WO2013107121A1 - Procédé et système d'élimination d'interférence intercellulaire - Google Patents

Procédé et système d'élimination d'interférence intercellulaire Download PDF

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Publication number
WO2013107121A1
WO2013107121A1 PCT/CN2012/074209 CN2012074209W WO2013107121A1 WO 2013107121 A1 WO2013107121 A1 WO 2013107121A1 CN 2012074209 W CN2012074209 W CN 2012074209W WO 2013107121 A1 WO2013107121 A1 WO 2013107121A1
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WO
WIPO (PCT)
Prior art keywords
terminal
cell
virtual cell
base station
virtual
Prior art date
Application number
PCT/CN2012/074209
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English (en)
Chinese (zh)
Inventor
李毅
谢忠时
Original Assignee
中兴通讯股份有限公司
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.)
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Publication date
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Publication of WO2013107121A1 publication Critical patent/WO2013107121A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

Definitions

  • the present invention relates to Long Term Evolution (LTE) technology, and more particularly to a method and system for eliminating inter-cell interference. Background technique
  • the uplink uses Orthogonal Frequency Division Multiple Access (OFDMDMA) transmission technology
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • Transmission technology therefore, it is not possible to eliminate interference between cells by, for example, a spread spectrum method like the code division multiple access (CDMA) transmission technology.
  • CDMA code division multiple access
  • GSM Global System of Mobile communication
  • the interference randomization method refers to: using cell-specific scrambling and cell-specific interleaving, where the cell-specific interleaving is an interleaving multiple access known to those skilled in the art; or, using a frequency hopping method.
  • the method of cell-specific scrambling and cell-specific interleaving is adopted. Because only the interference of 'j and interval is randomized, although the interference of the interval can be reduced to a certain extent, the method cannot be well eliminated.
  • the method of frequency hopping will also greatly increase the complexity of the system.
  • the method of interference cancellation refers to: relying on the spatial suppression of the terminal multi-antenna reception and the detection/subtraction-based elimination method, the method needs to rely on terminal support.
  • the method of interference coordination/avoiding refers to: coordinating between cells to limit the allocation method of downlink resources, for example: obtaining a signal to noise ratio and a cell by limiting the time-frequency domain resources and transmission power allocation of neighboring cells.
  • the performance improvement of the boundary data rate and coverage because the interference coordination/avoiding method limits the downlink resource allocation, it tends to reduce the spectrum utilization.
  • the base station adopts a beamforming antenna method, and in the downlink direction, the interference of the interval can be reduced.
  • the main object of the present invention is to provide a method and system for eliminating inter-cell interference, which can effectively eliminate interference between cells and further improve the throughput of the LTE system.
  • the present invention provides a method for eliminating inter-cell interference, the method comprising:
  • Level public resources CP, Cell Portion
  • the base station When performing the service, the base station determines the CP from the virtual cell to which the terminal belongs according to the current radio link status, and performs transmission and reception of the service data through the determined CP.
  • the base station determines the CP from the virtual cell to which the terminal belongs according to the current radio link status, and is:
  • the base station determines the CP from the virtual cell to which the terminal belongs according to the currently measured signal strength of the terminal on each CP in the virtual cell.
  • the base station determines the CP from the virtual cell to which the terminal belongs according to the signal strength of the terminal in the virtual cell, which is obtained by the current measurement, as follows:
  • the base station compares the currently measured signal strength of the terminal on each CP in the virtual cell with the set threshold, and determines the CP in the virtual cell whose signal strength exceeds the threshold as the current terminal. Activate the CP collection.
  • the method further includes:
  • the base station compares the signal strength of each terminal of the terminal in the virtual cell with the set threshold value, and updates the terminal by using the CP in the virtual cell whose signal strength exceeds the threshold value.
  • the current active CP collection is a short term that is associated with the base station.
  • the sending and receiving of the service data by using the determined CP is: the base station sends the service data to each CP in the determined active CP set of the terminal, and simultaneously sends the data to the terminal. ;
  • the base station combines and demodulates the service data sent by the terminal received on each CP in the currently activated CP set of the terminal to obtain the service data sent by the terminal.
  • the method further includes: when it is required to send the control channel information, and/or the cell common information, the base station sends the control channel information, and/or the cell common information to each CP in the virtual cell, and simultaneously sends the information to the Said terminal.
  • the present invention also provides a system for eliminating inter-cell interference, the system comprising: a configuration unit and a base station;
  • a configuration unit configured to configure one or more virtual cells on the base station, and configure two or more physical cells for each virtual cell, each physical cell as a CP, and configure all CPs in each virtual cell to share cell-level common resources ;
  • the base station is configured to: when the service is performed, the base station determines the CP from the virtual cell to which the terminal belongs according to the current radio link status, and performs transmission and reception of the service data by using the determined CP.
  • the base station is further configured to: when the control channel information needs to be sent, and/or the cell For public information, the control channel information, and/or the cell common information are transmitted to each of the virtual cells.
  • the determining, according to the current radio link status, the CP from the virtual cell to which the terminal belongs is:
  • the CP is determined from the virtual cells to which the terminal belongs according to the signal strength of the terminal on the CPs in the virtual cell.
  • the determining, according to the signal strength of each terminal of the terminal in the virtual cell, the CP is determined from the virtual cell to which the terminal belongs, as follows:
  • the base station is further configured to compare, by using the periodically measured, the signal strength of each terminal of the terminal in the virtual cell with the set threshold, and adopting a signal strength exceeding a threshold.
  • the CP in the virtual cell updates the current active CP set of the terminal.
  • the method and system for eliminating inter-cell interference provided by the present invention, configuring one or more virtual cells on a base station, and configuring two or more physical cells for each virtual cell, each physical cell as a CP, and configured in each virtual cell All the CPs share the common resources of the cell level; when performing the service, the base station determines the CP from the virtual cell to which the terminal belongs according to the current radio link status, and performs transmission and reception of the service data through the determined CP, and thus, It can effectively eliminate inter-cell interference and improve the throughput of the LTE system.
  • the coverage of the extended virtual cell is several times larger than that of the conventional physical cell, thereby reducing the switching rate and the dropped call rate of the edge users, thereby effectively
  • the problem of the handover rate and the dropped call rate caused by the limited coverage of the cell in the wireless mobile communication system is solved.
  • the technical solution provided by the present invention does not rely on communication with a base station, nor does it depend on a neighboring area.
  • the use of the radio resource is completely transparent to the terminal and is only implemented on the base station side. Therefore, the solution provided by the present invention can be compatible with the current LTE system design, and supports the normal cell hybrid group in the LTE system that does not use the technical solution of the present invention. network. DRAWINGS
  • FIG. 1 is a schematic flowchart of a method for eliminating inter-cell interference according to the present invention
  • FIG. 2 is a schematic flowchart of a method for eliminating inter-cell interference according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a system for eliminating inter-cell interference according to the present invention. detailed description
  • Step 100 Configure one or more virtual cells on a base station, and configure two or more physical cells for each virtual cell, and each physical cell serves as one The CP, and all the cells in each virtual cell are configured to share the cell-level common resources, and then step 101 is performed;
  • Step 101 When performing the service, the base station determines the CP from the virtual cell to which the terminal belongs according to the current radio link status, and performs service data transmission and reception through the determined CP.
  • the base station determines the CP from the virtual cell to which the terminal belongs according to the current radio link status, specifically:
  • the base station determines the CP from the virtual cell to which the terminal belongs according to the signal strength of the terminal on the CP in the virtual cell.
  • the CP is determined to be the current active CP set of the terminal.
  • the number of CPs determined from the virtual cell to which the terminal belongs may be one or more, in other words, in actual application, the CP determined from the virtual cell to which the terminal belongs The number can be more than one.
  • the number of CPs in the current active CP set of the terminal may be more than one.
  • the sending and receiving of the service data by using the determined CP is specifically:
  • the base station sends the service data to each of the determined CPs in the activated CP set of the terminal, and simultaneously sends the data to the terminal;
  • the base station combines and demodulates the service data sent by the terminal received on each CP in the currently activated CP set of the terminal to obtain the service data sent by the terminal.
  • each terminal belongs to only one of the virtual cells. That is, when determining the CP, the base station determines only the corresponding CP from the virtual cell to which the terminal belongs. The corresponding CP is not determined from all configured virtual cells.
  • the method may further comprise:
  • the base station periodically measures the signal strength of the CPs on the CPs in the virtual cell, and compares the measured signal strengths of the terminals on the CPs in the virtual cell with the set thresholds, and adopts The CP in the virtual cell whose signal strength exceeds the threshold increases the current active CP set of the terminal.
  • the method may further comprise:
  • the base station When it is required to transmit control channel information, and/or cell common information, the base station transmits control channel information, and/or cell common information to each CP in the virtual cell, and simultaneously transmits the same to the terminal.
  • the common information of the cell includes: a cell ID, a primary and secondary synchronization signal, a frequency hopping sequence, and a scrambling sequence.
  • Step 200 The OMC (Operation Maintenance Center) configures one or more virtual cells on the base station, and configures two virtual cells for each virtual cell. More than one physical community, Each physical cell acts as a CP, and all cells in each virtual cell are configured to share cell-level common resources;
  • OMC Operaation Maintenance Center
  • more than one virtual cell may be configured according to the network requirement, or may be mixed with a normal cell, and the configured virtual cell may be reflected on the bottom layer of the base station, but is invisible to the upper layer service and the terminal. That is, for high-level services and terminals, the virtual cell is treated equivalently to the normal cell.
  • the normal cell refers to: a physically existing physical cell; the specific process of configuring the virtual cell may adopt the prior art.
  • the two or more physical cells are: two or more physical cells that are geographically connected; where the physical cell is a cell covered by the base station.
  • a specific processing procedure for configuring two or more physical cells for each virtual cell is a technical means used by those skilled in the art, and details are not described herein again.
  • the configuration of the common cell-level common resource on all the CPs in each virtual cell means that the common resource of the cell level configured by each CP in each virtual cell is the same, and thus, for the terminal, only the base station is received through one cell.
  • the radio ends corresponding to the CPs send the same cell-level common resources to the terminal.
  • the cell-level public resources include: a cell ID, a primary and secondary synchronization signal, a frequency hopping sequence, and a scrambling sequence.
  • Step 201 The base station periodically updates the activated CP set of the terminal according to the acquired signal strength of the terminal on each CP in the virtual cell.
  • the base station periodically compares the measured signal strength of each terminal on each CP in the virtual cell with a set threshold, and forms a CP in the virtual cell whose signal strength exceeds the threshold, and forms the current The active CP collection of the terminal.
  • Step 202 When the base station needs to send information to the terminal, according to different types of information, The same CP sends information to the terminal;
  • the base station when the information is the control channel information, and/or the cell common information, the base station sends the control channel information, and/or the cell common information to each CP in the virtual cell, and simultaneously sends the information to the terminal;
  • the base station When the channel information is transmitted, the base station sends the traffic channel information to each CP in the currently activated CP set corresponding to the terminal, and simultaneously sends the information to the terminal.
  • the traffic channel information refers to service data.
  • the terminal After receiving the information, the terminal combines and demodulates the received information on each CP; the specific processing procedure of the terminal performing the combined demodulation is the same as the prior art, and details are not described herein again.
  • Step 203 When the terminal needs to send information, send information to the base station through each CP in the virtual cell.
  • the terminal since the terminal does not see each CP in the virtual cell, in this step, the actual operation of the terminal is completely the same as the specific processing procedure of transmitting information to the base station through the normal cell.
  • the information refers to service data.
  • Step 204 The base station receives the information sent by the terminal on each CP in the virtual cell, and combines and demodulates the information on each CP in the currently activated CP set corresponding to the terminal.
  • the signals received on each CP in the virtual cell are the same.
  • the specific processing of combining and demodulating the information on each CP in the currently activated CP set corresponding to the terminal may adopt the prior art.
  • the technical solution provided by the present invention is actually a macro diversity technology, and the macro diversity technology plays a very important role in the third generation mobile communication era.
  • the gain is obtained only by link adaptation and fast retransmission, and the technology that requires network architecture support such as macro diversity is abandoned.
  • OFDM Orthogonal Frequency Division Multiplexing
  • soft combining can be implemented by radio frequency combining in which the signal arrives at the terminal antenna at the time of the cyclic prefix window. This combination does not require any operation of the terminal. .
  • one or more virtual cells are configured in a network range, and each virtual cell is composed of a plurality of adjacent traditional physical cells, each physical cell is a CP, and multiple physical cells are bound. Forming a virtual cell equivalent to a traditional cell, each physical cell is one
  • the cell-level common resources are shared among all the CPs in the virtual cell, that is, the cell-level public resources need to be sent out on the radio terminals of the CPs of the virtual cell.
  • the base station According to the corresponding wireless air interface condition of the terminal, that is, according to the state of the wireless link, the base station periodically updates and maintains the activated CP set of each terminal, and then completes the transmission and reception of the service data through the activated CP set of each terminal. In other words, the base station determines which CPs in the virtual cell to transmit and receive with the service data between the terminals based on the state of the radio link.
  • the technical solution provided by the present invention by combining multiple CPs into one virtual cell, the coverage of the extended virtual cell is several times larger than that of the traditional physical cell, thus effectively eliminating inter-cell interference and improving the LTE system.
  • the throughput thereby reducing the switching rate and dropped call rate of the edge users, solves the problem caused by the limited coverage of the cell in the wireless mobile communication system.
  • a channel gain similar to macro diversity is obtained without requiring a "central node” such as a Radio Network Controller (RNC) to perform control.
  • RNC Radio Network Controller
  • the method provided by the present invention can be compatible with current system design, and supports hybrid networking of normal cells in an LTE system that does not use the technical solution of the present invention.
  • the present invention further provides a system for eliminating inter-cell interference.
  • the system includes: a configuration unit 31 and a base station 32;
  • the configuration unit 31 is configured to configure one or more virtual cells on the base station 32, and configure two or more physical cells for each virtual cell, each physical cell as one CP, and configure all CPs in each virtual cell to share the cell level.
  • Public resource ;
  • the base station 32 is configured to determine, according to the current radio link status, the CP from the virtual cell to which the terminal belongs, and perform the sending and receiving of the service data by using the determined CP.
  • the configuration unit 31 may specifically be an OMC.
  • the base station 32 is further configured to: when the control channel information and/or the cell common information needs to be sent, send the control channel information, and/or the cell common information to each CP in the virtual cell, and send the same to the terminal. .

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

Abstract

Procédé d'élimination d'interférence intercellulaire, le procédé comprenant les étapes consistant à : configurer plus d'une cellule virtuelle sur une station de base, et configurer plus de deux cellules physiques pour chaque cellule virtuelle, dans lequel chaque cellule physique agit comme une séparation de cellules (CP), et à configurer des ressources publiques au niveau de la cellule partagées par toutes les CP dans chaque cellule virtuelle; et lors de l'exécution d'un service, selon l'état de liaison sans fil courante, à ce que la station de base détermine une CP à partir de la cellule virtuelle à laquelle appartient un terminal, et envoie et reçoit des données de service selon la CP déterminée. L'invention concerne en même temps un système d'élimination d'interférence intercellulaire. L'application du procédé et du système de la présente invention peut efficacement éliminer une interférence intercellulaire, et ainsi améliorer le débit d'un système d'évolution à long terme (LTE).
PCT/CN2012/074209 2012-01-18 2012-04-17 Procédé et système d'élimination d'interférence intercellulaire WO2013107121A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2012100162295A CN102547994A (zh) 2012-01-18 2012-01-18 一种消除小区间干扰的方法及系统
CN201210016229.5 2012-01-18

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WO2017035761A1 (fr) * 2015-08-31 2017-03-09 华为技术有限公司 Procédé et appareil de transmission de données

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WO2015085561A1 (fr) * 2013-12-13 2015-06-18 华为技术有限公司 Procédé, dispositif et système de planification
CN107534877B (zh) * 2015-04-28 2021-06-15 瑞典爱立信有限公司 用于控制波束网格的设备和方法
CN107124759B (zh) * 2016-02-25 2020-08-07 南京中兴新软件有限责任公司 一种虚拟小区中同步传输节点的选择方法及设备
CN106604343B (zh) * 2016-11-25 2020-04-10 厦门大学 一种小区虚拟化的方法及装置
CN108184238B (zh) * 2016-12-08 2022-11-25 中兴通讯股份有限公司 一种数据传输方法及装置
CN106912060B (zh) * 2017-03-14 2019-12-10 东南大学 分布式系统中一种基于天线选择的高能效传输方法
CN110391887B (zh) * 2018-04-20 2021-11-09 华为技术有限公司 信号处理方法及装置
WO2019205169A1 (fr) * 2018-04-28 2019-10-31 华为技术有限公司 Procédé et dispositif de communication
KR20240040816A (ko) * 2021-08-05 2024-03-28 베이징 시아오미 모바일 소프트웨어 컴퍼니 리미티드 서빙 셀 측정 방법 및 장치

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