WO2013166880A1 - Procédé et dispositif permettant de réguler les interférences - Google Patents

Procédé et dispositif permettant de réguler les interférences Download PDF

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Publication number
WO2013166880A1
WO2013166880A1 PCT/CN2013/072221 CN2013072221W WO2013166880A1 WO 2013166880 A1 WO2013166880 A1 WO 2013166880A1 CN 2013072221 W CN2013072221 W CN 2013072221W WO 2013166880 A1 WO2013166880 A1 WO 2013166880A1
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WO
WIPO (PCT)
Prior art keywords
transmission
downlink
tdd uplink
subframe
uplink
Prior art date
Application number
PCT/CN2013/072221
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English (en)
Chinese (zh)
Inventor
徐婧
潘学明
沈祖康
Original Assignee
电信科学技术研究院
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Publication of WO2013166880A1 publication Critical patent/WO2013166880A1/fr

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Classifications

    • 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
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for interference control. Background technique
  • the Time Division Duplex (TDD) system has received more and more attention in the context of the increasing bandwidth demand for broadband mobile communications.
  • the uplink and downlink transmissions use the same frequency resource to transmit uplink/downlink signals on different time slots.
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • TD-SCDMA-Long Term Evolution TD-LTE
  • the division of the uplink and downlink time slots is static or semi-static.
  • the uplink/downlink time slot ratio is determined and remains unchanged according to the cell type and the approximate service ratio. .
  • the TDD mode means that the uplink/downlink uses the same working frequency band, and the uplink/downlink signals are transmitted at different time intervals, and there is a guard interval (GP) between the uplink and the downlink;
  • GP guard interval
  • the uplink/downlink uses different working frequency bands, and the uplink/downlink signals can be transmitted on different frequency carriers at the same time.
  • GB guard bandwidth
  • a radio frame in a TDD mode TD-LTE system, has a length of 10 ms, and a radio frame is divided into two halves (half frames), and each half frame includes A special subframe and four regular subframes, one radio frame includes a total of 10 subframes (ie, subframes) of a special subframe and a regular subframe, and each The length of the subframe is lms; wherein, the special subframe is divided into three slots: a downlink pilot slot (DwPTS), a GP, and an uplink pilot slot (UpPTS), and the regular subframe includes an uplink subframe and a downlink subframe.
  • a frame is used to transmit uplink/downlink control signaling and service data.
  • two special subframes (located in subframes #1 and #6) or a special subframe (located in subframe #1) can be configured.
  • Subframe #0 and subframe #5 and the DwPTS slot in the special subframe are always used for downlink transmission, and the UpPTS slot in subframe #2 and special subframe is always used for uplink transmission, and other subframes can be used as needed.
  • the sum of the three timeslots of the DwPTS/GP/UpPTS in the special subframe is lms, and the different configurations of the three slot lengths are used to support different TDD uplink and downlink configurations, as shown in Table 1.
  • Table 7 shows the configuration of the seven types of TDD uplink and downlink.
  • the specific configuration parameters are as shown in Table 2 below.
  • the D indicates that the subframe is used for downlink transmission
  • U indicates that the subframe is used for uplink transmission
  • S indicates that the subframe is Special sub-frames, including DwPTS, GP and UpPTS.
  • Table 2
  • the special subframe configuration mode shown in Table 1 and the uplink and downlink subframe configuration mode shown in Table 2 are broadcasted by the network side to all users in the cell through SI (System Information).
  • the TD-LTE standard can support the change of the special subframe configuration and the uplink and downlink subframe configuration by means of System Information Change, but this change needs to be through paging and re-reading system information. Wait for the process to be implemented, and there will be thousands of problems before and after the change. For example, the Hybrid Automatic Repeat ReQuest (HQQ) operation and scheduling may be adversely affected. For example, if the special subframe configuration and the uplink/downlink subframe frame configuration change frequently, system performance may be seriously degraded. Moreover, the minimum frame configuration change period supported by the TD-LTE standard is 640 ms, which cannot fully adapt to the dynamic change of the service.
  • HQQ Hybrid Automatic Repeat ReQuest
  • the time period is a radio frame (for example, other time periods), where subframe #0 and subframe #5 are fixed downlink subframes, subframe #2 and subframes. #7 is a fixed uplink subframe, and subframe #1 and subframe #6 are special subframes (which can also be classified as fixed downlink subframes), and other subframes (for example, subframe #3, subframe #4, subframe) #8, subframe #9) can be flexibly allocated as uplink or downlink transmission subframes.
  • the base station can be dynamically configured according to real-time service requirements and channel conditions to adapt to dynamic changes in service requirements.
  • a method of dynamically configuring a TDD subframe is given in the prior disclosed scheme.
  • adjacent cells are caused.
  • the cross-slot interference of the zone for example, within the same time period, one cell in the neighboring cell is configured for uplink transmission, and the other cell is configured for downlink transmission, which causes cross-slot interference.
  • the foregoing neighboring cells may refer to geographically adjacent cells using the same TDD carrier, as shown in FIG. 4, or may refer to geographically overlapping or adjacent cells using adjacent TDD carriers.
  • the foregoing cell may be a cell deployed in the same layer, for example, a macro cell, or a layered cell, such as a macro cell, a micro cell, a home base station coverage cell, and the like.
  • Embodiments of the present invention provide a method and apparatus for performing interference control to reduce cross-slot interference in a TD-LTE system.
  • a method of interference control including:
  • the transmission node is divided into multiple clusters based on the coupling path loss between the transmission nodes in the TDD network.
  • the TDD uplink and downlink reference configuration and TDD of each transmission node are determined based on the TDD uplink and downlink configuration reference information reported by each transmission node. /downside traffic;
  • the interference reduction adjustment is performed for the transmission node included in the cluster in which the cross-slot interference is present in the set subframe.
  • a device for interference control comprising:
  • a dividing unit configured to divide each transmission node into a plurality of clusters based on a coupling path loss between each transmission node in the TDD network
  • a determining unit configured to determine, according to the TDD uplink and downlink configuration reference information reported by each transmitting node, a TDD uplink and downlink reference configuration and a TDD uplink/downlink traffic of each transmitting node;
  • a determining unit configured to determine, according to the TDD uplink and downlink reference configuration and the TDD uplink/downlink traffic of each transmission node, whether there is a cross-slot interference between each transmission node included in each cluster in the set subframe;
  • an adjusting unit configured to perform a interference reduction adjustment on a transmission node included in a cluster that has a cross-slot interference in the set subframe.
  • the central node divides each transmission node into multiple clusters based on the coupling path loss between the transmission nodes, and then determines according to the TDD uplink and downlink reference configuration of the transmission node and the TDD uplink/downlink traffic volume.
  • FIG. 1 is a schematic diagram of a time-frequency relationship of a basic duplex mode in the prior art
  • FIG. 2 is a schematic diagram of a frame structure of a TD-LTE system in the prior art
  • FIG. 3 is a schematic diagram of a dynamic TDD uplink/downlink subframe allocation scheme in the prior art
  • FIG. 4 is a schematic diagram of a TDD cross-slot interference in the prior art
  • FIG. 5 is a schematic diagram of a TDD uplink and downlink configuration with different TDD carriers set in the prior art
  • FIG. 6 is a schematic structural diagram of a central node in an embodiment of the present invention.
  • FIG. 7 is a flowchart of performing interference control for a TDD system according to an embodiment of the present invention. detailed description
  • each transmission node is divided into multiple clusters based on the coupling path loss between the transmission nodes, and then based on the TDD reported by each transmission node. Determining the TDD uplink and downlink reference configuration and the TDD uplink/downlink traffic of each transport node, and determining the TDD uplink and downlink reference configuration and the TDD uplink/downlink traffic of each transport node, respectively, in the set subframe Whether there is cross-slot interference between each transmission node included in each cluster; and performing interference reduction adjustment for the transmission node included in the cluster in which the cross-slot interference exists in the set subframe.
  • the central node includes a dividing unit 60, a determining unit 61, a determining unit 62, and an adjusting unit 63, wherein
  • the dividing unit 60 is configured to divide each transmission node into multiple clusters based on a coupling path loss between each transmission node in the TDD network;
  • the determining unit 61 is configured to determine, according to the TDD uplink and downlink configuration reference information reported by each transmitting node, a TDD uplink and downlink reference configuration and a TDD uplink/downlink traffic of each transmission node;
  • the determining unit 62 is configured to: according to the TDD uplink and downlink reference configuration and the TDD uplink/downlink traffic of each transmission node, Determining whether there is a cross-slot interference between each of the transmission nodes included in each cluster in the set subframe; and adjusting unit 63 for including in the cluster in which the cross-slot interference exists in the set subframe
  • the transmission node performs the interference reduction adjustment.
  • the transit node may be a cell base station (for example, a macro base station, a micro base station, a pico base station, etc.) in the TDD standard network, or may be a remote radio head (RRH), and the central node may be a center.
  • the controller can also be one of the transfer nodes.
  • the detailed process of the central node performing interference control on the TDD system network is as follows:
  • Step 700 The central node divides each transmission node into a plurality of clusters based on a coupling loss between the transmission nodes, wherein the Coupling loss characterizes the degree of cross-interference between the two transmission nodes.
  • a transport node within a cluster may be a geographically adjacent transport node that uses the same TDD carrier, or a geographically overlapping or adjacent transport node that uses adjacent TDD carriers.
  • the specific division is as follows:
  • the central node can first obtain the Coupling loss of each transport node.
  • the transmission node After the transmission node obtains the Coupling loss between itself and other transit nodes, the information can be reported to the central node and managed by the central node. Of course, the transit node can also pass the interface between the two nodes. Let share the coupling loss information.
  • the central node may cluster each of the transport nodes based on the obtained Coupling loss between the transport nodes. Specifically:
  • the central node may set a Coupling loss threshold T.
  • the determination of the threshold T is related to the cell type, the transmission node spacing, the transmission node type, the transmission node deployment mode, and the like, and the specific threshold value T between different types of transmission nodes. The value may be different. For example, between Macro and Pico, between Pico and Pico, between Macro and Femto, the threshold value T may be different. For the convenience of description, each transmission is assumed in this embodiment.
  • the threshold value T between nodes is the same.
  • the determination of the threshold value T can be obtained by means of simulation traversal, or by empirical values, or by actual testing.
  • the transmission node may be selected in turn, and the Coupling loss between the currently selected transmission node and other transmission nodes is respectively compared with the correlation threshold T. In comparison, it is determined whether there is a transmission node that is closer to the currently selected transmission node.
  • the currently selected transmission node has a Coupling loss > T to all other transmission nodes, it is considered that for the currently selected transmission node, there is no transmission node with a relatively close distance and a large interference probability, and the currently selected transmission node is selected.
  • this cluster contains only a single element (that is, only one element of the current transit node);
  • Step 710 The central node receives the TDD uplink and downlink configuration reference information reported by each transit node.
  • the TDD uplink and downlink configuration reference information reported by each transit node may be an uplink/downlink traffic of the transport node (for example, the number of bits occupied by the uplink/downlink service), or may be a TDD independently configured by the transport node.
  • the uplink and downlink reference configuration (for example, the seven types shown in Table 2) and the uplink/downlink traffic, where the reason is called the TDD uplink and downlink reference configuration, because the TDD uplink and downlink configuration actually used by the transmission node may be related to itself.
  • the previously configured TDD uplink and downlink configurations are different. Therefore, the latter is referred to as the TDD uplink and downlink reference configuration.
  • Step 720 The central node determines the TDD uplink and downlink reference configuration and the TDD uplink/downlink traffic of each transport node according to the obtained TDD uplink and downlink configuration reference information of each transport node.
  • transport node A Take any one of the transport nodes (hereinafter referred to as transport node A) as an example:
  • the central node directly determines the TDD uplink/downlink traffic of the transport node A according to the TDD uplink and downlink configuration reference information. And allocating the appropriate TDD uplink and downlink reference configuration to the transit node A according to the TDD uplink/downlink traffic;
  • the central node directly determines the TDD reference of the transport node A according to the TDD uplink and downlink configuration reference information. Configuration and TDD up/down traffic can be.
  • Step 730 The central node determines, according to the TDD uplink and downlink reference configuration and the TDD uplink/downlink traffic of each transport node, whether there is cross-slot interference between each transport node included in each cluster in the set subframe.
  • the so-called setting subframe refers to a subframe that can be flexibly configured as an uplink transmission or a downlink transmission in each radio frame.
  • the frame may be subframe #3, subframe #4, subframe #8, and subframe #9 therein.
  • cluster A the central node according to the TDD uplink and downlink reference of each transmission node in cluster A
  • the configuration and the TDD uplink/downlink traffic determine whether there is a cross-slot interference between each of the transmission nodes included in the cluster A in any of the set subframes (hereinafter referred to as subframe A), but may be used but not Limited to the following methods:
  • the TDD uplink and downlink reference configuration reported by the transit node A in the cluster A indicates that the transport node A is configured with uplink transmission in the subframe A
  • the TDD uplink and downlink reference configuration reported by the transport node B in the cluster A indicates that the transport node B is in the Downlink transmission is configured in subframe A.
  • a certain transmission node is configured with uplink transmission or downlink transmission in subframe A, which only indicates that the transmission node can perform uplink transmission or downlink transmission in subframe A, and when actually performing data transmission, it is also possible that the transmission node is The data transmission is not performed in the subframe A. Therefore, the central node also needs to refer to the TDD uplink/downlink traffic on the transmission node to determine whether it actually performs uplink transmission or downlink transmission in the subframe A.
  • the TDD uplink/downlink reference traffic reported by the transit node A in the cluster A indicates that the transport node A will perform uplink transmission in the subframe A
  • the TDD uplink/downlink traffic indication transmission reported by the transit node B in the cluster A Node B will perform downlink transmission in subframe A.
  • Step 740 The central node performs a interference reduction adjustment on the transmission node included in the cluster in which the cross-slot interference exists in the set subframe.
  • the central node when performing step 740, may perform, but is not limited to, any one of the following operations:
  • the central node transmits a transmission node that performs downlink transmission in the set subframe or all transmission nodes in the cluster in the set subframe. Adjust to uplink transmission.
  • a transit node configured for downstream transmission but not actually transmitting data.
  • the center The node can directly use the adjusted TDD uplink and downlink subframe configuration mode, or refer to the related standard, and further adjust the adjusted TDD to the downlink subframe configuration mode to the TDD uplink and downlink configuration defined in the standard.
  • the whole is The TDD uplink and downlink configuration with the smallest difference between the uplink/downlink subframe ratios shown in Table 2, for example, the central node will transmit the node in a certain subframe.
  • the TDD uplink and downlink subframe configuration mode of the transmission node is adjusted to DSUDUUDUU by DSUUUDSUUU, wherein the ratio of the uplink/downlink subframe is adjusted from 6:2 to 4:4, and is not in the standard.
  • the TDD uplink and downlink configuration is defined. In the TDD uplink and downlink configuration shown in Table 2, the TDD uplink and downlink configuration 1 is DSUUDDSUUD, and the uplink and downlink subframe configuration is also 4:4.
  • the uplink/downlink subframe with the DSDUUDSDUU If the ratio difference is the smallest, the TDD uplink and downlink subframe configuration mode of the transmission node can be further adjusted from "DSDUUDSDUU" to "DSUUDDSUUD".
  • the central node will reduce the transmission node in the cluster in the set subframe or reduce all the transmission nodes in the cluster, in the set subframe
  • the downlink transmit power within is reduced.
  • the central node indicates the transmission node in the cluster that performs downlink transmission in the set subframe or all the transmission nodes in the indication cluster, in the set subframe No downlink signal transmission is performed, and of course, uplink signal transmission can be performed.
  • the central node divides each transmission node into multiple clusters based on the coupling path loss between the transmission nodes, and then according to the TDD uplink and downlink reference configuration and the TDD uplink/downlink service of the transmission node. And determining whether there is a cross-slot interference between each of the transmission nodes included in each cluster in the set subframe, and for the transmission node included in the cluster in which the cross-slot is disturbed in the set subframe Performing the interference adjustment, so that not only can the cross-slot interference between the transmission nodes be effectively reduced or avoided in each subframe, but also the flexibility of the subframe configuration manner between the transmission nodes can be maximized, and thus significant Improved system performance.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer-usable storage interfaces including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory include instructions.
  • the manufacturing device, the instruction device implements the functions specified in one or more blocks of a flow or a flow and/or a block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

La présente invention se rapporte au domaine des communications et porte sur un procédé et sur un dispositif permettant de réguler les interférences. Le procédé comprend les étapes suivantes : un nœud central divise des nœuds de transmission en multiples grappes de serveurs sur la base de la perte de trajet de couplage entre les nœuds de transmission ; le nœud central détermine, selon la configuration de référence de liaison montante et de liaison descendante de duplexage par répartition dans le temps (TDD pour Time Division Duplex) et le trafic de liaison montante/liaison descendante de duplexage TDD du nœud de transmission, si des interférences de créneaux temporels croisés existent entre les nœuds de transmission inclus dans chaque grappe de serveurs dans une sous-trame déterminée, et effectue un ajustement de réduction des interférences sur le nœud de transmission inclus dans la grappe de serveurs dans la sous-trame déterminée qui présente les interférences de créneaux temporels croisés, de sorte non seulement à abaisser de manière efficace les interférences de créneaux temporels croisés ou à éviter ces dernières entre les nœuds de transmission dans chaque sous-trame, mais également à maximiser la flexibilité d'un schéma de configuration de sous-trame entre les nœuds de transmission, ce qui permet d'améliorer de façon significative la performance du système.
PCT/CN2013/072221 2012-05-11 2013-03-06 Procédé et dispositif permettant de réguler les interférences WO2013166880A1 (fr)

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CN104780599A (zh) * 2014-01-14 2015-07-15 中国移动通信集团公司 一种上行功率控制方法及装置
CN105101234B (zh) * 2014-05-08 2020-10-02 索尼公司 对时分双工网络中的小小区进行分簇的装置、方法及基站
CN105228234B (zh) * 2014-06-12 2019-05-28 华为技术有限公司 干扰控制方法和设备、基站
CN104378785B (zh) * 2014-11-17 2017-12-19 电信科学技术研究院 一种微小区的上下行子帧重配置方法和装置
CN106131965B (zh) * 2016-08-15 2019-11-12 宇龙计算机通信科技(深圳)有限公司 非授权频段上的子帧配置方法及子帧配置装置
CN108632968B (zh) * 2017-03-24 2021-01-29 华为技术有限公司 用于上行功率控制的方法和装置
CN108366429B (zh) * 2018-02-09 2021-12-24 京信网络系统股份有限公司 一种上下行时隙的调整方法及装置
CN113853013A (zh) * 2020-06-28 2021-12-28 华为技术有限公司 一种干扰协调方法、装置和系统

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