CN103561449A - Wireless access method and wireless access point - Google Patents
Wireless access method and wireless access point Download PDFInfo
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- CN103561449A CN103561449A CN201310552241.2A CN201310552241A CN103561449A CN 103561449 A CN103561449 A CN 103561449A CN 201310552241 A CN201310552241 A CN 201310552241A CN 103561449 A CN103561449 A CN 103561449A
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Abstract
The invention provides a wireless access method and a wireless access point. The wireless access method is suitable for a wireless local area network and includes the steps that the AP receives detecting request information sent by a terminal STA, the type of the STA is determined by the AP according to frequency bands where the received detecting request information sent by the STA is located, wherein the type of the STA comprises the number of the frequency bands supported by the STA, and the AP sends detecting reply information to the STA in the corresponding frequency bands according to the type of the STA to enable the STA to have access to the wireless local area network. The wireless access method and the wireless access point are used for balancing loads in the wireless local area network.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of radio switch-in method and WAP (wireless access point).
Background technology
Institute of Electrical and Electric Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 serial protocols are for WLAN (wireless local area network) (Wireless Local Area Networks, WLAN) standard of formulating, wherein the main communications band of IEEE802.11 is divided into two sections, is respectively 2.4GHz and 5GHz.The frequency of 2.4GHz frequency range is from 2.4GHz to 2.4835GHz, and the equipment that meets 802.11b/g standard is operated in this frequency range; The frequency of 5GHz frequency range is divided into two sections, is respectively 5.15GHz to 5.35GHz and 5.725GHz to 5.825GHz, and the equipment that meets 802.11a standard is operated in this frequency range.
Development along with WLAN, the user who uses WLAN to carry out radio communication gets more and more, wherein a lot of users use the double-frequency wireless terminal (Station that can simultaneously support 2.4GHz and two frequency ranges of 5GHz, STA), WAP (wireless access point) (Access Point in while WLAN, AP) also there is dual frequency characteristics, can support the STA access of two frequency ranges simultaneously.STA can find WLAN by active or drive sweep mode, thus access WLAN, but for double frequency STA, can find the sign of two frequency ranges simultaneously, STA need to judge which frequency range of access.Usually, STA selects the larger frequency range of access signal strength signal intensity, and because the signal frequency of 5GHz frequency range is higher, decay is aloft very fast, therefore on identical position, the signal of 2.4GHz frequency range can be greater than the signal of 5GHz frequency range, so STA generally can select to access 2.4GHz frequency range.
But in fact, 5GHz frequency range has higher access capacity with respect to 2.4GHz, STA selects to access the wasting of resources that 2.4GHz frequency range can cause the congested of 2.4GHz frequency range and 5GHz frequency range.
Summary of the invention
The invention provides a kind of radio switch-in method and WAP (wireless access point), for making the load balancing of WLAN (wireless local area network).
The invention provides a kind of radio switch-in method, comprising:
The probe request message that access point AP receiving terminal STA sends;
Described AP determines the type of described STA according to the frequency range that receives described STA and send described probe request message place, the type of described STA comprises the number of frequency bands that described STA supports;
Described AP sends described detection in corresponding band to described STA according to the type of described STA and replys message, so that described STA accesses described WLAN (wireless local area network).
The present invention also provides a kind of WAP (wireless access point), comprising:
Receiver module, the probe request message sending for receiving terminal STA;
Processing module, for determine the type of described STA according to the frequency range that receives described STA and send described probe request message place, the type of described STA comprises the number of frequency bands that described STA supports;
Sending module, replys message for sending described detection in corresponding band to described STA according to the type of described STA, so that described STA accesses described WLAN (wireless local area network).
Radio switch-in method provided by the invention and WAP (wireless access point), AP judges the type of STA by receiving the frequency range of the probe request message of STA transmission, thereby in corresponding band, to STA, send to survey and reply message, make STA access WLAN, because the frequency range that STA accesses is determined by AP, therefore can make by the setting of network terminal the load balancing of each frequency range of WLAN.
Accompanying drawing explanation
Fig. 1 is the flow chart of radio switch-in method embodiment mono-provided by the invention;
Fig. 2 is the flow chart of radio switch-in method embodiment bis-provided by the invention;
Fig. 3 is the structural representation of WAP (wireless access point) embodiment mono-provided by the invention;
Fig. 4 is the structural representation of WAP (wireless access point) embodiment bis-provided by the invention;
Fig. 5 is the structural representation of WAP (wireless access point) embodiment tri-provided by the invention.
Embodiment
Radio switch-in method provided by the invention is applicable to WLAN (wireless local area network), has defined the equipment of two types in IEEE802.11 serial protocols, and a kind of is wireless terminal STA; Another kind is wireless access point AP, and the effect of wireless aps is to provide the bridge joint between wireless and cable network.
The basic comprising unit of WLAN (wireless local area network) is Basic Service Set (Basic Service Set, BSS), and a BSS provides an overlay area, makes the STA in BSS keep fully connecting, and general, a BSS is provided by an AP.The AP of double frequency provides two BSS.A BSS has a unique BSSID (Basic Service Set Identifier, BSSID), and BSSID is that all STA in same BSS share identifier at the frame head of sent message, and length is 48(MAC address).A plurality of BSS can form an extended service set (Extended Service Set, ESS), and the STA of ESS inside can communicate by letter mutually, but the communication between the STA in different B SS must be undertaken by AP.The system that connects a plurality of AP is called distributed system (Distributed System, DS).A general corresponding ESS of wlan network, an ESS has a unique service set (Service Set Identifier, SSID), and SSID can regard the name of WLAN as.That is to say in a WLAN and can comprise a plurality of BSS, SSID and BSSID are the relations of one-to-many.STA finds that the process of WLAN is exactly to find the process of SSID and BSSID corresponding relation.STA is finding can to access this WLAN after the SSID of WLAN and BSSID.
In existing radio switch-in method, before STA access WLAN, the WLAN that first need to can access at its range searching of living in, the mode of search can be passed through active scan or drive sweep.
When STA scans WLAN by drive sweep mode, STA constantly switches and monitors beacon (Beacon) frame on each channel, and can record the information from received all Beacon frames.Beacon frame adds the needed parameter of certain BSS to communicate in order to allow STA know in design exactly, wherein comprises SSID and corresponding BSSID.Each is wireless message is with BSSID, and Beacon frame is no exception.When STA receives after the Beacon frame that comprises SSID and BSSID, can know which BSS region exists, thereby can select one to access.
When STA scans WLAN by active scan mode, be divided into three kinds of situations.
The first is: broadcast probe request on the channel of STA in supported channel list (Probe Request) frame, and wherein SSID is empty; AP(in network may have a plurality of) receive after Probe Request frame, respond to survey and reply (Probe Response) frame, wherein comprise the corresponding relation of SSID and BSSID.Thereby make STA know the BSS that region exists, thereby can select one to access.This situation is applicable to STA can know whether there is spendable wireless service by active scan.
The second is: on the channel of STA in supported channel list, broadcast Probe Request frame, wherein carry the SSID of appointment; In this case, because STA carries the SSID of appointment, only provide the AP in the WLAN of this SSID service could receive, this AP receives response Probe Response frame afterwards, wherein comprises the corresponding relation of SSID and BSSID.Thereby make STA know the BSS that region exists, thereby can select one to access.This situation is applicable to STA and by active scan, finds the wireless network of appointment.
The third is: on the channel of STA in supported channel list, broadcast Probe Request frame; wherein carry SSID and the BSSID of appointment; this probe request has lost the meaning of finding WLAN; the keep-alive being generally used for after association; be that STA sends uni-cast probe request to certain BSS, determine whether this BSS also exists.This frame can not send as last STA is associated.
Through above-mentioned three kinds of situations, find after WLAN, STA forms a list by the WLAN of discovery and selects access for user, and index is exactly SSID, but a general system of the corresponding one or more BSSID(of SSID does not show BSSID to user).User selects after a SSID, and STA will select (being a generally signal strength signal intensity maximum) BSSID from corresponding BSSID list, sends authentication request, the request of networking to corresponding AP.
Current WLAN mainly provides 2.4GHz and two frequency ranges of 5GHz, and because the STA of double frequency possesses the access capability that uses two frequency ranges simultaneously, it can send probe request two frequency ranges simultaneously.Double frequency STA access network, has independence and uncertainty to the selection of AP.Generally, if double frequency AP provides service simultaneously in two frequency ranges, i.e. corresponding two BSSID of SSID, in each frequency range one; So under normal circumstances, STA selects the possibility of 2.4GHz more much bigger than selecting the possibility of 5GHz, and this is the inherent characteristic decision of two frequency ranges.Because 5GHz frequency band signals frequency is higher, with respect to the signal of 2.4GHz frequency range, aloft decay comparatively fast, and the upper limit of emission power of two frequency band signals is all identical, indoor AP is 100 milliwatts, so cause the coverage of 5GHz signal more much smaller than 2.4GHz.STA and AP distance is fixedly time, and the 5GHz signal receiving on STA, also than a little less than 2.4GHz, accesses so STA generally can select to access 2.4GHz frequency range.
In STA compact district, double frequency STA is in the face of a plurality of access points, and likely most of double frequency STA selects 2.4GHz frequency range accesses network, so just easily cause the load of 2.4GHz frequency range too large, crowded, and the load of 5GHz frequency range is too little, idle.
Fig. 1 is the flow chart of radio switch-in method embodiment mono-provided by the invention, and the present embodiment is applicable to WLAN (wireless local area network), and the executive agent of the present embodiment is the access point in WLAN (wireless local area network), and as shown in Figure 1, the method for the present embodiment comprises:
Step S101, AP receives the probe request message that STA sends.
Particularly, in the present embodiment, STA accesses WLAN by the mode of active scan, and AP can receive the Probe Request frame that STA sends.In the Probe Request frame that STA sends, can not comprise SSID, also can comprise SSID, but not comprise BSSID.Three kinds of situations while scanning WLAN according to above-mentioned STA by active scan mode are known; the situation that the Probe Request frame that STA sends comprises BSSID is only for the keep-alive after association; and the radio switch-in method that the present embodiment provides is for making STA access WLAN, so do not comprise BSSID in the Probe Request frame of STA transmission.Therefore, after AP receives the Probe Request frame of STA transmission, need to send Probe Response frame to STA and inform the corresponding BSSID of STA.AP can receive the Probe Request frame that STA sends in one or more frequency range.
Step S102, AP determines the type of STA according to the frequency range that receives the probe request message place of STA transmission, the type of STA comprises the number of frequency bands that STA supports.
Particularly, because STA may be that single-frequency STA may be also double frequency STA, and STA can send Probe Request frame in supported frequency range, so AP may receive the Probe Request frame that STA sends in one or two frequency range.AP can know according to the frequency range at the Probe Request frame place receiving the frequency range that the STA of this Probe Request frame of transmission supports.AP determines the type of STA thus, and the type of STA comprises the quantity of the frequency range that STA supports, for example STA only supports single-frequency or STA to support double frequency.
It should be noted that, although the STA in current WLAN only supports double frequency, can expect, along with the development of WLAN technology, WLAN may provide service in more frequency range, and STA also may support three frequently or more frequency range simultaneously.The radio switch-in method that the present embodiment provides can be applied to the situation that STA supports a plurality of frequency ranges equally.Therefore, in the present embodiment, AP may receive the Probe Request frame that STA sends in plural frequency range, thereby determines the type of STA.
Step S103, AP sends to survey to STA in corresponding band according to the type of STA and replys message, so that STA accessing WLAN.
Particularly, AP is according to the type of determined STA, in corresponding frequency range, to STA, send Probe Response frame, this Probe Response frame comprises the BSSID of the SSID of AP place WLAN and the BSS of the corresponding band that AP provides, so that STA is at corresponding frequency range access WLAN.In this case, which BSS STA accesses is determined according to the frequency range of AP transmission Probe Response frame, when STA is the STA of double frequency or multifrequency, AP can send Probe Response frame in the less frequency range of load to STA according to the current loading condition of each frequency range of WLAN, thereby makes the load balancing of each frequency range of WLAN.
The present embodiment, AP judges the type of STA by receiving the frequency range of the probe request message of STA transmission, thereby in corresponding band, to STA, send to survey and reply message, make STA access WLAN, because the frequency range that STA accesses is determined by AP, therefore can make by the setting of network terminal the load balancing of each frequency range of WLAN.
Further, in step S102, AP determines the type of STA according to the frequency range that receives the probe request message place of STA transmission, and the type of STA comprises the number of frequency bands that STA supports, comprise: if AP only receives a frequency range probe request message that STA sends, determine that STA is single-frequency STA; If AP receives N frequency range the probe request message that STA sends, determine that STA is N STA frequently.
Particularly, AP can determine that according to the quantity that receives the frequency range of the Probe Request frame that STA sends the type of STA, the type of STA are the quantity of the frequency range that STA supports.If for example AP only receives a frequency range Probe Request frame that STA sends, AP determines that this STA is single-frequency STA; If AP receives two frequency ranges the Probe Request frame that STA sends, AP determines that this STA is double frequency STA; The rest may be inferred, if AP receives N frequency range the ProbeRequest frame that STA sends, AP determines that this STA is N STA frequently.General, when AP receives after the Probe Request frame of STA transmission, can in the frequency range that receives Probe Request frame, to STA, send Probe Response frame immediately, and in the present invention, in order to identify the type of STA, need in AP, arrange accordingly, make AP a frequency range, receive after the Probe Request frame of STA transmission, first do not reply, but wait for default a period of time, for example 1 second or 2 seconds, at default monitoring in time, whether can receive the Probe Request frame that this STA sends in other frequency range.If AP does not receive the Probe Request frame that STA sends in other frequency range after Preset Time, AP determines that this STA is single-frequency STA; If AP has received in other frequency range the Probe Request frame that STA sends after Preset Time, AP, according to the frequency range sum that receives the Probe Request frame of STA transmission, determines the type of STA.After overtime in the default time, AP has determined the type of STA, and now AP sends Probe Response frame in corresponding frequency range to STA again.
Although AP does not first reply Probe Response frame after receiving Probe Request frame, but sending Probe Response frame to STA again, interval Preset Time can cause STA to find that the time of WLAN is elongated, but this only limits to STA while accessing WLAN for the first time, after the type of AP identification STA, with regard to the problem that can not occur again postponing.And AP can not affect user's use substantially for the detection of STA type.
Fig. 2 is the flow chart of radio switch-in method embodiment bis-provided by the invention, and the present embodiment is applicable to WLAN (wireless local area network), and the executive agent of the present embodiment is the access point in WLAN (wireless local area network), and as shown in Figure 2, the method for the present embodiment comprises:
Step S201, AP receives the probe request message that STA sends.
Particularly, this step is identical with step S102.
Step S202, if AP only receives a frequency range probe request message that STA sends, determines that STA is single-frequency STA; If AP receives N frequency range the probe request message that STA sends, determine that STA is N STA frequently, N>1.
Particularly, AP can determine that according to the quantity that receives the frequency range of the Probe Request frame that STA sends the type of STA, the type of STA are the quantity of the frequency range that STA supports.If for example AP only receives a frequency range Probe Request frame that STA sends, AP determines that this STA is single-frequency STA; If AP receives two frequency ranges the Probe Request frame that STA sends, AP determines that this STA is double frequency STA; The rest may be inferred, if AP receives N frequency range the Probe Request frame that STA sends, AP determines that this STA is N STA frequently, N>1.If it is that single-frequency STA performs step S203 that AP determines STA, if AP determines STA, be that N frequency STA performs step S204.
Step S203, is single-frequency STA if AP determines STA, and AP sends described detection in the frequency range that receives the described probe request message of STA transmission to STA and replys message, so that STA is at the frequency range accessing WLAN that sends probe request message.
Particularly, if it is single-frequency STA that AP determines STA, that is to say that STA only supports a frequency range, this STA can only access WLAN in a frequency range, therefore in the frequency range that AP only need to support at STA, to STA, send Probe Response frame, thereby STA just can obtain SSID and BSSID access WLAN in this frequency range.
Step S204, is N STA frequently if AP determines STA, and AP surveys and replys message to STA transmission according to replying tactful one or more frequency ranges in N frequency range, so that STA selects an accessing WLAN in receiving the frequency range of surveying reply message.
Particularly, if it is N STA frequently that AP determines STA, this STA can be in a plurality of frequency ranges accessing WLAN, on one or more in N frequency range now can supporting at STA according to the reply strategy in AP, to STA, send Probe Response frame, wherein in each Probe Response frame, include the SSID of WLAN and the BSSID of corresponding band.STA, after receiving this Probe Response frame, can select one in AP sends one or more frequency ranges of Probe Response frame, uses the SSID and the BSSID access WLAN that in the Probe Response frame of this frequency range, comprise.
It should be noted that, above-mentioned reply strategy can be preset in AP, can be also that AP dynamically determines according to the current load condition of its place WLAN.For example, for current WLAN, the access service of 2.4GHz and two frequency ranges of 5GHz can be provided, in network, the double frequency STA in an AP coverage can send Probe Request frame to AP in two frequency ranges, AP, after receiving two Probe Request frames, can determine that this STA is double frequency STA.If now in AP, default reply strategy is that 5GHz is preferential, AP can send Probe Response frame to STA in 5GHz frequency range, this Probe Response frame comprises the BSSID of 5GHz frequency range in the SSID of AP place WLAN and this AP, and AP does not send Probe Response frame in 2.4GHz frequency range to STA.STA, after 5GHz frequency range is received Probe Response frame, can access 5GHz frequency range.Same, if in AP default reply strategy be 2.4GHz preferentially AP only in 2.4GHz frequency range, reply Probe Response frame.In addition, in AP, can also be empty without default reply strategy or reply strategy, now AP can reply Probe Response frame to STA in two frequency ranges, by STA, independently selects the frequency range of required access, and now STA is generally the larger frequency range of selection signal strength signal intensity.
Reply strategy in AP can also be dynamically to determine according to the current load condition of WLAN, that is to say the Probe Request frame that receives STA as AP, determine that STA supports a plurality of frequency ranges, the current load condition of each frequency range that AP can support according to STA, select the lighter frequency range of load condition, only in the lighter frequency range of load, to STA, reply Probe Response frame, make the lighter frequency range of STA access load, can more reasonably utilize the Radio Resource in WLAN like this.STA judges that the method for each frequency range load condition can be used any method of the prior art, such as STA, can use the parameters such as STA quantity that accessed on data traffic on different frequency range, channel utilization on different frequency range, different frequency range to judge the load condition of each frequency range, repeat no more herein.
In addition, reply strategy in AP is not limited to STA, send Probe Response frame in a frequency range, but can in one or more frequency ranges, to STA, send Probe Response frame, if AP sends Probe Response frame to STA in more than one frequency range, again by the autonomous judgement of STA, need in which frequency range, access WLAN.Be equivalent to so first by AP, get rid of the frequency range that a part is not wished STA access, then the frequency range being accessed by the autonomous selection of STA, the access of STA is selected larger.
According to the method for the present embodiment, when AP receives after the probe request of STA transmission in a plurality of frequency ranges, according to replying strategy, in one or more frequency ranges, to STA, send to survey and reply frame, from network side restricts the frequency range of STA access, can make further the Internet resources of WLAN rationally use.
The present embodiment, AP judges the type of STA by receiving the frequency range of the probe request message of STA transmission, thereby to STA, send and survey reply message in one or more frequency range according to replying strategy, make STA access WLAN, because the frequency range that STA accesses is determined according to replying strategy by AP, therefore can make by the setting of network terminal the load balancing of each frequency range of WLAN.
Further, before above-mentioned steps S203 and step S204, also comprise default reply strategy or dynamically determine and reply strategy according to the load parameter of WLAN (wireless local area network) different frequency range, this reply strategy comprises that indicating AP to STA, to send to survey in one or more frequency ranges replys message.
Fig. 1 and embodiment illustrated in fig. 2 in, only illustrated that STA accesses the situation of WLAN by active scan mode, but STA can also access WLAN by drive sweep mode, when STA gets after SSID and BSSID by drive sweep mode, still can independently select to access WLAN and not controlled by the AP of network side.Therefore in the present invention, can also cut off STA and by drive sweep mode, access the means of WLAN, force STA to access WLAN by the mode of active scan.The method can comprise: in the Beacon frame of AP broadcast, hide SSID.
Therefore, radio switch-in method provided by the invention also comprises: AP broadcasts Beacon frame, does not comprise the SSID of AP place WLAN (wireless local area network) in this Beacon frame.
Particularly, in the Beacon frame of first broadcasting at AP, hide SSID, that is to say and make AP normal broadcast Beacon frame in network, but in Beacon frame, do not broadcast the SSID of AP place WLAN (wireless local area network).The STA that receives like this this Beacon frame can only therefrom obtain BSSID, and can not obtain SSID, and STA cannot find WLAN by the Beacon frame receiving like this, therefore cannot pass through the mode access network of drive sweep.Such Beacon frame can only be used as the keep-alive after association.That is to say, thereby cut off STA, by drive sweep mode, find the approach of SSID accessing WLAN, force STA to find SSID by the mode of active scan.STA specifically with which BSSID access WLAN need to select by AP like this, thereby can guarantee the Network Load Balance of WLAN.
With a specific embodiment, radio switch-in method provided by the invention is described below.
For example: an AP in WLAN supports double frequency, the SSID of WLAN is " wlan-navigation ", the BSSID of the 2.4GHz frequency range BSS that AP provides is " 0000.2222.2222 ", and the BSSID of the 5GHz frequency range BSS that AP provides is " 0000.5555.5555 ".
In prior art, AP can broadcast Beacon frame in network, wherein in the Beacon frame of 2.4GHz frequency range broadcast, indicate SSID " wlan-navigation " corresponding with BSSID " 0000.2222.2222 ", and it is corresponding with BSSID " 0000.5555.5555 " in the Beacon frame of 5GHz frequency range broadcast, to indicate SSID " wlan-navigation ".
For only supporting the single-frequency STA of 2.4GHz frequency range in network, it only can receive AP at the Beacon of 2.4GHz frequency range broadcast, and therefrom parse SSID " wlan-navigation " and BSSID " 0000.2222.2222 ", if user selects to access the WLAN that SSID is " wlan-navigation ", now STA can access BSSID for the frequency range of " 0000.2222.2222 ".
For only supporting the single-frequency STA of 5GHz frequency range in network, it only can receive AP at the Beacon of 5GHz frequency range broadcast, and therefrom parse SSID " wlan-navigation " and BSSID " 0000.5555.5555 ", if user selects to access the WLAN that SSID is " wlan-navigation ", now STA can access BSSID for the frequency range of " 0000.5555.5555 ".
For supporting the double frequency STA of 2.4GHz and 5GHz in network simultaneously, AP can be received at the Beacon of 2.4GHz frequency range and 5GHz broadcast simultaneously, and SSID " wlan-navigation " and BSSID " 0000.2222.2222 " and " wlan-navigation " and two kinds of corresponding relations of BSSID " 0000.5555.5555 " can be parsed.If user selects to access the WLAN that SSID is " wlan-navigation ", now STA both can access BSSID for the frequency range of " 0000.2222.2222 ", also can access BSSID for the frequency range of " 0000.5555.5555 ".Usually, STA tends to select the access of the good frequency range of signal strength signal intensity, and generally in the signal strength signal intensity of identical place 2.4GHz frequency range, is greater than 5GHz, so STA generally can select to access the frequency range that BSSID is " 0000.2222.2222 ".
According to the method for prior art, when STA is double frequency, generally all can accesses the frequency range of 2.4GHz, thereby easily cause the crowded of 2.4GHz frequency range.
When adopting radio switch-in method provided by the invention, first AP hides SSID in the Beacon frame of broadcast, that is to say that AP only comprises BSSID " 0000.2222.2222 " in the Beacon frame of 2.4GHz frequency range broadcast, and only comprise BSSID " 0000.5555.5555 " in the Beacon frame of 5GHz frequency range broadcast.
For only supporting the single-frequency STA of 2.4GHz frequency range in network, it only can receive AP at the Beacon of 2.4GHz frequency range broadcast, and therefrom parses BSSID " 0000.2222.2222 ", and because STA does not obtain SSID, so STA also cannot access WLAN.Now STA can only find WLAN by the mode of active probe, so STA sends Probe Request frame in 2.4GHz frequency range, and because STA is not also known SSID, so in Probe Request frame, SSID be sky.AP receives after Probe Request frame in 2.4GHz frequency range, because also the type of STA is not identified, therefore first it is not replied, but the default time of interval, for example 1 second, now AP does not receive in 5GHz frequency range the Probe Request frame that STA sends, so AP determines that STA is the single-frequency STA of 2.4GHz.Because STA does not receive the Probe Request frame that AP sends, therefore STA can resend Probe Request frame in 2.4GHz frequency range, now AP can reply Probe Response frame in 2.4GHz frequency range, wherein indicates SSID " wlan-navigation " corresponding with BSSID " 0000.2222.2222 ".STA receives after Probe Request frame, therefrom parse SSID " wlan-navigation " and BSSID " 0000.2222.2222 ", if user selects to access the WLAN that SSID is " wlan-navigation ", now STA can access BSSID for the frequency range of " 0000.2222.2222 ".
For only supporting the single-frequency STA of 5GHz frequency range in network, it only can receive AP at the Beacon of 5GHz frequency range broadcast, and therefrom parses BSSID " 0000.5555.5555 ", and because STA does not obtain SSID, so STA also cannot access WLAN.Now STA can only find WLAN by the mode of active probe, so STA sends Probe Request frame in 5GHz frequency range, and because STA is not also known SSID, so in Probe Request frame, SSID be sky.AP receives after Probe Request frame in 5GHz frequency range, because also the type of STA is not identified, therefore first it is not replied, but the default time of interval, for example 1 second, now AP does not receive in 2.4GHz frequency range the Probe Request frame that STA sends, so AP determines that STA is the single-frequency STA of 5GHz.Because STA does not receive the Probe Request frame that AP sends, therefore STA can resend Probe Request frame in 5GHz frequency range, now AP can reply Probe Response frame in 5GHz frequency range, wherein indicates SSID " wlan-navigation " corresponding with BSSID " 0000.5555.5555 ".STA receives after Probe Request frame, therefrom parse SSID " wlan-navigation " and BSSID " 0000.5555.5555 ", if user selects to access the WLAN that SSID is " wlan-navigation ", now STA can access BSSID for the frequency range of " 0000.5555.5555 ".
For supporting the double frequency STA of 2.4GHz and 5GHz in network simultaneously, can receive AP at the Beacon of 2.4GHz frequency range and 5GHz broadcast simultaneously, and therefrom parse BSSID " 0000.2222.2222 " and BSSID " 0000.5555.5555 ", because STA does not obtain SSID, so STA also cannot access WLAN.Now STA can only find WLAN by the mode of active probe, so STA sends Probe Request frame in 2.4GHz frequency range, and because STA is not also known SSID, so in Probe Request frame, SSID be sky; STA sends ProbeRequest frame in 5GHz frequency range simultaneously, and because STA is not also known SSID, so in Probe Request frame, SSID is empty.AP receives after Probe Request frame in 2.4GHz frequency range or 5GHz frequency range, because also the type of STA is not identified, therefore first it is not replied, but the default time of interval, for example 1 second, now AP can receive in 2.4GHz frequency range and 5GHz frequency range the Probe Request frame that STA sends simultaneously, so AP determines that STA is the double frequency STA that simultaneously supports 2.4GHz and 5GHz.AP need to send Probe Response frame to STA according to replying strategy, replys strategy and is divided into three kinds of situations here.
First: replying strategy is that 5GHz is preferential, AP sends ProbeResponse frame in 5GHz frequency range to STA, wherein indicates SSID " wlan-navigation " corresponding with BSSID " 0000.5555.5555 ".And AP does not send Probe Response frame in 2.4GHz frequency range to STA, AP receives STA again when the Probe Request frame of 2.4GHz transmission, also it is not replied.If user selects to access the WLAN that SSID is " wlan-navigation ",, now STA only can access BSSID for the frequency range of " 0000.5555.5555 ".
Second: replying strategy is that 2.4GHz is preferential, AP sends ProbeResponse frame in 2.4GHz frequency range to STA, wherein indicates SSID " wlan-navigation " corresponding with BSSID " 0000.2222.2222 ".And AP does not send Probe Response frame in 5GHz frequency range to STA, AP receives STA again when the Probe Request frame of 5GHz transmission, also it is not replied.If user selects to access the WLAN that SSID is " wlan-navigation ", now STA only can access BSSID for the frequency range of " 0000.2222.2222 ".
Second: replying strategy is empty (not replying strategy), AP all sends Probe Response frame to STA in 2.4GHz frequency range and 5GHz frequency range, wherein in 2.4GHz frequency range, indicate SSID " wlan-navigation " corresponding with BSSID " 0000.2222.2222 ", in 5GHz frequency range, indicate SSID " wlan-navigation " corresponding with BSSID " 0000.5555.5555 ".If user selects to access the WLAN that SSID is " wlan-navigation ", now STA both can access the frequency range that BSSID is " 0000.2222.2222 " and also can access BSSID for the frequency range of " 0000.5555.5555 ".Which frequency range access WLAN STA specifically selects, and depends on STA driving itself, and generally, STA tends to select the good frequency range of signal strength signal intensity, and BSSID is " 0000.2222.2222 " access.
It should be noted that, the reply strategy in AP can set in advance in AP, can be also to be determined in real time according to the current load condition of each frequency range of WLAN by AP.
From above-mentioned specific embodiment, can find out, in the radio switch-in method of prior art, when double frequency STA need to access WLAN, can only be selected by STA itself frequency range of access, and after the radio switch-in method provided by the invention adopting, be according to the frequency range of the reply policy selection STA access in AP, the device A P by network side controls the access frequency range of STA, can realize the reasonable utilization of WLAN frequency resource, realize the load balancing of each frequency range.
It should be noted that, in the various embodiments described above, the structure of the Probe Response frame that the Probe Request frame that STA sends to AP and AP send to STA is same as the prior art with the information wherein comprising.
Fig. 3 is the structural representation of WAP (wireless access point) embodiment mono-provided by the invention, and as shown in Figure 3, the WAP (wireless access point) of the present embodiment comprises:
Receiver module 31, the probe request message sending for receiving terminal STA;
Processing module 32, for determine the type of described STA according to the frequency range that receives described STA and send described probe request message place, the type of described STA comprises the number of frequency bands that described STA supports.
Sending module 33, replys message for sending described detection in corresponding band to described STA according to the type of described STA, so that described STA accesses described WLAN (wireless local area network).
The wireless access of the present embodiment is for realizing the technical scheme of embodiment of the method shown in Fig. 1, and it realizes principle and technique effect is similar, repeats no more herein.
Further, embodiment illustrated in fig. 3 in, processing module 32, if only receive a frequency range the described probe request message that described STA sends specifically for described AP, determines that described STA is single-frequency STA; If described AP receives N frequency range the described probe request message that described STA sends, determine that described STA is N STA frequently, N>1.
Further, in embodiment illustrated in fig. 3, sending module 33, if determine that specifically for described AP described STA is single-frequency STA, described AP sends described detection in the frequency range that receives the described probe request message of described STA transmission to described STA and replys message, so that described STA accesses described WLAN (wireless local area network) in the frequency range that sends described probe request message; If it is N STA frequently that described AP determines described STA, described AP sends described detection to described STA and replys message according to replying one or more frequency ranges of strategy in a described N frequency range, so that described STA receives described detection and selects one to access described WLAN (wireless local area network) in replying the frequency range of message described.
Fig. 4 is the structural representation of WAP (wireless access point) embodiment bis-provided by the invention, as shown in Figure 4, the WAP (wireless access point) of the present embodiment is on the basis of Fig. 3, also comprise: reply policy module 34, for default described reply strategy or according to the load parameter of described WLAN (wireless local area network) different frequency range, dynamically determine described reply strategy, described reply strategy comprises that the described AP of indication sends described detection to described STA and replys message in one or more frequency ranges.
Fig. 5 is the structural representation of WAP (wireless access point) embodiment tri-provided by the invention, as shown in Figure 5, the WAP (wireless access point) of the present embodiment is on the basis of Fig. 4, also comprise: broadcast module 35, for broadcast beacon Beacon frame, in described Beacon frame, do not comprise the service set SSID of described AP place WLAN (wireless local area network).
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a radio switch-in method, is characterized in that, comprising:
The probe request message that access point AP receiving terminal STA sends;
Described AP determines the type of described STA according to the frequency range that receives described STA and send described probe request message place, the type of described STA comprises the number of frequency bands that described STA supports;
Described AP sends described detection in corresponding band to described STA according to the type of described STA and replys message, so that described STA accesses described WLAN (wireless local area network).
2. method according to claim 1, is characterized in that, described AP determines the type of described STA according to the frequency range that receives the described probe request message place of described STA transmission, and the type of described STA comprises the number of frequency bands that described STA supports, comprising:
If described AP only receives a frequency range the described probe request message that described STA sends, determine that described STA is single-frequency STA;
If described AP receives N frequency range the described probe request message that described STA sends, determine that described STA is N STA frequently, N>1.
3. method according to claim 1, is characterized in that, described AP sends described detection in corresponding band to described STA according to the type of described STA and replys message, so that described STA accesses described WLAN (wireless local area network), comprising:
If it is single-frequency STA that described AP determines described STA, described AP sends described detection in the frequency range that receives the described probe request message of described STA transmission to described STA and replys message, so that described STA accesses described WLAN (wireless local area network) in the frequency range that sends described probe request message;
If it is N STA frequently that described AP determines described STA, described AP sends described detection to described STA and replys message according to replying one or more frequency ranges of strategy in a described N frequency range, so that described STA receives described detection and selects one to access described WLAN (wireless local area network) in replying the frequency range of message described.
4. method according to claim 3, it is characterized in that, if it is N STA frequently that described AP determines described STA, described AP sends described detection reply message according to replying one or more frequency ranges of strategy in a described N frequency range to described STA, so that described STA receives before described detection selects a described WLAN (wireless local area network) of access in replying the frequency range of message described, also comprise:
Default described reply strategy or tactful according to the dynamic definite described reply of the load parameter of described WLAN (wireless local area network) different frequency range in described AP, described reply strategy comprises that the described AP of indication sends described detection to described STA and replys message in one or more frequency ranges.
5. according to the method described in claim 1～4 any one, it is characterized in that, described AP also comprises before receiving the probe request message of STA transmission:
Described AP broadcast beacon Beacon frame, does not comprise the service set SSID of described AP place WLAN (wireless local area network) in described Beacon frame.
6. a WAP (wireless access point), is characterized in that, comprising:
Receiver module, the probe request message sending for receiving terminal STA;
Processing module, for determine the type of described STA according to the frequency range that receives described STA and send described probe request message place, the type of described STA comprises the number of frequency bands that described STA supports;
Sending module, replys message for sending described detection in corresponding band to described STA according to the type of described STA, so that described STA accesses described WLAN (wireless local area network).
7. WAP (wireless access point) according to claim 6, is characterized in that, described processing module, if only receive a frequency range the described probe request message that described STA sends specifically for described AP, determines that described STA is single-frequency STA; If described AP receives N frequency range the described probe request message that described STA sends, determine that described STA is N STA frequently, N>1.
8. WAP (wireless access point) according to claim 6, it is characterized in that, described sending module, if determine that specifically for described AP described STA is single-frequency STA, described AP sends described detection in the frequency range that receives the described probe request message of described STA transmission to described STA and replys message, so that described STA accesses described WLAN (wireless local area network) in the frequency range that sends described probe request message; If it is N STA frequently that described AP determines described STA, described AP sends described detection to described STA and replys message according to replying one or more frequency ranges of strategy in a described N frequency range, so that described STA receives described detection and selects one to access described WLAN (wireless local area network) in replying the frequency range of message described.
9. WAP (wireless access point) according to claim 8, it is characterized in that, also comprise: reply policy module, for default described reply strategy or according to the load parameter of described WLAN (wireless local area network) different frequency range, dynamically determine described reply strategy, described reply strategy comprises that the described AP of indication sends described detection to described STA and replys message in one or more frequency ranges.
10. according to the WAP (wireless access point) described in claim 6～9 any one, it is characterized in that, also comprise: broadcast module, for broadcast beacon Beacon frame, does not comprise the service set SSID of described AP place WLAN (wireless local area network) in described Beacon frame.
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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: Fujian Xingwangruijie Network Co., Ltd. |