CN104703234A - Method and device for access switching in wireless local area network - Google Patents
Method and device for access switching in wireless local area network Download PDFInfo
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- CN104703234A CN104703234A CN201310646299.3A CN201310646299A CN104703234A CN 104703234 A CN104703234 A CN 104703234A CN 201310646299 A CN201310646299 A CN 201310646299A CN 104703234 A CN104703234 A CN 104703234A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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Abstract
The invention relates to the technical field of communication, and especially relates to a method and a device for access switching in a wireless local area network in order to solve the problem that the load between APs may be not balanced and even switching failure is caused because the load of a target AP is not taken into consideration during access switching of an STA in the prior art. The method for access switching according to the embodiment of the invention comprises the following steps: an AC receives a switching measurement report of an STA forwarded by a source AP to which the STA is accessed; the AC determines a destination AP of the STA after access switching according to the switching measurement report and access information of at least one determined neighborhood AP, wherein the access information includes load information; and the AC sends switching indication information including the destination AP to the source AP to enable the source AP to forward the switching indication information to the STA.
Description
Technical field
The present invention relates to communication technical field, particularly relate to the access switching method in a kind of WLAN (wireless local area network) and device.
Background technology
Along with developing rapidly of WLAN (wireless local area network) (Wireless Local Area Networks, WLAN), WLAN obtains large-scale deployment and application in numerous place such as building, enterprise.
In the network architecture of WLAN, mainly comprise access controller (Access Controller, AC), access point (Access Point, AP) and user terminal (Station, STA), wherein, AP is communicated with STA by wireless link, and AP up direction is connected by wire link with AC; AC is responsible for managing concentratedly AP and STA, issues configuration information, the behavior of control AP and STA to AP, and AP is responsible for finishing the work flow process according to the configuration information of AC; When using the real time business such as the networking telephone (Voice over InternetProtocol, VoIP) as STA, in moving process, good business continuance how is kept to become extremely important.
In order to keep good business continuance in moving process, when STA finds that current access AP signal quality is deteriorated, can select to be switched to new AP; Between AP in a wlan in handover scheme, handoff procedure mainly comprises scanning, certification and re-association three processes, to be specially: STA scans ambient signals intensity, and according to the signal strength signal intensity of each AP scanned, to select the AP of signal quality the best as the target AP after switching; STA sends authentication request message to current access AP, the AC managing this AP by this authentication request message repeating to target AP, afterwards, complete the process of exchange correlation security parameter through authentication request, authentication response, authentication request, these four steps of confirmation certification, and complete resource reservation in target AP; STA initiates reassociation requests to target AP, and the reassociation requests of target AP response STA, completes handoff procedure.
In such scheme, STA, according to the signal strength signal intensity select target AP of each AP scanned, owing to not considering the loading condition of target AP, is easy to the load imbalance caused between AP, even causes handoff failure.
Summary of the invention
The embodiment of the present invention provides access switching method in a kind of WLAN (wireless local area network) and device, the loading condition of target AP is not considered when carrying out access and switching in order to solve STA in prior art, be easy to the load imbalance caused between AP, even cause the problem of handoff failure.
Access switching method in the WLAN (wireless local area network) that the embodiment of the present invention provides, comprising:
The handover measurement report of the described STA that the source access point AP that access controller AC receives user terminal STA access forwards; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of described source AP;
Described AC, according to the access information of the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching; Wherein, described access information comprises load information;
The indication message comprising described target AP is sent to described source AP by described AC, to make described source AP, described indication message is transmitted to described STA.
Alternatively, described AC also comprises before receiving the handover measurement report of the described STA that described source AP forwards:
Described AC determines the identification information of at least one neighborhood AP of described source AP;
The identification information of at least one neighborhood AP described in determining is sent to described source AP by described AC, to make described STA after the identification information receiving at least one neighborhood AP described in described source AP forwarding, according to the identification information of described at least one neighborhood AP, initiate to measure to described at least one neighborhood AP.
Access switching method in a kind of WLAN (wireless local area network) that the embodiment of the present invention provides, comprising:
User terminal STA determines that handover measurement is reported; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of the source access point AP of the current access of described STA,
User terminal STA sends handover measurement report to described source AP, to make the access controller AC of management described source AP according to the report of described handover measurement and the access information of at least one neighborhood AP of described source AP determined, determine the target AP after described STA switching, and send the indication message comprising described target AP to described source AP; Described access information comprises: load information;
The indication message comprising target AP that described STA forwards according to described source AP, is switched to described target AP.
Alternatively, described STA determines that handover measurement is reported, comprising:
Described STA receives the identification information of at least one neighborhood AP that described source AP sends;
Described STA, according to the identification information of described at least one neighborhood AP, by initiating to measure to described at least one neighborhood AP, determines that handover measurement is reported.
A kind of access controller AC that the embodiment of the present invention provides, C comprises:
Receiver module, the handover measurement report of the described STA that the source access point AP accessed for receiving user terminal STA forwards; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of described source AP;
Determination module, for the access information according to the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching; Wherein, described access information comprises load information;
Sending module, for the indication message comprising described target AP is sent to described source AP, is transmitted to described STA to make described source AP by described indication message.
A kind of user terminal STA that the embodiment of the present invention provides, comprising:
Determination module, for determining that handover measurement is reported; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of the source access point AP of the current access of described STA,
Sending module, for sending handover measurement report to described source AP, to make the access controller AC of management described source AP according to the report of described handover measurement and the access information of at least one neighborhood AP of described source AP determined, determine the target AP after described STA switching, and send the indication message comprising described target AP to described source AP; Described access information comprises: load information;
Handover module, for the indication message comprising target AP forwarded according to described source AP, is switched to described target AP.
In the embodiment of the present invention, handover measurement report reporting is given the source AP of access by STA, after source AP is transmitted to AC, and the access information of the neighborhood AP of this source AP reported according to this handover measurement by AC and determine, determine that STA carries out accessing the target AP after switching, and this target AP is indicated to STA; The embodiment of the present invention gives AC owing to the control of switching being delivered from STA, the access informations such as the load information of the neighborhood AP that AC can report in conjunction with the handover measurement of STA and self determine to select the target AP after switching for STA, thus the loading condition of neighborhood AP can be taken into full account, for STA selects suitable target AP to access.The employing embodiment of the present invention can balance the load between AP, improves handover success rate, and then can save switching flow, reduces offered load.
Accompanying drawing explanation
Access switching method flow chart in the WLAN (wireless local area network) that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 is the extended message form schematic diagram of the probe response Probe Response frame of embodiment of the present invention definition;
Fig. 3 is the message format schematic diagram of the handover measurement report of embodiment of the present invention definition;
Fig. 4 is the message format schematic diagram of the indication message of embodiment of the present invention definition;
Fig. 5 is the message format schematic diagram of the load information inquiry request of embodiment of the present invention definition;
Fig. 6 is the message format schematic diagram of the load requests response message of embodiment of the present invention definition;
Fig. 7 is the switching flow schematic diagram in the embodiment of the present invention;
Access switching method flow chart in the WLAN (wireless local area network) that Fig. 8 provides for the embodiment of the present invention two;
Fig. 9 is the access switching flow schematic diagram in the embodiment of the present invention three;
Shown in Figure 10, it is the AC structural representation that the embodiment of the present invention provides;
Shown in Figure 11, it is the STA structural representation that the embodiment of the present invention provides.
Embodiment
The basic thought of the embodiment of the present invention is that the switching controls of access power is handed to AC from STA, the access informations such as the load information of neighborhood AP reported in conjunction with the handover measurement of STA by AC and determine come for this STA select access to switch after target AP, thus the loading condition of neighborhood AP can be taken into full account, for STA selects suitable target AP, load between balance AP, improves handover success rate.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As shown in Figure 1, be the access switching method flow chart in the WLAN (wireless local area network) that the embodiment of the present invention one provides, comprise the following steps:
The handover measurement report of the described STA that S101: the access controller AC source access point AP receiving user terminal STA access forwards; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of described source AP;
S102: described AC, according to the access information of the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching; Wherein, described access information comprises: load information;
The indication message comprising described target AP is sent to described source AP by S103: described AC, to make described source AP, described indication message is transmitted to described STA.
In specific implementation process, STA can periodic scan current access AP link-quality, and the link-quality of neighborhood AP, can when the link-quality of current access AP be lower than setting threshold value, and/or when packet loss is lower than setting threshold value, source AP to access sends handover measurement report, or periodically can send handover measurement report to source AP, source AP is after receiving the report of this handover measurement, the report of the handover measurement of reception is transmitted to AC, AC determines the access informations such as the load information of the neighborhood AP related in the report of this handover measurement, determine that AP carries out accessing the target AP after switching according to the link quality information of the neighborhood AP in the access information of the neighborhood AP determined and measurement report.
In traditional scheme, owing to not considering the loading condition of target AP, when target AP number of users transships, be easy to cause handoff failure, meanwhile, because handoff failure causes STA to need again again to initiate new switching flow, thus add the load of network side, and the embodiment of the present invention according to the loading condition select target AP of neighborhood AP, thus can improve handover success rate, reduce offered load simultaneously; Moreover, in traditional scheme, owing to not considering the loading condition of target AP, when the access bandwidth of target AP is inadequate, cannot ensure the access rate of new access user, the access rate of other users can be reduced again simultaneously, and the embodiment of the present invention can select neighborhood internal burden is relatively light, access rate is secure AP as target AP, thus the load that can balance between AP, improve the cut-in quality of user.
Alternatively, described AC also comprises before receiving the handover measurement report of the described STA that described source AP forwards:
Described AC determines the identification information of at least one neighborhood AP of described source AP;
The identification information of at least one neighborhood AP described in determining is sent to described source AP by described AC, to make described STA after the identification information receiving at least one neighborhood AP described in described source AP forwarding, according to the identification information of described at least one neighborhood AP, initiate to measure to described at least one neighborhood AP.
In specific implementation process, if AC does not indicate neighborhood AP to STA, STA just needs each signal scanned in all channels, sweep time is longer, efficiency is lower, the efficiency that handover measurement is reported is determined in order to improve STA, shorten the time span that STA carries out switched scan, reduce the power consumption of STA, AC can the neighborhood AP list of pre-configured this source AP in inside, this list is sent to source AP by webmaster or internal configurations interface, access in the process of WLAN at STA, source AP by the extension field of probe response Probe Response frame by this neighborhood AP list notification to STA, thus the neighborhood AP that STA can be made only need to scan through ProbeResponse frame get, improve scan efficiency, moreover, in the neighborhood AP information that the pre-configured network design of AC and construction period are planned, effective guarantee can also be provided to the continuous covering of signal.
As shown in Figure 2, for the extended message form schematic diagram of the probe response Probe Response frame of embodiment of the present invention definition, comprise frame head (MAC Header), service set (SSID), switchable AP list (HO APList), the source identity (Element ID) of switchable AP list, the length (Length) of switchable AP list, frame entity (Body), frame entity comprises: the source identity (Element ID) of frame entity, the length (Length) of frame entity, channel number (Channel x), basic service set identification (BSSID m ... BSSID n), wherein, the unit that one or more is relevant can be comprised in Body, a channel comprises multiple BSSID, BSSID is as the mark of AP, there are multiple AP of same channel number in the neighborhood of i.e. source AP.
Alternatively, described handover measurement report also comprises the link quality information of described source AP; Described AC before determining the target AP after described STA switching, also comprises after receiving the handover measurement report of the described STA that described source AP forwards: described AC, according to the link quality information of described source AP, determines that described STA needs to carry out access and switches; And/or,
Described handover measurement report also comprises the type that described handover measurement is reported, the type of described handover measurement report is periodically handover measurement report, or, the timely handover measurement report that described STA reports after determining to need to carry out accessing switching; After described AC receives the handover measurement report of the described STA that described source AP forwards, before determining the target AP after described STA switching, also comprise: described AC is determining that the type that described handover measurement is reported is after timely handover measurement is reported, determines that described STA needs to carry out access and switches.
In specific implementation process, STA only can report the link quality information of neighborhood AP in handover measurement report, also the link quality information of the source AP of current access and the link quality information of neighborhood AP can be reported in handover measurement report, the type that can also the link quality information of the source AP of current access, the link quality information of neighborhood AP and handover measurement be reported to report in handover measurement report, when STA only reports the link quality information of neighborhood AP in handover measurement report, AC can when receiving the report of this handover measurement, namely determine that this STA needs to carry out access switching, and the link quality information of the neighborhood AP reported according to STA and the access information of neighborhood AP determined are this STA select target AP, when STA reports the link quality information of the link quality information of the source AP of current access and neighborhood AP in handover measurement report, the link quality information of the source AP that AC can report according to STA judges that this STA switches the need of carrying out access, determining that this STA needs to carry out after access switches, in reporting according to handover measurement, the link quality information of neighborhood AP and the access information of neighborhood AP determined are this STA select target AP, when STA reports the link quality information of the source AP of current access in handover measurement report, during the link quality information of neighborhood AP and the type three of handover measurement report time, first AC can check the type that this handover measurement is reported, when the type determining that this handover measurement is reported is the report of timely handover measurement, then determine that the report of this handover measurement is that STA is finding that the source AP link-quality of current access is deteriorated, need to carry out accessing the handover measurement report reported when switching, then determine that this STA needs to carry out access and switches, when the type determining that this handover measurement is reported is reported for periodicity handover measurement, then need the link quality information of checking source AP in the report of this handover measurement further, judge that this STA switches the need of carrying out access further according to the link quality information of this source AP.
In specific implementation process, the mode that above-mentioned periodicity can be reported and report in time combines, and like this, like this, can ensure the promptness of switching at STA and AC bilateral; In tradition handover scheme, only have and just trigger switching after beacon (Beacon) frame number lost reaches setting threshold n, and general n >5, therefore, adopting traditional approach, triggering handover delay at more than 500ms from determining that needs are switched to, and adopt the embodiment of the present invention, STA according to current ink quality, can send handover measurement report, greatly reduces handover delay immediately after determining to need switching.
As shown in Figure 3, for the message format schematic diagram of the handover measurement report of embodiment of the present invention definition, comprise: frame type (Category), subframe type (Action), measurement report content (Measurement ReportElements), the cell ID(Element ID of measurement report content), the length (Length) of measurement report content, the type (Type) of handover measurement report, frame entity (Body), frame entity comprises: basic service set identification (BSSID), channel number (Channel Id), the signal strength signal intensity (RSSI) of field AP, the signal to noise ratio (snr) of neighborhood AP, field AP makes an uproar (SNF) at the end of this channel, wherein, Category can be set to 0, represent the Action frame of spectrum management class, Action can be set to 40, also can be set to the unduplicated type of arbitrary and existing Action message, representative belongs to handover measurement report (Handover Measurement Report) frame type of new definition, Type 0 or 1 be can be set to, periodically handover measurement report and the report of timely handover measurement are expressed as, the unit that one or more is relevant can be comprised, the link quality information of neighborhood AP corresponding different respectively in Body.
In specific implementation process, when AC reports according to the handover measurement of STA, after determining that this STA needs to carry out access switching, can be this STA select target AP according to the link quality information of neighborhood AP in handover measurement report and the access information of neighborhood AP determined, and the mark of this target AP is placed in indication message sends to STA; As shown in Figure 4, for the message format schematic diagram of the indication message of embodiment of the present invention definition, comprise: frame type (Category), subframe type (Action), switching instruction (Flag), frame entity (Body), frame entity comprises: the source identity (Element ID) of frame entity, the length (Length) of frame entity, the basic service set identification (BSSID) of target AP, the channel number (Channel Id) of target AP, wherein, Category can be set to 0, represent the Action frame of spectrum management class; Action can be set to 40, also can be set to the unduplicated type of arbitrary and existing Action message, representative belongs to switching instruction (Handover Indication) frame type of new definition; Can arrange Flag value is 0 or 1, represents respectively to need to perform to switch and do not need to perform switching.
Alternatively, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
In specific implementation process, according to any one link quality information above-mentioned, AC or STA can judge that this STA switches the need of carrying out access, such as, after determining that the signal strength signal intensity of source AP is lower than setting threshold, determine that this STA needs to carry out access and switches, also target AP can be determined according to any one link quality information above-mentioned, AC also can consider above-mentioned multiple link quality information, in a word, more weak in the signal strength signal intensity of a certain AP, signal to noise ratio is lower, the end is when making an uproar higher, determines that the link-quality of this AP is poor.
Alternatively, described AC determines the access information of any one neighborhood AP of described source AP according to following steps:
Described AC after determining the AP that described any one neighborhood AP manages for described AC, the access information of described any one neighborhood AP of inquiry in the management information of described AC; Or,
Described AC, after determining the AP that described any one neighborhood AP manages for other AC, sends access information inquiry request to other AC described, and receives the access information of described any one neighborhood AP that other AC described sends.
In specific implementation process, the switching of STA can be two layers of switching, namely other AP managing with same AC belonging to the AP of this source is switched to from source AP, also can be three layers of switching, namely be switched to other AP under other AC management, if two layers of switching, the AC of managed source AP can directly at the access information of internal queries target AP, if three layers of switching, the AC of managed source AP needs to send access information inquiry request to other AC; In addition, another mode can also be adopted, that is:
The handover measurement that the AC of managed source AP sends according to STA is reported, the AC of the switchable field AP of inquiry management successively, determined whether being switched to this neighborhood AP by the AC of the changeable neighborhood AP of management, receiving after AC allows the reply switched, then selecting the neighborhood AP under this AC as the target AP after switching.
Alternatively, described load information comprises one or more in following information:
The quantity of the access STA of setting;
The quantity of actual access STA;
The STA access rate of setting;
The average access rate of actual access STA;
Central processor CPU occupancy.
In specific implementation process, the neighborhood AP of source AP may comprise above-mentioned AC manage under neighborhood AP, also the neighborhood AP under other AC management may be comprised, for one of them neighborhood AP, if the AP that this neighborhood AP manages for this AC, then this AC directly can inquire about the management information of self, determine the access information of this neighborhood AP, if the AP that this neighborhood AP manages for other AC, then this AC can send access information inquiry request to other AC, and receiving the access information that other AC returns, namely access information here comprises load information, as shown in Figure 5, for the message format schematic diagram of the load information inquiry request of embodiment of the present invention definition, comprise: the message-length (Length) of IP head (IP Header), load requests (Load Request), this load information inquiry request, frame entity (Body), frame entity comprise multiple basic service set identification (BSSID1 ... BSSID n), be also the mark of multiple field AP, as shown in Figure 6, for the message format schematic diagram of the load requests response message of embodiment of the present invention definition, comprise: IP head (IPHeader), load response (Load Response), the message-length (Length) of this load requests response message, frame entity (Body), frame entity comprises: the source identity (Element ID) of frame entity, the length (Length) of frame entity, basic service set identification (BSSID), the quantity (Set User Num) of the access STA of setting, the quantity (Fact User Num) of actual access STA, the STA access rate (Set Rate) of setting, the average access rate (Fact Rate) of actual access STA, central processor CPU occupancy (CPU Rate).
Alternatively, in step S101, described access information also comprises: access bandwidth information;
Described AC, according to the access information of the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching, comprising:
Described AC, according to the link quality information of at least one neighborhood AP of described source AP and load information, determines at least one first candidate target AP;
Described AC, according to the access bandwidth information of at least one the first candidate target AP described, from least one first candidate target AP described, determines at least one second candidate target AP;
Described AC, according to the link quality information of at least one the second candidate target AP described, from least one second candidate target AP described, determines the target AP after described STA switching.
In specific implementation process, except above-mentioned link quality information and load information, AC can also determine the target AP after STA switching in conjunction with the access bandwidth information of neighborhood AP; Particularly, as shown in Figure 7, be the switching flow schematic diagram in the embodiment of the present invention; AC can determine the target AP after described STA switching according to following steps:
S701:AC receives the handover measurement report that STA sends;
S702:AC, according to the link quality information of source AP in the report of this handover measurement, judges that this STA switches the need of carrying out access; If so, then step S703 is entered, otherwise, enter step S708;
S703:AC obtains the AP list 1(APlist1 that can supply to switch from the handover measurement report received);
S704:AC determines the load factor of each AP in APlist1, and from APlist1, obtain the AP list 2(APlist2 of present load rate lower than setting threshold); Such as, setting threshold can be set to 70%;
S705:AC, according to the link quality information of neighborhood AP in the handover measurement report received, selects link quality parameter to be greater than the AP list 3(APlist3 of setting threshold from APlist2); Here link quality parameter can be signal strength signal intensity, signal to noise ratio etc.;
S706:AC, according to the access bandwidth information of AP each in the APlist3 determined, selects the AP of access bandwidth pattern optimum from APlist3, composition APlist4;
S707:AC, according to the handover measurement report received, selects the AP of link-quality optimum to carry out accessing the target AP after switching as STA, and is indicated to STA from APlist4;
S708:AC indicates STA not need to carry out access switching.
Corresponding with the above-mentioned access switching method based on AC side, following examples of the present invention provide the access switching method based on STA side, and the principle that following examples are dealt with problems is similar to the aforementioned embodiment, repeat part and repeat no more.
As shown in Figure 8, be the access switching method flow chart in the WLAN (wireless local area network) that the embodiment of the present invention two provides, comprise:
S801: user terminal STA determines that handover measurement is reported; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of the source access point AP of the current access of described STA;
S802: user terminal STA to described source AP sends handover measurement report, to make the access controller AC of management described source AP according to the report of described handover measurement and the access information of at least one neighborhood AP of described source AP determined, determine the target AP after described STA switching, and send the indication message comprising described target AP to described source AP; Described access information comprises: load information;
S803: the described STA indication message comprising target AP forwarded according to described source AP, is switched to described target AP.
Alternatively, in step S801, described STA determines that handover measurement is reported, comprising:
Described STA receives the identification information of at least one neighborhood AP that described source AP sends;
Described STA, according to the identification information of described at least one neighborhood AP, by initiating to measure to described at least one neighborhood AP, determines that handover measurement is reported.
Alternatively, in step S802, described STA sends handover measurement report to described source AP, comprising:
Described STA periodically sends handover measurement report to described source AP; And/or,
Described STA, in the link quality information according to described source AP, after determining that described STA needs to carry out access switching, sends handover measurement report to described source AP.
Alternatively, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
The scheme of the embodiment of the present invention is further illustrated below by a specific embodiment;
As shown in Figure 9, be the access switching flow schematic diagram in the embodiment of the present invention three, comprise:
The neighborhood AP list of the source AP of S901: source AC inner pre-configured STA access, and by webmaster or internal configurations interface, this neighborhood AP list is sent to AP;
Here, the neighborhood AP list of the source AP that source AC is inner pre-configured is according to the pre-determined information of the network planning of WLAN, specifically comprises the routing iinformation of AP and affiliated source AC thereof, as MAC Address, and IP address etc.
S902: source AP at STA in access WLAN process, by the extension field of Probe Response by neighborhood AP list notification to STA;
The link-quality of S903:STA periodic scan access link quality and field AP; After the access link quality of STA or packet loss are lower than setting threshold value, this STA sends handover measurement report to source AP, or STA periodically sends handover measurement report;
The handover measurement received report is transmitted to source AC by S904: source AP;
S905: the source AC handover measurement receiving STA is reported, this STA of uplink downlink Quality estimation according to STA in the report of this handover measurement switches the need of carrying out access, if needed, enters step S906, otherwise enters step S907;
Here, source AC needs the pre-configured signal strength signal intensity relevant to link-quality, threshold value is made an uproar at signal to noise ratio and the end, as the trigger condition of switching.
Neighborhood AP list in S906: source AC traversal handover measurement report, the load information of each neighborhood AP managed, the bandwidth license of user's access in the AC internal queries list of source, and/or, send the load information inquiry request of the neighborhood AP that other neighborhood AC manages to other neighborhood AC, and receive the load information of other neighborhood AC transmission;
S907: source AC permits according to the bandwidth of the load information inquired about or receive, user's access, in conjunction with the handover measurement report that STA reports, determines that this STA carries out the target AP after accessing switching;
S908: source AC issues to be switched target AP information by AP to STA;
The information that S909:STA issues according to source AC, initiate handoff procedure to above-mentioned target AP, concrete switching flow, with reference to existing IEEE 802.11r relevant regulations, repeats no more here.
Based on same inventive concept, the device (AC and STA) that access corresponding to a kind of method with accessing switching in WLAN switches is additionally provided in the embodiment of the present invention, it is similar that the principle of dealing with problems due to the device of the embodiment of the present invention and the embodiment of the present invention access the method switched, therefore the enforcement of this device see the enforcement of method, can repeat part and repeats no more.
As shown in Figure 10, be the AC structural representation that the embodiment of the present invention provides, comprise:
Receiver module 101, the handover measurement report of the described STA that the source access point AP accessed for receiving user terminal STA forwards; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of described source AP;
Determination module 102, for the access information according to the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching; Wherein, described access information comprises load information;
Sending module 103, for the indication message comprising described target AP is sent to described source AP, is transmitted to described STA to make described source AP by described indication message.
Alternatively, described determination module 102 also for, receiver module receive described source AP forward described STA handover measurement report before, determine the identification information of at least one neighborhood AP of described source AP;
Described sending module 103 also for, the identification information of at least one neighborhood AP described in determining is sent to described source AP, to make described STA after the identification information receiving at least one neighborhood AP described in described source AP forwarding, according to the identification information of described at least one neighborhood AP, initiate to measure to described at least one neighborhood AP.
Alternatively, described handover measurement report also comprises the link quality information of described source AP; Described determination module 102 also for, after described receiver module 101 receives the handover measurement report of the described STA that described source AP forwards, before described determination module 102 determines the target AP after described STA switching, according to the link quality information of described source AP, determine that described STA needs to carry out access and switches; And/or,
Described handover measurement report also comprises the type that described handover measurement is reported, the type of described handover measurement report is periodically handover measurement report, or, the timely handover measurement report that described STA reports after determining to need to carry out accessing switching; Described determination module 102 also for, after described receiver module 101 receives the handover measurement report of the described STA that described source AP forwards, before described determination module 102 determines the target AP after described STA switching, determining that the type that described handover measurement is reported is after timely handover measurement is reported, determining that described STA needs to carry out access and switches.
Alternatively, described determination module 102 is specifically for determining the access information of any one neighborhood AP of described source AP according to following steps:
After determining the AP that described any one neighborhood AP manages for described AC, the access information of described any one neighborhood AP of inquiry in the management information of described AC; Or,
After determining the AP that described any one neighborhood AP manages for other AC, send access information inquiry request to other AC described, and receive the access information of described any one neighborhood AP that other AC described sends.
Alternatively, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
Alternatively, described load information comprises one or more in following information:
The quantity of the access STA of setting;
The quantity of actual access STA;
The STA access rate of setting;
The average access rate of actual access STA;
Central processor CPU occupancy.
Alternatively, described access information also comprises: access bandwidth information; Described determination module 102 specifically for: according to link quality information and the load information of at least one neighborhood AP of described source AP, determine at least one first candidate target AP; According to the access bandwidth information of at least one the first candidate target AP described, from least one first candidate target AP described, determine at least one second candidate target AP; According to the link quality information of at least one the second candidate target AP described, from least one second candidate target AP described, determine the target AP after described STA switching.
As shown in figure 11, be the STA structural representation that the embodiment of the present invention provides, this STA comprises:
Determination module 111, for determining that handover measurement is reported; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of the source access point AP of the current access of described STA,
Sending module 112, for sending handover measurement report to described source AP, to make the access controller AC of management described source AP according to the report of described handover measurement and the access information of at least one neighborhood AP of described source AP determined, determine the target AP after described STA switching, and send the indication message comprising described target AP to described source AP; Described access information comprises: load information;
Handover module 113, for the indication message comprising target AP forwarded according to described source AP, is switched to described target AP.
Alternatively, described determination module 111 specifically for:
Receive the identification information of at least one neighborhood AP that described source AP sends; According to the identification information of described at least one neighborhood AP, by initiating to measure to described at least one neighborhood AP, determine that handover measurement is reported.
Alternatively, described sending module 112 specifically for:
Periodically send handover measurement report to described source AP; And/or,
In the link quality information according to described source AP, after determining that described STA needs to carry out access switching, send handover measurement report to described source AP.
Alternatively, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, device (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (22)
1. the access switching method in WLAN (wireless local area network), is characterized in that, the method comprises:
The handover measurement report of the described STA that the source access point AP that access controller AC receives user terminal STA access forwards; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of described source AP;
Described AC, according to the access information of the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching; Wherein, described access information comprises load information;
The indication message comprising described target AP is sent to described source AP by described AC, to make described source AP, described indication message is transmitted to described STA.
2. the method for claim 1, is characterized in that, described AC also comprises before receiving the handover measurement report of the described STA that described source AP forwards:
Described AC determines the identification information of at least one neighborhood AP of described source AP;
The identification information of at least one neighborhood AP described in determining is sent to described source AP by described AC, to make described STA after the identification information receiving at least one neighborhood AP described in described source AP forwarding, according to the identification information of described at least one neighborhood AP, initiate to measure to described at least one neighborhood AP.
3. the method for claim 1, is characterized in that, described handover measurement report also comprises the link quality information of described source AP; Described AC before determining the target AP after described STA switching, also comprises after receiving the handover measurement report of the described STA that described source AP forwards: described AC, according to the link quality information of described source AP, determines that described STA needs to carry out access and switches; And/or,
Described handover measurement report also comprises the type that described handover measurement is reported, the type of described handover measurement report is periodically handover measurement report, or, the timely handover measurement report that described STA reports after determining to need to carry out accessing switching; After described AC receives the handover measurement report of the described STA that described source AP forwards, before determining the target AP after described STA switching, also comprise: described AC is determining that the type that described handover measurement is reported is after timely handover measurement is reported, determines that described STA needs to carry out access and switches.
4. the method for claim 1, is characterized in that, described AC determines the access information of any one neighborhood AP of described source AP according to following steps:
Described AC after determining the AP that described any one neighborhood AP manages for described AC, the access information of described any one neighborhood AP of inquiry in the management information of described AC; Or,
Described AC, after determining the AP that described any one neighborhood AP manages for other AC, sends access information inquiry request to other AC described, and receives the access information of described any one neighborhood AP that other AC described sends.
5. the method for claim 1, is characterized in that, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
6. the method for claim 1, is characterized in that, described load information comprise in following information one or more:
The quantity of the access STA of setting;
The quantity of actual access STA;
The STA access rate of setting;
The average access rate of actual access STA;
Central processor CPU occupancy.
7. the method as described in as arbitrary in claim 1 ~ 6, it is characterized in that, described access information also comprises: access bandwidth information;
Described AC, according to the access information of the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching, comprising:
Described AC, according to the link quality information of at least one neighborhood AP of described source AP and load information, determines at least one first candidate target AP;
Described AC, according to the access bandwidth information of at least one the first candidate target AP described, from least one first candidate target AP described, determines at least one second candidate target AP;
Described AC, according to the link quality information of at least one the second candidate target AP described, from least one second candidate target AP described, determines the target AP after described STA switching.
8. the access switching method in WLAN (wireless local area network), is characterized in that, the method comprises:
User terminal STA determines that handover measurement is reported; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of the source access point AP of the current access of described STA,
User terminal STA sends handover measurement report to described source AP, to make the access controller AC of management described source AP according to the report of described handover measurement and the access information of at least one neighborhood AP of described source AP determined, determine the target AP after described STA switching, and send the indication message comprising described target AP to described source AP; Described access information comprises: load information;
The indication message comprising target AP that described STA forwards according to described source AP, is switched to described target AP.
9. method as claimed in claim 8, it is characterized in that, described STA determines that handover measurement is reported, comprising:
Described STA receives the identification information of at least one neighborhood AP that described source AP sends;
Described STA, according to the identification information of described at least one neighborhood AP, by initiating to measure to described at least one neighborhood AP, determines that handover measurement is reported.
10. method as claimed in claim 8, is characterized in that, described STA sends handover measurement report to described source AP, comprising:
Described STA periodically sends handover measurement report to described source AP; And/or,
Described STA, in the link quality information according to described source AP, after determining that described STA needs to carry out access switching, sends handover measurement report to described source AP.
11. as arbitrary in claim 8 ~ 10 as described in method, it is characterized in that, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
12. 1 kinds of access controller AC, is characterized in that, this AC comprises:
Receiver module, the handover measurement report of the described STA that the source access point AP accessed for receiving user terminal STA forwards; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of described source AP;
Determination module, for the access information according to the report of described handover measurement and at least one neighborhood AP described in determining, determines that described STA carries out accessing the target AP after switching; Wherein, described access information comprises load information;
Sending module, for the indication message comprising described target AP is sent to described source AP, is transmitted to described STA to make described source AP by described indication message.
13. AC as claimed in claim 12, is characterized in that, described determination module also for, described receiver module receive described source AP forward described STA handover measurement report before, determine the identification information of at least one neighborhood AP of described source AP;
Described sending module also for, the identification information of at least one neighborhood AP described in determining is sent to described source AP, to make described STA after the identification information receiving at least one neighborhood AP described in described source AP forwarding, according to the identification information of described at least one neighborhood AP, initiate to measure to described at least one neighborhood AP.
14. AC as claimed in claim 12, is characterized in that, described handover measurement report also comprises the link quality information of described source AP; Described determination module also for, after described receiver module receives the handover measurement report of the described STA that described source AP forwards, before described determination module determines the target AP after described STA switching, according to the link quality information of described source AP, determine that described STA needs to carry out access and switches; And/or,
Described handover measurement report also comprises the type that described handover measurement is reported, the type of described handover measurement report is periodically handover measurement report, or, the timely handover measurement report that described STA reports after determining to need to carry out accessing switching; Described determination module also for, after described receiver module receives the handover measurement report of the described STA that described source AP forwards, before described determination module determines the target AP after described STA switching, determining that the type that described handover measurement is reported is after timely handover measurement is reported, determining that described STA needs to carry out access and switches.
15. AC as claimed in claim 12, is characterized in that, described determination module is specifically for determining the access information of any one neighborhood AP of described source AP according to following steps:
After determining the AP that described any one neighborhood AP manages for described AC, the access information of described any one neighborhood AP of inquiry in the management information of described AC; Or,
After determining the AP that described any one neighborhood AP manages for other AC, send access information inquiry request to other AC described, and receive the access information of described any one neighborhood AP that other AC described sends.
16. AC as claimed in claim 12, is characterized in that, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
17. AC as claimed in claim 12, is characterized in that, described load information comprise in following information one or more:
The quantity of the access STA of setting;
The quantity of actual access STA;
The STA access rate of setting;
The average access rate of actual access STA;
Central processor CPU occupancy.
18. as arbitrary in claim 12 ~ 17 as described in AC, it is characterized in that, described access information also comprises: access bandwidth information;
Described determination module specifically for: according to link quality information and the load information of at least one neighborhood AP of described source AP, determine at least one first candidate target AP; According to the access bandwidth information of at least one the first candidate target AP described, from least one first candidate target AP described, determine at least one second candidate target AP; According to the link quality information of at least one the second candidate target AP described, from least one second candidate target AP described, determine the target AP after described STA switching.
19. 1 kinds of user terminal STA, is characterized in that, this STA comprises:
Determination module, for determining that handover measurement is reported; Wherein, described handover measurement report comprises the link quality information of at least one neighborhood AP of the source access point AP of the current access of described STA,
Sending module, for sending handover measurement report to described source AP, to make the access controller AC of management described source AP according to the report of described handover measurement and the access information of at least one neighborhood AP of described source AP determined, determine the target AP after described STA switching, and send the indication message comprising described target AP to described source AP; Described access information comprises: load information;
Handover module, for the indication message comprising target AP forwarded according to described source AP, is switched to described target AP.
20. STA as claimed in claim 19, is characterized in that, described determination module specifically for:
Receive the identification information of at least one neighborhood AP that described source AP sends; According to the identification information of described at least one neighborhood AP, by initiating to measure to described at least one neighborhood AP, determine that handover measurement is reported.
21. STA as claimed in claim 19, is characterized in that, described sending module specifically for:
Periodically send handover measurement report to described source AP; And/or,
In the link quality information according to described source AP, after determining that described STA needs to carry out access switching, send handover measurement report to described source AP.
22. as arbitrary in claim 19 ~ 21 as described in STA, it is characterized in that, described link quality information comprise signal strength signal intensity, signal to noise ratio and the end make an uproar in one or more.
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