WO2010032848A1 - 移動通信方法、移動通信システム及び無線基地局 - Google Patents
移動通信方法、移動通信システム及び無線基地局 Download PDFInfo
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- WO2010032848A1 WO2010032848A1 PCT/JP2009/066434 JP2009066434W WO2010032848A1 WO 2010032848 A1 WO2010032848 A1 WO 2010032848A1 JP 2009066434 W JP2009066434 W JP 2009066434W WO 2010032848 A1 WO2010032848 A1 WO 2010032848A1
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- cells
- cell
- mobile station
- mobile communication
- base station
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- 238000010295 mobile communication Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title abstract description 8
- 238000005259 measurement Methods 0.000 claims description 22
- 230000005540 biological transmission Effects 0.000 description 6
- 230000008054 signal transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a mobile communication method, a mobile communication system, and a radio base station.
- the LTE (Long Term Evolution) mobile communication system which is being standardized by 3GPP, is configured such that the same frequency is repeatedly used in a plurality of cells.
- each radio base station eNB is configured to determine a frequency to be used in a subordinate cell in an autonomous and distributed manner.
- An object is to provide a communication method, a mobile communication system, and a radio base station.
- a first feature of the present invention is a mobile communication method based on the reception quality of pilot signals in a plurality of cells when a mobile station has a radio link established between the cells. Determining a first cell having the largest amount of interference among the plurality of cells, transmitting the identification information of the first cell to the plurality of cells, and the plurality of the plurality of cells.
- the wireless base station that manages each of the cells includes a step of scheduling to transmit a data signal addressed to the mobile station using resources that cannot be used in the first cell.
- a second feature of the present invention is a mobile communication system comprising a mobile station capable of setting up a radio link with a plurality of cells, and a radio base station that manages each of the plurality of cells.
- the mobile station has the largest amount of interference among the plurality of cells based on the reception quality of pilot signals in the plurality of cells when radio links are set up with the plurality of cells.
- a reception quality measurement unit configured to determine one cell; and a transmission unit configured to transmit identification information of the first cell to the plurality of cells.
- the gist of the present invention is that the base station includes a scheduling unit configured to perform scheduling so as to transmit a data signal addressed to the mobile station using resources that cannot be used in the first cell.
- a third feature of the present invention is a radio base station comprising a scheduling unit configured to perform scheduling in downlink, wherein the scheduling unit sets radio links with a plurality of cells.
- the scheduling unit sets radio links with a plurality of cells.
- a mobile communication method and a mobile communication system capable of reducing inter-cell interference in a mobile communication system configured to repeatedly use the same frequency in a plurality of cells.
- a radio base station can be provided.
- 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 mobile station according to the first embodiment of the present invention.
- FIG. 3 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
- FIG. 4 is a diagram for explaining a data signal transmission method by the radio base station according to the first embodiment of the present invention.
- FIG. 5 is a flowchart showing the operation of the mobile station according to the first embodiment of the present invention.
- the LTE scheme is applied, and a plurality of radio base stations eNB exchange control signals with each other via a backhaul line.
- the mobile communication by each mobile station UE (for example, mobile station UE # 1) is controlled in an autonomous and distributed manner.
- the present invention is applicable not only to a mobile communication system to which the LTE scheme is applied, but also to a mobile communication system to which a communication scheme other than the LTE scheme is applied.
- the mobile station UE # 1 (hereinafter referred to as UE) according to this embodiment includes a pilot signal receiving unit 11, a measurement report transmitting unit 12, a handover instruction signal receiving unit 13, and a handover processing unit 14.
- the pilot signal receiving unit 11 receives a pilot signal (RS: Reference Signal) transmitted by one or more cells in which a radio link (specifically, an RRC connection) is set by the mobile station UE. It is configured.
- RS Reference Signal
- the pilot signal receiving unit 11 is configured to receive a pilot signal of a measurement target (Measurement Object) cell specified by a radio access network device (specifically, a radio base station eNB).
- a radio access network device specifically, a radio base station eNB.
- the measurement report transmission unit 12 measures the reception quality measured by the pilot signal reception unit 11 based on the report condition (Reporting Criteria) specified by the radio access network device (specifically, the radio base station eNB). And it is comprised so that the measurement report (Measurement Report) for notifying this measurement result may be transmitted.
- the radio access network device specifically, the radio base station eNB.
- reception quality measured by the measurement report transmission unit 12 RSRQ (Reference Signal Received Quality), RSRP (Reference Signal Received Power), reception SIR (Signal to Interference Assumption) and the like are assumed.
- the handover instruction signal receiving unit 13 is configured to receive a handover instruction signal for instructing to start handover from a radio access network apparatus (specifically, a radio base station eNB).
- a radio access network apparatus specifically, a radio base station eNB.
- the handover processing unit 14 is configured to perform a handover process based on the handover instruction signal received by the handover instruction signal receiving unit 13.
- the reception quality measurement unit 15 is transmitted by each of the plurality of cells when the mobile station UE has radio links established between the cells, that is, when the mobile station UE is in the soft handover state.
- the reception quality of the pilot signal is measured.
- reception quality measured by the reception quality measurement unit 15 is assumed to be RSRQ, RSRP, reception SIR, and the like, similarly to the reception quality measured by the measurement report transmission unit 12.
- the reception quality measuring unit 15 is configured to determine the first cell having the largest amount of interference from the plurality of cells based on the reception quality of the pilot signal.
- the CQI transmission unit 16 is configured to transmit CQI (channel quality information: Channel Quality Indicator) corresponding to the reception quality of the pilot signal measured by the reception quality measurement unit 15 to each of the plurality of cells described above. Has been.
- CQI channel quality information: Channel Quality Indicator
- the control signal transmission unit 17 is configured to transmit a control signal including the identification information of the first cell determined by the reception quality measurement unit 15 to each of the plurality of cells described above.
- control signal transmission unit 17 may be configured to transmit a control signal including identification information of the first cell only when the interference amount reception quality from the first cell exceeds a predetermined threshold.
- the radio base stations eNB # 1 / eNB # 2 include a measurement report receiving unit 21, a handover processing unit 22, a handover instruction signal transmitting unit 23, A control signal receiving unit 24, a CQI receiving unit 25, a scheduling unit 26, and a data signal transmitting unit 27 are provided.
- the measurement report receiving unit 21 is configured to receive a measurement report transmitted by a mobile station UE in which a radio link is set with a cell under the radio base station eNB.
- the handover processing unit 22 is configured to determine whether or not the mobile station UE described above should start handover based on the measurement report received by the measurement report receiving unit 21.
- the handover processing unit 22 may be configured to determine whether or not the above-described mobile station UE should start a handover according to a “cell edge identifier” received from another radio base station.
- the “cell edge identifier” is an identifier indicating that each mobile station UE exists at the cell edge, and is notified from each mobile station UE to a specific radio base station eNB. For example, when the difference in reception quality between pilot signals of two cells falls within a predetermined threshold, the mobile station UE determines that the mobile station UE is present at the cell edge, and sets a “cell edge identifier” indicating that to be present. You may notify with respect to the radio base station eNB which manages either of these two cells.
- the handover instruction signal transmission unit 23 is configured to transmit a handover instruction signal indicating that to the mobile station UE that has been determined by the handover processing unit 22 to start handover.
- the control signal receiving unit 24 is configured to receive a control signal including identification information of the first cell described above from the mobile station UE in which a radio link is set with a cell under the radio base station eNB. Yes.
- the CQI receiving unit 25 is configured to receive the above-described CQI from the mobile station UE in which a radio link is set with a cell under the radio base station eNB.
- the scheduling unit 26 is configured to perform scheduling in the downlink.
- control signal receiving unit 24 has received a control signal including the identification information of the first cell described above from the mobile station UE that has set up a radio link with a cell under the radio base station eNB.
- the scheduling unit 26 performs scheduling so that a data signal addressed to the mobile station UE is transmitted using resources that cannot be used in the first cell.
- the entire frequency band that can be used in the mobile communication system according to the present embodiment is divided into resources # 1 to # 3. Also, cell # 1 cannot use resource # 1, cell # 2 cannot use resource # 2, and cell # 3 cannot use resource # 3. To do.
- the control signal receiving unit 24 includes the identification information of the cell # 1 as the identification information of the first cell described above from the mobile station UE that has established a radio link with the cells # 1 to # 3.
- scheduling is performed such that the data signal addressed to the mobile station UE is transmitted by the resource # 1 that cannot be used in the cell # 1.
- control signal receiving unit 24 includes the identification information of the cell # 2 as the identification information of the first cell described above from the mobile station UE that has established the radio link with the cells # 1 to # 3.
- scheduling is performed such that a data signal addressed to the mobile station UE is transmitted using a resource # 2 that cannot be used in the cell # 2.
- control signal receiving unit 24 includes control information including identification information of the cell # 3 as the identification information of the first cell described above from the mobile station UE that has established a radio link with the cells # 1 to # 3.
- control information including identification information of the cell # 3 as the identification information of the first cell described above from the mobile station UE that has established a radio link with the cells # 1 to # 3.
- the scheduling described above may be configured to be performed in units of resource blocks including 7 OFDM symbols and 12 subcarriers.
- the scheduling unit 26 preferentially allocates resources in the downlink to the mobile station UE that has established radio links with a plurality of cells, that is, to the mobile station UE in the soft handover state. It may be configured as follows.
- the data signal transmission unit 27 is configured to transmit a data signal to the mobile station UE using the downlink resource allocated to the mobile station UE by the scheduling unit 26.
- step S101 when the mobile station UE that has established a radio link with the cell # 1 receives a handover instruction signal from the radio base station eNB that manages the cell # 1 in step S101. The operation proceeds to step S102.
- step S102 the mobile station UE starts handover by setting a radio link between the cell # 1 and the cell # 2 in response to the handover instruction signal.
- step S103 the mobile station UE measures the reception quality of pilot signals in the cell # 1 and the cell # 2.
- the mobile station UE detects that the interference amount in the cell # 1 is larger than the interference amount in the cell # 2 based on the measurement result.
- step S104 the mobile station UE transmits CQI corresponding to the reception quality of the cell # 1 and the cell # 2 to the cell # 1 and the cell # 2, and the identification information of the first cell having the largest amount of interference.
- a control signal including identification information of cell # 1.
- step S105 the mobile station UE receives the data signal transmitted from the cell # 2 using the resource # 1 that cannot be used by the cell # 1.
- the mobile station UE when the mobile station UE has established radio links with a plurality of cells, the cell that gives the most interference to the mobile station UE is the data signal. Scheduling is performed such that the same frequency is repeatedly used in a plurality of cells, so that it is possible to reduce inter-cell interference in a mobile communication system configured to repeatedly use the same frequency.
- the operations of the mobile station UE and the radio base station eNB described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .
- Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium 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. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE and the radio base station eNB. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE and the radio base station eNB.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
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の構成について説明する。
図5を参照して、本発明の第1の実施形態に係る移動通信システムの動作、具体的には、移動局UEの動作について説明する。
本実施形態に係る移動通信システムによれば、移動局UEが複数のセルとの間で無線リンクを設定している場合に、かかる移動局UEに対して最も多くの干渉を与えるセルがデータ信号を送信することができなくなるようにスケジューリングが行われるため、複数のセルにおいて同一の周波数が繰り返し使用されるように構成されている移動通信システムにおけるセル間干渉を低減することができる。
Claims (3)
- 移動局が、複数のセルとの間で無線リンクが設定されている際に、該複数のセルにおけるパイロット信号の受信品質に基づいて、該複数のセルの中から最も干渉量が多い第1セルを決定する工程と、
前記移動局が、前記複数のセルに対して、前記第1セルの識別情報を送信する工程と、
前記複数のセルの各々を管理する無線基地局が、前記第1セルにおいて使用できないリソースで前記移動局宛てのデータ信号を送信するようにスケジューリングする工程とを有することを特徴とする移動通信方法。 - 複数のセルとの間で無線リンクを設定することができる移動局と、該複数のセルの各々を管理する無線基地局とを具備する移動通信システムであって、
前記移動局は、
複数のセルとの間で無線リンクが設定されている際に、該複数のセルにおけるパイロット信号の受信品質に基づいて、該複数のセルの中から最も干渉量が多い第1セルを決定するように構成されている受信品質測定部と、
前記複数のセルに対して、前記第1セルの識別情報を送信するように構成されている送信部とを具備し、
前記無線基地局は、前記第1セルにおいて使用できないリソースで前記移動局宛てのデータ信号を送信するようにスケジューリングするように構成されているスケジューリング部を具備することを特徴とする移動通信システム。 - 下りリンクにおけるスケジューリングを行うように構成されているスケジューリング部を具備する無線基地局であって、
前記スケジューリング部は、複数のセルとの間で無線リンクを設定している移動局から、該複数のセルの中で最も干渉量が多いセルとして第1セルの識別情報を受信した場合に、前記第1セルにおいて使用できないリソースで前記移動局宛てのデータ信号を送信するようにスケジューリングするように構成されていることを特徴とする無線基地局。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09814692.1A EP2334135A4 (en) | 2008-09-22 | 2009-09-18 | MOBILE COMMUNICATION PROCESS, MOBILE COMMUNICATION SYSTEM AND RADIO BASE STATION |
US13/120,357 US20110218009A1 (en) | 2008-09-22 | 2009-09-18 | Mobile communication method, mobile communication system and radio base station |
CN200980137006.0A CN102160444B (zh) | 2008-09-22 | 2009-09-18 | 移动通信方法、移动通信系统以及无线基站 |
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JP2008-242652 | 2008-09-22 | ||
JP2008242652A JP5020209B2 (ja) | 2008-09-22 | 2008-09-22 | 移動通信方法、移動通信システム及び無線基地局 |
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WO2010032848A1 true WO2010032848A1 (ja) | 2010-03-25 |
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PCT/JP2009/066434 WO2010032848A1 (ja) | 2008-09-22 | 2009-09-18 | 移動通信方法、移動通信システム及び無線基地局 |
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US (1) | US20110218009A1 (ja) |
EP (1) | EP2334135A4 (ja) |
JP (1) | JP5020209B2 (ja) |
KR (1) | KR20110056524A (ja) |
CN (1) | CN102160444B (ja) |
WO (1) | WO2010032848A1 (ja) |
Cited By (1)
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JP5654128B2 (ja) * | 2011-07-13 | 2015-01-14 | 株式会社Nttドコモ | 異種ネットワークにおけるセル間干渉調整方法および異種ネットワーク |
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EP2709406B1 (en) * | 2011-05-10 | 2020-07-22 | Samsung Electronics Co., Ltd. | Method and apparatus for cell selection in a wireless communication system |
CN104184539B (zh) * | 2013-05-23 | 2018-10-19 | 中兴通讯股份有限公司 | 一种无线链路数据再纠错的方法及装置 |
CN111010707B (zh) * | 2013-06-13 | 2024-03-22 | 索尼公司 | 干扰协调方法、干扰协调装置以及测量装置 |
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Publication number | Publication date |
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JP2010074739A (ja) | 2010-04-02 |
JP5020209B2 (ja) | 2012-09-05 |
EP2334135A4 (en) | 2016-06-15 |
EP2334135A1 (en) | 2011-06-15 |
CN102160444A (zh) | 2011-08-17 |
US20110218009A1 (en) | 2011-09-08 |
KR20110056524A (ko) | 2011-05-30 |
CN102160444B (zh) | 2014-08-20 |
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