CN105072605B - Terminal roaming method under AP stand-alone modes and AP - Google Patents

Terminal roaming method under AP stand-alone modes and AP Download PDF

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CN105072605B
CN105072605B CN201510509235.8A CN201510509235A CN105072605B CN 105072605 B CN105072605 B CN 105072605B CN 201510509235 A CN201510509235 A CN 201510509235A CN 105072605 B CN105072605 B CN 105072605B
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roaming
sta
address
entry
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CN105072605A (en
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沈训君
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Beijing Star Net Ruijie Networks Co Ltd
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Beijing Star Net Ruijie Networks Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • 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]

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

An embodiment of the present invention provides the STA loaming methods and AP under a kind of AP stand-alone modes, this method includes that the first AP receives the re-association message that STA is sent；According to the MAC Address of STA in re-association message, the roaming list item that whether there is STA in local roaming list item is inquired；When there is no according to the facility information table that the OLD BSSID Field Inquiries in the re-association message are locally stored, obtain corresponding 2nd AP of the OLD BSSID fields, roam-requests message is sent to the 2nd AP；When the roaming success confirmation message for receiving the 2nd AP and replying, generates the roaming list item of the STA and be associated with list item.Terminal roaming method under AP stand-alone modes provided in an embodiment of the present invention and AP, when AC exceptions, AP works in the independent mode, realizes the roaming between AP, reduces the realization time of roaming, improve the reliability of data connection.

Description

Terminal roaming method under AP independent mode and AP
Technical Field
The present invention relates to the field of wireless communication, and in particular, to a terminal (Station, STA) roaming method in an Access Point (AP) independent mode and an AP.
Background
A Wireless Local Area Network (WLAN) includes two WLAN architectures, a fat AP architecture and a thin AP architecture. The fat AP architecture is a distributed structure taking fat APs as cores, the APs are managed one by one, and the overall management of the whole network flow, radio frequency and user distribution cannot be performed, so that the market application is less, and the large-scale network coverage requirement cannot be met. In the thin AP architecture, a wireless Controller (AC) centrally controls all subordinate APs through a wired network, so as to implement centralized planning and deployment of a wireless network, and the AC completes centralized management of all APs, including security Access control of wireless users.
In the thin AP architecture of the WLAN, the AC serves as a core device of the WLAN and takes charge of controlling and managing all subordinate APs and STAs. Thus, the AC becomes a single point of failure for the entire wireless network. Once the AC fails or the link between the AC And the AP fails to cause the Control And Configuration (CAPWAP) tunnel of the Wireless access point to be disconnected, all the APs managed by the AC will fail, And the Wireless network cannot continue to provide external services. Therefore, RIPT (edge awareness) techniques have been proposed on the basis of the thin AP architecture. The basic principle is that when the tunnel connection between the AC and the AP is normal, the AP works in a connection mode, the AC is responsible for user access, and the AP is responsible for data forwarding; when the AP and the AC tunnel are disconnected, the AP works in an independent mode, and the AP is responsible for user access and data forwarding work; if the connection is restored, the AP switches back to connected mode. The technology is generally applied to a general division network with an AC at headquarters and an AP at each branch office at present, and solves the problem of network interruption caused by unstable links between the AC/APs due to the fact that the AC/APs are connected across a wide area network.
However, in the WLAN thin AP architecture, roaming of STAs among APs is centrally controlled by the AC, so even if the RIPT technology is used, the AP can continue to forward data to the STAs even if the AC is abnormally disconnected. However, if the STA moves among a plurality of APs, the STA cannot roam among the APs because of no centralized control of the AC.
Disclosure of Invention
The embodiment of the invention provides a terminal roaming method in an AP independent mode and an AP.
The invention provides the following scheme:
a terminal STA roaming method under a wireless access point AP independent mode comprises the following steps:
a first AP receives a re-association message sent by an STA;
inquiring whether a roaming list item of the STA exists in a local roaming list item according to the MAC address of the STA in the re-association message;
when no roaming list item of the STA exists, inquiring a locally stored equipment information table according to an OLD BSSID field in the re-association message to obtain a second AP corresponding to the OLD BSSID field, and sending a roaming request message to the second AP;
when a successful roaming confirmation message replied by the second AP is received, generating a roaming list item and an associated list item of the STA, wherein the roaming type in the roaming list item of the STA is an access type, the IP address of the access point is the IP address of the first AP, and the IP address of the access point is the IP address of the second AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
A STA roaming method in an AP independent mode comprises the following steps:
the fifth AP receives a roaming request message sent by the sixth AP;
inquiring whether a roaming list item of the STA exists in a local roaming list item according to the MAC address of the STA in the roaming request message;
when no roaming list item of the STA exists, inquiring a local association list item;
when the association table entry of the STA is inquired from the local association table entry, generating a roaming table entry of the STA, and deleting the association table entry of the STA, wherein the roaming type in the roaming table entry of the STA is an overflow type, the IP address of an overflow AP is the IP address of a fifth AP, and the IP address of an overflow AP is the IP address of a sixth AP;
replying a roaming success confirmation message to the sixth AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
A wireless access point, AP, the AP being a first AP, comprising: the first message receiving unit, the first roaming processing unit and the first table item generating unit; wherein,
the first message receiving unit is used for receiving a re-association message sent by the STA;
the first roaming processing unit is configured to query whether a roaming entry of the STA exists in a local roaming entry according to the MAC address of the STA in the re-association; when no roaming list item of the STA exists, inquiring a locally stored equipment information table according to an OLD BSSID field in the re-association message to obtain a second AP corresponding to the OLD BSSID field, and sending a roaming request message to the second AP;
the first table generation unit is configured to generate a roaming table and an associated table of the STA when receiving a roaming success confirmation message returned by the second AP, where a roaming type in the roaming table of the STA is an roaming type, an IP address of the roaming AP is an IP address of the first AP, and an IP address of the roaming AP is an IP address of the second AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
An AP, the AP being a fifth AP, comprising: a fifth message receiving unit, a fifth roaming processing unit and a fifth table item generating unit; wherein,
the fifth message receiving unit is configured to receive a roaming request message sent by a sixth AP;
the fifth roaming processing unit is configured to query whether a roaming entry of the STA exists in a local roaming entry according to the MAC address of the STA in the roaming request message; when no roaming list item of the STA exists, inquiring a local association list item; the roaming success confirmation message is also used for replying to the sixth AP when the roaming list item of the STA exists in the local roaming list item and the roaming list item is in the roaming type;
the fifth table generation unit is configured to generate a roaming table of the STA and delete an association table of the STA when the association table of the STA is queried in a local association table, where a roaming type in the roaming table of the STA is an egress type, an IP address of an egress AP is an IP address of a fifth AP, and an IP address of an ingress AP is an IP address of a sixth AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
It can be seen from the above technical solutions provided in the embodiments of the present invention that, in the terminal roaming method in the AP independent mode and the AP provided in the embodiments of the present invention, when the AC is abnormal, the AP works in the independent mode, receives the re-association message of the STA, and queries whether the roaming table entry of the STA exists in the local roaming table entry, if the roaming table entry does not exist, sends a roaming request message to the AP corresponding to the oldsid in the re-association message, and after receiving the successful roaming confirmation message, generates the roaming table entry of the STA for use when the STA is subsequently re-associated, the STA does not need to acquire an IP address again, thereby implementing roaming between APs, reducing the implementation time of roaming, and improving the reliability of data connection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a second embodiment of the present invention;
fig. 3 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a third embodiment of the present invention;
fig. 4 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a fourth embodiment of the present invention;
fig. 5 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a fifth embodiment of the present invention;
fig. 6 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a sixth embodiment of the present invention;
fig. 7 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a seventh embodiment of the present invention;
fig. 8 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to an eighth embodiment of the present invention;
fig. 9 is a schematic structural diagram of an AP according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an AP according to a second embodiment of the present invention.
Detailed Description
First, the following explanation is made on the terms used in the embodiments of the present invention:
and (4) roaming in the AP: in the roaming action, the AP newly accessed by the STA is the roaming AP, and if the STA roams from the AP1 to the AP2, the AP2 is the roaming AP;
and (4) roaming out of the AP: in the roaming action, the AP originally associated with the STA is the roaming AP, and if the STA roams from the AP1 to the AP2, the AP1 is the roaming AP; if the STA roams from AP1 to AP2 and then from AP2 to AP3, the STA still takes AP1 as the roaming-out AP;
roaming type: a roaming entry for distinguishing whether to roam into the AP or to roam out of the AP, including a roaming entry type (RIC) and a roaming exit type (ROC); the roaming type of the roaming list item overflowing into the AP is recorded as RIC, and the roaming type of the roaming list item overflowing out of the AP is recorded as ROC;
device information table: for recording the relevant information of the AP. After the AP is on-line, generating device information entries on the AC, where each device information entry may include an Identifier of the on-line AP (an MAC address of the AP may be used here), a Service Set Identifier (SSID), a Basic Service Set Identifier (BSSID), IP, and VLAN information;
roaming list item: the system comprises a data acquisition module, a data storage module, a data transmission module and a data transmission module, wherein the data acquisition module is used for recording relevant information of an Access Point (AP) roaming, an Access Point (AP) roaming and a Virtual Local Area Network (VLAN) before and after roaming of an STA, at least comprises an MAC address of the STA, a roaming type, an IP address of the AP roaming and an IP address of the AP roaming out, and also comprises the VLAN;
and (3) roaming encapsulation: before forwarding a data message of STA or a message used for roaming management control between two APs to an opposite AP, sequentially encapsulating UDP (user Datagram protocol) and IP (Internet protocol) layers on the outer layer of the message content; the source and destination ports in the UDP layer still use the 5249 port currently used in roaming, and the IP layer uses the IP address of the roaming AP and the IP address of the roaming AP in the roaming table entry.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
Fig. 1 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a first embodiment of the present invention, where as shown in fig. 1, an execution subject of the first embodiment is a first AP, and the method includes the following steps:
step 101, a first AP receives a re-association message sent by an STA;
step 102, inquiring whether a roaming list item of the STA exists in a local roaming list item according to the MAC address of the STA in the re-association message;
step 103, when no roaming table entry of the STA exists, querying a locally stored device information table according to an OLD BSSID field in the re-association message to obtain a second AP corresponding to the OLD BSSID field, and sending a roaming request message to the second AP;
here, the re-association packet includes an OLD BSSID field, and the OLD BSSID field is used to represent the BSSID of the AP that the STA accesses last time.
Step 104, when receiving a roaming success confirmation message replied by the second AP, generating a roaming table entry and an associated table entry of the STA, where a roaming type in the roaming table entry of the STA is an roaming type, an IP address of the roaming AP is an IP address of the first AP, and an IP address of the roaming AP is an IP address of the second AP;
here, the roaming entry includes a MAC address of the STA, a roaming type, an IP address of the roaming AP, and an IP address of the roaming AP, where the roaming type includes the roaming type and the roaming type.
Fig. 2 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a second embodiment of the present invention, where as shown in fig. 2, an execution main body of the second embodiment is a first AP, and the method includes:
step 201, a first AP establishes a connection with an AC, and receives a device information table sent by a wireless controller AC, where the device information table includes an MAC address, BSSID, and IP address of each AP accessing the AC;
here, when the AP establishes a tunnel with the AC, the AC generates a corresponding AP device information entry. And meanwhile, the AC searches the equipment information table by taking the SSID as an index, sends the newly generated equipment information table to other searched APs, and sends the searched equipment information table to the AP which is just on line.
Specifically, the AP comes online: the AP online establishes a Control and configuration Protocol (CAPWAP) tunnel of a Wireless Access point (Wireless Access point Protocol) with the AC, the AP transmits corresponding signals (SSID, BSSID and VLAN) according to the configuration of the AC to the AP (SSID and VLAN configured on the AC), and meanwhile, the AP uploads the MAC address, BSSID and IP address information of the AP to the AC; the AC adds and generates an equipment information table item of the AP according to the configuration information (SSID and VLAN configured on the AC) of the AP and the AP MAC address, BSSID and IP address information uploaded by the AP; the AC searches the device information table item by taking the SSID as an index, sends the newly added device information table item to other searched APs, and simultaneously sends all the searched device information table items to the newly added AP; here, the message sent from the AC to the AP may follow the standard CAPWAP protocol, which is not described again; after the AP receives the equipment information table item issued by the AC, the AP also generates a corresponding equipment information table item;
AP offline: when the AC detects that the AP address is offline, the equipment information table entry on the AC is indexed according to the MAC address of the offline AP, and the equipment information table entry of the AP is deleted; simultaneously sending a notice for deleting the equipment information table item to other APs; after receiving the notice, other APs delete the corresponding equipment information table entry;
step 202, a first AP receives a re-association message sent by an STA;
step 203, inquiring whether a roaming list item of the STA exists in a local roaming list item according to the MAC address of the STA in the re-association message; when the roaming type is not the roaming type, executing step 204, and when the roaming type is the roaming type, executing step 205; when the roaming type exists and is the roaming type, execute step 207;
step 204, when no roaming list item of the STA exists, querying a locally stored device information table according to an OLD basic service set identifier (OLD) BSSID field in the re-association message to obtain a second Access Point (AP) corresponding to the OLD BSSID field, and sending a roaming request message to the second AP;
when receiving the roaming success confirmation message returned by the second AP, execute step 206, and when receiving the roaming redirection message returned by the second AP, execute step 209;
step 205, sending a roaming request message to a second AP corresponding to the IP address of the roaming AP in the roaming table entry of the STA, and executing step 206;
step 206, when receiving the roaming success confirmation message replied by the second AP, generating a roaming entry and an associated entry of the STA, where a roaming type in the roaming entry of the STA is an roaming type, an IP address of the roaming AP is an IP address of the first AP, and an IP address of the roaming AP is an IP address of the second AP; the current flow ends.
The roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
Step 207, sending a roaming deletion notification message to a third AP corresponding to the IP address of the roaming AP in the roaming list item of the STA; step 208 is executed;
and step 208, receiving the roaming deletion confirmation message returned by the third AP, deleting the roaming entry of the STA, generating an association entry of the STA, and ending the current process.
Step 209, when receiving the roaming redirection message returned by the second AP, acquiring an IP address of a fourth AP from the roaming redirection message, where the IP address of the fourth AP is an IP address of a roaming AP which roams out of the STA roaming entry in the local roaming entry of the second AP; step 210 is executed; the roaming redirection message is sent when the second AP receives the roaming request and inquires a roaming entry of the roaming type of the STA in a roaming entry of the second AP;
step 210, sending a roaming request message to the fourth AP; step 211 is executed;
step 211, receiving the roaming success confirmation message replied by the fourth AP, and generating the roaming entry and the association entry of the STA, where the roaming type in the roaming entry of the STA is an roaming type, the IP address of the roaming AP is the IP address of the first AP, the IP address of the roaming AP is the IP address of the fourth AP, and the current process is ended.
Fig. 3 is a flowchart illustrating an implementation of an STA roaming method in an AP independent mode according to a third embodiment of the present invention, as shown in fig. 3, an execution main body of the third embodiment is a fifth AP, and the method includes:
step 301, the fifth AP receives a roaming request message sent by the sixth AP;
step 302, inquiring whether a roaming list item of the STA exists in a local roaming list item according to the MAC address of the STA in the roaming request message; when no roaming list item of the STA exists, executing step 303; when the roaming list item of the STA exists and is a roaming type, executing step 306; when the roaming entry of the STA exists in the local roaming entry and the roaming entry is an egress type, execute step 305;
step 303, when no roaming list item of the STA exists, querying a local association list item;
step 304, when the association table entry of the STA is queried in the local association table entry, generating a roaming table entry of the STA, and deleting the association table entry of the STA, where the roaming type in the roaming table entry of the STA is an egress type, the IP address of an egress AP is the IP address of a fifth AP, and the IP address of an ingress AP is the IP address of a sixth AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
Step 305, replying a roaming success confirmation message to the sixth AP;
step 306, writing the IP address of the roaming AP in the roaming table entry of the STA into a roaming redirection packet, and deleting the roaming table entry and the associated table entry of the STA;
step 307, sending the roaming redirection packet to the sixth AP.
Fig. 4 is a flowchart of an implementation of an STA roaming method in an AP independent mode according to a fourth embodiment of the present invention, and as shown in fig. 4, a scenario described in the fourth embodiment is that an STA first comes online, an online AP is AP2 (a corresponding STA VLAN is 20), then the STA moves to an AP3 (a corresponding STA VLAN is 30), and sends a reassociation packet to an AP3, that is, the STA is originally associated with an AP2 and then moves to an AP3, where a specific process of roaming from the AP2 to the AP3 is as follows:
step 401, the STA moves to the AP3 and sends a re-association message to the AP 3;
step 402, the AP3 queries a local roaming entry according to the received MAC address of the STA in the re-association message sent by the STA;
step 403, the AP3 does not inquire the roaming list item of the STA in the roaming list item, then inquires the locally stored device information table according to the OLD BSSID field in the re-association message, and sends a roaming request message to the AP2 when inquiring the relevant information of the AP 2;
step 404, after receiving the roaming request message, the AP2 queries a local roaming list item according to the MAC address of the STA in the roaming request message;
step 405, if the AP2 does not inquire the roaming entry of the STA in the local roaming entry, it inquires the local association entry; the association table entry is used for recording the STA information initially accessed to the AP 2;
step 406, the AP2 queries the association table entry of the STA from the association table entries, and locally generates a roaming table entry with a roaming type of roaming out of the AP;
specifically, the entry content of the roaming entry of the STA may be: STA MAC, 20, ROC, AP3_ MAC, AP3_ IP, AP2_ MAC, AP2_ IP;
step 407, the AP2 replies a roaming success confirmation message to the AP 3;
step 408, the AP3 receives the roaming success confirmation message, and locally generates a roaming table entry of which the roaming type is the roaming type and an association table entry of the STA;
here, the entry content of the roaming entry may be: STA MAC, 20, RIC, AP3_ MAC, AP3_ IP, AP2_ MAC, AP2_ IP.
In addition, in step 406, if the AP2 does not inquire the association table entry of the STA in the association table entry, it replies a roaming failure confirmation message to the AP3, and after receiving the confirmation message, the AP3 directly generates the association table entry of the STA.
Fig. 5 is a flowchart illustrating an implementation of a STA roaming method in an AP independent mode according to a fifth embodiment of the present invention, as shown in fig. 5, a scenario described in the fifth embodiment is that a STA first comes online, an online AP is AP1 (corresponding to a STA VLAN is 10), and then the STA moves to AP2 (corresponding to a STA VLAN is 20) and successfully roams to AP 2. The STA then moves to AP3 (corresponding to a STAVLAN of 30) and sends a reassociation message to AP 3. Here, when the STA roams to the AP2, corresponding roaming entries are generated in the AP1 and the AP2, respectively, where the entry content of the roaming entry in the AP1 may be: STA MAC, 10, ROC, AP2_ MAC, AP2_ IP, AP1_ MAC, AP1_ IP; the entry content of the roaming entry at the AP2 may be: STA MAC, 10, RIC, AP2_ MAC, AP2_ IP, AP1_ MAC, AP1_ IP; the specific generation process refers to the implementation flow of the fourth embodiment, and the fifth embodiment includes:
step 501, the STA moves to the AP3 and sends a re-association message to the AP 3;
step 502, the AP3 queries a local roaming entry according to the MAC address of the STA in the re-association message;
step 503, the AP3 does not inquire the roaming list item of the STA in the roaming list item, inquires the locally stored device information table according to the OLD BSSID field in the re-association message, inquires the relevant information of the AP2 corresponding to the OLD BSSID field, and sends the roaming request message to the AP 2;
step 504, the AP2 receives the roaming request message, and queries a local roaming list item according to the MAC address of the STA in the roaming request message;
step 505, the AP2 queries the roaming table entry of the STA in the roaming table entry, and the roaming table entry is a roaming type, fills the information of the roaming AP (AP1) in the roaming table entry of the STA into the roaming redirection packet, and deletes the roaming table entry and the associated table entry of the STA;
step 506, the AP2 sends a roaming redirection message to the AP 3;
in step 507, after receiving the roaming redirection message of AP2, AP3 obtains the information of the initial roaming out AP (AP1) from the roaming redirection message;
step 508, the AP3 sends a roaming request message to the AP 1;
step 508, after receiving the roaming request message, the AP1 queries a local roaming list item; when the roaming table entry of the STA is queried, step 509 is executed, otherwise, the operation may be performed with reference to step 405 in the fourth embodiment.
In step 509, the AP1 queries the roaming entry of the STA from the local roaming entries, and modifies the roaming entry of the STA according to the information in the roaming request message, where the modified roaming entry is: STA MAC, 10, ROC, AP3_ MAC, AP3_ IP, AP1_ MAC, AP1_ IP;
step 510, the AP1 sends a roaming success confirmation message to the AP 3;
step 511, after receiving the successful roaming confirmation message, the AP3 locally generates a roaming table entry and an associated table entry of the corresponding STA;
here, the entry content of the roaming entry of the STA is: STA MAC, 10, RIC, AP3_ MAC, AP3_ IP, AP1_ MAC, AP1_ IP.
Fig. 6 is a flowchart of an implementation of an STA roaming method in an AP independent mode according to a sixth embodiment of the present invention, and as shown in fig. 6, a scenario described in the sixth embodiment is: the STA comes online for the first time, and the online AP is AP3 (the corresponding STA VLAN is 30). The STA then moves to AP2 and successfully roams to AP2 (corresponding STA VLAN of 20). The STA then moves back to AP3 (corresponding STA VLAN is 30) and sends a reassociation message to AP 3. Here, when the STA roams to the AP2, corresponding roaming entries are generated in the AP3 and the AP2, respectively, where the entry contents of the roaming entry in the AP3 are: the table entry contents of the roaming table entry on the AP2 include: STA MAC, 30, RIC, AP2_ MAC, AP2_ IP, AP3_ MAC, AP3_ IP; the specific generation process refers to example four.
601, the STA moves to the AP3 and sends a re-association message to the AP 3;
step 602, the AP3 queries a local roaming entry according to the MAC address of the STA of the re-association packet;
step 603, the AP3 queries the roaming table entry of the STA from the local roaming table entries, and the roaming type of the roaming table entry is an roaming-out type;
step 604, the AP3 sends a roaming deletion notification message to the AP2 according to the information that the AP (AP2) is roamed into the roaming list item of the STA;
step 605, the AP2 receives the roaming deletion notification message, and deletes the local roaming table entry and the associated table entry of the STA;
step 606, the AP2 replies a roaming deletion confirmation message to the AP3 to confirm that the entry of the STA has been deleted;
in step 607, the AP3 receives the roaming deletion confirmation message, deletes the roaming table entry of the STA, and then directly generates the association table entry of the STA.
In addition, in the embodiment of the invention, the roaming AP sends roaming keep-alive inquiry messages to the roaming AP at preset time intervals so as to confirm whether the roaming AP is online or not; and after the roaming packet alive query message is received by the roaming AP, responding to a roaming packet alive confirmation message. Here, the predetermined time interval may be 10 seconds. Under abnormal conditions, if the roaming AP continuously sends 3 roaming keep-alive query messages and does not receive confirmation of response, the AP at the opposite end is considered to be disconnected, and the roaming table entry is deleted. Similarly, if the roaming keep-alive query message of the opposite end is not received by the roaming AP for 3 times continuously, the AP of the opposite end is considered to be disconnected, and the roaming table entry is deleted.
Fig. 7 and 8 are flowcharts of implementing an STA roaming method in an AP independent mode according to seventh and eighth embodiments of the present invention, where as shown in the drawings, the seventh and eighth embodiments mainly describe a roaming table entry based on an AP itself, and an STA performs a roaming packet sending process between APs, and sends all uplink data packets of the STA to an egress AP for forwarding after roaming and encapsulating by the egress AP; all downlink data messages are sent to the roaming AP for forwarding after being subjected to roaming encapsulation by the roaming AP;
here illustrated by STA roaming from AP1 to AP2, where STA VLAN for AP1 is 10 and STA VLAN for AP2 is 20. After roaming, corresponding roaming entries are generated on AP1 and AP2 according to the previous scene analysis, and there is an association entry of the STA on AP 2:
wherein, the entry content of the roaming entry in the AP1 is: STA MAC, 10, ROC, AP2_ MAC, AP2_ IP, AP1_ MAC, AP1_ IP; the entry content of the roaming entry in the AP2 is: STA MAC, 20, RIC, AP2_ MAC, AP2_ IP, AP1_ MAC, AP1_ IP.
For the uplink data message of the STA, as shown in fig. 7, the procedure is as follows:
step 701, after receiving the 802.11 message of the STA from the air interface, the flooding AP converts the message into an 802.3 format.
Step 702, the roaming-in AP queries the local roaming entry and matches it to the roaming entry, and then performs roaming encapsulation according to the roaming entry.
The encapsulated destination IP is the IP address of the roaming AP, the source IP is the IP address of the AP itself, and the source port and the destination port of the UDP are all 5249.
Step 703, sending the encapsulated message to the roaming AP.
Step 704, after the roaming-out AP receives the message, decapsulating CAPWAP, that is, decapsulating the outer header encapsulated on the roaming-out AP, marking the STA with a corresponding VLAN tag (VLAN 10) according to the VLAN information in the roaming entry, and forwarding the decapsulated message through the wired port.
For the downlink data message of the STA, as shown in fig. 8, the procedure is as follows:
step 801, after receiving an 802.3 message sent to the STA from the wired port, the roaming entry is queried and matched with the roaming entry by the roaming AP, and the STA is subjected to roaming encapsulation according to the information of the roaming entry.
The encapsulated destination IP is the IP address of the flooding AP, the source IP is the IP address of the AP itself, and the source port and the destination port of the UDP are all 5249.
And step 802, packaging the message and then sending the message to the flooding AP.
Step 803, the flooding-in AP decapsulates the message after receiving the message, queries the association table entry of the STA according to the MAC address of the STA after decapsulation, converts the message from the 802.3 format to the 802.11 format, and sends the message to the STA through the corresponding radio port.
Fig. 9 is a schematic structural diagram of an AP provided in an embodiment of the present invention, and as shown in fig. 9, the AP is a first AP and includes: a first message receiving unit 91, a first roaming processing unit 92, and a first table entry generating unit 93; wherein,
the first packet receiving unit 91 is configured to receive a re-association packet sent by an STA;
the first roaming processing unit 92 is configured to query whether a roaming entry of the STA exists in a local roaming entry according to the MAC address of the STA in the re-association; when no roaming list item of the STA exists, inquiring a locally stored equipment information table according to an OLD BSSID field in the re-association message to obtain a second AP corresponding to the OLD BSSID field, and sending a roaming request message to the second AP;
the first table generation unit 93 is configured to generate a roaming table and an association table of the STA when receiving the roaming success confirmation message returned by the second AP, where a roaming type in the roaming table of the STA is an roaming type, an IP address of the roaming AP is an IP address of the first AP, and an IP address of the roaming AP is an IP address of the second AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
Optionally, the AP further includes: a first connection unit 90, configured to establish a connection with an AC, and receive the device information table sent by the AC, where the device information table includes a MAC address, BSSID, and IP address of each AP accessing the AC.
Optionally, the first roaming processing unit 92 is further configured to send a roaming request packet to a second AP corresponding to an IP address of an AP which roams out of the roaming table entry of the STA when it is found that the roaming table entry of the STA exists in the roaming table entries of the local area and the roaming type of the roaming table entry is the roaming type.
Optionally, the first roaming processing unit 92 is further configured to send a roaming deletion notification message to a third AP corresponding to an IP address of a roaming-in AP in a roaming entry of the STA when it is found that the roaming entry of the STA exists in a local roaming entry and the roaming type of the roaming entry is a roaming-out type;
the first entry generating unit 93 is further configured to delete the roaming entry of the STA and generate the association entry of the STA when receiving the roaming deletion confirmation message returned by the third AP.
Optionally, the first roaming processing unit 92 is further configured to, when receiving a roaming redirection packet returned by the second AP, obtain an IP address of a fourth AP from the roaming redirection packet, where the IP address of the fourth AP is an IP address of an AP which is roamed out of the roaming entry of the STA in the roaming entry of the second AP; the roaming redirection message is sent when the second AP receives the roaming request and inquires a roaming entry of the roaming type of the STA in a roaming entry of the second AP; sending a roaming request message to the fourth AP;
the first entry generating unit 93 is further configured to generate a roaming entry and an associated entry of the STA when receiving the roaming success confirmation message returned by the fourth AP, where a roaming type in the roaming entry of the STA is an roaming type, an IP address of the roaming AP is an IP address of the first AP, and an IP address of the roaming AP is an IP address of the fourth AP.
It should be understood that the implementation principle and process of the AP provided in the embodiment of the present invention are similar to the implementation processes of the corresponding methods of the first AP in the embodiment shown in fig. 1-2 and the APs in fig. 4-8, and are not described herein again.
An embodiment of the present invention further provides an AP, where the structure of the AP refers to fig. 10, and the AP is a fifth AP, and specifically includes: a fifth message receiving unit 1001, a fifth roaming processing unit 1002, and a fifth table entry generating unit 1003; wherein,
the fifth message receiving unit 1001 is configured to receive a roaming request message sent by a sixth AP;
the fifth roaming processing unit 1002 is configured to query whether a roaming entry of the STA exists in a local roaming entry according to the MAC address of the STA in the roaming request message; when no roaming list item of the STA exists, inquiring a local association list item; the roaming success confirmation message is also used for replying to the sixth AP when the roaming list item of the STA exists in the local roaming list item and the roaming list item is in the roaming type;
the fifth table entry generating unit 1003 is configured to generate a roaming table entry of the STA and delete an association table entry of the STA when the association table entry of the STA is queried in a local association table entry, where a roaming type in the roaming table entry of the STA is a roaming-out type, an IP address of a roaming-out AP is an IP address of a fifth AP, and an IP address of a roaming-in AP is an IP address of a sixth AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
Optionally, the fifth roaming processing unit 1002 is further configured to, when it is found that a roaming entry of the STA exists in the local roaming entries and the roaming entry is an entry type, write an IP address of an exit AP in the roaming entry of the STA into a roaming redirection packet, and send the roaming redirection packet to the sixth AP;
the fifth table entry generating unit 1003 is further configured to delete the roaming table entry and the association table entry of the STA when the roaming processing unit queries that the roaming table entry of the STA exists in the local roaming table entries and the roaming table entry is the roaming type.
It should be understood that the principle and process of implementing the AP provided in the embodiment of the present invention are similar to the fifth AP in the embodiment shown in fig. 3 and the process of implementing the AP in fig. 4 to fig. 8, and are not described herein again.
The terminal roaming method and the AP under the AP independent mode provided by the embodiment of the invention can receive the re-association message of the STA when the AC is abnormal and the AP works under the independent mode, and generate the roaming list item of the STA for use when the STA is subsequently re-associated by inquiring whether the roaming list item of the STA exists in the local roaming list item or not and sending the roaming request message to the AP corresponding to the OLD BSSID in the re-association message if the roaming list item of the STA does not exist, and after receiving the successful roaming confirmation message, the STA does not need to acquire the IP address again, thereby realizing the roaming among the APs, reducing the implementation time of the roaming and improving the reliability of the data connection.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (14)

1. A terminal STA roaming method under a wireless access point AP independent mode is characterized by comprising the following steps:
a first AP receives a re-association message sent by an STA;
inquiring whether a roaming list item of the STA exists in a local roaming list item according to the MAC address of the STA in the re-association message;
when no roaming list item of the STA exists, inquiring a locally stored equipment information table according to an OLD BSSID field in the re-association message to obtain a second AP corresponding to the OLD BSSID field, and sending a roaming request message to the second AP;
when a successful roaming confirmation message replied by the second AP is received, generating a roaming list item and an associated list item of the STA, wherein the roaming type in the roaming list item of the STA is an access type, the IP address of the access point is the IP address of the first AP, and the IP address of the access point is the IP address of the second AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
2. The method of claim 1, further comprising:
the first AP establishes connection with a wireless controller (AC), and receives the equipment information table sent by the AC, wherein the equipment information table comprises the MAC address, BSSID and IP address of each AP accessing the AC.
3. The method according to claim 1, wherein before receiving the roaming success confirmation message returned by the second AP when the roaming entry of the STA exists in the local roaming entry and the roaming type of the roaming entry is the roaming type, the method further comprises:
and sending a roaming request message to a second AP corresponding to the IP address of the roaming AP in the roaming list item of the STA.
4. The method of claim 1, wherein when the roaming entry of the STA exists in a local roaming entry and the roaming type of the roaming entry is a roaming-out type, the method comprises:
sending a roaming deletion notification message to a third AP corresponding to the IP address of the roaming AP in the roaming list item of the STA;
and receiving a roaming deletion confirmation message replied by the third AP, deleting the roaming table entry of the STA, and generating an association table entry of the STA.
5. The method of claim 1, further comprising:
when a roaming redirection message replied by the second AP is received, acquiring an IP address of a fourth AP from the roaming redirection message, wherein the IP address of the fourth AP is the IP address of a roaming AP out of the roaming list items of the STA in the local roaming list items of the second AP; the roaming redirection message is sent when the second AP receives the roaming request and inquires a roaming entry of the roaming type of the STA in a roaming entry of the second AP;
sending a roaming request message to the fourth AP;
and receiving a roaming success confirmation message replied by the fourth AP, and generating a roaming list item and an associated list item of the STA, wherein the roaming type in the roaming list item of the STA is a roaming type, the IP address of the roaming AP is the IP address of the first AP, and the IP address of the roaming AP is the IP address of the fourth AP.
6. A method for STA roaming in AP-independent mode, comprising:
the fifth AP receives a roaming request message sent by the sixth AP;
inquiring whether a roaming list item of the STA exists in a local roaming list item according to the MAC address of the STA in the roaming request message;
when no roaming list item of the STA exists, inquiring a local association list item;
when the association table entry of the STA is inquired from the local association table entry, generating a roaming table entry of the STA, and deleting the association table entry of the STA, wherein the roaming type in the roaming table entry of the STA is an overflow type, the IP address of an overflow AP is the IP address of a fifth AP, and the IP address of an overflow AP is the IP address of a sixth AP;
replying a roaming success confirmation message to the sixth AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
7. The method of claim 6, wherein when the roaming entry for the STA exists and the roaming entry is of a roaming type, the method further comprises:
writing the IP address of the roaming AP in the roaming list item of the STA into a roaming redirection message, and deleting the roaming list item and the associated list item of the STA;
and sending the roaming redirection message to the sixth AP.
8. A wireless Access Point (AP), wherein the AP is a first AP, comprising: the first message receiving unit, the first roaming processing unit and the first table item generating unit; wherein,
the first message receiving unit is used for receiving a re-association message sent by the STA;
the first roaming processing unit is configured to query whether a roaming entry of the STA exists in a local roaming entry according to the MAC address of the STA in the re-association; when no roaming list item of the STA exists, inquiring a locally stored equipment information table according to an OLD BSSID field in the re-association message to obtain a second AP corresponding to the OLD BSSID field, and sending a roaming request message to the second AP;
the first table generation unit is configured to generate a roaming table and an associated table of the STA when receiving a roaming success confirmation message returned by the second AP, where a roaming type in the roaming table of the STA is an roaming type, an IP address of the roaming AP is an IP address of the first AP, and an IP address of the roaming AP is an IP address of the second AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
9. The AP of claim 8, further comprising: the first connection unit is used for establishing connection with the AC and receiving the equipment information table sent by the AC, wherein the equipment information table comprises the MAC address, BSSID and IP address of each AP accessing the AC.
10. The AP of claim 8, wherein the first roaming processing unit is further configured to send a roaming request packet to a second AP corresponding to an IP address of an AP which roams out of the roaming table entry of the STA when it is found that the roaming table entry of the STA exists in the roaming table entries of the local area and the roaming type of the roaming table entry is a roaming type.
11. The AP of claim 8, wherein the first roaming processing unit is further configured to send a roaming deletion notification message to a third AP corresponding to an IP address of a roaming-in AP in a roaming entry of the STA when it is found that the roaming entry of the STA exists in a local roaming entry and a roaming type of the roaming entry is an roaming-out type;
the first table entry generating unit is further configured to delete the roaming table entry of the STA and generate the association table entry of the STA when receiving the roaming deletion confirmation message returned by the third AP.
12. The AP of claim 8, wherein the first roaming processing unit is further configured to, when receiving a roaming redirection packet returned by the second AP, obtain an IP address of a fourth AP from the roaming redirection packet, where the IP address of the fourth AP is an IP address of a roaming AP that roams out of a roaming entry of the STA in a roaming entry local to the second AP; the roaming redirection message is sent when the second AP receives the roaming request and inquires a roaming entry of the roaming type of the STA in a roaming entry of the second AP; sending a roaming request message to the fourth AP;
the first table generation unit is further configured to generate a roaming table and an associated table of the STA when receiving the roaming success confirmation message returned by the fourth AP, where a roaming type in the roaming table of the STA is an roaming type, an IP address of the roaming AP is an IP address of the first AP, and an IP address of the roaming AP is an IP address of the fourth AP.
13. An AP, wherein the AP is a fifth AP, comprising: a fifth message receiving unit, a fifth roaming processing unit and a fifth table item generating unit; wherein,
the fifth message receiving unit is configured to receive a roaming request message sent by a sixth AP;
the fifth roaming processing unit is configured to query whether a roaming entry of the STA exists in a local roaming entry according to the MAC address of the STA in the roaming request message; when no roaming list item of the STA exists, inquiring a local association list item; the roaming success confirmation message is also used for replying to the sixth AP when the roaming list item of the STA exists in the local roaming list item and the roaming list item is in the roaming type;
the fifth table generation unit is configured to generate a roaming table of the STA and delete an association table of the STA when the association table of the STA is queried in a local association table, where a roaming type in the roaming table of the STA is an egress type, an IP address of an egress AP is an IP address of a fifth AP, and an IP address of an ingress AP is an IP address of a sixth AP;
the roaming list item comprises an MAC address of an STA, a roaming type, an IP address of a roaming-in AP and an IP address of a roaming-out AP, and the roaming type comprises the roaming-in type and the roaming-out type.
14. The AP of claim 13, wherein the fifth roaming processing unit is further configured to, when it is found that a roaming entry of the STA exists in the local roaming entries and the roaming entry is a roaming type, write an IP address of an out-of-AP in the roaming entry of the STA into a roaming redirection packet, and send the roaming redirection packet to the sixth AP;
the fifth table entry generating unit is further configured to delete the roaming table entry and the association table entry of the STA when the roaming processing unit finds that the roaming table entry of the STA exists in the local roaming table entries and the roaming table entry is the roaming type.
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