WO2012075803A1 - Procédé et système de sélection d'une cellule cible pour un transfert - Google Patents

Procédé et système de sélection d'une cellule cible pour un transfert Download PDF

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Publication number
WO2012075803A1
WO2012075803A1 PCT/CN2011/076304 CN2011076304W WO2012075803A1 WO 2012075803 A1 WO2012075803 A1 WO 2012075803A1 CN 2011076304 W CN2011076304 W CN 2011076304W WO 2012075803 A1 WO2012075803 A1 WO 2012075803A1
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WO
WIPO (PCT)
Prior art keywords
cell
handover
resource load
handover candidate
load information
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PCT/CN2011/076304
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English (en)
Chinese (zh)
Inventor
姚海波
陈祥榴
刘友贞
武海燕
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中兴通讯股份有限公司
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Publication of WO2012075803A1 publication Critical patent/WO2012075803A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method and system for selecting a handover target cell. Background technique
  • the 2G and 3G networks coexist in a period of time, which makes the switching between 2G and 3G more frequent. Moreover, when operators are doing 3G networking, they hope that more users will reside on the 3G network, so it is necessary to improve as much as possible.
  • the BSC Base Station Controller
  • the BSC Base Station Controller
  • the 3G cell is configured as a neighboring cell of the 2G cell, and when the BSC selects the 3G handover target cell, the information of the measurement report reported by the UE (User Equipment) is generally only the level value of the 3G neighboring cell. For example, RSCP (Received Signal Code Power) or EC/NO (the ratio of received power and thermal noise of the scrambling code on the CPICH (Common Pilot Channel) of the 3G cell), and then select the power.
  • RSCP Receiveived Signal Code Power
  • EC/NO the ratio of received power and thermal noise of the scrambling code on the CPICH (Common Pilot Channel) of the 3G cell
  • the best-valued 3G cell is used as the handover target cell, but the traffic condition BSC of the cell is unknown.
  • the traffic of the 3G cell may be very busy, and the UE fails to allocate resources due to the handover failure. Therefore, when switching to a neighboring cell, when the level value of the neighboring cell reaches a certain value, the key to determining whether the handover succeeds or not is the resource condition of the neighboring cell, that is, the load condition of the neighboring cell. Condition. Specifically, when the level value of the neighboring area reaches a certain value, the lower the load of the neighboring area, the higher the success rate of switching to the neighboring area.
  • the current BSC selects a 3G handover target cell according to the 3G neighboring cell level value, and does not consider the load condition of the 3G cell, which is not conducive to load balancing of the 3G cell service. Moreover, there may be cases where the handover to the 3G fails due to insufficient 3G resources.
  • the technical problem to be solved by the present invention is to provide a method and system for selecting a handover target cell, which improves the handover success rate and facilitates load balancing of the 3G cell service.
  • the present invention provides a method for selecting a handover target cell, where the method includes:
  • the base station controller selects a handover candidate cell according to the level value of the neighboring cell
  • the resource load information of the handover candidate cell includes:
  • Time-division duplex cell uplink load, downlink load and transmission resource information.
  • the step of selecting a handover target cell from the handover candidate cells according to the resource load information comprises:
  • the handover candidate cell with the smallest resource load is selected as the handover target cell.
  • the step of selecting, as the handover target cell, the handover candidate cell with the smallest resource load among the handover candidate cells remaining after the filtering includes: And sorting the handover candidate cells according to the selected one of the resource load information; or, configuring a weight for each resource load, and calculating a load of each cell according to resource load information of each handover candidate cell and corresponding weights And sorting the handover candidate cells according to the calculation result.
  • the step of selecting a handover candidate cell according to the level value of the neighboring cell comprises: respectively performing a level value of the neighboring cell reported in the N measurement reports of the neighboring cell and a pre-configured handover decision threshold For comparison, if the level value of the neighboring cell reported in the P measurement reports is greater than or equal to the corresponding handover decision threshold, the neighboring cell is determined to be a handover candidate cell, where N, P are positive integers, and PN.
  • the step of acquiring the resource load information of the handover candidate cell comprises: for the multi-mode base station controller, the radio network controller saves the resource load information of each neighboring area to the database in real time, and the base station controller accesses Obtaining, by the database, resource load information of the handover candidate cell;
  • the radio network controller informs the base station controller of the resource load information for each neighbor through the inter-network element message.
  • the present invention also provides a selection system for a handover target cell, which is applied to a base station controller, and the system includes:
  • a handover candidate cell decision unit configured to select a handover candidate cell according to a level value of the neighboring cell
  • a resource load information acquisition unit configured to acquire resource load information of the handover candidate cell
  • a handover target cell selection unit configured to select a handover target cell from the handover candidate cells according to the resource load information.
  • the resource load information obtaining unit is configured to:
  • For frequency division duplex FDD cells obtain uplink interference, downlink power, downlink code resources, CE and transmission resource information;
  • the handover target cell selection unit is set to: Filtering the handover candidate cell according to a pre-configured resource load threshold, and filtering out a handover candidate cell whose resource load information is smaller than the resource load is wider;
  • a handover candidate cell having the smallest resource load is selected as the handover target cell from among the handover candidate cells remaining after the filtering.
  • the handover target cell selection unit is configured to: select, as the handover target cell, a handover candidate cell with the smallest resource load from each of the handover candidate cells remaining after the filtering in the following manner:
  • the handover candidate cell decision unit is configured to set a level of the neighboring cell reported in the N measurement reports of the neighboring cell when the handover candidate cell is selected according to a level value of a neighboring cell The value is compared with the pre-configured handover decision threshold. If the level value of the neighboring cell reported in the P measurement reports is greater than or equal to the corresponding handover decision threshold, the neighboring cell is determined to be a handover candidate cell, where, N , P is a positive integer, and PN.
  • the handover target cell selection unit is configured to acquire resource load information of the handover candidate cell according to the following manner:
  • the radio network controller saves the resource load information of each neighboring area to the database in real time, and the handover target cell selection unit acquires the resource load information of the handover candidate cell by accessing the database;
  • the radio network controller notifies the handover target cell selection unit of the resource load information of each neighbor through the inter-network element message.
  • the present invention provides a method for selecting a 3G handover target cell when a 2G cell switches to a 3G cell, and when selecting a target cell, comprehensively considers the level of the neighboring cell and the cell load condition, and in all neighboring areas satisfying the level requirement, A neighboring cell with the least load is selected as the handover target cell, and the handover fails due to insufficient traffic of the target cell and insufficient radio resources or transmission resources.
  • the target cell selected by the method provided by the present invention can improve the handover to the 3G cell handover. Power, and is conducive to load balancing of 3G cells.
  • FIG. 1 is a schematic flow chart of selecting a 3G handover target cell in a GSM network according to an embodiment of the present invention.
  • embodiments of the present invention provide a selection scheme for handover target cells, and the core idea is that, in a 3G neighboring area that satisfies level requirements and resource requirements, according to 3G
  • the cell load ordering situation selects the neighboring cell with the smallest load as the handover target cell, so as to avoid the handover failure due to insufficient traffic of the target cell and insufficient radio resources or transmission resources.
  • an embodiment of the present invention provides a method for selecting a handover target cell, and specifically adopts the following technical solutions:
  • the base station controller selects a handover candidate cell according to the level value of the neighboring cell
  • the resource load information of the handover candidate cell specifically includes:
  • FDD Frequency Division Duplexing
  • TDD Time Division Duplexing
  • the method specifically includes: Filtering the handover candidate cell according to a pre-configured resource load threshold, and filtering out a handover candidate cell whose resource load information is smaller than the resource load is wider;
  • Each of the handover candidate cells remaining after the filtering is sorted according to the resource load information, and the handover candidate cell with the smallest resource load is selected as the handover target cell.
  • the weights are used to calculate the load of each cell according to the resource load information of each handover candidate cell and the corresponding weight, and sort the handover candidate cells according to the calculation result.
  • the selecting the handover candidate cell according to the level value of the neighboring cell comprises: respectively: respectively, the level value of the neighboring cell reported in the N measurement reports of the neighboring cell and the pre-configured 3G handover decision threshold For comparison, if the level value of the neighboring cell reported in the P measurement reports is greater than or equal to the corresponding 3G handover decision threshold, the neighboring cell is determined to be a handover candidate cell, where N, P are positive integers, and PN.
  • the resource load information of the handover candidate cell is obtained in the following manner: For a multimode base station controller, that is, a RNC (Radio Network Controller) and a BSC co-rack, the RNC will each neighboring cell The resource load information is saved in the database in real time, and the BSC obtains the resource load information of the required 3G cell by accessing the database;
  • a multimode base station controller that is, a RNC (Radio Network Controller) and a BSC co-rack
  • the RNC will each neighboring cell
  • the resource load information is saved in the database in real time, and the BSC obtains the resource load information of the required 3G cell by accessing the database;
  • the RNC notifies the BSC of the resource load information of each neighboring cell through the inter-network element message.
  • the BSC needs to select a 3G handover target cell before initiating the 3G handover procedure.
  • the solution in the embodiment of the present invention is mainly based on the load signal of the neighboring area in the 3G neighboring area where the BSC meets a certain level requirement.
  • the 3G neighboring cell is filtered and sorted, and the 3G neighboring cell with the least load is selected as the target cell of the 2G cell to the 3G handover, and the handover success rate to the 3G cell handover is improved, and the load balancing of the 3G cell is facilitated.
  • FIG. 1 is a schematic flowchart diagram of a method for switching a target cell according to an embodiment of the present invention.
  • a 3G handover target cell is selected.
  • parameters for selecting a 3G handover target cell are configured in the BSC.
  • the configured parameters include a 3G handover decision threshold, and each resource load of the 3G cell is relatively wide and selected. Sorted resource load types, etc.
  • the weight value is configured for each resource load of the 3G cell, and is saved in the background database. It is used to comprehensively measure the load condition of each 3G cell by combining the weights, and select the 3G neighboring area with the smallest resource load as the handover target cell.
  • the method in this embodiment mainly includes the following steps:
  • Step 101 The BSC receives and saves the latest N consecutive measurement report information reported by the BTS (Base Transceiver Station).
  • the measurement report reports the information of the 3G neighboring cells measured by the UEs, and the measurement report information mainly includes: an index value and a corresponding level value of the 3G neighboring cell in the BA (BCCH Allocation LIST, BCCH frequency list) table. .
  • the level value of the 3G neighboring area is the RSCP or EC/NO value of the 3G neighboring area for the FDD neighboring area; and the RSCP value of the 3G neighboring area for the TDD neighboring area.
  • the BSC saves the information of the latest several measurement reports reported by the base station. Preferably, the number of measurement reports saved by the BSC can be configured by the background.
  • the MS will continuously measure the neighbor information and report it to the base station.
  • the base station will measure the neighbor information of the MS through the measurement periodically (usually every 480ms).
  • the BSC receives and saves the BTS report.
  • the N consecutive measurement report information is used to perform the handover decision based on the measurement report information using the 3G handover decision formula.
  • Step 102 Determine whether the measurement report includes a 3G cell, and if yes, perform step 103, otherwise return to step 101;
  • each 3G neighboring cell According to the index value of each 3G neighboring cell that is reported, check whether there is a corresponding 3G neighboring cell in the BA table. If yes, the information of the 3G neighboring cell, such as MCC (Mobile Country Code), MNC (Mobile Network Code, mobile network number), etc. and corresponding to 3G The level value of the neighboring area is saved.
  • MCC Mobile Country Code
  • MNC Mobile Network Code, mobile network number
  • Step 103 Take a 3G cell to perform a handover decision, and if the 3G cell passes the handover decision, it is used as a 3G handover candidate cell;
  • the BSC performs a 3G neighbor handover decision according to the 3G neighboring cell level value in the measurement information, and the BSC performs a handover decision on the level value of the 3G neighboring cell reported in the measurement report and the 3G handover decision threshold configured in the BSC background, and the decision formula is determined. It is: AvRxQualUL(n) > Threshold, where AvRxQualUL(n) is the 3G cell level value, and Threshold is the 3G handover decision threshold configured in the background.
  • the BSC first checks whether there is 3G neighbor information in the saved measurement report. If yes, it performs handover decision according to the 3G handover decision formula, and compares the level value of each 3G neighboring area with the threshold value set in the background. If there are P in the N measurement reports that the level value is greater than the threshold, the 3G neighboring cell satisfies the handover decision condition, and the 3G cell is used as the 3G handover candidate target cell. For the 3G neighboring cell reported in the measurement report, as long as the handover decision is established, it is used as the 3G handover candidate cell.
  • the N and P values in the decision formula can be configured in the background and saved in the background database.
  • Step 104 it is determined whether there is still an unconfirmed 3G cell, and if yes, returns to step 103; otherwise, step 105 is performed;
  • Step 105 the BSC first determines whether there is a 3G handover candidate target cell (that is, whether the 3G handover candidate cell is selected), if not, the current process ends, returning to step 101; otherwise, performing the next step 106;
  • Step 106 Acquire resource load information of each 3G cell in the 3G handover candidate target cell.
  • the BSC acquires the resource load information of the 3G handover candidate cell, and obtains the remaining resource information of the current 3G neighboring cell.
  • the BSC obtains uplink interference, downlink power, downlink code resources, CE (channel unit) and transmission resource information of the FDD cell.
  • the BSC acquires uplink load, downlink load, and transmission resource information of the TDD cell.
  • the load information is used by the BSC to perform filtering processing on the 3G handover candidate cell.
  • the RNC and the BSC can share the database, and the RNC saves the resource load information of each 3G cell to the database in real time.
  • the BSC can obtain the resource load information of the required 3G cell by accessing the database.
  • the RNC informs the BSC of the 3G neighbor resource load information by means of the message between the network elements, that is, the BSC needs a certain 3G neighboring cell.
  • the load information request message is sent to the RNC, and the RNC carries the load information of the cell in the load information request response message.
  • the RNC can periodically send the load information of the 3G cell to the BSC through the load information message, BSC
  • the load information of the received 3G cell is saved in the database.
  • the BSC can directly obtain the load information of the 3G cell.
  • the resource load information of the 3G cell refers to the remaining value or proportion of the current resource of the 3G cell.
  • Step 107 The BSC performs filtering processing on the 3G handover candidate cell according to the resource load information, and firstly takes out a 3G handover candidate cell for filtering processing;
  • Step 108 it is determined whether the extracted 3G handover candidate cell meets the filtering condition, and if yes, step 109 is performed, otherwise, step 110 is directly performed;
  • the BSC filters the 3G handover candidate cell according to the resource load information, and determines whether the resource of the 3G handover candidate cell meets the requirement.
  • the specific method is: the BSC first obtains the threshold of the 3G resource load filtering process from the database; For each 3G handover candidate cell, the following is performed: Comparing the resource load information of the 3G neighboring cell with the threshold value set in the background, if all the resource load information is greater than the threshold, the load of the 3G cell is relatively low, and the 3G cell is relatively low.
  • the cell still serves as the candidate target cell for the 3G handover; otherwise, if the load information of one resource is less than the threshold, the 3G cell is relatively heavy, and the 3G cell is no longer a candidate target cell for the 3G handover, and does not switch to the 3G cell.
  • Step 109 If the filtering condition is not met, the 3G cell is no longer used as a 3G handover candidate cell;
  • Step 110 determining whether there is still a 3G handover candidate cell that is not filtered, if yes, returning to step 8, otherwise, performing step 111;
  • Step 111 determining whether there is a 3G handover candidate cell, if yes, executing step 112, otherwise, returning to step 101;
  • Step 112 the BSC sorts according to the resource load information of the 3G handover candidate target cell, selects the 3G cell with the lowest load as the 3G handover target cell, and performs the next step 113;
  • the BSC first determines whether there is a 3G handover candidate target cell after the filtering operation. If not, the current process ends. Otherwise, the 3G cell sorted resource type identifier is obtained from the background, and the sorted 3G cell resource is determined according to the obtained value.
  • the load information, the resource load information of the 3G cell acquired by the BSC is the remaining value of the 3G cell resource, and is sorted according to the selected resource load information from large to small, and the resource load information is larger, indicating that the resource is more abundant, the 3G The lower the load on the cell.
  • the 3G cell Since there are multiple resource load information of the 3G cell, only one resource can be selected for sorting, and sorted according to the selected resource load. Specifically, it may be determined by the BSC background setting, according to the resource type sorted by the background configuration, which resource is used for sorting, sorting according to the resource load information from large to small, and then selecting the resource load to be the smallest (ie, the resource) The 3G cell with the largest load information value is used as the 3G handover target cell.
  • Step 113 After selecting the 3G handover target cell, the BSC initiates a handover procedure to the 3G cell, sends a Handover Required message to the MSC, and starts to switch to the 3G.
  • the sorting method in step 112 is to select a resource load information to sort according to the value of the background database configuration.
  • the load condition of the 3G cell may be comprehensively considered, that is, each resource load information of the 3G cell is given a weight, and the load of the entire 3G cell is calculated by the weight, according to the calculation.
  • the result is sorted. That is, all the load conditions of the 3G are comprehensively considered for sorting, and each load information of the 3G cell is given different weights, and a key weight can be given a larger weight, and the total value of the cell is calculated by the weight.
  • the resource load value is sorted according to the calculated resource load value.
  • the weight of each resource load of the 3G cell can be configured by the background, and the key resource load that affects the access is configured with a larger weight. Assuming that each resource load of the 3G cell is a corresponding weight, the formula for calculating the total resource load value of the 3G cell is: ⁇ ⁇ Sorts the 3G cells according to the calculated / value.
  • the embodiment of the present invention further provides a selection system for a handover target cell, which is applied to a BSC, and the system mainly includes:
  • the handover candidate cell decision unit is configured to select a handover candidate cell according to the level value of the neighboring cell;
  • the resource load information acquiring unit is configured to acquire resource load information of the handover candidate cell, and the handover target cell selection unit is configured to select a handover target cell from the handover candidate cells according to the resource load information.
  • the resource load information of the handover candidate cell acquired by the resource load information acquiring unit specifically includes:
  • Uplink interference, downlink power, downlink code resources, CE and transmission resource information of the FDD cell uplink load, downlink load and transmission resource information of the TDD cell.
  • the handover target cell selection unit is further configured to: when selecting a handover target cell from the handover candidate cells according to the resource load information,
  • Each of the handover candidate cells remaining after the filtering is sorted according to the resource load information, and the handover candidate cell with the smallest resource load is selected as the handover target cell.
  • the handover target cell selection unit is further configured to: when sorting each of the handover candidate cells remaining after the filtering,
  • the handover candidate cell decision unit is configured to: when the handover candidate cell is selected according to the level value of the neighboring cell, respectively, the level value of the neighboring cell reported in the N measurement reports of the neighboring cell Comparing with the pre-configured handover decision threshold, if the level value of the neighboring cell reported in the P measurement reports is greater than or equal to the corresponding handover decision threshold, the neighboring cell is determined to be a handover candidate cell, where, P is a positive integer, and PN.
  • the handover target cell selection unit is configured to acquire resource load information of the handover candidate cell according to the following manner:
  • the radio network controller will real-time resource load information for each neighborhood Saving to the database, the handover target cell selection unit acquires resource load information of the handover candidate cell by accessing a database;
  • the radio network controller notifies the handover target cell selection unit of the resource load information of each neighbor through the inter-network element message.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any particular combination of hardware and software.
  • the present invention provides a method and system for selecting a handover target cell, which improves handover success rate and is advantageous for load balancing of 3G cell services.
  • the level of the neighboring cell and the cell load are considered comprehensively. In all neighboring areas that meet the level requirement, a neighboring cell with the least load is selected as the handover target cell to avoid excessive traffic of the target cell. The switch failed due to insufficient radio resources or transmission resources.

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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 un procédé et un système pour sélectionner une cellule cible pour un transfert, ce procédé comprenant les étapes suivantes : sélection, par une station de base, de cellules candidates pour un transfert sur la base des valeurs des niveaux de puissance des cellules voisines; acquisition d'informations concernant les charges des ressources des cellules candidates pour le transfert; et sélection parmi les cellules candidates d'une cellule cible pour le transfert en vue d'un transfert, sur la base des informations acquises concernant les charges des ressources. Lors d'un transfert d'une cellule 2G à une cellule 3G, ce procédé permet de prendre en compte de manière globale les niveaux de puissance et la charge des cellules voisines, la cellule présentant la charge minimale parmi toutes les cellules voisines et répondant aux exigences de niveau de puissance étant sélectionnée comme cellule cible pour le transfert, ce qui augmente le taux de succès du transfert et facilite l'équilibrage des charges dans les cellules 3G.
PCT/CN2011/076304 2010-12-08 2011-06-24 Procédé et système de sélection d'une cellule cible pour un transfert WO2012075803A1 (fr)

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CN103997763B (zh) * 2013-02-20 2017-11-21 中国移动通信集团公司 一种小区切换方法以及一种基站控制器
CN105722153B (zh) * 2014-08-15 2022-02-18 阿尔卡特朗讯 用于ce-mtc ue的小区重选方法
CN104486781A (zh) * 2014-12-05 2015-04-01 京信通信系统（中国）有限公司 一种lte下集中式切换优化的方法和装置
CN113365316B (zh) * 2020-03-05 2022-08-12 中国移动通信集团吉林有限公司 一种异系统邻区选择方法、装置、计算机设备和存储介质
CN113490246B (zh) * 2021-07-05 2023-03-31 北京邮电大学 一种融合网络的切换控制方法及切换控制装置

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US20220210709A1 (en) * 2020-12-31 2022-06-30 Sterlite Technologies Limited Method and apparatus for initiating handover (ho) procedure in an open-radio access network (o-ran) environment

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