WO2013004093A1 - 一种无线接入控制器切换方法和无线接入点 - Google Patents

一种无线接入控制器切换方法和无线接入点 Download PDF

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Publication number
WO2013004093A1
WO2013004093A1 PCT/CN2012/072614 CN2012072614W WO2013004093A1 WO 2013004093 A1 WO2013004093 A1 WO 2013004093A1 CN 2012072614 W CN2012072614 W CN 2012072614W WO 2013004093 A1 WO2013004093 A1 WO 2013004093A1
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Prior art keywords
information
configuration information
address
interface configuration
standby
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PCT/CN2012/072614
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English (en)
French (fr)
Inventor
杨良军
陶秉魁
倪冬华
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中兴通讯股份有限公司
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Publication of WO2013004093A1 publication Critical patent/WO2013004093A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a wireless access controller switching method and a wireless access point.
  • WLAN Wireless Fidelity
  • the WLAN network is gradually developed to the thin AP (Wireless Access Point) + AC (Wireless Access Controller) mode due to the complex management of the fat AP (Access Point, wireless access point), and the thin AP + AC
  • the advantages are in the AC unified configuration management AP, convenient network management data collection.
  • the administrator does not log in to the AP page configuration parameters. Only when the AP is successfully registered with the AC, the AC manages the delivery of parameters and configurations.
  • the AP that is switched over causes the user service associated with the AP to be interrupted, and the user needs to re-associate the authentication. Summary of the invention
  • a common switching method is to set the two ACs to the same IP address, but the same IP address switching has the following two disadvantages:
  • the AP After the AP is disconnected from the active AC, the AP switches to the standby AC.
  • the IP address is the same.
  • the AP After the AP joins the standby AC, the AP does not know whether it is the primary link or the backup link. The flag indicates whether the configuration needs to be delivered, and the re-distribution configuration occurs. The hot standby switch cannot be implemented.
  • the same ATCA (Advanced Telecom Computing Architecture) chassis is connected to two sets of ACs at the same time.
  • the data between the AP management control board and the user service access board in the two sets of ACs are all from the same block.
  • Switch board forwarding if the AP manages the IP address of the control board If the address is the same, then the user service access board cannot determine which AP management control board is the main control board, so it cannot be applied to the same ATCA chassis networking.
  • the technical problem to be solved by the present invention is to provide a wireless access controller switching method and a wireless access point to ensure that user services are not interrupted.
  • the present invention provides a radio access controller (AC) handover method, including:
  • the wireless access point obtains the address information of the first AC and the second AC, and after the AP successfully registers the first AC, obtains the radio interface configuration information and the tunnel interface configuration information from the first AC; After the network link is disconnected, the registration is initiated to the second AC, from the second
  • the AC obtains new tunnel interface configuration information, and uses the previously obtained radio interface configuration information and acquires new tunnel interface configuration information from the second AC to implement user services.
  • the AP obtains the address information of the first AC and the second AC
  • the method includes: the AP sends a request message for obtaining an AC address to the device that stores the active and standby AC addresses, where the device storing the active and standby AC addresses is
  • the response message sent to the AP carries the address of the first AC and the second AC
  • the AP obtains the address information of the first AC and the second AC by parsing the response packet.
  • the addresses of the first AC and the second AC are located in an optional field of the response message.
  • the AC address as the primary AC is written in front of the AC address as the standby AC.
  • the initiating registration with the second AC, and acquiring the new tunnel interface configuration information from the second AC includes: the AP initiating a join request to the second AC, and carrying a specific flag bit in the request, where the After receiving the join request with the specific flag, the AC sends a new tunnel interface configuration information to the AP, and does not send the radio interface configuration information to the AP.
  • the method further includes: when the user associates the AP, and the service of the user is in the centralized tunnel forwarding mode,
  • the first AC periodically synchronizes the following information to the second AC: user information, address resolution protocol (ARP) information, AP address information, authentication information, routing table information; or
  • ARP address resolution protocol
  • the first AC When the user is associated with the AP, the first AC periodically synchronizes the following information to the second AC: the AP address information and the routing table information.
  • the method further includes: the AP respectively sending a discovery request to the first AC and the second AC, and after the second AC responds, Initiate registration with the second AC.
  • the present invention further provides a wireless access point (AP) for implementing wireless access controller (AC) handover, including an information acquisition module, a registration module, and a service module, where: the information acquisition module The method is configured to: obtain the address information of the first AC and the second AC, and obtain the radio interface configuration information and the tunnel interface configuration information from the first AC after the AP successfully registers the first AC;
  • AP wireless access point
  • AC wireless access controller
  • the registration module is configured to: after the network link between the AP and the first AC is disconnected, initiate registration with the second AC, and acquire new tunnel interface configuration information from the second AC;
  • the service module is configured to: use the wireless interface configuration information acquired by the information acquiring module, and the registration module obtains new tunnel interface configuration information from the second AC to implement user services.
  • the information acquiring module is configured to: obtain the address information of the first AC and the second AC in the following manner: the information acquiring module sends a request message for requesting the AC address to the device storing the active and standby AC addresses And receiving the response packet that is sent by the device that stores the active and standby AC addresses, and parsing the response packet to obtain the address information of the first AC and the second AC.
  • the server or the AC connected to the AP is configured to: obtain the address information of the first AC and the second AC in the following manner: the information acquiring module sends a request message for requesting the AC address to the device storing the active and standby AC addresses And receiving the response packet that is sent by the device that stores the active and standby AC addresses, and parsing the response packet to obtain the address information of the first AC and the second AC.
  • the server or the AC connected to the AP The server or the AC connected to the AP.
  • the registration module is configured to: initiate registration with the second AC in the following manner, and acquire new tunnel interface configuration information from the second AC: the registration module initiates a join request to the second AC, and in the request Carrying a specific flag bit, and receiving the second AC to send new tunnel interface configuration information to the AP.
  • the registration module is further configured to: after the network link between the AP and the first AC is disconnected, initiate a discovery request to the first AC and the second AC respectively, and after the second AC responds to the response,
  • the embodiment of the invention implements hot standby switching of the active and standby ACs, and avoids service interruption of STA (Station, workstation) users.
  • STA Statation, workstation
  • two sets of AC devices can coexist in the same ACTA chassis.
  • the two AC AP management boards can be configured with different addresses and are more flexible to use.
  • two sets of AC devices can coexist in the network at the same time, it is also convenient for WEB page access and network management data collection.
  • FIG. 1 is a flowchart of a centralized forwarding mode switching according to Embodiment 1 of the present invention
  • Figure 3 is a flow chart showing the handover when the external DHCP server is provided in Embodiment 3 of the present invention.
  • the solution for implementing wireless access controller switching includes:
  • the AP obtains the address information of the first AC and the second AC. After the AP successfully registers the first AC, the AP obtains the radio interface configuration information and the tunnel interface configuration information from the first AC.
  • the AP After the network link between the AP and the first AC is disconnected, the AP initiates registration with the second AC, acquires new tunnel interface configuration information from the second AC, and uses the previously obtained wireless interface configuration information and the second AC. Obtain new tunnel interface configuration information to implement user services.
  • the process of the AP accessing the AC includes the following steps: Step 1: Start the AP and the AC device.
  • Step 2 The AP sends a request message to the device that stores the active and standby AC addresses, requesting to obtain an AC address.
  • the device carries the address of the first AC and the second AC in the offer message replied to the AP.
  • the device includes a DHCP (Dynamic Host Configuration Protocol) server or an AC connected to the AP.
  • DHCP Dynamic Host Configuration Protocol
  • the device that stores the primary and secondary AC addresses sets the address of the first AC and the second AC in an optional field of the offer packet, and the AP obtains the first AC and the second AC by parsing the offer packet. Address information.
  • the AC address as the primary AC is written in front, and the AC address as the standby AC is written later.
  • the address of the first AC is written in front, and the address of the second AC is written later.
  • Step 3 After obtaining the addresses of the first AC and the second AC, the AP initiates a discovery request to the two ACs (Discovery of the CAPWAP (Control and Provisioning of Wireless Access Points) protocol). Message);
  • the AP can know the current status of the two ACs by sending Discover messages periodically.
  • Step 4 If both the first AC and the second AC respond to the request, the AP selects the first AC as the primary AC according to the address sequence of the option field.
  • Step 5 The first AC serving as the primary AC sends the radio interface configuration information and the tunnel interface configuration information to the AP.
  • the radio interface configuration information includes a wireless mode, a Service Set Identifier (SSID) name, a channel frequency, a transmit power, and the like; the tunnel interface information includes a tunnel address and a port.
  • SSID Service Set Identifier
  • the process of implementing user services includes the following steps:
  • Step 1 The user associates with the AP, and the service is normal.
  • Step 2 The primary AC and the standby AC periodically synchronize information through heartbeat detection and VRRP (Virtual Router Redundancy Protocol).
  • VRRP Virtual Router Redundancy Protocol
  • the primary and backup AC synchronization information includes: user information, ARP (Address Resolution Protocol) information, AP address information, authentication information, and routing table information.
  • ARP Address Resolution Protocol
  • the information about the active/standby AC synchronization includes: AP address information and routing table information.
  • the active and standby ACs can make other connected devices not aware of new ACs and ensure seamless switching of user services.
  • Step 3 After the AP is disconnected from the primary AC link, the AP initiates a join request to the standby AC (the CAPWAP protocol join message), and carries a specific flag bit in the request. The specific flag bit is used to prepare the AP. The AC only sends new tunnel interface configuration information.
  • the standby AC the CAPWAP protocol join message
  • the AP initiates a discovery request to the standby AC, and the standby AC responds with a response, and then the AP initiates a join request to the standby AC.
  • the AP may also initiate a discovery request to the primary AC.
  • Step 4 After the standby AC receives the join request with the specific flag, the standby AC does not re-issue the wireless interface configuration information, but only sends the new tunnel interface configuration information, and the AP and the standby AC maintain a new link. Live state.
  • the AP maintains the configuration of the primary AC's wireless interface. This ensures that the AP's switching between ACs does not affect STA services. At the same time, the problem that the two ACs cannot share the ATCA chassis is solved.
  • the entire radio access controller is composed of the AP management control board and the user service access board.
  • the AP and the AP management control board use the option field to implement backup and backup of the active and standby AC configuration data.
  • the wireless access point implementing the above method includes an information acquisition module, a registration module, and a service module, where:
  • the information acquiring module is configured to obtain address information of the first AC and the second AC, and obtain radio interface configuration information and tunnel interface configuration information from the first AC after the AP successfully registers the first AC;
  • the registration module is configured to initiate registration with the second AC and obtain new tunnel interface configuration information from the second AC after the network link between the AP and the first AC is disconnected;
  • the service module is configured to use the wireless interface configuration information acquired by the information acquiring module, and the registration module obtains new tunnel interface configuration information from the second AC to implement user service.
  • the information acquiring module is configured to obtain the address information of the first AC and the second AC in the following manner: the information acquiring module sends a request message for requesting the acquisition of the AC address to the device storing the active and standby AC addresses, And receiving the response packet that is sent by the device that stores the active and standby AC addresses, and parsing the response packet to obtain the address information of the first AC and the second AC.
  • the registration module is configured to initiate registration with the second AC in the following manner, and obtain new tunnel interface configuration information from the second AC: the registration module initiates a join request to the second AC, and carries the request in the request. And receiving, by the second AC, the new tunnel interface configuration information to the AP.
  • the registration module is further configured to: after the network link between the AP and the first AC is disconnected, initiate a discovery request to the first AC and the second AC respectively, and after the second AC responds to the response, The second AC initiates registration.
  • the AP group and the WLAN configuration parameters are set in advance on the active and standby ACs.
  • Two AC addresses are configured in the option field of the AP address pool information of the active and standby ACs.
  • An AC address is the address of the primary AC
  • the second AC address is the address of the standby AC.
  • the status of the heartbeat detection between the active and standby ACs is determined.
  • the AP is from the primary AC.
  • the user's service is in the centralized tunnel forwarding mode. As shown in Figure 1, the following steps are included:
  • Step 101 The AP initiates a CAPWAP Discover message to the AC of the network to obtain an address.
  • Step 102 The primary AC receives the Discover message sent by the AP, and responds to the DHCP response message, which is an offer (provided) message, and carries the active and standby AC addresses in the option field of the packet, where the primary AC address is in the standby AC address.
  • the AP obtains the active and standby AC addresses by parsing the offer message returned by the AC.
  • Step 103 The AP initiates a Discover message to two AC addresses at the same time.
  • Step 104 The active and standby ACs respectively respond to the Discover message sent by the AP.
  • Step 105 After receiving the response of the two AC responses, the AP initiates a CAPWAP join request to the first AC address according to the AC address sequence in the option field, requesting registration of the primary AC;
  • Step 106 After the AP successfully registers the first AC, that is, the primary AC, the primary AC sends the corresponding wireless.
  • Step 107 The WLAN user (STA) associates the AP, and obtains a user address by using a centralized service tunnel forwarding mode.
  • Step 108 The AP establishes a service tunnel with the primary AC, and sends a service request to the primary AC.
  • Step 110 The WEB authentication service is normal.
  • Step 111 After the user accesses the primary AC through the AP, the active and standby ACs synchronize the following information through heartbeat detection and VRRP (Virtual Router Redundancy Protocol): user information, ARP information, user address information, AP address information, authentication information, and routing table.
  • VRRP Virtual Router Redundancy Protocol
  • Step 112 The network link between the AP and the primary AC is disconnected, when the AP and the primary AC are disconnected several times.
  • the AP After (for example, 3 times) the link timing keep-alive fails, the AP initiates a Discover request message to the standby AC address, and prepares an AC response response;
  • the AP may initiate a Discover to the primary AC while initiating the Discovery to the standby AC.
  • the active AP may switch the AP back to the primary AC.
  • Step 113 The AP sends a join request carrying a specific flag to the standby AC, where the specific flag is used to notify the standby AC to join the backup switch, and only needs to prepare the AC to send the tunnel interface configuration, but does not need to re-issue the wireless Interface configuration.
  • the AP After registering the standby AC, the AP continues to use the original wireless interface configuration, and the service is not interrupted.
  • the AP and WLAN configuration parameters are set in advance on the active and standby ACs.
  • Two AC addresses are configured in the option field of the AP address pool information of the active and standby ACs.
  • the AC address is the address of the primary AC
  • the second AC address is the address of the standby AC.
  • the status of the active and standby ACs is determined by the heartbeat detection (including the AC status and interface status).
  • the AP obtains the master from the primary AC.
  • the standby AC address is used as the local forwarding mode. As shown in 2, the following steps are included:
  • Step 201 The AP initiates a Discover message to the AC of the network to request an address.
  • Step 202 The primary AC receives the Discover message sent by the AP, and returns the offer message, and carries the active and standby AC addresses in the option field of the packet.
  • the primary AC address is before the standby AC address, and the AP resolves the offer of the AC reply. 4 ⁇ Get the active and standby AC addresses;
  • Step 203 The AP initiates a Discover message to two AC addresses at the same time.
  • Step 204 The active and standby ACs respectively respond to the Discover message sent by the AP.
  • Step 205 After receiving the response of the two AC responses, the AP initiates a join request to the first AC address according to the AC address sequence in the option field, and requests to register the primary AC.
  • Step 206 After the AP successfully registers the first AC, that is, the primary AC, the primary AC sends the corresponding radio interface configuration information and tunnel interface configuration information to the AP.
  • Step 207 The STA associates the AP with the local forwarding mode to obtain an address, and the service is normal.
  • Step 209 The network link between the AP and the primary AC is disconnected. After the number of times of the AP and the primary AC is deactivated, the AP initiates a Discover request to the standby AC to prepare an AC response. Preferably, the AP responds. When the Discovery is initiated to the standby AC, Discover can also be initiated to the primary AC.
  • Step 210 The AP sends a join request carrying a specific flag to the standby AC.
  • the AP After registering the standby AC, the AP continues to use the original wireless interface configuration, and the service is not interrupted.
  • the AP and the WLAN configuration parameters are set in advance on the active and standby ACs.
  • the status of the heartbeat detection (including the AC status and interface status) is determined between the active and standby ACs.
  • the external DHCP server that supports the option field set the primary and backup AC addresses.
  • the first AC address is the address of the primary AC
  • the second AC address is the address of the standby AC.
  • the AP obtains the active and standby AC addresses from the external DHCP server that supports the option field.
  • the flowchart is as shown in Figure 3 and includes the following steps:
  • Step 301 The AP sends a Discover message to the DHCP server, requesting to obtain an address, and parsing
  • Step 302 The AP initiates a Discover request to the two AC addresses.
  • Step 303 After receiving the response of the two AC responses, the AP initiates a join request to the first primary AC address according to the AC address sequence in the option field, and requests to register the primary AC.
  • Step 304 After the AP successfully registers the primary AC, the primary AC sends the corresponding wireless interface configuration information and tunnel interface configuration information.
  • the user is associated with the AP, and the AP is used to communicate with the active AC through the AP.
  • the active and standby AC switching processes are the same as those in the first embodiment and the second embodiment, and are not described here.
  • the primary AC address in the Option field is only one implementation before the standby AC address. In other embodiments, other sequences may be used, as long as the device storing the primary and secondary AC addresses is agreed with the AP.
  • the embodiment of the present invention implements hot standby switching of the active and standby ACs to avoid STA user service interruption.
  • two sets of AC devices can coexist in the same ACTA chassis.
  • the two AC AP management boards can be configured with different addresses and are more flexible to use.
  • two sets of AC devices can coexist in the network at the same time, it is also convenient for WEB page access and network management data collection.

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Abstract

无线接入控制器切换方法和无线接入点,保证用户业务不中断。所述方法包括:无线接入点(AP)获取第一AC和第二AC的地址信息,所述AP成功注册第一AC后,从第一AC获取无线接口配置信息和隧道接口配置信息;当AP与第一AC之间的网络链路断开后,向第二AC发起注册,从第二AC获取新的隧道接口配置信息,使用之前获取的无线接口配置信息和从第二AC获取新的隧道接口配置信息实现用户业务。所述AP包括信息获取模块、注册模块和业务模块。本发明实施例实现了主备AC的热备切换,避免工作站用户业务中断。

Description

一种无线接入控制器切换方法和无线接入点
技术领域
本发明涉及无线通讯领域, 具体涉及无线接入控制器切换方法和无线接 入点。
背景技术
随着 3G业务的深入推进, 许多移动运营商对另一项技术一一无线局域 网 ( WLAN )给予越来越多的关注, 将 WLAN作为 3G业务的重要补充, 在 数据业务量较大的热点地区大规模建网, 并积极引导用户使用 WLAN。
WLAN网络由于之前胖 AP ( Access Point, 无线接入点)管理复杂、 不 集中统一, 现在逐步向瘦 AP (无线接入点) + AC (无线接入控制器) 的模 式发展, 瘦 AP + AC的优点在 AC统一配置管理 AP、 方便网管数据釆集。
由于在瘦 AP模式下, 管理员不会登录 AP页面配置参数, 只有当 AP注 册成功 AC, 由 AC管理下发参数和配置, 所以会出现 AC间备份切换时, 备 份 AC会重新下发配置给切换过来的 AP, 导致该 AP之前关联的用户业务中 断, 且需要用户重新关联认证。 发明内容
常见的切换方式是将两个 AC设置相同 IP地址,但同一个 IP地址方式切 换存在以下两个缺点:
1、 在 AP与主 AC链路断开后, AP向备 AC切换, 由于 IP地址相同, AP向备 AC加入成功后并不知道是主链路恢复, 还是备链路切换, 所以无法 携带特定标志位告知是否需下发配置、 就会出现重新下发配置, 不能实现热 备切换;
2、 同一个 ATCA ( Advanced Telecom Computing Architecture, 先进通信 计算架构)机框中同时接入两套 AC, 由于两套 AC中的 AP管理控制板和用 户业务接入板之间数据都是由同一块交换板转发, 如果 AP管理控制板的 IP 地址相同, 那么就存在用户业务接入板无法判断哪块 AP管理控制板是主控 板, 所以不能适用于同 ATCA机框组网。
本发明要解决的技术问题是提供一种无线接入控制器切换方法和无线接 入点, 保证用户业务不中断。
为解决上述技术问题, 本发明提供了一种无线接入控制器(AC )切换方 法, 包括:
无线接入点 ( AP )获取第一 AC和第二 AC的地址信息, 所述 AP成功 注册第一 AC后, 从第一 AC获取无线接口配置信息和隧道接口配置信息; 当 AP与第一 AC之间的网络链路断开后, 向第二 AC发起注册, 从第二
AC获取新的隧道接口配置信息,使用之前获取的无线接口配置信息和从第二 AC获取新的隧道接口配置信息实现用户业务。
优选地, 所述 AP获取第一 AC和第二 AC的地址信息, 包括: AP向存 储有主备 AC地址的设备发送请求获取 AC地址的请求消息, 所述存储有主 备 AC地址的设备在向 AP回复的响应报文中携带第一 AC和第二 AC的地址, 所述 AP通过解析响应报文获取第一 AC和第二 AC的地址信息。 服务器或与该 AP组网的 AC。
优选地, 所述第一 AC 和第二 AC 的地址位于所述响应 ^艮文的可选 ( option )字段中。
优选地,在所述 option字段中,作为主 AC的 AC地址写在作为备 AC的 AC地址的前面。
优选地, 所述向第二 AC发起注册, 从第二 AC获取新的隧道接口配置 信息, 包括: 所述 AP向第二 AC发起加入请求, 并在请求中携带一特定标志 位, 所述第二 AC收到携带特定标志位的加入请求后, 向所述 AP下发新的隧 道接口配置信息, 不向所述 AP下发无线接口配置信息。
优选地,所述 AP从第一 AC获取无线接口配置信息和隧道接口配置信息 后,所述方法还包括:用户关联 AP,所述用户的业务为集中隧道转发模式时,
2 181203249 所述第一 AC定期同步以下信息到第二 AC上:用户信息、地址解析协议( arp ) 信息、 AP地址信息、 认证信息、 路由表信息; 或者
用户关联 AP, 所述用户的业务为本地转发模式时, 所述第一 AC定期同 步以下信息到第二 AC上: AP地址信息、 路由表信息。
优选地, 当 AP与第一 AC之间的网络链路断开后, 所述方法还包括: 所 述 AP分别向第一 AC和第二 AC发起发现请求, 待第二 AC回复响应后, 再 向第二 AC发起注册。
为解决上述技术问题, 本发明还提供了一种实现无线接入控制器(AC ) 切换的无线接入点(AP ) , 包括信息获取模块、 注册模块和业务模块, 其中: 所述信息获取模块设置为: 获取第一 AC和第二 AC的地址信息, 以及 在所述 AP成功注册第一 AC后,从第一 AC获取无线接口配置信息和隧道接 口配置信息;
所述注册模块设置为: 当所述 AP与第一 AC之间的网络链路断开后, 向 第二 AC发起注册, 从第二 AC获取新的隧道接口配置信息;
所述业务模块设置为: 使用所述信息获取模块获取的无线接口配置信息 和所述注册模块从第二 AC获取新的隧道接口配置信息实现用户业务。
优选地, 所述信息获取模块是设置为: 釆用以下方式获取第一 AC和第 二 AC的地址信息: 所述信息获取模块向存储有主备 AC地址的设备发送请 求获取 AC地址的请求消息, 接收所述存储有主备 AC地址的设备回复的响 应报文, 解析所述响应报文, 获取第一 AC和第二 AC的地址信息。 服务器或与该 AP组网的 AC。
优选地, 所述注册模块是设置为: 釆用以下方式向第二 AC发起注册, 从第二 AC获取新的隧道接口配置信息: 所述注册模块向第二 AC发起加入 请求, 并在请求中携带一特定标志位,接收所述第二 AC向所述 AP下发新的 隧道接口配置信息。
优选地,所述注册模块还设置为: 当 AP与第一 AC之间的网络链路断开 后, 分别向第一 AC和第二 AC发起发现请求, 待第二 AC回复响应后, 向第
3 181203249 二 AC发起注册。
本发明实施例实现了主备 AC的热备切换, 避免 STA ( Station, 工作站) 用户业务中断。 另外, 两套 AC设备可以共存在同一个 ACTA机框中, 两个 AC的 AP管理板可以配置不同地址, 使用更加灵活。 同时由于两套 AC设备 可以同时共存在网络中, 还便于 WEB页面访问和网管数据釆集。 附图概述
图 1是本发明实施例 1集中转发模式切换流程图;
图 2是本发明实施例 2本地转发模式切换流程图;
图 3是本发明实施例 3提供外置 DHCP服务器时的切换流程图。
本发明的较佳实施方式
为使本发明的目的、 技术方案和优点更加清楚明白, 下文中将结合附图 对本发明的实施例进行详细说明。 需要说明的是, 在不冲突的情况下, 本申 请中的实施例及实施例中的特征可以相互任意组合。
本文提供的实现无线接入控制器切换的方案包括:
AP获取第一 AC和第二 AC的地址信息, 该 AP成功注册第一 AC后, 从第一 AC获取无线接口配置信息和隧道接口配置信息;
当 AP与第一 AC之间的网络链路断开后, 该 AP向第二 AC发起注册, 从第二 AC获取新的隧道接口配置信息, 使用之前获取的无线接口配置信息 和从第二 AC获取的新的隧道接口配置信息实现用户业务。
下面对上述流程进行具体说明, AP接入 AC的过程包括以下步骤: 步骤一, 启动 AP和 AC设备;
步骤二, AP向存储有主备 AC地址的设备发送请求消息, 请求获取 AC 地址, 该设备在向 AP回复的 offer报文中携带第一 AC和第二 AC的地址; 存储有主备 AC 地址的设备包括 DHCP ( Dynamic Host Configuration Protocol, 动态主机设置协议)服务器或者与该 AP组网的 AC。
181203249 优选地,该存储有主备 AC地址的设备将第一 AC和第二 AC的地址置于 offer报文的可选( option )字段中, AP通过解析 offer报文获取第一 AC和第 二 AC的地址信息。 优选地可将作为主 AC的 AC地址写在前面, 将作为备 AC的 AC地址写在后面。 例如将第一 AC的地址写在前面, 将第二 AC的地 址写在后面。
步骤三, AP得到第一 AC和第二 AC的地址后, 同时向两个 AC发起发 现请求 ( CAPWAP ( Control And Provisioning of Wireless Access Points, 无线 接入点的控制和配置)协议的 Discover (发现)报文) ;
AP通过定期发送 Discover报文可以及时获知两 AC当前的状态。
步骤四, 若第一 AC和第二 AC均响应请求, 则 AP根据 option字段的地 址顺序选择第一 AC作为主 AC优先加入;
若只有一个 AC响应请求, 则 AP选择该响应请求的 AC作为主 AC。 步骤五,作为主 AC的第一 AC向 AP下发无线接口配置信息和隧道接口 配置信息。
无线接口配置信息包括无线模式、 SSID ( Service Set Identifier, 服务集) 名称、 信道频点、 发射功率等; 隧道接口信息包括隧道地址和端口。
AP接入 AC之后, 实现用户业务的过程包括以下步骤:
步骤一, 用户关联 AP, 业务正常;
步骤二, 主 AC 与备 AC 定期通过心跳检测和 VRRP ( Virtual Router Redundancy Protocol, 虚拟路由器冗余协议) 同步信息;
如果用户业务为集中隧道转发模式, 则主备 AC 同步的信息包括: 用户 信息、 ARP ( Address Resolution Protocol, 地址解析协议)信息、 AP地址信 息、 认证信息和路由表信息;
如果用户业务为本地转发模式, 则主备 AC同步的信息包括: AP地址信 息和路由表信息。
主备 AC通过同步上述信息, 可使其他对接设备察觉不到有新 AC加入, 保证用户业务无缝切换。
181203249 步骤三,当 AP与主 AC链路断开后, AP向备 AC发起加入请求( CAPWAP 协议 join (加入)报文) , 并在请求中携带一特定标志位, 该特定标志位用 于使备 AC仅下发新的隧道接口配置信息;
具体地, 当 AP与主 AC之间若干次 CAPWAP链路保活失败后, AP会 向备 AC发起发现请求, 备 AC收到 ^艮文后回复响应, 随后 AP向备 AC发起 加入请求。 优选地, 基于抢活机制, AP同时也可以向主 AC发起发现请求。
步骤四, 备 AC收到携带有特定标志位的加入请求后, 备 AC不再重新 下发无线接口配置信息, 而仅下发新的隧道接口配置信息, AP与备 AC保持 新的链路保活状态。
由于备 AC不再重新下发无线接口配置,此时 AP仍保持主 AC的无线接 口配置, 可以保证 AP在 AC之间的切换不会影响 STA用户业务。 同时解决 两 AC不能共 ATCA机框的问题。
整个无线接入控制器由 AP 管理控制板和用户业务接入板组成, AP与 AP管理控制板通过 option字段来实现主备 AC配置数据备份切换。
实现上述方法的无线接入点包括信息获取模块、 注册模块和业务模块, 其中:
所述信息获取模块, 用于获取第一 AC和第二 AC的地址信息, 以及在 所述 AP成功注册第一 AC后,从第一 AC获取无线接口配置信息和隧道接口 配置信息;
所述注册模块,用于当所述 AP与第一 AC之间的网络链路断开后, 向第 二 AC发起注册, 从第二 AC获取新的隧道接口配置信息;
所述业务模块, 用于使用所述信息获取模块获取的无线接口配置信息和 所述注册模块从第二 AC获取新的隧道接口配置信息实现用户业务。
优选地,所述信息获取模块是用于釆用以下方式获取第一 AC和第二 AC 的地址信息: 所述信息获取模块向存储有主备 AC地址的设备发送请求获取 AC地址的请求消息, 接收所述存储有主备 AC地址的设备回复的响应报文, 解析所述响应报文, 获取第一 AC和第二 AC的地址信息。
6 181203249 服务器或与该 AP组网的 AC。
优选地, 所述注册模块是用于釆用以下方式向第二 AC发起注册, 从第 二 AC获取新的隧道接口配置信息: 所述注册模块向第二 AC发起加入请求, 并在请求中携带一特定标志位,接收所述第二 AC向所述 AP下发新的隧道接 口配置信息。
优选地,所述注册模块,还用于当 AP与第一 AC之间的网络链路断开后, 分别向第一 AC和第二 AC发起发现请求, 待第二 AC回复响应后, 向第二 AC发起注册。
下面分别介绍在不同组网和业务转发下的实施例。
实施例 1
本实施例中, AP和两个 AC正确组网后, 在主备 AC预先设置好 AP分 组及 WLAN配置参数, 在主备 AC的 AP地址池信息的 option字段中配置两 个 AC地址, 其中第一个 AC地址为主 AC的地址, 第二个 AC地址为备 AC 的地址, 主备 AC之间通过心跳检测进行状态 (包括 AC状态和接口状态 ) 判断, 本实施例中, AP从主 AC获取主备 AC的地址, 用户的业务为集中隧 道转发模式, 如图 1所示, 包括以下步骤:
步骤 101 : AP向与其组网的 AC发起 CAPWAP协议的 Discover报文, 以获取地址;
步骤 102: 主 AC收到 AP发送的 Discover报文, 回复 DHCP响应报文即 offer (提供)报文, 并在报文中的 option字段中携带主备 AC地址, 其中主 AC地址在备 AC地址之前, AP通过解析 AC回复的 offer报文得到主备 AC 地址;
步骤 103: AP同时向两个 AC地址发起 Discover报文;
步骤 104: 主备 AC分别响应该 AP发送的 Discover报文;
步骤 105: AP收到两个 AC回复的响应后, 根据 option字段中的 AC地 址顺序, 优先向第一个 AC地址发起 CAPWAP协议的 join请求, 请求注册主 AC;
步骤 106: AP成功注册第一个 AC即主 AC后, 主 AC下发相应的无线
7 181203249 接口配置信息和隧道接口配置信息给该 AP;
步骤 107: WLAN用户 (STA )关联该 AP, 通过集中业务隧道转发模式 获取用户地址;
步骤 108: AP与主 AC建立业务隧道, 向主 AC发送业务请求; 步骤 109: 主 AC在该业务隧道上返回业务响应;
步骤 110: WEB认证业务正常;
步骤 111 : 用户通过 AP接入主 AC后, 主备 AC通过心跳检测和 VRRP (虚拟路由器冗余协议) 同步以下信息: 用户信息、 ARP信息、 用户地址信 息、 AP地址信息、 认证信息、 路由表信息;
步骤 112: AP与主 AC之间的网络链路断开, 当 AP与主 AC的若干次
(例如 3次)链路定时保活失败后, AP向备 AC地址发起 Discover请求艮文, 备 AC回复响应;
优选地, 该 AP在向备 AC发起 Discover 的同时还可向主 AC发起 Discover, 通过此抢活机制, 如果主 AC及时恢复正常, 可以使 AP切换回主 AC。
步骤 113: 该 AP向备 AC发送携带特定标志位的 join请求, 该特定标志 位用于通知备 AC此次加入属于备份切换, 只需备 AC下发隧道接口配置, 而不需要重新下发无线接口配置。
注册备 AC后, 该 AP延续使用原无线接口配置, 业务不会中断。
实施例 2
在本实施例中, AP和 AC正确组网后, 在主备 AC预先设置好 AP分组 及 WLAN配置参数, 在主备 AC的 AP地址池信息的 option字段中配置两个 AC地址, 其中第一个 AC地址为主 AC的地址, 第二个 AC地址为备 AC的 地址, 主备 AC之间通过心跳检测进行状态 (包括 AC状态和接口状态 )判 断,本实施例中 AP从主 AC获取主备 AC地址,用户的业务为本地转发模式, 如 2所示, 包括以下步骤:
步骤 201: AP向与其组网的 AC发起 Discover报文, 请求获取地址;
8 181203249 步骤 202: 主 AC收到 AP发送的 Discover报文, 回复 offer报文, 并在 报文的 option字段中携带主备 AC地址, 其中主 AC地址在备 AC地址之前, AP通过解析 AC回复的 offer 4艮文得到主备 AC地址;
步骤 203: AP同时向两个 AC地址发起 Discover报文;
步骤 204: 主备 AC分别响应该 AP发送的 Discover报文;
步骤 205: AP收到两个 AC回复的响应后, 根据 option字段中的 AC地 址顺序, 优先向第一个 AC地址发起 join请求, 请求注册主 AC;
步骤 206: AP成功注册第一个 AC即主 AC后, 主 AC下发相应的无线 接口配置信息和隧道接口配置信息给该 AP;
步骤 207: STA关联该 AP, 通过本地转发模式获取地址, 业务正常; 步骤 208 , 用户通过 AP接入主 AC后, 主备 AC通过心跳检测和 VRRP 同步以下信息: AP地址信息、 路由表信息;
由于用户使用的业务不同, 因此主备 AC同步的内容也有所不同。
步骤 209: AP与主 AC之间的网络链路断开, 在 AP与主 AC的若干次 链路定时保活失败后, AP向备 AC发起 Discover请求, 备 AC回复响应; 优选地, 该 AP在向备 AC发起 Discover 的同时还可向主 AC发起 Discover。
步骤 210: 该 AP向备 AC发送携带特定标志位的 join请求。
注册备 AC后, 该 AP延续使用原无线接口配置, 业务不会中断。
实施例 3
在本实施例中, AP和 AC正确组网后, 在主备 AC预先设置好 AP分组 及 WLAN配置参数, 主备 AC之间通过心跳检测进行状态 (包括 AC状态和 接口状态)判断。 在支持 option字段配置的外置 DHCP服务器中按设置主备 AC地址, 其中第一个 AC地址为主 AC的地址, 第二个 AC地址为备 AC的 地址。 在本实施例中 AP从支持 option字段配置的外置 DHCP服务器获取主 备 AC地址, 流程图如 3所示, 包括以下步骤:
步骤 301 : AP向 DHCP服务器发起 Discover报文, 请求获取地址, 解析
9 181203249 DHCP服务器回复的 offer报文中的相关 option字段, 得到主备 AC地址; 步骤 302: AP同时向两个 AC地址发起 Discover请求;
步骤 303: AP收到两个 AC回复的响应后, 根据 option字段中的 AC地 址顺序, 优先向第一个主 AC地址发起 join请求, 请求注册主 AC;
步骤 304: AP成功注册主 AC后, 主 AC下发相应的无线接口配置信息 和隧道接口配置信息。
用户关联该 AP, 使用不同业务通过 AP与主 AC交互, 以及主备 AC切 换过程与实施例 1和实施例 2相同, 此处不再赘述。
Option字段中主 AC地址位于备 AC地址之前仅为一种实施方式, 在其 他实施例中也可以釆用其他顺序,只要存储主备 AC地址的设备与 AP约定好 即可。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
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 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。
工业实用性 本发明实施例实现了主备 AC的热备切换, 避免 STA用户业务中断。 另 外, 两套 AC设备可以共存在同一个 ACTA机框中, 两个 AC的 AP管理板可 以配置不同地址, 使用更加灵活。 同时由于两套 AC设备可以同时共存在网 络中, 还便于 WEB页面访问和网管数据釆集。
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Claims

权 利 要 求 书
1、 一种无线接入控制器(AC )切换方法, 包括:
无线接入点 ( AP )获取第一 AC和第二 AC的地址信息, 所述 AP成功 注册第一 AC后, 从第一 AC获取无线接口配置信息和隧道接口配置信息; 当 AP与第一 AC之间的网络链路断开后, 向第二 AC发起注册, 从第二
AC获取新的隧道接口配置信息,使用之前获取的无线接口配置信息和从第二 AC获取新的隧道接口配置信息实现用户业务。
2、 如权利要求 1所述的方法, 其中,
所述 AP获取第一 AC和第二 AC的地址信息, 包括:
AP向存储有主备 AC地址的设备发送请求获取 AC地址的请求消息, 所 述存储有主备 AC地址的设备在向 AP回复的响应报文中携带第一 AC和第二 AC的地址,所述 AP通过解析响应报文获取第一 AC和第二 AC的地址信息。
3、 如权利要求 2所述的方法, 其中, 或与该 AP组网的 AC。
4、 如权利要求 2或 3所述的方法, 其中,
所述第一 AC和第二 AC的地址位于所述响应报文的可选( option )字段 中。
5、 如权利要求 4所述的方法, 其中,
在所述 option字段中,作为主 AC的 AC地址写在作为备 AC的 AC地址 的前面。
6、 如权利要求 1所述的方法, 其中,
所述向第二 AC发起注册, 从第二 AC获取新的隧道接口配置信息, 包 括:
所述 AP向第二 AC发起加入请求,并在请求中携带一特定标志位, 所述 第二 AC收到携带特定标志位的加入请求后,向所述 AP下发新的隧道接口配 置信息, 不向所述 AP下发无线接口配置信息。
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7、 如权利要求 1所述的方法, 其中,
所述 AP从第一 AC获取无线接口配置信息和隧道接口配置信息后,所述 方法还包括:
用户关联 AP, 所述用户的业务为集中隧道转发模式时, 所述第一 AC定 期同步以下信息到第二 AC 上: 用户信息、 地址解析协议(arp )信息、 AP 地址信息、 认证信息、 路由表信息; 或者
用户关联 AP, 所述用户的业务为本地转发模式时, 所述第一 AC定期同 步以下信息到第二 AC上: AP地址信息、 路由表信息。
8、 如权利要求 1所述的方法, 其中,
当 AP与第一 AC之间的网络链路断开后, 所述方法还包括: 所述 AP分 别向第一 AC和第二 AC发起发现请求, 待第二 AC回复响应后, 再向第二 AC发起注册。
9、 一种实现无线接入控制器(AC )切换的无线接入点 (AP ) , 包括信 息获取模块、 注册模块和业务模块, 其中:
所述信息获取模块设置为: 获取第一 AC和第二 AC的地址信息, 以及 在所述 AP成功注册第一 AC后,从第一 AC获取无线接口配置信息和隧道接 口配置信息;
所述注册模块设置为: 当所述 AP与第一 AC之间的网络链路断开后, 向 第二 AC发起注册, 从第二 AC获取新的隧道接口配置信息;
所述业务模块设置为: 使用所述信息获取模块获取的无线接口配置信息 和所述注册模块从第二 AC获取新的隧道接口配置信息实现用户业务。
10、 如权利要求 9所述的 AP , 其中,
所述信息获取模块是设置为: 釆用以下方式获取第一 AC和第二 AC的 地址信息:
所述信息获取模块向存储有主备 AC地址的设备发送请求获取 AC地址 的请求消息, 接收所述存储有主备 AC地址的设备回复的响应报文, 解析所 述响应报文, 获取第一 AC和第二 AC的地址信息。
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11、 如权利要求 10所述的 AP, 其中, 或与该 AP组网的 AC。
12、 如权利要求 9所述的 AP, 其中,
所述注册模块是设置为: 釆用以下方式向第二 AC发起注册, 从第二 AC 获取新的隧道接口配置信息:
所述注册模块向第二 AC发起加入请求, 并在请求中携带一特定标志位, 接收所述第二 AC向所述 AP下发新的隧道接口配置信息。
13、 如权利要求 9所述的 AP, 其中,
所述注册模块还设置为: 当 AP与第一 AC之间的网络链路断开后,分别 向第一 AC和第二 AC发起发现请求, 待第二 AC回复响应后, 向第二 AC发 起注册。
13 181203249
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