WO2006017983A1 - Procede de transfert de charge d'un systeme de communication mobile - Google Patents

Procede de transfert de charge d'un systeme de communication mobile Download PDF

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Publication number
WO2006017983A1
WO2006017983A1 PCT/CN2005/001271 CN2005001271W WO2006017983A1 WO 2006017983 A1 WO2006017983 A1 WO 2006017983A1 CN 2005001271 W CN2005001271 W CN 2005001271W WO 2006017983 A1 WO2006017983 A1 WO 2006017983A1
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WO
WIPO (PCT)
Prior art keywords
cell
load switching
communication system
mobile communication
load
Prior art date
Application number
PCT/CN2005/001271
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English (en)
Chinese (zh)
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WO2006017983A8 (fr
Inventor
Jiancheng Du
Original Assignee
Huawei Technologies Co., Ltd.
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.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2006017983A1 publication Critical patent/WO2006017983A1/fr
Publication of WO2006017983A8 publication Critical patent/WO2006017983A8/fr

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Classifications

    • 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 mobile communication technologies, and in particular, to a load switching method for a cross-base station controller in a mobile communication system.
  • handover technology is a key technology to support users' global roaming. It is an important function of WCDMA systems and is unique to cellular systems, directly affecting the performance of the entire system.
  • MS mobile station
  • Switching operations occur frequently during MS communication. For example, when the quality of the call is degraded due to external interference, or because there are too many users in one cell and cannot guarantee the normal use of all users, the current communication service will be switched to the new channel and communication will continue.
  • the communication link between the original base station and the MS will likely be replaced by the communication link between the new base station and the MS.
  • There are several classification methods for switching types There are several classification methods for switching types.
  • the connection establishment and release between MS and network it can be divided into: softer switching, soft switching and hard switching.
  • the reason of switching it can be basically divided into edge switching and load switching.
  • the edge switching is that when the transmission quality is acceptable, if the MS is connected to another cell to the total level, or when the communication quality can be greatly improved, the serving cell of the MS can be changed.
  • the edge switching may be inconsistent with the locally optimized transmission quality, and the edge switching cannot be performed when the transmission quality is not good.
  • the load switching is the traffic switching when a cell is congested and the neighboring cell is idle. This network load-based handover can balance the traffic between cells and prevent cell overload, but must be handled carefully. Because it contradicts the edge switching criteria, because such switching will inevitably disturb the cell planning and increase the interference level in the surrounding area.
  • Both edge switching and load switching are initiated by the base station controller.
  • the efficiency of handover is often closely related to the accuracy of the information of the handover target cell as known by the base station controller.
  • the load switching situation is various.
  • the base station controller must fully understand the current load information of the target cell, no matter what the situation is.
  • the load situation of each cell in the jurisdiction, that is, understanding both the target cell and the load information of the source cell, the load switching algorithm is very simple.
  • the base station controller corresponding to the target cell and the source cell may be located in the same mobile switching center (Mobile Switching Center, called "MSC").
  • MSC Mobile Switching Center
  • cross-MSC in which case it is possible to switch from a WCDMA system to a Global System for Mobile Communication (GSM) system, or conversely, this cross-system load switching algorithm is very complex, resulting in this situation. The load switching under is inefficient.
  • GSM Global System for Mobile Communication
  • the wideband code division multiple access system 10 includes a user 103, which accesses the system through the base station 102, and the base station controller 101 is responsible for controlling the base station 102. And connected to the mobile switching center 100 through the Iu interface 104.
  • the base station controller may also be called a radio network controller (Radio Network Controller, called "RNC"), and the base station may also be called Node B (Node B).
  • RNC Radio Network Controller
  • FIG. 1 Another system in Fig. 1 is a global mobile communication system 11, which includes a user 113, which is connected to the system via a base station 112, which is responsible for controlling the base station 112 and is connected to the mobile switching center 110 via the A interface 114.
  • the base station controller corresponding to the target cell and the source cell is located at two different MSCs, and is switched from the WCDMA system to the GSM system or vice versa. That is, the user 103 in the wideband code division multiple access system 10 needs to switch to the channel in the global mobile communication system 11, or the user 113 in the global mobile communication system 11 needs to switch to the channel in the wideband code division multiple access system 10,
  • the base station controller needs to know the load information of the target cell by the following two methods:
  • the first way the load information is directly transmitted between the base station controllers of the two systems by the newly added Iur-g interface 12 between the base station controller 101 and the base station controller 111; the respective base station controllers know the target The load information of the cell can make a decision on whether to perform load switching.
  • the second mode the cell load information is transmitted to the MSC by the respective base station controller through the A interface or the Iu interface. That is, the base station controller 111 transmits the own cell load information to the mobile switching center 110 through the A interface 114, or the base station controller 101 transmits the own cell load information through the Iu interface 104 to the mobile switching center 100. Finally, the mobile switching center 110 and mobile switching The central office 100 exchanges the cell load information of each other through the corresponding network, and then sends the information to the base station controllers under their respective jurisdictions, and makes a decision on whether or not the load can be switched.
  • the collection, analysis, and processing of the target cell information for the load switching are all performed by the base station controller, so that for the load switching across the base station controller, different base station controllers need to be added.
  • An additional Iur-g interface is used for communication. As the addition or modification of the interface causes changes in many network elements of the access network and the core network, the new interface is re-tested, which is costly and difficult to maintain.
  • the main object of the present invention is to provide a mobile communication system load switching method, so that load switching across a base station controller does not require modification or addition of an interface, and is directly implemented on an existing network device.
  • the present invention provides a mobile communication system load switching method, including:
  • the base station controller sends a load switching request to the mobile switching center.
  • the mobile switching center selects an optimal target cell from a neighbor cell list of the source cell, and determines whether the best target cell can withstand a new load, and if yes, performs from the source cell to the best The load switching of the target cell, otherwise, the load switching request is rejected.
  • the mobile switching center obtains information about all cells in the neighbor cell list of the source cell, obtains the available resource probability according to the information, and selects the cell with the highest probability of available resources as the best target cell;
  • Whether or not the available resource probability of the best target cell exceeds a set threshold determines whether it can withstand a new load.
  • the neighboring cell table of the source cell and the available resources of all cells in the neighbor cell list of the source cell are pre-configured;
  • the method further includes:
  • the mobile switching center queries the neighboring cell list of the source cell according to the received load switching request, and if the random target cell is not included in the neighboring cell table of the source cell, the random port is randomly The target cell is in a neighbor table of the source cell.
  • the method performs load switching from the source cell to the best target cell according to the following steps:
  • the information of the cell includes statistical information and configuration information.
  • the statistics information includes the number of location updates of the cell in the current time period, and the current number of calls of the cell in the current time period, where the configuration information includes the maximum number of calls of the cell in the busy time period, and the available resource probability and location
  • the number of location updates is inversely proportional, and the available resource probability is proportional to the difference between the maximum number of calls minus the number of current calls.
  • the load switching method of the present invention is applicable to load switching between a wideband code division multiple access mobile communication system and a global mobile communication system.
  • the technical solution of the present invention is different from the prior art in that the target cell information processing, selection judgment and the like are directly performed by the MSC to complete the load switching; and the cell is obtained by learning the message from the base station controller on the MSC side.
  • Information The probability of the available resources of the cell is measured by information such as the current number of calls of the cell, the number of location updates, and the maximum number of calls, and the target cell for load handover is selected.
  • the difference in this technical solution brings about a more obvious beneficial effect, that is, since the load switching process is basically completed by the MSC, the communication across the base station controller is avoided, and the cost brought about by adding or modifying the interface is removed;
  • the MSC side automatically acquires cell information for learning RNC messages, which greatly improves the efficiency of load switching, and reduces the load switching operation.
  • the comprehensive statistical information and configuration information are used to more accurately measure the available resource probability of the cell, which is greatly improved. 'The reliability of load switching.
  • FIG. 1 is a schematic diagram of cross-system load switching in the prior art
  • FIG. 2 is a flow chart of a common MSC load handover in accordance with one embodiment of the present invention.
  • the invention directly adopts the MSC to collect, analyze and process the target cell information of the load switching, whereby the MSC completes the target cell load judgment, the target cell selection, and the load switching timing of the load handover, so that different base station controllers or different systems are used.
  • the load switching can be done efficiently and independently of each base station controller.
  • the target cell information in the MSC may be obtained through initial configuration, or may be learned by using a message of a radio network controller (Radio Network Control, called "RC"), thereby reducing the implementation complexity of the load switching.
  • the RNC here may also be referred to as a base station controller.
  • the MSC side calculates the available resource probability of the cell by using the configuration information such as the current number of times of the cell, the number of times of the location update, and the maximum number of calls, so as to determine whether the load switching of the cell is feasible and select the target cell for optimal load handover. , improve the reliability of load switching.
  • the present invention attempts to solve the load switching between the base station controllers by using a single cartridge technology, thereby avoiding major upgrade changes to the existing network.
  • load switching from a WCDMA system to a GSM system.
  • the primary problem to be solved by the present invention is to use some means to let the MSC know the target cell information of the target for load switching.
  • the location update process is a basic function of mobility management, which is defined by the Home Location Register (HLR), MSC/Visitor Location Register (Visitor Location Register).
  • HLR Home Location Register
  • VLR Visitor Location Register
  • the logical cooperation between entities such as "VLR" is completed.
  • the HLR records the current location information of the mobile terminal and all user data;
  • the VLR records relevant user data roaming to the mobile terminal controlled by the VLR;
  • the MSC processes the location registration process of the mobile terminal, talks with the mobile terminal, and interacts with the HLR and the VLR.
  • Location updates include location registration, periodic location registration, user data deletion, and more. It can be seen that there are generally cell-based statistics about location updates in the MSC. Moreover, the mobile terminal performs periodic location update, and records the number of location updates LocUpNum in a period of time T in the MSC, which basically reflects the number of potential users in the cell; and also records the busy period T of each cell. The maximum number of calls within CallNumbusyH, this value can represent the maximum amount of resources available to the cell.
  • this value is a statistical value, which is very useful in network network planning, because network resources are configured according to this value;
  • the current call count CallNumCurrent of the current cell recorded in the MSC can also be utilized, and the value is defined as a period of time before the current time. The number of calls within T. After having the above three values, you can define the resource probability AresPro, which is defined as follows:
  • AResPro ( CallNumbusyH - CallNumCurrent ) /LocUpNum Its meaning is to describe the possibility that a cell will accept a resource request in the current state without causing a cell overload. For example, when CallNumCurrent is large (of course, it is impossible to be greater than CallNumbusyH), it indicates that the cell is very busy within a period of time before the current time, causing AresPro to be small. If the load is switched at this time, it will occupy a relatively tight wireless channel. Resources may cause overload of the community. On the other hand, when CallNumCurrent is small, it indicates that the cell is idle in a period of time before the current time. The result of AresPro calculation is very large.
  • MSC owns AresPro, which is equivalent to understanding the information in the cell under its jurisdiction. For load switching, it is equivalent to having source cell information. In this case, you can define a degree. If AresPro exceeds this degree, you can accept load switching. If you do not, you cannot switch the load.
  • the load switching also needs to know the target cell information, and there are two methods for obtaining the target cell information.
  • the first method is that the number of resources per cell is directly configured to the MSC or the neighbor relation table of the cell is directly configured to the MSC, but the method is It is necessary to make a large number of data configuration groups on the MSC side. The work is cumbersome and error-prone, and if the resources on the access network side change, it should be noted that these changes occur if a certain carrier board fails or a base station loses power.
  • the dynamic channel of the traffic channel (Traffic Channel) and the Stand-alone Dedicated Control Channel (SDCCH) are generated in a certain cell of GSM, and the related protocol interfaces need to be modified to support
  • the access network resource information is dynamically reported to the MSC, which is too expensive as described in the disadvantages of the prior art. Therefore, the present invention does not use this method to obtain target cell information.
  • the second method is adopted by the present invention, that is, the MSC can learn the neighbor information of the cell through learning. This is because although the cell neighboring information is not configured on the MSC side of the general source cell, the MSC has a learning function, that is, the access network initiates the handover every time. The source cell and the target cell information in the request command are extracted and recorded. After a period of learning, the MSC can obtain enough neighbor information, including the frequency of the neighboring cell, the scrambling code, and whether there is a transmit diversity. Wait.
  • This process generally consists of two major parts.
  • the first part is that the source base station controller sends a load switching request to the MSC directly connected thereto, and specifically includes two sub-steps of step 2000 and step 2100.
  • step 2000 when the source base station controller decides to initiate a load handover, although the load condition of the target cell is not known, the blind handover may be performed, that is, only one of the neighboring cell tables is selected as the target cell. .
  • the base station controller sends a load switching request to the MSC;
  • step 2100 the MSC queries the neighbor cell list of the source cell according to the received load handover request. If the random target cell is not included in the neighbor cell list of the source cell, the random target cell is added to the neighbor cell list of the source cell. . This is actually the learning process of MSC.
  • the MSC selects the best target cell from the neighbor cell list of the source cell, and determines whether the best target cell can withstand the new load, and if so, proceeds from the source cell to the best target cell.
  • the load is switched, otherwise, the load switch request is rejected.
  • the MSC of the target cell calculates the AresPro of the current cell, and the MSC obtains the available resource probability of the information of all the cells in the neighbor cell of the source cell, and selects the cell with the highest probability of available resources in the neighbor cell of the source cell.
  • the best target cell there are two options to achieve the above effects:
  • the MSC directly configures the neighbor cell list of the source cell; or directly configures the available resource probability of all cells in the neighbor cell list of the source cell in the MSC; and selects the cell with the highest resource probability in the neighbor cell list of the source cell. For the best target area.
  • the basis of this scheme is the first method of obtaining the target cell information as described above.
  • the neighboring cell list of the source cell is dynamically established in the MSC.
  • the MSC dynamically establishes the neighbor cell list of the source cell by learning the message of the base station controller. Then, the MSC calculates the available resource probability according to the statistical information and configuration information of all the cells in the neighbor cell list of the source cell.
  • the statistics information includes the number of location updates of the cell in the current time period, the current number of calls of the cell in the current time period, and the configuration information includes the maximum number of calls of the cell in the busy time period, and the available resource probability is inversely proportional to the number of location updates.
  • available resource probability and maximum number of calls The difference between the number of current calls minus the number of calls is proportional. That is, the information of all cells in the neighbor list is analyzed according to the calculation formula of AresPro described above. Finally, the cell with the highest probability of available resources in the neighbor cell list of the source cell is selected as the best target cell.
  • step 2300 it is determined whether the value of the cell resource probability in the neighboring cell table is greater than a certain threshold Thresthold, that is, whether the probability of the available resource of the best target cell exceeds a set threshold, and if yes, then Go to step 2400, otherwise go to step 2310.
  • step 2310 since it is determined in step 2300 that the value of the cell resource probability in the neighbor list is the largest than the Threshold, it is not necessary to forward the request to the access network under the target cell MSC. A reject load switching request is sent to the source cell base station controller. The process ends.
  • step 2400 since it is determined in step 2300 that the value of the cell resource probability in the neighbor cell list is greater than the Threshold, the load switching from the source cell to the best target cell is performed; the specific two sub-stages are initially The base station controller of the best target cell sends a handover request; and then sends a load handover command to the source cell base station controller.
  • step 2500 the source cell base station controller issues a handover command to the user equipment. The process ends.

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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 de transfert de charge d'un système de communication mobile, dans lequel le transfert s'effectue au moyen de dispositifs de réseau existants, sans modification de l'interface ou adjonction d'une interface lorsque le transfert s'effectue entre différents BSC. Selon le procédé, le BSC transmet d'abord la demande de transfert de charge au centre de communication mobile (CCM). Le CCM choisit la cellule cible optimale dans le tableau des cellules voisines de la cellule source, et détermine si cette cellule cible peut prendre en charge la nouvelle charge. Si la réponse est affirmative, il démarre le transfert de charge de la cellule source à la cellule cible optimale. Dans le cas contraire, il rejette la demande de transfert de charge.
PCT/CN2005/001271 2004-08-16 2005-08-16 Procede de transfert de charge d'un systeme de communication mobile WO2006017983A1 (fr)

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CN200410053785.5 2004-08-16
CNB2004100537855A CN100373986C (zh) 2004-08-16 2004-08-16 移动通信***负载切换方法

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WO2006017983A8 WO2006017983A8 (fr) 2008-01-10

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CN112492650A (zh) * 2014-07-14 2021-03-12 中兴通讯股份有限公司 资源信息的处理方法及装置

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CN100433658C (zh) * 2006-08-10 2008-11-12 华为技术有限公司 一种实现负载自动重分配的方法及***
CN100551127C (zh) * 2006-09-05 2009-10-14 华为技术有限公司 池区中实现负载迁移的方法及***
CN101026564B (zh) * 2007-02-05 2010-12-08 华为技术有限公司 池区中实现负载迁移的方法及***
CN101217764B (zh) * 2008-01-16 2012-03-07 中兴通讯股份有限公司 优化无线本地环路通信网络的方法及***
EP2353321A4 (fr) * 2008-11-03 2014-08-20 Rockstar Consortium Us Lp Procédé et système de regroupement de communications sans fil pour émission et réception multipoint coordonnées
CN101835136A (zh) * 2009-03-09 2010-09-15 中兴通讯股份有限公司 状态指示方法、核心网以及无线网络控制器
CN102695215B (zh) * 2011-03-22 2015-04-29 华为技术有限公司 发送及接收负载信息的方法、接入网控制节点及***
CN104469865A (zh) * 2014-11-28 2015-03-25 大唐移动通信设备有限公司 一种目标小区配置方法及装置
CN113852513B (zh) * 2020-06-28 2022-11-22 北京市天元网络技术股份有限公司 网络容量预测方法及装置

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CN1738477A (zh) 2006-02-22
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