CN100461728C - Radio communication method - Google Patents
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- CN100461728C CN100461728C CNB2005100066048A CN200510006604A CN100461728C CN 100461728 C CN100461728 C CN 100461728C CN B2005100066048 A CNB2005100066048 A CN B2005100066048A CN 200510006604 A CN200510006604 A CN 200510006604A CN 100461728 C CN100461728 C CN 100461728C
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Abstract
Present invention provides a wireless communication method between at least two wireless access points, which contains first wireless access point access point (AP) transmitting polling request frame to second wireless access point which responding the request and transmitting polling response frame to first wireless access point, first wireless access point transmitting access request frame to second wireless access point access point which responding the request and transmitting access response frame to first wireless access point, establishing wireless communication wireless communication connection and data exchange between first wireless access point and second wireless access point. Present invention provides scheme of authenticate, connection, data communication and data ciphering of communication between AP in ESS to make reliable and effective communication.
Description
Technical field
The present invention relates to wireless communications method, relates in particular to be used for carrying out method of wireless communication between at least two WAP (wireless access point).
Background technology
In recent years, continuous progress along with wireless communication technology, WLAN (wireless local area network) (WirelessLocal Area Network, be abbreviated as WLAN), this solution of utilizing wireless technology to transmit data, speech and vision signal aloft is as a kind of replacement scheme or the extension of traditional wiring network.The employing WLAN (wireless local area network) can make the user that cable network is expanded arbitrarily 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.But, theoretically, but the limit decision of physical layer the distance of direct communication between the website.To some network, such distance is enough; But for other network, but need to increase coverage.
Basic Service Set (Basic Service Set is abbreviated as BSS) can also become a part that comprises the extended network of a plurality of BSS except can independently existing.The part that is used to connect different B SS is exactly so-called distributed system (Distribution System is abbreviated as DS).
(wireless) access point (Access Point is abbreviated as AP) can also be provided to the access of DS by the DS service is provided except the effect that can play website.Transfer of data between DS and the BSS is finished by AP.Utilize DS and BSS, can create the wireless network of any size and complexity.Institute of Electrical and Electric Engineers (Institute ofElectrical and Electronics Engineers, be abbreviated as IEEE) 802.11 series standards this network type is called extended service set (Extended Service Set is abbreviated as ESS).
For two cable LANs, can they be linked together by two AP, realize passing through between two cable LANs the interconnection and the resource-sharing of wireless mode, also can realize the expansion of cable network simultaneously.In ESS, AP both can be used as bridge and also can be used as repeater operation.Use wireless medium (Wireless Medium, be abbreviated as WM) as distributed system media (Distribution System Medium, be abbreviated as DSM) DS we be referred to as wireless distribution system (Wireless Distribution System is abbreviated as WDS).
WDS has changed original single, simple wireless application pattern.Such as, when large-scale hot spot region and enterprise customer select the solution of wireless WDS technology for use, can connect each AP by various optional wireless application modes, so just improved the mobile type and the convenience of whole network configuration greatly.
Figure 10 shows ESS of the prior art.In the ESS shown in Figure 10, suppose that a data message will be sent to second website from first website (Station is abbreviated as STA).This data-message is at first sent by first website, receives (being input to AP) by second website then.AP gives this data-message the distribution services of DS.The task of distribution services is exactly in DS, pays this data-message according to a kind of like this method: make this data-message arrive suitable DS destination, so that predetermined acceptance side receives.In the example of Figure 10, this data-message is distributed to the 3rd website (output AP), and the 3rd website sends to the 4th website (predetermined recipient) by visit WM with this data-message then.
Distribution is the main service that IEEE 802.11b STA uses.In concept, when sending the data-message frame,, import this STA or all need to call distribution services from each data-message of this STA output for a STA who just in ESS, is moving by DS.Distribution realizes by distributed system service (Distribution System Service is abbreviated as DSS).
How IEEE 802.11 not regulation message is distributed in DS.The whole tasks that require IEEE802.11 to finish are exactly for DS provides enough information, so that make DS find corresponding message " output " point according to predetermined recipient, then through finding predetermined recipient by " output " point.Provide these necessary information by three inter-related services (association, association is gone in association again) to DS.
But, at wireless distribution system (Wireless Distribution System, be abbreviated as WDS) in, between AP by wireless channel find, authentication between negotiation method, AP between data transmission manner and AP and mode of data encryption etc. all do not have unified solution.
That is to say, when structure comprises the WLAN (wireless local area network) of extended service set, data need be transmitted between AP, but owing to do not formulate the standard of authentication between the AP, connection and data encryption at present, each self-defining proprietary protocol of having realized that the manufacturer of AP intercommunication is to use mostly carries out, can not intercommunication between the AP of different vendor thereby cause.
Summary of the invention
The object of the present invention is to provide the wireless communications method that can overcome at least a defective that exists in the prior art.
For achieving the above object, the invention provides a kind of method of wireless communication that is used for carrying out between at least two WAP (wireless access point), described at least two WAP (wireless access point) comprise first WAP (wireless access point) and second WAP (wireless access point), said method comprising the steps of:
S102) described first WAP (wireless access point) sends the claim frame of inquiring after that has the wireless distribution system information element to described second WAP (wireless access point) at least; Wherein, described wireless distribution system information element is used to show, the claim frame of seeking of WAP (wireless access point) that wireless distribution system connects is supported in this request that is a WAP (wireless access point) sends;
S104) described second WAP (wireless access point) responds the claim frame of inquiring after from described first WAP (wireless access point), sends the response frame of inquiring after that has the wireless distribution system information element to described first WAP (wireless access point);
S106) described first WAP (wireless access point) sends association request frame to described second WAP (wireless access point);
S108) described second WAP (wireless access point) responds the association request frame from described first WAP (wireless access point), sends the connection response frame to described first WAP (wireless access point); And
S110) set up radio communication between described first WAP (wireless access point) and described second WAP (wireless access point) and connect, described first WAP (wireless access point) and described second WAP (wireless access point) are carried out data frames exchange;
S116) described second WAP (wireless access point) starts ageing timer;
S118) if described second WAP (wireless access point) is not received any frame from described first WAP (wireless access point) in the ageing time section of regulation, then described second WAP (wireless access point) sends the claim frame of inquiring after that has the wireless distribution system information element to described first WAP (wireless access point).
Above-mentioned wireless distribution system information element comprises element identification codes territory, length field, organizes the unique identification territory, organizes the unique identification type field, organizes unique identification subtype territory and version field.
In said method, at described step S102) further comprising the steps of before: the S100) basic service set identification of described second WAP (wireless access point) of configuration on described first WAP (wireless access point).
In said method, at described step S110) afterwards, further comprising the steps of: as, then to send cancellation connection frame to the other side if S114) any in described first WAP (wireless access point) and described second WAP (wireless access point) or both think to need to disconnect and are connected.
Above-mentioned cancellation connects frame and comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organizes code domain, first kind territory, version field, second type field, reason code territory and Frame Check Sequence territory.
In said method, at described step S110) afterwards, further comprising the steps of: as, then to send cancellation connection frame to the other side if S115) any in described first WAP (wireless access point) and described second WAP (wireless access point) or both think to need to disconnect and are connected.
In said method, at described step S118) after, it is further comprising the steps of: if S120) described second WAP (wireless access point) does not receive replying from described first WAP (wireless access point), then described second WAP (wireless access point) sends cancellation to described first WAP (wireless access point) and connects frame, and enters not-connected status by connection status.
In said method, at described step S120) further comprising the steps of afterwards: S122) described first WAP (wireless access point) starts the scanning timer, transmission has the claim frame of inquiring after of wireless distribution system information element, other WAP (wireless access point) that active scan can insert.
In said method, adopt once mutual form to authenticate by the open authentication algorithm between described first WAP (wireless access point) and described second WAP (wireless access point).
When adopting the open authentication algorithm to authenticate, described verification process occurs in described S110) before, may further comprise the steps: S124) described first WAP (wireless access point) sends authentication request frames to described second WAP (wireless access point); S126) described second WAP (wireless access point) sends authentication response frames in response to the authentication request frames from described first WAP (wireless access point) to described first WAP (wireless access point); S128) if authentication success is then set up the radio communication connection between described first WAP (wireless access point) and described second WAP (wireless access point); And S130) if authentication is unsuccessful, then described first WAP (wireless access point) enters not-connected status, sends the claim frame of inquiring after that has the wireless distribution system information element, other WAP (wireless access point) that active scan can insert.
In said method, described authentication request frames and described authentication response frames include frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, algorithm territory, authenticated exchange serial number territory, conditional code territory and Frame Check Sequence territory.
In said method, the value in the authenticated exchange serial number territory in the described authentication request frames is 1, and the value in the authenticated exchange serial number territory in the described authentication response frames is 2.
In said method, adopt twice mutual form to authenticate by the shared key authentication algorithm between described first WAP (wireless access point) and described second WAP (wireless access point).
When adopting the shared key authentication algorithm to authenticate, described verification process occurs in described S110) before, may further comprise the steps: S132) described first WAP (wireless access point) sends first authentication frame to described second WAP (wireless access point); S134) described second WAP (wireless access point) sends second authentication frame in response to first authentication frame from described first WAP (wireless access point) to described first WAP (wireless access point); S136) described first WAP (wireless access point) sends the 3rd authentication frame in response to second authentication frame from described second WAP (wireless access point) to described second WAP (wireless access point); S138) described second WAP (wireless access point) sends the 4th authentication frame in response to the 3rd authentication frame from described first WAP (wireless access point) to described first WAP (wireless access point); S140) if authentication success is then set up the radio communication connection between described first WAP (wireless access point) and described second WAP (wireless access point); And S142) if authentication is unsuccessful, then described first WAP (wireless access point) enters not-connected status, sends the claim frame of inquiring after that has the wireless distribution system information element, other WAP (wireless access point) that active scan can insert.
Described first authentication frame and described the 4th authentication frame include frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, algorithm territory, authenticated exchange serial number territory, conditional code territory and Frame Check Sequence territory.The value in the authenticated exchange serial number territory of described first authentication frame is 1, and the value in the authenticated exchange serial number territory of described the 4th authentication frame is 4.
Described second authentication frame is the authentication frame that has challenge text, and it comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organizes code domain, first kind territory, version field, second type field, algorithm territory, authenticated exchange serial number territory, conditional code territory, challenge text territory and Frame Check Sequence territory.The value in the authenticated exchange serial number territory of described second authentication frame is 2.
Described the 3rd authentication frame is the authentication frame that has challenge text and initialization vector, and it comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organizes code domain, first kind territory, version field, second type field, initialization vector territory, algorithm territory, authenticated exchange serial number territory, conditional code territory, challenge text territory and Frame Check Sequence territory.The value in the authenticated exchange serial number territory of described the 3rd authentication frame is 3.
In said method, described association request frame comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organizes code domain, first kind territory, version field, second type field, ability information territory, services set identification code territory, supporting rate territory, strong secure network territory, physical layer spreading rate frame territory, extended rate set territory and Frame Check Sequence territory.Described connection response frame comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organizes code domain, first kind territory, version field, second type field, ability information territory, conditional code territory, supporting rate territory, strong secure network territory, physical layer spreading rate frame territory, extended rate set territory and Frame Check Sequence territory.
In said method, carry out capability negotiation by the ability information territory in described association request frame and the described connection response frame between described first access point and described second access point.Described ability information territory is identical with capability information field in 802.11.
In said method, described Frame comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, data field and Frame Check Sequence territory.
In said method, described Frame is a scrambled data frame, comprising: frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, initialization vector territory, purpose service access point territory, source service access point territory, control domain, organization unique identifier territory, virtual local area network tags territory, type field, data field, integrity check codomain and Frame Check Sequence territory.
Owing to provide the solution of authentication, connection, data communication and the data encryption of communicating by letter between the AP among the ESS according to wireless communications method of the present invention and system, so can guarantee to carry out reliable and effective communication between the AP (AP that comprises different vendor).
Description of drawings
Fig. 1 shows the state of WDS;
Fig. 2 a shows the flow chart according to the wireless communications method of the automatic connected mode of employing WDS of the present invention;
Fig. 2 b shows the flow chart according to the wireless communications method of employing WDS manual configuration connected mode of the present invention;
Fig. 3 shows the flow chart of the maintenance active mechanism of realizing WDS;
Fig. 4 shows the schematic diagram of enforcement according to the wireless communication system 400 of wireless communications method of the present invention;
Fig. 5 a shows inquiring after claim frame and inquiring after the form of the wireless distribution system information element that response frame has of using in wireless communications method according to the present invention and system;
Fig. 5 b shows the form of the association request frame that uses in wireless communications method according to the present invention and system;
Fig. 5 c shows the form of the connection response frame that uses in wireless communications method according to the present invention and system;
Fig. 5 d shows the form that the cancellation of using is connected frame in wireless communications method according to the present invention and system;
Fig. 5 e shows the form of the Frame that uses in wireless communications method according to the present invention and system;
Fig. 6 shows the flow chart when using the open authentication algorithm to carry out an interactive authentication in wireless communications method according to the present invention and system;
Fig. 7 shows the flow chart when using the shared key authentication algorithm to carry out twice interactive authentication in wireless communications method according to the present invention and system;
Fig. 8 shows the authentication request frames when the use open authentication algorithm shown in Fig. 6 carries out an interactive authentication and the form of authentication response frames;
Fig. 9 a shows the form of first authentication frame when the use shared key authentication algorithm shown in Fig. 7 carries out twice interactive authentication;
Fig. 9 b shows the form of second authentication frame when the use shared key authentication algorithm shown in Fig. 7 carries out twice interactive authentication;
Fig. 9 c shows the form of the 3rd authentication frame when the use shared key authentication algorithm shown in Fig. 7 carries out twice interactive authentication;
Fig. 9 d shows the form of the 4th authentication frame when the use shared key authentication algorithm shown in Fig. 7 carries out twice interactive authentication; And
Figure 10 shows ESS of the prior art.
Embodiment
Referring now to accompanying drawing specific embodiments of the invention are described, should be appreciated that specific embodiment described herein only is used to explain the present invention, and be not used in qualification the present invention.
As described in the background section, when structure comprised the WLAN (wireless local area network) of extended service set, data need be transmitted between AP.Because between AP, do not authenticate in the prior art at present, the unified technical scheme of connection, transfer of data and data encryption, each has realized the self-defining proprietary protocol that the manufacturer of AP intercommunication all is to use, and causes the AP of different vendor can not intercommunication.
The present invention defines the automatic discovery of AP, authentication connected mode between the AP and the encrypting and decrypting mode of transfer of data.Purpose is that the automatic discovery for the authentication of mutual communication between the AP, connection, data ciphering and deciphering and AP provides a kind of unified technical scheme, to realize the intercommunication between the AP of different vendor.
Below, the state of WDS is described, Fig. 1 shows the state of WDS.Corresponding to the connection procedure of WDS, WDS has four kinds of states: scanning mode, do not connect unverified, connect and unverifiedly authenticate with being connected.
1. scanning mode
Connect at WDS, AP uses active scan to inquire after and supports the AP that WDS connects in the network.
Active scan:
AP comes can insert in the scan for networks AP that WDS connects by the claim frame of inquiring after that sends the band WDS IE that broadcasts.The AP that inquires after claim frame that receives band WDS IE is by rewinding the scanning that response frame responds AP of inquiring after of WDS IE.
The active scan rules:
1. send and inquire after frame;
2. remove and start and inquire after timer; And
If 3. reach the maximum scan time and do not receive and inquire after response frame then start a new wheel scan process inquiring after timer, inquire after response frame then finish scanning process if received.The time of maximum scan herein be meant can be provided with one take turns WDS sweep time.
AP does not receive any frame when being in scanning mode except inquiring after response frame.
2. do not connect un-authenticated state
The AP end of scan enters and do not connect un-authenticated state afterwards, is not connecting AP adding of un-authenticated state AP selection.AP initiates the WDS connection by sending the WDS association request frame, if receive the WDS connection response frame that WDS peer end of the connection AP sends, and reason code indication successful connection, then AP enters and connects un-authenticated state.
First access point has the connection ageing timer, starts to connect ageing timer after first access point sends the WDS association request frame, if do not receive the WDS connection response frame that second access point sends in ageing time, then restarts scanning process.
3. connected un-authenticated state
The WDS successful connection of AP then enters and has connected un-authenticated state.AP initiates the WDS verification process by sending the WDS authentication request frames, if authentication success, then AP enters and connects verified status.
4. connected verified status
The AP authentication success then enters and has connected verified status.Can carry out normal transfer of data connecting verified status AP.
Four kinds of states corresponding to WDS have four kinds of WDS frames.
1 class frame
1 class frame allows to use in state 1, state 2, state 3 and state 4.
1. with the Probe Request frame of WDS IE
2. with the Probe Response frame of WDS IE
2 class frames
Under the condition of and if only if the end of scan, 2 class frames allow to use for 4 times at state 2, state 3 and state.
1. WDS association request frame
2. WDS connection response frame
3. the WDS cancellation connects frame
3 class frames
Under the condition that and if only if has connected, 3 class frames allow to use for 4 times at state 3 and state
1. WDS authentication request frames
2. WDS authentication response frames
3. cancel the WDS authentication frame
4 class frames
Under the condition of and if only if success identity, only allow to use 4 class frames 4 times at state.
1. four address Frame
Defined the type of WDS frame in the table 1
| The frame type | Type specification | |
| 0 | The WDS |
|
| 1 | WDS |
|
| 2 | The WDS cancellation connects |
|
| 3 | The |
|
| 4 | WDS cancels |
|
| 5～255 | Retention |
Table 1 WDS frame type
Type field use value 0x88a7 in the SNAP head represents it is the management frames of WDS.
Version field in the WDS frame head is represented the version value of current WDS, and this length of field is 1 byte; Type field is used for distinguishing various WDS management frames, and length is 1 byte.
Ability information, SSID, supporting rate collection, challenge text (challenge) are with 820.11 definition, and RSN is identical with definition among the 802.11i, and ERP, extended rate set are seen 802.11g.
The WDS association request frame is used to initiate the WDS connection request, and WDS connection response frame is used for the response to the WDS connection request, judges the whether reason of success and failure of connection by conditional code.When at state 3, receive Frame or when state 4 needs cancellation to be connected with state 3, use the WDS cancellation to connect frame.
The authentication frame of the authentication frame of WDS authentication frame, WDS band challenge text and WDS band challenge text band iv is used for setting up between the AP authentication.The WDS authentication frame is used for first frame of open authentication and shared key authentication, second frame of open authentication and the 4th frame of shared key authentication.The authentication frame of WDS band challenge text is used for second frame of shared key authentication, and the authentication frame of WDS band challenge text band iv is used for the 3rd frame of shared key authentication.
By wireless channel, have two kinds of schemes can realize discovery mechanism between the AP:
1. find AP by the beacon frame that receives the AP transmission, this is a kind of mode of drive sweep; And
2. find AP by sending Probe Request frame (request of inquiring after), this is a kind of mode of active scan.
Adopt second kind of scheme to realize the discovery of AP according to wireless communications method of the present invention and system, support the AP that connects between AP by sending special P robe Request frame active scan.Why being referred to as special P robe Request frame is because of the Probe Request frame of having expanded in the 802.11 common series standards, defined a wireless distribution system (Wireless Distribution System herein, be abbreviated as WDS) wireless distribution system information element (Wireless Distribution System Information Element is abbreviated as WDS IE).Show the Probe Request frame of the AP that this request support WDS that is an AP sends connects by WDS IE, in same ESS, have how many AP support WDS to connect thereby can inquire after.WDS also supports two kinds of connected modes: a kind of is to inquire after among the ESS all by the expansion Probe Request frame of broadcasting can carry out the AP that WDS connects; Another kind is to carry out WDS to the AP of appointment and inquire after request by sending orientation (clean culture) expansion Probe Request frame.First kind of mode specifically connects certain AP by AP decision automatically, so be referred to as the automatic connected mode of WDS owing to only need the SSID of configuration connection; The second way is owing to need the basic service set identification (Basic service set identification is abbreviated as BSSID) of configuration AP to be connected, and connected AP is by the configuration decision, so also be referred to as WDS manual configuration connected mode.
Fig. 2 a shows the flow chart according to the wireless communications method of the automatic connected mode of employing WDS of the present invention.Carrying out may further comprise the steps in the method for wireless communication between at least two WAP (wireless access point) (comprising first WAP (wireless access point) and second WAP (wireless access point)) according to provided by the present invention:
At step S102, first WAP (wireless access point) sends to second WAP (wireless access point) at least and inquires after claim frame;
At step S104, second WAP (wireless access point) responds the claim frame of inquiring after from first WAP (wireless access point), sends to first WAP (wireless access point) and inquires after response frame;
At step S106, first WAP (wireless access point) sends association request frame to the second wireless connections point;
At step S108, second WAP (wireless access point) responds the association request frame from first WAP (wireless access point), sends the connection response frame to first WAP (wireless access point); And
At step S110, between first WAP (wireless access point) and second WAP (wireless access point), to set up radio communication and connect, first WAP (wireless access point) and second WAP (wireless access point) are carried out data frames exchange (exchanges data).
In above-mentioned wireless communications method, after step S110, also comprise step S114, if thinking to need to disconnect, any in first WAP (wireless access point) and second WAP (wireless access point) or both are connected, then send cancellation and connect frame, and disconnect connection, enter not-connected status to the other side.
Should be appreciated that first WAP (wireless access point) mentioned herein and second WAP (wireless access point) can exchange, " first " and " second " limiting meaning not itself only is convenient in order to narrate.
Fig. 2 b shows the flow chart according to the wireless communications method of employing WDS manual configuration connected mode of the present invention.
Compare with the method shown in Fig. 2 a, adopt the wireless communications method of WDS manual configuration connected mode and adopt the difference of the wireless communications method of the automatic connected mode of WDS to be: first WAP (wireless access point) to second WAP (wireless access point) send inquire after claim frame before, need on first WAP (wireless access point), dispose basic service set identification (the Basic service set identification of second WAP (wireless access point), be abbreviated as BSSID), just: before step S102, also to carry out step S100, the basic service set identification of configuration second WAP (wireless access point) on first WAP (wireless access point).
In the wireless communications method shown in Fig. 2 a and Fig. 2 b, can also realize maintenance activity (keep alive) mechanism of WDS by after step S110, adding following steps, as shown in Figure 3:
S116) second WAP (wireless access point) starts ageing timer;
S118) if second WAP (wireless access point) is not received any frame from first WAP (wireless access point) in the ageing time section of regulation, then second WAP (wireless access point) sends the claim frame of inquiring after that has the wireless distribution system information element to first WAP (wireless access point); And
S120) if second WAP (wireless access point) does not receive from the replying of first WAP (wireless access point), then second WAP (wireless access point) sends cancellation to first WAP (wireless access point) and connects frame, and enters not-connected status by connection status.
Fig. 4 shows the schematic diagram of the wireless communication system 400 that is used to implement the wireless communications method according to the present invention.This wireless communication system 400 comprises at least two WAP (wireless access point), in the embodiment of Fig. 4, show five WAP (wireless access point), be respectively first WAP (wireless access point) (Access Point is abbreviated as AP), 402, second WAP (wireless access point) 404, the 3rd WAP (wireless access point) 406, the 4th WAP (wireless access point) 408 and the 5th WAP (wireless access point) 410.These WAP (wireless access point) are provided with WDS and inquire after claim frame, WDS and inquire after response frame, WDS association request frame, WDS connection response frame, WDS authentication request frames, WDS authentication response frames and WDS cancellation and connect frame.Wireless communication system 400 according to the present invention is used for the wireless communications method shown in execution graph 2a and Fig. 2 b.
When adopting the automatic connected mode of WDS, first WAP (wireless access point) 402 is outwards sent out broadcasting and is with the Probe Request frame of WDS IE to inquire after the AP that supports that WDS connects, and selects one to carry out the WDS connection from the AP that the support WDS that inquires after connects.
Receiving square end, receiving the Probe Request frame of the broadcasting band WDS IE that first WAP (wireless access point) 402 sends,, then returning Probe Response frame if support WDS to connect.
When receiving the WDS association request frame of the other side's transmission, the WDS connection request content frame according to receiving judges whether and can connect, and returns WDS connection response frame, by conditional code indication successful connection or failure.Its connection procedure is as follows:
1. the Probe Request frame of WDS IE is with in 402 broadcasting of first WAP (wireless access point);
2. support the arbitrary one or more Probe Response frames that rewind WDS IE in second WAP (wireless access point) 404, the 3rd WAP (wireless access point) 406, the 4th WAP (wireless access point) 408 and the 5th WAP (wireless access point) 410 that WDS connects;
3. arbitrary one or more the WDS connection requests of first WAP (wireless access point) 402 in supporting second WAP (wireless access point) 404, the 3rd WAP (wireless access point) 406, the 4th WAP (wireless access point) 408 and the 5th WAP (wireless access point) 410 that WDS connects;
4. hypothesis receives that second WAP (wireless access point) 404 of WDS connection request sends the WDS connection response to first WAP (wireless access point) 402;
5. first WAP (wireless access point) 402 sends the WDS authentication request frames to second WAP (wireless access point) 404;
6. second WAP (wireless access point) 404 sends the WDS authentication response frames to first WAP (wireless access point) 402; And
7. set up the WDS transmission channel between first WAP (wireless access point) 402 and second WAP (wireless access point) 404, carry out transfer of data.
When adopting WDS manual configuration connected mode, first WAP (wireless access point) 404 at first disposes the BSSID that wishes the WAP (wireless access point) (for example second WAP (wireless access point) 406) connect with it, ProbeRequest frame to second WAP (wireless access point), 406 directive sending band WDS IE, second WAP (wireless access point) 406 sends the Probe Response frame of being with WDSIE to first WAP (wireless access point) 404, and first WAP (wireless access point) 404 connects to 406 WDS connection requests of second WAP (wireless access point).Second WAP (wireless access point) 406 judges whether and can connect according to the content of the WDS association request frame that receives, and sends WDS connection response frame to first WAP (wireless access point) 404, by conditional code indication successful connection or failure.Its connection procedure is as follows:
1. first WAP (wireless access point) 404 disposes the BSSID of second WAP (wireless access point) 406 of desires connection;
2. first WAP (wireless access point) 404 is to the Probe Request frame of second WAP (wireless access point), 406 directive sending band WDS IE;
3. second WAP (wireless access point) 406 sends the Probe Response frame of band WDSIE to first WAP (wireless access point) 404;
4. first WAP (wireless access point) 404 is to 406 WDS association request frames of second WAP (wireless access point);
5. second WAP (wireless access point) 406 sends WDS connection response frame to first WAP (wireless access point) 404;
6. first WAP (wireless access point) 404 sends the WDS authentication request frames in response to WDS connection response frame to second WAP (wireless access point) 406;
7. second WAP (wireless access point) 406 sends the WDS authentication response frames to first WAP (wireless access point) 404; And
8. set up the WDS transmission channel between first WAP (wireless access point) 402 and second WAP (wireless access point) 404, carry out transfer of data.
Followingly the form of the frame that uses in wireless communication procedure is described with reference to Fig. 5 a to 5e.
Fig. 5 a shows inquiring after claim frame and inquiring after the form of the wireless distribution system information element that response frame has of using in wireless communications method according to the present invention and system.As can be seen from the figure, wireless distribution system information element (WDS IE) comprise element identification codes territory (ElementID), length field (Length), organize the unique identification territory (Organization unique identifier, OUI), organize unique identification type field (OUIType), organize unique identification subtype territory (OUI Subtype) and version field (Version).ElementID is a component identifier, be used for identifying different information elements, the self-defined IE sign 221 of the manufacturer that WDS IE uses 802.11 standards to keep, the length of WDS IE is fixed as 6 bytes, the OUI of 3 bytes (tissue unique identification), the OUI type field of 1 byte, the OUI subtype territory of 1 byte and the version information of 1 byte.Use herein but be not limited to the OUI:00-E0-FC of Huawei Company, it all is 1 that the version information of OUI type, subtype and WDS IE all is worth.
The thresholding corresponding relation of WDS IE is as shown in table 2:
| Field | Value |
| Element?ID | 221 |
| Length | 6 |
| OUI | 00:E0:FC |
| OUI? |
1 |
| OUI? |
1 |
Table 2 WDS IE thresholding correspondence table
In the request of inquiring after (Probe Request) frame entity, increased WDS IE item.
It is as shown in table 3 that WDS inquires after the frame entity of claim frame
| Sequence | Content | Remarks | |
| 4 | WDS?IE | Need set up the Probe Request frame that AP that WDS connects sends and have the WDS information element |
Table 3 WDS inquires after the frame entity of claim frame
In Probe Response frame entity, increased WDS IE item
It is as shown in table 4 that WDS inquires after the frame entity of response frame
| Sequence number | Content | Remarks |
| 13 | WDS?IE | Have only in the Probe Request frame that receives to carry WDS IE, and the inquiring after of AP generation of supporting WDS to connect just used WDS IE in the response frame |
Table 4 WDS inquires after the frame entity of response frame
Introduce the WDS management frames below in conjunction with Fig. 5 b-5e, the WDS management frames comprises that WDS association request frame, WDS connection response frame, WDS cancellation connect frame, WDS authentication request frames, WDS authentication response frames and cancellation WDS authentication frame.In the present invention, used that four address Frame defines the WDS management frames in 820.11.Show it is the WDS management frames by the type field in the 802.2 SNAP heads.
Fig. 5 b shows the form of the WDS association request frame that uses in wireless communications method according to the present invention and system.The WDS association request frame comprises the frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), the sequential control territory, four-address territory (address 4), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (CNTL), organize code domain (Orgcode), first kind territory, version field, second type field, the ability information territory, services set identification code territory (SSID), the supporting rate territory, strong secure network territory (RSN), physical layer spreading rate frame territory (ERP), the extended rate set territory, and Frame Check Sequence territory (FCS).
Fig. 5 c shows the form of the WDS connection response frame that uses in wireless communications method according to the present invention and system.WDS connection response frame comprises the frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), the sequential control territory, four-address territory (address 4), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (CNTL), organize code domain (Orgcode), first kind territory, version field, second type field, the ability information territory, the conditional code territory, the supporting rate territory, strong secure network territory (RSN), physical layer spreading rate frame territory (ERP), the extended rate set territory, and Frame Check Sequence territory (FCS).
Fig. 5 d shows the form that the WDS cancellation of using is connected frame in wireless communications method according to the present invention and system.Cancellation connects that frame comprises frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), sequential control territory, four-address territory (address 4), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (CNTL), organizes code domain (Orgcode), first kind territory, version field, second type field, reason code territory and Frame Check Sequence territory (FCS).
In the present invention, the WDS Frame is four address 802.11 Frames.Fig. 5 e shows the form of the WDS Frame that uses in wireless communications method according to the present invention and system.The WDS Frame comprises frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), sequential control territory, four-address territory (address 4), data field and Frame Check Sequence territory (FCS).
The encapsulation format of 4 addresses is adopted at the WDS two ends, supports data encryption, and the while is supported vlans tag also.WDS uses in 802.11 four-address Frames of set of frame control domain TO DS, From DS.According to IEEE Std 802.1Q-1998s standard definition, the WDS scrambled data frame of band VLAN TAG comprises: the frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), the sequential control territory, four-address territory (address 4), initialization vector territory (IV), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (control), organization unique identifier territory (OUI), virtual local area network tags territory (VLAN TAG), type field (type), data field (Data), integrity check codomain (ICV), and Frame Check Sequence territory (FCS).Wherein the length of IV (initialization vector), ICV (integrity check value) is different and different according to cryptographic algorithm.
For the fail safe that guarantees to communicate by letter, need the identity of first WAP (wireless access point) and second WAP (wireless access point) be authenticated, can adopt identifying algorithm to authenticate, can use the open authentication algorithm, also can use the shared key authentication algorithm.Fig. 6 and Fig. 7 show the flow chart when adopting open authentication algorithm and shared key authentication algorithm to authenticate respectively.
As shown in Figure 6, when adopting the open authentication algorithm, carry out once alternately between first WAP (wireless access point) and second WAP (wireless access point), verification process occurs in after the step S108 and before the step S110, may further comprise the steps:
S124) first WAP (wireless access point) sends authentication request frames to second WAP (wireless access point);
S126) second WAP (wireless access point) sends authentication response frames in response to the authentication request frames from first WAP (wireless access point) to first WAP (wireless access point);
S128) if authentication success is then set up the radio communication connection between first WAP (wireless access point) and second WAP (wireless access point); And
S130) if authentication is unsuccessful, then first WAP (wireless access point) enters not-connected status, sends the claim frame of inquiring after that has the wireless distribution system information element, other wireless connections point that active scan can insert.
As shown in Figure 7, when adopting the shared key authentication algorithm, carry out between first WAP (wireless access point) and second WAP (wireless access point) twice mutual, verification process occurs in after the step S108 and before the step S110, may further comprise the steps:
S132) first WAP (wireless access point) sends first authentication frame to second WAP (wireless access point);
S134) second WAP (wireless access point) sends second authentication frame in response to first authentication frame from first WAP (wireless access point) to first WAP (wireless access point);
S136) first WAP (wireless access point) sends the 3rd authentication frame in response to second authentication frame from second WAP (wireless access point) to second WAP (wireless access point);
S138) second WAP (wireless access point) sends the 4th authentication frame in response to the 3rd authentication frame from first WAP (wireless access point) to first WAP (wireless access point);
S140) if authentication success is then set up the radio communication connection between first WAP (wireless access point) and second WAP (wireless access point); And
S142) if authentication is unsuccessful, then first WAP (wireless access point) enters not-connected status, sends the claim frame of inquiring after that has the wireless distribution system information element, other wireless connections point that active scan can insert.
To those skilled in the art, be apparently, except above-mentioned open system authentication and shared key authentication, can also use other authentication, repeat no more.Can be for open system authentication and shared key authentication referring to the 8th chapter Authentication and privacy of IEEE802.11.
The authentication request frames of using when referring to Fig. 8 employing open authentication algorithm being described below and the form of authentication response frames.
Authentication request frames and authentication response frames include: the frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), the sequential control territory, four-address territory (address 4), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (CNTL), organize code domain (Orgcode), first kind territory, version field, second type field, algorithm territory (algoNo), authenticated exchange serial number territory (transSeqNo), conditional code territory (statusCode), and Frame Check Sequence territory (FCS).The value in the authenticated exchange serial number territory in the authentication request frames is 1, and the value in the authenticated exchange serial number territory in the authentication response frames is 2.
In addition, when adopting the open authentication algorithm, the value in the algorithm territory (algoNo) in authentication request frames and the authentication response frames is 0.
The form of first authentication frame, second authentication frame, the 3rd authentication frame and the 4th authentication frame when illustrating respectively that referring to Fig. 9 a to 9d employing shared key authentication algorithm authenticates respectively below.
First authentication frame and the 4th authentication frame include: the frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), the sequential control territory, four-address territory (address 4), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (CNTL), organize code domain (Orgcode), first kind territory, version field, second type field, algorithm territory (algoNo), authenticated exchange serial number territory (transSeqNo), conditional code territory (statusCode), and Frame Check Sequence territory (FCS).The value in the authenticated exchange serial number territory (transSeqNo) of first authentication frame is that the value in the authenticated exchange serial number territory (transSeqNo) of 1, the four authentication frame is 4.
Second authentication frame is the authentication frame that has challenge text, and it comprises the frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), the sequential control territory, four-address territory (address 4), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (CNTL), organize code domain (Orgcode), first kind territory, version field, second type field, algorithm territory (algoNo), authenticated exchange serial number territory (transSeqNo), conditional code territory (statusCode), challenge text territory (challenge), and Frame Check Sequence territory (FCS).The value in the authenticated exchange serial number territory of described second authentication frame is 2.
The 3rd authentication frame is the authentication frame that has challenge text and initialization vector, and it comprises the frame control domain, duration field, first address field (address 1), second address field (address 2), three-address territory (address 3), the sequential control territory, four-address territory (address 4), purpose service access point territory (DSAP), source service access point territory (SSAP), control domain (CNTL), organize code domain (Orgcode), first kind territory, version field, second type field, initialization vector territory (IV), algorithm territory (algoNo), authenticated exchange serial number territory (transSeqNo), conditional code territory (statusCode), challenge text territory (challenge), and Frame Check Sequence territory (FCS).The value in the authenticated exchange serial number territory of described the 3rd authentication frame is 3.
When adopting the shared key authentication algorithm, the value in the algorithm territory (algoNo) in first authentication frame, second authentication frame, the 3rd authentication frame and the 4th authentication frame is 1.
As seen by above-mentioned, transSeqNo represents the authenticated exchange serial number, and this length of field is 2 bytes.In verification process, it increases progressively with the exchange of authentication frame.IV is the key and the initialization vector of 4 bytes.First authentication frame and the 3rd authentication frame belong to 3 class frames, are the WDS authentication request frames; Second authentication frame and the 4th authentication frame belong to 3 class frames, are the WDS authentication response frames.
Provide the solution of authentication, connection, data communication and the data encryption of communicating by letter between the AP among the ESS according to wireless communications method of the present invention and system, so can guarantee to carry out reliable and effective communication between the AP (AP that comprises different vendor).
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (27)
1. one kind is used for carrying out method of wireless communication between at least two WAP (wireless access point), and described at least two WAP (wireless access point) comprise first WAP (wireless access point) and second WAP (wireless access point), it is characterized in that, said method comprising the steps of:
S102) described first WAP (wireless access point) sends the claim frame of inquiring after that has the wireless distribution system information element to described second WAP (wireless access point) at least; Wherein, described wireless distribution system information element is used to show, the claim frame of inquiring after of WAP (wireless access point) that wireless distribution system connects is supported in this request that is a WAP (wireless access point) sends;
S104) described second WAP (wireless access point) responds the claim frame of inquiring after from described first WAP (wireless access point), sends the response frame of inquiring after that has the wireless distribution system information element to described first WAP (wireless access point);
S106) described first WAP (wireless access point) sends association request frame to described second WAP (wireless access point);
S108) described second WAP (wireless access point) responds the association request frame from described first WAP (wireless access point), sends the connection response frame to described first WAP (wireless access point); And
S110) set up radio communication between described first WAP (wireless access point) and described second WAP (wireless access point) and connect, described first WAP (wireless access point) and described second WAP (wireless access point) are carried out data frames exchange;
S116) described second WAP (wireless access point) starts ageing timer;
S118) if described second WAP (wireless access point) is not received any frame from described first WAP (wireless access point) in the ageing time section of regulation, then described second WAP (wireless access point) sends the claim frame of inquiring after that has the wireless distribution system information element to described first WAP (wireless access point).
2. according to claim 1ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that described wireless distribution system information element comprises element identification codes territory, length field, organizes the unique identification territory, organizes the unique identification type field, organizes unique identification subtype territory and version field.
3. between at least two WAP (wireless access point), carry out method of wireless communication according to each described being used in claim 1 or 2, it is characterized in that, at described step S102) further comprising the steps of before:
S100) basic service set identification of described second WAP (wireless access point) of configuration on described first WAP (wireless access point).
4. according to claim 3 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, at described step S110) afterwards, further comprising the steps of:
S114) if any in described first WAP (wireless access point) and described second WAP (wireless access point) or both think to need to disconnect to be connected, then to send cancellation and connect frame, and disconnect connection, enter not-connected status to the other side.
5. according to claim 4ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that described cancellation connects frame and comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organizes code domain, first kind territory, version field, second type field, reason code territory and Frame Check Sequence territory.
6. between at least two WAP (wireless access point), carry out method of wireless communication according to each described being used in claim 1 or 2, it is characterized in that, at described step S110) afterwards, further comprising the steps of:
S114) if any in described first WAP (wireless access point) and described second WAP (wireless access point) or both think to need to disconnect to be connected, then to send cancellation and connect frame, and disconnect connection, enter not-connected status to the other side.
7. between at least two WAP (wireless access point), carry out method of wireless communication according to each described being used in claim 1 or 2, it is characterized in that, at described step S118) after, further comprising the steps of:
S120) if described second WAP (wireless access point) does not receive from the replying of described first WAP (wireless access point), then described second WAP (wireless access point) sends cancellation to described first WAP (wireless access point) and connects frame, and enters not-connected status by connection status.
8. according to claim 7 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, at described step S120) further comprising the steps of afterwards:
S122) described first WAP (wireless access point) starts the scanning timer, sends the claim frame of inquiring after that has the wireless distribution system information element, other WAP (wireless access point) that active scan can insert.
9. according to each describedly is used for carrying out method of wireless communication in claim 1 or 2 between at least two WAP (wireless access point), it is characterized in that, adopt once mutual form to authenticate by the open authentication algorithm between described first WAP (wireless access point) and described second WAP (wireless access point).
10. according to claim 9 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, described verification process occurs in described S110) before, may further comprise the steps:
S124) described first WAP (wireless access point) sends authentication request frames to described second WAP (wireless access point);
S126) described second WAP (wireless access point) sends authentication response frames in response to the authentication request frames from described first WAP (wireless access point) to described first WAP (wireless access point);
S128) if authentication success is then set up the radio communication connection between described first WAP (wireless access point) and described second WAP (wireless access point); And
S130) if authentication is unsuccessful, then described first WAP (wireless access point) enters not-connected status, sends the claim frame of inquiring after that has the wireless distribution system information element, other WAP (wireless access point) that active scan can insert.
11. according to claim 10ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that described authentication request frames and described authentication response frames include frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, algorithm territory, authenticated exchange serial number territory, conditional code territory and Frame Check Sequence territory.
12. according to claim 11ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that, the value in the authenticated exchange serial number territory in the described authentication request frames is 1, and the value in the authenticated exchange serial number territory in the described authentication response frames is 2.
13. according to each describedly is used for carrying out method of wireless communication in claim 1 or 2 between at least two WAP (wireless access point), it is characterized in that, adopt twice mutual form to authenticate by the shared key authentication algorithm between described first WAP (wireless access point) and described second WAP (wireless access point).
14. according to claim 13 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, described verification process occurs in described S110) before, may further comprise the steps:
S132) described first WAP (wireless access point) sends first authentication frame to described second WAP (wireless access point);
S134) described second WAP (wireless access point) sends second authentication frame in response to first authentication frame from described first WAP (wireless access point) to described first WAP (wireless access point);
S136) described first WAP (wireless access point) sends the 3rd authentication frame in response to second authentication frame from described second WAP (wireless access point) to described second WAP (wireless access point);
S138) described second WAP (wireless access point) sends the 4th authentication frame in response to the 3rd authentication frame from described first WAP (wireless access point) to described first WAP (wireless access point);
S140) if authentication success is then set up the radio communication connection between described first WAP (wireless access point) and described second WAP (wireless access point); And
S142) if authentication is unsuccessful, then described first WAP (wireless access point) enters not-connected status, sends the claim frame of inquiring after that has the wireless distribution system information element, other WAP (wireless access point) that active scan can insert.
15. according to claim 14ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that described first authentication frame and described the 4th authentication frame include frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, purpose service access point territory, source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, algorithm territory, authenticated exchange serial number territory, conditional code territory and Frame Check Sequence territory.
16. according to claim 15ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that, the value in the authenticated exchange serial number territory of described first authentication frame is 1, and the value in the authenticated exchange serial number territory of described the 4th authentication frame is 4.
17. according to claim 14ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that, described second authentication frame is the authentication frame that has challenge text, and it comprises the frame control domain, duration field, first address field, second address field, the three-address territory, the sequential control territory, four-address territory, purpose service access point territory, the source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, the algorithm territory, authenticated exchange serial number territory, the conditional code territory, the challenge text territory, and Frame Check Sequence territory.
18. according to claim 17 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, the value in the authenticated exchange serial number territory of described second authentication frame is 2.
19. according to claim 14ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that, described the 3rd authentication frame is the authentication frame that has challenge text and initialization vector, and it comprises the frame control domain, duration field, first address field, second address field, the three-address territory, the sequential control territory, four-address territory, purpose service access point territory, the source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, the initialization vector territory, the algorithm territory, authenticated exchange serial number territory, the conditional code territory, the challenge text territory, and Frame Check Sequence territory.
20. according to claim 19 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, the value in the authenticated exchange serial number territory of described the 3rd authentication frame is 3.
21. according to each describedly is used for carrying out method of wireless communication in claim 1 or 2 between at least two WAP (wireless access point), it is characterized in that described association request frame comprises the frame control domain, duration field, first address field, second address field, the three-address territory, the sequential control territory, four-address territory, purpose service access point territory, the source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, the ability information territory, services set identification code territory, the supporting rate territory, strong secure network territory, physical layer spreading rate frame territory, the extended rate set territory, and Frame Check Sequence territory.
22. according to claim 21ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that described connection response frame comprises the frame control domain, duration field, first address field, second address field, the three-address territory, the sequential control territory, four-address territory, purpose service access point territory, the source service access point territory, control domain, organize code domain, first kind territory, version field, second type field, the ability information territory, the conditional code territory, the supporting rate territory, strong secure network territory, physical layer spreading rate frame territory, the extended rate set territory, and Frame Check Sequence territory.
23. according to claim 22ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that, carry out capability negotiation by the ability information territory in described association request frame and the described connection response frame between described first access point and described second access point.
24. according to claim 23 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, described ability information territory is identical with capability information field in 802.11.
25. according to claim 1ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that described Frame comprises frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, data field and Frame Check Sequence territory.
26. according to claim 1 being used for carried out method of wireless communication between at least two WAP (wireless access point), it is characterized in that, described Frame is a scrambled data frame.
27. according to claim 26ly be used between at least two WAP (wireless access point), carrying out method of wireless communication, it is characterized in that described scrambled data frame comprises: frame control domain, duration field, first address field, second address field, three-address territory, sequential control territory, four-address territory, initialization vector territory, purpose service access point territory, source service access point territory, control domain, organization unique identifier territory, virtual local area network tags territory, type field, data field, integrity check codomain and Frame Check Sequence territory.
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- 2005-01-04 CN CNB2005100066048A patent/CN100461728C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492628A (en) * | 2002-09-11 | 2004-04-28 | 三星电子株式会社 | Method and system for matching user's state in network |
| WO2004098214A1 (en) * | 2003-04-29 | 2004-11-11 | Docomo Communications Laboratories Usa, Inc. | Fast active scanning wireless network apparatus and method |
| CN1455556A (en) * | 2003-05-14 | 2003-11-12 | 东南大学 | Wireless LAN safety connecting-in control method |
Non-Patent Citations (4)
| Title |
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| Link recovery in IEEE 802.11 WLAN using WDS. Marc Potoles, Jose Luis Valenzuela, David Perez, OriolSallent.http://ieeexplore.ieee.org/iel5/9530/30273/01390672.pdf. 2004 |
| Link recovery in IEEE 802.11 WLAN using WDS. Marc Potoles, Jose Luis Valenzuela, David Perez, OriolSallent.http://ieeexplore.ieee.org/iel5/9530/30273/01390672.pdf. 2004 * |
| Part11:Wireless LAN Medium Access Control(MAC) and Physical Layer (PHY) Specifications (IEEE Std802.11, 1999 Edition). http://www.ieee802.org/getieee802/802.11.html. 2003 |
| Part11:Wireless LAN Medium Access Control(MAC) and Physical Layer (PHY) Specifications (IEEE Std802.11, 1999 Edition). http://www.ieee802.org/getieee802/802.11.html. 2003 * |
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|---|---|
| CN1801753A (en) | 2006-07-12 |
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