WO2014156969A1 - Station mobile et station de base radio - Google Patents

Station mobile et station de base radio Download PDF

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Publication number
WO2014156969A1
WO2014156969A1 PCT/JP2014/057796 JP2014057796W WO2014156969A1 WO 2014156969 A1 WO2014156969 A1 WO 2014156969A1 JP 2014057796 W JP2014057796 W JP 2014057796W WO 2014156969 A1 WO2014156969 A1 WO 2014156969A1
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WO
WIPO (PCT)
Prior art keywords
csi
mobile station
radio base
base station
resources
Prior art date
Application number
PCT/JP2014/057796
Other languages
English (en)
Japanese (ja)
Inventor
高橋　秀明
聡 永田
佑太 寒河江
Original Assignee
株式会社Ｎｔｔ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Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Publication of WO2014156969A1 publication Critical patent/WO2014156969A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to a mobile station and a radio base station.
  • the radio base station eNB When downlink CoMP transmission processing is performed, the radio base station eNB is configured to set a plurality of CSI (Channel State Information) processes for the mobile station UE connected to the subordinate cell. .
  • CSI Channel State Information
  • the mobile station UE is configured to report CSI to the radio base station eNB for each set CSI process.
  • the mobile station UE uses “CRS (Cell Specific Reference Signal)” as “RSRP (Reference Signal Received Power) / RSRQ (Reference Signal Receive)”. It is configured to measure and report CSI based on the results.
  • CRS Cell Specific Reference Signal
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Receive
  • 3GPP TR 36.819 “Coordinated Multi-Point Operation for LTE Physical Layer Aspects”
  • CSI-RS Channel State Information Reference Signal
  • the radio base station eNB uses the resource to set CSI-RS. It is considered that the mobile station UE measures RSRP / RSRQ based on the CSI-RS.
  • the radio base station eNB transmits the resource # 2 (or CSI-RS) for a specific mobile station UE in the cell # 1 (or cell # 2). If resource # 3) is set, resource # 4 (or resource # 1) corresponding to resource # 2 (or resource # 3) in cell # 2 (or cell # 1) Then, it is configured not to transmit anything.
  • FIG. 11B shows the relationship between the serving cell and the interference cell in each CSI-RS resource.
  • the radio base station eNB needs to set all CSI-RS resources expected to report CSI to the mobile station UE, and transmit the CSI-RS in such resources. There was a problem that it was a load for the base station eNB.
  • the radio base station eNB can secure (pool) resources to be allocated as resources for CSI-RS, and can allocate each resource to a mobile station UE with good quality in the resource.
  • the present invention has been made in view of the above-described problems, and a mobile station and a radio base that can reduce the processing load of the radio base station in a case where the mobile station reports CSI based on CSI-RS.
  • the purpose is to provide a station.
  • a first feature of the present invention is a mobile station, and among resources for CSI-RS secured to the mobile station by a radio base station, a resource to which CSI-RS is not transmitted is used.
  • the gist is to include a measuring unit configured to measure wireless quality.
  • a second feature of the present invention is a radio base station configured to manage resources not transmitting CSI-RS among CSI-RS resources reserved for mobile stations. And a transmitter configured to transmit measurement target information for notifying the mobile station of resources not transmitting the CSI-RS.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to an embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the radio base station according to the embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of CSI-RS resources reserved by the radio base station according to the embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an example of an information element “MeasObjectEUTRA” transmitted by the radio base station according to the embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example of an information element “MeasObjectEUTRA” transmitted by the radio base station according to the embodiment of the present invention.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to an embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the radio base station according to the embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of CSI-RS resources reserved by the radio base station according to the embodiment of the present invention.
  • FIG. 4 is
  • FIG. 6 is a diagram illustrating an example of an information element “MeasResults” transmitted by the radio base station according to the embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an example of an information element “MeasResults” transmitted by the radio base station according to the embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an example of the information element “CSI-RS-ConfigZP” in the information element “MeasResults” transmitted by the radio base station according to the embodiment of the present invention.
  • FIG. 9 is a diagram showing an example of the information element “CSI-RS-IdentityZP” in the information element “CSI-RS-ConfigZP” in the information element “MeasResults” transmitted by the radio base station according to the embodiment of the present invention. It is.
  • FIG. 10 is a functional block diagram of a mobile station according to the embodiment of the present invention.
  • FIG. 11 is a diagram for explaining the prior art.
  • Mobile communication system according to an embodiment of the present invention
  • or FIG. 10 the mobile communication system which concerns on embodiment of this invention is demonstrated.
  • an LTE mobile communication system will be described as an example of the mobile communication system according to the present embodiment, but the present invention is also applicable to mobile communication systems other than the LTE system.
  • the mobile communication system according to the present embodiment is configured to be able to perform downlink CoMP transmission processing.
  • the mobile communication system according to the present embodiment is configured to be able to provide downlink CoMP transmission processing in cells # 1 and # 2. That is, it is assumed that cells # 1 and # 2 are configured to be a support area for CoMP transmission processing in the downlink.
  • cells # 1 and # 2 may be managed by the same radio base station eNB, or may be managed by different radio base stations eNB. Further, cells # 1 and # 2 are assumed to have different coverage areas.
  • the cells # 1 and # 2 may be macro cells, or may be small cells that geographically overlap the macro cells.
  • the radio base station eNB includes a management unit 11, a transmission unit 12, and a reception unit 13.
  • the management unit 11 is configured to manage CSI-RS resources reserved for each mobile station UE in the cells # 1 and # 2.
  • the management unit 11 is configured to manage whether or not CSI-RS is transmitted in the CSI-RS resource reserved for each mobile station UE.
  • the management unit 11 is configured to manage resources that are not transmitting CSI-RS among CSI-RS resources reserved for each mobile station UE.
  • the radio base station eNB secures and sets a hatched CSI-RS resource in the cell # 1 for the mobile station UE, and transmits the CSI-RS in the set resource. Configured to do. Further, the management unit 11 is configured to secure CSI-RS resources # 1 to # 4 in the cell # 2 for the mobile station UE.
  • the transmission unit 12 is configured to transmit various signals to each mobile station UE
  • the reception unit 13 is configured to receive various signals from each mobile station UE.
  • the transmission unit 12 is configured to transmit CRS in the cells # 1 and # 2.
  • the CRS is a reference signal defined in the LTE Rel-8 / 9 scheme, and is a reference signal that is commonly set for all the mobile stations UE in each cell.
  • the transmission unit 12 is configured to be able to transmit CSI-RS using the set resource among the CSI-RS resources reserved for each mobile station UE in the cells # 1 and # 2.
  • the CSI-RS is a reference signal defined by the LTE Rel-10 scheme.
  • the transmission unit 12 transmits the CSI-RS in all of the CSI-RS resources # 1 to # 4 reserved for each mobile station UE in the cells # 1 and # 2. Absent.
  • the transmission unit 12 informs the mobile station UE of resources not transmitting the CSI-RS among the CSI-RS resources reserved for each mobile station UE, the information element “MeasObjectEUTRA” Is configured to send.
  • the transmission unit 12 is configured to notify the CSI-RS resources # 1 to # 4 using the information element “MeasObjectEUTRA”.
  • the transmission unit 12 uses “CSI-RS-ConfigZPToAddModList-r11” and “CSI-RS-ConfigZPToReleaseList-r11” in the information element “MeasObjectEUTRA”. It is configured to notify the above resources.
  • the receiving unit 13 is configured to receive “Measurement Report” generated based on the radio quality measured by the mobile station UE.
  • the “Measurement Report” is configured to include an information element “MeasResults”.
  • the information element “MeasResults” is configured to specify a resource used for measurement of radio quality by the mobile station UE.
  • the information element “CSI-RS-IdentityZP (see FIG. 9)” in the information element “CSI-RS-ConfigZP (see FIG. 8)” in the information element “MeasResults (see FIGS. 6 and 7)”. is configured to designate a resource used for radio quality measurement by the mobile station UE.
  • the mobile station UE includes a reception unit 21, a measurement unit 22, and a transmission unit 23.
  • the receiving unit 21 is configured to receive various signals from the radio base station eNB.
  • the receiving unit 21 is configured to receive the CSI-RS in the CSI-RS resource reserved for the mobile station UE by the radio base station eNB.
  • the receiving unit 21 is a resource other than the resource that does not transmit the CSI-RS notified by the information element “MeasObjectEUTRA” among the CSI-RS resources reserved for the mobile station UE by the radio base station eNB. In this resource, CSI-RS may be received.
  • the measurement unit 22 measures radio quality (RSRP or RSRQ) using a resource for which CSI-RS is not transmitted among resources for CSI-RS secured to the mobile station UE by the radio base station eNB. It is configured as follows.
  • the measurement unit 22 is configured to measure the radio quality (RSRP or RSRQ) in any of the resources # 1 to # 4. Note that the measurement unit 22 may be configured to measure radio quality (RSRP or RSRQ) in a plurality of resources among the resources # 1 to # 4.
  • the transmission unit 23 is configured to transmit “Measurement Report” generated based on the above-described radio quality (RSRP or RSRQ) to the radio base station eNB.
  • RSRP radio quality
  • RSRQ radio quality
  • the “Measurement Report” is configured to include the information element “MeasResults” illustrated in FIGS. 6 and 7.
  • the transmission unit 23 performs the information element “CSI-RS-IdentityZP () in the information element“ CSI-RS-ConfigZP (see FIG. 8) ”in the information element“ MeasResults (see FIGS. 6 and 7) ”.
  • the mobile station UE is configured to designate resources used for radio quality measurement.
  • the first feature of the present embodiment is the mobile station UE, and among the CSI-RS resources reserved for the mobile station UE by the radio base station eNB, resources for which CSI-RS is not transmitted
  • the gist is to include a measuring unit 22 configured to measure the wireless quality.
  • the mobile station UE uses the resources for which the CSI-RS is not transmitted among the CSI-RS resources reserved for the mobile station UE by the radio base station eNB, to improve the radio quality. Since it is configured to measure, it is not necessary for the radio base station eNB to transmit CSI-RS in all of the CSI-RS resources reserved for the mobile station UE, and the load on the radio base station eNB Can be reduced.
  • the mobile station UE includes a receiving unit 21 configured to acquire an information element “MeasObjectEUTRA (measurement target information)” that specifies a resource for which CSI-RS is not transmitted. Further, the measurement unit 22 may be configured to measure the radio quality using the resource specified by “MeasObjectEUTRA”.
  • MeasObjectEUTRA measurement target information
  • the mobile station UE diverts the existing information element “MeasObjectEUTRA”, and among the CSI-RS resources reserved for the mobile station UE, the resource for which the CSI-RS is not transmitted. Can be grasped.
  • the mobile station UE is configured to transmit a “Measurement Report” generated based on the above-described radio quality to the radio base station eNB.
  • the unit 23 may be further configured, and the “Measurement Report” may be configured to specify a resource used for the measurement of the wireless quality.
  • the radio base station eNB determines whether the CSI-RS is secured to the mobile station UE from among the resources for which the CSI-RS is not transmitted, by the mobile station UE. It is possible to know the resource that performed the measurement of the wireless quality.
  • the second feature of the present embodiment is a radio base station eNB that manages resources that do not transmit CSI-RS among resources for CSI-RS reserved for the mobile station UE.
  • a management unit 11 configured; and a transmission unit 12 configured to transmit to the mobile station UE an information element “MeasObjectEUTRA” notifying a resource not transmitting the CSI-RS. Is the gist.
  • the radio base station eNB notifies the mobile station UE of resources that are not transmitting CSI-RS among the CSI-RS resources reserved for the mobile station UE. Therefore, it is not necessary to transmit the CSI-RS in all of the CSI-RS resources, and a complicated procedure for changing the mobile station UE to which the CSI-RS resources are allocated can be avoided.
  • the radio base station eNB further includes a reception unit 23 configured to receive “Measurement Report” generated based on the radio quality measured by the mobile station UE.
  • the “Measurement Report” may be configured to designate a resource used for measurement of radio quality by the mobile station UE.
  • the radio base station eNB determines whether the CSI-RS is secured to the mobile station UE from among the resources for which the CSI-RS is not transmitted, by the mobile station UE. It is possible to know the resource that performed the measurement of the wireless quality.
  • radio base station eNB and the mobile station UE 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. .
  • 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 radio base station eNB or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB or the mobile station UE.
  • the present invention it is possible to provide a mobile station and a radio base station that can reduce the processing load of the radio base station when the mobile station reports CSI based on CSI-RS. it can.
  • eNB radio base station UE ... mobile station 11 ... management unit 12, 23 ... transmitting unit 13, 21 ... receiving unit 22 ... measuring unit

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

Abstract

La présente invention a pour objet de réduire la charge de traitement d'une station de base radio dans le cas où une station mobile signale des CSI (Channel State Information, informations d'état du canal) sur la base d'un CSI-RS. Une station mobile (UE) de la présente invention comprend une unité de mesure (22) configurée pour mesurer une qualité radio en utilisant celle des ressources CSI-RS réservées par une station de base radio (eNB) pour la station mobile (UE) par l'intermédiaire de laquelle aucun CSI-RS n'a été transmis.
PCT/JP2014/057796 2013-03-25 2014-03-20 Station mobile et station de base radio WO2014156969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-062971 2013-03-25
JP2013062971A JP2014187660A (ja) 2013-03-25 2013-03-25 移動局及び無線基地局

Publications (1)

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WO2014156969A1 true WO2014156969A1 (fr) 2014-10-02

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PCT/JP2014/057796 WO2014156969A1 (fr) 2013-03-25 2014-03-20 Station mobile et station de base radio

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WO (1) WO2014156969A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013021531A1 (fr) * 2011-08-05 2013-02-14 パナソニック株式会社 Terminal, dispositif d'émission, procédé de rapport de qualité de réception et procédé de réception

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013021531A1 (fr) * 2011-08-05 2013-02-14 パナソニック株式会社 Terminal, dispositif d'émission, procédé de rapport de qualité de réception et procédé de réception

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NTT DOCOMO: "Enhanced Interference Measurement Mechanisms for Rel. 11", 3GPP TSG RAN WG1 MEETING #70BIS, RL-124253, October 2012 (2012-10-01), pages 1 - 9 *

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