WO2010032847A1 - 移動局、無線基地局及び移動通信方法 - Google Patents
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- WO2010032847A1 WO2010032847A1 PCT/JP2009/066433 JP2009066433W WO2010032847A1 WO 2010032847 A1 WO2010032847 A1 WO 2010032847A1 JP 2009066433 W JP2009066433 W JP 2009066433W WO 2010032847 A1 WO2010032847 A1 WO 2010032847A1
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- 238000010295 mobile communication Methods 0.000 title claims description 29
- 238000000034 method Methods 0.000 title description 8
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000008054 signal transmission Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 abstract description 20
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 1
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/20—Performing reselection for specific purposes for optimising the interference level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- 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
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- 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
Definitions
- the present invention relates to a mobile station, a radio base station, and a mobile communication method.
- 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 station, a radio base station, and a mobile communication method.
- a first feature of the present invention is a mobile communication system configured such that the same frequency is repeatedly used in a plurality of cells, and the mobile station establishes a radio link between two or more cells.
- a reception quality measuring unit configured to measure the reception quality of each pilot signal of the two or more cells, and the first of the two or more cells having the best reception quality.
- a channel quality information transmission unit configured to transmit channel quality information corresponding to the reception quality to a cell, and a cell other than the first cell among the two or more cells.
- a radio base station for managing a cell other than the first cell comprising: a control signal transmission unit configured to transmit a control signal requesting not to transmit a data signal using the same resource as the first cell; Is going down A scheduling unit configured to perform scheduling in a link, and a scheduling unit of a radio base station that manages cells other than the first cell receives the control signal from the mobile station.
- the gist of the invention is that scheduling is performed so that a data signal is not transmitted in a cell other than one cell using the same resource as that of the first cell.
- each of a plurality of radio base stations included in the mobile communication system may be configured to determine a frequency to be used in a subordinate cell in an autonomous and distributed manner.
- a second feature of the present invention is a mobile station configured to measure reception quality of pilot signals of each of the plurality of cells when a radio link is established with the plurality of cells.
- Channel quality information configured to transmit channel quality information corresponding to the reception quality to the first cell having the best reception quality among the plurality of cells.
- the transmitting unit is configured to transmit a control signal requesting not to transmit a data signal with the same resource as the first cell to a cell other than the first cell among the plurality of cells. And a control signal transmission unit.
- a radio base station including a scheduling unit configured to perform scheduling in downlink, wherein the scheduling unit includes a plurality of second cells under the radio base station.
- the scheduling unit includes a plurality of second cells under the radio base station.
- the scheduling unit is configured to preferentially allocate resources in the downlink to mobile stations that have established radio links with the plurality of cells. May be.
- a mobile communication method wherein when a mobile station establishes a radio link with a plurality of cells, the reception quality of each pilot signal of the plurality of cells is increased. Measuring, the mobile station transmitting channel quality information corresponding to the reception quality to the first cell having the best reception quality among the plurality of cells, and the mobile station, A step of transmitting a control signal requesting not to transmit a data signal with the same resource as the first cell to cells other than the first cell among the plurality of cells; When a radio base station that manages a cell receives the control signal from the mobile station, scheduling is performed so that a data signal is not transmitted using the same resource as the first cell in a cell other than the first cell. Process to perform The gist of the Rukoto.
- a mobile station As described above, according to the present invention, a mobile station, a radio base station, and a mobile station that can reduce inter-cell interference in a mobile communication system configured to repeatedly use the same frequency in a plurality of cells.
- a mobile communication method 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 Ratio), 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 CQI transmission unit 16 corresponds to the reception quality of the first cell having the best reception quality measured by the reception quality measurement unit 15 among the plurality of cells in which the radio link is set by the mobile station UE. It is configured to transmit CQI (Channel Quality Information: Channel Quality Indicator).
- the control signal transmission unit 17 performs the first control on the cells other than the first cell having the best reception quality measured by the reception quality measurement unit 15 among the plurality of cells in which the radio link is set by the mobile station UE. It is configured to transmit a control signal requesting not to transmit a data signal with the same resource (for example, resource block) as one cell.
- the CQI transmission unit 16 transmits a CQI corresponding to the reception quality to the first cell with better reception quality.
- the control signal transmission part 17 is comprised so that the above-mentioned control signal may be transmitted with respect to the 2nd cell with a bad reception quality.
- control signal transmission unit 17 may be configured to transmit the above-described control signal only when the reception quality in a cell other than the first cell is lower than 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 the above-described control signal from the mobile station UE in which a radio link is set with a cell under the radio base station eNB.
- 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 receives the above-described control signal from the mobile station UE that has set up a radio link with a plurality of cells including the second cell under the radio base station eNB.
- the scheduling unit 26 is configured to perform scheduling so that the second cell does not transmit a data signal using the same resource as the first cell included in the number of cells.
- the control signal is transmitted from the mobile station UE that has set a radio link between the cell # 1 under the radio base station eNB # 1 and the cell # 2 under the radio base station eNB # 1.
- the reception unit 24 receives a control signal requesting not to transmit a data signal in the same resource block # 1 as the cell # 1 in the cell # 2, and the CQI reception unit 25 receives the CQI related to the cell # 1
- the scheduling unit 26 transmits a data signal to the cell # 1 in the resource block # 1 and stops transmitting the data signal to the cell # 2.
- 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 first cell receives a handover instruction signal from the radio base station eNB that manages the first cell in step S101. The operation proceeds to step S102.
- step S102 the mobile station UE starts handover by setting a radio link between the first cell and the second cell in response to the handover instruction signal.
- step S103 the mobile station UE measures the reception quality of pilot signals in the first cell and the second cell.
- the reception quality of the pilot signal in the second cell is better than the reception quality of the pilot signal in the first cell.
- step S104 the mobile station UE transmits a CQI corresponding to the reception quality of the second cell to the second cell, and does not transmit a data signal to the first cell using the same resource as the second cell.
- a control signal to request is transmitted.
- step S105 the mobile station UE receives the data signal transmitted by the second cell. In such a case, it is assumed that no data signal is transmitted from the first cell.
- the mobile station UE when the mobile station UE has set up radio links with a plurality of cells, the data signal of the cell with poor reception quality of the pilot signal in the mobile station UE is received. Since transmission can be stopped, inter-cell interference in a mobile communication system configured to repeatedly use the same frequency in a plurality of cells can be reduced.
- the mobile station UE while preferentially assigning the downlink to the mobile station UE existing at the cell edge, that is, the mobile station UE in the soft handover state. Since it is possible to stop transmission of data signals by a cell having poor pilot signal reception quality, it is possible to increase downlink throughput.
- 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.
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におけるパイロット信号の受信品質の悪いセルによるデータ信号の送信を停止することができるため、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 (6)
- 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であって、
移動局は、
2以上のセルとの間で無線リンクが設定されている際に、該2以上のセルの各々のパイロット信号の受信品質を測定するように構成されている受信品質測定部と、
前記2以上のセルのうち、前記受信品質が最も良い第1セルに対して、該受信品質に対応するチャネル品質情報を送信するように構成されているチャネル品質情報送信部と、
前記2以上のセルのうち、前記第1セル以外のセルに対して、該第1セルと同一のリソースでデータ信号を送信しないように要求する制御信号を送信するように構成されている制御信号送信部とを具備し、
前記第1セル以外のセルを管理する無線基地局は、
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し、
前記第1セル以外のセルを管理する無線基地局のスケジューリング部は、前記移動局から前記制御信号を受信した場合に、該第1セル以外のセルにおいて、前記第1セルと同一のリソースでデータ信号を送信しないようにスケジューリング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。 - 前記移動通信システムに含まれる複数の無線基地局の各々は、自立分散的に、配下のセルにおいて使用する周波数を決定するように構成されている請求項1に記載の移動通信システム。
- 複数のセルとの間で無線リンクが設定されている際に、該複数のセルの各々のパイロット信号の受信品質を測定するように構成されている受信品質測定部と、
前記複数のセルのうち、前記受信品質が最も良い第1セルに対して、該受信品質に対応するチャネル品質情報を送信するように構成されているチャネル品質情報送信部と、
前記複数のセルのうち、前記第1セル以外のセルに対して、該第1セルと同一のリソースでデータ信号を送信しないように要求する制御信号を送信するように構成されている制御信号送信部とを具備することを特徴とする移動局。 - 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、前記無線基地局配下の第2セルを含む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、所定の制御信号を受信した場合に、該第2セルにおいて、該複数のセルに含まれる第1セルと同一のリソースでデータ信号を送信しないようにスケジューリング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。 - 前記スケジューリング部は、前記複数のセルとの間で無線リンクを設定している移動局に対して、前記下りリンクにおけるリソースを優先的に割り当てるように構成されていることを特徴とする請求項4に記載の無線基地局。
- 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、該複数のセルの各々のパイロット信号の受信品質を測定する工程と、
前記移動局が、前記複数のセルのうち、前記受信品質が最も良い第1セルに対して、該受信品質に対応するチャネル品質情報を送信する工程と、
前記移動局が、前記複数のセルのうち、前記第1セル以外のセルに対して、該第1セルと同一のリソースでデータ信号を送信しないように要求する制御信号を送信する工程と、
前記第1セル以外のセルを管理する無線基地局が、前記移動局から、前記制御信号を受信した場合に、該第1セル以外のセルにおいて、該第1セルと同一のリソースでデータ信号を送信しないようにスケジューリングを行う工程とを有することを特徴とする移動通信方法。
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EP09814691.3A EP2334116A4 (en) | 2008-09-22 | 2009-09-18 | MOBILE STATION, RADIO BASE STATION, AND MOBILE COMMUNICATION METHOD |
CN200980137091.0A CN102160421B (zh) | 2008-09-22 | 2009-09-18 | 移动台、无线基站以及移动通信方法 |
US13/120,333 US8923878B2 (en) | 2008-09-22 | 2009-09-18 | Mobile station, radio base station, and mobile communication method |
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JP2008242648A JP5172562B2 (ja) | 2008-09-22 | 2008-09-22 | 移動局及び移動通信方法 |
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- 2009-09-18 EP EP09814691.3A patent/EP2334116A4/en not_active Withdrawn
- 2009-09-18 CN CN200980137091.0A patent/CN102160421B/zh not_active Expired - Fee Related
- 2009-09-18 US US13/120,333 patent/US8923878B2/en not_active Expired - Fee Related
- 2009-09-18 WO PCT/JP2009/066433 patent/WO2010032847A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
EP2334116A1 (en) | 2011-06-15 |
JP5172562B2 (ja) | 2013-03-27 |
US8923878B2 (en) | 2014-12-30 |
KR20110063645A (ko) | 2011-06-13 |
CN102160421A (zh) | 2011-08-17 |
JP2010074738A (ja) | 2010-04-02 |
EP2334116A4 (en) | 2016-06-08 |
US20110217983A1 (en) | 2011-09-08 |
CN102160421B (zh) | 2015-11-25 |
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