WO2015039522A1 - Procédé et dispositif de commande de commutation pour réseau sans fil - Google Patents

Procédé et dispositif de commande de commutation pour réseau sans fil Download PDF

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Publication number
WO2015039522A1
WO2015039522A1 PCT/CN2014/085229 CN2014085229W WO2015039522A1 WO 2015039522 A1 WO2015039522 A1 WO 2015039522A1 CN 2014085229 W CN2014085229 W CN 2014085229W WO 2015039522 A1 WO2015039522 A1 WO 2015039522A1
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WIPO (PCT)
Prior art keywords
cell
terminal
status
micro
control method
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PCT/CN2014/085229
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English (en)
Chinese (zh)
Inventor
李晓卡
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大唐移动通信设备有限公司
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Publication of WO2015039522A1 publication Critical patent/WO2015039522A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H04W36/008357—Determination of target cell based on access point [AP] properties, e.g. AP service capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H04W36/008375—Determination of triggering parameters for hand-off based on historical data

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a handover control method for a wireless network and a handover control apparatus.
  • BACKGROUND In a wireless cellular network, in order to support terminal mobility, when a terminal accesses a wireless network, the wireless network configures a corresponding measurement report for the terminal, and customizes a related measurement report trigger condition, and the terminal periodically contacts the serving cell and surrounding neighbors. The cell performs measurement and evaluation. When the measurement report condition is met, the terminal sends a measurement report to the network.
  • the measurement report usually includes the level value of the wireless signal strength and the wireless signal quality of the serving cell and the neighboring neighboring cells.
  • the wireless network After receiving the measurement report of the terminal, the wireless network performs a handover decision to determine whether the terminal satisfies the handover condition, when the wireless network determines When the terminal meets the handover condition, the terminal sends a handover preparation message to the neighboring cell, and the neighboring cell accepts the handover terminal.
  • the terminal determines that the terminal meets the admission condition
  • the terminal sends a handover control command to the neighboring cell, and the terminal performs the handover control command to the neighboring cell according to the handover command. Switch.
  • the hotspot area with high capacity requirements usually needs to provide the capacity of the cell by using multi-frequency overlapping overlay networking, hierarchical networking, hybrid networking, etc., to meet the people in the covered area. For the needs of various businesses.
  • multiple cell types are usually used to provide coverage and capacity solutions.
  • a macro cell with a large transmit power is used to provide continuous coverage.
  • a small cell, a pico cell, and the like which are low-power and easy to install, are added to the wireless network to absorb capacity.
  • the user is preferentially connected to the micro cell to absorb the capacity.
  • the current wireless network performs the judgment of the target cell according to the measured signal level of the neighboring cell and the local cell in the measurement report.
  • the coverage area of the micro cell or the pico cell is usually small.
  • the terminal when When the signal level of the micro cell or the pico cell measured by the terminal satisfies the switching condition, the terminal is switched to the micro cell or the pico cell. Since the cell radius of the micro cell is small, the terminal will be in medium or even high speed mobile. Switching to the micro cell will cause the terminal to frequently switch.
  • the handover of the wireless cellular network generally occurs at the cell edge, and the switching frequency increases, resulting in the handover process.
  • the technical problem to be solved by the present invention is: In a hierarchical networking scenario of a wireless cellular network, multiple cell types coexist and overlap coverage, and the mobile state of the terminal and the measured cell type cannot be known, thereby causing blind handover decisions and switching off calls. The rate is high and the user perception is poor.
  • the present invention provides a handover control method for a wireless network, which includes the steps of:
  • the measurement offset parameter is set according to the cell type of the target cell and the state of the terminal to control the handover of the terminal to the target cell.
  • the setting the cell type for each cell, and binding the cell type to the cell identifier includes: adding a cell type field to the cell identifier, and using the field to indicate the cell type.
  • the setting a cell type for each cell, and binding the cell type to the cell identifier includes: selecting a part of the bits in the cell identifier to indicate the cell type.
  • the cell type includes whether there is cell coverage.
  • the cell type includes a macro cell, a micro cell, a pico cell, an outdoor cell, and/or an indoor cell.
  • the status of the terminal includes a mobile state of the terminal.
  • the moving state includes a high speed motion state, a medium speed motion state, and a low speed motion state.
  • the cell type is set by using an operation and maintenance interface or the cell type is automatically set according to a parameter of the cell by using a software.
  • the detecting the status of the terminal includes: detecting a mobile state of the terminal.
  • the detecting the status of the terminal includes: receiving, by the terminal, a measurement report that the terminal detects the mobile state of the terminal.
  • Ti indicates the time at which the i-cell resides
  • alpha_i indicates a correction factor for the i-cell dwell time, which indicates that different types of cells have different dwell times at the same mobile rate due to different cell radii.
  • the detecting the status of the terminal specifically includes:
  • V c * delta_f / f, where c is the propagation rate of the electromagnetic wave, delta.f is the Doppler shift of the terminal detected by the base station, and f is the carrier center frequency of the cell;
  • the moving speed V is compared with a preset threshold value to obtain a motion state of the terminal.
  • the selecting the target cell according to the cell type and the state of the terminal further includes: determining a motion state of the terminal; when the terminal is in a low speed motion state, directly selecting the target cell, when the terminal is in a medium speed or high speed motion state Determining whether the cell that the terminal can access includes a micro cell or a pico cell; if the micro cell or the pico cell is included, detecting whether the micro cell and the pico cell have the same covered macro cell, if not including the micro cell or the pico cell, The macro cell is used as the target cell; if there is a macro cell that covers the same, it is detected whether the micro cell or the pico cell load is higher than the macro cell load predetermined threshold.
  • the micro cell or the pico cell is selected as the target. If the macro cell load does not reach the preset macro cell load threshold or the macro cell load minus the micro cell load does not reach the preset threshold, the micro cell or the pico cell is not used as the target cell, and if the micro cell or the pico cell is loaded Higher than macro cell load When the threshold is predetermined, the micro cell or the pico cell is selected as the target cell.
  • the reduced measurement offset parameter is set for the target cell.
  • the increased measurement offset parameter is set for the macro cell around the target cell.
  • the present invention also provides a handover control apparatus for a wireless network, the apparatus comprising:
  • a setting unit configured to set a cell type for each cell, and bind the cell type to the cell identifier; and the detecting unit is configured to detect the state of the terminal;
  • a selecting unit configured to select a target cell according to the cell type and a state of the terminal
  • a switching unit configured to set a measurement offset parameter according to a cell type of the target cell and a state of the terminal, to control handover of the terminal to the target cell.
  • the status of the terminal includes a mobile state of the terminal.
  • the detecting unit directly detects a moving state of the terminal.
  • the detecting unit includes a receiving unit and a parsing unit, where the receiving unit is configured to receive the end The measurement report of the end, the parsing unit is configured to parse the measurement report to detect the movement state of the terminal.
  • the present invention combines the state of the terminal (especially the mobile state), the target cell type, and the like to perform handover decision, provides better communication quality guarantee for terminals in different mobile states, reduces handover call drop rate, and improves user perception.
  • FIG. 1 is a flow chart of a handover control method for a wireless network of the present invention
  • FIG. 2 is a block diagram of a handover control apparatus for a wireless network of the present invention
  • FIG. 3 is a flow chart of a handover control method for an eUTRAN network of the present invention.
  • the present invention provides a method for handover control of a wireless network.
  • the method is particularly applicable to a wireless network of a hierarchical network. As shown in FIG. 1, the method includes the following steps:
  • step S1 includes: adding a cell type field to the cell identifier, and using the field to indicate the cell type.
  • step S1 includes: selecting a part of the bits in the cell identifier to indicate the cell type.
  • the cell type includes whether there is cell coverage.
  • the cell type includes a macro cell, a micro cell, a pico cell, an outdoor cell, and/or an indoor cell.
  • the status of the terminal includes a mobile state of the terminal.
  • the moving state includes a high speed motion state, a medium speed motion state, and a low speed motion state.
  • the cell type is set by using an operation and maintenance interface or the cell type is automatically set according to a parameter of the cell by using a software.
  • the step S2 includes: detecting a mobile state of the terminal.
  • the step S2 includes: detecting, by the terminal, the moving state of the terminal, and measuring The report reports the test results.
  • step S2 specifically includes:
  • step S2 specifically includes:
  • the step S3 further includes: S31. determining a motion state of the terminal; S32. directly selecting a target cell when the terminal is in a low-speed motion state, and determining that the terminal is accessible when the terminal is in a medium-speed or high-speed motion state. Whether the cell includes a micro cell or a pico cell; S33. If the micro cell or the pico cell is included, it is detected whether the micro cell and the pico cell have the same covered macro cell, and if the micro cell or the pico cell is not included, the macro cell is used as a target cell; S34.
  • detecting whether the micro cell or the pico cell load is higher than a macro cell load predetermined threshold if there is no macro cell with coverage, the micro cell or the pico cell is selected as the target cell; S35. If the macro cell load does not reach the preset macro cell load threshold or the macro cell load minus the micro cell load does not reach the preset threshold, the micro cell or the pico cell is not used as the target cell, and if the micro cell or the pico cell is loaded Above the macro cell load predetermined threshold, select the micro cell By the pico cell to the target cell.
  • the reduced measurement offset parameter is set for the target cell in step S4.
  • the increased measurement offset parameter is set for the macro cell around the target cell.
  • the present invention further provides a handover control apparatus for a wireless network.
  • the apparatus includes: a setting unit 1 configured to set a cell type for each cell, and bind the cell type to the cell identifier;
  • a detecting unit 2 configured to detect a state of the terminal
  • a selecting unit 3 configured to select a target cell according to the cell type and a state of the terminal;
  • the switching unit 4 is configured to set a measurement offset parameter according to a cell type of the target cell and a state of the terminal, to control handover of the terminal to the target cell.
  • the status of the terminal includes a mobile state of the terminal.
  • the detecting unit directly detects a moving state of the terminal.
  • the detecting unit includes a receiving unit and a parsing unit, where the receiving unit is configured to receive a measurement report of the terminal, and the parsing unit is configured to parse the measurement report to detect a moving state of the terminal.
  • the present invention is applicable to all radio access networks based on any communication standard.
  • the following is an example of an evolved radio access network eUTRAN defined by the 3GPP Long Term Evolution (LTE) project. As shown in FIG. 3, the following mainly includes the following: Steps:
  • Step sr setting a cell type for the wireless cell by operation maintenance or automatic manner, and establishing a binding relationship between the cell type and the cell unique identifier and/or the cell wireless identifier.
  • Setting the cell type for the wireless cell also includes setting whether there is an overlapping coverage relationship for the wireless cell.
  • a cell (cell) concept is used to identify a wireless cell, and a standard plane defines a globally unique identifier (ECGI) and a cell physical identifier (PCI) for each cell. Physical cell identity ).
  • ECGI globally unique identifier
  • PCI cell physical identifier
  • the ECGI consists of MCC (Mobile Country Number), MNC (Mobile Network Number), ENB ID (Enhanced Base Station Node Unit Identifier) and cell ID (Cell ID), which are used to uniquely identify a cell at the network level.
  • MCC Mobile Country Number
  • MNC Mobile Network Number
  • ENB ID Enhanced Base Station Node Unit Identifier
  • Cell ID Cell ID
  • the PCI is used to identify a wireless cell from the radio layer when the terminal performs access, handover, measurement, etc., and it is particularly necessary that the measurement report of the terminal uses the frequency of the current working of the wireless cell and the PCI of the wireless cell to identify And distinguish a wireless cell.
  • the base station After receiving the measurement report of the terminal, the base station addresses the target cell according to the mapping relationship between the PCI and the ECGI stored in advance.
  • the ECGI defined by the standard level cannot identify the cell type. That is to say, the current type and implementation cannot determine the cell type through eCGI.
  • the cell type and the cell type binding relationship are first established, that is, the cell type is set for the cell identified by the cell ECGI and the PCI, and the cell type includes: a macro cell macro cell, a micro cell Area micro cell, pico cell pico cell, outdoor cell outer cell, indoor cell indoor cell and so on.
  • a method for establishing a binding relationship between a cell identifier and a cell type includes adding a cell type of a cell type to the cell identifier, where the cell type is defined as: a macro cell, a micro cell, a micro cell, a pico cell, and an outdoor cell Cell, indoor cell, indoor cell, etc.
  • the method for establishing a binding relationship between a cell identifier and a cell type further includes using a field in an existing ECGI to perform identification.
  • the current ECGI includes a 28-bit ECI, including a 20-bit ENB ID and an 8-bit Local cell ID.
  • the manner of using existing ECGI fields, specifically including The cell type is implicitly identified using n bits of the existing ECGI.
  • Setting the cell type by means of operation and maintenance includes setting the cell type through the operation and maintenance interface.
  • the automatic cell type setting mode includes the software automatically setting the cell type according to the cell transmission power, the coverage of the cell, and the like.
  • Setting a cell type for the wireless cell further includes setting a coverage relationship identifier for the wireless cell, indicating whether a certain wireless cell has an overlapping coverage neighboring cell, for example, setting a neighboring cell of the macro cell with overlapping coverage for the micro cell, and setting the macro cell for the macro cell.
  • Step S2' the detection of the terminal status includes the detection of the mobile state of the terminal by the wireless network and the detection of the state of the terminal by the terminal itself.
  • the terminal status described herein mainly includes the state of the radio channel quality of the terminal, the current mobile state of the terminal, and the like.
  • the detection of the mobile state of the terminal is mainly described in detail.
  • the specific detection method includes the wireless network detecting the mobile state of the terminal with which the RRC (Radio Resource Control) connection is established, and the terminal itself detects the mobile state of the terminal and reports it to the wireless network through the measurement report.
  • RRC Radio Resource Control
  • the detection of the mobile state of the terminal by the wireless network includes the ENB determining the moving rate of the UE according to the history information of the UE recorded and transmitted between the base stations adjacent thereto.
  • the UE history information table as shown in Table 1, includes the maximum 16 cell ECGIs that the terminal has camped on in the connected mode, the cell type, and the dwell time in the cell.
  • Detecting the mobile state of the terminal according to the terminal history information includes: accumulating the d camp time of the terminal that the terminal has recently camped, and dividing the obtained result by n to obtain the average dwell time of each cell, in the process of accumulating Consider the type of cell;
  • the obtained average dwell time T_mea n is compared with a predefined threshold.
  • T_mea n is less than or equal to T_medium (such as 22 seconds) and greater than T_high (such as 13 seconds)
  • T_mean is smaller than T_high (for example, (13 seconds)
  • T_mean is greater than T_medium
  • the terminal is considered to be in a low-speed movement state.
  • the macro cell has a radius of 300 meters and the terminal movement rate is less than 50 kilometers per hour, it is considered that the medium speed is moving, and that the speed is higher than 80 kilometers per hour.
  • the speed is between 50 and 80, the terminal is considered to be in the medium speed moving state, according to the cell.
  • the radius gets a dwell time of 22 seconds and 13 seconds.
  • the base station compares the detected rate V with a predefined rate threshold. When the detected rate V is less than or equal to the medium_speed threshold, the terminal determines that the terminal is in a low speed moving state. When the detected rate v is greater than medium_speed and less than the high_speed threshold, it is determined that the terminal is in the medium speed moving state, and when the detected rate is greater than the highspeed threshold, it is determined that the terminal is in the high speed moving state.
  • Step S3 ' the wireless network determines the target cell that the terminal needs to handover according to the cell type, the mobile state of the terminal, the measurement report of the aggregation terminal, the handover preparation, and the like, and generates a better handover target cell.
  • the terminal When the terminal measures the surrounding neighboring cell and meets the triggering condition of the measurement report, the terminal reports the measurement report to the network, and the base station determines whether the terminal is in the low-speed moving state according to the detection result of step 2, and when the terminal is in the low-speed moving state, according to the normal
  • the target cell selection policy performs target cell selection. That is, the cell type may be selected as a micro cell or a pico cell as a target neighboring cell.
  • the measurement report of the terminal includes the micro cell or the pico cell when the terminal is in the medium speed or the high speed state, it is detected whether the micro cell and the pico cell have the same covered macro cell, and further detects the load of the micro cell and the macro cell. Load relationship,
  • the micro cell load does not reach the preset macro cell load threshold or the macro cell load minus the micro cell load does not reach the preset threshold, and the micro cell has overlapping coverage macro cells, and the terminal is in the medium speed or high speed mobile state.
  • the micro cell or the pico cell is not used as the target cell (ie, the macro cell is selected as the handover target cell). Otherwise, select the micro or pico cell as the target neighbor.
  • Step S4' setting a measurement report and/or a switching threshold according to the terminal moving rate and/or the cell type.
  • the terminal is in the medium speed or high speed moving state, and the target micro area does not have the overlapping coverage adjacent area, when the measurement report trigger condition is set for the terminal or when the handover decision is made, the use is smaller.
  • the offset of the measured value causes the terminal to quickly switch to the target microcell.
  • the normal measurement offset is used.

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

Abstract

La présente invention concerne le domaine technique des communications. Elle porte sur un procédé de commande de commutation pour réseau sans fil, ce procédé comprenant les étapes suivantes : définition d'un type de cellule pour chaque cellule, et affectation du type de cellule à un identifiant de cellule ; détection du statut d'un terminal ; sélection d'une cellule cible en fonction du type de cellule et du statut du terminal ; définition d'un paramètre de correction de valeur pour commander la commutation du terminal vers la cellule cible. Cette invention combine le statut du terminal et le type de cellule cible pour déterminer la commutation, ce qui garantit une bonne qualité de communication entre terminaux se trouvant dans différents états mobiles. Par conséquent, le taux d'abandon d'appels en cours de commutation est réduit et la perception de l'utilisateur améliorée.
PCT/CN2014/085229 2013-09-23 2014-08-26 Procédé et dispositif de commande de commutation pour réseau sans fil WO2015039522A1 (fr)

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CN201310444510.3A CN103476079B (zh) 2013-09-23 2013-09-23 用于无线网络的切换控制方法以及切换控制装置
CN201310444510.3 2013-09-23

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