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Dynamic channel allocation method of WLAN (wireless local area network) system

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CN104581813A
CN104581813A CN 201510044241 CN201510044241A CN104581813A CN 104581813 A CN104581813 A CN 104581813A CN 201510044241 CN201510044241 CN 201510044241 CN 201510044241 A CN201510044241 A CN 201510044241A CN 104581813 A CN104581813 A CN 104581813A
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system
channel
wireless
interference
ap
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CN 201510044241
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CN104581813B (en )
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王玉玲
宫淑兰
汪明
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山东建筑大学
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/10Scheduling measurement reports ; Arrangements for measurement reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/08Wireless resource allocation where an allocation plan is defined based on quality criteria
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/08Wireless resource allocation where an allocation plan is defined based on quality criteria
    • H04W72/082Wireless resource allocation where an allocation plan is defined based on quality criteria using the level of interference

Abstract

The invention discloses a dynamic channel allocation method of a WLAN (wireless local area network) system. AP (access point) nodes of the WLAN system measure signal strength, generate signal strength test reports and transmit the signal strength test reports to a wireless AC (access controller); the wireless AC builds a system interference model and sets interference model parameters through the signal strength; calculating is performed by optimization to obtain a group of channel numbers allowing a smallest interference model; the wireless AC allocates a running frequency point for each AP node according to the calculated channel numbers and distributes the running frequency points to the AP nodes through configuration files; the AP nodes adjust running frequencies according to the configuration files. The dynamic channel allocation method helps reduce intra-system interference and improve system capacity.

Description

一种WLAN系统动态信道分配方法 Between a WLAN system dynamic channel allocation method

技术领域 FIELD

[0001] 本发明涉及WLAN通信领域中的频率规划技术,尤其涉及基于802. 11协议的WLAN 系统中AP节点的工作频率选择方法。 [0001] The present invention relates to frequency planning WLAN technology in the field of communications, particularly to a WLAN system based on the 802.11 protocol operating frequency AP node selection method.

背景技术 Background technique

[0002] 无线局域网的出现作为一种广泛使用的接入技术,提供宽带无线接入到Internet。 [0002] The emergence of wireless LANs as an access technology is a widely used, providing broadband wireless access to the Internet. 基于802. 11的WLAN系统为无线终端随时随地的宽带接入Internet提供了可能,在校园、宾馆以及办公楼等领域得到了广泛应用。 Broadband WLAN system based on 802.11 wireless terminal anytime, anywhere access to the Internet offers the possibility, widely used in schools, hotels and office buildings and other fields. WLAN系统包括AC(无线控制器)、 AP(无线接入点)和STA(站点即终端设备)。 The system comprises a WLAN AC (radio control), AP (wireless access point) and the STA (i.e., terminal station).

[0003] 为了保证对局域网内的终端提供随时随地的高速接入,WLAN的建设通常需要布置大量AP节点,为了保证AP节点获得最大吞吐量,必须降低AP之间的干扰,合理的频率规划是成为WLAN建设的关键技术之一。 [0003] In order to guarantee the terminal anywhere in the high-speed access in the LAN, WLAN construction generally requires a large amount AP node is arranged, in order to ensure maximum throughput AP node, must reduce interference between AP, frequency planning is reasonable WLAN technology has become one of the key construction. 在实际应用过程中,受到电源的提供位置、用户分布的非均匀性等多种因素的影响,很难按照某一种统一的方案实现整个无线网络的覆盖,因此对于这种非规则的AP布放,需要一种有效的频率规划手段。 In the practical application process, provided by the location of the power, influenced by many factors of non-uniformity of the distribution of the user, it is difficult to achieve coverage of the entire wireless network according to one embodiment of a unified, so for this irregular distribution AP put the need for an effective frequency planning tools.

发明内容 SUMMARY

[0004] 为解决现有技术存在的不足,本发明公开了一种WLAN系统动态信道分配方法,本专利针AP节点工作频点的规划问题,申请基于信道干扰模型的频率规划。 [0004] To solve the disadvantages of the prior art, the present invention discloses a dynamic channel allocation method for a WLAN system, the present patent planning needle AP node's working frequency, frequency planning application is based on channel interference model. 主要思想是建立WLAN系统的干扰模型,以干扰模型取值最小为目的设定目标函数,通过采用最优化方法求一组AP节点的频率参数。 The main idea is to interfere with the WLAN system model, interference model to a minimum value of the objective function is set for the purpose of seeking a set of frequency parameters AP node by using the optimization method.

[0005] 为实现上述目的,本发明的具体方案如下: [0005] To achieve the above object, according to the present invention, the following specific embodiments:

[0006] 一种WLAN系统动态信道分配方法,包括以下步骤: [0006] A WLAN system dynamic channel allocation method, comprising the steps of:

[0007] 步骤一:WLAN系统中AP节点完成信号强度测量,并生成信号强度测试报告,将测试报告发送给AC无线控制器; [0007] Step a: WLAN AP node system completion signal strength measurements, and generating a signal strength measurement report, send the test report to the access controller AC;

[0008] 步骤二:AC无线控制器建立系统干扰模型,并采用信号强度设置干扰模型参数, 采用最优化方法计算得到使得干扰模型最小的一组信道编号; [0008] Step Two: AC system controller establishes a radio interference model, and using the signal intensity setting interference model parameters calculated using the optimization method so as to minimize interference model a set of channel numbers;

[0009] 步骤三:AC无线控制器根据计算得到的信道编号为每个AP节点配置工作频点,并将工作频点通过配置文件下发给每个AP节点;AP节点根据配置文件调整工作频率。 [0009] Step Three: AC radio controller according to the channel numbers calculated for each AP node configuration working frequency point, and the working frequency point by configuring the document issued to each AP node; AP node in accordance with the frequency adjustment profile .

[0010] 所述步骤一的具体过程为:初始时刻,AC无线控制器将所有AP节点配置为同一信道,即将所有AP节点的工作频点设置为设定频率,发送功率设置为p,并指明需周期性测量信号强度,生成配置文件并下发到所有η个AP节点(假设分别为AP1, AP2,……,APn),AP 节点按照配置文件给定参数进行工作,启动定时器,当定时器到期,AP节点扫描所有信道, 检测各个信道上接收到的信号强度以及产生该信号的AP节点的相关信息,生成信号强度报告,发送给AC无线控制器。 [0010] The steps of a specific process: the initial time, the AC AP radio controller configures all nodes to the same channel, i.e. all the working frequency point AP node is arranged to set the frequency, transmission power is set to p, and specify need to periodically measure the signal strength, generating a configuration file and delivered to all nodes η th AP (assuming respectively AP1, AP2, ......, APn), AP node operates, starting a timer for a given parameter in the configuration file, when the timing expires, an AP node scans all the channels, each channel detection signal intensity of the received AP node information and generating the signal, generating the signal strength reports transmitted to the wireless controller AC.

[0011] 所述步骤二中,系统干扰模型定义为: [0011] In step two, the system interference model is defined as:

[0012] [0012]

Figure CN104581813AD00041

[0013] 其中δ (Lf^fn)为系统总干扰,f1; &"4为WLAN网络中的η个AP节点的信道编号,S u为AP i即第i个AP节点对AP」即第j个AP节点)的干扰值。 [0013] where δ (Lf ^ fn) for the total system interference, f1; & "4 is η th AP node of the channel number in the WLAN network, S u is the AP i i.e. the i-th AP node AP" i.e., the j AP node a) of the interference value.

[0014] δ u其定义为接收到的信号功率与AP的工作信道相关的函数: [0014] δ function u is defined as a working channel of the received signal power associated with the AP:

[0015] [0015]

Figure CN104581813AD00042

[0016] 其中:Pij为AP艰到的来自AP」的信号强度,f种f」为AP ^ AP」所使用的信道号。 [0016] where: Pij is difficult to AP signal strength from the AP "is, f f species" is a channel number AP AP ^ "is used.

[0017] 所述WLAN系统包含1个AC和η个AP,η为大于等于1的整数。 [0017] The WLAN system comprises an AC and a [eta] AP, η is an integer of 1.

[0018] 所述AP节点进行信号强度测量可以由AC无线控制器发送消息触发进行。 [0018] The AP node signal strength measurements may be transmitted by the access controller AC for triggering message.

[0019] 工作原理:初始化时,AC设置所有AP工作在同一信道fi,且采用标准发送功率P, AC将配置文件下发给所有AP。 [0019] The working principle: initialization, AC AP working on the same set all channels fi, and the standard transmission power P, AC document issued to all AP configuration.

[0020] AP按照接收到的配置文件工作,并周期性的检测来自其他AP的信号强度,生成信号强度报告,并将信号强度报告发送给AC。 [0020] AP according to the received profile work, and periodically detects the signal strength of the AP from the other, generating a signal strength report, and sends a signal strength report to the AC.

[0021] AC以得到的信号强度为设置参数Pij,建立系统干扰模型。 [0021] AC signal strength obtained for the set parameters Pij, established model system interference.

[0022] 采用最优化算法求取使系统干扰最小的一组参数(f\,&·· fn); [0022] The optimization algorithm obtains minimum interference of the system a set of parameters (f \, & ·· fn);

[0023] 将(Lf^fn)作为η个AP节点的信道号,根据每个AP节点的编号设置该节点的工作频率,生成配置文件,并下发给各个AP节点。 [0023] The (Lf ^ fn) η as a channel number of the AP node, this node is set according to the numbering of each AP node operating frequency, generating a configuration file, and delivers each AP node.

[0024] AP节点接收并按照配置文件调整工作频率。 [0024] AP node receives and adjusts the operating frequency in the configuration file.

[0025] 本发明的有益效果: [0025] Advantageous effects of the invention:

[0026] 本专利针AP节点工作频点的规划问题,提出了一种基于信道干扰模型的频率规划方法。 [0026] Programming of the present patent needles working frequency of the AP node, proposed a method of frequency planning model based on channel interference. 该方法的实施有助于减小系统内的干扰、提高系统容量。 The embodiment of the method facilitates interference reduction system, improving system capacity.

附图说明 BRIEF DESCRIPTION

[0027] 图IWLAN系统示意图; [0027] FIG IWLAN system diagram;

[0028] 图2AC信道分配工作流程; [0028] FIG 2AC channel allocation workflow;

[0029] 图3ΑΡ信道分配工作流程。 [0029] FIG 3ΑΡ channel allocation workflow.

具体实施方式: detailed description:

[0030] 下面结合附图对本发明进行详细说明:如图1所示,一个WLAN系统中包含1个AC 和η个AP,初始时刻,AC将所有AP配置为1信道,及将所有AP的工作频点设置为2. 412GHz, 发送功率设置为500mW,并指明需周期性测量信号强度,生成配置文件并下发到所有η个AP。 [0030] DRAWINGS The present invention will be described in detail: As shown, a WLAN system comprises an AC and a η AP 1, the initial time, all AC AP is configured to channel 1, the AP and all work frequency is set to 2. 412GHz, transmission power to 500mW, and indicate the need to periodically measure the signal strength, generating a configuration file and delivered to all η one AP. AP节点按照配置文件给定参数进行工作,启动定时器,当定时器到期,AP节点扫描所有信道(2. 4GHz频段我国为1-13号),检测各个信道上接收到的信号强度以及发送端ΑΡ,生成信号强度报告,发送给AC。 AP node in accordance with the parameters given work profile, starting a timer, when the timer expires, the AP node scans all channels (2. 4GHz band is number of 1-13), is detected on each channel the received signal strength and a transmission end ΑΡ, generates a signal strength reports transmitted to the AC. AC节点收到的来自η个AP的信号强度报告,根据信号强度报告得到Pij,即APi接收到的来自AP」的信号强度,建立系统干扰模型 Η AC node receives from one AP signal strength reports, reports based on signal strength Pij obtained, i.e. APi received signal strength from the AP "is established model system interference

Figure CN104581813AD00043

[0031] 其中,δ的,f2〜fn)为系统总干扰,f1; &"4为WLAN网络中的η个AP节点的信道编号,S u为AP i (第i个AP节点)对APj (第j个AP节点)的干扰值。 For the total system interference [0031] wherein, δ of, f2~fn), f1; & "4 η is a channel number AP node in the WLAN network, S u i is the AP (AP i-th node) of APj ( AP j-th node) of the interference value.

[0032] δ ^_其定义为接收到的信号功率与AP的信道相关的函数: [0032] δ ^ _ defined as a channel of the received signal power associated with the AP function:

[0033] [0033]

Figure CN104581813AD00051

[0034] 其中:Pij为AP艰到的来自AP」的信号强度,f种f」为AP ^ AP」所使用的信道号。 [0034] where: Pij is difficult to AP signal strength from the AP "is, f f species" is a channel number AP AP ^ "is used.

[0035] 采用最优化算法求取使系统干扰最小的一组参数(f\,ff fn); [0035] The optimization algorithm obtains minimum interference of the system a set of parameters (f \, ff fn);

[0036] 将作为η个AP节点的信道号,根据每个AP节点的编号设置该节点的工作频率,生成配置文件,并下发给各个AP节点。 [0036] The AP node as η a channel number, according to the numbering of the nodes of each set operating frequency AP node, generating a configuration file, and delivers each AP node.

[0037] AP节点接收配置文件并按照配置文件调整工作频率。 [0037] AP node receives the configuration file and adjust the operating frequency in the configuration file.

[0038] AC的工作流程如图2所示,设置η个AP的工作信道为k,下发配置文件,接收来自AP的信号强度报告,干扰模型参数设置,采用最优化方法求取信道参数组,判断信道参数是否更新,如果是,则设置各个AP工作频点,下发配置文件。 [0038] AC workflow shown in Figure 2, η is provided a working channel of an AP k, issued configuration file, the report received signal strength from the AP, the interference model parameter set, using the optimization method obtains the channel parameters determining whether to update the channel parameters, if so, set the working frequency of each AP, issued configuration file.

[0039] AP的工作流程如图3所示,开始,判断定时器是否超时及AC是否要求进行信号强度测试,如果是,扫描信道,生成信号强度报告,向AC发送信号强度报告。 [0039] AP workflow shown in Figure 3, it begins, and determines whether or not the timer times out if the signal strength test AC requirements, if it is, the channel scanning, to generate a signal strength report, send a signal strength report to the AC. AC -般通过有线连接AP节点,AP节点通过无线连接终端设备,终端设备为手机,笔记本之类的。 AC - general AP node via a wired connection, a wireless connection by AP node terminal device, the terminal device is a mobile phone, notebook or the like.

[0040] 上述虽然结合附图对本发明的具体实施方式进行了描述,但并非对本发明保护范围的限制,所属领域技术人员应该明白,在本发明的技术方案的基础上,本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。 [0040] The combination with drawings of specific embodiments of the present invention have been described, but not limit the scope of the present invention, those skilled in the art should understand that, on the basis of the technical solution of the present invention, those skilled in the art without paying creative work to make various modifications or variations are still within the scope of the present invention.

Claims (6)

1. 一种WLAN系统动态信道分配方法,其特征是,包括以下步骤: 步骤一:WLAN系统中AP节点完成信号强度测量,并生成信号强度测试报告,将测试报告发送给AC无线控制器; 步骤二:AC无线控制器建立系统干扰模型,并采用信号强度设置干扰模型参数,采用最优化方法计算得到使得干扰模型最小的一组信道编号; 步骤三:AC无线控制器根据计算得到的信道编号为每个AP节点的配置工作频点,并将工作频点通过配置文件下发给每个AP节点;AP节点根据配置文件调整工作频率。 A WLAN system dynamic channel allocation method, which is characterized by comprising the following steps: Step one: AP node completes WLAN signal strength measurement system, and generating a signal strength measurement report, send the test report to the access controller AC; Step two: AC wireless controller establishes a system of interference model, and using the signal intensity setting interference model parameters, using the optimization method is calculated such that the interference model minimal set of channel numbers; step three: AC radio controller according to the channel number calculated as Configuring working frequency of each AP node, and the working frequency of each document by the AP to the node configuration; AP node frequency adjustment based on the profile.
2. 如权利要求1所述的一种WLAN系统动态信道分配方法,其特征是,所述步骤一的具体过程为:初始时刻,AC无线控制器将所有AP节点配置为同一信道,即将所有AP节点的工作频点设置为设定频率,发送功率设置为P,并指明需周期性测量信号强度,生成配置文件并下发到所有n个AP,AP节点按照配置文件给定参数进行工作,启动定时器,当定时器到期,AP节点扫描所有信道,检测各个信道上接收到的信号强度以及产生该信号的AP节点的相关信息,生成信号强度报告,发送给AC无线控制器。 All AP upcoming initial time, the AC radio controller configures all channels the same AP node,: 2. The one WLAN system dynamic channel allocation method according to claim 1, wherein said step of a specific process working frequency is the set frequency set node, setting the transmission power is P, and indicate the need to periodically measure the signal strength, generating a configuration file and delivered to all of the n AP, AP node operates in accordance with a given parameter configuration file, start timer, when the timer expires, the AP node scans all the channels, each channel related information detected the received signal strength of the AP node, and generating the signal, generating the signal strength reports transmitted to the wireless controller AC.
3. 如权利要求1所述的一种WLAN系统动态信道分配方法,其特征是,所述步骤二中,系统干扰模型定义为: 3. An WLAN system dynamic channel allocation method according to claim 1, wherein said step two, the system interference model is defined as:
Figure CN104581813AC00021
其中S 为系统总干扰,4,4〜4为11^网络中的11个4?节点的信道编号,S^为APi即第i个AP节点对AP」即第j个AP节点的干扰值。 Wherein S is the total interference in the system, the network 4,4~4 11 ^ 11 4? Channel number of the node, i.e. S ^ for the i-th AP APi interference value on AP node "i.e. the j-th AP nodes.
4. 如权利要求3所述的一种WLAN系统动态信道分配方法,其特征是,Su其定义为接收到的信号功率与AP的信道相关的函数: 4. An WLAN system dynamic channel allocation method according to claim 3, characterized in that, which is defined as a function Su channel received signal power associated with the AP:
Figure CN104581813AC00022
其中:Pi」为APi收到的来自AP」的信号强度,fi和f」为APJPAP」所使用的信道号。 Wherein: Pi "is the signal strength from the AP" is received APi, fi and f 'is the channel number APJPAP "used.
5. 如权利要求1所述的一种WLAN系统动态信道分配方法,其特征是,所述WLAN系统包含1个AC和n个AP,n为大于等于1的整数。 5. An WLAN system dynamic channel allocation method according to claim 1, characterized in that the system comprises a WLAN AC and the AP of n, n is an integer of 1.
6. 如权利要求1所述的一种WLAN系统动态信道分配方法,其特征是,所述AP节点进行信号强度测量可以由AC无线控制器发送消息触发进行。 Between a WLAN system, the dynamic channel allocation method as claimed in claim 1, wherein said signal strength measurements AP node may be transmitted by the access controller AC for trigger messages.
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