WO2009091208A2 - Procédé d'atténuation d'interférence intercellulaire - Google Patents

Procédé d'atténuation d'interférence intercellulaire Download PDF

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Publication number
WO2009091208A2
WO2009091208A2 PCT/KR2009/000240 KR2009000240W WO2009091208A2 WO 2009091208 A2 WO2009091208 A2 WO 2009091208A2 KR 2009000240 W KR2009000240 W KR 2009000240W WO 2009091208 A2 WO2009091208 A2 WO 2009091208A2
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WO
WIPO (PCT)
Prior art keywords
base station
data
group
terminal
groups
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Application number
PCT/KR2009/000240
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English (en)
Korean (ko)
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WO2009091208A9 (fr
WO2009091208A3 (fr
Inventor
Choong Il Yeh
Young Seog Song
Seung Joon Lee
Byung-Jae Kwak
Ji Hyung Kim
Dong Seung Kwon
Original Assignee
Electronics And Telecommunications Research Institute
Samsung Electronics Co., Ltd.
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
Priority claimed from KR1020090003509A external-priority patent/KR101207570B1/ko
Application filed by Electronics And Telecommunications Research Institute, Samsung Electronics Co., Ltd. filed Critical Electronics And Telecommunications Research Institute
Priority to US12/811,785 priority Critical patent/US8805283B2/en
Publication of WO2009091208A2 publication Critical patent/WO2009091208A2/fr
Publication of WO2009091208A3 publication Critical patent/WO2009091208A3/fr
Publication of WO2009091208A9 publication Critical patent/WO2009091208A9/fr

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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 an intercell interference mitigation method.
  • a frequency reuse factor may be defined as (k / N).
  • the interference mitigation algorithm between cells is changing from a scheme implemented at the receiver side to a fractional frequency reuse (FFR) scheme or a network multi-input multi-output (MIMO) scheme implemented at the transmitter side.
  • FFR fractional frequency reuse
  • MIMO network multi-input multi-output
  • the FFR method increases the spectrum usage efficiency by obtaining a large FRF value, and can be divided into two methods, a hard FFR and a soft FFR.
  • the hard FFR scheme does not allow neighboring cells to use the same frequency in the cell boundary region to mitigate inter-cell interference at the network level.
  • adjacent cells do not allocate the same subcarriers to terminals located in a cell boundary area in cooperation.
  • the soft FFR scheme permits the use of specific subcarriers.
  • the soft FFR scheme modulates the transmission power of specific subcarriers to mitigate interference by cooperation of adjacent cells to mitigate interference between cells at the network level.
  • antennas included in base stations of neighboring cells cooperatively transmit and receive MIMO to each other to improve interference mitigation or system performance.
  • a method for mitigating intercell interference at a base station includes grouping a plurality of terminals into a plurality of groups, transmitting first data to a first terminal belonging to a first group of the plurality of groups without cooperation with a neighboring base station, and collaborating with a neighboring base station And transmitting second data to a second terminal belonging to a second group among the plurality of groups through the second data.
  • a method for mitigating intercell interference in a terminal includes transmitting feedback information to a serving base station, when belonging to the first group by the feedback information, receiving first data from the serving base station without cooperation of an adjacent base station, and by the feedback information. If belonging to two groups, receiving second data in cooperation with the serving base station and the neighboring base station.
  • a method for mitigating intercell interference at a base station includes grouping a plurality of terminals into a plurality of groups, not applying a network MIMO scheme to a terminal belonging to a first group among the plurality of groups, and to a terminal belonging to a second group among the plurality of groups. And applying a MIMO scheme through cooperation with a neighbor base station.
  • inter-cell interference at a cell boundary may be mitigated by transmitting data through cooperation between base stations or data without cooperation between base stations according to the location and SINR of the terminal.
  • performance may be improved at a cell boundary by appropriately using a network MIMO scheme, an FFR scheme, etc. according to the position of the terminal.
  • FIG. 1 is a schematic diagram of a cellular system according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of an inter-cell interference mitigation method according to an embodiment of the present invention.
  • 3 to 5 are diagrams illustrating a transmission method in radio resource allocation areas 1, 2, and 3 according to an embodiment of the present invention, respectively.
  • FIG. 6 is a diagram illustrating a transmission method using a network MIMO scheme.
  • FIG. 7 is a diagram illustrating a transmission method using the STC method.
  • FIGS. 8 and 9 are diagrams illustrating a resource scheduling method according to an embodiment of the present invention.
  • FIGS. 10 and 11 are diagrams illustrating a resource scheduling method according to another embodiment of the present invention.
  • a terminal may include a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user device (user). equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.
  • a base station may include an access point (AP), a radio access station (RAS), a node B (node B), an advanced node B (evolved node B, eNodeB), and a transmission / reception base station (BS).
  • AP access point
  • RAS radio access station
  • node B node B
  • eNodeB advanced node B
  • BS transmission / reception base station
  • BTS base transceiver station
  • BSR mobile multihop relay base station
  • BSR mobile multihop relay
  • FIG. 1 is a schematic diagram of a cellular system according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for intercell interference mitigation according to an embodiment of the present invention.
  • the terminal 110 measures information to be fed back to the base station 120 and transmits the measured feedback information to the base station 120.
  • Such feedback information includes signal to interference plus noise ratio (SINR) and information of a preferred beam, and may further include information of an interference cell.
  • the interfering cell refers to a cell which interferes with the serving cell of the terminal 110 and is recognizable by the terminal 110, and information of the interfering cell is an index of the interfering cell and / or an interfering beam of the interfering cell. It may include an indes.
  • the preferred beam means a base station of the serving cell, that is, a beam most preferred by the terminal 110 among a plurality of beams that the serving base station 120 may transmit.
  • the base station 120 receives the feedback information from the terminal 110, cooperates with a neighboring base station (for example, 121-124) to determine a transmission method, and transmits data to the terminal 110 accordingly.
  • a neighboring base station for example, 121-124
  • the base station 120 may transmit an amble (hereinafter, referred to as "amble 1") capable of cell division so that the terminal 110 may measure an SINR and an interference cell.
  • the base station 120 may transmit another amble (hereinafter, referred to as "amble 2") so that the terminal 110 estimates a channel for each transmit antenna.
  • the base station 120 may transmit the amble 1 and the amble 2 using a large power so that the amble 1 and the amble 2 may also be received by the terminal of the neighbor cell.
  • the terminal 110 estimates a channel for each transmit antenna using the amble 2 received from the base station 120.
  • the channel estimation result h of each transmission antenna measured by the terminal 110 may be represented by a complex matrix of 1 ⁇ M ( h ⁇ C 1 ⁇ M , where C is a complex number), where M is the transmission of the base station 120. Number of antennas].
  • the terminal 110 calculates the direction of the channel by using the channel estimation result h as shown in Equation 1, and uses the direction of the channel and the codebook c n shared with the base station 120. Is determined.
  • L beam indices are represented by ⁇ 0,1,2,... , L-1 ⁇ , the preferred beam index m can be expressed as Equation 2.
  • the serving base station 120 and the neighboring base stations 121-124 transmit the amble 1 and the amble 2 (S210 and S220).
  • the base stations 120-124 may combine the amble 1 and the amble 2 and transmit the amble 1 into one amble.
  • the terminal 110 receives the amble 1 and the amble 2 from the serving base station 120 and the base stations 121-124 of the adjacent cell, respectively.
  • the terminal 110 measures SINR and neighbor cell information by using amble 1 and measures a preferred beam among transmission beams of the serving base station 120 by using amble 2 (S230). Report to the serving base station 120 (S240).
  • the terminal 110 may report to the serving base station 120 the beam index of the beam serving as the largest interference among the beams transmitted by the neighboring cell (interfering cell) together with the cell index of the corresponding interfering cell.
  • the base stations 120-124 share the feedback information reported by the terminal of the cell through cooperation (S250), and through this process, each base station 120-124 of the cellular system receives the position of each terminal and the received SINR for each terminal. Confirm the information, such as (S260). In this case, the base station may share feedback information through backhaul communication.
  • the base station 120-124 groups the plurality of terminals into a plurality of groups based on such information (S270), classifies radio resources into resources corresponding to the plurality of groups, allocates the resources corresponding to each group, and groups each group.
  • a transmission method corresponding to the control unit 20 is determined.
  • the base station 120 transmits data in a transmission scheme corresponding to the corresponding group by using the resources allocated to the group to which the terminal 110 belongs (S290).
  • the adjacent base stations 121-124 may transmit data to the terminal 110 in cooperation with the base station 120 (S291).
  • the SINR of the terminal 110 is high from the feedback information received by the base station 120 from the terminal 110, there is no interference cell for the terminal 110, and the preferred beam index of the terminal 110 is If it is determined that the number 6, the base station 120 may determine that the terminal 110 is located close to the base station 120 in the beam area 6 of the base station 120, as shown in FIG.
  • the SINR of the terminal 111 is low from the feedback information received by the base station 120 from the terminal 111, and the index of the interference cell with respect to the terminal 111 is 3 (index of the cell corresponding to the base station 122).
  • the base station 120 may determine that the terminal 111 is located close to cell 3 in the beam area 3 of the base station 120 as shown in FIG. 1.
  • radio resource allocation regions 1, 2, and 3 are called radio resource allocation regions 1, 2, and 3, respectively.
  • FIG. 3 is a diagram illustrating a transmission method in a radio resource allocation area 1 according to an embodiment of the present invention.
  • the base stations 321-323 allocate the radio resource allocation area 1 to the terminals 311a-313c which are weakly subjected to interference from neighbor cells and have a high reception SINR. These terminals 311a-313c may be located at the center of each cell.
  • the base stations 321-323 of each cell transmit data using only their own antennas without cooperating with the base station of the neighboring cell (that is, without using the antenna of the base station of the neighboring cell).
  • the base stations 321-323 may not use the FFR scheme. Accordingly, the base stations 321-323 of each cell can recycle the spectrum used by adjacent cells, and also multi-user MIMO (MU-MIMO) scheme or spatial multiplexing (SM).
  • MU-MIMO multi-user MIMO
  • SM spatial multiplexing
  • the FRF has a value greater than one.
  • the MU-MIMO method based on channel status information at transmitter side (CSIT) based on the MU-MIMO method, the MU-MIMO method based on linear or nonlinear full CSIT, etc. Can be applied.
  • An example of a partial CSIT-based MU-MIMO scheme is a codebook based MU-MIMO scheme.
  • the base stations 321-323 of three adjacent cells all use the same spectrum, and these base stations 321-323 each have a preferred beam index in an MU-MIMO scheme.
  • Data is transmitted to a plurality of terminals 311a-311c, 312a-312c, and 313a-313c which are different from each other.
  • the FRF is 3.
  • FIG. 4 is a diagram illustrating a transmission method in a radio resource allocation area 2 according to an embodiment of the present invention.
  • the base stations 421-423 allocate radio resource allocation area 2 to terminals 411-413 that have strong interference from adjacent cells, have low reception SINR, and are separated from each other. These terminals 411-413 may be located in the cell boundary region and are far enough apart that the inter-beam interference can be ignored. In this case, the base stations 421-423 may not apply the MU-MIMO scheme or the SM scheme that requires high SINR.
  • the terminals 411-413 having strong interference cells report the feedback information including the preferred beam index to the serving base stations 421-423, and the base station 421-423 cooperates with the feedback information.
  • each base station 421-423 can know the location of the terminal 411-413 of the neighbor cell using the promised beam position. Accordingly, each base station 421-423 may indirectly recognize its own beam index acting as an interference to the terminals 411-413 of the neighbor cell.
  • each base station 421-423 when the terminals 411-413 report the interference beam index of the neighboring cell together with the preferred beam index of the serving cell to the base stations 421-423, each base station 421-423 has cooperation with the base stations. Through this, it is possible to directly recognize its beam index acting as an interference to the terminals 411-413 of the neighbor cell.
  • the base stations 421-423 may coordinate with each other so that beams of adjacent cells using the same frequency do not collide with each other, thereby mitigating interference in the cell boundary region.
  • the base stations 421-423 may provide macro diversity to the terminals 411-413 using the network MIMO.
  • Such a network MIMO is a collaborative MIMO or cooperative MIMO (Co-MIMO).
  • Co-MIMO cooperative MIMO
  • the terminal reception performance is improved, but since the data payload is simultaneously transmitted to the serving base station and the neighbor base station in the network, the backhaul overhead may be increased. Therefore, whether to use network MIMO may be selected according to the environment.
  • the base stations 421 and 423 simultaneously transmit data payload 1 to the terminal 411, and the base stations 422 and 423 simultaneously transmit data payload 2 to the terminal 412.
  • the base stations 422 and 421 simultaneously transmit the data payload 3 to the terminal 413 so that the beams do not collide with each other using the same spectrum.
  • the two base stations use network MIMO.
  • one of the two base stations 421, 423 receives the data payload 1 at the terminal 411
  • one of the two base stations 422, 423 receives the data payload 2 at the terminal 412
  • the two base stations may deliver the data payload 3 to the terminal 413 using beamforming.
  • the base station may not use network MIMO.
  • the two base stations 421 and 423 may simultaneously transmit the data payload 1 to the terminal 411 using the same spectrum using a space time code (STC) method with beamforming applied thereto.
  • STC space time code
  • FIG. 5 is a diagram illustrating a transmission method in a radio resource allocation area 3 according to an embodiment of the present invention.
  • the base stations 521-523 allocate a radio resource allocation area 3 to terminals 511-513 that have strong interference from neighboring cells, have low reception SINR, and are bundled together.
  • the terminals 511-513 may be clustered in a cell boundary region.
  • the base stations 521-523 may simultaneously apply the network MIMO scheme and the FFR scheme to alleviate inter-cell interference, or may not apply the network MIMO scheme.
  • the base stations 521-523 use beams of the same frequency to one terminal 511 belonging to one group, respectively.
  • the same data payload can be transmitted (network MIMO method).
  • the base stations 521-523 do not use the spectrum (frequency) used for the terminal 511 for the other terminals 512 and 513 belonging to this group (FFR method).
  • the terminal 511 may obtain macro diversity by a network MIMO scheme.
  • the base station 521 provides a data payload to the terminal 511 using a beam, and the base stations 522 and 523 are each a terminal 611.
  • the data payload may be provided to the terminals 512 and 513 by using a resource different from that used in the (FFR method).
  • the base station receives feedback information from the terminal, groups the terminal into a plurality of groups according to the location through cooperation between the base stations, and uses a resource and a transmission scheme corresponding to each group. Since data is transmitted, inter-cell interference can be mitigated.
  • FIG. 6 is a diagram illustrating a transmission method using a network MIMO method
  • FIG. 7 is a diagram showing a transmission method using an STC method.
  • each base station 610 and 620 includes a plurality of antennas (for example, four antennas) 611-614 and 621-624.
  • the base station 610 is a serving base station of the terminal 630, and the two base stations 610 and 620 are classified into a group corresponding to the radio resource allocation area 2 based on the feedback information of the terminal 630.
  • the first beam of the base station 610 is the preferred beam of the terminal 630 and the fifth beam of the base station 620 is a beam that acts as a strong interference to the terminal 630.
  • the two base stations 610 and 620 according to the network MIMO scheme is the same data (S i, S i + 1) is transmitted by using a plurality of antennas (611-614, 621-624).
  • the base station 610 is a beam forming weight ([w bs1, a1, b1 w bs1, a2, b1 w bs1, a3, b1 w bs1, a4, ) of the first beam in the data (S i , S i + 1 ) b1 ] T ) and transmits them to the terminal 630 through the corresponding antennas 611-614.
  • the base station 620 is data (S i, S i + 1 ) 5 times beamforming weights ([w bs2 of the beam in, a1, b5 w bs2, a2 , b5 w bs2, a3, b5 w bs2, a4, b5 ] T ) and multiply them to the terminal 630 through the corresponding antennas (621-624).
  • the two base stations 610 and 620 can transmit the same data to the terminal using the same frequency resource through cooperation, a macro diversity effect can be obtained.
  • two base stations 610 and 620 transmit space-time encoded data using a plurality of antennas 611-614 and 621-624 according to the STC scheme to which beamforming is applied.
  • the base station 710 has data (S i, i + 1 -S *) 1 times the beam beamforming weights of the ([w bs1, a1, b1 w bs1, a2, b1 w bs1, a3, b1 w bs1, a4, b1 ] T ), and sequentially transmit them to the terminal 630 through the corresponding antennas 611-614.
  • the base station 620 transmits the beamforming weights of the fifth beam ([w bs2, a1, b5 w bs2, a2, b5 w bs2, a3, b5 w bs2, a4, ) to the data S * i and S i + 1 . b5 ] T ) and sequentially transmit them to the terminal 630 through the corresponding antennas 621-624.
  • the two base stations 610 and 620 may transmit the same data to the terminal 630 using the same frequency resource through cooperation, diversity effects according to space-time encoding may be obtained.
  • FIGS. 8 and 9 are diagrams illustrating a resource scheduling method according to an embodiment of the present invention
  • FIGS. 10 and 11 are diagrams illustrating a resource scheduling method according to another embodiment of the present invention.
  • one base station divides a radio resource into a plurality of groups, for example, three groups 811, 812, and 813 in time (that is, in a symbol index direction), and a plurality of groups. Radio resource allocation areas 1, 2, and 3 are allocated to 811, 812, and 813, respectively.
  • another base station also divides radio resources into a plurality of groups 821, 822, and 823 in time, and assigns a radio resource allocation area 1 to each of the plurality of groups 821, 822, and 823. Allocate 2 and 3.
  • the base station 1 divides a radio resource into a plurality of groups, for example, three groups 911, 912, and 913 in frequency (ie, in a subcarrier index direction), and the plurality of groups 911, Radio resource allocation areas 1, 2 and 3 are allocated to 912 and 913, respectively.
  • the base station 2 also divides radio resources into a plurality of groups 921, 922, and 923 in frequency, and allocates radio resource allocation regions 1, 2, and 3 to the plurality of groups 921, 922, and 923, respectively. Allocate
  • the radio resource allocation regions 1 and 2 may be used by the base stations 1 and 2 together, but the radio resource allocation region 3 to which the FFR scheme is applied is assigned to one base station (for example, base station 1) of the two base stations. Can only be used by the base stations 1 and 2 together, but the radio resource allocation region 3 to which the FFR scheme is applied is assigned to one base station (for example, base station 1) of the two base stations. Can only be used by the base stations 1 and 2 together, but the radio resource allocation region 3 to which the FFR scheme is applied is assigned to one base station (for example, base station 1) of the two base stations. Can only be used by the base station 1 and 2 together, but the radio resource allocation region 3 to which the FFR scheme is applied is assigned to one base station (for example, base station 1) of the two base stations. Can only be used by the base station 1 and 2 together, but the radio resource allocation region 3 to which the FFR scheme is applied is assigned to one base station (for example, base station 1) of the two base stations. Can only be used by the base station 1 and 2 together
  • the radio resources are distributed in time, and in FIG. 10 and FIG. 11, the radio resources are distributed in the frequency direction.
  • the radio resources may be two-dimensionally distributed in time and frequency.
  • the embodiments of the present invention described above are not only implemented through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Selon un procédé d'atténuation d'interférence intercellulaire, une pluralité de terminaux sont groupés dans une pluralité de groupes. Une station de base transmet des données à un premier terminal appartenant à un premier groupe choisi parmi la pluralité des groupes, sans l'aide d'une station de base voisine. En outre, la station de base transmet des données à un second terminal appartenant à un second groupe choisi parmi la pluralité des groupes, avec l'aide d'une station de base voisine.
PCT/KR2009/000240 2008-01-16 2009-01-16 Procédé d'atténuation d'interférence intercellulaire WO2009091208A2 (fr)

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Application Number Priority Date Filing Date Title
US12/811,785 US8805283B2 (en) 2008-01-16 2009-01-16 Inter-cell interference relief method

Applications Claiming Priority (4)

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KR10-2008-0004712 2008-01-16
KR20080004712 2008-01-16
KR10-2009-0003509 2009-01-15
KR1020090003509A KR101207570B1 (ko) 2008-01-16 2009-01-15 셀 간 간섭 완화 방법

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WO2009091208A2 true WO2009091208A2 (fr) 2009-07-23
WO2009091208A3 WO2009091208A3 (fr) 2010-11-25
WO2009091208A9 WO2009091208A9 (fr) 2011-01-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174701A1 (fr) * 2014-05-11 2015-11-19 엘지전자 주식회사 Procédé et dispositif de réception d'un signal dans un système d'accès sans fil prenant en charge une transmission fdr
US10123338B2 (en) 2014-03-26 2018-11-06 Lg Electronics Inc. Method and apparatus for allocating resources in wireless access system supporting FDR transmission

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US20070040704A1 (en) * 2005-08-22 2007-02-22 Smee John E Reverse link interference cancellation
EP1804395A1 (fr) * 2005-12-29 2007-07-04 Alcatel Lucent Procédé et dispositif de neutralisation des interférences dans un système de communication sans fil

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US20070040704A1 (en) * 2005-08-22 2007-02-22 Smee John E Reverse link interference cancellation
EP1804395A1 (fr) * 2005-12-29 2007-07-04 Alcatel Lucent Procédé et dispositif de neutralisation des interférences dans un système de communication sans fil

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10123338B2 (en) 2014-03-26 2018-11-06 Lg Electronics Inc. Method and apparatus for allocating resources in wireless access system supporting FDR transmission
WO2015174701A1 (fr) * 2014-05-11 2015-11-19 엘지전자 주식회사 Procédé et dispositif de réception d'un signal dans un système d'accès sans fil prenant en charge une transmission fdr

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WO2009091208A3 (fr) 2010-11-25

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