CN100508474C - Method for switching over between switch-in points moving terminal in wireless local network - Google Patents
Method for switching over between switch-in points moving terminal in wireless local network Download PDFInfo
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- CN100508474C CN100508474C CNB021108528A CN02110852A CN100508474C CN 100508474 C CN100508474 C CN 100508474C CN B021108528 A CNB021108528 A CN B021108528A CN 02110852 A CN02110852 A CN 02110852A CN 100508474 C CN100508474 C CN 100508474C
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Abstract
The method for switching accessing points (AP) includes following steps. (1) At the same time of keeping the link with the current AP, the user tests the AP signal intensity and quality to determine whether the which AP to switch to. (2) The user carries out the connection with the selected AP. (3) The ID of the user is reported to the wireless gateway. (4) The gateway looks up the user list. (5) Based on the AP address of the switching in user, the switching notice is sent to the original AP. (6) With the notice being received, the original AP sends the user's information to the new AP. (7) the gateway informs the new AP that the user is a switching in user and sends the relevant information to the new AP. (8) with the user being switched in, the new AP sends the acknowledge information to the gateway.
Description
Technical field
The present invention relates to the method that portable terminal switches in the WLAN (wireless local area network) between access point (AP).
Background technology
WLAN (wireless local area network) is utilized less radio-frequency, and (radio frequency, RF) technology is transmitted data, speech and vision signal aloft.With respect to the traditional wiring network, WLAN (wireless local area network) has installs conveniently, use flexibly, and economy and be easy to characteristics such as expansion, thereby come into one's own day by day.The terminal mobility of WLAN (wireless local area network) is it with respect to one of considerable advantage of routing network.Portable terminal wants to realize in the larger context certainly will will realize the switching between AP (access point), as shown in Figure 1 to transparent the moving of portable terminal.
Traditional AP method for switching between is: in portable terminal and AP communication period, if terminal has shifted out the coverage of AP, perhaps owing to disturb, communication quality can't guarantee, just need switch to other communication qualities AP preferably.When carrying out switching, portable terminal at first sends connection request to new AP, and to the original position that connects AP (former AP) of new AP notice.Notify former AP to disconnect and being connected of this portable terminal by new AP, and obtain status of mobile terminal information from former AP.
The tradition changing method adopts the switching construction of distributed equity, and all information interactions and control are all cooperated by two AP to be finished.Therefore the Processing tasks of AP is relatively complicated.And, if mistake occurs in the conventional method handoff procedure, being not easy to recover original state automatically, fault-tolerant ability is not strong.
Because all information that can memory mobile terminal on the AP, such as user quality demand (Qos) information, therefore, traditional changing method is difficult to realize guaranteeing the switching of Qos.
Traditional changing method is provided the positional information of former AP by portable terminal.And in some cases, the information that portable terminal provides is also incorrect.When switching between two AP fast such as the family, this situation often takes place.If this information provides mistake, can cause handoff failure.
In addition, traditional changing method notifies former AP to disconnect connection by new AP, and obtains status of mobile terminal information, and this can produce potential safety hazard.The assailant of malice can palm off AP, obtains the portable terminal sensitive information.
Summary of the invention
The objective of the invention is in order to overcome the method that portable terminal in the existing WLAN (wireless local area network) switches, and provide a kind ofly have centralized control structure, handoff procedure by the method for switching between portable terminal AP in radio network gateway or special-purpose switching controls server centered WLAN (wireless local area network) control, new.
The object of the present invention is achieved like this: the method that portable terminal switches between access point in a kind of WLAN (wireless local area network), it is characterized in that, and may further comprise the steps:
1) portable terminal is when keeping and the current access point is connected, and which new access point the signal strength signal intensity and the quality of other access points of measurement determine whether to switch and switch to by the user according to measured value then earlier;
2) portable terminal communicates with the new access point of selecting and is connected;
3) after portable terminal and new access point established a communications link, access point reported radio network gateway with mobile terminal identification;
4) radio network gateway is searched and is inserted the portable terminal tabulation, obtains the address of the former access point of this portable terminal;
5) radio network gateway sends switching notice according to the access point address of storage in the tabulation to former access point, comprises the address of mobile terminal identification and new access point in this switching notice;
6) data cached, state information with this portable terminal after former access point has notice directly are sent to new access point;
7) this portable terminal of radio network gateway notice new access point is the switching portable terminal simultaneously, and the relevant information of this portable terminal is sent to this new access point;
8) after new access point has notice, insert this portable terminal; After new access point is judged handover success, send out confirmation to radio network gateway;
9) radio network gateway is received after the handover success acknowledge message, upgrades the access point address of inserting in the portable terminal tabulation, notifies former access point to delete this status information of mobile terminal.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network), wherein, in the described access point handoff procedure, the recipient of information can confirm the interactive information of receiving, after affirmation, begins next step action again; If acknowledge message is overtime, then return to original state.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network), wherein, the described former access point of step 6) transmits data cached, the state information of this portable terminal and can be transmitted by radio network gateway.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network), wherein, the state information described in the step 6) comprises encryption key.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network), wherein, the relevant information described in the step 7) comprises portable terminal quality requirement information.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network), wherein, the step 7) radio network gateway can issue the control message when relevant information of this portable terminal is sent to new access point, the control switching equipment is revised routing iinformation, and the business datum that sends to this portable terminal is switched on the new access point.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network) wherein, for the access control success, is destination address with the mobile terminal address by radio network gateway, sends out test packet.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network), wherein, the judgement described in the step 8) switches whether successful method is: send test packet by radio network gateway, access point then can be confirmed handover success after receiving test packet.
The method that portable terminal switches between access point in the above-mentioned WLAN (wireless local area network), wherein, described radio network gateway can authenticate former access point and new access point, and interactive information is encrypted.
Because the present invention has adopted above technical scheme, part control and interactive task are finished by server, therefore, with respect to traditional changing method, the Processing tasks of AP (access point) is simple relatively.And this structure fault-tolerant ability is stronger relatively, even mistake occurs, also can be easy to return to form.Simultaneously, this method can realize guaranteeing that Qos switches, and can authenticate the AP identity, prevents to palm off the attack of AP.Simultaneously, handover measurement and judgement are all finished by the user, have reduced the Processing tasks of AP, have reduced the AP complexity.
Description of drawings
Specific performance feature of the present invention is further described by following embodiment and accompanying drawing thereof.
Fig. 1 is the structural representation that the prior art portable terminal switches between two AP.
Fig. 2 is handover information interaction diagrams of the present invention.
Embodiment
The method that mobile terminal of wireless local area network of the present invention switches between access point may further comprise the steps:
1) portable terminal is when keeping and the current access point is connected, and which access point the signal strength signal intensity and the quality of other access points of measurement determine whether to switch and switch to by the user according to measured value then earlier;
2) portable terminal is connected with the access point of selecting;
3) with after access point connects, access point reports radio network gateway with mobile terminal identification;
4) radio network gateway is searched and is inserted the portable terminal tabulation, obtains the address of the former access point of this portable terminal;
5) radio network gateway sends switching notice according to the access point address of inserting storage in the portable terminal tabulation to former access point;
6) data cached, state information with this portable terminal after former access point has notice directly are sent to new access point;
7) this portable terminal of radio network gateway notice new access point is the switching portable terminal simultaneously, and the relevant information of this portable terminal is sent to this new access point.
8) after new access point has notice, insert this portable terminal; After new access point is judged handover success, send out confirmation to radio network gateway;
9) radio network gateway is received after the handover success acknowledge message, upgrades the access point address of inserting in the portable terminal tabulation, notifies former access point to delete this status information of mobile terminal.
In above process, interactive information can have corresponding confirmation.Only receive acknowledge message, just begin next step.If acknowledge message is overtime, then return to original state.Simultaneously, in order to guarantee safety, radio network gateway can authenticate former AP and new AP, and interactive information is encrypted.
The present invention needs AP to cooperate with radio network gateway or special-purpose switching controls server to finish.Whole handoff procedure is controlled by radio network gateway.Whenever new portable terminal and AP connect, after access authentication, radio network gateway is this mobile terminal identification, as the place terminal address and connect the AP address and relevant information deposits in and inserts the portable terminal tabulation.Relevant information comprises some required information of maintenance mobile terminal service continuity, such as Qos information.After portable terminal rolled off the production line, these information were just deleted.The user is keeping measuring signal strength signal intensity and the quality of other AP with when current AP is connected.Determine whether to switch and switch to which AP by the user according to measured value.The user switches to new AP, and when connecting with new AP, AP at first reports radio network gateway with this mobile terminal identification, searches the address that obtains the former access point of this portable terminal by radio network gateway in inserting the portable terminal tabulation; According to inserting canned data in the portable terminal tabulation, send switching notice by radio network gateway to former AP.In the switching notice, comprise the address of mobile terminal identification and new AP.After former AP receives switching notice, the business datum that belongs to this portable terminal of buffer memory is sent to new AP.For keeping professional continuity, former AP also should send the encryption key and other the state information of this portable terminal to new AP.These information can directly send to new AP, also can transmit by radio network gateway.Finish after these operations, former AP still keeps this status of mobile terminal information.Radio network gateway then sends the switching controls message to subordinate's switching equipment, and the control switching equipment is revised routing iinformation, the business datum that sends to this portable terminal is switched to new AP go up.Radio network gateway is notified new AP simultaneously, allows this portable terminal to insert and need not this mobile terminal authentication, and will insert the mobile terminal relevant information of portable terminal in tabulating and be handed down to new AP.New AP finishes after the switching, and radio network gateway upgrades the information that inserts this portable terminal in the portable terminal tabulation, and notifies former AP to disconnect and being connected of this portable terminal, and state information is deleted.Former AP kept this status of mobile terminal information always before handover success, can guarantee if handoff failure can recover original state, thereby avoid loss of state.And radio network gateway also is for same consideration in the tabulation of the later just renewal of handover success access portable terminal.
When portable terminal initiatively rolled off the production line, AP needn't keep this status information of mobile terminal, and the notice radio network gateway should be deleted the relevant information of this portable terminal immediately from tabulation.If but be connected disconnection between portable terminal and the AP, and and initiatively do not roll off the production line, might be that portable terminal shifts out coverage and causes.Therefore, AP should be in the certain hour scope, and the business datum of this portable terminal of buffer memory is hold mode information simultaneously, so that finish handover operation.
The present invention is further described in more detail below in conjunction with accompanying drawing 2 and specific embodiment.
If after the portable terminal MT1 of portable terminal A and AP1 connected, radio network gateway AS identified this portable terminal with MAC Address Uaddress1, and the address Aaddress1 of storage AP1.Portable terminal is keeping measuring signal strength signal intensity and the quality of other AP with when AP1 is connected.The signal quality of finding AP2 is better, and decision switches to AP2.The user sends connection request (message 1) to AP2.AP2 reports MT1 address Uaddress1 (message 2), after AS receives this information, sends switching notice (message 3) to AP1.AP1 then sends the data cached and state information (message 6) of MT1 to AP2.AS issues routing forwarding simultaneously and upgrades control message (message 4), and notice AP2MT1 is for switching portable terminal (message 5).AP2 inserts MT1, receives after the test packet of AS, replys handover success information (message 7).AS receives after this message, the address Aaddress2 of storage AP2, and notice AP1 deletion MT1 state information (message 8).
Advantage of the present invention is obvious:
1) because the control of switching is finished by radio network gateway, the AP Processing tasks is relatively simple, reduces cost;
2) radio network gateway bank switching status data, even mistake appears in handoff procedure, system can recover simply To original state, fault-tolerant ability is strong;
3) radio network gateway memory mobile terminal Qos data, and in handoff procedure, be issued to new AP, can be real Now guarantee the switching of Qos;
When 4) switching, the address information of former AP be can't help portable terminal to be provided, and is provided by radio network gateway, has avoided Portable terminal provides error message and the handoff failure that causes;
5) radio network gateway can authenticate AP, has guaranteed the safety of handoff procedure.
6) handover measurement and judgement have the user to finish, and have reduced the workload of AP, have reduced the complexity of AP.
When 4) switching, the address information of former AP be can't help portable terminal to be provided, and is provided by radio network gateway, avoids Portable terminal provide error message and the handoff failure that causes;
5) radio network gateway can authenticate AP, has guaranteed the safety of handoff procedure.
6) handover measurement and judgement have portable terminal to finish, and have reduced the workload of AP, have reduced answering of AP Assorted degree.
Claims (9)
1, the method that portable terminal switches between access point in a kind of WLAN (wireless local area network) is characterized in that, may further comprise the steps:
1) portable terminal is when keeping and the current access point is connected, and which new access point the signal strength signal intensity and the quality of other access points of measurement determine whether to switch and switch to by portable terminal according to measured value then earlier;
2) portable terminal communicates with the new access point of selecting and is connected;
3) after portable terminal and new access point established a communications link, new access point reported radio network gateway with mobile terminal identification;
4) radio network gateway is searched and is inserted the portable terminal tabulation, obtains the address of the former access point of this portable terminal;
5) radio network gateway sends switching notice according to the access point address of storage in the tabulation to former access point, comprises the address of mobile terminal identification and new access point in this switching notice;
6) data cached, state information with this portable terminal after former access point has notice directly are sent to new access point;
7) this portable terminal of radio network gateway notice new access point is the switching portable terminal simultaneously, and the relevant information of this portable terminal is sent to this new access point;
8) after new access point has notice, insert this portable terminal; After new access point is judged handover success, send out confirmation to radio network gateway;
9) radio network gateway is received after the handover success acknowledge message, upgrades the access point address of inserting in the portable terminal tabulation, notifies former access point to delete this status information of mobile terminal.
2, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 1, it is characterized in that in the described access point handoff procedure, the recipient of information can confirm the interactive information of receiving, after affirmation, begin next step action again; If acknowledge message is overtime, then return to original state.
3, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 1 is characterized in that, the described former access point of step 6) transmits data cached, the state information of this portable terminal and can be transmitted by radio network gateway.
4, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 1 is characterized in that, the state information described in the step 6) comprises encryption key.
5, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 1 is characterized in that, the relevant information described in the step 7) comprises portable terminal quality requirement information.
6, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 1, it is characterized in that, the step 7) radio network gateway can issue the control message when relevant information of this portable terminal is sent to new access point, the control switching equipment is revised routing iinformation, and the business datum that sends to this portable terminal is switched on the new access point.
7, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 6 is characterized in that, for the access control success, is that destination address is sent out test packet with the mobile terminal address by radio network gateway.
8, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 1, it is characterized in that, judgement described in the step 8) switches whether successful method is: send test packet by radio network gateway, access point then can be confirmed handover success after receiving test packet.
9, the method that portable terminal switches between access point in the WLAN (wireless local area network) according to claim 1 is characterized in that, described radio network gateway can authenticate former access point and new access point, and interactive information is encrypted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021108528A CN100508474C (en) | 2002-02-10 | 2002-02-10 | Method for switching over between switch-in points moving terminal in wireless local network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB021108528A CN100508474C (en) | 2002-02-10 | 2002-02-10 | Method for switching over between switch-in points moving terminal in wireless local network |
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| CN1438789A CN1438789A (en) | 2003-08-27 |
| CN100508474C true CN100508474C (en) | 2009-07-01 |
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| CNB021108528A Expired - Fee Related CN100508474C (en) | 2002-02-10 | 2002-02-10 | Method for switching over between switch-in points moving terminal in wireless local network |
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| US7813733B2 (en) * | 2004-07-27 | 2010-10-12 | Lenovo (Singapore) Pte. Ltd. | Forced roaming to avoid interference |
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| CN101374116B (en) * | 2007-08-23 | 2011-05-18 | 华为技术有限公司 | Method and apparatus for implementing on-line business |
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| CN101472306B (en) * | 2007-12-29 | 2012-06-20 | 华为技术有限公司 | Method, system and device for switching between APs |
| CN101730171B (en) * | 2009-05-27 | 2013-01-16 | 中兴通讯股份有限公司 | Switching control method and switching control system |
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