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WO2012088834A1 - Procédé et système de suppression de brouillage en liaison descendante - Google Patents

Procédé et système de suppression de brouillage en liaison descendante Download PDF

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Publication number
WO2012088834A1
WO2012088834A1 PCT/CN2011/075177 CN2011075177W WO2012088834A1 WO 2012088834 A1 WO2012088834 A1 WO 2012088834A1 CN 2011075177 W CN2011075177 W CN 2011075177W WO 2012088834 A1 WO2012088834 A1 WO 2012088834A1
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WIPO (PCT)
Prior art keywords
sector
sectors
data transmission
participating
joint data
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Ceased
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PCT/CN2011/075177
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English (en)
Chinese (zh)
Inventor
朱登魁
刘锟
鲁照华
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ZTE Corp
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ZTE Corp
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Publication of WO2012088834A1 publication Critical patent/WO2012088834A1/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
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies

Definitions

  • the present invention relates to the field of communications, and in particular, to a downlink interference suppression method and system.
  • Multi-antenna technology is a major breakthrough in smart antenna technology in the field of wireless mobile communications. This technology can multiply the capacity and spectrum utilization of communication systems without increasing bandwidth. It can also use multipath to mitigate multipath fading. It can effectively eliminate channel interference, improve channel reliability, and reduce bit error rate. It is a key technology used in next-generation mobile communication systems. It has been widely used in a variety of wireless broadband systems such as LTE (Long Term Evolution) and WiMAX (World Interoperability for Microwave Access).
  • LTE Long Term Evolution
  • WiMAX Worldwide Interoperability for Microwave Access
  • the present invention provides a downlink interference suppression method, including: when scheduling users in a plurality of sectors that belong to different cells and adjacent to each other, different sectors in the multiple sectors Cell edge users are scheduled to different resources;
  • the sector where the sector edge user is located and the neighboring sector transmit downlink data for the sector edge user in a joint data transmission manner.
  • the step of scheduling cell edge users of different sectors in the multiple sectors to different resources includes: Part or all of the resources of the downlink transmission frame shared by the plurality of sectors are divided into N sub-resource blocks in the frequency domain, and each sub-resource block corresponds to one of the plurality of sectors, where, N Greater than or equal to the number of the plurality of sectors;
  • the base station schedules the cell edge user in the sector to a sub-resource block corresponding to the sector.
  • the above methods also include:
  • the base station schedules the central area users in the sector to joint data transmission as follows:
  • the method of joint data transmission is as follows:
  • the transmit antenna of each sector participating in the joint data transmission transmits data W ⁇ on the same frequency
  • the present invention further provides a downlink interference suppression system, including:
  • a first subsystem configured to: when scheduling users in different sectors that belong to different cells and adjacent to each other, scheduling cell edge users of different sectors in the multiple sectors to different resources Up;
  • a second subsystem configured to: transmit, by the sector edge user in the cell, downlink data for the sector edge user by using a sector of the sector edge user and a neighboring sector in a joint data transmission manner .
  • the first subsystem includes:
  • a first device configured to: divide, in the frequency domain, part or all resources of the downlink transmission frame that are shared by the multiple cells that belong to different cells and are adjacent to each other into N sub-resource blocks, each sub-resource block Corresponding to one of the plurality of sectors, wherein N is greater than or equal to the number of the plurality of sectors;
  • a second device configured to: schedule, for each of the plurality of sectors belonging to different cells and adjacent to each other, a cell edge user in the sector to a sub-sector corresponding to the sector On the resource block.
  • the second device is further configured to: schedule, for each of the plurality of sectors belonging to different cells and adjacent to each other, the central area user in the sector to the N sub-resource blocks On the sub-resource block corresponding to other sectors.
  • the second subsystem includes a transmit antenna for each sector participating in the joint data transmission, and the transmit antenna of each sector participating in the joint data transmission is set to: transmit data on the same frequency
  • the second subsystem includes a transmit antenna of each sector participating in the joint data transmission, and the transmit antenna of each sector participating in the joint data transmission is configured to: transmit data W iS on the same frequency;
  • the second device is further configured to: use power at a cell edge for each of the plurality of sectors.
  • the invention mainly proposes a solution to the interference problem and the spectrum efficiency problem, and utilizes the resource division method, the scheduling method and the data transmission method of the invention to solve the same-frequency interference problem of the cell edge and the sector edge user, and improve the sector.
  • FIG. 1 is a schematic diagram of a neighboring cell model in a cellular network in the prior art
  • FIG. 2 is a flowchart of a downlink interference suppression method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of dividing a resource block in an application example 1 of the present invention.
  • FIG. 4 is a schematic diagram of dividing a resource block in an application example 2 of the present invention.
  • FIG. 5 is a schematic diagram of dividing a resource block in Application Example 3 of the present invention.
  • FIG. 6 is a schematic diagram of dividing a resource block in the application example 4 of the present invention. Preferred embodiment of the invention
  • the cell edge user described herein refers to the location of the cell edge region or The user whose signal-to-noise ratio is lower than the preset value;
  • the sector edge user refers to the user who is located in the set sector edge area but does not belong to the cell edge user;
  • the central area user refers to the user in the sector except the cell edge and Other users outside the sector edge user.
  • this embodiment provides a downlink interference suppression method, which includes the following steps:
  • Step 10 scheduling, when scheduling, users in different sectors that belong to different cells and adjacent to each other, scheduling cell edge users of different sectors in the multiple sectors to different resources;
  • Step 20 Serving the sector edge user in the cell edge user in the cell, the sector where the sector edge user is located, and the neighboring sector in a joint data transmission manner.
  • Step 10 may include the following steps in specific implementation:
  • Step 101 Part or all resources of a downlink transmission frame shared by multiple sectors that belong to different cells and adjacent to each other are divided into N sub-resource blocks in a frequency domain, where each sub-resource block corresponds to the multiple sectors. a sector in which N is greater than or equal to the number of the plurality of sectors;
  • Step 102 For each of the plurality of sectors that belong to different cells and are adjacent to each other, the base station schedules the cell edge user in the sector to a sub-resource block corresponding to the sector.
  • the central area user in the sector may be scheduled by the base station to the sub-resource blocks corresponding to the other sectors in the N resource blocks. on.
  • the transmission power used on the base station For each of the plurality of sectors belonging to different cells and adjacent to each other, the transmission power used on the base station.
  • step 20 for the sector edge user in the cell, the user may be scheduled by the base station to the second resource block except the above-mentioned sub-resource block, and the downlink data is transmitted by means of joint data transmission.
  • the joint data transmission method includes:
  • the corresponding transmitting antennas of each sector participating in the joint data transmission transmit data s on the same frequency.
  • the corresponding transmitting antennas of each sector participating in the joint data transmission transmit data on the same frequency.
  • the downlink interference suppression system includes:
  • a first subsystem configured to: when scheduling users in different sectors that belong to different cells and adjacent to each other, scheduling cell edge users of different sectors in the multiple sectors to different resources
  • a second subsystem configured to: transmit, by the sector edge user in the cell, downlink data for the sector edge user by using a sector of the sector edge user and a neighboring sector in a joint data transmission manner .
  • the first subsystem includes:
  • a first device configured to: divide, in the frequency domain, part or all resources of the downlink transmission frame that are shared by the multiple cells that belong to different cells and are adjacent to each other, into a sub-resource block, each sub-resource block Corresponding to one of the plurality of sectors, wherein ⁇ is greater than or equal to the number of the plurality of sectors;
  • a second device configured to: schedule, for each of the plurality of sectors belonging to different cells and adjacent to each other, a cell edge user in the sector to a sub-sector corresponding to the sector Resource block On.
  • the second device is further configured to: schedule, for each of the plurality of sectors belonging to different cells and adjacent to each other, the central area user in the sector to the N sub-resource blocks On the sub-resource block corresponding to other sectors.
  • the second subsystem includes a transmit antenna of each sector participating in the joint data transmission, and the transmit antenna of each sector participating in the joint data transmission is set to: transmit data W iS on the same frequency.
  • S represents a data symbol vector of a sector edge user to be transmitted;
  • the second subsystem includes a transmit antenna for each sector participating in the joint data transmission, and the transmit antenna of each sector participating in the joint data transmission is set to: transmit data on the same frequency
  • the second device is further configured to: use, for each of the plurality of sectors that belong to different cells and are adjacent to each other, the transmit power used on the sub-resource blocks scheduled by the cell edge user is greater than Transmit power used on other sub-resource blocks.
  • a downlink transmission frame shared by each subordinate of a plurality of neighboring base stations is in a continuous time period ti (for example, applied in OFDM (Orthogonal Frequency Division Multiplexing) / OFDMA (Orthogonal Frequency Division Multiplexing)
  • the Frequency Division Multiple Access (OFDM) system may include consecutive multiple OFDM or OFDMA transmission symbols) and the time-frequency two-dimensional resource block of the entire bandwidth is set to 3 ⁇ 4. And further divided into three sub-resource blocks A/j, Ptf-2, Ptf-3, and the size of each resource block may be predetermined by the system, or determined by the neighboring base stations according to the current traffic load situation. .
  • Each neighboring base station sets a subsequent time period t 2 (such as applying a plurality of consecutive OFDM or OFDMA transmission symbols in an OFDM/OFDMA system) and a time-frequency two-dimensional resource block of the entire bandwidth to P t2 , each base station The corresponding 3 ⁇ 4 can be different.
  • the following resource block division method may be used: setting the resource block where the subframe I is located to P tl , and the subframe z+1 The resource block is set to P t2 , and the resource block where the subframe z+2 is located is set to set the resource block where the subframe & 3 is located, and so on. Then, 3 ⁇ 4 further sub-divided into three resource blocks A / j, P t fj, Ptf-3, and the size of each resource block may be predetermined by the system in advance, or negotiated between the neighboring base station based on the current traffic load determine.
  • the following resource block division method may be used: setting the resource blocks in which subframes I and z+1 are located as P tl , and sub-frame z+ 2 and z+3 where the resource block is set to be deduced by analogy. Then, it will be further divided into three sub-resource blocks A/j, P tf 2 , P tfJ , and the size of each resource block may be predetermined by the system or determined by the neighboring base stations according to the current traffic load condition.
  • the following resource block division method may be used: Set the resource block where the subframes ⁇ + ⁇ and z+2 are located to P tl , and set the subframe And The resource block is set to 3 ⁇ 4. Then, it will be further divided into 3 sub-resource blocks ⁇ /", ⁇ / - 2, P tf j, and the size of each resource block can be pre-defined by the system, or negotiated by neighboring base stations according to the current traffic load situation. determine.
  • the first resource block 3 ⁇ 4 can occupy one or more consecutive or discontinuous subframes in the time domain, and The second resource block 3 ⁇ 4 may also occupy one or more consecutive or discontinuous subframes in the time domain.
  • the downlink interference suppression method of the present invention will be further described below with an application example.
  • the resource block partitioning method according to the above application example 2 is used. Since the resource block partitioning method has been described in detail in the foregoing, the following examples are only used to explain how the base station performs user scheduling on the resource blocks that have been divided. .
  • the three adjacent base stations respectively use the following scheduling methods for the users of each subordinate sector (assuming that among the three base stations, the sector 1 in the base station 1 and the sector 2 in the base station 2 Sector 3 in base station 3 is an adjacent sector):
  • Base station 1 dispatches cell edge users in sector 1 to ⁇ /"; schedules central area users in sector 1 to ⁇ /-2 and/or on.
  • the transmission power used by the base station 1 is greater than the transmission power used at P tfJ and P t f- 3 .
  • the base station 2 dispatches the cell edge users in sector 2 to Ptf 2 and schedules the central area users of sector 2 to and/or.
  • the base station 2 uses a transmission power greater than ⁇ /-2 for transmission power used on P tf l and/or P tf 3 .
  • the base station 3 dispatches the cell edge user of sector 3 to ⁇ /-j; and schedules the central area user of sector 3 to P tf l and/or P tf 2 .
  • the transmission power used by the base station 3 on P tfJ is greater than the transmission power used on P tf l and / or ⁇ / - 2 .
  • the sector edge users in the subordinates of the own base station are scheduled to be transmitted to the sector, and the downlink data is transmitted for the sector edge users by means of joint data transmission.
  • the sub-resource block scheduled by the cell edge user has remaining resources.
  • the sector edge user may also be scheduled to the sub-resource block scheduled by the cell edge user.
  • the data sent by sector 1 is JVjS
  • the data sent by sector 2 is JV 2 s
  • the precoding matrix W of sector 1 is a matrix of N tl X
  • N i7 is the number of transmit antennas of sector 1
  • the precoding matrix W 2 of sector 2 is a matrix of N t2 x L
  • N i2 is a sector The number of transmit antennas of 2.
  • the data to be transmitted sent to the two users is respectively, and the base station first pre-codes the column vectors composed of the two transmission data by using the precoding matrix of the multiple sectors, and then uses the corresponding transmission of each sector.
  • the antenna transmits the precoded data on the same frequency.
  • the data sent by sector 1 is Wjs
  • the data sent by sector 2 is W 2 s
  • the precoding matrix of sector 1 is a matrix of N tl x L
  • N tl is the number of transmit antennas of sector 1
  • the precoding matrix 2 of sector 2 is a matrix of N t2 x L
  • N i2 is a fan The number of transmit antennas in zone 2.
  • the present invention solves the problem of co-channel interference of cell edge and sector edge users, and improves the spectrum utilization rate of the center users of the sector, so that the efficiency of the same-frequency networking is greatly improved.

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

Abstract

L'invention porte sur un procédé et un système de suppression de brouillage en liaison descendante, le procédé comprenant les opérations suivantes : des abonnés de bord de cellule, dans des secteurs différents parmi une pluralité de secteurs, sont planifiés sur des ressources différentes lors d'une planification d'abonnés dans la pluralité de secteurs qui appartiennent à des cellules différentes et sont adjacents l'un à l'autre; et pour un abonné en bord de secteur dans la cellule, le secteur dans lequel se trouve l'abonné en bord de secteur et les secteurs auxquels l'abonné en bord de secteur est adjacent envoient des données de liaison descendante pour l'abonné en bord de secteur en mode de transmission de données unifiée. Le système comprend : un premier sous-système et un second sous-système. Par adoption de la présente invention, le problème de brouillage à la même fréquence de l'abonné en bord de cellule et de l'abonné en bord de secteur est résolu, et le taux d'utilisation du spectre d'un abonné en centre de secteur est amélioré, ainsi l'efficacité de réseautage à la même fréquence est fortement améliorée.
PCT/CN2011/075177 2010-12-30 2011-06-02 Procédé et système de suppression de brouillage en liaison descendante Ceased WO2012088834A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010106151971A CN102547737A (zh) 2010-12-30 2010-12-30 一种下行干扰抑制方法及系统
CN201010615197.1 2010-12-30

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WO2012088834A1 true WO2012088834A1 (fr) 2012-07-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1885752A (zh) * 2005-06-20 2006-12-27 华为技术有限公司 多小区频率复用的实现方法
CN101621318A (zh) * 2008-07-05 2010-01-06 中兴通讯股份有限公司 一种多输入多输出系统中用户传输数据的方法
CN101668295A (zh) * 2009-05-31 2010-03-10 北京邮电大学 通信系统中支持协作传输的资源复用方法及系统
WO2010068011A2 (fr) * 2008-12-08 2010-06-17 Lg Electronics Inc. Procédé d'émission et de réception d'un canal physique partagé pour liaisons descendantes dans un système de radiocommunications

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080159252A1 (en) * 2006-12-29 2008-07-03 Qi Bi Method of coordinated transmission for broadcast-multicast services in high data rate networks
CN101291198A (zh) * 2007-04-18 2008-10-22 松下电器产业株式会社 在无线通信系统的重传中重新安排比特的方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1885752A (zh) * 2005-06-20 2006-12-27 华为技术有限公司 多小区频率复用的实现方法
CN101621318A (zh) * 2008-07-05 2010-01-06 中兴通讯股份有限公司 一种多输入多输出系统中用户传输数据的方法
WO2010068011A2 (fr) * 2008-12-08 2010-06-17 Lg Electronics Inc. Procédé d'émission et de réception d'un canal physique partagé pour liaisons descendantes dans un système de radiocommunications
CN101668295A (zh) * 2009-05-31 2010-03-10 北京邮电大学 通信系统中支持协作传输的资源复用方法及系统

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