CN102833824A - Access method and device for wireless local area network and network equipment - Google Patents
Access method and device for wireless local area network and network equipment Download PDFInfo
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- CN102833824A CN102833824A CN2012103173003A CN201210317300A CN102833824A CN 102833824 A CN102833824 A CN 102833824A CN 2012103173003 A CN2012103173003 A CN 2012103173003A CN 201210317300 A CN201210317300 A CN 201210317300A CN 102833824 A CN102833824 A CN 102833824A
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Abstract
The invention discloses an access method and device for a wireless local area network and network equipment. The method comprises the following steps of performing analysis judgment for accessing parameters of the same STA (station) submitted by at least two APs (access point) through an AC (access control), when no associated identity of AP and STA is included in the accessing parameters, determining the associated AP of the STA according to the AP receiving signal strength value in each accessing parameter, and indicating the associated AP to send probe response to the STA; and when the associated identity of AP and STA is included in the accessing parameters, determining a roaming AP of the STA according to the AP receiving signal strength value in each accessing parameter, in such a way, the AC can effectively and reliably determine the associated AP or roaming AP for the STA, and the associated AP or roaming AP is not required to be determined by the STA, therefore, in the WLAN (wireless local area network) of the existing thin AP model, as the STA performs access decision and roaming decision, the problems that the STA accessing efficiency and roaming efficiency are low can be solved.
Description
Technical field
The present invention relates to wireless communication system, particularly, relate to a kind of cut-in method and device, network equipment of WLAN.
Background technology
At WLAN (WLAN; Wireless Local Area Network) in; Portable work station (or being called website) (STA; Station) utilize probe request (Probe Request) to scan which 802.11 network is arranged in the region at present; If the AP among this WLAN receives this probe request, and AP and STA whether consult relevant network parameter compatible, if compatibility then AP feedback probe response (probe response) frame are to STA; Probing response frame has comprised all parameter informations of wireless beacon frame (beacon), and portable work station can be adjusted according to the parameter information in the probing response frame that receives and add the network desired parameters.
At present, among the WLAN of thin AP model (being the AC+AP model), user cut-in managing method comprises that STA inserts equally loaded management and STA roaming management.
Insert in the load-balancing method at STA; Through wireless integrated manipulator (AC; Access Control) number of users of each AP is monitored; When the AP number of users that connects under the AC did not reach the upper limit that this AP disposes, STA can carry out association (be STA pass through this AP insert WLAN) to this AP; If the associated user number of the AP of current association has reached the upper limit of configuration; The then related failure of STA; STA will select the best AP of current demand signal to carry out association in this case; And STA selects other AP to carry out association with after the number of times of the related failure of the best AP of this signal reaches threshold value once more.
Particularly, Fig. 1 shows the schematic network structure of the WLAN of existing thin AP model, and is as shown in Figure 1; AC is through four AP of switch (Switch) second line of a couplet, i.e. Fit AP-A, Fit AP-B, Fit AP-C and Fit AP-D, and AP-A has inserted 7 STA; AP-B has inserted 8 STA, has inserted 2 STA under the AP-C, has inserted 2 users under the AP-D; STA 1 is to be accessed in WLAN, and the signal strength signal intensity (A-ARR) that AP-A receives STA 1 is-40dBm that the signal strength signal intensity (B-ARR) that AP-B receives STA 1 is-45dBm; The signal strength signal intensity (C-ARR) that AP-C receives STA 1 is-40dBm; The signal strength signal intensity (D-ARR) that AP-D receives STA 1 is-35dBm that the signal strength signal intensity (A-SRR) that STA 1 receives AP-A is-55dBm that the signal strength signal intensity (B-SRR) that STA 1 receives AP-B is-50dBm; The signal strength signal intensity (C-SRR) that STA 1 receives AP-C is-60dBm that the signal strength signal intensity (D-SRR) that STA 1 receives AP-D is-60dBm.Fig. 2 shows the process chart that existing STA inserts network as shown in Figure 1, and this processing procedure comprises the steps:
Step 201, when STA 1 carries out network selecting related the time, can at first send the probe request (prob request) of broadcasting;
Step 202, (when for example AP-A ~ AP-D) receives the probe requests thereby that STA sends, all can reply the probe response (prob response) of clean culture, and carry some parameter informations of self network as the AP near the wireless network the STA 1; When STA 1 received the probe response that AP-A ~ AP-D replys, at this time STA can be according to receiving that the signal magnitude of this probe response preferentially selects signal to carry out association preferably, and for example, STA 1 has selected AP-B (B-SRR:-50);
Step 203, STA 1 send a message identifying (Auth Request) and give AP-B;
Step 204, AP-B reply authentication response (Auth Response) to STA 1;
After step 205, authentication were passed through, STA 1 sent association request (Assoc Request) to AP-B;
Step 206, AP-B send to AC with association request (Assoc Request), and AC carries out related legitimacy verification;
Step 207, AC identify this STA and want the number of users on the related AP-B to reach the upper limit, then reply the associated response message of related failure;
Step 208, AP-B send to STA 1 clean culture and do not allow related message;
Step 209, STA 1 related failure because this network is the preferred network in the STA buffer memory, so STA is related in association failure meeting continuation attempted authentication, promptly repeats above-mentioned steps 205 to 208 and reach predetermined times;
Step 210, STA 1 broadcast once more and send probe request (prob request);
Step 211, AP-A ~ AP-D respond the probe requests thereby of STA1 respectively, and probe response (prob response) is replied in clean culture;
After step 212, STA 1 discharges AP-B, select the best AP of signal to carry out association, AP-A for example, STA 1 sends association request (Assoc Request) to AP-A;
Step 213, AP-A send to AC with association request;
Step 214, AC carry out related legitimacy verification, and AC judges that the number of users on the AP-A does not reach the upper limit, replys related successful response message to AP-A;
Step 215, AP-A send related successful associated response message to STA 1, allow STA 1 to insert, STA 1 related success.
It is thus clear that; Existing user management load-balancing method can cause following at least two problems: first; STA can carry out the repeatedly related of repetition under the situation of association failure; And importantly the association failure stage of STA is the phase III that is in agreement association process regulation, and this has just greatly wasted bandwidth and access efficiency is low; The second, STA is under identical locus and the metastable situation of WLAN environment relatively stablely, the decision process that the each association of STA all will be carried out repetition, and this causes, and STA inserts slowly, access efficiency is low.
On the other hand, in the STA roaming management, the roaming of STA is through after receiving beancon or receiving probing response frame, identifies interior network signal of a period of time and speed variation has taken place, and just roams decision-making.But; According to the agreement regulation, beancon is a broadcasting packet, and its transmission is fixed at interval; And after the STA transmission probe requests thereby; AP only can return a probe response, as STA from some network mobile to the another one network time, can cause STA can not receive beancon message or detection response message in time so; Thereby make the STA network information that can not upgrade in time trigger roaming decision-making, the lower problem of roaming efficient, the STA long period is in the situation that will go offline under the more weak environment of signal like this.
Thus it is clear that, in the WLAN of present thin AP model, exist by STA and insert decision-making and roaming decision-making and the STA access efficiency that causes is low and roam inefficient problem.
Summary of the invention
In view of this; The embodiment of the invention provides a kind of cut-in method and device, network equipment of WLAN; In the WLAN that solves existing thin AP model, insert decision-making and roaming decision-making and the STA access efficiency that causes is low and roam inefficient problem by STA.
Embodiment of the invention technical scheme is following:
A kind of cut-in method of WLAN; Comprise: wireless integrated manipulator AC receives the access parameter to same site STA from least two access point AP respectively in the section at the fixed time; Each said access parameter be each said AP according to from the same probe requests thereby of said STA and definite, said access parameter comprises: the sign whether the reception signal strength values when said AP receives said probe requests thereby and said AP and said STA related; Said AC does not all comprise under the situation of the sign that AP is associated with said STA in judging each access parameter; Receive signal strength values according to the AP in each access parameter and confirm the associated AP of said STA, and indicate determined associated AP to send probe response to said STA; Said AC goes out under the situation of the sign that comprises in the said access parameter that AP is associated with said STA in interpretation; Receive signal strength values according to the AP in each access parameter and confirm the roaming AP of said STA, and indicate determined roaming AP to send probe response to said STA.
A kind of access device of WLAN; Comprise: receiver module; Receive access parameter respectively in the section at the fixed time to same site STA from least two access point AP; Each said access parameter be each said AP according to from the same probe requests thereby of said STA and definite, said access parameter comprises: the sign whether the reception signal strength values when said AP receives said probe requests thereby and said AP and said STA related; Judge module is judged the sign that whether comprises in each access parameter that AP is associated with said STA; AM access module; Be used for judging under the situation that each access parameter all do not comprise the sign that AP is associated with said STA at said judge module; Receive signal strength values according to the AP in each access parameter and confirm the associated AP of said STA, and indicate determined associated AP to send probe response to said STA; Roam module; Be used for judging at access parameter and comprise under the situation of the sign that AP is associated with said STA at said judge module; Receive signal strength values according to the AP in each access parameter and confirm the roaming AP of said STA, and indicate determined roaming AP to send probe response to said STA.
A kind of network equipment comprises the access device of aforesaid WLAN.
The embodiment of the invention is carried out analysis and judgement through AC according to the access parameter to same STA that reports from least two AP; When not comprising in the access parameter under the situation of the sign that AP is associated with STA; Receive the associated AP that signal strength values is confirmed STA according to the AP in each access parameter; And indicate associated AP to send probe response to STA, under the situation that comprises the sign that AP is associated with STA in the access parameter, receive the roaming AP that signal strength values is confirmed STA according to the AP in each access parameter; Then AC can be efficiently, confirm associated AP or roaming AP for STA reliably; And need not to confirm to avoid associated AP or roaming AP among the WLAN of existing thin AP model by STA, insert decision-making and roaming decision-making and the STA access efficiency that causes is low and roam inefficient problem by STA.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become apparent, perhaps understand by embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Fig. 1 is the schematic network structure of the WLAN of existing thin AP model;
Fig. 2 inserts the process chart of network as shown in Figure 1 for existing STA;
The workflow diagram of the cut-in method of the WLAN that Fig. 3 provides for the embodiment of the invention;
The structured flowchart of the access device of the WLAN that Fig. 4 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described, should be appreciated that embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Among the WLAN to existing thin AP model; Insert decision-making and roaming decision-making and the STA access efficiency that causes is low and roam inefficient problem by STA; The embodiment of the invention has proposed a kind of cut-in method and device of WLAN; In the method, come to come for STA confirms associated AP or roaming AP, comprise in the access parameter that whether related AP receive reception signal strength values that the probe requests thereby from STA is and AP and STA sign according to the access parameter that at least two AP report for same STA by AC; Can determine associated AP or the roaming AP of STA efficiently, reliably, thereby can solve the aforementioned problems in the prior.
Be described in detail in the face of the embodiment of the invention down.
Fig. 3 shows the workflow diagram of the cut-in method of the WLAN that the embodiment of the invention provides, and as shown in Figure 3, this method comprises:
Step 302, AC all do not comprise under the situation of the sign that AP is associated with STA in judging each access parameter; Receive signal strength values based on the AP in each access parameter and confirm the associated AP of STA, and indicate determined associated AP to send probe response to STA;
Through above-mentioned processing procedure; AC carries out analysis and judgement according to the access parameter to same STA that reports from least two AP; When not comprising in the access parameter under the situation of the sign that AP is associated with STA; Receive the associated AP that signal strength values is confirmed STA according to the AP in each access parameter, under the situation that comprises the sign that AP is associated with STA in the access parameter, receive the roaming AP that signal strength values is confirmed STA according to the AP in each access parameter; Then AC can be efficiently, confirm associated AP or roaming AP for STA reliably; Confirm to avoid associated AP or roaming AP among the WLAN of existing thin AP model and need not STA, insert decision-making and roaming decision-making and the STA access efficiency that causes is low and roam inefficient problem by STA.
Below respectively to confirming that associated AP and the processing procedure of roaming AP are elaborated.
(1), confirms associated AP
Step 2, receive signal strength values, confirm the associated AP of STA according to the AP in associated record and each access parameter;
Particularly; In contingency table, include under the situation of associated record of at least one STA; The difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of this STA respectively and each access parameter; Exist the corresponding difference of associated record to be under the situation within the predetermined error range, the associated AP that writes down in this associated record is confirmed as the associated AP of STA, handle proceeding to step 5;
The difference corresponding at each bar associated record all is not under the situation within the predetermined error range, receives signal strength values based on predetermined access strategy and the AP in each access parameter, confirms the associated AP of STA, promptly handles proceeding to step 3;
Step 3, AC receive signal strength values according to predetermined access strategy and the AP in each access parameter, confirm the associated AP of STA;
Particularly; Access strategy comprises: with the AP in each access parameter receive signal strength values more than or equal to the AP of predetermined minimum signal strength threshold value as optional AP (, showing a little less than the signal strength signal intensity of STA to being not enough to communicate) if the AP in each access parameter receives signal strength values less than predetermined minimum signal strength threshold value; In the access parameter of each optional AP; Determine the maximum AP of numerical value and receive signal strength values; With receiving AP in the access parameter of other AP the AP of signal strength values and receive signal strength values and this maximum AP and receive AP that signal strength values differs the AP that is scheduled to signal threshold value to be selected (for example 5dBm) and have this maximum AP reception signal strength values except that having this maximum AP among the optional AP jointly as AP to be selected; According to each AP of record in advance the number of related STA, in AP to be selected with AP the AP of related STA minimum number confirm as the associated AP of STA; Further, in AP to be selected, exist at least two AP related STA number equate and minimum situation under, in these at least two AP, AP in the access parameter is received the associated AP that the maximum AP of signal strength values confirms as STA; Then,
AC is brought into the reception of the AP in each access parameter signal strength values and carries out analysis and judgement in the access strategy, for STA confirms associated AP;
Step 4, AC be the newly-increased current associated record of STA in contingency table, the sign of reception signal strength values when promptly AC write down AP reception probe requests thereby in the sign, each access parameter of STA in contingency table and the associated AP of determined STA; The associated record that STA is current, can be STA follow-up insert among this WLAN once more or in this WLAN roaming the time confirm that associated AP or roaming AP provide reference;
Step 5, AC indicate determined associated AP to send probe response to STA.
In above-mentioned processing procedure; AC receives at least two access parameters to same STA that AP reports; In access parameter, all do not comprise under the situation of the sign that AP is associated with STA; Showing that this STA is current is not linked among the WLAN as yet; This moment, AC at first searched in advance the associated record whether STA is arranged in the contingency table of setting up according to the sign of STA, if exist the associated record of STA to show that then this STA once was linked among this WLAN, and the difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of this STA this moment respectively and each access parameter; Exist the corresponding difference of an associated record to be under the situation within the predetermined error range; Explain that STA is once to be linked into (for example, STA is in the fixing scene for a long time, all is linked in the same associated AP) among the WLAN at every turn in the identical or similar scene; This moment, AC need not to STA confirms associated AP again, and the associated AP that the associated AP of the STA that is write down in this associated record is confirmed as among the current WLAN of being linked into of STA gets final product; If the difference that each bar associated record is corresponding all is not within the predetermined error range; Showing then that STA is current (for example is linked among the WLAN with difference access scene in the past; STA has left long-term residing fixed scene; And currently neither insert WLAN with the scene that once inserted or the scene of roaming once), perhaps do not exist the associated record of STA to show that then STA be not linked among this WLAN in the contingency table, this moment, AC was that STA confirms associated AP according to predetermined access strategy.
Thus it is clear that,, can improve STA and be linked into the access efficiency among the WLAN according to above-mentioned processing procedure.At first; AC can through inquiry contingency table and simple numerical value transport operation identify STA current whether with identical or similar scene access WLAN once; If there is identical or similar scene; Then the associated AP in the identical or similar scene that is write down is confirmed as the associated AP of the current access of STA WLAN; Can be efficiently, reliably for STA confirms associated AP, even avoid STA in the prior art to be in the fixing scene the low problem of access efficiency that when each WLAN of access, still need insert decision-making and cause.And AC sets up associated record after the associated AP of at every turn having confirmed STA, can reference be provided for follow-up access decision-making.In addition; The access strategy that the embodiment of the invention provides; At first in optional AP, confirm signal preferably several AP be AP to be selected; The reception signal strength values of AP to be selected in predetermined scope, also be the signal of each AP to be selected than the signal effect of non-AP to be selected good and for STA reception similar, and in AP to be selected, select the AP of load minimum (also being the minimum number of the STA of AP association); Can reach the best and effect of load balance of signal; Preferably distributing radio resource, realize the load balancing of AP, can avoid that STA at first selects the good AP of signal to cause related failure easily in the prior art, and carry out repeatedly related after the failure and too much occupied bandwidth resource, problem that access efficiency is low.
(2) confirm roaming AP
Step 2, receive signal strength values, confirm the roaming AP of STA according to the AP in associated record and each access parameter;
Particularly, AC confirms the current associated AP of STA according to the sign of STA in contingency table; In the concrete process that realizes; Can in contingency table, embody the temporal information that generates each bar associated record; For example, through the time of record generation associated record in associated record, perhaps embody the time of producing each bar associated record through method according to time-sequencing; Confirm that according to temporal information which bar associated record is the current associated record of STA, and the current associated AP of definite STA; Also can show the associated AP that STA is current through other method;
AC includes in contingency table under the situation of associated record of two STA at least; The difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of STA respectively and each access parameter; Exist the corresponding difference of associated record to be within the predetermined error range and the associated AP in this associated record is not under the situation of the current associated AP of STA; The associated AP that writes down in this associated record is confirmed as the roaming AP of STA; Processing proceeds to step 5; If exist the corresponding difference of associated record to be within the predetermined error range and the associated AP in this associated record is under the situation of the current associated AP of STA, handle and return step 301;
The difference corresponding at each bar associated record all is not under the situation within the predetermined error range, confirms promptly to handle the roaming AP of STA and proceed to step 3 according to predetermined roaming strategy and the AP received signal intensity level in each access parameter;
Step 3, receive signal strength values, confirm the roaming AP of STA based on predetermined roaming strategy and the AP in each access parameter;
Particularly; The roaming strategy comprises: AC confirms that respectively the AP in the access parameter of the AP except that the current associated AP of STA receives the difference of the AP reception signal strength values in the access parameter of the current associated AP of signal strength values and STA; In the corresponding AP of difference of AP, AP in the access parameter is received the roaming AP that the maximum AP of signal strength values confirms as STA more than or equal to predetermined roaming signal strength threshold; AP reception signal strength values equates and is maximum in the access parameter of at least two AP, and then these at least two AP are roaming AP;
Then; AC is brought into the AP received signal intensity level in each access parameter in the roaming strategy; AP received signal intensity level in each access parameter meets under the situation of roaming strategy, according to the roaming AP of the definite STA of roaming strategy, handles proceeding to step 4; Under the situation that does not meet the roaming strategy, handle and return step 1;
Step 4, AC write down the sign of the roaming AP of reception signal strength values and determined STA when AP receives probe requests thereby in the sign, each access parameter of STA in contingency table;
Step 5, the determined roaming AP of AC indication send probe response to STA;
Particularly; AC indication roaming AP improves the power and the frequency of replying probe response; And the current associated AP of indication STA reduces the frequency of replying probe response; Also be that AC indicates determined roaming AP in the answer cycle of a probe response, send at least two probe responses with predetermined transmitted power to STA, predetermined transmitted power is greater than the signal transmitting power of the current associated AP of STA; Further, the AP of the current association of AC indication STA sends a probe response to STA in the answer cycle of at least two probe responses;
STA confirms to receive the maximum AP of signal strength values the roaming AP that be reality according to the reception signal strength signal intensity of probe response from roaming AP that receives, and STA is treated to prior art.
In above-mentioned processing procedure; The access parameter that AC reports based at least two AP to same STA; In access parameter, comprise under the situation of the sign that AP is associated with STA; Showing that this STA is current has been linked among the WLAN; This moment, AC judged based on the reception of the AP in each access parameter signal strength values whether STA is in roaming state; At first AC searches the associated record that whether has STA in the contingency table based on the sign of STA, under the situation that has two associated records (wherein the record that associated record is the current association of STA records the current associated AP of STA in this record), shows that this STA once was linked among this WLAN at least perhaps once roaming among the WLAN; The reception signal strength values of confirming each AP in every associated record of STA respectively and the AP of corresponding AP in access parameter receive the difference of signal strength values; If exist the corresponding difference of associated record to be within the predetermined error range and the associated AP in this associated record is not under the situation of the current associated AP of STA, show that STA roams, do not start the roaming decision-making; If exist the corresponding difference of associated record to be within the predetermined error range and the associated AP in this associated record is not under the situation of the current associated AP of STA; Show this STA once with similar or identical scene relating to other AP; At this moment, AC confirms as the associated AP that writes down in this associated record the roaming AP of STA; If the difference that each bar associated record is corresponding all is not within the predetermined error range, show that then the current roaming scence of STA does not match with once related scene, should roam AP this moment based on the roaming strategy for STA is definite.And; In contingency table, only have under the situation of associated record of a STA; Show that this associated record is the record of the current association of STA; Also be STA not with other the scene relating except that current scene in WLAN, at this moment, should receive signal strength values according to the AP in each access parameter and confirm to roam AP for STA with the roaming strategy.In the roaming strategy, be that STA confirms roaming AP according to the best principle of signal.And the determined roaming of AC indication AP improves the transmitted power and the frequency of replying probe response, and the current associated AP of indication STA reduces the frequency of replying probe response.
Thus it is clear that,, can improve the roaming efficient of STA according to above-mentioned processing procedure.At first; AC can through inquiry contingency table and simple numerical value transport scene that operation identifies the STA current roaming whether with once related scene identical or similar (being the associated record of at least two STA of existence in the contingency table); If there is identical or similar situation; Then the associated AP in the identical or similar scene that is write down is confirmed as the current roaming AP of STA, can be the definite roaming of STA AP efficiently, reliably, and; The determined roaming of AC indication AP improves the transmitted power and the frequency of replying probe response; The current associated AP of indication STA reduces the frequency of replying probe response, can make STA perceive roaming AP more significantly, thereby guiding STA is associated with on the roaming AP; Thereby can avoid STA in the prior art to trigger the inefficient problem of roaming that the roaming decision-making causes, can reduce the problem that goes offline in the STA roam procedure significantly through receiving beancon message or detection response message.If not existing with the identical or similar scene of the scene of STA current roaming in the associated record of STA (is the associated record that only has a STA in the contingency table; Also promptly this associated record is the current associated record of STA); Be that STA confirms roaming AP then, can avoid the problem that STA goes offline easily in the prior art in roam procedure according to the best principle of signal.
Based on identical inventive concept; The embodiment of the invention also provides a kind of access device of WLAN; Fig. 4 shows the structured flowchart of the access device of the WLAN that the embodiment of the invention provides; As shown in Figure 4, this device comprises: receiver module 41, judge module 42, AM access module 43 and roam module 44.
Particularly, AM access module 43 is searched the associated record that whether has STA based on the sign of STA in the contingency table of setting up in advance; Under the situation of the associated record that has STA; Receive signal strength values based on the AP in associated record and each access parameter, confirm the associated AP of STA, under the situation of the associated record that does not have STA; Receive signal strength values based on predetermined access strategy and the AP in each access parameter, confirm the associated AP of STA;
Wherein, AM access module 43 receives signal strength values according to the AP in associated record and each access parameter; Confirm the associated AP of STA; Specifically comprise: in contingency table, include under the situation of associated record of at least one STA; Corresponding AP receives the difference of signal strength values in the reception signal strength values of confirming each AP in every associated record of STA respectively and each access parameter, exists the difference of an associated record correspondence to be under the situation within the predetermined error range, the associated AP that writes down in this associated record is confirmed as the associated AP of STA; The difference corresponding at each bar associated record all is not under the situation within the predetermined error range, confirms the associated AP of STA according to predetermined access strategy and the AP reception signal strength values in each access parameter.
The sign of the associated AP of reception signal strength values and the determined STA of AM access module 43 when also AP receives the same probe requests thereby of said STA in the sign, each access parameter of record STA in contingency table.
Roam module 44; Be connected to judge module 42; Be used for comprising under the situation of the sign that AP is associated with STA at access parameter in judge module 42 judgements; Receive signal strength values according to the AP in each access parameter and confirm the roaming AP of STA, and indicate determined roaming AP to send probe response to STA.
Particularly, roam module 44 is searched the associated record that whether has STA according to the sign of STA in the contingency table of setting up in advance; Under the situation of the associated record that has at least two STA; Receive signal strength values according to the AP in associated record and each access parameter, confirm the roaming AP of STA, under the situation of the associated record that only has a STA; Receive signal strength values according to predetermined roaming strategy and the AP in each access parameter, confirm the roaming AP of STA;
Wherein, roam module 44 receives signal strength values according to the AP in associated record and each access parameter, confirms the roaming AP of STA, specifically comprises: according to the sign of STA, in contingency table, confirm the current associated AP of STA; In contingency table, include under the situation of associated record of at least two STA; The difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of STA respectively and each access parameter; Exist the corresponding difference of associated record to be within the predetermined error range and the associated AP in this associated record is not under the situation of the current associated AP of STA; The associated AP that writes down in this associated record is confirmed as the roaming AP of STA; The difference corresponding at each bar associated record all is not under the situation within the predetermined error range, confirms the roaming AP of STA according to predetermined roaming strategy and the AP reception signal strength values in each access parameter;
Roam module 44 receives signal strength values according to predetermined roaming strategy and the AP in each access parameter; Confirm the roaming AP of STA; Specifically comprise: confirm that respectively AP in the access parameter of the AP except that the current associated AP of STA receives the difference of the AP reception signal strength values in the access parameter of the current associated AP of signal strength values and STA; In the corresponding AP of difference of AP, AP in the access parameter is received the roaming AP that the maximum AP of signal strength values confirms as STA more than or equal to predetermined roaming signal strength threshold.
The sign of reception signal strength values when roam module 44 also is used in the sign of contingency table record STA, each access parameter AP and receives the same probe requests thereby of STA and the roaming AP of determined STA.
Roam module 44 also is used to indicate determined roaming AP in the answer cycle of a probe response, sends at least two probe responses with predetermined transmitted power to STA, and predetermined transmitted power is greater than the signal transmitting power of the current associated AP of STA; Indicate the current associated AP of STA in the answer cycle of at least two probe responses, send a probe response to STA.
According to device as shown in Figure 4; Also can be efficiently, confirm associated AP or roaming AP for STA reliably; Can avoid among the WLAN of existing thin AP model, insert decision-making and roaming decision-making and the STA access efficiency that causes is low and roam inefficient problem by STA.
The embodiment of the invention also provides a kind of network equipment, and this network equipment comprises the access device of WLAN as shown in Figure 4, and preferably, this network equipment is AC.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (25)
1. the cut-in method of a WLAN WLAN is characterized in that, comprising:
Wireless integrated manipulator AC receives the access parameter to same site STA from least two access point AP respectively in the section at the fixed time; Each said access parameter be each said AP based on from the same probe requests thereby of said STA and definite, said access parameter comprises: the sign whether the reception signal strength values when said AP receives said probe requests thereby and said AP and said STA related;
Said AC does not all comprise under the situation of the sign that AP is associated with said STA in judging each access parameter; Receive signal strength values based on the AP in each access parameter and confirm the associated AP of said STA, and indicate determined associated AP to send probe response to said STA;
Said AC goes out under the situation of the sign that comprises in the said access parameter that AP is associated with said STA in interpretation; Receive signal strength values according to the AP in each access parameter and confirm the roaming AP of said STA, and indicate determined roaming AP to send probe response to said STA.
2. method according to claim 1 is characterized in that, also comprises the sign of said STA in the said access parameter;
Receive the associated AP that signal strength values is confirmed said STA according to the AP in each access parameter; Specifically comprise: said AC is according to the sign of said STA; In the contingency table of setting up in advance, search the associated record that whether has said STA, under the situation of the associated record that has said STA, receive signal strength values according to the AP in said associated record and each access parameter; Confirm the associated AP of said STA; Under the situation of the associated record that does not have said STA, receive signal strength values according to predetermined access strategy and the AP in each access parameter, confirm the associated AP of said STA;
Wherein, Record the associated record of each STA that inserts WLAN in the said contingency table, the sign of reception signal strength values when sign, each AP that comprises a STA in said associated record receives the same probe requests thereby of this STA broadcasting and the associated AP of this STA.
3. method according to claim 2 is characterized in that, receives signal strength values according to the AP in said associated record and each access parameter, confirms the associated AP of said STA, specifically comprises:
In said contingency table, include under the situation of associated record of at least one said STA; The difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of said STA respectively and each access parameter; Exist the corresponding difference of an associated record to be under the situation within the predetermined error range; The associated AP that writes down in this associated record is confirmed as the associated AP of said STA; All be not under the situation within the said predetermined error range in the corresponding difference of each bar associated record, receive the associated AP that signal strength values is confirmed said STA with AP in each access parameter according to predetermined access strategy.
4. according to claim 2 or 3 described methods, it is characterized in that said predetermined access strategy specifically comprises:
With the AP in each access parameter receive signal strength values more than or equal to the AP of predetermined minimum signal strength threshold value as optional AP; In the access parameter of each optional AP; Determine the maximum AP of numerical value and receive signal strength values; With receiving AP in the access parameter of the AP the AP of signal strength values and receive signal strength values and this maximum AP and receive AP that signal strength values differs the AP that is scheduled to signal threshold value to be selected and have this maximum AP reception signal strength values except that having this maximum AP among the optional AP jointly as AP to be selected; According to each AP of record in advance the number of related STA, in said AP to be selected with AP the AP of related STA minimum number confirm as the associated AP of said STA.
5. method according to claim 4 is characterized in that, predetermined access strategy also comprises:
In said AP to be selected, exist at least two AP related STA number equate and minimum situation under, in these at least two AP, AP in the access parameter is received the associated AP that the maximum AP of signal strength values confirms as said STA.
6. method according to claim 5 is characterized in that, said method also comprises:
The sign of reception signal strength values when AP receives the same probe requests thereby of said STA in the sign, each access parameter of the said STA of record in said contingency table and the associated AP of determined said STA.
7. method according to claim 1 is characterized in that, also comprises the sign of said STA in the said access parameter;
Receive the roaming AP that signal strength values is confirmed said STA based on the AP in each access parameter; Specifically comprise: said AC is based on the sign of said STA; In the contingency table of setting up in advance, search the associated record that whether has said STA, under the situation of the associated record that has at least two said STA, receive signal strength values based on the AP in said associated record and each access parameter; Confirm the roaming AP of said STA; Under the situation of the associated record that only has a said STA, receive signal strength values based on predetermined roaming strategy and the AP in each access parameter, confirm the roaming AP of said STA;
Wherein, Record the associated record of each STA that inserts WLAN in the said contingency table, the sign of reception signal strength values when sign, each AP that comprises a STA in said associated record receives the same probe requests thereby of this STA broadcasting and the associated AP of this STA.
8. method according to claim 7 is characterized in that, according to the reception signal strength values of the AP in said associated record and each access parameter, confirms the roaming AP of said STA, specifically comprises:
Said AC confirms the current associated AP of said STA according to the sign of said STA in said contingency table;
In said contingency table, include under the situation of associated record of at least two said STA; The difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of said STA respectively and each access parameter; Exist the corresponding difference of associated record to be within the predetermined error range and the associated AP in this associated record is not under the situation of the current associated AP of said STA; The associated AP that writes down in this associated record is confirmed as the roaming AP of said STA; The difference corresponding at each bar associated record all is not under the situation within the predetermined error range, confirms the roaming AP of said STA according to predetermined roaming strategy and the AP reception signal strength values in each access parameter.
9. method according to claim 8 is characterized in that, said predetermined roaming strategy specifically comprises:
Said AC confirms that respectively the AP in the access parameter of the AP except that the current associated AP of said STA receives the difference of the AP reception signal strength values in the access parameter of the current associated AP of signal strength values and said STA; In the corresponding AP of difference of AP, AP in the access parameter is received the roaming AP that the maximum AP of signal strength values confirms as said STA more than or equal to predetermined roaming signal strength threshold.
10. method according to claim 9 is characterized in that, said method also comprises:
The sign of reception signal strength values when AP receives the same probe requests thereby of said STA in the sign, each access parameter of the said STA of record in said contingency table and the roaming AP of determined said STA.
11. method according to claim 9 is characterized in that, indicates determined roaming AP to send probe response to said STA, specifically comprises:
Determined roaming AP is in the answer cycle of a probe response in said AC indication, and at least two probe responses of said STA transmission, said predetermined transmitted power is greater than the signal transmitting power of the current associated AP of said STA with predetermined transmitted power.
12. method according to claim 11 is characterized in that, said method also comprises:
Said AC indicates the current associated AP of said STA in the answer cycle of at least two probe responses, sends a probe response to said STA.
13. the access device of a WLAN WLAN is characterized in that, comprising:
Receiver module; Receive access parameter respectively in the section at the fixed time to same site STA from least two access point AP; Each said access parameter be each said AP according to from the same probe requests thereby of said STA and definite, said access parameter comprises: the sign whether the reception signal strength values when said AP receives said probe requests thereby and said AP and said STA related;
Judge module is judged the sign that whether comprises in each access parameter that AP is associated with said STA;
AM access module; Be used for judging under the situation that each access parameter all do not comprise the sign that AP is associated with said STA at said judge module; Receive signal strength values according to the AP in each access parameter and confirm the associated AP of said STA, and indicate determined associated AP to send probe response to said STA;
Roam module; Be used for judging at access parameter and comprise under the situation of the sign that AP is associated with said STA at said judge module; Receive signal strength values according to the AP in each access parameter and confirm the roaming AP of said STA, and indicate determined roaming AP to send probe response to said STA.
14. device according to claim 13 is characterized in that, also comprises the sign of said STA in the said access parameter; Then,
Said AM access module; Specifically be used for: according to the sign of said STA; In the contingency table of setting up in advance, search the associated record that whether has said STA, under the situation of the associated record that has said STA, receive signal strength values according to the AP in said associated record and each access parameter; Confirm the associated AP of said STA; Under the situation of the associated record that does not have said STA, receive signal strength values according to predetermined access strategy and the AP in each access parameter, confirm the associated AP of said STA;
Wherein, Record the associated record of each STA that inserts WLAN in the said contingency table, the sign of reception signal strength values when sign, each AP that comprises a STA in said associated record receives the same probe requests thereby of this STA broadcasting and the associated AP of this STA.
15. device according to claim 14 is characterized in that, said AM access module specifically is used for:
In said contingency table, include under the situation of associated record of at least one said STA; The difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of said STA respectively and each access parameter; Exist the corresponding difference of an associated record to be under the situation within the predetermined error range; The associated AP that writes down in this associated record is confirmed as the associated AP of said STA; All be not under the situation within the said predetermined error range in the corresponding difference of each bar associated record, receive the associated AP that signal strength values is confirmed said STA with AP in each access parameter according to predetermined access strategy.
16., it is characterized in that said AM access module specifically is used for according to claim 14 or 15 described devices:
With the AP in each access parameter receive signal strength values more than or equal to the AP of predetermined minimum signal strength threshold value as optional AP; In the access parameter of each optional AP; Determine the maximum AP of numerical value and receive signal strength values; With receiving AP in the access parameter of the AP the AP of signal strength values and receive signal strength values and this maximum AP and receive AP that signal strength values differs the AP that is scheduled to signal threshold value to be selected and have this maximum AP reception signal strength values except that having this maximum AP among the optional AP jointly as AP to be selected; According to each AP of record in advance the number of related STA, in said AP to be selected with AP the AP of related STA minimum number confirm as the associated AP of said STA.
17. device according to claim 16 is characterized in that, said AM access module also is used for:
In said AP to be selected, exist at least two AP related STA number equate and minimum situation under, in these at least two AP, AP in the access parameter is received the associated AP that the maximum AP of signal strength values confirms as said STA.
18. device according to claim 17 is characterized in that, said AM access module also is used for:
The sign of reception signal strength values when AP receives the same probe requests thereby of said STA in the sign, each access parameter of the said STA of record in said contingency table and the associated AP of determined said STA.
19. device according to claim 13 is characterized in that, also comprises the sign of said STA in the said access parameter; Then,
Said roam module; Specifically be used for: according to the sign of said STA; In the contingency table of setting up in advance, search the associated record that whether has said STA, under the situation of the associated record that has at least two days said STA, receive signal strength values according to the AP in said associated record and each access parameter; Confirm the roaming AP of said STA; Under the situation of the associated record that only has a said STA, receive signal strength values according to predetermined roaming strategy and the AP in each access parameter, confirm the roaming AP of said STA;
Wherein, Record the associated record of each STA that inserts WLAN in the said contingency table, the sign of reception signal strength values when sign, each AP that comprises a STA in said associated record receives the same probe requests thereby of this STA broadcasting and the associated AP of this STA.
20. device according to claim 19 is characterized in that, said roam module specifically is used for:
According to the sign of said STA, in said contingency table, confirm the current associated AP of said STA;
In said contingency table, include under the situation of associated record of at least two said STA; The difference of corresponding AP reception signal strength values in the reception signal strength values of confirming each AP in every associated record of said STA respectively and each access parameter; Exist the corresponding difference of associated record to be within the predetermined error range and the associated AP in this associated record is not under the situation of the current associated AP of said STA; The associated AP that writes down in this associated record is confirmed as the roaming AP of said STA; The difference corresponding at each bar associated record all is not under the situation within the predetermined error range, confirms the roaming AP of said STA according to predetermined roaming strategy and the AP reception signal strength values in each access parameter.
21. device according to claim 20 is characterized in that, said roam module specifically is used for:
Confirm that respectively AP in the access parameter of the AP except that the current associated AP of said STA receives the difference of the AP reception signal strength values in the access parameter of the current associated AP of signal strength values and said STA; In the corresponding AP of difference of AP, AP in the access parameter is received the roaming AP that the maximum AP of signal strength values confirms as said STA more than or equal to predetermined roaming signal strength threshold.
22. device according to claim 21 is characterized in that, said roam module also is used for:
The sign of reception signal strength values when AP receives the same probe requests thereby of said STA in the sign, each access parameter of the said STA of record in said contingency table and the roaming AP of determined said STA.
23. device according to claim 21 is characterized in that, said roam module specifically is used for:
Indicate determined roaming AP in the answer cycle of a probe response, send at least two probe responses with predetermined transmitted power to said STA, said predetermined transmitted power is greater than the signal transmitting power of the current associated AP of said STA.
24. device according to claim 23 is characterized in that, said roam module also is used for:
Indicate the current associated AP of said STA in the answer cycle of at least two probe responses, send a probe response to said STA.
25. a network equipment is characterized in that, comprises the access device like each described WLAN in the claim 13 to 24.
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Address after: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 Garden State Industrial Park 19 floor Patentee after: RUIJIE NETWORKS Co.,Ltd. Address before: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 Garden State Industrial Park 19 floor Patentee before: Beijing Star-Net Ruijie Networks Co.,Ltd. |