CN101019378B - Accelerating discovery of access points in a wireless local area network - Google Patents
Accelerating discovery of access points in a wireless local area network Download PDFInfo
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- CN101019378B CN101019378B CN200580030245.8A CN200580030245A CN101019378B CN 101019378 B CN101019378 B CN 101019378B CN 200580030245 A CN200580030245 A CN 200580030245A CN 101019378 B CN101019378 B CN 101019378B
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Abstract
A method for accelerating discovery of access points (APs) in a wireless local area network begins by transmitting an advertisement packet by an AP via at least one channel other than a channel on which the AP transmits beacon signals. The advertisement packet is received by a station (STA), which then determines whether to associate to the transmitting AP. The advertisement packet can include reassociation information, such that the STA can associate to the AP based on the information in the advertisement packet, or timing information, such that the STA can tune to the AP and receive the AP's beacon without dwelling on the AP for an extended period of time.
Description
Technical field
The present invention relates to WLAN (wireless local area network) (WLAN), relate in particular to a kind of by the method for platform (STA) the accelerating discovery access point (AP) in drive sweep pattern.
Background technology
In the WLAN (wireless local area network) based on AP, STA communicates by letter with near the specific AP being positioned at described STA; Described STA is just called AP association therewith.Sometimes STA can need or want to change the AP associated with it.For instance, the region (that is roaming) that the extensible script of the described STA AP associated with it contained, and can be in the signal condition of quite bad.Another situation that can occur is to be caused poor throughput by the congested of appearance in the Basic Service Set of being served by original AP (BSS).
In order to make STA again associated with new AP, first this STA must find the AP that may exist in its adjacent domain.Drive sweep pattern for a kind of method of carrying out this search.In drive sweep, described STA monitors the beacon packet being sent by contiguous AP, and described beacon packet typically about every 100ms sends once.Described STA monitors on each transmission channel, and changes channel with set interval.Once described STA has listened to beacon and decoding is included in information in this beacon, this STA just can initiate for be close to AP associated process again.
Drive sweep pattern has weak point, because the enterprising line operate of channel that contiguous AP may be different.Therefore, in order to monitor described beacon, STA must be tuned to currently just operate the different channel of channel thereon by its associated AP from it.Because described STA does not know the time from the beacon transmissions of other AP conventionally, therefore this STA may need to reside in the time relatively long on each channel (>100ms), to guarantee that it has received the beacon from all contiguous AP.In the time that STA just monitors on other channels, described STA cannot receive the grouping from its associated AP, and therefore its communication just interrupt, and this interruption meeting adversely and significantly affects the quality by the service of user institute perception.
Summary of the invention
For in the method for WLAN (wireless local area network) accelerating discovery access point (AP) from being transmitted bulletin grouping via at least one channel by AP, described at least one channel is different from described AP and transmits the channel of beacon signal thereon.Described bulletin grouping is received by platform (STA), and this STA then determines whether to be associated with this transmission AP.Described bulletin grouping can comprise related information again, so that described STA can this information based in described bulletin grouping be associated with described AP, or can comprise time sequence information, so that described STA can tune to described AP and receives the beacon of described AP, and does not need to rest on the mono-elongated segment time of described AP.
Comprising in the WLAN (wireless local area network) of AP and at least one STA, wherein said AP has reflector and receiver, and wherein said at least one STA has receiver and reflector, be included in bulletin grouping and the determining device at each STA place in order to the system of accelerating discovery AP.The grouping of described bulletin is transmitted at least one channel by AP, and described at least one channel is the channel that is different from described AP and transmits beacon signal thereon, and the grouping of described bulletin is received by least one STA.Described determining device divides into groups to determine whether STA is associated to and transmits AP in order to the bulletin based on receiving.
In WLAN, the system of accelerating discovery AP comprises AP and STA.Described AP comprises bulletin grouping determining device; Bulletin packet transfer device, it is connected to described bulletin grouping determining device; The first emitter/receiver, it is connected to described bulletin packet transfer device; And first antenna, it is connected to described the first emitter/receiver.Described STA comprises the second antenna; The second emitter/receiver, it is connected to described the second antenna; Bulletin packet receiver unit, it is connected to described the second emitter/receiver; And channel tuner device, it is connected to described bulletin packet receiver unit and described the second emitter/receiver.
Accompanying drawing explanation
By the description of preferred embodiment hereinafter, the example giving, with reference to corresponding graphic, the present invention can obtain in more detail and understand, wherein:
Fig. 1 is the flow chart for the method for AP discovery;
Fig. 2 is the schematic diagram showing according to the transmission of the bulletin grouping of the method shown in Fig. 1; And
Fig. 3 is the schematic diagram that is configured for the system that transmits and receive bulletin grouping.
Embodiment
Hereinafter, term " platform (STA) " is including but not limited to the device of wireless transmitter/receiver unit, subscriber equipment, fixing or moving user unit, pager or any other form that can operate under wireless environment.In the time hereinafter mentioning, term " access point (AP) " is including but not limited to the interface arrangement of any other form in base station, Node B, controller of platform or wireless environment.
The present invention addresses the above problem with following method.AP can be under given conditions, transmits extra grouping (being called " bulletin grouping ") in one or more being different from its current frequency channels just operating thereon.This function allows STA to operate on these different channels to learn existing of AP, and does not need tuning their receiver to other channels, avoids by this communication disruption.
According to of the present invention for the method 100 of finding AP at WLAN as shown in Figure 1.Described method 100 is from determining whether described AP meets for transmitting (step 102) bulletin grouping pre-conditioned.Only in the situation that meeting specified conditions, AP just can determine to announce self on other channels.These conditions comprise, for example:
1) enough low loading condition in the BSS being served by described AP, makes described AP be tunable to other frequency channels and transmits its bulletin grouping, and do not need excessive interruption.If AP cannot hold new STA, just described AP does not need to announce self.During transmitting described bulletin grouping, described AP can be for example by sending " request sends (Request to Send; RTS) " or " removing to send (Clear to Send, CTS) grouping " to itself or call uncontended periods and avoid making its associated STA to its transmission information.
2) indication (via signaling between AP) from contiguous AP receiving, it indicates that in their BSS, to exist congestedly, and the business of need to sharing is to other channels.
3) by being periodically tuned to the one short period of other channels and monitoring the business on each channel, but described AP self discovery exists congested in other channels.
4) whether AP " knows " in the services set (ESS) of expansion has the STA of requirement fast roaming to exist (for instance, for example, if described STA uses the application of delay-sensitive, voice).Described AP can learn this information via signaling between AP.If there are multiple delay-sensitive STA, this can encourage AP to send bulletin grouping.
It will be appreciated by those skilled in the art that above-mentioned condition is only exemplary, and those skilled in the art it is contemplated that required other satisfied conditions of AP before sending bulletin grouping.
If AP does not meet a condition of the condition for transmitting bulletin grouping, described method 100 stops (step 104).If AP meets a condition of the condition for transmitting bulletin grouping, described AP transmits bulletin grouping (step 106).Bulletin grouping comprises following message:
1) frequency channels that described AP can be found; And
2) following both one of:
A) STA initiates to be associated to the required all information (for example, the address of described AP, AP ability etc.) of the association process again of described AP, is included in a part of information in described beacon, or whole beacon; Or
B) described AP transmits the timing information of described beacon packet in its channel of operation, and it is with respect to the transmission time of described bulletin grouping.
Described STA receives the content (step 108) that described bulletin divides into groups and determines described bulletin grouping.If described grouping comprises related information again, if described STA wants association again, it is tunable to the association process again (step 110) that described AP is just operating channel thereon and initiating immediately extremely new AP.Described method 100 then stops (step 104).
If grouping comprises timing information (step 108), if described STA wants again associated, it can be tuned to AP and just operate channel (step 112) thereon before the beacon transmissions time of AP, and monitor described beacon, therefore can avoid on described new channel resident (step 114) for a long time.Described STA then determines whether to be again associated to described new AP (step 116) individually, and described method becomes termination (step 104).
Fig. 2 illustrates the example of the transmitted in packets with three AP (AP1, AP2 and AP3) that operate in respectively on three channels (A, B and C).In this example, AP1 (it is underloaded) transmits bulletin grouping on channel B and C.
During each beacon period, AP typically transmits a no more than bulletin grouping of each channel.Within this cycle, the transmit timing of described bulletin grouping can be selected at random.Or, the specific time deviation of described AP lockable, this time deviation is with respect to the transmission of the beacon of this AP self.Before described bulletin is grouped in any other channel, AP should be similar to arbitrarily other STA observe like that general medium access rules (that is, became the free time on medium selected channel before transmitting after, wait for a special time amount).
Method 100 of the present invention provides following advantages:
1) reduce and utilize the STA flower of drive sweep pattern in the time of monitoring other frequency channels.Method 100 also can reduce the interruption of the STA that uses active scan mode, because need to not send probe requests thereby on other channels.
2), compared with the replaceable method of beacon timing information that transmits contiguous AP with AP, method 100 does not need synchronous between AP.In addition, monitoring also guarantees to monitor the beacon of described AP from the STA of the bulletin grouping of contiguous AP.In interchangeable method, STA can be away from contiguous AP, and the beacon timing information of this vicinity AP is provided by AP services.If described contiguous AP will be applicable to be equal to or higher than the rate transmissioning data of its AP services, described STA also can easily assess according to the signal strength signal intensity of described bulletin grouping.
3) method 100 can be used as the effective mechanism for the load balancing between AP.Described STA, find other AP available and that can conduct interviews to it on other channels before, does not make roaming and determines, so more easily associated and more effectively equally loaded again of described STA.In the situation that adopting centralized architecture, which AP access controller can manage based on load information will send bulletin grouping.
Fig. 3 is the schematic diagram that is configured for the system 300 that transmits and receive bulletin grouping.Described system 300 comprises AP 302 and STA 304.Described AP 302 comprises bulletin grouping determining device 310, is connected to the bulletin packet transfer device 312 of described bulletin grouping determining device 310, be connected to the emitter/receiver 314 of described bulletin packet transfer device 312, and be connected to the antenna 316 of described emitter/receiver 314.Described STA 304 comprises antenna 320, is connected to the emitter/receiver 322 of described antenna 320, be connected to the bulletin packet receiver unit 324 of described emitter/receiver 322, and be connected to the channel tuner device 326 of described emitter/receiver 322 and described bulletin packet receiver unit 324.
Described bulletin grouping determining device 310 determines whether described system status is applicable to described AP 302 and sends out bulletin grouping.If determining, described bulletin grouping determining device 310 send out bulletin grouping, described bulletin grouping determining device 310 just sends a signal to described bulletin packet transfer device 312, and this bulletin packet transfer device 312 produces described bulletin grouping and dispatches its transmission.After described bulletin grouping, be sent to described emitter/receiver 314, and be broadcasted via antenna 316 at described emitter/receiver 314 places.
Described STA 304 receives bulletin grouping via antenna 320 and emitter/receiver 322.The grouping of described bulletin checked to determine the information comprising in described bulletin grouping by described bulletin packet receiver unit 324, and makes described STA 304 and whether will again be associated to determining of described AP 302.If described STA 304 will be associated to described AP 302 again, described bulletin packet receiver unit 324 just sends a signal to described channel tuner device 326 to by the extremely channel of described AP 302 of channel-changing, make described emitter/receiver 322 can receive the grouping from AP 302.
Embodiment
1. the method for an accelerating discovery access point (AP) in WLAN (wireless local area network), the method comprises the following steps: transmit bulletin grouping by AP via at least one channel, described at least one channel is the channel that is different from described AP and transmits beacon signal thereon; Receive described bulletin grouping by platform (STA); And determine whether described STA to be associated to and to transmit AP.
2. method as described in Example 1, wherein said transfer step comprises: determine whether to meet for transmitting the pre-conditioned of bulletin grouping; And if met described pre-conditionedly, transmit the grouping of described bulletin.
3. method as described in Example 2, wherein said pre-conditioned comprising: determine in the basic service of being served by described AP to concentrate whether there is low loading condition.
4. method as described in Example 2, wherein said pre-conditioned comprising: receive the indication from contiguous AP, it indicates that the basic service of described contiguous AP concentrate exist congested.
5. method as described in Example 2, wherein said pre-conditioned comprising: determine to exist congestedly on other channels, describedly congestedly determined by the business that is periodically tuned to other channels and monitor on other channels by described AP.
6. method as described in Example 2, wherein said pre-conditioned comprising: determine in the services set of expansion whether have delay-sensitive STA.
7. the method as described in previous arbitrary embodiment, wherein said bulletin grouping comprises related information again, and by this, described STA can be associated to described AP according to the described information in described bulletin grouping.
8. the method as described in previous arbitrary embodiment, wherein said bulletin grouping comprises timing information, and by this, described STA is tunable to described AP and receives the beacon of described AP, and does not need to rest on the time cycle of described AP mono-elongated segment.
9. a system for accelerating discovery access point (AP) in WLAN (wireless local area network), comprising: AP; At least one platform (STA); Bulletin grouping, it is transmitted at least one channel by described AP, and described at least one channel is the channel that is different from described AP and transmits beacon signal thereon, and the grouping of described bulletin is received by least one STA; And in the determining device at each STA place, divide into groups to determine whether that in order to the bulletin based on receiving associated STA is to described AP.
10. system as described in Example 9, wherein said bulletin grouping comprises related information again, by this, receives described information association that the described STA of described bulletin grouping can be based in described bulletin grouping to described AP.
11. systems as described in embodiment 9 or 10, wherein said bulletin grouping comprises timing information, and by this, described STA is tunable to described AP and receives the beacon of described AP, and does not need to rest on the time cycle of described AP mono-elongated segment.
12. as the system as described in arbitrary in embodiment 9-11, also comprises: in second determining device at described AP place, in order to before transmitting described bulletin grouping, determine whether to meet pre-conditioned.
13. as the system as described in arbitrary in embodiment 9-12, wherein said pre-conditioned comprising: determine in the basic service of being served by described AP to concentrate whether there is low loading condition.
14. as the system as described in arbitrary in embodiment 9-12, wherein said pre-conditioned comprising: receive the indication from contiguous AP, the basic service that it indicates that described contiguous AP concentrate exist congested.
15. as the system as described in arbitrary in embodiment 9-12, wherein said pre-conditioned comprising: determine on other channels, to exist congestedly, describedly congestedly determined by the business that is periodically tuned to other channels and monitor on other channels by described AP.
16. as the system as described in arbitrary in embodiment 9-12, wherein said pre-conditioned comprising: determine in the services set of expansion whether have delay-sensitive STA.
The system of 17. 1 kinds of accelerating discovery access points (AP) in WLAN (wireless local area network), described system comprises AP and platform.Described AP comprises bulletin grouping determining device; Bulletin packet transfer device, it is connected to described bulletin grouping determining device; The first emitter/receiver, it is connected to described bulletin packet transfer device; And first antenna, it is connected to described the first emitter/receiver.Described platform comprises the second antenna; The second emitter/receiver, it is connected to described the second antenna; Bulletin packet receiver unit, it is connected to described the second emitter/receiver; And channel tuner device, it is connected to described bulletin packet receiver unit and described the second emitter/receiver.
18. systems as described in embodiment 17, wherein said bulletin grouping determining device is configured to determine whether described AP should send bulletin grouping.
19. systems as described in embodiment 17 or 18, wherein said bulletin packet transfer device is configured to prepare and dispatch the bulletin grouping for transmitting.
20. systems as described in as arbitrary in embodiment 17-19, wherein said bulletin packet receiver unit is configured to receive the bulletin grouping from AP; Inspection is included in the information in described bulletin grouping; And determine whether described platform should be associated to the described AP that sends described bulletin grouping again.
21. systems as described in embodiment 20, if wherein described bulletin packet receiver unit is determined and is again associated to different AP, described channel tuner device is configured to the receive channel of described platform to make into the channel of described different AP.
Although feature of the present invention and element are all described in particular combinations mode in embodiment, but in embodiment, each feature or element can use alone, and do not need and other features or the elements combination of preferred implementation, or from/do not do different combinations with other features of the present invention and element.Although the present invention describes by preferred embodiment, other modification that do not deviate from claim of the present invention are apparent for a person skilled in the art.Above-mentioned description is for the purpose of description, and can not limit by any way special invention.
Claims (9)
1. carry out the method at wireless network accelerating discovery access point for announce grouping by transmission, comprising:
Determine whether to meet for transmitting the pre-conditioned of described bulletin grouping, wherein:
Describedly pre-conditionedly comprise that the basic service of being served by access point concentrates determining of low loading condition; And
Described bulletin grouping comprises: the frequency channels of described access point; And one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point; And
Meeting describedly pre-conditioned in the situation that, transmitting and on the different channel of the channel of beacon signal, transmitting described bulletin and divide into groups from described access point by described access point.
2. carry out the method at wireless network accelerating discovery access point for announce grouping by transmission, comprising:
Determine whether to meet for transmitting the pre-conditioned of described bulletin grouping, wherein:
Describedly pre-conditionedly comprise that showing of receiving from contiguous access point concentrate and have congested indication in the basic service of described contiguous access point; And
Described bulletin grouping comprises: the frequency channels of described access point; And one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point; And
Meeting describedly pre-conditioned in the situation that, transmitting and on the different channel of the channel of beacon signal, transmitting described bulletin and divide into groups from described access point by described access point.
3. carry out the method at wireless network accelerating discovery access point for announce grouping by transmission, comprising:
Determine whether to meet and transmit the pre-conditioned of described bulletin grouping, wherein:
On described pre-conditioned other channel being included in except the channel of the current use of described access point, exist and congested determine, describedly congestedly determined by the business that is periodically tuned to described other channel and monitor on described other channel by described access point; And
Described bulletin grouping comprises: the frequency channels of described access point; And one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point; And
Meet described pre-conditioned in the situation that, by the bulletin grouping described in transmit the different channel of the channel of beacon signal from described access point of described access point.
4. carry out the method at wireless network accelerating discovery access point for announce grouping by transmission, comprising: determine whether to meet for transmitting the pre-conditioned of described bulletin grouping, wherein:
Described pre-conditioned be included in expansion service concentrate have delay-sensitive platform determine; And
Described bulletin grouping comprises: the frequency channels of described access point; And one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point; And
Meeting describedly pre-conditioned in the situation that, transmitting and on the different channel of the channel of beacon signal, transmitting described bulletin and divide into groups from described access point by described access point.
5. an access point, comprising:
Reflector, be configured for and transmitting on the different channel of the channel of beacon signal and transmitting bulletin grouping from described access point, wherein said bulletin grouping comprises: the frequency channels of described access point and one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point;
Processor, is configured for and before transmitting the grouping of described bulletin, determines whether to meet pre-conditioned, wherein saidly pre-conditionedly comprises that the basic service of being served by described access point concentrates determining of low loading condition; And
Described reflector is also configured to meeting the described described bulletin grouping that transmits pre-conditioned in the situation that.
6. an access point, comprises;
Reflector, be configured for and transmitting on the different channel of the channel of beacon signal and transmitting bulletin grouping from described access point, wherein said bulletin grouping comprises: the frequency channels of described access point and one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point;
Receiver;
Processor, be configured for before transmitting the grouping of described bulletin, determine whether to meet pre-conditioned, the wherein said pre-conditioned indication receiving from contiguous access point that comprises, described indication show the basic service of described contiguous access point concentrate exist congested; And
Described reflector is also configured to meeting the described described bulletin grouping that transmits pre-conditioned in the situation that.
7. an access point, comprising:
Reflector, be configured for and transmitting on the different channel of the channel of beacon signal and transmitting bulletin grouping from described access point, wherein said bulletin grouping comprises: the frequency channels of described access point and one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point;
Receiver;
Processor, be configured for before transmitting the grouping of described bulletin, determine whether to meet pre-conditioned, on wherein said pre-conditioned other channel being included in except the presently used channel of described access point, exist and congested determine, describedly congestedly determined by the business that is periodically tuned to described other channel and monitor on described other channel by described access point; And
Described reflector is also configured to meeting the described described bulletin grouping that transmits pre-conditioned in the situation that.
8. an access point, comprising:
Reflector, be configured for and transmitting on the different channel of the channel of beacon signal and transmitting bulletin grouping from described access point, wherein said bulletin grouping comprises: the frequency channels of described access point and one of the following: platform is associated to the timing information of the beacon packet transmission of the required information of described access point or described access point;
Receiver;
Processor, is configured for and before transmitting the grouping of described bulletin, determines whether to meet pre-conditioned, and the wherein said pre-conditioned expansion service that is included in is concentrated and had determining of delay-sensitive platform; And
Described reflector is also configured to meeting the described described bulletin grouping that transmits pre-conditioned in the situation that.
9. a platform, comprising:
Receiver, is configured for via the channel different from the channel of access point transmission beacon signal and receives the bulletin grouping from described access point, and described bulletin grouping comprises the timing information of the beacon packet transmission of described access point; And
Processor, the described bulletin being configured for based on receiving divides into groups to determine whether described platform is associated to described access point.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60876604P | 2004-09-10 | 2004-09-10 | |
| US60/608,766 | 2004-09-10 | ||
| US11/018,184 | 2004-12-21 | ||
| US11/018,184 US7440418B2 (en) | 2004-09-10 | 2004-12-21 | Accelerating discovery of access points in a wireless local area network |
| PCT/US2005/031633 WO2006031493A2 (en) | 2004-09-10 | 2005-09-07 | Accelerating discovery of access points in a wireless local area network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101019378A CN101019378A (en) | 2007-08-15 |
| CN101019378B true CN101019378B (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200580030245.8A Expired - Fee Related CN101019378B (en) | 2004-09-10 | 2005-09-07 | Accelerating discovery of access points in a wireless local area network |
| CN 200520107252 Expired - Fee Related CN2877155Y (en) | 2004-09-10 | 2005-09-12 | System for accelerating discovery of access points in wireless local area network |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520107252 Expired - Fee Related CN2877155Y (en) | 2004-09-10 | 2005-09-12 | System for accelerating discovery of access points in wireless local area network |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204221A (en) * | 1997-06-30 | 1999-01-06 | 三星电子株式会社 | Hard handoff method using the dummy pilot |
| CN1479466A (en) * | 2002-08-29 | 2004-03-03 | 深圳市中兴通讯股份有限公司 | Aggregating method of group data service between nodal joints |
| CN1505339A (en) * | 2002-12-02 | 2004-06-16 | ���ǵ�����ʽ���� | Apparatus for controlling load balance of multi-access points in a wireless lan system and method thereof |
-
2005
- 2005-09-07 CN CN200580030245.8A patent/CN101019378B/en not_active Expired - Fee Related
- 2005-09-12 CN CN 200520107252 patent/CN2877155Y/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204221A (en) * | 1997-06-30 | 1999-01-06 | 三星电子株式会社 | Hard handoff method using the dummy pilot |
| CN1479466A (en) * | 2002-08-29 | 2004-03-03 | 深圳市中兴通讯股份有限公司 | Aggregating method of group data service between nodal joints |
| CN1505339A (en) * | 2002-12-02 | 2004-06-16 | ���ǵ�����ʽ���� | Apparatus for controlling load balance of multi-access points in a wireless lan system and method thereof |
Non-Patent Citations (1)
| Title |
|---|
| CN 1204221 A,说明书第5-6页、附图1. |
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| CN2877155Y (en) | 2007-03-07 |
| CN101019378A (en) | 2007-08-15 |
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