CN100417114C - Method for realizing load balance between access devices in WLAN - Google Patents
Method for realizing load balance between access devices in WLAN Download PDFInfo
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- CN100417114C CN100417114C CNB2005100334338A CN200510033433A CN100417114C CN 100417114 C CN100417114 C CN 100417114C CN B2005100334338 A CNB2005100334338 A CN B2005100334338A CN 200510033433 A CN200510033433 A CN 200510033433A CN 100417114 C CN100417114 C CN 100417114C
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Abstract
The present invention relates to a method for realizing load balance among access equipment in a wireless local area network. Each AP for covering the same area is provided with an access priority and a priority modification strategy. Self access priority is modified by each AP according to self priority modification strategy. The neighbor information of adjacent APs is maintained on each AP. The neighbor information maintained per se is updated by each AP by detecting a link between every two APs or receiving information which is periodically broadcast by a neighbor AP via a wireless channel. The status of a self access website is determined by each AP by comparing the self priority with the priority of the adjacent AP. The defect that loads among access equipment in the wireless local area network in the prior art are not balanced or the transmission of bulk redundant information and inflexibility can be caused by adopting a wired interconnection method to transmit load information is overcome by the present invention. The load balance of access equipment is realized conveniently and flexibly.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method that in WLAN (wireless local area network), realizes load balancing between access device.
Background technology
WLAN (WLAN (wireless local area network)) utilizes wireless technology to transmit data, speech and vision signal aloft, and as a kind of replacement scheme or the extension of traditional wiring network, it can make the user arbitrarily cable network be expanded and extend.From individual and table limit wireless access, the transmission of arriving the wireless data communication of cross-region makes the user obtain information whenever and wherever possible, has improved the service efficiency of network.
Be illustrated in figure 1 as the wlan network structural representation, in wlan network, a wireless aps (WAP (wireless access point)) constitutes a BSS (Basic Service Set), identifies by BSSID (the Basic Service Set identification code generally is the MAC Address of AP).The service that AP can provide identifies (services set identification code, the i.e. character string of the sign AP service that can provide) by SSID, and a plurality of AP can use identical SSID.STA (website for example possesses the notebook of radio function) can conduct interviews to the Internet resources beyond BSS and the BSS by DS (dissemination system) service that AP provides.
In the wireless lan (wlan) system, STA has dual mode to select AP to insert: a kind of is to select to insert by passive mode, and a kind of is to select to insert by active mode.Passive access way is that STA scans each channel, by the AP among beacon (Beacon) the frame discovery WLAN that receives the AP timed sending, selects an AP to insert then from the result of scanning.Initiatively access way is that STA sends the AP that the request of inquiring after (Probe Request) frame is inquired after this SSID of support in the network according to SSID, and STA selects an AP to insert according to inquiring after the result.
Because WLAN is a technology of sharing medium, when the access user increased, the competition in the middle of the STA will increase, and distributes each user's bandwidth to descend.Therefore, in actual applications,, can adopt a plurality of AP to be configured in different channels and cover same zone and carry out networking in order to increase the user capacity of WLAN.At this moment, have only the load between the AP bandwidth resources to be fully utilized equilibrium.
Be illustrated in figure 2 as the AP channel that covers the same area figure is set, because AP is when being operated in same channel, the signal between the AP can the phase mutual interference, and the AP that therefore covers the same area need be operated in separate channel.With 802.11b is example, can use 3 separate channels: 1 channel, 6 channels and 11 channels.
For STA, regardless of being that passive mode inserts AP or active mode inserts AP, STA does not consider the load condition of AP when selecting to insert AP, and the AP that STA or selection signal are the strongest inserts, or the AP that selects at random inserts.For AP, owing to there is not to announce mutually between the AP agreement of the load of oneself, therefore general way is at present, does not communicate between the AP, and whether the maximum user of each AP separate configurations oneself inserts STA with decision.After reaching maximum, the AP access customer number just can refuse to insert new user.The shortcoming of this method is to have simultaneously a plurality of AP access service is provided, and STA may always select the strongest one of signal to insert.Like this, make that the load between the AP can't be balanced, the STA that some AP access occurs is too much, causes decreased performance, and the situation of some AP free time.
At present, for the load balancing set standard of neither one also,, have no idea to play the effect of load balancing between the AP of different vendor though also holding load equilibrium of present many AP all is to use self-defining proprietary protocol.
Undertaken wired interconnectedly between the employing AP that prior art has by Ethernet etc., exchange the load information of oneself, thereby carry out load balancing.The load information of AP Real-time Notification oneself comprises the number of users of AP connection, existing flow information etc.For the AP that carries out load balancing by number of users, need be when user's going on line or off line each time, the user profile of other AP announcements in network in real time oneself; For carry out balanced AP by flow,, need the flow information of other AP announcements in network in real time oneself when changes in flow rate surpasses certain particle.
The shortcoming of prior art is: because the AP that is connected among the same LAN by Ethernet is a lot, under the overlapped situation of AP coverage, STA can search a plurality of AP, because the randomness that STA inserts, make that the load between the AP can't be balanced, the STA that some AP access occurs is too much, causes decreased performance, and the situation of some AP free time.If use between AP wired mode to transmit load information, the problem of existence is, wired interconnected AP might not cover same zone, and AP can't judge which AP and the same scope of own covering, and there is a large amount of redundancies in thus obtained neighbor information.And because information such as the number of users of AP, flow are real time alterings, AP need constantly notify the load information of adjacent AP oneself, has a large amount of information transmission.Simultaneously, use Ethernet to carry out the interconnected workload that will increase networking equipment and wiring of AP, be not suitable for flexible networking, wired transmission limit information installation and the occupation mode of AP.
Summary of the invention
Technical problem to be solved by this invention is: it is unbalanced to overcome in the prior art WLAN (wireless local area network) between access device load, or adopt wired mutual contact mode transmission load information can cause the transmission of bulk redundancy information, inflexible shortcoming, the method that realizes load balancing in a kind of WLAN (wireless local area network) between access device is provided, thereby realizes the load balancing of access device easily and flexibly.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
This method that in WLAN (wireless local area network), realizes load balancing between access device, may further comprise the steps: to each WAP (wireless access point) configuration access priority and the priority change strategy that covers the same area, each WAP (wireless access point) is according to the access priority of the priority change strategy change oneself of oneself; On each WAP (wireless access point), safeguard the neighbor information of adjacent WAP (wireless access point), and each WAP (wireless access point) is upgraded regularly to the neighbor information of oneself safeguarding; WAP (wireless access point) passes through to compare the priority of own and adjacent WAP (wireless access point), determines oneself to insert the state of website, only is in the WAP (wireless access point) ability broadcast beacon information of permission access state and the request of inquiring after of response website.
WAP (wireless access point) is by regularly upgrading the neighbor information of oneself safeguarding by the information of wireless channel broadcasting link detecting between WAP (wireless access point) or reception neighbours WAP (wireless access point); When WAP (wireless access point) can't receive the information of some adjacent WAP (wireless access point) in a period of time, or after being checked through the link down of some adjacent WAP (wireless access point), described adjacent WAP (wireless access point) can be deleted from the neighbor information of being safeguarded.If there is not the WAP (wireless access point) of equal priority among WAP (wireless access point) current priority maximum and the neighbours, then the WAP (wireless access point) access state inserts for allowing, and remaining inserts for not allowing; When existing a plurality of WAP (wireless access point) current priorities to be maximum, each WAP (wireless access point) adopts the identical own access state of strategy decision, guarantees currently to have only the access state of a WAP (wireless access point) to be the permission access.
The strategy that WAP (wireless access point) can use access customer number to change as priority, configure user inserts threshold value, when the WAP (wireless access point) access customer number reaches this access threshold value, priority decline one-level.The WAP (wireless access point) that allows access state access state become do not allow to insert after, continue broadcast beacon frame, but no longer respond the new request of inquiring after, insert websites until all of this WAP (wireless access point) and roll off the production line.
Website only is in the coverage range of wireless access point, and WAP (wireless access point) is not when allowing access state, if this WAP (wireless access point) receives the request of inquiring after of same website continuously several times, then this WAP (wireless access point) can respond, and guarantees that website always can be linked into a WAP (wireless access point).
Can adopt broadcasting or multicast mode to communicate between the described WAP (wireless access point), interactive information between the WAP (wireless access point) is encrypted, and before mutual precedence information, authentication mutually between the WAP (wireless access point), set up communication link, have only when the state between WAP (wireless access point) is in to connect when authenticating, can transmit precedence information between the WAP (wireless access point).
When WAP (wireless access point) adds network or state change, can adopt the state notifying message initiatively to notify adjacent WAP (wireless access point) by wireless channel, make adjacent WAP (wireless access point) upgrade the neighbor information of oneself, described state notifying message comprises media access control address, services set identification code and the access priority of WAP (wireless access point) at least.When WAP (wireless access point) exits network, can use and withdraw from message and initiatively notify adjacent WAP (wireless access point) by wireless channel, make adjacent WAP (wireless access point) upgrade the neighbor information of oneself, describedly withdraw from media access control address and the services set identification code that message comprises WAP (wireless access point) at least.
When WAP (wireless access point) is supported a plurality of services set identification code, can be each services set identification code maintenance of neighbor information, access priority and access state.
Beneficial effect of the present invention is: the invention provides between a kind of AP and inform wireless access information mutually by wireless channel, and realize the method for load balancing between the AP on this basis.AP possesses the ability of neighbours' discovery and MANET, can adjust the access state of self according to network condition automatically, dynamically realizes the load balancing between the AP; Can support under a plurality of SSID environment simultaneously, the load balancing between the AP, and can guarantee the fail safe of information interaction between the AP to prevent the existence of rogue AP.
Each AP can be independently according to the access priority of own configuring condition decision oneself, each AP can be provided with the access thresholding of oneself neatly, as according to the maximum number of user access, according to the maximum stream flow access etc., can support multiple load balancing strategy.When having only the load of AP to cause the AP access priority to change, AP just need notify other AP, and need not to notify other AP when each user's going on line or off line or flow change, and makes that the interactive information between AP reduces, and realizes the load balancing of access device easily and flexibly.
Description of drawings
Fig. 1 is the wlan network structural representation;
Fig. 2 is provided with schematic diagram for the AP channel that covers the same area;
Fig. 3 provides the access service structural representation simultaneously for a plurality of AP in the same area of the present invention;
The protocol stack diagram of Fig. 4 for communicating by letter between the AP of the present invention;
Fig. 5 is connect state machine schematic diagram between the AP of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
For overcoming the deficiencies in the prior art, the present invention defines the agreement of informing wireless access information between a kind of AP by wireless channel mutually, and realizes the load balancing between the AP on this basis.The wireless channel that communicates between the AP can adopt different frequencies or channel with the channel that is used for user's access, also can be identical, but should guarantee that same channel is used in communication between each AP, otherwise is difficult to guarantee to receive the message of other AP.
Be illustrated in figure 3 as that a plurality of AP provide the access service structural representation simultaneously in the same area, each WAP (wireless access point) configuration access priority and the priority change strategy of the present invention to covering the same area, each WAP (wireless access point) is according to the access priority of the priority change strategy change oneself of oneself; On each WAP (wireless access point), safeguard the neighbor information of adjacent WAP (wireless access point), each WAP (wireless access point) is passed through the link detecting between WAP (wireless access point) or is received the information that neighbours' WAP (wireless access point) is regularly broadcasted by wireless channel, the neighbor information of oneself safeguarding is upgraded, WAP (wireless access point) is by the priority of relatively more own and adjacent WAP (wireless access point), determine oneself to insert the state of website, only be in WAP (wireless access point) ability broadcast beacon information that allows access state and the request of inquiring after that responds website.
Below implementation procedure of the present invention is specifically described:
1, configuration access priority and priority change strategy
For each AP configuration access priority, and priority change strategy.As, can configure user insert threshold value, when the AP access customer number reaches the access threshold value, priority decline one-level.The priority that each AP can dispose oneself separately changes strategy, and as the strategy that uses access customer number to change as priority, the priority rule change of AP is as follows:
A) after the STA successful connection, the current access customer number of AP+1; If the current access customer number＞=threshold value of AP, priority-1; Under other situations, priority is constant;
B) after STA disconnects and connecting, AP current access customer number-1; If AP active user number=threshold value-1, priority+1; Under other situations, priority is constant.
2, maintenance of neighbor information
Need safeguard adjacent AP information for AP that can the holding load equilibrium, each AP with load balance ability is adding network, state changes and answering the adjacent AP of proactive notification when exitting network, so that adjacent AP upgrades the neighbor information of oneself.Simultaneously, each AP need safeguard the neighbor table of oneself, comprises the Link State between AP is detected, and the perhaps information of AP periodic broadcasting oneself is so that neighbor AP regularly wears out to the neighbor information of oneself safeguarding.After can't receiving the information of some AP in a period of time, or after being checked through the link down of some AP, this AP should be deleted from neighbor table.
Load sharing between the AP is a unit with same SSID, is being configured to carry out load sharing between the AP of same SSID.For the situation of supporting many SSID, AP needs to safeguard independent neighbor information table, access priority and access state for each SSID.
3, priority ratio and the determining of access state
Pass through to compare priority of oneself and the priority of adjacent AP between AP, whether decision inserts STA.If the priority of AP is identical, can determine that an AP has the right of effective access STA based on identical rule between the AP, as, can select the less AP of MAC Address to have the right of preferential access STA.
When the AP access priority changes, need notify all neighbours.And the neighbor information that receives according to oneself, change access state.Each AP has determined the access state of oneself according to the priority of own and adjacent AP.Following rule assurance is current has only the access state of an AP oneself to be set to allow to insert (enable), can insert the user.
A) if there is not the AP of equal priority among AP current priority maximum and the neighbours, then the AP access state is enable;
B) when existing a plurality of WAP (wireless access point) current priorities to be maximum, WAP (wireless access point) adopts the access state of identical strategy decision oneself, as, select media interviews control (MAC) address reckling, its WAP (wireless access point) access state is enable;
C) based on b) selected strategy, if AP current priority maximum, but in equal priority AP, have the littler AP of MAC Address, then the AP access state is disable;
D) access state of AP is disable under other situation;
Exist the priority of any one AP to change in neighbor AP, or topological structure is when changing, all neighbor AP all need to adjust according to above rule the access state of oneself.The change of topological structure comprises:
A) new AP joins in the network;
B) AP initiatively withdraws from from network;
C) situations such as sudden power appear in AP, can not initiatively withdraw from from network, and are when other AP detects certain AP and do not have signal for a long time, that it is aging from neighbor table.
In sum, when self priority changes, neighbor AP priority changes or neighbours' topology change (have AP new add AP withdraws from or by aging) time, AP all needs to adjust the access state of oneself.
Have only the AP of the current enable of being in state could broadcast the request of inquiring after of beacon (beacon frame) information and response STA.Because STA generally is by receiving the beacon information maintenance of AP and being connected of AP, in order to guarantee it is that the AP of enable state is after access state becomes disable, the STA that has connected does not roll off the production line, should continue to broadcast the beacon frame, but no longer respond the new request of inquiring after, roll off the production line until all STA.At this moment,, the request of inquiring after of STA can not be responded, new STA can not be inserted though this AP can broadcast beacon.
When STA inserts, can search for beacon information.Owing to only can have an AP broadcasting beacon information in the coverage, therefore, guarantee that STA can only insert an AP.Perhaps, STA at first initiates Probe Request (request of inquiring after) in order to search out proper A P.In the time of in STA is in a plurality of AP superimposed coverage area, a plurality of AP receive Probe Request simultaneously, and whether each AP inserts corresponding STA according to the access state decision of self.Current access state is that the AP of enable sends Probe Response (inquiring after response) to STA.
When STA only was in the coverage of an AP, if the access state of this AP just in time is enable, then AP can insert the user.If the access state of this AP just in time is in the disable state, in order to guarantee that STA always can be linked into an AP, if be in the continuous probe request that receives same STA for n time of the AP of disable state, the AP that is in the disable state can respond.
If the message propagation between the AP transmits with form expressly, the problem that faces is, rogue AP can oneself priority be set to the highlyest, and then the user always is linked on the rogue AP, and legal AP then is in idle state.Therefore, the message transmission between the AP needs the assurance of security mechanism.Because 802.11 control frames and management frames all can not be encrypted, so interactive information is carried in 802.11 Frames between the AP, can use WEP/WPA etc. to encrypt, also can adopt other encryption method.802.11 protocol layer provides functions such as data encryption, completeness check, playback protection by supporting agreements such as WEP/802.11i.Be illustrated in figure 4 as the protocol stack diagram of communicating by letter between AP of the present invention, MAC (media interviews control) layer adopts 802.11MAC, thereon by enhancing agreements such as 802.11i provide safety etc. function, the interaction protocol between AP as Data-carrying in the data of 802.11MAC frame.
In the middle of AP, before the mutual precedence information, need mutual authentication between the AP, set up communication link.Set up the method for communication link, the authentication between the AP can be used the mechanism such as PSK, 802.1x of 802.11i definition.In verification process, negotiate the information such as key of data encryption between the AP between the AP.
Be illustrated in figure 5 as connect state machine schematic diagram between AP, the connection status between the AP is divided into:
A) do not connect; Do not set up communication link between the AP;
B) connect, unverified; Set up communication link between the AP, but do not carried out mutual authentication between the AP; In this stage, can remove link between the AP, not-connected status is got back in the connection of promptly cancelling between the AP.
C) connect, authenticate; After having carried out mutual authentication between the AP, AP enters verified status.In this stage, can remove link between the AP, not-connected status is got back in the connection of promptly cancelling between the AP.
Have only when the state between AP is in to connect, when authenticating, can transmit precedence information between the AP; Guaranteed safety of data between the AP thus.AP sets up neighborhood according to the precedence information that receives, has guaranteed that rogue AP can't scatter false message information.
Adopt broadcasting or multicast (comprising Layer 2 Multicast and three layers of multicast) to communicate between the AP of the present invention.Can define two kinds of messages---state notifying message and withdraw from message.When AP added network and state change, the adjacent AP of user mode notice message notifying after adjacent AP receives this state notifying message, upgraded neighbor information and the access state of self.For safeguarding the neighbor information of AP, AP is periodically with broadcasting or multicast mode transmit status notice message.As not receiving the state notifying message of certain AP within a certain period of time, this AP is deleted from the neighbours of oneself, and upgrade the access state of oneself.At this moment AP also can need not periodically transmit status notice message by the detection of linking status between the AP is finished for neighbours' detection.When AP exits network, use and withdraw from message, notify adjacent AP.
The communication protocol message format is defined as follows between AP:
0 1 2 3
Wherein: each message all needs to comprise type of message code, message identification Identifier and message length information between AP.Other information that need between the AP to transmit are carried in the message as Attributes.
The code:1 byte is used to identify type of message:
1 is status-notify (state notifying)
2 are leave (leaving)
The Identifier:1 byte, message identification.
The Length:2 byte.All message lengths that comprise Code, Identifier, Length and Attribute.The message minimum length is 20, and maximum length is 4096.
Attributes comprises the MAC Address of AP, the SSID of AP, the access priority of AP.
(1) type of message
The value in message Code territory has determined type of message.For the state notifying message, the code type is status-notify.AP state notifying message must comprise the MAC Address of AP, the SSID of AP, the access priority of AP.Wherein, the MAC Address of AP uses the SSID of AP_id attribute, AP to use the access priority of AP_ssid attribute, AP to use the AP_priority attribute.
For withdrawing from message, the code type is leave; AP withdraws from message must comprise the MAC Address of AP, the SSID of AP.Wherein, the MAC Address of AP uses the SSID of AP_id attribute, AP to use the AP_ssid attribute.
(2) attribute Attributes
The TLV form is adopted in the design of message content.Its form is:
0 1 2
| Type | Length | Value |
The Type:1 byte, attribute type;
Length:2 byte, attribute length is represented the length of this attribute.
Value: the value of attribute.The value type is divided into text, string, address, integer, time.
Introduce the state notifying message below and withdraw from the attribute that defines in the message:
1) Ap_id attribute
Be used to identify the MAC Address of AP; Type is string, and length is 48bit
0 1 2 3
2) Ap_ssid attribute
Be used to identify the SSID of AP; Type is string, and length is specified by attribute length.
3) Ap_priority attribute
Be used to identify the access priority of AP; Type is integer, and length is 4 bytes.
0 1 2 3
| Ap_priority |
Value: priority increases with numeral and reduces, and 0 is greatest priority.
The invention provides between a kind of AP and inform wireless access information mutually, and realize the method for load balancing between the AP on this basis by wireless channel.AP possesses the ability of neighbours' discovery and MANET, can adjust the access state of self according to network condition automatically, dynamically realizes the load balancing between the AP; Can support under a plurality of SSID environment simultaneously, the load balancing between the AP, and can guarantee the fail safe of information interaction between the AP to prevent the existence of rogue AP.
Each AP can be independently according to the access priority of own configuring condition decision oneself, each AP can be provided with the access thresholding of oneself neatly, as according to the maximum number of user access, according to the maximum stream flow access etc., can support multiple load balancing strategy.When having only the load of AP to cause the AP access priority to change, AP just need notify other AP, and need not to notify other AP when each user's going on line or off line or flow change, and makes that the interactive information between AP reduces,
The present invention is applicable to the AP that covers the same area, the different channel of these AP configurations, but SSID, identical to authentication mode, the cipher mode of STA, the situation that STA can select any AP to insert.Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (10)
1. a method that realizes load balancing in WLAN (wireless local area network) between access device is characterized in that, may further comprise the steps:
To each WAP (wireless access point) configuration access priority and the priority change strategy that covers the same area, each WAP (wireless access point) is according to the access priority of the priority change strategy change oneself of oneself;
On each WAP (wireless access point), safeguard the neighbor information of adjacent WAP (wireless access point), and each WAP (wireless access point) is upgraded regularly to the neighbor information of oneself safeguarding;
WAP (wireless access point) passes through to compare the priority of own and adjacent WAP (wireless access point), determines oneself to insert the state of website, only is in the WAP (wireless access point) ability broadcast beacon information of permission access state and the request of inquiring after of response website.
2. the method that realizes load balancing in WLAN (wireless local area network) between access device according to claim 1 is characterized in that: WAP (wireless access point) is by regularly upgrading the neighbor information of oneself safeguarding by the information of wireless channel broadcasting link detecting between WAP (wireless access point) or reception neighbours WAP (wireless access point); When WAP (wireless access point) can't receive the information of some adjacent WAP (wireless access point) in a period of time, or after being checked through the link down of some adjacent WAP (wireless access point), described adjacent WAP (wireless access point) is deleted from the neighbor information of being safeguarded.
3. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 1 and 2, it is characterized in that: if there is not the WAP (wireless access point) of equal priority among WAP (wireless access point) current priority maximum and the neighbours, then the WAP (wireless access point) access state inserts for allowing, and remaining inserts for not allowing; When existing a plurality of WAP (wireless access point) current priorities to be maximum, each WAP (wireless access point) adopts the identical own access state of strategy decision, guarantees currently to have only the access state of a WAP (wireless access point) to be the permission access.
4. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 3, it is characterized in that: the strategy that WAP (wireless access point) uses access customer number to change as priority, configure user inserts threshold value, when the WAP (wireless access point) access customer number reaches this access threshold value, priority decline one-level.
5. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 3, it is characterized in that: the WAP (wireless access point) that allows access state access state become do not allow to insert after, continue broadcast beacon frame, but no longer respond the new request of inquiring after, insert websites until all of this WAP (wireless access point) and roll off the production line.
6. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 3, it is characterized in that: website only is in the coverage range of wireless access point, and described WAP (wireless access point) is not when allowing access state, if this WAP (wireless access point) receives the request of inquiring after of same website continuously several times, then this WAP (wireless access point) responds, and guarantees that website always can be linked into a WAP (wireless access point).
7. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 3, it is characterized in that: adopt broadcasting or multicast mode to communicate between the described WAP (wireless access point), interactive information between the WAP (wireless access point) is encrypted, and before mutual precedence information, authentication mutually between the WAP (wireless access point), set up communication link, have only when the state between WAP (wireless access point) is in to connect when authenticating, can transmit precedence information between the WAP (wireless access point).
8. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 7, it is characterized in that: when WAP (wireless access point) adds network or state change, adopt the state notifying message initiatively to notify adjacent WAP (wireless access point) by wireless channel, make adjacent WAP (wireless access point) upgrade the neighbor information of oneself, described state notifying message comprises media access control address, services set identification code and the access priority of WAP (wireless access point) at least.
9. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 7, it is characterized in that: when WAP (wireless access point) exits network, use is withdrawed from message and is initiatively notified adjacent WAP (wireless access point) by wireless channel, make adjacent WAP (wireless access point) upgrade the neighbor information of oneself, describedly withdraw from media access control address and the services set identification code that message comprises WAP (wireless access point) at least.
10. the method that in WLAN (wireless local area network), realizes load balancing between access device according to claim 3, it is characterized in that: when WAP (wireless access point) is supported a plurality of services set identification code, be each services set identification code maintenance of neighbor information, access priority and access state.
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| CN101419562B (en) * | 2008-12-04 | 2010-06-02 | 浙江大学 | Hardware PRI queue implementing method for balancing load and performance |
| US8958812B2 (en) | 2008-09-24 | 2015-02-17 | Huawei Technologies Co., Ltd. | Cell load balancing method and devices thereof |
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