CN1112014C - Wireless network roaming method of cross IP domain - Google Patents
Wireless network roaming method of cross IP domain Download PDFInfo
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- CN1112014C CN1112014C CN99111026.9A CN99111026A CN1112014C CN 1112014 C CN1112014 C CN 1112014C CN 99111026 A CN99111026 A CN 99111026A CN 1112014 C CN1112014 C CN 1112014C
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- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0019—Control or signalling for completing the hand-off for data sessions of end-to-end connection adapted for mobile IP [MIP]
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Abstract
The present invention relates to a wireless network roaming method of an IP crossing domain. The present invention combines an information switching mechanism of an IAPP of an original access point in an MAC layer with an information transferring mechanism of a mobile IP in an IP layer to make a mobile station cross different IP sub-networks for roaming. When the mobile station roams to different IP sub-networks, an access point A of a new wireless local area network finds out the IP address of the original access point B by a communication mechanism of the mobile IP in a network layer so as to send out an alternating request to the original access point B; then, the original access point B transfers back information frames alternatively responded by the communication mechanism of the mobile IP in the network layer, and in this way, the access point A can complete an alternating process.
Description
The present invention relates to a kind of loaming method of Wireless LAN, be meant a kind of method of the mobile mechanism in conjunction with mobile IP (Mobile IP) and IAPP especially, mobile radio station can be roved between the access point on different sub-network road.
Wireless LAN (Wireless LAN) standard of IEEE 802.11 has only defined the following networking agreement of MAC layer at present, does not also formulate the communication mechanism of networking layer.Communications protocol between access point (Access Point) must be come the information exchange system between the standard access point according to IAPP (access point agreement Inter Access Point Protocol mutually).According to the communication mechanism of IAPP, an access point is the information that obtains other access point by broadcast mode, uses when roaming for mobile radio station (mobiles tation).When access point is opened, just the networking is sent " notice request package " (announce requestpacket) of broadcast type, receive that the access point of this package just responds a package, package contains the information of this access point, as the MAC Address and the I P address of this access point.In the time of in mobile radio station roams to the scope of being served by another access point, then can send the request (reassociation request) that reconnects to new access point.At this moment, new access point just need be found out the IP address of the former Service Access Point of this mobile radio station, so that this access point is sent " alternately request " (handoff request), will be transferred to new access point to the service of this mobile radio station.
But when mobile radio station roves between the access point that is distributed in the different sub-network road, the communication mechanism of existing IAPP will be because of the obstruct of router, and can't obtain the IP address of the former Service Access Point of this mobile radio station, this is because most routers is for preventing from the generation of broadcast storm (broadcast storm), do not provide to pass on the service of package.Therefore, be positioned at the access point on different sub-network road, can't come exchange message by the communication modes of broadcast type, thereby can't learn information each other.In other words, when new access point is received the request that reconnects that mobile radio station sends, when if former access point is in different IP subnet roads with the new access point branch, then new access point can't be obtained the IP address of former access point from built-in MSDS (association table), then new access point can't be sent the alternately data frame of request to former access point, cause mobile radio station can't rove between the access point that is distributed in the different sub-network road, and then had a strong impact on the range of application of Wi-Fi.
The objective of the invention is to design a kind of wireless network roaming method of cross IP domain, a kind of method in conjunction with MobileIP and IAPP communication mechanism can rove between the access point on different subnet roads mobile radio station, to enlarge the range of application of Wi-Fi.Use the present invention's communication mechanism easily, mobile radio station need not to increase extra hardware device, under the situation that needn't change original software and hardware setting, can enjoy a trip between the access point on different sub-network road.
The object of the present invention is achieved like this: a kind of wireless network roaming method of cross IP domain, and described Wi-Fi includes the Wireless LAN that is positioned at different IP subnet road more than, it is characterized in that may further comprise the steps:
In the Wireless LAN at mobile radio station script place, provide an original net territory proxy module and an initial access point;
In the first purpose Wireless LAN of this mobile radio station, provide far access point of one first earth mat territory proxy module and first far away;
When mobile radio station directly roams to the first purpose Wireless LAN by the Wireless LAN at script place, receive the request that reconnects data frame from this mobile radio station;
Finish reconnect after, first far access point send and alternately ask data frame to the first earth mat territory far away proxy module;
At mobile radio station during, use the IP address of the original net territory proxy module that registration form write down of the MAC Address inquiry first earth mat territory far away proxy module of this mobile radio station successfully to the login of the first earth mat territory far away proxy module;
Set up one for this mobile radio station and replace the return address scratch list in the first earth mat territory far away proxy module, alternately the return address scratch list comprises the MAC Address of this mobile radio station, and this alternately asks the source IP addresses of data frame;
According to the IP address of the original net territory proxy module that from this registration form, is inquired, alternately ask the data frame to transfer to this original net territory proxy module this;
Inquire about the registration form that this original net territory proxy module is safeguarded, find out the IP address of last earth mat far away territory proxy module of this mobile radio station, when having the data of earth mat far away territory proxy module, then will alternately ask the data frame to transfer to this earth mat far away territory proxy module, when not having the data of earth mat far away territory proxy module, judge that a net territory proxy module is original net territory proxy module on this mobile radio station;
The inquiry contingency table when not having the MAC Address of this mobile radio station in contingency table, is broadcasted this data frame of alternately asking in the Wireless LAN at this mobile radio station script place;
According to this broadcasting alternately ask the data frame, the record of this mobile radio station of deletion from the contingency table of this initial access point, the data of alternately the replying frame that transmits a single broadcasting then is to original net territory proxy module;
Replace the source IP addresses that is write down in the return address scratch list according to original net territory proxy module, transmit the data of alternately replying frame to the first earth mat territory far away proxy module of single broadcasting from this original net territory proxy module;
Alternately reply source IP addresses in the data frame according to this, the data of alternately the replying frame to the first that transmits this single broadcasting from the first earth mat territory far away proxy module is access point far, finishes the program of request alternately.
The wireless network roaming method of a kind of cross IP domain of the present invention is characterized in that further comprising the steps of:
In the second purpose Wireless LAN of mobile radio station, provide far access point of one second earth mat territory proxy module far away and one second;
When described mobile radio station directly roams to the second purpose Wireless LAN by the first purpose Wireless LAN, after finishing the program that reconnects, second far access point inquire about the MSDS of this access point, and in this MSDS, do not find to exist the data of former Service Access Point;
By second far access point send and alternately ask data frame to the second earth mat territory far away proxy module;
At described mobile radio station during, use the IP address of the original net territory proxy module that registration form write down of the MAC Address inquiry second earth mat territory far away proxy module of this mobile radio station successfully to the login of the second earth mat territory far away proxy module;
Set up one for this mobile radio station and replace the return address scratch list in the second earth mat territory far away proxy module, alternately the return address scratch list includes the MAC Address of described mobile radio station, and this alternately asks the source IP addresses of data frame;
According to the IP address of the original net territory proxy module that is inquired in the described registration form, alternately ask the data frame to transfer to described original net territory proxy module this;
Inquire about the registration form that original net territory proxy module is safeguarded, and inquire about the IP address of a last earth mat far away territory proxy module of this mobile radio station;
Set up one for this mobile radio station and replace the return address scratch list in this original net territory proxy module, alternately the return address scratch list comprises the MAC Address of this mobile radio station, and this alternately asks the source IP addresses of data frame;
The IP address of last earth mat far away territory proxy module of the mobile radio station that is write down in the registration form according to original net territory proxy module is transmitted a single broadcasting and is alternately asked data frame to the first earth mat territory far away proxy module;
The first earth mat territory far away proxy module is inquired about its contingency table, when not having the MAC Address of this mobile radio station in contingency table, broadcasts this data frame of alternately asking in the first purpose Wireless LAN of described mobile radio station;
According to this broadcasting alternately ask the data frame, the record of the described mobile radio station of deletion from the contingency table of first access point transmits the data of alternately replying frame to the first earth mat territory far away proxy module of a single broadcasting then;
According to the alternately return address scratch list of the first earth mat territory far away proxy module, the response to query destination address is the IP address of original net territory proxy module, and the data of alternately the replying frame of this single broadcasting is transferred to this original net territory proxy module;
According to the alternately return address scratch list of this mobile radio station, the response to query destination address is the IP address of the second earth mat territory far away proxy module, and the data of alternately the replying frame of this single broadcasting is transferred to the second earth mat territory far away proxy module;
Alternately reply source IP addresses in the data frame according to this, transmit the data of alternately replying frame to the second access point of this single broadcasting, finish the program of request alternately from the second earth mat territory far away proxy module.
The wireless network roaming method of a kind of cross IP domain of the present invention is characterized in that further comprising the steps of:
When mobile radio station is directly roamed back the Wireless LAN at script place by the second purpose Wireless LAN, after finishing the program that reconnects, by second far access point inquire about the MSDS of this access point, and in this MSDS, do not find to exist the data of former Service Access Point;
Described initial access point sends one with broadcast mode alternately asks the data frame to described original net territory proxy module;
Successfully when original net territory proxy module is logined, use the IP address of the last earth mat far away territory proxy module that registration form write down of the MAC Address inquiry original net territory proxy module of described mobile radio station at described mobile radio station;
According to the IP address of a last earth mat far away territory proxy module that is inquired in the described registration form, alternately ask the data frame to transfer to a last earth mat far away territory proxy module this;
Set up one for this mobile radio station and replace the return address scratch list in this original net territory proxy module, alternately the return address scratch list comprises the MAC Address of this mobile radio station, and alternately asks the source IP addresses of data frame;
The IP address of a last earth mat far away territory proxy module of the mobile radio station that is write down in the registration form according to described original net territory proxy module, the data of alternately the replying frame that transmits a single broadcasting from described original net territory proxy module is to the described second earth mat territory far away proxy module;
The described second earth mat territory far away proxy module is inquired about its contingency table, when not having the MAC Address of mobile radio station in contingency table, broadcasts this data frame of alternately asking in the second purpose Wireless LAN of mobile radio station;
According to broadcasting alternately ask the data frame, from described second record of the described mobile radio station of deletion the contingency table of access point far away, the data of alternately the replying frame that transmits a single broadcasting then is to the described second earth mat territory far away proxy module;
The address, source of being write down in the alternately return address scratch list according to the second earth mat territory far away proxy module of described mobile radio station transfers to original net territory proxy module with the data of alternately the replying frame of single broadcasting;
According to the alternately return address scratch list of original net territory proxy module, inquire about the purpose IP address that this alternately replys the data frame, the data of alternately the replying frame that transmits this single broadcasting from this original net territory proxy module is finished alternately requestor to this initial access point.
Method of the present invention is utilized the information exchange mechanism of access point in the MAC layer of IAPP originally, and the information transmission mechanism of Mobile IP in the IP layer, makes mobile radio station can cross over different IP subnet roads and roams.When mobile radio station when the access point B on former IP subnet road roams to the access point A on another IP subnet road, just the access point A to new Wireless LAN sends the request that reconnects, access point A is for finishing ALP, must obtain the IP address of original access point B earlier, can will alternately ask to send to access point B.So, access point A is by the communication mechanism of Mobile IP at the networking layer, find the IP address of original access point B, and this original access point B is sent request alternately, then, original access point B is again by the communication mechanism of Mobile IP at the networking layer, pass the data frame of alternately replying back, so access point A just can finish ALP, make mobile radio station can cross over different IP subnet road roamings.
The present invention breaks through the restriction of existing communication mechanism, and under the prerequisite of not violating existing Mobile IP and IAPP communication need, proposes a kind of communication mechanism of linking up MAC layer and networking layer, and mobile radio station can be roved between the access point that is distributed in the different sub-network road.
Further specify technology of the present invention below in conjunction with embodiment and accompanying drawing.
Fig. 1 is a process schematic diagram of implementing the wireless network roaming method of cross IP domain of the present invention
Fig. 2 utilizes the process schematic diagram of method of the present invention when mobile radio station roams to the 3rd local-area network by the second area networking
Fig. 3 is the process flowchart of the present invention when the IAPP that receives single broadcasting alternately asks
Fig. 4 is the process flowchart of the present invention when the IAPP that receives broadcast type alternately asks
Fig. 5 is the process flowchart of the present invention when reception IAPP alternately replys
Mobile IP is to be the mobile radio station service by net territory proxy module (Agent) that is arranged in each net territory on the layer of networking in the communication mechanism on the layer of networking.Net territory proxy module can be divided into original net territory proxy module (Home Agent) and earth mat territory proxy module (Foreign Agent) far away by its function, and the both is the module of carrying out at access point.The initial net territory proxy module of registering of mobile radio station then is its original net territory proxy module, and other net territory proxy module is all its earth mat far away territory proxy module to this mobile radio station.Each net territory proxy module is all safeguarded a registration form (registration table), the content of registration form is the different and difference to some extent according to the function of net territory proxy module then, an if original net territory proxy module registration form, its will write down mobile radio station MAC Address, serve the IP address of the earth mat previous far away territory proxy module (Last Foreign Agent) of this mobile radio station, and the IP address of the earth mat far away territory proxy module (Current Foreign Agent) of the local-area network at this present place of mobile radio station.The information that earth mat territory far away proxy module registration form is write down comprises: the IP address of the original net territory proxy module of the MAC Address of mobile radio station and this mobile radio station.
When mobile radio station roams to another Wireless LAN, new net territory proxy module must be notified original net territory proxy module, to upgrade original net territory proxy module registration form, this mobile radio station last time with proxy module IP address, present residing net territory, and net in distant and set up a record (record) in the proxy module registration form of territory, the MAC Address that comprises this mobile radio station, and the IP address of the net territory proxy module (Home Agent) of the Wireless LAN at script place.
With respect to the communication mechanism of Mobile IP, IAPP in the mode of periodic broadcast, collects the information of other access point on the networking then by being positioned at each access point.When mobile radio station roam to by another access point serve regional the time, mobile radio station finds that by its received notification signal (beacon) it has roamed to the zone of being served by new access point, reconnect Request Packet (reassociationrequest) and this access point sent, and the startup ALP, at first this access point can add the information of this mobile radio station in the contingency table (association table), and inquire about access point MSDS (AP table) according to the former Service Access Point MAC Address that reconnects in the Request Packet, if exist, be that alternately Request Packet (handoff request) is sent in the destination then with obtained IP address, after receiving, then inquires about the purpose access point its contingency table (association table), if the information of this mobile radio station really therein, with its deletion and send back to and alternately reply package (handoff response).If new access point does not find in the access point MSDS of being safeguarded (AP table), need from the proxy module registration form of earth mat far away territory, to find out earlier the original net territory proxy module of this mobile radio station this moment, from the proxy module registration form of original net territory, find out the access point IP address of serving earth mat far away territory proxy module its last time again, just can send alternately request, and finish ALP it.
Referring to Fig. 1, explanation method of the present invention is to utilize the communication mechanism of Mobile IP and IAPP to realize that 10 shown in the figure, 20 is the Wireless LANs on two different IP subnet roads among the figure.Mobile radio station 19 moves to another Wireless LAN 20 from the Wireless LAN 10 at script place, originally in the Wireless LAN 10 at place initial access point a 13 (Access Point A is arranged, be AP A), and original net territory proxy module (Home Agent, be HA) 11, lay respectively on the different mobile radio stations.Initial access point 13 is responsible for the access point service of this local-area network 10 according to the communication mechanism of IAPP, and fixedly upgrades its MSDS 14 (AP table) in the period one.In the MSDS 14 essential record the MAC Address of AP A 13, and the IP address of AP A 13.
On the other hand, HA11 is then according to the communication mechanism of Mobile IP, be responsible in the registration form (registration table) 12 of data logging at an original net territory proxy module of mobile radio station 19 when roaming, essential record wherein: the MAC Address of mobile radio station 19, the IP address of the previous net territory proxy module at these mobile radio station 19 places (Last FA ' s IP address), and the IP address (Current FA ' s IP address) of the net territory proxy module at these mobile radio station 19 present places.
One access point B (Access Point B, i.e. AP B) 17 far away is arranged in second Wireless LAN 20, and an earth mat territory far away proxy module 15 (Foreign Agent FA), also lays respectively on the different mobile radio stations.The work of AP B 17 is with AP A 13, main communication mechanism according to IAPP, be responsible for the access point service of this Wireless LAN 20, and fixedly upgrade its MSDS 18 (AP table) in the period one, in the MSDS 18 essential record the MAC Address of AP B (AP B MAC address), and the IP address of AP B.
Earth mat territory proxy module (Foreign Agent far away, FA) 15 communication mechanisms according to Mobile IP, be responsible for the path of this mobile radio station 19 of record when roaming, and safeguard the registration form (regisration table) 16 of an earth mat territory far away proxy module, essential record comprises: the MAC Address of this mobile radio station (MS MACaddress), the IP address of the original net territory proxy module of mobile radio station (MS ' s HA ' s IP address).
According to this structure, when mobile radio station 19 roamed to radio area network territory 20, mobile radio station 19 just sent the request that reconnects to APB 17.When AP B 17 receives the request that reconnects (reassociation request) of mobile radio station 19, at first finish the program that reconnects (association), inquire about the MSDS (AP table) 18 of The built-in again, so that inquire about the IP address of the initial access point (AP A) 13 of this mobile radio station 19, send to initial access point 13 and alternately to ask data frame (handlff request frame), and with this alternately request be recorded in alternately in the table (handlff list).
If MSDS 18 has write down the IP address of AP A 13, just can directly send and alternately ask the data frame AP A 13, otherwise just the former Service Access Point of this mobile radio station 19 of decidable is to be positioned at different net territories with new Service Access Point, inquire about the record that whether has this mobile radio station 19 to succeed in registration in the registration form 16 of FA A 15 according to its MAC Address again, promptly, FA A 15 can set an incident that succeeds in registration (registration succeed event) when mobile radio station 19 succeeds in registration.
FA A 15 can inquire about earth mat far away territory proxy module registration form 16 according to the MAC Address of mobile radio station 19, find out the IP address of the HA11 that originally is mobile radio station 19 services, after finding the IP address of HA11, just can alternately ask the data frame to the IAPP that HA11 transmits single broadcasting (unicast), and set up a return address scratch list (proxy IAPP table) alternately, with the IP address of record AP B 17 and the MAC Address of mobile radio station 19.
HA11 receives when the IAPP of the single broadcasting that sends from FA15 alternately asks the data frame, owing to do not have the MAC Address of this mobile radio station 19 in the contingency table of HA11 access point of living in, so ask the data frame to be broadcasted away IAPP, and the MAC Address of this mobile radio station 19 and source IP addresses (the IP address of FA A 15) be based upon alternately in the return address scratch list.
After AP A 13 receives the IAPP request data frame of broadcasting, check the MAC Address whether this mobile radio station 19 is arranged in its contingency table, if have, just delete the data of this mobile radio station 19 in the contingency table, expression mobile radio station 19 has left the scope of its service, and transmits IAPP and alternately reply package (IAPP handoff response) to HA11.
HA11 checks that it replaces the MAC Address whether this mobile radio station is arranged in the return address scratch list after receiving and replying from the IAPP of the single broadcasting of AP A 13, if having, just delete this data, and transmit IAPP and reply to FA A 15.
FA A 15 receives when the IAPP from the single broadcasting of HA11 alternately replys, and replaces the data whether this mobile radio station 19 is arranged in the return address scratch list according to its MAC Address inspection, if having, alternately replies to AP B 17 just transmit IAPP, deletes this data then.
AP B 17 receives when the IAPP of single broadcasting alternately replys, checks to replace whether to have in the table and once sent the alternately record of request, if having, just finish ALP, otherwise do not do any operation.
Referring to Fig. 2, another kind of situation shown in the figure, mobile radio station 19 roams into the 3rd local-area network again by second local-area network.Three Wireless LANs 10,20,30 shown in the figure, mobile radio station 19 moves on to the 3rd Wireless LAN 30 again from second Wireless LAN 20.Except networking, first area 10 originally and the AP A 13 in the second area networking 20, HA11, outside FA A 15 and the AP B 17, the 3rd local-area network 30 has an AP C 33 and a FA B 31 equally.
When mobile radio station 19 roams to the 3rd Wireless LAN 30, just AP C 33 is sent the request that reconnects, after finishing the program that reconnects, AP C 33 just inquires about the MSDS 34 of The built-in earlier, so that find its IP address, to send alternately request to this access point according to the MAC Address of previous Service Access Point.Because the former Service Access Point of mobile radio station 19 is positioned at different net territories with new Service Access Point, so MSDS 34 do not have the IP address of previous Service Access Point, so AP C 33 inquires about the record that whether has this mobile radio station 19 to succeed in registration to FA B 31.
FA B 31 receives that the IAPP from AP C 33 broadcasting alternately asks the data frame, just can inquire about earth mat far away territory proxy module registration form 32 according to the MAC Address of mobile radio station 19, to seek the IP address of mobile radio station 19 HA11.After finding the IP address of HA11, just can transmit the IAPP request data frame of single broadcasting, simultaneously the IP address of AP C 33 and the MAC Address adding of mobile radio station 19 be replaced in the return address scratch list HA11.
HA11 checks its original net territory proxy module registration form 12 after receiving the IAPP request data frame of the single broadcasting that sends from FA B 31, before be the IP address of the FA A 15 in mobile radio station 19 second Wireless LAN 20 of serving to find.Transmit IAPP then and alternately ask the data frame, and the IP address of the MAC Address of this mobile radio station and FA B 31 is based upon alternately in the return address scratch list to FA A 15.
FA A 15 receives that the IAPP of the single broadcasting that HA11 sends alternately asks the data frame, just check its earth mat far away territory proxy module registration form 16, find that this mobile radio station is really in its service range, continue to check its contingency table then, find this mobile radio station 19 not therein this moment, just IAPP is asked the data frame to be broadcasted away, and the IP address of the MAC Address of this mobile radio station 19 and HA A11 is based upon alternately in the return address scratch list.
AP B 17 checks the MAC Address whether this mobile radio station 19 is arranged in its contingency table after receiving the IAPP request data frame of broadcasting.If have, just delete the data of this mobile radio station 19 in this contingency table, represent that this mobile radio station 19 has left the scope of its service, and transmit this IAPP to FA A 15 and alternately reply the data frame.
FA A 15 checks that it replaces the MAC Address whether this mobile radio station is arranged in the return address scratch list after receiving and replying the data frame from the IAPP of the single broadcasting of AP B 17.If have, just find the address of its HA11, transmit IAPP to HA11 and reply the data frame according to its MAC Address, delete this data then.
HA11 checks that it replaces the MAC Address whether this mobile radio station 19 is arranged in the return address scratch list after receiving and replying the data frame from the IAPP of the single broadcasting of FA A 15.If have,, reply the data frames to transmit IAPP, and delete this data to FA B 31 just find the address of its FA B 31 according to its MAC Address.
FA B 31 checks that it replaces the data whether this mobile radio station 19 is arranged in the return address scratch list after receiving and replying the data frame from the IAPP of the single broadcasting of HA11.If have, just find the IP address of AP C 33, reply the data frames to transmit IAPP to AP C 33 according to its MAC Address, delete this data then.
AP C 33 receives when the IAPP of single broadcasting replys the data frame, checks to replace whether to have in the table and once sent the alternately record of request, if having, and with this record deletion, just finish ALP, otherwise do not do any operation.
Referring to Fig. 1, the third situation is described again, i.e. the situation of mobile radio station 19 when other local-area network is got back to original Wireless LAN 10.
When mobile radio station was roamed back the Wireless LAN at original place, mobile radio station 19 was just broadcasted the request that reconnects.AP A 13 receives reconnecting when asking of mobile radio station 19, after finishing the program that reconnects, checks just whether the original net territory proxy module registration form 12 of HA11 has the record that succeeds in registration.If find, just AP A 13 inquires about the MSDS 14 of The built-in earlier, so that find its IP address, to send alternately request to this access point according to the MAC Address of previous Service Access Point.Because AP A 13 belongs to different subnet territories with AP B17, so there is not the data of AP B 17 in the MSDS 14, therefore AP A13 will send in the mode of broadcasting, and HA11 will receive this package, after the inspection contingency table finds that this mobile radio station is not to be its service object, check registration form, to find out its last earth mat far away territory proxy module FA A 15 that is served, and send IAPP to FA A 15 and replace the request data, the IP address of the MAC Address of this mobile radio station 19 and AP A 13 is based upon alternately in the return address scratch list.
After FA A 15 receives that the IAPP of the single broadcasting that HA11 transmits alternately asks, inquire about its earth mat far away territory proxy module registration form 16, the MAC Address whether mobile radio station 19 is arranged, find that this mobile radio station is really in its service range, continue to check its contingency table again, find this mobile radio station 19 not therein this moment, then the IP address of the MAC Address of this mobile radio station 19 and HA11 is based upon alternately in the return address scratch list, and ask the data frame to be broadcasted away IAPP.
AP B 17 checks the MAC Address whether this mobile radio station 19 is arranged in the contingency table after receiving the IAPP request data frame of broadcasting.If have, just delete this data, and transmit IAPP to FA A 15 and reply the data frame.
When FA A 15 receives from the IAPP answer data frame of the single broadcasting of AP B 17, check alternately in the return address scratch list whether this record is arranged, if having, just delete this data, and transmit this IAPP to HA11 and reply the data frame.
After HA11 receives that IAPP replys the data frame, check alternately return address scratch list, whether this record is arranged.If have, reply the data frame just transmit IAPP to AP A 13.
After AP A 13 receives that IAPP replys the data frame, check and whether once sent alternately request of IAPP, if the program that replaces is just finished, otherwise, do not do any operation.
Referring to Fig. 3 to Fig. 5, with flowchart text method of the present invention.After receiving the request that reconnects and finishing the program that reconnects, the request data frame that IAPP replaces just sends.The IAPP that receives single propagation shown in Fig. 3 replaces the flow process of request.Among Fig. 3:
301: the inquiry contingency table;
302: the data that this mobile radio station is arranged? if have, execution in step 303, otherwise execution in step 305;
303: when finding, just with this data deletion;
304: the data frame that IAPP is alternately replied is returned to conveyer;
305: the registration form of further inquiring about original net territory proxy module;
306: judge the data that this mobile radio station is arranged? if have, execution in step 307, otherwise, execution in step 311;
307: obtain the MAC Address of this mobile radio station, be used to inquire about the earth mat far away territory proxy module of its previous service;
308: judge and find? if find, execution in step 309, otherwise execution in step 310;
309: transmit the earth mat far away territory proxy module that this request data frame that replaces is given a last service;
310: broadcast the request data frame that this replaces;
311: the registration form of inquiring about earth mat far away territory proxy module with the MAC Address of this mobile radio station;
312: judge and find? if find, execution in step 313, otherwise, execution in step 314;
313: the data frame that receives is broadcasted away, and the IP address in the MAC Address of this mobile radio station and source is based upon alternately in the return address scratch list;
314: do not do any operation.
When the IAPP that receives broadcasting alternately asked the data frame, its flow process as shown in Figure 4.
401: the inquiry contingency table;
402: the roaming data that finds this mobile radio station? if find, execution in step 403, otherwise, execution in step 405;
403: the record of deleting this mobile radio station;
404: the answer data frame that IAPP is replaced is returned to conveyer;
405: the registration form of inquiring about earth mat far away territory proxy module;
406: judge the data that this mobile radio station is arranged? if have, execution in step 407, otherwise, execution in step 409;
407: the IAPP that transmits single broadcasting alternately replys the original net territory proxy module of data frame to this mobile radio station;
408: the IP address in the MAC Address of this mobile radio station and source is based upon alternately replys in the scratch list;
409: the registration form of inquiring about original net territory proxy module with the MAC Address of this mobile radio station;
410: judge and find? if find, execution in step 411, otherwise, execution in step 412;
411: inquire about the IP address of the earth mat far away territory proxy module of its previous service with the MAC Address of this mobile radio station, and send this data frame to this net territory proxy module;
412; Do not do any operation.
When receiving the return information that IAPP replaces, its flow process as shown in Figure 5.
501: check alternately table;
502: whether once sent request alternately? if have, execution in step 504, otherwise, execution in step 503;
503: whether judgement itself is the proxy module at networking; If, execution in step 506, otherwise, execution in step 505;
504: delete this record;
505: do not do any operation;
506: replace the return address scratch list with this MAC Address inquiry;
507: judge and find? if find, execution in step 508, otherwise, execution in step 509;
508: pass on this data frame to this proxy module;
509: do not do any operation.
In sum, method of the present invention is in conjunction with the information exchange mechanism of access point in the MAC layer of script IAPP, and the information transmission mechanism of Mobile IP in the IP layer, therefore can make mobile radio station can cross over different IP subnet roads and roam, enlarged the range of application of Wi-Fi.
Claims (14)
1. the wireless network roaming method of a cross IP domain, described Wi-Fi includes the Wireless LAN that is positioned at different IP subnet road more than, it is characterized in that may further comprise the steps:
In the Wireless LAN at mobile radio station script place, provide an original net territory proxy module and an initial access point;
In the first purpose Wireless LAN of this mobile radio station, provide far access point of one first earth mat territory proxy module and first far away;
When mobile radio station directly roams to the first purpose Wireless LAN by the Wireless LAN at script place, receive the request that reconnects data frame from this mobile radio station;
Finish reconnect after, first far access point send and alternately ask data frame to the first earth mat territory far away proxy module;
At mobile radio station during, use the I P address of the original net territory proxy module that registration form write down of the MAC Address inquiry first earth mat territory far away proxy module of this mobile radio station successfully to the login of the first earth mat territory far away proxy module;
Set up one for this mobile radio station and replace the return address scratch list in the first earth mat territory far away proxy module, alternately the return address scratch list comprises the MAC Address of this mobile radio station, and this alternately asks the source IP addresses of data frame;
According to the IP address of the original net territory proxy module that from this registration form, is inquired, alternately ask the data frame to transfer to this original net territory proxy module this;
Inquire about the registration form that this original net territory proxy module is safeguarded, find out the IP address of last earth mat far away territory proxy module of this mobile radio station, when having the data of earth mat far away territory proxy module, then will alternately ask the data frame to transfer to this earth mat far away territory proxy module, when not having the data of earth mat far away territory proxy module, judge that a net territory proxy module is original net territory proxy module on this mobile radio station;
The inquiry contingency table when not having the MAC Address of this mobile radio station in contingency table, is broadcasted this data frame of alternately asking in the Wireless LAN at this mobile radio station script place;
According to this broadcasting alternately ask the data frame, the record of this mobile radio station of deletion from the contingency table of this initial access point, the data of alternately the replying frame that transmits a single broadcasting then is to original net territory proxy module;
Replace the source IP addresses that is write down in the return address scratch list according to original net territory proxy module, transmit the data of alternately replying frame to the first earth mat territory far away proxy module of single broadcasting from this original net territory proxy module;
Alternately reply source IP addresses in the data frame according to this, the data of alternately the replying frame to the first that transmits this single broadcasting from the first earth mat territory far away proxy module is access point far, finishes the program of request alternately.
2. the wireless network roaming method of a kind of cross IP domain according to claim 1 is characterized in that further comprising the steps of:
In the second purpose Wireless LAN of mobile radio station, provide far access point of one second earth mat territory proxy module far away and one second;
When described mobile radio station directly roams to the second purpose Wireless LAN by the first purpose Wireless LAN, after finishing the program that reconnects, second far access point inquire about the MSDS of this access point, and in this MSDS, do not find to exist the data of former Service Access Point;
By second far access point send and alternately ask data frame to the second earth mat territory far away proxy module;
At described mobile radio station during, use the IP address of the original net territory proxy module that registration form write down of the MAC Address inquiry second earth mat territory far away proxy module of this mobile radio station successfully to the login of the second earth mat territory far away proxy module;
Set up one for this mobile radio station and replace the return address scratch list in the second earth mat territory far away proxy module, alternately the return address scratch list includes the MAC Address of described mobile radio station, and this alternately asks the source IP addresses of data frame;
According to the IP address of the original net territory proxy module that is inquired in the described registration form, alternately ask the data frame to transfer to described original net territory proxy module this;
Inquire about the registration form that original net territory proxy module is safeguarded, and inquire about the IP address of a last earth mat far away territory proxy module of this mobile radio station;
Set up one for this mobile radio station and replace the return address scratch list in this original net territory proxy module, alternately the return address scratch list comprises the MAC Address of this mobile radio station, and this alternately asks the source IP addresses of data frame;
The IP address of last earth mat far away territory proxy module of the mobile radio station that is write down in the registration form according to original net territory proxy module is transmitted a single broadcasting and is alternately asked data frame to the first earth mat territory far away proxy module;
The first earth mat territory far away proxy module is inquired about its contingency table, when not having the MAC Address of this mobile radio station in contingency table, broadcasts this data frame of alternately asking in the first purpose Wireless LAN of described mobile radio station;
According to this broadcasting alternately ask the data frame, the record of the described mobile radio station of deletion from the contingency table of first access point transmits the data of alternately replying frame to the first earth mat territory far away proxy module of a single broadcasting then;
According to the alternately return address scratch list of the first earth mat territory far away proxy module, the response to query destination address is the IP address of original net territory proxy module, and the data of alternately the replying frame of this single broadcasting is transferred to this original net territory proxy module;
According to the alternately return address scratch list of this mobile radio station, the response to query destination address is the IP address of the second earth mat territory far away proxy module, and the data of alternately the replying frame of this single broadcasting is transferred to the second earth mat territory far away proxy module;
Alternately reply source IP addresses in the data frame according to this, transmit the data of alternately replying frame to the second access point of this single broadcasting, finish the program of request alternately from the second earth mat territory far away proxy module.
3. the wireless network roaming method of a kind of cross IP domain according to claim 1 is characterized in that further comprising the steps of:
When mobile radio station is directly roamed back the Wireless LAN at script place by the second purpose Wireless LAN, after finishing the program that reconnects, by second far access point inquire about the MSDS of this access point, and in this MSDS, do not find to exist the data of former Service Access Point;
Described initial access point sends one with broadcast mode alternately asks the data frame to described original net territory proxy module;
Successfully when original net territory proxy module is logined, use the IP address of the last earth mat far away territory proxy module that registration form write down of the MAC Address inquiry original net territory proxy module of described mobile radio station at described mobile radio station;
According to the IP address of a last earth mat far away territory proxy module that is inquired in the described registration form, alternately ask the data frame to transfer to a last earth mat far away territory proxy module this;
Set up one for this mobile radio station and replace the return address scratch list in this original net territory proxy module, alternately the return address scratch list comprises the MAC Address of this mobile radio station, and alternately asks the source IP addresses of data frame;
The IP address of a last earth mat far away territory proxy module of the mobile radio station that is write down in the registration form according to described original net territory proxy module, the data of alternately the replying frame that transmits a single broadcasting from described original net territory proxy module is to the described second earth mat territory far away proxy module;
The described second earth mat territory far away proxy module is inquired about its contingency table, when not having the MAC Address of mobile radio station in contingency table, broadcasts this data frame of alternately asking in the second purpose Wireless LAN of mobile radio station;
According to broadcasting alternately ask the data frame, from described second record of the described mobile radio station of deletion the contingency table of access point far away, the data of alternately the replying frame that transmits a single broadcasting then is to the described second earth mat territory far away proxy module;
The address, source of being write down in the alternately return address scratch list according to the second earth mat territory far away proxy module of described mobile radio station transfers to original net territory proxy module with the data of alternately the replying frame of single broadcasting;
According to the alternately return address scratch list of original net territory proxy module, inquire about the purpose IP address that this alternately replys the data frame, the data of alternately the replying frame that transmits this single broadcasting from this original net territory proxy module is finished alternately requestor to this initial access point.
4. the wireless network roaming method of a kind of cross IP domain according to claim 1 is characterized in that: described original net territory proxy module is and the communications protocol of networking layer is linked up, and described initial access point is to link up with the communications protocol of MAC layer.
5. the wireless network roaming method of a kind of cross IP domain according to claim 1, it is characterized in that: the described first earth mat territory far away proxy module is to link up with the communications protocol of networking layer, described first far access point be to link up with the communications protocol of MAC layer.
6. the wireless network roaming method of a kind of cross IP domain according to claim 2, it is characterized in that: the described second earth mat territory far away proxy module is to link up with the communications protocol of networking layer, described second far access point be to link up with the communications protocol of MAC layer.
7. the wireless network roaming method of a kind of cross IP domain according to claim 1 is characterized in that: described initial access point comprises alternately table of a MSDS, a contingency table and.
8. the wireless network roaming method of a kind of cross IP domain according to claim 1, it is characterized in that: the described first earth mat territory far away proxy module comprises a registration form, this registration form comprises the MAC Address of described mobile radio station, and corresponds to the IP address of the original net territory proxy module of described mobile radio station.
9. the wireless network roaming method of a kind of cross IP domain according to claim 1, it is characterized in that: described original net territory proxy module comprises a registration form, and this registration form comprises the IP address of earth mat far away territory proxy module of the local-area network at the MAC Address of mobile radio station, the IP address of earth mat previous far away territory proxy module of serving this mobile radio station and this present place of mobile radio station.
10. the wireless network roaming method of a kind of cross IP domain according to claim 2, it is characterized in that: the described second earth mat territory far away proxy module comprises a registration form, this registration form comprises the MAC Address of mobile radio station, and corresponds to the IP address of the original net territory proxy module of this mobile radio station.
11. the wireless network roaming method of a kind of cross IP domain according to claim 1 is characterized in that: the described original net territory proxy module and the described first earth mat territory far away proxy module operate according to mobile IP communication mechanism.
12. the wireless network roaming method of a kind of cross IP domain according to claim 2 is characterized in that: the described second earth mat territory far away proxy module operates according to mobile IP communication mechanism.
13. the wireless network roaming method of a kind of cross IP domain according to claim 1 is characterized in that: described original net territory proxy module and described first far access point is according to the running of the communication mechanism of mutual access point agreement IAPP.
14. the wireless network roaming method of a kind of cross IP domain according to claim 2 is characterized in that: described second far access point be according to the running of the communication mechanism of mutual access point agreement IAPP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99111026.9A CN1112014C (en) | 1999-07-27 | 1999-07-27 | Wireless network roaming method of cross IP domain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99111026.9A CN1112014C (en) | 1999-07-27 | 1999-07-27 | Wireless network roaming method of cross IP domain |
Publications (2)
| Publication Number | Publication Date |
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| CN1282167A CN1282167A (en) | 2001-01-31 |
| CN1112014C true CN1112014C (en) | 2003-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN99111026.9A Expired - Lifetime CN1112014C (en) | 1999-07-27 | 1999-07-27 | Wireless network roaming method of cross IP domain |
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| CN (1) | CN1112014C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100427551B1 (en) * | 2002-05-14 | 2004-04-28 | 에스케이 텔레콤주식회사 | A roaming method between WLAN and cellular networks |
| CN1133350C (en) * | 2002-08-15 | 2003-12-31 | 西安西电捷通无线网络通信有限公司 | Method for implementing roaming of mobile terminal over IP networks by active ARP |
| US7330448B2 (en) * | 2002-08-21 | 2008-02-12 | Thomson Licensing | Technique for managing quality of services levels when interworking a wireless local area network with a wireless telephony network |
| US6950655B2 (en) * | 2002-10-01 | 2005-09-27 | Interdigital Technology Corporation | Method and system wherein handover information is broadcast in wireless local area networks |
| CN1771718A (en) * | 2003-02-10 | 2006-05-10 | 弗拉里奥恩技术公司 | Security methods for use in a wireless communications system |
| US7260082B2 (en) * | 2004-02-13 | 2007-08-21 | Yahoo! Inc. | Seamless interfacing for instant messaging and internet telephony across wireless networks |
| JP4710549B2 (en) * | 2005-10-28 | 2011-06-29 | 沖電気工業株式会社 | Access point device, communication system, access point device control method and communication control method |
| CN1968165B (en) * | 2005-11-17 | 2010-09-15 | 财团法人资讯工业策进会 | Method for connecting mobile terminal with access point quickly in WLAN |
| CN100596084C (en) * | 2006-04-20 | 2010-03-24 | 华为技术有限公司 | Method for accessing IMS network to mobile circuit domain user and its registering method |
| WO2011000152A1 (en) * | 2009-06-30 | 2011-01-06 | 上海贝尔股份有限公司 | Roaming method for mobile terminal in wireless local area network, related access controller and access point device |
| CN108076496B (en) * | 2016-11-16 | 2022-06-28 | 北京新岸线移动多媒体技术有限公司 | Method, system and device for realizing cross-cell switching in wireless network |
| CN108076495B (en) * | 2016-11-16 | 2022-03-25 | 北京新岸线移动多媒体技术有限公司 | Method, system and device for realizing cross-cell switching in wireless network |
-
1999
- 1999-07-27 CN CN99111026.9A patent/CN1112014C/en not_active Expired - Lifetime
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| CN1282167A (en) | 2001-01-31 |
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