CN1571385A - Method of load balancing for wireless access point - Google Patents
Method of load balancing for wireless access point Download PDFInfo
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- CN1571385A CN1571385A CN 200410017978 CN200410017978A CN1571385A CN 1571385 A CN1571385 A CN 1571385A CN 200410017978 CN200410017978 CN 200410017978 CN 200410017978 A CN200410017978 A CN 200410017978A CN 1571385 A CN1571385 A CN 1571385A
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Abstract
The invention relates to a load balance method of wireless access point. Before wireless terminal accesses to AP, it would compare the quantity of current access user or access data flow of AD in the same local area network and the same SSID with the quantity of wireless terminal accessing to accessed user or AP that has the minimum access flow. Thus, the load balance of local area network AP would be realized and cannot cause some certain AP blocking.
Description
Technical field
The present invention relates to communication field, relate in particular to the load-balancing method of wireless local network connecting point (Wireless AP).
Background technology
Flourish along with computer technology and network technology, network is more and more wider in the application of all trades and professions.Cable network is with its transmission speed height, and advantage such as the brand of product and One's name is legion and technical development speed are fast has the very high popularity and the market share on market.Yet, along with wireless network maturation technically, the continuous increase and the cost decreases of product category, the coming years, wireless network will have bigger development in the whole world.WLAN (wireless local area network) is used more and more, and it will be expanded cable LAN or replace in some cases.Can expect that in the immanent epoch of following information, wireless network will rely on its incomparable flexibility, mobility and extremely strong extendible capacity make that people really enjoy simply, wireless connections easily and efficiently.
Existing WLAN (wireless local area network) is because to insert the user limited, and therefore, same place can occur when concrete networking has a plurality of AP to cover simultaneously, to solve the problem that single AP access customer number is less or flow is less.But the user inserts AP and mainly selects access by the signal power in existing 802.11 agreements, so, when having a plurality of AP to cover simultaneously in same place, the phenomenon that each AP inserts user's inequality or mass flow discrepancy can appear.Some AP number of users or data traffic are excessive, and some AP number of users or data traffic are very few.
U.S. Patent Publication has disclosed three kinds of methods that reach the traffic load equilibrium No. 20030169716 in background technology:
1. traffic load monitors
The traffic load of wireless terminal monitors transceiver base station separately when the traffic load of the transceiver base station that wireless terminal connected increases, will roam into the less base station of other traffic load.
2. check the number of the wireless terminal that is connected
Before connecting, wireless terminal is inquired the number of the wireless terminal that each transceiver base station connects, and is connected on the transceiver base station of wireless terminal minimum number.When signal strength weakening that wireless terminal connected, roam into the high transceiver base station of other signal strength signal intensity.Mainly be to judge that according to signal strength signal intensity and the number of users of each AP in the network terminal can be upgraded connection according to the variation of signal after connection.
3. connect the destination register method
An independent transceiver base station is registered to wireless terminal and connects the destination as one, thereby the connection destination is fixed on the base station, makes it can't realize roaming, thereby makes the connection of wireless terminal reach load balancing.
First and second kinds of methods have increased the burden of wireless network owing to will make wireless terminal through the transceiver base station internetwork roaming of being everlasting according to traffic load or signal power, cause blocking up of network easily.And the third method can't realize roaming, when the signal of the transceiver base station that wireless terminal connected is too weak, and normal transceive data just.
No. the 20030169716th, U.S. Patent Publication has disclosed a kind of method of network connection according to the problems referred to above, and wireless terminal is connected arrive a plurality of transceiver base stations simultaneously, and by wherein at least one realization data communication.So just increased the quantity of the wireless terminal that each transceiver base station connected.
Summary of the invention
The object of the present invention is to provide the access method for equalizing load that solves under the condition that a plurality of AP cover simultaneously.
For achieving the above object, in WAP (wireless access point) of the present invention (AP) load-balancing method, WAP (wireless access point) is in a local area network (LAN) and have same SSID, and it judges that specifically flow process is:
1) regularly obtains the parameter of the representative load of AP;
2) broadcast the parameter of the representative load of current AP by the upper united mouth;
3) balancing received load message, the AP that obtains identical SSID represents the parameter of load at present;
4) set up the parameter list that identical SSID AP represents load;
5) receive the parameter of relatively representing load after new wireless subscriber terminal access is asked;
6), then allow new user to insert if represent the minimum AP of the parameter of load; Otherwise, refuse new user and insert.
The parameter of wherein said representative load can be the data traffic of access customer number amount or AP.The user can select according to corresponding needs.
The present invention uses simple protocol to realize the mutual of number of users between the AP of identical SSID under the same local area network (LAN) or data traffic, obtains the condition that whether is allowed to when new user inserts AP.Reach effective utilization of device resource in this zone, and the assurance of user's cut-in quality.By the upper united mouth swap data of HUB, do not take wireless frequency range between the AP.
Description of drawings
Fig. 1 is the flow chart of WAP (wireless access point) of the present invention (AP) load-balancing method;
Fig. 2 is the network topological diagram of WAP (wireless access point) of the present invention (AP) load-balancing method hardware device;
Fig. 3 is the interaction diagrams of message between WAP (wireless access point) of the present invention (AP) load-balancing method AP;
Fig. 4 is the schematic diagram of the load balancing broadcasting packet form of WAP (wireless access point) of the present invention (AP) load-balancing method.
Embodiment
The present invention is mutual by access customer number or data traffic between the WAP (wireless access point) (AP) of same services district identifier (SSID) under the same local area network (LAN), make AP judge that new user is inserted request corresponding foundation, AP can collect current access customer number or the data traffic of self according to the requirement of keeper to concrete application.And in local area network (LAN), broadcast by corresponding broadcasting packet, receive other AP of broadcast message, by the analysis protocol content, AP current access customer number or data traffic obtain transmitting messages, after gathering, each AP can safeguard a current access user data table or a data flow scale about the AP of identical SSID under the present same local area network (LAN).New wireless user to these AP in some AP send when inserting request, this AP will judge whether to allow the access request of this new user to it according to the tables of data that it is safeguarded.
See also Fig. 1, it judges that specifically flow process is:
1) regularly obtains the current data flow of AP access customer number or AP;
2) broadcast the current data flow of current AP access customer number or AP by the upper united mouth;
3) balancing received load message obtains the present number of users of AP of identical SSID or the current data flow of AP;
4) set up the access customer number order table of identical SSID AP or the current data flowmeter of AP;
5) receive that new user inserts request back relatively access customer number or data traffic;
6), then allow new user to insert if insert minimum AP or the minimum AP of preceding flow of user; Otherwise, refuse new user and insert;
The present invention is just according to data traffic or access customer number, as long as wireless terminal can receive the signal of AP, and gets final product (IEEE802.11 agreement regulation) within wireless terminal access thresholding.
Above judgement can be divided into dual mode, and a kind of access customer number that is based on, another kind are based on data traffic.Dual mode thought when realizing is identical, just the basis for estimation difference that adopts.
The AP specific explanations of identical SSID sees also Fig. 2 under the same local area network (LAN) that the present invention mentioned, the network topology of hardware device:
1) requires AP2 to pass through hub (HUB) 3, converge in the same local area network (LAN);
2) require AP2 to have identical SSID;
3) require AP2 according to common overlay area, wireless terminal can insert WLAN (wireless local area network) by corresponding AP.
Service Area Identifier symbol SSID (Service Set Identifier) provides the method on a sign WLAN (wireless local area network) border, and the wireless device that all SSID are identical is in the wireless network.Therefore do not know that SSID can't visit specific WLAN (wireless local area network).Wireless stations must be shown correct SSID, and is identical with the SSID of radio access point AP, could visit AP; If the SSID that shows is different with the SSID of AP, AP will refuse it by the online of this service area so.
The interaction flow of message between load-balancing method AP of the present invention sees also Fig. 3:
1) according to setting, fixed time broadcast AP access customer number or data traffic infomational message;
2) AP receives access customer number or the data traffic infomational message that other AP broadcast out in the local area network (LAN);
3) judge whether it is the message that the AP of identical SSID sends; If not, be direct dropping packets, if then enter next step;
4) whether the AP MAC Address of receiving in information table, does not then add new clauses and subclauses;
5) if the AP MAC Address of receiving in information table, is judged time that message sends whether early than time of message in the information table, if, dropping packets then; If not then access customer number entrained in the message or data traffic are updated in the information table.
Because a plurality of AP receive among the same LAN, when receive at every turn upgrade message after, the newspaper that need acknowledge receipt of is up-to-dately to be sent by other AP, if updated data table, otherwise dropping packets.
Load balancing broadcasting packet form sees also Fig. 4, and message is explained as follows:
1) byte 0-byte 5: target MAC (Media Access Control) address;
2) byte 6-byte 11: source MAC;
3) byte 12-byte 13: protocol type, use " BB BB " here.
4) byte 14-byte 15: access customer number;
5) byte 16-byte 23: access flow;
6) byte 24-byte 27: the time mark of message;
7) SSID of byte 28-byte 47:AP.
Before relevant, in the case technology, mainly be to judge that according to signal strength signal intensity and the number of users of each AP in the network terminal can be upgraded connection according to the variation of signal after connection.The present invention is linked on the AP of load minimum wireless terminal, realized the load balancing of the AP in the local area network (LAN), the foundation of judging the load minimum is access customer number or data traffic, method of the present invention is behind AP in the wireless terminal connection, (this is the function of 802.11 agreements and network interface card driving itself if the AP signal is not less than the connection thresholding, do not relate to the present invention), can not reconnect other AP, reduced the number of times of roaming.When the signal of the AP that wireless terminal connected was lower than the connection thresholding, wireless terminal re-executed process of the present invention, is connected on the AP of load minimum.By the upper united mouth swap data of HUB, do not take wireless frequency range between the AP.
Claims (10)
1. the load-balancing method of a WAP (wireless access point) (AP), wherein WAP (wireless access point) is in a local area network (LAN) and have same service area sign symbol (SSID), and it comprises the steps:
1) regularly obtains the parameter of the representative load of AP;
2) broadcast the parameter of the representative load of current AP by the upper united mouth;
3) AP balancing received load message obtains the parameter of representative load of the AP of identical SSID;
4) set up the parameter list of the representative load of identical SSID AP;
5) receive the parameter of relatively representing load after new wireless subscriber terminal access is asked;
6), then allow new user to insert if represent the minimum AP of the parameter of load; Otherwise, refuse new user and insert.
2. WAP (wireless access point) as claimed in claim 1 (AP) load-balancing method is characterized in that: represent the manufacturing process of the parameter list of load to comprise the steps:
1) fixed time broadcast AP represents the infomational message of the parameter of load;
2) AP receives the infomational message of the parameter of representing load in the local area network (LAN);
3) judge whether it is identical SSID, if inequality, if direct dropping packets then is identical then enter next step;
4) judge time that message sends whether early than time of existing message in the information table, if, dropping packets then; If not, then with the parameter update of representative load entrained in the message in information table.
3. WAP (wireless access point) as claimed in claim 2 (AP) load-balancing method, it is characterized in that, the 3rd) have the following steps after the step: whether APMAC (media interviews control) address of judging message is in information table, if not then add new clauses and subclauses, if have, then directly enter next step.
4. WAP (wireless access point) as claimed in claim 1 (AP) load-balancing method is characterized in that the signal strength signal intensity of AP is greater than the access thresholding of wireless terminal.
5. WAP (wireless access point) as claimed in claim 4 (AP) load-balancing method is characterized in that wireless terminal is linked into after the AP, and after the signal strength signal intensity of this AP was lower than the access thresholding, wireless terminal carried out process as claimed in claim 1 again and inserts AP.
6. as one of any described WAP (wireless access point) (AP) load-balancing method of claim 1 to 5, it is characterized in that representing the parameter of load is that AP inserts number of users.
7. WAP (wireless access point) as claimed in claim 6 (AP) load-balancing method is characterized in that described access customer number amount message comprises following information at least: the SSID of the time mark of target MAC (Media Access Control) address, source MAC, protocol type, message, access customer number amount and AP.
8. as one of any described WAP (wireless access point) (AP) load-balancing method of claim 1 to 5, it is characterized in that representing the parameter of load is the data traffic of AP.
9. WAP (wireless access point) as claimed in claim 8 (AP) load-balancing method is characterized in that described incoming data stream amount message comprises following information at least: the SSID of the time mark of target MAC (Media Access Control) address, source MAC, protocol type, message, incoming data stream amount and AP.
10. as one of any described WAP (wireless access point) (AP) load-balancing method of claim 1 to 5, it is characterized in that described incoming data stream amount message comprises following information at least: it is number of users or data traffic that the time mark of target MAC (Media Access Control) address, source MAC, protocol type, data traffic, access customer number amount, message and the SSID of AP, user can select to represent the parameter of load.
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| CNB2004100179785A CN100423501C (en) | 2004-04-27 | 2004-04-27 | Method of load balancing for wireless access point |
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| CNB2004100179785A CN100423501C (en) | 2004-04-27 | 2004-04-27 | Method of load balancing for wireless access point |
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| EP1670234A3 (en) * | 2000-05-19 | 2006-08-30 | Lucent Technologies Inc. | Wireless LAN with load balancing |
| EP1552711A4 (en) * | 2002-09-17 | 2010-04-07 | Broadcom Corp | Method and system for optimal load balancing in a hybrid wired/wireless network |
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