CN103167471A - Method and device for transmitting data of client moving between different APs (access points) - Google Patents
Method and device for transmitting data of client moving between different APs (access points) Download PDFInfo
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- CN103167471A CN103167471A CN2013100807355A CN201310080735A CN103167471A CN 103167471 A CN103167471 A CN 103167471A CN 2013100807355 A CN2013100807355 A CN 2013100807355A CN 201310080735 A CN201310080735 A CN 201310080735A CN 103167471 A CN103167471 A CN 103167471A
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Abstract
The invention discloses a method and a device for transmitting data of client moving between different APs (access points). The method includes the steps: transmitting corresponding information of the client to a second AP through a first message by an AC (access controller) when the client moves from a first AP coverage area to a second AP coverage area and does not roam from a first AP to the second AP; replacing the BSSID (basic service set identification) of the second AP with the BSSID of the first AP and transmitting a second message to the AC; and transmitting the second message to the first AP after the AC receives the second message. The MAC (media access control) address of the second AP and the MAC address of the client are carried in the second message. The communication quality of the client can be improved, and wireless experience of a user is enhanced.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of client at different AP(Access Point, access point) between data transmission method and equipment when moving.
Background technology
As depicted in figs. 1 and 2, be WLAN(Wireless Local Area Network, WLAN (wireless local area network)) in, AC(Access Controller, access controller)+FIT(is thin) and the networking schematic diagram of AP, the STA(client) be connected to AC by AP; In the process of client access network, need at first seek available network, then determine to select which AP to be connected to AC from according to some factor (as signal strength signal intensity).
Due to the mobility of client, client may move by occurrence positions after successful connection, and as from position movement shown in Figure 1 to position shown in Figure 2, this moment, client was in the working range of AP C, but this client but is connected on AP A; In above-mentioned situation, if client is roamed (namely not roaming into AP C), and client continues to be connected on AP A, can cause the communication quality of client to be greatly affected, may there be the phenomenons such as a large amount of packet losses, re-transmission, and cause very poor wireless experience.
Summary of the invention
Data transmission method and equipment when the embodiment of the present invention provides a kind of client to move between different AP, with the communication quality of raising client, and raising user's wireless experience.
In order to achieve the above object, the data transmission method when embodiment of the present invention provides a kind of client to move between diverse access point AP, be applied to comprise in the WLAN (wireless local area network) WLAN of access controller AC, an AP, the 2nd AP and client, a described AP provides the AP of service for being initially described client, the method comprises:
Described AC utilizes described client to determine that at the received signal strength indicator RSSI under an AP and the RSSI under the 2nd AP described client moves to the 2nd AP overlay area by an AP overlay area;
When described client does not roam into described the 2nd AP from a described AP, described AC is by being used for notifying the 2nd AP to provide the first message of service that described client corresponding informance is sent to described the 2nd AP for client, and described client corresponding informance comprises: the medium access control MAC Address of described client, the MAC Address of a described AP, basic service set identification BSSID corresponding to described the above client of an AP; The BSSID that described the first message is used for making described the 2nd AP utilize described client corresponding informance replaces the BSSID of self, and utilizes the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP;
Described AC receives described the 2nd AP and notifies described the 2nd AP to provide the second message of service for described client to described AC being used for of sending, and carries the MAC Address of described the 2nd AP, the MAC Address of described client in described the second message;
Described AC sends to a described AP with described the second message after receiving described the second message; Described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to described the 2nd AP.
Described AC utilizes described client to determine that at the received signal strength indicator RSSI under an AP and the RSSI under the 2nd AP described client moves to the 2nd AP overlay area by an AP overlay area, specifically comprises:
Described AC obtains the RSSI of described client under the RSSI under an AP and the 2nd AP, RSSI under the one AP is the mean value of the RSSI of nearest N1 the record of a described AP, and the RSSI under the 2nd AP is the mean value of the RSSI of nearest N2 the record of described the 2nd AP;
When the difference of described client RSSI under the 2nd AP at the RSSI under an AP and described client during more than or equal to default RSSI thresholding, described AC determines that described client moves to described the 2nd AP overlay area by a described AP overlay area.
Before described AC sent to described the 2nd AP by the first message with described client corresponding informance, described method further comprised:
Whether described AC judges data re-transmission rate between a described AP and described client more than or equal to default retransmission rate thresholding, and whether described client was not carried out AP and switched within Preset Time;
If the data re-transmission rate is more than or equal to default retransmission rate thresholding, and do not carry out AP switch within Preset Time, described AC carries out the step that sends the first message to described the 2nd AP.
Described the 2nd AP utilizes the BSSID in described client corresponding informance to replace the BSSID of self, specifically comprises:
When the N bar BSSID of the corresponding radio frequency of described the 2nd AP was not replaced by the BSSID of other AP, described the 2nd AP utilized the BSSID of a described AP to replace the N bar BSSID of self;
When the N bar BSSID of the corresponding radio frequency of described the 2nd AP is replaced by the BSSID of other AP, and when the N-1 bar BSSID of the corresponding radio frequency of described the 2nd AP was not replaced by the BSSID of other AP, described the 2nd AP utilized the BSSID of a described AP to replace the N-1 bar BSSID of self;
By that analogy.
Be initially described client at a described AP when service is provided, described AC records the following corresponding relation of described client: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of a described AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time;
Described AC is after receiving described the second message, and the corresponding relation that upgrades described client is: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of described the 2nd AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time.
A described AP utilizes the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to the process of described the 2nd AP, specifically comprise: a described AP added the first heading before data, and the data that will carry the first heading send to described the 2nd AP, remove described the first heading by described the 2nd AP, and amended data are sent to described client; Wherein, the target MAC (Media Access Control) address of described the first heading is the MAC Address of described the 2nd AP, and source MAC is the MAC Address of a described AP;
Described the 2nd AP utilizes the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client the process of a described AP, specifically comprise: described the 2nd AP added the second heading before data, and the data that will carry the second heading send to a described AP, remove described the second heading by a described AP, and amended data are sent to destination device; Wherein, the target MAC (Media Access Control) address of described the second heading is the MAC Address of a described AP, and source MAC is the MAC Address of described the 2nd AP.
The embodiment of the present invention provides a kind of access controller AC, is applied to comprise that in the WLAN (wireless local area network) WLAN of described AC, the first access point AP, the 2nd AP and client, a described AP provides the AP of service for being initially described client, and described AC comprises:
Determination module is used for utilizing client to determine that at the received signal strength indicator RSSI under an AP and the RSSI under the 2nd AP client moves to the 2nd AP overlay area by an AP overlay area;
The first sending module, be used for moving to the 2nd AP overlay area and described client when not roaming into described the 2nd AP from a described AP when definite client by an AP overlay area, by being used for notifying the 2nd AP to provide the first message of service that described client corresponding informance is sent to described the 2nd AP for client, described client corresponding informance comprises: the medium access control MAC Address of described client, the MAC Address of a described AP, basic service set identification BSSID corresponding to described the above client of an AP; The BSSID that described the first message is used for making the 2nd AP utilize described client corresponding informance replaces the BSSID of self, and utilizes the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP;
Receiver module is used for receiving described the 2nd AP and notifies described the 2nd AP to provide the second message of service for described client to this AC being used for of sending, and carries the MAC Address of described the 2nd AP, the MAC Address of described client in described the second message;
The second sending module is used for after receiving described the second message, described the second message being sent to a described AP; Described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to described the 2nd AP.
Described determination module, concrete for obtaining the RSSI of described client under the RSSI under an AP and the 2nd AP, RSSI under the one AP is the mean value of the RSSI of nearest N1 the record of a described AP, and the RSSI under the 2nd AP is the mean value of the RSSI of nearest N2 the record of described the 2nd AP;
When the difference of described client RSSI under the 2nd AP at the RSSI under an AP and described client during more than or equal to default RSSI thresholding, determine that described client moves to described the 2nd AP overlay area by a described AP overlay area.
Whether described the first sending module is further used for judging data re-transmission rate between a described AP and described client more than or equal to default retransmission rate thresholding, and whether described client was not carried out AP and switched within Preset Time; If the data re-transmission rate is more than or equal to default retransmission rate thresholding, and do not carry out AP switched within Preset Time, and carried out to described the 2nd AP and send the first message.
Also comprise: maintenance module, be used for recording the following corresponding relation of described client when a described AP is initially described client service is provided: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of a described AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time;
After receiving the second message, the corresponding relation that upgrades described client is: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of described the 2nd AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time.
The embodiment of the present invention provides a kind of access point AP, be applied to comprise in the WLAN (wireless local area network) WLAN of access controller AC, an AP, described the 2nd AP and client as the 2nd AP, a described AP provides the AP of service for being initially described client, described the 2nd AP comprises:
Receiver module, be used for to receive from described AC be used for notify the 2nd AP that the first message of service is provided for client, carried described client corresponding informance in described the first message, and described client corresponding informance comprises: the medium access control MAC Address of described client, the MAC Address of a described AP, basic service set identification BSSID corresponding to described the above client of an AP; Wherein, to be described AC move to the 2nd AP overlay area in client by an AP overlay area to described the first message, and client sends when an AP roams into the 2nd AP;
Processing module is used for utilizing BSSID corresponding to described the above client of an AP to replace the BSSID of self;
Sending module is used for sending for notifying this equipment to provide the second message of service for client to described AC, carries the MAC Address of the 2nd AP, the MAC Address of described client in this second message; By described AC, described the second message is sent to a described AP; And described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to this 2nd AP; Utilize the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP.
Described processing module, utilizes the BSSID of a described AP to replace the N bar BSSID of self at concrete being used for when the N bar BSSID of the corresponding radio frequency of this equipment is not replaced by the BSSID of other AP; When the N bar BSSID of the corresponding radio frequency of this equipment is replaced by the BSSID of other AP, and the N-1 bar BSSID of the corresponding radio frequency of this equipment utilizes the N-1 bar BSSID of the BSSID replacement self of a described AP when not being replaced by the BSSID of other AP; By that analogy.
Compared with prior art, the embodiment of the present invention has the following advantages at least: in the embodiment of the present invention, when client moves to the 2nd AP overlay area by an AP overlay area, and when client does not roam into the 2nd AP, can provide service for client by the 2nd AP, thereby make client can connect all the time access signal AP preferably, improve the communication quality of client, and improve user's wireless experience.
Description of drawings
Fig. 1 and Fig. 2 are the networking schematic diagrames of AC+FIT AP in prior art;
Fig. 3 is a kind of client that the embodiment of the present invention provides data transmission method schematic flow sheet when moving between different AP;
Fig. 4 and Fig. 5 are the form schematic diagrames of the first message and the second message in the embodiment of the present invention;
Fig. 6 is the structural representation of a kind of AC of providing of the embodiment of the present invention;
Fig. 7 is the structural representation of a kind of AP of providing of the embodiment of the present invention.
Embodiment
For problems of the prior art, the data transmission method the when embodiment of the present invention provides a kind of client to move between different AP, the method can be applied to comprise in the WLAN of AC, an AP, the 2nd AP and client; Wherein, an AP provides the AP of service for being initially client, and the 2nd AP is that client moves the corresponding AP of rear region.
Application scenarios take Fig. 1 and Fig. 2 as the embodiment of the present invention, AP comprises AP A, AP B, AP C and AP D, and AP A, AP B, AP C and AP D have joined an AP GROUP(group) in, the AP in AP GROUP is in an identical network, can pass through the double layer network intercommunication each other.
Suppose in AP GROUP, be linked into during the client First Contact Connections (AP A is initially client service is provided in this AP GROUP) on AP A, client is after successful connection, during from position movement shown in Figure 1 to position shown in Figure 2, the one AP is AP A, and the 2nd AP is AP C.
In the embodiment of the present invention, be initially client at an AP when service be provided, when client is linked into an AP for the first time, need to record following information corresponding to client on AC:
APID: client initially connects the ID of AP, i.e. the ID of an AP;
BSSID: the initial BSSID(Basic Service Set Identification that connects of client, basic service set identification), namely in fact BSSID(corresponding to the above client of an AP be exactly the MAC Address of an AP);
AP0-MAC: client connects the MAC Address (Media Access Control, medium access control) of AP, and initial value is the MAC Address of the initial AP of connection, the i.e. MAC Address of an AP;
STA-MAC: the MAC Address of client;
STA-AID:AP is the AID(connection identifier that client is distributed);
S:1bit, whether expression encrypts, and 1 is yes, and 0 is no;
C:1bit, whether the expression client carried out AP within Preset Time (Time0) switches; If client was carried out AP and switched (namely carrying out the described technical operation of the embodiment of the present invention) within Time0, be set to 0; Do not switch if client is carried out AP within Time0, be set to 1; Wherein, Time0 is the time gate limit value of systemic presupposition, and effect is to prevent that client from switching repeatedly in two zones of closing on AP; Be 0 when client initially accesses, wait for that Time0 is set to 1 afterwards.
Based on above-mentioned application scenarios, as shown in Figure 3, the method comprises the following steps:
Step 301, AC utilizes the RSSI(Receive Signal Strength Indicator of client under an AP, received signal strength indicator) RSSI under the and two AP determines that client moves to the 2nd AP overlay area by an AP overlay area, as from position movement shown in Figure 1 to position shown in Figure 2.
in the embodiment of the present invention, AC determines that client is specifically comprised by the process that an AP overlay area moves to the 2nd AP overlay area: AC obtain the RSSI(of client under an AP as an AP by original LWAPP(Light Weight Access Point Protocol, Lightweight Access Point Protocol) flow process is notified to AC) and the RSSI(of client under the 2nd AP notify to AC by original LWAPP flow process as the 2nd AP), RSSI under the one AP is the mean value of RSSI of the client of nearest N1 time an of AP (as 3 times) record, RSSI under the 2nd AP is the mean value of RSSI of the client of nearest N2 time of the 2nd AP (as 3 times) record, based on the RSSI of client under the RSSI under an AP and the 2nd AP, when the difference of client RSSI under the 2nd AP at the RSSI under an AP and client during more than or equal to default RSSI thresholding (fixed value that this default RSSI thresholding is system definition), AC determines that client moves to the 2nd AP overlay area by an AP overlay area.
Step 302, be that the data of client forward by an AP when client does not roam into the 2nd AP(from an AP) time, AC sends to the 2nd AP by the first message (the first message is for notifying the 2nd AP to provide service for client) with the client corresponding informance; This client corresponding informance includes but not limited to: the MAC Address of the MAC Address of client, an AP, upper BSSID corresponding to client of an AP.
In a kind of preferred implementation of the embodiment of the present invention, when client does not roam into the 2nd AP from an AP, only has the data re-transmission rate of working as between an AP and client more than or equal to default retransmission rate thresholding (fixed value that this default retransmission rate thresholding is system definition), and when client was not carried out the AP switching within Preset Time, AC just can send to the 2nd AP with the client corresponding informance by the first message; Otherwise AC does not need by the first message, the client corresponding informance to be sent to the 2nd AP.
In the embodiment of the present invention, the BSSID that this first message is used for making the 2nd AP utilize the client corresponding informance replaces the BSSID of self, and utilizes the MAC Address of client and the MAC Address of an AP will send to from the data of client an AP.
Step 303, the 2nd AP utilizes BSSID corresponding to the upper client of an AP to replace the BSSID of self, and send the second message (the second message is used for notifying this equipment to provide service for client) to AC, carry the MAC Address of the 2nd AP, the MAC Address of client in this second message.
In the embodiment of the present invention, this second message is for making an AP utilize the MAC Address of the 2nd AP and the MAC Address of client will send to the data retransmission of client to the 2nd AP
In the preferred implementation of the embodiment of the present invention, the 2nd AP utilizes BSSID corresponding to the upper client of an AP to replace the BSSID of self, specifically comprise: when N bar (as the last item) BSSID of the corresponding radio frequency of the 2nd AP was not replaced by the BSSID of other AP, the 2nd AP utilized the BSSID of an AP to replace the N bar BSSID of self; When the N bar BSSID of the 2nd corresponding radio frequency of AP is replaced by the BSSID of other AP, and the N-1 bar BSSID of the corresponding radio frequency of the 2nd AP is not when being replaced by the BSSID of other AP, and the 2nd AP utilizes the N-1 bar BSSID of the BSSID replacement self of an AP; When the N-1 bar BSSID of the 2nd corresponding radio frequency of AP is replaced by the BSSID of other AP, and the N-2 bar BSSID of the corresponding radio frequency of the 2nd AP is not when being replaced by the BSSID of other AP, and the 2nd AP utilizes the N-2 bar BSSID of the BSSID replacement self of an AP; By that analogy, follow-uply no longer give unnecessary details.
In the embodiment of the present invention, the form of the first message (being used for notifying the 2nd AP to provide service for client) and the second message (being used for notifying this equipment to provide service for client) as shown in Figure 4 and Figure 5.
In the first message, Message Type(type of message) be the self-defined message type; (E0) carry AC in field and notified the message content to the 2nd AP (being the STA corresponding informance of AC record); The 2nd AP is after receiving the first message, need to respond this first message, and the middle Message Type of receiveing the response is the T0(failure) or the T(success), if Message Type is T0, in Msg Element, content is empty, if Message Type is T, receiveing the response is the second message.
It is that the situation of failure (be used for notify this equipment to provide service for client) comprising that the 2nd AP is receiveed the response: (1) the 2nd AP is after receiving the first message, if check that the client corresponding informance that comprises in the first message is not that the RSSI that self detected meets the client that adds condition, directly abandon this first message, and the middle Message Type of receiveing the response is failure; When (2) the 2nd AP replace the BSSID of self at the BSSID that utilizes an AP, if the N bar (the last item) of the corresponding radio frequency of the 2nd AP is all replaced by the BSSID of other AP to N-3 bar BSSID, the 2nd AP does not recycle the BSSID of the BSSID replacement self of an AP, and the middle Message Type of receiveing the response is failure.
In the second message, Message Type is the self-defined message type; (E) carry the 2nd AP in field and notified the message content to AC (i.e. the MAC Address of the MAC Address of the 2nd AP, client); AC need to respond this second message after receiving this second message, and the middle Message Type of receiveing the response is T, and in Msg Element, content is empty.
Step 304, AC sends to an AP with the second message after receiving the second message, and determines that by an AP this equipment needs to send to the data of client to send to the 2nd AP.
concrete, AC is after receiving the second message, if know that the MAC Address (as the MAC Address of the 2nd AP) of the AP that carries in the second message is not the MAC Address (as the MAC Address of an AP) of the AP of the upper record of AC, upgrading the client corresponding informance is: the ID(of an AP does not change), the BSSID(of the one AP does not change), the MAC Address of the 2nd AP (changes, use the MAC Address of the 2nd AP to replace the original value of AP0-MAC), the MAC Address of client (not changing), (switch for carrying out AP within Preset Time by this moment in the information of whether carrying out the AP switching within Preset Time for client, do not switch for carrying out AP within Preset Time after waiting for Preset Time), and the second message is sent to an AP, otherwise AC directly abandons the second message.
Based on above-mentioned processing, for the data transmission procedure of client, the method can also comprise:
Step 305, an AP sends the data to the 2nd AP after receiving the data that send to client, send the data to client by the 2nd AP; And/or the 2nd AP sends the data to an AP after the data of receiving from client, send the data to destination device by an AP.
In the embodiment of the present invention, the one AP sends the data to the 2nd AP, send the data to client by the 2nd AP, specifically comprise: an AP added the first heading before data, and the data that will carry the first heading send to the 2nd AP, remove the first heading by the 2nd AP, and amended data are sent to client; Wherein, the target MAC (Media Access Control) address of this first heading is the MAC Address of the 2nd AP, and source MAC is the MAC Address of an AP.
In the embodiment of the present invention, the 2nd AP sends the data to an AP, send the data to destination device by an AP, specifically comprise: the 2nd AP added the second heading before data, and the data that will carry the second heading send to an AP, remove the second heading by an AP, and amended data are sent to destination device; Wherein, the target MAC (Media Access Control) address of this second heading is the MAC Address of an AP, and source MAC is the MAC Address of the 2nd AP.
Under application scenarios illustrated in figures 1 and 2, when client moves to AP D overlay area by AP C overlay area, this AP D can carry out relevant treatment according to the handling process of AP C, and namely this moment, AP D was the 2nd AP, and the respective handling process no longer repeats to give unnecessary details at this.
Based on the inventive concept same with said method, a kind of access controller AC also is provided in the embodiment of the present invention, be applied to comprise in the WLAN (wireless local area network) WLAN of described AC, the first access point AP, the 2nd AP and client, a described AP provides the AP of service for being initially described client, as shown in Figure 6, described AC comprises:
Determination module 11 is used for utilizing client to determine that at the received signal strength indicator RSSI under an AP and the RSSI under the 2nd AP client moves to the 2nd AP overlay area by an AP overlay area;
The first sending module 12, be used for moving to the 2nd AP overlay area and described client when not roaming into described the 2nd AP from a described AP when definite client by an AP overlay area, by being used for notifying the 2nd AP to provide the first message of service that described client corresponding informance is sent to described the 2nd AP for client, described client corresponding informance comprises: the medium access control MAC Address of described client, the MAC Address of a described AP, basic service set identification BSSID corresponding to described the above client of an AP; The BSSID that described the first message is used for making the 2nd AP utilize described client corresponding informance replaces the BSSID of self, utilizes the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP;
The second sending module 14 is used for after receiving described the second message, the second message being sent to a described AP; Described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to described the 2nd AP.
Described determination module 11, concrete for obtaining the RSSI of described client under the RSSI under an AP and the 2nd AP, RSSI under the one AP is the mean value of the RSSI of nearest N1 the record of a described AP, and the RSSI under the 2nd AP is the mean value of the RSSI of nearest N2 the record of described the 2nd AP;
When the difference of described client RSSI under the 2nd AP at the RSSI under an AP and described client during more than or equal to default RSSI thresholding, determine that described client moves to described the 2nd AP overlay area by a described AP overlay area.
Whether described the first sending module 12 is further used for judging data re-transmission rate between a described AP and described client more than or equal to default retransmission rate thresholding, and whether described client was not carried out AP and switched within Preset Time; If the data re-transmission rate is more than or equal to default retransmission rate thresholding, and do not carry out AP switched within Preset Time, and carried out to described the 2nd AP and send the first message.
Described AC also comprises: maintenance module 15, be used for recording the following corresponding relation of described client when a described AP is initially described client service is provided: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of a described AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time;
After receiving the second message, the corresponding relation that upgrades described client is: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of described the 2nd AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
Based on the inventive concept same with said method, a kind of access point AP also is provided in the embodiment of the present invention, be applied to comprise in the WLAN (wireless local area network) WLAN of access controller AC, an AP, described the 2nd AP and client as the 2nd AP, a described AP provides the AP of service for being initially described client, as shown in Figure 7, described the 2nd AP comprises:
Sending module 23 is used for sending for notifying this equipment to provide the second message of service for client to described AC, carries the MAC Address of the 2nd AP, the MAC Address of described client in this second message; By described AC, described the second message is sent to a described AP; And described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to this 2nd AP; Utilize the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP.
Described processing module 22, utilizes the BSSID of a described AP to replace the N bar BSSID of self at concrete being used for when the N bar BSSID of the corresponding radio frequency of this equipment is not replaced by the BSSID of other AP; When the N bar BSSID of the corresponding radio frequency of this equipment is replaced by the BSSID of other AP, and the N-1 bar BSSID of the corresponding radio frequency of this equipment utilizes the N-1 bar BSSID of the BSSID replacement self of a described AP when not being replaced by the BSSID of other AP; By that analogy.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
Above disclosed be only several specific embodiment of the present invention, still, the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (12)
1. the data transmission method a when client moves between diverse access point AP, be applied to comprise in the WLAN (wireless local area network) WLAN of access controller AC, an AP, the 2nd AP and client, a described AP provides the AP of service for being initially described client, it is characterized in that, the method comprises:
Described AC utilizes described client to determine that at the received signal strength indicator RSSI under an AP and the RSSI under the 2nd AP described client moves to the 2nd AP overlay area by an AP overlay area;
When described client does not roam into described the 2nd AP from a described AP, described AC is by being used for notifying the 2nd AP to provide the first message of service that described client corresponding informance is sent to described the 2nd AP for client, and described client corresponding informance comprises: the medium access control MAC Address of described client, the MAC Address of a described AP, basic service set identification BSSID corresponding to described the above client of an AP; The BSSID that described the first message is used for making described the 2nd AP utilize described client corresponding informance replaces the BSSID of self, and utilizes the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP;
Described AC receives described the 2nd AP and notifies described the 2nd AP to provide the second message of service for described client to described AC being used for of sending, and carries the MAC Address of described the 2nd AP, the MAC Address of described client in described the second message;
Described AC sends to a described AP with described the second message after receiving described the second message; Described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to described the 2nd AP.
2. the method for claim 1, it is characterized in that, described AC utilizes described client to determine that at the received signal strength indicator RSSI under an AP and the RSSI under the 2nd AP described client moves to the 2nd AP overlay area by an AP overlay area, specifically comprises:
Described AC obtains the RSSI of described client under the RSSI under an AP and the 2nd AP, RSSI under the one AP is the mean value of the RSSI of nearest N1 the record of a described AP, and the RSSI under the 2nd AP is the mean value of the RSSI of nearest N2 the record of described the 2nd AP;
When the difference of described client RSSI under the 2nd AP at the RSSI under an AP and described client during more than or equal to default RSSI thresholding, described AC determines that described client moves to described the 2nd AP overlay area by a described AP overlay area.
3. the method for claim 1, is characterized in that, before described AC sent to described the 2nd AP by the first message with described client corresponding informance, described method further comprised:
Whether described AC judges data re-transmission rate between a described AP and described client more than or equal to default retransmission rate thresholding, and whether described client was not carried out AP and switched within Preset Time;
If the data re-transmission rate is more than or equal to default retransmission rate thresholding, and do not carry out AP switch within Preset Time, described AC carries out the step that sends the first message to described the 2nd AP.
4. the method for claim 1, is characterized in that, described the 2nd AP utilizes the BSSID in described client corresponding informance to replace the BSSID of self, specifically comprises:
When the N bar BSSID of the corresponding radio frequency of described the 2nd AP was not replaced by the BSSID of other AP, described the 2nd AP utilized the BSSID of a described AP to replace the N bar BSSID of self;
When the N bar BSSID of the corresponding radio frequency of described the 2nd AP is replaced by the BSSID of other AP, and when the N-1 bar BSSID of the corresponding radio frequency of described the 2nd AP was not replaced by the BSSID of other AP, described the 2nd AP utilized the BSSID of a described AP to replace the N-1 bar BSSID of self;
By that analogy.
5. the method for claim 1, is characterized in that,
Be initially described client at a described AP when service is provided, described AC records the following corresponding relation of described client: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of a described AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time;
Described AC is after receiving described the second message, and the corresponding relation that upgrades described client is: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of described the 2nd AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time.
6. the method for claim 1, is characterized in that,
A described AP utilizes the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to the process of described the 2nd AP, specifically comprise: a described AP added the first heading before data, and the data that will carry the first heading send to described the 2nd AP, remove described the first heading by described the 2nd AP, and amended data are sent to described client; Wherein, the target MAC (Media Access Control) address of described the first heading is the MAC Address of described the 2nd AP, and source MAC is the MAC Address of a described AP;
Described the 2nd AP utilizes the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client the process of a described AP, specifically comprise: described the 2nd AP added the second heading before data, and the data that will carry the second heading send to a described AP, remove described the second heading by a described AP, and amended data are sent to destination device; Wherein, the target MAC (Media Access Control) address of described the second heading is the MAC Address of a described AP, and source MAC is the MAC Address of described the 2nd AP.
7. an access controller AC, be applied to comprise that in the WLAN (wireless local area network) WLAN of described AC, the first access point AP, the 2nd AP and client, a described AP provides the AP of service for being initially described client, it is characterized in that, described AC comprises:
Determination module is used for utilizing client to determine that at the received signal strength indicator RSSI under an AP and the RSSI under the 2nd AP client moves to the 2nd AP overlay area by an AP overlay area;
The first sending module, be used for moving to the 2nd AP overlay area and described client when not roaming into described the 2nd AP from a described AP when definite client by an AP overlay area, by being used for notifying the 2nd AP to provide the first message of service that described client corresponding informance is sent to described the 2nd AP for client, described client corresponding informance comprises: the medium access control MAC Address of described client, the MAC Address of a described AP, basic service set identification BSSID corresponding to described the above client of an AP; The BSSID that described the first message is used for making the 2nd AP utilize described client corresponding informance replaces the BSSID of self, and utilizes the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP;
Receiver module is used for receiving described the 2nd AP and notifies described the 2nd AP to provide the second message of service for described client to this AC being used for of sending, and carries the MAC Address of described the 2nd AP, the MAC Address of described client in described the second message;
The second sending module is used for after receiving described the second message, described the second message being sent to a described AP; Described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to described the 2nd AP.
8. AC as claimed in claim 7, is characterized in that,
Described determination module, concrete for obtaining the RSSI of described client under the RSSI under an AP and the 2nd AP, RSSI under the one AP is the mean value of the RSSI of nearest N1 the record of a described AP, and the RSSI under the 2nd AP is the mean value of the RSSI of nearest N2 the record of described the 2nd AP;
When the difference of described client RSSI under the 2nd AP at the RSSI under an AP and described client during more than or equal to default RSSI thresholding, determine that described client moves to described the 2nd AP overlay area by a described AP overlay area.
9. AC as claimed in claim 7, is characterized in that,
Whether described the first sending module is further used for judging data re-transmission rate between a described AP and described client more than or equal to default retransmission rate thresholding, and whether described client was not carried out AP and switched within Preset Time; If the data re-transmission rate is more than or equal to default retransmission rate thresholding, and do not carry out AP switched within Preset Time, and carried out to described the 2nd AP and send the first message.
10. AC as claimed in claim 7, is characterized in that, also comprises:
Maintenance module, be used for recording the following corresponding relation of described client when a described AP is initially described client service is provided: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of a described AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time;
After receiving the second message, the corresponding relation that upgrades described client is: whether the BSSID that the ID of a described AP, described the above client of an AP are corresponding, the MAC Address of described the 2nd AP, the MAC Address of described client, described client carried out the information that AP switches within Preset Time.
11. access point AP, be applied to comprise in the WLAN (wireless local area network) WLAN of access controller AC, an AP, described the 2nd AP and client as the 2nd AP, a described AP provides the AP of service for being initially described client, it is characterized in that, described the 2nd AP comprises:
Receiver module, be used for to receive from described AC be used for notify the 2nd AP that the first message of service is provided for client, carried described client corresponding informance in described the first message, and described client corresponding informance comprises: the medium access control MAC Address of described client, the MAC Address of a described AP, basic service set identification BSSID corresponding to described the above client of an AP; Wherein, to be described AC move to the 2nd AP overlay area in client by an AP overlay area to described the first message, and client sends when an AP roams into the 2nd AP;
Processing module is used for utilizing BSSID corresponding to described the above client of an AP to replace the BSSID of self;
Sending module is used for sending for notifying this equipment to provide the second message of service for client to described AC, carries the MAC Address of the 2nd AP, the MAC Address of described client in this second message; By described AC, described the second message is sent to a described AP; And described the second message is for making a described AP utilize the MAC Address of described the 2nd AP and the MAC Address of described client will send to the data retransmission of described client to this 2nd AP; Utilize the MAC Address of described client and the MAC Address of a described AP will send to from the data of described client a described AP.
12. AP as claimed in claim 11 is characterized in that,
Described processing module, utilizes the BSSID of a described AP to replace the N bar BSSID of self at concrete being used for when the N bar BSSID of the corresponding radio frequency of this equipment is not replaced by the BSSID of other AP; When the N bar BSSID of the corresponding radio frequency of this equipment is replaced by the BSSID of other AP, and the N-1 bar BSSID of the corresponding radio frequency of this equipment utilizes the N-1 bar BSSID of the BSSID replacement self of a described AP when not being replaced by the BSSID of other AP; By that analogy.
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