. 2012-210846 (filed on September 25, 2012) is incorporated herein by reference.
　以上説明したように、本発明によれば、「Ｉｎｔｅｒ-ｓｉｔｅ　ＣＡ」において、Ｃ-ｐｌａｎｅ信号については、ＳＲＢを介して無線基地局ｅＮＢ＃１配下のセル＃１で通信を行い、Ｕ-ｐｌａｎｅ信号については、ＤＲＢを介して無線基地局ｅＮＢ＃１０配下のセル＃１０で通信を行うという運用が行われる場合であっても、セル＃１０における上りリンクの品質劣化が検出された場合に、適切な対応を取ることができる移動通信システム及び無線基地局を提供することができる。 As described above, according to the present invention, in “Inter-site CA”, the C-plane signal is communicated with the cell # 1 under the control of the radio base station eNB # 1 via the SRB, and the U-plane As for the signal, even when the operation of performing communication in the cell # 10 under the control of the radio base station eNB # 10 via the DRB is performed, when the uplink quality degradation in the cell # 10 is detected, It is possible to provide a mobile communication system and a radio base station that can take appropriate measures.
ｅＮＢ＃１、ｅＮＢ＃１０…無線基地局
ＵＥ…移動局
１１…検出部
１２…制御部
２１…受信部
２２…制御部 eNB # 1, eNB # 10 ... radio base station UE ... mobile station 11 ... detection unit 12 ... control unit 21 ... reception unit 22 ... control unit

Claims (9)

  1. 　移動局が第１無線基地局配下の第１セル及び第２無線基地局配下の第２セルを介してキャリアアグリゲーションを行うことができるように構成されている移動通信システムであって、
    　前記第１無線基地局は、前記移動局との間で、制御信号及びデータ信号を送受信することができるように構成されており、
    　前記第２無線基地局は、前記移動局との間で、データ信号を送受信することができ、制御信号を送受信することができないように構成されており、
    　前記第２無線基地局は、前記移動局との間の上りリンクにおける品質劣化を検出した場合、前記第１無線基地局に対して、所定通知を行うように構成されていることを特徴とする移動通信システム。     A mobile communication system configured such that a mobile station can perform carrier aggregation via a first cell under a first radio base station and a second cell under a second radio base station,
    The first radio base station is configured to be able to transmit and receive control signals and data signals to and from the mobile station,
    The second radio base station is configured to be able to transmit / receive data signals to / from the mobile station and not to transmit / receive control signals,
    The second radio base station is configured to perform a predetermined notification to the first radio base station when quality degradation in the uplink with the mobile station is detected. Mobile communication system.
  2. 　前記第２無線基地局は、前記上りリンクにおける信号の品質が所定閾値を下回った場合に、前記第１無線基地局に対して、前記所定通知を行うように構成されていることを特徴とする請求項１に記載の移動通信システム。 The second radio base station is configured to perform the predetermined notification to the first radio base station when the signal quality in the uplink falls below a predetermined threshold. The mobile communication system according to claim 1.
  3. 　前記第２無線基地局は、所定回数、ランダムアクセス手順が完了しなかった場合に、前記第１無線基地局に対して、前記所定通知を行うように構成されていることを特徴とする請求項１に記載の移動通信システム。 The second radio base station is configured to perform the predetermined notification to the first radio base station when a random access procedure is not completed a predetermined number of times. The mobile communication system according to 1.
  4. 　前記所定通知は、前記品質劣化が検出されたセルの識別情報を含むことを特徴とする請求項１乃至３のいずれか一項に記載の移動通信システム。 The mobile communication system according to any one of claims 1 to 3, wherein the predetermined notification includes identification information of a cell in which the quality deterioration is detected.
  5. 　前記所定通知は、前記品質劣化が検出されたセルが属する前記第２無線基地局の識別情報を含むことを特徴とする請求項１乃至３のいずれか一項に記載の移動通信システム。 The mobile communication system according to any one of claims 1 to 3, wherein the predetermined notification includes identification information of the second radio base station to which the cell in which the quality deterioration is detected belongs.
  6. 　前記第２無線基地局は、前記品質劣化を検出した場合、前記第１無線基地局に対して、前記品質劣化が検出されたベアラについての削除要求又は再設定要求を送信するように構成されていることを特徴とする請求項１に記載の移動通信システム。 When the second radio base station detects the quality degradation, the second radio base station is configured to transmit, to the first radio base station, a deletion request or a reset request for the bearer in which the quality degradation is detected. The mobile communication system according to claim 1, wherein:
  7. 　前記第２無線基地局は、前記所定通知に対する送達確認情報を受信できない場合、前記第１無線基地局に対して、前記所定通知の再送を行うように構成されていることを特徴とする請求項１乃至３のいずれか一項に記載の移動通信システム。 The second radio base station is configured to retransmit the predetermined notification to the first radio base station when the delivery confirmation information for the predetermined notification cannot be received. The mobile communication system according to any one of 1 to 3.
  8. 　前記第２無線基地局は、前記所定通知に対する送達確認情報を受信できない場合、前記第１無線基地局以外の無線基地局に対して、前記所定通知を行うように構成されていることを特徴とする請求項１乃至３のいずれか一項に記載の移動通信システム。 The second radio base station is configured to perform the predetermined notification to a radio base station other than the first radio base station when the delivery confirmation information for the predetermined notification cannot be received. The mobile communication system according to any one of claims 1 to 3.
  9. 　移動局が第１無線基地局配下の第１セル及び第２無線基地局配下の第２セルを介してキャリアアグリゲーションを行うことができるように構成されており、該第１無線基地局は、該移動局との間で、制御信号及びデータ信号を送受信することができるように構成されており、該第２無線基地局は、該移動局との間で、データ信号を送受信することができ、制御信号を送受信することができないように構成されている移動通信システムにおいて該第２無線基地局として機能することができる無線基地局であって、
    　前記移動局との間の上りリンクにおける品質劣化を検出した場合、前記第１無線基地局に対して、所定通知を行うように構成されていることを特徴とする無線基地局。     The mobile station is configured to be able to perform carrier aggregation via the first cell under the first radio base station and the second cell under the second radio base station, and the first radio base station The control signal and the data signal can be transmitted / received to / from the mobile station, and the second radio base station can transmit / receive the data signal to / from the mobile station, A radio base station capable of functioning as the second radio base station in a mobile communication system configured not to be able to transmit and receive control signals,
    A radio base station configured to perform a predetermined notification to the first radio base station when quality degradation in an uplink with the mobile station is detected.
PCT/JP2013/072053 2012-09-25 2013-08-19 Mobile communication system and radio base station WO2014050355A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-210846 2012-09-25
JP2012210846A JP6105885B2 (en) 2012-09-25 2012-09-25 Mobile communication system and radio base station

Publications (1)

Publication Number Publication Date
WO2014050355A1 true WO2014050355A1 (en) 2014-04-03

Family

ID=50387766

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/072053 WO2014050355A1 (en) 2012-09-25 2013-08-19 Mobile communication system and radio base station

Country Status (2)

Country Link
JP (1) JP6105885B2 (en)
WO (1) WO2014050355A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020072417A (en) * 2018-11-01 2020-05-07 ソフトバンク株式会社 Mobile station, flight vehicle and mobile communication system
CN116321324A (en) * 2023-04-27 2023-06-23 荣耀终端有限公司 Communication method and related equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011052774A1 (en) * 2009-11-02 2011-05-05 京セラ株式会社 Wireless communication system, low-power base station, high-power base station, wireless terminal, and wireless communication method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007129593A (en) * 2005-11-04 2007-05-24 Ntt Docomo Inc Data transfer method and base station
JP2010178237A (en) * 2009-02-02 2010-08-12 Sharp Corp Communication system and base station device, terminal device, and base station device, and program executed by terminal device
EP2320592B1 (en) * 2009-11-06 2013-05-29 Fujitsu Limited An uplink H-ARQ signalling mechanism in a wireless communication system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011052774A1 (en) * 2009-11-02 2011-05-05 京セラ株式会社 Wireless communication system, low-power base station, high-power base station, wireless terminal, and wireless communication method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BENJEBBOUR ANASS ET AL.: "Conceptual Views and Radio Access Technologies for Future Evolution of LTE-A", IEICE TECHNICAL REPORT, RADIO COMMUNICATION SYSTEMS (RCS2012-100), vol. 112, no. 192, August 2012 (2012-08-01), pages 25 - 30 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020072417A (en) * 2018-11-01 2020-05-07 ソフトバンク株式会社 Mobile station, flight vehicle and mobile communication system
CN116321324A (en) * 2023-04-27 2023-06-23 荣耀终端有限公司 Communication method and related equipment
CN116321324B (en) * 2023-04-27 2023-10-13 荣耀终端有限公司 Communication method and related equipment

Also Published As

Publication number Publication date
JP6105885B2 (en) 2017-03-29
JP2014068118A (en) 2014-04-17

Similar Documents

Publication Publication Date Title
JP6603297B2 (en) Apparatus and method for handling communication
US10039086B2 (en) Communication method and apparatus in network environment where terminal may have dual connectivity to multiple base stations
JP5707395B2 (en) Random access method of terminal in mobile aggregation type mobile communication system
JP5634507B2 (en) Random access method of terminal in mobile aggregation type mobile communication system
US8774108B2 (en) Method of releasing radio bearer in wireless communication system and receiver
US9113385B2 (en) Method and arrangements for reducing the number of failed handover procedures
US10986032B2 (en) Radio communication device and radio communication method for switching from dual connectivity to single connectivity
US8811425B2 (en) Mobile communication method, radio base station, and mobile station
WO2011113324A1 (en) Method and relay node for processing backhaul link error
US20150304903A1 (en) Mobile communication method and mobile station
US9332437B2 (en) Security configuration alignment
US9485005B2 (en) Mobile station and radio base station
EP3313117B1 (en) Device and method of handling tight interworking of lte and 5g
WO2014041962A1 (en) Mobile communication system, radio base station and mobile station
JP6105885B2 (en) Mobile communication system and radio base station
WO2014054722A1 (en) Wireless base station and mobile station
JP6154160B2 (en) Mobile communication system and radio base station
KR102049392B1 (en) Method and apparatus of configuring radio link control layer in wireless communication system
JP6174343B2 (en) Network device and mobile station
JP7050721B2 (en) Wireless communication device and control method
JP2016001930A (en) Mobile communication system, radio base station and mobile station

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13840599

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13840599

Country of ref document: EP

Kind code of ref document: A1