WO2006005224A1 - Procede d'equilibrage de charge d'un reseau local sans fil - Google Patents

Procede d'equilibrage de charge d'un reseau local sans fil Download PDF

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Publication number
WO2006005224A1
WO2006005224A1 PCT/CN2004/000783 CN2004000783W WO2006005224A1 WO 2006005224 A1 WO2006005224 A1 WO 2006005224A1 CN 2004000783 W CN2004000783 W CN 2004000783W WO 2006005224 A1 WO2006005224 A1 WO 2006005224A1
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WO
WIPO (PCT)
Prior art keywords
load
load balancing
access point
level
information
Prior art date
Application number
PCT/CN2004/000783
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English (en)
French (fr)
Inventor
Yin Gao
Bo Sun
Shaohua Wu
Fengguo Ma
Feng Li
Original Assignee
Zte Corporation
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to PCT/CN2004/000783 priority Critical patent/WO2006005224A1/zh
Priority to RU2007105873/09A priority patent/RU2382527C2/ru
Priority to BRPI0418950-7A priority patent/BRPI0418950B1/pt
Priority to CNB2004800435099A priority patent/CN100446581C/zh
Publication of WO2006005224A1 publication Critical patent/WO2006005224A1/zh
Priority to US11/622,863 priority patent/US7940731B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/06—Access restriction performed under specific conditions based on traffic conditions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/30—Circuit design
    • G06F30/32—Circuit design at the digital level
    • G06F30/33—Design verification, e.g. functional simulation or model checking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/086—Load balancing or load distribution among access entities
    • H04W28/0861—Load balancing or load distribution among access entities between base stations
    • H04W28/0862—Load balancing or load distribution among access entities between base stations of same hierarchy level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a wireless local area network system in the field of communications, and more particularly to a method for implementing a load balancing system in a wireless local area network. Background technique
  • the 802.11 standard is a physical layer and media access control (MAC) protocol standard developed by the IEEE 802.i l Wireless Local Area Network Standards Working Group to facilitate the establishment of interoperable network devices by wireless LAN and wireless device manufacturers.
  • the physical layer defines the signal characteristics and modulation of the data transmission.
  • the Media Access Control (MAC) layer can be thought of as consisting of a series of services that can perform such things as information exchange, power control, association management, synchronization management, and process management.
  • WLAN Wireless Local Area Network
  • an extended service group system consists of one or more basic service groups and a distribution system that connects these basic service groups, each of which contains at least one wireless access point device.
  • the extended service group is distinguished by the ESSID (Extended Service Group Identifier), which is distinguished by the BSSID (Basic Service Group Identifier).
  • the site scans the channel to obtain the extended service group and basic service group information in the WLAN environment, and chooses to join a suitable basic service group.
  • Load balancing in WLAN is a wireless LAN system in which multiple access points provide access services for multiple mobile stations.
  • Each access point member uses site information to manage the site, allowing or denying mobile site access.
  • the distribution of load-balanced access points is required to satisfy that when an access point denies site access due to overload, the station can selectively access other access points with lower load, and the access points satisfying the above conditions are divided.
  • the station Within a group called a load group, the station must selectively access the access point within the load group that is relatively low-loaded and relatively best suited for access by the site.
  • the current WLAN protocol does not specify how to perform load balancing processing and how load balancing information interacts within the network.
  • a common implementation method is to collect and manage network load balancing information through an information exchange protocol between access points.
  • the load balancing information is in the network. When broadcasting, it brings a lot of extra overhead to the network, and the singularity of load balancing information makes the site access quality not high, which is not conducive to Optimized management of the entire network.
  • an optimized and efficient load balancing system is beneficial to the improvement of network communication quality.
  • the object of the present invention is to provide a method for implementing a load balancing system in a wireless local area network, improve reliability of network load balancing information, and reduce blind broadcast of load information in a wireless local area network, thereby reducing overhead of wireless network load balancing management, especially in
  • the self-organizing selection of the load balancing agent center can effectively utilize network resources to implement more reasonable and effective management of dynamic load balancing information, reduce dependence on upper-level servers, and improve network load management. flexible.
  • the present invention divides the load information into the following categories - (1) Static load information: Usually determined by the access point's own system resources. For example: CPU frequency, memory size, network connectivity, this information determines the maximum load a single access point can withstand.
  • Statistical load information is extracted from historical performance data. For example: delay and bandwidth. This type of information reflects the typical capacity of access points and network connections. Especially when optimizing the classification service under the QoS (Quality of Service) requirements, it is especially important.
  • Dynamic information usually refers to the network real-time load level information, which is sent when the current load level of each member in the load balancing group changes.
  • the first two kinds of load information can be acquired and stored by the access point itself, and the latter type of load information is collected and saved by the load balancing agent center.
  • the access point accepts or rejects the access of the site according to its own load information and the load information from the load balancing agent center according to a certain equalization optimization strategy.
  • the method of the invention mainly comprises the following steps:
  • Step 1 The load balancing group in the WLAN is initialized, and an access point is automatically selected as a load balancing agent center in the online access point in the load balancing group;
  • Step 2 Each access point in the load balancing group performs load balancing management and processing according to the load optimization level according to the load level, and implements network load balancing.
  • the current online access point selects an access point as a load balancing agent center through the inter-device information exchange according to the load level, and usually the current load level is the most Light access points act as a load balancing agent center. Only when the load level of the load balancing agent center exceeds the agent center threshold (defined as the maximum load level that a load balancing agent center can withstand), then another self-organization is selected in the load balancing group to select another access point as The load balancing agent center, the load balancing agent center can be changed. After the load balancing agent center is selected, other access points in the load balancing group act as non-load balancing agent centers.
  • the agent center threshold defined as the maximum load level that a load balancing agent center can withstand
  • the load balancing agent center In a load balancing group, only the load balancing agent center needs to record the load information of the access points of other non-load balancing agent centers in the same load balancing group.
  • the access point of the non-load balancing agent center only needs to know the load balancing agent center. s position.
  • the load information is reported to the load balancing agent center.
  • the network load information of the current load balancing group can be obtained from the load balancing agent center, and the load balancing management method is combined with the load balancing information stored on the machine.
  • the load balancing agent center is only used as a dynamic information distribution center. The specific load balancing process is performed by the non-load balancing agent center according to the load balancing agent center load balancing information and the local load balancing information.
  • Load balancing agent center processing algorithm and non-load balancing agent center processing algorithm A threshold strategy is adopted, that is, each access point has its own load upper limit MAX and a load lower limit MIN. When the load level of the access point is lower than the load lower limit MIN, it is a light load, allowing site access, and not transmitting the load. Change information, which can reduce the load information interaction in the network and reduce the load balancing overhead of the WLAN network. When the load level of the access point is between the load upper limit MAX and the load lower limit MIN, the normal operation is performed. The point sends dynamic load information to the load balancing agent center once the load level changes; when the load level of the access point exceeds the load limit, it is heavy load and rejects the site access.
  • the method for implementing a load balancing system in a wireless local area network includes the following steps:
  • Step 1 The load balancing group in the WLAN is initialized, and an access point is automatically selected as a load balancing agent center in the online access point in the load balancing group;
  • Step 2 Each access point in the load balancing group performs load balancing management and processing according to the load optimization level according to the load level, and implements network load balancing.
  • the method implemented by the load balancing system in the wireless local area network in the network operation of the wireless local area network, when the load level of the load balancing agent center exceeds the agent center threshold, then the load is Within the balance group, another access point is self-organized according to the load level through the information interaction between the devices as a new load balancing agent center.
  • the method for implementing the load balancing system in the WLAN in step 1, is to use the access point with the lightest current load level in the load balancing group as the load balancing center, and after selecting the load balancing agent center, The other access points in the load balancing group act as non-load balancing agent centers.
  • step 2 only the load balancing agent center needs to record the load information of the access points of other non-load balancing agent centers in the same load balancing group, instead of load balancing.
  • the access point of the agent center only needs to know the location of the load balancing agent center.
  • the load information is reported to the load balancing agent center, and
  • the load balancing agent center obtains the network load information of the current load balancing group, and performs load balancing management according to the load balancing information stored on the local device of the access point of the non-load balancing agent center.
  • each access point including an access point of a load balancing agent center and a non-load balancing agent center, adopts a threshold policy to set respective load upper limits MAX.
  • load lower limit MIN load balancing management and processing, the strategy is as follows: °
  • the load level of the access point When the load level of the access point is lower than the load lower limit MIN, it is in a light load state, allowing the site to access, and does not send load change information;
  • the load level of the access point When the load level of the access point is between the load upper limit MAX and the load lower limit MIN, it is in a normal running load state, allowing site access, and when the access point load level changes, to the load balancing agent
  • the center sends dynamic load change information
  • the load level of the access point When the load level of the access point is higher than the load upper limit MAX, it is in a heavy load state and refuses site access.
  • the method implemented by the load balancing system in the WLAN, the processing of the load balancing agent center includes the following steps:
  • the agent center threshold If the latest load level of the machine exceeds the agent center threshold, communicate with the online access point in the current load balancing group, and select another suitable access point as the new load balancing agent center according to the load level, and will be in the local machine.
  • the stored load balancing information is transferred to the new load balancing agent center, and the address of the new load balancing agent center of other access points in the load balancing group is notified.
  • the method implemented by the load balancing system in the WLAN, the processing of the non-load balancing agent center includes the following steps:
  • the load level processing is performed according to the current load level, and the load level record is updated on the non-load balancing agent center access point local;
  • the load information of the load balancing group is obtained from the load balancing agent center, and the load leveling algorithm is used to perform load level processing in combination with the local load information;
  • the local load level is updated
  • the local load balancing level information is sent to the load balancing agent center, and the local load level is updated.
  • the method for implementing the load balancing system in the wireless local area network further includes a step of classifying the load information into - static load information, which is obtained and stored by the access point's own system resources, including the frequency of the CPU and the size of the memory. , the ability to connect to the network;
  • the statistical load information is obtained and stored by the historical performance data of the access point's own system, including delay and bandwidth;
  • Dynamic load information collected and saved by the load balancing agent center, including network real-time load level information.
  • the method implemented by the load balancing system in the wireless local area network if only one access point village exists in a load balancing group, the access point acts as a load balancing agent center.
  • the method implemented by the load balancing system in the wireless local area network, for moving in a load balancing group The station is an access point in the load balancing group that has a relatively low selective load and is relatively suitable for accessing the site.
  • an access point denies the site access due to excessive load, the site It can smoothly access other access points in the same load balancing group with relatively low load.
  • 1 is a schematic structural diagram of a wireless local area network load balancing group
  • FIG. 2 is a schematic diagram of implementation of a load balancing system in a load balancing group of a wireless local area network according to the present invention
  • FIG. 3 is a flowchart of processing of a load balancing agent center according to the present invention.
  • FIG. 4 is a flow chart of the processing of the non-load balancing agent center according to the present invention. The best way to implement the invention
  • FIG. 1 is a schematic structural diagram of a wireless local area network load balancing group.
  • All APs Access Points
  • the distributed system 101 divides all APs into a plurality of load balancing groups 102 to 104 according to the conditions of the access point and the wireless local area network.
  • the station can selectively access the load balancing group.
  • the packets are manually displayed in the configuration information of the access point. If only one AP exists in a load balancing group, the AP acts as a load balancing agent center.
  • the access point 111 in the figure.
  • each AP can access one or more STAs.
  • the load level of the AP determines whether the next station requesting access to the AP can access.
  • the load level of the AP is determined by the load information stored by itself and the dynamic load information in the network.
  • the load balancing group of the ⁇ can be determined by marking, and the load balancing configuration of the WLAN can be modified during the running of the WLAN network.
  • FIG. 2 is a schematic diagram of the implementation of a load balancing system in a load balancing group of a wireless local area network according to the present invention.
  • a load balancing group 201 is recorded as G1, and an access point ( ⁇ ) 202-204 assigned to the load balancing group G1 is loaded by its own load balancing information and WLAN network running time.
  • the dynamic load balancing information obtained by the device private protocol interaction is determined.
  • the access points 202 to 204 perform information exchange and self-organization through the private protocol between the devices to select a AP with the lightest load level as the load balancing agent center, for example, the access point 202, and establish the current load on the AP.
  • the load information table of the online AP device of the equalization group defines the state as light load, normal operation, reload, saves, and updates the load information table according to the uplink and downlink and load information sent by the access point device.
  • the access point 202 204 re-informs the information to self-organize a new load balancing agent center according to the load level, such as the access point 203.
  • the access point 202 transmits the maintained load information table to the access point 203 while transmitting a broadcast message within the load balancing group to inform the address of the new load balancing agent center.
  • the stations (STA) 205 ⁇ 207 are connected to the load balancing group G1.
  • the STA must selectively access the access point within the load group that is relatively low-loaded and relatively best suited for access by the site.
  • G1 when an AP refuses access to a STA at a certain site due to excessive load level, the STA of the station can successfully access other relatively low-cost access points in the same load balancing group.
  • FIG. 3 is a flow chart of the load balancing agent center processing according to the present invention.
  • Step 301 the AP is selected as a load balancing agent center. If the load balancing group is initialized, a new load information table is established. If the WLAN network is running, the load information table is inherited from the old load balancing agent center. The table contains load information for other online APs in the device.
  • Step 302 Listen and receive the load information sent by other APs in the load balancing group in the WLAN network.
  • Step 303 save the received load information, and update the load information table to send the load information.
  • Step 304 Detect the load level of the AP, perform load level processing according to the network load information recorded in the load information table, and update the load level of the AP.
  • the site access processing is performed according to the current load level. If the load level is less than the load level upper limit, the station STA is allowed to access. If the load level is equal to or greater than the load level upper limit, the station STA access is rejected.
  • Step 305 If the latest load level is less than the load agent upper limit, go to step 302; if the latest load level is equal to or greater than the load agent upper limit, go to step 306.
  • Step 306 Sending a broadcast message to the load balancing group requires selecting a new load balancing agent center, and selecting the AP with the lowest load level as the load balancing agent center, and handing over the load information table to the new load balancing agent center.
  • Step 307 Send a broadcast message to the load balancing group to notify other APs of the address of the new load balancing agent center.
  • FIG. 4 is a flow chart of the processing of the non-load balancing agent center according to the present invention.
  • Step 401 Detect the local load level of the AP.
  • Step 402 If the latest load level is less than the lower limit of the load level, go to step 406; if the latest load level is equal to or greater than the lower limit of the load level, go to step 403.
  • Step 403 Obtain network load information from the load balancing agent center, and perform load level processing in combination with the local load information.
  • Step 404 If the latest load level after processing is less than the lower limit of the load level, go to step 406; if the latest load level after processing is equal to or greater than the lower limit of the load level, go to step 405.
  • Step 405 Send the load level information of the AP to the load balancing agent center.
  • Step 406 update and save the load level information of the AP.
  • the site access processing is performed according to the current load level. If the load level is less than the load level upper limit, the station STA is allowed to access. If the load water is equal to the load level upper limit, the station STA access is rejected.
  • the method of the present invention defines a more comprehensive load balancing information, which helps to achieve more complete load balancing management, implements a WLAN load balancing system by self-organizing a load balancing agent center, and fully utilizes idle resources in the entire network to reduce
  • the additional overhead brought by the load balancing information to the network communication helps to improve the optimization of the entire network resource.
  • the load balancing agent center can reduce the dependency on the upper-level server, and the network load management is more reasonable.

Description

一种无线局域网中负载均衡系统实现的方法
技术领域
本发明涉及通信领域中的无线局域网系统，尤其涉及无线局域网中负载均 衡系统实现的方法。 背景技术
ANSI/IEEE Std 802.11， 1999 Edition 802.11标准是 IEEE802.i l无线局域 网标准工作组制定的物理层和媒体访问控制 (MAC)协议标准，便于无线局域网 及无线设备制造商建立互操作网络设备。物理层定义了数据传输的信号特征和 调制。媒体访问控制 (MAC)层可视为由一系列可完成诸如信息交换、功率控制、 关联管理、 同步管理和过程管理的服务组成。
WLAN (无线局域网)是指应用无线通信技术将计算机设备互联起来， 构成 可以互相通信和实现资源共享的网络体系。 在 WLAN网络环境中， 一个扩展 服务组系统由一个或多个基本服务组，以及联接这些基本服务组的分布系统构 成，每个基本服务组最少包含一个无线接入点设备。扩展服务组通过 ESSID (扩 展服务组识别号)来区分， 无线接入点通过 BSSID (基本服务组识别号)来区分。 站点通过扫描信道， 获取所处 WLAN环境中扩展服务组和基本服务组信息， 并选择加入一个合适的基本服务组。 WLAN 中负载均衡就是由多个接入点为 多种移动站点提供接入服务的无线局域网系统，每一个接入点成员通过利用网 络信息进行站点管理， 允许或拒绝移动站点接入， 达到均勾承担网络负载， 充 分利用网络现有资源，减少网络阻塞目的的一种策略。通常参与负载均衡接入 点的分布要满足当某个接入点由于超载拒绝站点接入时，该站点可以选择性接 入其他负载较低的接入点，满足上述条件的接入点被划分在一个称为负载群组 的组内，站点必须在负载群组内选择性接入负载相对较低并且相对最适合该站 点接入的接入点。
目前的无线局域网协议没有规定如何进行负载均衡处理，以及负载均衡信 息如何在网络内进行交互，常见的实现方法是通过接入点间信息交互协议搜集 管理网络负载均衡信息，负载均衡信息在网络中进行广播的时候给网络带来了 大量的额外开销，而且负载均衡信息的单一性使得站点接入质量不高，不利于 整个网络的优化管理。 对于一个进行接入和资源优化的 WLAN网络而言， 实 现优化高效的负载均衡系统有利于网络通信质量的提高。 发明公开
本发明的目的在于提出一种无线局域网中负载均衡系统实现的方法，提高 网络负载均衡信息的可靠性，减少无线局域网中负载信息的盲目广播， 从而减 少无线网络负载均衡管理额外开销，尤其是在存在三层交换设备的网络中， 负 载均衡代理中心的自组织选择可有效利用网络资源，实现对动态负载均衡信息 进行更加合理有效的管理，减少对上一级服务器的依赖性， 网络负载管理更灵 活。
为实现上述发明目的， 本发明将负载信息分成以下几类- ( 1 )静态负载信息： 通常由接入点自身系统资源决定。 比如： CPU的频 率、 内存的大小、 网络联接的能力， 这些信息决定了单个接入点所能承受的最 大负载。
(2) 统计负载信息： 统计类信息是从历史的性能数据中提取得到的。 比 如： 延迟和带宽。 这类信息反应接入点和网络联接的典型容量。 尤其是在 QoS (服务质量)要求下对分类业务进行优化管理时尤为重要。
(3 ) 动态负载信息： 动态的信息通常是指网络实时负载水平信息， 当负 载均衡组内各个成员的当前负载水平发生变化时就会发送这类的信息。
前两种负载信息可由接入点自身获取并存储，而后一种负载信息则是由负 载均衡代理中心搜集并保存。
接入点根据自身的负载信息和从负载均衡代理中心的到的负载信息，按照 某种均衡优化策略， 接受或拒绝站点的接入。
本发明的方法主要包括如下步骤：
步骤一， 无线局域网中的负载均衡组初始化，在所述负载均衡组中的在线 接入点中自组织选择一个接入点作为负载均衡代理中心；
步骤二，所述负载均衡组内的每一个接入点根据其负载水平，按照均衡优 化策略， 进行负载均衡的管理和处理， 实现网络负载均衡。
在负载均衡组初始化阶段，当前在线的接入点根据负载水平通过设备间信 息交互自组织选择一个接入点作为负载均衡代理中心，通常将当前负载水平最 轻的接入点作为负载均衡代理中心。只有当该负载均衡代理中心的负载水平超 过代理中心门限 (定义为一个负载均衡代理中心所能承受的最大负载水平)， 则 在该负载均衡组内再进行一次自组织选择另一个接入点作为负载均衡代理中 心， 负载均衡代理中心是可以变化的。在选定负载均衡代理中心后， 负载均衡 组中其它接入点则作为非负载均衡代理中心。
在一个负载均衡组中，仅负载均衡代理中心需要记录同一负载均衡组中其 它非负载均衡代理中心的接入点的负载信息，而非负载均衡代理中心的接入点 只需要知道负载均衡代理中心的位置。当非负载均衡代理中心的接入点负载发 生变化时，将负载信息向负载均衡代理中心汇报。 同时可从负载均衡代理中心 获取当前负载均衡组的网络负载信息，结合本机上存储的负载均衡信息进行负 载均衡管理的方法。负载均衡代理中心仅作为动态信息集散地， 具体的负载均 衡处理由非负载均衡代理中心根据负载均衡代理中心的负载均衡信息和本机 负载均衡信息来进行。
WLAN负载均衡系统处理过程：
负载均衡代理中心处理算法和非负载均衡代理中心处理算法。采用门限策 略， 即每个接入点有各自的负载上限 MAX和负载下限 MIN， 当该接入点的负 载水平低于负载下限 MIN时， 则为轻负载， 允许站点接入， 并且不发送负载 变化信息， 这样可以减少网络中的负载信息交互， 减轻 WLAN网络的负载均 衡开销； 当该接入点的负载水平介于负载上限 MAX和负载下限 MIN之间时， 则为正常工作，该接入点一旦负载水平发生变化即向负载均衡代理中心发送动 态负载信息； 当该接入点的负载水平超过负载上限， 则为重负载， 拒绝站点接 入。
具体的，本发明提出的一种无线局域网中负载均衡系统实现的方法， 包括 如下步骤：
步骤一，无线局域网中的负载均衡组初始化，在所述负载均衡组中的在线 接入点中自组织选择一个接入点作为负载均衡代理中心；
步骤二，所述负载均衡组内的每一个接入点根据其负载水平，按照均衡优 化策略， 进行负载均衡的管理和处理， 实现网络负载均衡。
所述的无线局域网中负载均衡系统实现的方法，在无线局域网的网络运行 中， 当所述负载均衡代理中心的负载水平超过代理中心门限，则在所述负载均 衡组内，通过设备间的信息交互根据负载水平自组织选择出另一个接入点作为 新的负载均衡代理中心。
所述的无线局域网中负载均衡系统实现的方法，在步骤一中， 是将所述负 载均衡组内当前负载水平最轻的接入点作为负载均衡中心，并在选定负载均衡 代理中心后， 所述负载均衡组中其他接入点则作为非负载均衡代理中心。
所述的无线局域网中负载均衡系统实现的方法，在步骤二中，仅所述负载 均衡代理中心需要记录同一负载均衡组中其他非负载均衡代理中心的接入点 的负载信息，而非负载均衡代理中心的接入点只需要知道所述负载均衡代理中 心的位置， 当非负载均衡代理中心的接入点的负载发生变化时，将负载信息向 所述负载均衡代理中心汇报，同时可从所述负载均衡代理中心获取当前负载均 衡组的网络负载信息，结合该非负载均衡代理中心的接入点的本机上存储的负 载均衡信息进行负载均衡管理。
所述的无线局域网中负载均衡系统实现的方法，在步骤二中，每个接入点， 包括负载均衡代理中心和非负载均衡代理中心的接入点，采用门限策略， 设置 各自的负载上限 MAX和负载下限 MIN，进行负载均衡的管理和处理，其策略 如下： °
当该接入点的负载水平低于负载下限 MIN时， 处于轻负载状态， 允许站 点接入， 并且不发送负载变化信息；
当该接入点的负载水平介于负载上限 MAX和负载下限 MIN之间时， 处 于正常运行负载状态， 允许站点接入， 并且当该接入点负载水平发生变化时， 向所述负载均衡代理中心发送动态负载变化信息；
当该接入点的负载水平高于负载上限 MAX时， 处于重负载状态， 拒绝站 点接入。
所述的无线局域网中负载均衡系统实现的方法，所述负载均衡代理中心的 处理过程包括如下步骤：
建立或继承所述负载均衡组所有在线接入点的负载信息表；
侦听所述负载均衡组内当前在线其他非负载均衡代理中心接入点的负载 信息， 接收并保存；
检测所述负载均衡代理中心接入点本机的负载水平，结合所述负载信息表 的网络负载信息进行负载水平处理并更新所述负载均衡代理中心接入点本机 的负载水平；
若本机的最新负载水平小于代理中心门限，则继续侦听并接收所述负载均 衡组内当前在线其他非负载均衡代理中心接入点的负载信息；
若本机的最新负载水平超过代理中心门限，则与当前负载均衡组内在线接 入点沟通，根据负载水平自组织选择另一个合适接入点作为新的负载均衡代理 中心， 并将在本机上存储的负载均衡信息转移到新的负载均衡代理中心， 同时 通知负载均衡组内其它接入点新的负载均衡代理中心的地址。
所述的无线局域网中负载均衡系统实现的方法，所述非负载均衡代理中心 的处理过程包括如下步骤：
检测所述非负载均衡代理中心接入点本机的负载水平；
若当前负载水平低于负载下限 MIN， 则根据当前负载水平进行负载水平 处理， 在所述非负载均衡代理中心接入点本机上更新负载水平记录；
若当前负载水平超过负载水平下限 MIN， 则从负载均衡代理中心获取负 载均衡组的负载信息， 结合本地负载信息利用负载均衡算法进行负载水平处 理；
若处理后所述非负载均衡代理中心的最新负载水平低于负载水平下限 MIN, 则更新本机负载水平；
若处理后最新负载水平超过负载水平下限 MIN， 则向所述负载均衡代理 中心发送本机负载均衡水平信息， 并更新本机负载水平。
所述的无线局域网中负载均衡系统实现的方法，还包括一步骤，对负载信 息进行分类， 分为- 静态负载信息， 由接入点自身系统资源获取并存储， 包括 CPU的频率、 内存的大小、 网络连接的能力；
统计负载信息， 由接入点自身系统的历史的性能数据中获取并存储，包括 延迟和带宽；
动态负载信息， 由负载均衡代理中心搜集并保存，包括网络实时负载水平 信息。
所述的无线局域网中负载均衡系统实现的方法，在一个负载均衡组中如果 只有一个接入点村存在， 则该接入点作为负载均衡代理中心。
所述的无线局域网中负载均衡系统实现的方法，对于负载均衡组中的移动 站点，是在所述负载均衡组内选择性接入负载相对较低并且相对最适合该站点 接入的接入点， 当一个接入点由于负载过重而拒绝该站点接入时， 该站点可顺 利接入同一负载均衡组中其他负载相对较低的接入点。 附图简要说明
图 1是无线局域网负载均衡组的结构示意图；
图 2 是本发明所述的无线局域网某个负载均衡组内负载均衡系统实现示 意图；
图 3是本发明所述的负载均衡代理中心处理流程图；
图 4是本发明所述的非负载均衡代理中心处理流程图。 实现本发明的最佳方式
下面结合附图和实施例对本发明做进一步详细说明。
图 1是无线局域网负载均衡组的结构示意图。
整个分布式系统 101的所有 AP(Access Point, 接入点)通过骨干网络互相 通信。 该分布式系统 101按照接入点及无线局域网的情况， 将所有 AP分成若 干个负载均衡组 102〜104， 当某个 AP由于超载拒绝站点接入时，该站点可以 选择性接入负载均衡组内其他负载较低的 AP， 分组通过人工方式体现在接入 点的配置信息中。 在一个负载均衡组中如果只有一个 AP存在， 则该 AP就作 为负载均衡代理中心。 如图中的接入点 111。
分配到负载均衡组中的 AP105〜111， 每一个 AP可接入一个或多个站点 STA。 AP的负载水平决定下一个请求接入该 AP的站点能否接入 ,ΑΡ的负载水 平是由自身存储的负载信息和网络中动态的负载信息决定。在 ΑΡ的配置信息 中可通过标记确定该 ΑΡ在哪一个负载均衡组中， 在 WLAN网络运行过程中, 可对该 ΑΡ的负载均衡配置进行修改。
图 2 是本发明所述的无线局域网某个负载均衡组内负载均衡系统实现示 意图。
图中，某个负载均衡组 201记为 G1，分配到负载均衡组 G1的接入点（ΑΡ) 202-204 每个 ΑΡ的负载水平由自身存储的负载均衡信息和 WLAN网络运行 时各个 ΑΡ通过设备私有协议交互得到的动态负载均衡信息决定。在一个负载 均衡组中只有一个负载均衡代理中心， 其余为非负载均衡代理中心。 在 G1初 始化的时候，接入点 202〜204通过设备间私有协议进行信息交互自组织选出一 个负载水平最轻的 AP作为负载均衡代理中心， 比如接入点 202， 在该 AP上 建立当前负载均衡组的在线 AP设备的负载信息表， 定义状态有轻载、 正常运 行、重载，保存并根据接入点设备发送的上下线和负载信息更新该负载信息表。 在 WLAN网络运行中， 当接入点 202的负载水平超过负载代理水平上限， 则 接入点 202 204 重新进行信息交互根据负载水平自组织选出新的负载均衡代 理中心， 比如接入点 203，接入点 202将维护的负载信息表传送给接入点 203， 同时在负载均衡组内发送广播消息通知新的负载均衡代理中心的地址。
站点 （STA) 205~207接入到负载均衡组 Gl。 站点 STA必须在负载群组 内选择性接入负载相对较低并且相对最适合该站点接入的接入点。 在 G1中， 当某个 AP由于负载水平过重而拒绝某个站点 STA的接入时， 该站点 STA可 顺利接入同一负载均衡组中其他负载相对较低的接入点。
图 3是本发明所述的负载均衡代理中心处理流程图。
步骤 301， 该 AP被选定为负载均衡代理中心， 若在负载均衡组初始化时, 则建立新的负载信息表， 若是在 WLAN网络运行中， 则从旧负载均衡代理中 心继承负载信息表， 该表包含设备中其它在线 AP的负载信息。
步骤 302，侦听并接收 WLAN网络中该负载均衡组中其它 AP发送的负载 信息。
步骤 303， 保存收到的负载信息， 并更新负载信息表中发送该负载信息的
AP的负载信息。
步骤 304， 检测本 AP负载水平， 结合负载信息表记录的网络负载信息进 行负载水平处理并更新本 AP负载水平。根据当前负载水平进行站点接入处理， 若负载水平小于负载水平上限则允许站点 STA接入， 若负载水平等于大于负 载水平上限则拒绝站点 STA接入。
步骤 305， 若最新负载水平小于负载代理上限， 则转步骤 302; 若最新负 载水平等于或大于负载代理上限， 则转步骤 306。
步骤 306， 向负载均衡组发送广播消息要求选择新的负载均衡代理中心， 自组织选择负载水平最低的 AP作为负载均衡代理中心， 向新的负载均衡代理 中心移交负载信息表。 步骤 307， 向负载均衡组发送广播消息通知其它 AP新的负载均衡代理中 心的地址。
图 4是本发明所述的非负载均衡代理中心处理流程图。
步骤 401， 检测本 AP本地负载水平。
步骤 402， 若最新负载水平小于负载水平下限， 转步骤 406; 若最新负载 水平等于或大于负载水平下限则转步骤 403。
步骤 403， 从负载均衡代理中心获取网络负载信息， 结合本地负载信息进 行负载水平处理。
步骤 404， 若处理后最新负载水平小于负载水平下限， 转步骤 406; 若处 理后最新负载水平等于或大于负载水平下限则转步骤 405。
步骤 405， 向负载均衡代理中心发送本 AP的负载水平信息。
步骤 406， 更新并保存本 AP的负载水平信息。 根据当前负载水平进行站 点接入处理， 若负载水平小于负载水平上限则允许站点 STA接入， 若负载水 平等于大于负载水平上限则拒绝站点 STA接入。
当然，本发明还可有其他多种实施例，在不背离本发明精神及其实质的情 况下， 熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，但 这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业应用性
本发明所述方法， 定义更为全面的负载均衡信息，有助于实现更为完善的 负载均衡管理，通过自组织选择负载均衡代理中心实现 WLAN负载均衡系统， 充分利用整个网络中空闲资源， 减少负载均衡信息给网络通信带来的额外开 销， 有助于提高整个网络资源优化， 采用负载均衡代理中心， 可减少对上一级 服务器的依赖性， 网络负载管理更合理。

Claims

权利要求书
1、 一种无线局域网中负载均衡系统实现的方法， 其特征在于， 包括如下 步骤：
步骤一， 无线局域网中的负载均衡组初始化，在所述负载均衡组中的在线 接入点中自组织选择一个接入点作为负载均衡代理中心；
步骤二， 所述负载均衡组内的每一个接入点根据其负载水平，按照均衡优 化策略， 进行负载均衡的管理和处理， 实现网络负载均衡。
2、 根据权利要求 1所述的无线局域网中负载均衡系统实现的方法， 其特 征在于，在无线局域网的网络运行中， 当所述负载均衡代理中心的负载水平超 过代理中心门限， 则在所述负载均衡组内， 通过设备间的信息交互根据负载水 平自组织选择出另一个接入点作为新的负载均衡代理中心。
3、 根据权利要求 1或 2所述的无线局域网中负载均衡系统实现的方法， 其特征在于， 在步骤一中，是将所述负载均衡组内当前负载水平最轻的接入点 作为负载均衡中心， 并在选定负载均衡代理中心后，所述负载均衡组中其他接 入点则作为非负载均衡代理中心。
4、 根据权利要求 3所述的无线局域网中负载均衡系统实现的方法， 其特 征在于， 在步骤二中，仅所述负载均衡代理中心需要记录同一负载均衡组中其 他非负载均衡代理中心的接入点的负载信息，而非负载均衡代理中心的接入点 只需要知道所述负载均衡代理中心的位置，当非负载均衡代理中心的接入点的 负载发生变化时，将负载信息向所述负载均衡代理中心汇报， 同时可从所述负 载均衡代理中心获取当前负载均衡组的网络负载信息，结合该非负载均衡代理 中心的接入点的本机上存储的负载均衡信息进行负载均衡管理。
5、 根据权利要求 4所述的无线局域网中负载均衡系统实现的方法， 其特 征在于， 在步骤二中， 每个接入点， 包括负载均衡代理中心和非负载均衡代理 中心的接入点， 采用门限策略， 设置各自的负载上限 MAX和负载下限 MIN， 进行负载均衡的管理和处理， 其策略如下：
当该接入点的负载水平低于负载下限 MIN时， 处于轻负载状态， 允许站 点接入， 并且不发送负载变化信息；
当该接入点的负载水平介于负载上限 MAX和负载下限 MIN之间时， 处 于正常运行负载状态， 允许站点接入， 并且当该接入点负载水平发生变化时， 向所述负载均衡代理中心发送动态负载变化信息；
当该接入点的负载水平高于负载上限 MAX时， 处于重负载状态， 拒绝站 点接入。
6、 根据权利要求 5所述的无线局域网中负载均衡系统实现的方法， 其特 征在于， 所述负载均衡代理中心的处理过程包括如下步骤：
建立或继承所述负载均衡组所有在线接入点的负载信息表；
侦听所述负载均衡组内当前在线其他非负载均衡代理中心接入点的负载 信息， 接收并保存；
检测所述负载均衡代理中心接入点本机的负载水平，结合所述负载信息表 的网络负载信息进行负载水平处理并更新所述负载均衡代理中心接入点本机 的负载水平；
若本机的最新负载水平小于代理中心门限，则继续侦听并接收所述负载均 衡组内当前在线其他非负载均衡代理中心接入点的负载信息；
若本机的最新负载水平超过代理中心门限，则与当前负载均衡组内在线接 入点沟通，根据负载水平自组织选择另一个合适接入点作为新的负载均衡代理 中心， 并将在本机上存储的负载均衡信息转移到新的负载均衡代理中心， 同时 通知负载均衡组内其它接入点新的负载均衡代理中心的地址。
7、 根据权利要求 5所述的无线局域网中负载均衡系统实现的方法， 其特 征在于， 所述非负载均衡代理中心的处理过程包括如下步骤：
检测所述非负载均衡代理中心接入点本机的负载水平；
若当前负载水平低于负载下限 MIN， 则根据当前负载水平进行负载水平 处理， 在所述非负载均衡代理中心接入点本机上更新负载水平记录；
若当前负载水平超过负载水平下限 MIN， 则从负载均衡代理中心获取负 载均衡组的负载信息， 结合本地负载信息利用负载均衡算法进行负载水平处 理；
若处理后所述非负载均衡代理中心的最新负载水平低于负载水平下限 MIN, 则更新本机负载水平；
若处理后最新负载水平超过负载水平下限 MIN， 则向所述负载均衡代理 中心发送本机负载均衡水平信息， 并更新本机负载水平。
8、 根据权利要求 1所述的无线局域网中负载均衡系统实现的方法， 其特 征在于， 还包括一步骤， 对负载信息进行分类， 分为：
静态负载信息， 由接入点自身系统资源获取并存储， 包括 CPU的频率、 内存的大小、 网络连接的能力；
统计负载信息， 由接入点自身系统的历史的性能数据中获取并存储，包括 延迟和带宽；
动态负载信息， 由负载均衡代理中心搜集并保存， 包括网络实时负载水平 信息。
9、 根据权利要求 3所述的无线局域网中负载均衡系统实现的方法， 其特 征在于，在一个负载均衡组中如果只有一个接入点村存在， 则该接入点作为负 载均衡代理中心。
10、 根据权利要求 6或 7所述的无线局域网中负载均衡系统实现的方法， 其特征在于，对于负载均衡组中的移动站点， 是在所述负载均衡组内选择性接 入负载相对较低并且相对最适合该站点接入的接入点，当一个接入点由于负载 过重而拒绝该站点接入时，该站点可顺利接入同一负载均衡组中其他负载相对 较低的接入点。
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