WO2012165475A1 - Procédé de communication mobile et station de base sans fil - Google Patents

Procédé de communication mobile et station de base sans fil Download PDF

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Publication number
WO2012165475A1
WO2012165475A1 PCT/JP2012/063922 JP2012063922W WO2012165475A1 WO 2012165475 A1 WO2012165475 A1 WO 2012165475A1 JP 2012063922 W JP2012063922 W JP 2012063922W WO 2012165475 A1 WO2012165475 A1 WO 2012165475A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
radio base
enb
interference level
interference
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2012/063922
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English (en)
Japanese (ja)
Inventor
高橋　秀明
岡本　健志
哲士 阿部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
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 NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of WO2012165475A1 publication Critical patent/WO2012165475A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L5/0001—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) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control

Definitions

  • the present invention relates to a mobile communication method and a radio base station.
  • a radio base station eNB communicates with an adjacent radio base station eNB in the frequency domain (Frequency Domain), and PRB (Physical Resource Block) in the uplink:
  • a method of exchanging information related to a PRB having a high interference level and avoiding scheduling to a PRB having a high interference level is defined as “High interference PRB” in units of physical resource blocks).
  • the mobile station UE is configured to be able to perform CA (Carrier Aggregation) communication using a plurality of carriers (CC: Component Carrier) under one radio base station eNB. Yes.
  • CA Carrier Aggregation
  • ICIC Inter Cell Interference Coordination
  • the radio base station eNB is configured to notify “High interference PRB” in units of PRB in the uplink, and therefore, interference in CC units between adjacent radio base stations eNB.
  • the level ie, the interference level of the entire system bandwidth
  • the interference level in the downlink cannot be exchanged between adjacent radio base stations eNB.
  • the conventional method for exchanging the interference level between adjacent radio base stations in the LTE system has a problem in that “ICIC” in units of CCs in the frequency domain in the above-described CA communication cannot be realized.
  • the present invention has been made in view of the above-described problems, and provides a mobile communication method and a radio base station capable of exchanging interference levels in CC units between adjacent radio base stations eNB. Objective.
  • a first feature of the present invention is a mobile communication method in which a mobile station performs communication using a plurality of carriers under the control of a radio base station, wherein the radio base station The gist is to have a step of notifying the interference level for each carrier included in each carrier for each downlink and uplink.
  • a second feature of the present invention is a radio base station used in a mobile communication system configured such that a mobile station can perform communication using a plurality of carriers under the radio base station,
  • the gist of the invention is that the wireless base station includes a transmission unit configured to notify an interference level for each carrier included in the plurality of carriers for each downlink and uplink.
  • 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 according to the first embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a format of “Load Information” used in the mobile communication system according to the first embodiment of the present invention.
  • FIG. 4 is a diagram showing an example of a “Load Information” format used in the mobile communication system according to the first embodiment of the present invention.
  • FIG. 5 is a diagram for explaining a conventional mobile communication system.
  • Mobile communication system Mobile communication system according to the first embodiment of the present invention
  • or FIG. 3 the mobile communication system which concerns on the 1st 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 “ICIC” in order to reduce interference between cells, for example.
  • the mobile communication system includes a radio base station eNB # 1 that manages cell # 1 and a radio base station eNB # 2 that manages cell # 2.
  • the cells # 1 and # 2 may be macro cells or CSG (Closed Subscriber Group) cells.
  • the CSG cell may be referred to as a femto cell, a micro cell, a pico cell, or the like.
  • an X2 connection can be set between the radio base station eNB # 1 and the radio base station eNB # 2.
  • the mobile station UE is configured to perform CA communication using a plurality of CCs under the control of the radio base stations eNB # 1 / eNB # 2.
  • the mobile station UE uses CC # 11a and CC # 11b as downlink CCs and CC # 12a and CCs as uplink CCs under the radio base station eNB # 1.
  • CA communication is performed using # 12b.
  • the interference level of CC # 11a and CC # 12a is high.
  • radio base station eNB # 1 Since the functions of the radio base station eNB # 1 and the radio base station eNB # 2 are basically the same, the function of the radio base station eNB # 1 will be described below as a representative.
  • the radio base station eNB # 1 includes a reception unit 11, a transmission unit 12, and a CA control unit 13.
  • the receiving unit 11 is configured to receive various signals from the mobile station UE and the surrounding radio base station eNB (for example, the radio base station eNB # 2).
  • the receiving unit 11 is configured to receive information related to the CC interference level in the peripheral radio base station eNB from the peripheral radio base station eNB (for example, the radio base station eNB # 2).
  • the receiving unit 11 is configured to receive information related to the CC interference level in the neighboring radio base station eNB for each downlink and uplink for each CC (E-CGI: Enhanced-Cell Global Identity). ing.
  • the receiving unit 11 is configured to receive information related to the CC interference level in the surrounding radio base station eNB by “Load Information” shown in FIG. 3 or FIG.
  • the transmission unit 12 is configured to transmit various signals to the mobile station UE and the surrounding radio base station eNB (for example, the radio base station eNB # 2).
  • the transmission unit 12 is configured to transmit information related to the CC interference level in the radio base station eNB # 1 to the neighboring radio base station eNB (for example, the radio base station eNB # 2). ing.
  • the transmission unit 12 is configured to transmit information related to the CC interference level in the radio base station eNB # 1 for each CC (E-CGI) for each downlink and uplink.
  • the receiving unit 11 is configured to receive information related to the CC interference level in the radio base station eNB # 1 by “Load Information” shown in FIG. 3 or FIG.
  • the “Load Information” shown in FIG. 3 is added to the information element “UL Information Overload Indication (system bandwidth) under the information element“ Cell Information Item ”in addition to the information element defined in“ 3GPP TS36.423 ”. Overall)) and the information element “DL Interference Overload Indication (the entire system bandwidth)”.
  • the information element “UL Interference Overload Indication (entire system bandwidth)” includes “high interference (high interference level)”, “medium” as the uplink interference level in the CC specified by “Cell ID (E-CGI)”. Either “interference (interference level)” or “low interference (interference level low)” can be set.
  • DL Interference Overload Indication (entire system bandwidth)”, “high interference (interference level high)”, “medium” is set as the downlink interference level in the CC specified by “Cell ID (E-CGI)”. Either “interference (interference level)” or “low interference (interference level low)” can be set.
  • “Load Information” shown in FIG. 3 is subordinate to the information element “Cell Information Item” and the information element “UL High Information Indication (system whole bandwidth)” ) ”And an information element“ DL High Interference Indication (the entire system bandwidth) ”.
  • the information element “UL High Interference Indication (entire system bandwidth)” includes “true (high interference level)” and “false” as the uplink interference level in the CC specified by “Cell ID (E-CGI)”. Any of “interference level low)” can be set.
  • the information element “DL High Interference Indication (entire system bandwidth)” includes “true (high interference level)” and “false” as downlink interference levels in the CC specified by “Cell ID (E-CGI)”. Any of “interference level low)” can be set.
  • the “Load Information” shown in FIG. 4 is subordinate to the information element “Cell Information Item” and the information element “DL Interface Overload Indication (system wholebandwidth)”. ) ”And an information element“ DL High Interference Indication (the entire system bandwidth) ”.
  • DL Interference Overload Indication (entire system bandwidth)”, “high interference (interference level high)”, “medium” is set as the downlink interference level in the CC specified by “Cell ID (E-CGI)”. Either “interference (interference level)” or “low interference (interference level low)” can be set.
  • the information element “DL High Interference Indication (entire system bandwidth)” includes “true (high interference level)” and “false” as downlink interference levels in the CC specified by “Cell ID (E-CGI)”. Any of “interference level low)” can be set.
  • the CA control unit 11 is configured to control the CA communication of the mobile station UE under the radio base station eNB # 1.
  • the CA control unit 11 serves as the serving cell P cell / S cell in the PCC or SCC included in the plurality of CCs based on the interference level notified by the neighboring radio base station eNB (for example, the radio base station eNB # 2). May be configured to determine.
  • the CA control unit 11 may be configured not to set a CC having a high interference level as the serving cell P cell / S cell in the surrounding radio base station eNB (for example, the radio base station eNB # 2).
  • the CA control unit 11 performs handover from the cell # 1 under the radio base station eNB # 1 of the mobile station UE to the cell under the radio base station eNB (for example, the cell # 2 under the radio base station eNB # 2).
  • the CC having a high interference level may not be selected as the serving cell P cell .
  • the CA control unit 11 refers to the “Load Information” shown in FIG. 3 and sets the information element “UL Interference Overload Indication (entire system bandwidth)” and the information element “UL High Interference indication (system High)”.
  • the uplink interference level in the CC specified by the information element “Cell ID (E-CGI)” may be determined based on at least one of the set values.
  • the CA control unit 11 refers to the “Load Information” shown in FIG. 3 and sets the setting value of the information element “DL Interference Overload Indication (entire system bandwidth)” and the information element “DL High Interference indication (system whole)”.
  • the downlink interference level in the CC identified by the information element “Cell ID (E-CGI)” may be determined based on at least one of the setting values of “”.
  • the CA control unit 11 refers to “Load Information” shown in FIG. 4 and is based on at least one of the setting value of the information element “UL Interference Overload Indication” and the setting value of the information element “UL High Interference Indication”.
  • the uplink interference level in the CC specified by the information element “Cell ID (E-CGI)” may be determined.
  • the CA control unit 11 has the same CC unit interference when all the “codepoints (high interference, medium interference, low interference)” of the PRB set in the information element “UL Interference Overload Indication” are the same. It may be configured to determine that such a value is set as the level (that is, the interference level of the entire system bandwidth).
  • the CA control unit 11 It may be configured to determine that such a value is set as the unit interference level (that is, the interference level of the entire system bandwidth).
  • the CA control unit 11 refers to “Load Information” shown in FIG. 4 and is based on at least one of the setting value of the information element “DL Interference Overload Indication” and the setting value of the information element “DL High Interference Indication”.
  • the downlink interference level in the CC specified by the information element “Cell ID (E-CGI)” may be determined.
  • the mobile communication system it is possible to exchange the interference level in units of CC for each downlink and uplink between adjacent radio base stations eNB using “Load Information”.
  • a first feature of the present embodiment is a mobile communication method in which the mobile station UE performs CA communication using a plurality of CCs (carriers) under the control of the radio base stations eNB # 1 / eNB # 2, and the radio base station eNB # 1 / eNB # 2 has a step of notifying a neighboring radio base station eNB # 2 / eNB # 1 of an interference level for each CC included in a plurality of CCs for each downlink and uplink. Is the gist.
  • wireless base station eNB # 1 / eNB # 2 serves as a serving cell in PCC (main carrier) or SCC (subcarrier) contained in several CC You may further have the process of determining Pcell / Scell .
  • a second feature of the present embodiment is a mobile communication system configured such that the mobile station UE can perform CA communication using a plurality of CCs under the control of the radio base stations eNB # 1 / eNB # 2.
  • the gist of the present invention is to provide a transmitter 12 configured to notify
  • the CA control unit 13 configured to determine the serving cell P cell / S cell in the PCC or SCC included in the plurality of CCs based on the notified interference level is further provided. You may have.
  • radio base stations eNB # 1 / eNB # 2 and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or 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 radio base station eNB or the mobile station UE. Further, the storage medium and the processor may be provided in the radio base station eNB # 1 / eNB # 2 or the mobile station UE as a discrete component.
  • eNB # 1, eNB # 2 radio base station 11 ... transmitting unit 12 ... receiving unit 13 ... CA control unit UE ... mobile station

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

Abstract

Afin de permettre à des stations de base sans fil (eNB) adjacentes d'échanger des informations concernant le niveau de brouillage dans chaque porteuse composante, le procédé de communication mobile selon la présente invention comprend une étape dans laquelle chacune des stations de base sans fil (eNB#1, eNB#2) notifie à la station de base sans fil adjacente (eNB#2, eNB#1) le niveau de brouillage dans chacune des porteuses composantes séparément pour la liaison descendante et la liaison montante.
PCT/JP2012/063922 2011-05-31 2012-05-30 Procédé de communication mobile et station de base sans fil Ceased WO2012165475A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011122196A JP2012253407A (ja) 2011-05-31 2011-05-31 移動通信方法及び無線基地局
JP2011-122196 2011-05-31

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WO2012165475A1 true WO2012165475A1 (fr) 2012-12-06

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GB2499222A (en) * 2012-02-08 2013-08-14 Nec Corp Generating a measurement report comprising information calculated from a power ratio of a non-zero power almost blank sub-frame

Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2011052643A1 (fr) * 2009-10-29 2011-05-05 日本電気株式会社 Système de communications sans fil, procédé de communications sans fil, station de communications sans fil, et programme

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011052643A1 (fr) * 2009-10-29 2011-05-05 日本電気株式会社 Système de communications sans fil, procédé de communications sans fil, station de communications sans fil, et programme

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NOKIA SIEMENS NETWORKS ET AL.: "Primary Component Carrier Selection, Monitoring, and Recovery", 3GPP TSG RAN WG1 #57 MEETING R1-091779, 4 May 2009 (2009-05-04), Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/wg1_r11/TSGR1_57/Docs/R1-091779.zip> [retrieved on 20120613] *

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