CN102186216B - Method for increasing roaming speed of station in wireless network - Google Patents
Method for increasing roaming speed of station in wireless network Download PDFInfo
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- CN102186216B CN102186216B CN201110118789.7A CN201110118789A CN102186216B CN 102186216 B CN102186216 B CN 102186216B CN 201110118789 A CN201110118789 A CN 201110118789A CN 102186216 B CN102186216 B CN 102186216B
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Abstract
The invention provides a method for increasing roaming speed of a station in a wireless network. The wireless network comprises a station, a wireless access controller and a plurality of access points. The method is characterized by comprising the following steps that: the station sends an access request; the wireless access controller determines which access point responds, confirms and provides service for the station based on a basic service set identification (BSSID) distributed to the station, a mask and bit mapping of each access point in the plurality of access points; and if the wireless access controller determines that the access point responsible for the station needs to switch another access point in the plurality of access points, the wireless access controller resets the mask of the access point responsible for the station, and modifies the mask of the another access point responsible for the station.
Description
Technical field
The present invention relates to wireless network communication technique, more specifically, relate to a kind of method that promotes website (STA) roam speed in wireless network.
Background technology
Along with the application of WLAN (wireless local area network) (WLAN) is more and more wider, this technology more and more welcomed by the people.At first, the 802.11b scheme of IEEE 802.11 working groups design is operated in 2.4Ghz, and connection speed is 2Mbps.Along with the design of IEEE 802.11 working groups is constantly upgraded, 802.11a scheme is operated in 5Ghz, and connection speed is up to 54Mbps; The connection speed of 802.11g scheme or 54Mbps, and its design frequency is operated in 2.4Ghz, compatible 802.11b; The 802.11n of up-to-date release both can be operated in 2.4Ghz, also can be operated in 5Ghz, and by using multiple-input and multiple-output (MIMO) technology to make the speed can be up to 600Mpbs.IEEE 802.11 working groups are still continuing the higher traffic rate of design.WLAN technology also becomes a kind of in Long Term Evolution (LTE) technology, forms competitive complement relation with the technology such as worldwide interoperability for microwave access (WiMAX), Wideband Code Division Multiple Access (WCDMA) (WCDMA), code division multiple access (CDMA).
Aspect WLAN deployment, from the WAP (wireless access point) (AP) of original single autonomy, evolve to by Radio Access Controller (AC) and the common centralized control system (thin AP architecture) forming of AP, this evolution is more manageable than the AP of single autonomy, the frequency of can making overall planning, signal covers, realize the Premium Features such as roaming, be therefore more and more subject to the welcome of operator, medium-sized large organization (enterprise, school, hospital, government department, retail shop etc.).
Typical WLAN disposes as shown in Figure 1.At existing WLAN, dispose in framework, AP is by connecting PoE switch access AC, and AC is unified controls AP, and the various aspects of AP are managed.In wireless environment, the most complicated is exactly the management to radiofrequency signal, often needs frequency to carry out unified planning, tries one's best and realizes signal covering and avoid reaching balance between signal interference.
Shown in Fig. 2 is the relation of the characteristic of radio transmission and the connection speed of WLAN.At the emission source of electric wave, connection speed is the highest, then reduces gradually, is finally reduced to user and does not connect network, can not carry out data communication, farther but the energy of radio wave can transmit.
In the WLAN structure of concentrate disposing, in order to solve signal, cover and the relation avoiding interference, the cellular deployment mode of having used for reference GSM realize avoid covering black hole and avoid interference between contradiction.
The frequency range of 802.11 schemes shown in Fig. 3 is divided schematic diagram.As shown in Figure 3, in the 2.4Ghz of WLAN frequency range, mark off three non-interfering frequency ranges, then by these three non-interfering frequency ranges, form the system of similar honeycomb.The spectrum cellular schematic diagram being formed by non-interfering frequency range shown in Fig. 4.
Although large scale deployment of the WLAN of prior art scheme, meets people's communication requirement substantially, can get online without being tethered to a cable whenever and wherever possible, realizes large-scale wireless coverage.But also there are some problems.
Although be first that signal is all standing, due to the propagation characteristic of radio magnetic wave, the local speed near in distance signal source is high, connects; The local signal difference far away in distance signal source, connects badly, and speed of surfing the Internet is slow.More awkward, if user at the edge of honeycomb, it is uncontrollable that situation will become.
Radio wave may run into interference, reflection, and refraction etc., desirable cellular model may be inapplicable, be easy to part and cause interference, or covering black hole caused in part.
When high speed 802.11n, each channel occupancy 40Mhz, like this at 2.4Ghz, just can not isolate glitch-free three frequency ranges mutually.Easily cause 802.11n rollback to become b/g pattern, user can not carry out the Perfect Experience of high speed access network.
When user roams, because needs frequency range is switched, need STA again associated, be easy to cause packet loss, time delays etc., cause the service disconnection for time-sensitive, or poor user experience.
Summary of the invention
In order to solve in prior art, to disturb, cover the problems such as black hole, switching, the invention provides a kind of in wireless network the method for promoting station roaming speed, this wireless network comprises website, Radio Access Controller and a plurality of access point, and described method comprises: website sends access request; Which access point Radio Access Controller is determined by and is replied confirmation and service is provided to website based on distributing to the mask of each access point in the BSSID of website, a plurality of access point and position mapping; If Radio Access Controller is determined the access point of being responsible for described website and need to be switched another access point in described a plurality of access point, Radio Access Controller resets the current mask of being responsible for the access point of described website, and revises the mask of another access point that will be responsible for described website.
According to a further aspect in the invention, Radio Access Controller will be distributed to the BSSID of website and the mask of each access point in described a plurality of access point carries out and operation respectively, by each access point in described a plurality of access points, compare with the position mapping of this access point respectively with result operation, if the result with operating of an access point in described a plurality of access point equals the position mapping of this access point, determine by this access point and reply confirmation and service is provided to website.
According to a further aspect in the invention, after website sends the step of access request, described method also can also comprise step: described a plurality of access points by the information reporting of website to Radio Access Controller.
According to a further aspect in the invention, the information of the website reporting can comprise a field, message field and CRC field, and message field comprises MAC Address and the received signal strength indicator of website.
According to a further aspect in the invention, Radio Access Controller determines whether to switch based on received signal strength indicator.
According to a further aspect in the invention, can expand by locking the mode of the certain bits of BSSID the capacity of wireless network.
According to exemplary embodiment of the present invention, adopted channel soverlay technique, and avoid interference by special arbitration mechanism, thereby thoroughly solved the covering black hole of wireless coverage and the contradiction of signal phase mutual interference, the wireless channel availability greatly improving, solution is emitted other unnecessary channel simultaneously, save valuable channel resource, or use unnecessary channel resource to carry out intensive covering, be specially adapted to the convention hall that the crowd is dense, the application of the intensive covering in stadium etc.
Accompanying drawing explanation
By the detailed description to embodiment below in conjunction with accompanying drawing, above-mentioned and/or other aspects of the present invention will become clear and be easier to understand, wherein:
Fig. 1 is the schematic diagram that the layout of WLAN (wireless local area network) in prior art (WLAN) is shown;
Fig. 2 is the schematic diagram that the relation of the characteristic of radio transmission and the connection speed of WLAN is shown;
Fig. 3 is that the frequency range that 802.11 schemes are shown is divided schematic diagram;
The spectrum cellular schematic diagram being formed by non-interfering frequency range shown in Fig. 4;
Fig. 5 is the schematic diagram that a plurality of according to an embodiment of the invention STA roam in WLAN (wireless local area network);
Fig. 6 is the data format figure that shows the STA information that reports AC;
Fig. 7 is the schematic diagram that two STA roam in two adjacent AP;
Fig. 8 is the schematic diagram that a STA roams into the interference range of two adjacent AP.
Embodiment
The present invention will be described in detail with reference to the accompanying drawings, should be understood that described here is only the preferred embodiments of the present invention.Those skilled in the art can as required, carry out adaptive modification to the present invention.
The invention provides a kind of in wireless network the method for promoting station roaming speed, this wireless network comprises website, Radio Access Controller and a plurality of access point, described method comprises: website sends access request; Which access point Radio Access Controller is determined by and is replied confirmation and service is provided to website based on distributing to the mask of each access point in the BSSID of website, a plurality of access point and position mapping; If Radio Access Controller is determined the access point of being responsible for described website and need to be switched another access point in described a plurality of access point, Radio Access Controller resets the current mask of being responsible for the access point of described website, and revises the mask of another access point that will be responsible for described website.
According to a further aspect in the invention, Radio Access Controller will be distributed to the BSSID of website and the mask of each access point in described a plurality of access point carries out and operation respectively, by each access point in described a plurality of access points, compare with the position mapping of this access point respectively with result operation, if the result with operating of an access point in described a plurality of access point equals the position mapping of this access point, determine by this access point and reply confirmation and service is provided to website.
Below with reference to accompanying drawings to of the present invention in wireless network the method for promoting station roaming speed be described in detail.
Fig. 5 is the schematic diagram that a plurality of according to an embodiment of the invention STA roam in WLAN (wireless local area network).
In this WLAN (wireless local area network), each access point (AP) that connects Radio Access Controller (AC) is used identical channel, and uses high-power ensuring coverage scope, thoroughly avoids covering black hole.Like this according to electromagnetic principle, the edge covering at a plurality of AP signals, certainly the signal overlap that has two AP, like this during STA transmitted signal, two AP can return confirmation (ACK), be easy to like this cause the signal of two AP of STA all to can't hear, this is called as " interference " of the present invention problem.For fear of this " interference " problem, according to exemplary embodiment of the present invention, the ACK back and forth by which AP is determined in the mask of the BSSID (BSSID) of AC based on STA, AP and position mapping, to guarantee an only having AP to return ACK, guaranteed like this to only have an AP transmitted signal, STA just can communicate by letter with AP, does not also produce interference.In addition, when STA transmitted signal, (two or more AP, for example, AP1) can receive signal to a plurality of AP, the signal strength signal intensity of each AP measurement STA (, received signal strength indicator (RSSI)), then report AC, AC determines whether to switch according to this signal strength signal intensity, if need to switch, by changing the mask of AP, carry out handover operation.With reference to Fig. 7 and Fig. 8, be described in detail after a while.
As shown in Figure 5, AP11, AP12, AP13, AP14 are connected with AC, and AC is connected with the Internet, guarantee AP can with internet communication.STA21, STA22, STA23 are dispersed in network, and all AP are operated in identical channel, and the ratio comparatively dense of disposing, ensuring coverage scope.Take AP11, AP12, STA21, STA22 is below described as example.
For example, if STA21 wants communication, send the request of seeking (Probe Request).AP11, AP12 can hear like this, and AP11, AP12 receive after the request of seeking, the information reporting of STA21 to AC.Or, if STA21 wants communication, first (for example monitor AP, AP11, AP12) beacon frame (Beacon) message that sends, extract BSSID, then send associated request (Assoc Request), AP11, AP12 can hear like this, after AP11, AP12 receive associated request, by the information reporting of STA21 to AC.The concrete data format of the information of STA21 as shown in Figure 6.
The data format of the information that as shown in Figure 6, AP reports comprises head (Head) field, message (Message) field and CRC (CRC) field.Field is used for illustrating how this information is transferred to AC, such as a field, can comprise the transmission address of this information and destination address etc.Message field mainly comprises MAC Address, RSSI and other the necessary relevant information of STA.Should guarantee that relevant information is as much as possible little of to avoid transmission waste under the prerequisite meeting the demands, because the transmission for reporting information limits if having time, if do not have AP to return ACK in official hour, STA thinks and will resend the request of seeking by the dropout sending.This situation will do one's utmost to avoid, because wasted like this communication bandwidth, causes inefficiency.CRC check is for guaranteeing the correctness of transfer of data.
AC processes after receiving the information that AP11 and AP21 report.If the first reporting information of AP11, AC notice AP11 returns ACK to STA21, and the information of the follow-up AP12 receiving of AC is left in the basket; If the first reporting information of AP12, AC notice AP12 returns ACK to STA21, and the information of the follow-up AP11 receiving of AC is left in the basket; If AP11, AP12 be reporting information simultaneously, the ACK back and forth by which AP is determined in the mask of BSSID, the AP of AC based on STA and position mapping, that is, by which AP, communicated by letter with STA21.
Below with reference to Fig. 7, describe how mask and the position mapping of BSSID, the AP based on STA in detail and determine which AP to return ACK to STA by.
With reference to Fig. 7, two AP (AP11 and AP12) are used identical BSSID, and in adjacent area, there is interference range centre.At first, the position mapping (bitmap) of AP11 and AP12 is identical with mask (Mask).Specifically, the position mapping of AP11 and AP12 is 00:1F:64:0000:0000:0000:0000:0000:0000, and mask is 00:1F:64:1111:1111:1111:1111:1111:1111.Here it should be noted that, BSSID in the application, position mapping and mask are all 48, for the ease of statement, front 24 with hexadecimal representation, rear 24 with binary representation, for example, front 24 " 00:1F:64 " in upper rheme mapping are hexadecimal data, and rear 24 " 0000:0000:0000:0000:0000:0000 " are binary data.
The network that STA21 access AP11 covers, AP11 distributes to unique BSSID:00:1F:64:0000:0000:0000:0000:0000:0001 of STA21, and the mask of corresponding AP11 becomes: 00:1F:64:1111:1111:1111:1111:1111:1110.
The network that STA22 access AP12 covers, AP12 distributes to unique BSSID:00:1F:64:0000:0000:0000:0000:0001:0000 of STA22, and the mask of corresponding AP12 becomes: 00:1F:64:1111:1111:1111:1111:1110:1111.
Now, STA21 communicates by letter with AP11, and STA22 communicates by letter with AP12, communicates by letter smooth and easy, does not disturb.But when STA21 moves to interference range (with reference to Fig. 8), AP11 and AP12 can listen to STA21, which AP is problem be now how to confirm by STA21 ACK back and forth.According to exemplary embodiment of the present invention, AC carries out following operation: by the mask of the BSSID of STA21 and AP11 carry out with operation (referred to as: STA21 & Mask (AP11)), will with operation after result shine upon and compare with the position of AP11; By the mask of the BSSID of STA21 and AP12 carry out with operation (referred to as: STA21 & Mask (AP12)), will with operation after the position of result and AP12 shine upon and compare; If the result of STA21 & Mask (AP11) equals the position mapping of AP11, determine and to STA21, return ACK by AP11; If the result of STA21 & Mask (AP12) equals the position mapping of AP12, determine and to STA21, return ACK by AP12.Can analyze specifically which in AP11 and AP12 by expression formula below and return ACK to STA21.
STA21&Mask(AP11)＝00:1F:64:0000:0000:0000:0000:0000:0000＝＝bitmap(AP11)
STA21&Mask(AP12)＝00:1F:64:0000:0000:0000:0000:0000:0001！＝bitmap(AP12)
From expression formula above, the position mapping because STA21 & Mask (AP11) equals AP11, therefore, determines and to STA21, return ACK by AP11, thereby STA21 is also safe at interference range, can not produce interference.
According to another exemplary embodiment of the present invention, AP12 receives that the message of STA21 also can report AC, and the channel strength in the information that AC reports according to AP (that is, received signal strength indicator (RSSI)) determines whether to switch.If AC decision-making STA21 need to be switched to AP12 service, AC can carry out handover operation by revising the mask of AP11 and AP12.Specifically, owing to determining that not needing AP11 is STA21 service, the mask of AP11 resets, and the mask of AP11 becomes: 00:1F:64:1111:1111:1111:1111:1111:1111.Owing to determining, by AP12, be that STA21 serves, the mask of AP12 be revised as to 00:1F:64:1111:1111:1111:1111:1110:1110.Now, which AP we are determined by and are returned ACK to STA21 by expression formula below.
STA21&Mask(AP11)＝00:1F:64:0000:0000:0000:0000:0000:0001！＝bitmap(AP11)
STA21&Mask(AP12)＝00:1F:64:0000:0000:0000:0000:0000:0001＝＝bitmap(AP12)
Therefore, by AP12, returned the ACK of STA21, thereby complete smoothly soft handover.
By technical scheme of the present invention, can avoid a plurality of AP to reply ACK simultaneously, and realize seamless soft handover.According to another exemplary embodiment of the present invention, the certain bits that can lock in the following way the BSSID of each STA of dispensing is carried out extended network capacity: because BSSID address is generally 48, can be by front 2 reservations of BSSID, immediately following 2, as roaming territory, distribute to STA as unique ID for remaining 44.If roaming territory takies 2, always have 2
2=4 roaming territories, each roaming territory can hold the STA of 44 (48-2-2=44) individual uniqueness, and such AP just can support 4 * 44=176 STA.In addition, if roaming territory takies 3, can support (2
3* (48-2-3))=344 STA.That is to say, can lock according to demand the certain bits of BSSID for expanding the capacity of wireless network.
In addition, if after defining BSSID, the STA newly increasing in addition wants to communicate by letter with this AP, can distribute identical ID to the STA newly increasing, and the worst situation is two and is assigned with identical STA and communicates by letter simultaneously and cause and disturb and retransmit.In addition,, if also have more STA to want to access this AP, can increase more unique ID for distributing to STA by locking again one or several positions.
Therefore, can expand by locking the mode of the certain bits of BSSID the capacity of wireless network.
Two AP of take are above described as example, and plural AP similarly, is no longer repeated in this description at this.Although in addition, it should be understood that the present invention usings WLAN (wireless local area network) and describe as example, the invention is not restricted to this.Technical scheme of the present invention can be applicable to have the network of multi-speed wireless arbitrarily with the similar framework of WLAN (wireless local area network), for example, and Long Term Evolution (LTE) system, global intercommunication microwave access (WiMAX) system etc.
The various shortcoming covering in order to solve honeycomb, the present invention has adopted channel soverlay technique, and avoid interference by special arbitration mechanism, thereby thoroughly solved the covering black hole of wireless coverage and the contradiction of signal phase mutual interference, the wireless channel availability greatly improving, solution is emitted other unnecessary channel simultaneously, save valuable channel resource, or use unnecessary channel resource to carry out intensive covering, be specially adapted to the convention hall that the crowd is dense, the application of the intensive covering in stadium etc.
Although specifically shown with reference to its exemplary embodiment and described the present invention, but it should be appreciated by those skilled in the art, in the situation that do not depart from the spirit and scope of the present invention that are defined by the claims, can carry out the various changes in form and details to it.
Claims (5)
1. a method for promoting station roaming speed in wireless network, this wireless network comprises website, Radio Access Controller and a plurality of access point, it is characterized in that, described method comprises:
Website sends access request;
Which access point Radio Access Controller is determined by and is replied confirmation and service is provided to website based on distributing to the mask of each access point in the BSSID of website, a plurality of access point and position mapping, it is hexadecimal data that position mapping is first 24, rear 24 48 bit data that are binary data;
If Radio Access Controller is determined the access point of being responsible for described website and need to be switched another access point in described a plurality of access point, Radio Access Controller resets the current mask of being responsible for the access point of described website, and modification will be responsible for the mask of another access point of described website
Wherein, Radio Access Controller will be distributed to the BSSID of website and the mask of each access point in described a plurality of access point carries out and operation respectively, by each access point in described a plurality of access points, compare with the position mapping of this access point respectively with result operation, if the result with operating of an access point in described a plurality of access point equals the position mapping of this access point, determine by this access point and reply confirmation and service is provided to website.
2. the method for claim 1, is characterized in that, after website sends the step of access request, described method also comprises step: described a plurality of access points by the information reporting of website to Radio Access Controller.
3. the method for claim 1, is characterized in that, the information of the website reporting comprises a field, message field and CRC field, and message field comprises MAC Address and the received signal strength indicator of website.
4. method as claimed in claim 3, is characterized in that, Radio Access Controller determines whether to switch based on received signal strength indicator.
5. the method as described in any one in claim 1 to 4, is characterized in that, the mode of the certain bits by locking BSSID expands the capacity of wireless network.
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