CN104618992A - AP selection method and equipment - Google Patents
AP selection method and equipment Download PDFInfo
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- CN104618992A CN104618992A CN201510020751.4A CN201510020751A CN104618992A CN 104618992 A CN104618992 A CN 104618992A CN 201510020751 A CN201510020751 A CN 201510020751A CN 104618992 A CN104618992 A CN 104618992A
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Abstract
The invention discloses an AP selection method and equipment. The AP selection method includes that an STA receives a first detection response message from each first AP which receives a detection request message broadcast by the STA, and each first detection response message comprises an RSSI of the STA measured when the corresponding first AP receives the detection request message; the STA uses the RSSI of each first AP measured when receiving the first detection response message to generate a first alternative AP list and uses the RSSI of the STA in each first detection response message to generate a second alternative AP list; the STA uses the first alternative AP list and second alternative AP list to select related APS and associates with the related APS when connecting WLAN. According to the embodiment, the failure of the message sending from the STA to the related APS is avoided, the message sending success rate is improved, and the network communication quality is improved.
Description
Technical field
The present invention relates to communication technical field, especially relate to system of selection and the equipment of a kind of AP.
Background technology
In WLAN (Wireless Local Area Networks, WLAN (wireless local area network)) system, AP (AccessPoint, access point) and STA (wireless terminal) is relatively independent.When STA first time association wlan network, STA selects an AP to associate from alternative AP list.When STA roams, STA selects an AP again to associate from new alternative AP list.In these behaviors, AP can not the behavior of control STA.
STA when selecting to carry out the AP associating/again associate from alternative AP list, STA is RSSI (the Receive Signal Strength Indicator according to AP, received signal strength indicator) carry out, this RSSI has reacted the signal quality of AP to STA.
Due to the asymmetry of wireless link, the signal of AP to the STA fine or not possibility of signal that is fine or not and STA to AP is also different.When the signal of AP to STA is fine, during the dtr signal of STA to AP, although the signal that AP sends message to STA is fine, but STA sends the signal of message and bad to AP, makes STA send message to AP failed, thus severe jamming network service.
Summary of the invention
The embodiment of the present invention provides the system of selection of a kind of AP, said method comprising the steps of:
STA receives the first detection response message from each AP receiving the probe requests thereby message that described STA broadcasts, and carries the RSSI of the described STA measured when a corresponding AP receives described probe requests thereby message in each first detection response message; Described STA utilizes the RSSI of each AP measured when self receiving each first detection response message to generate the first alternative AP list, utilizes the RSSI of the described STA carried in each first detection response message to generate the second alternative AP list;
Described STA utilizes described first alternative AP list and described second alternative AP list to select associated AP, and associates with described associated AP when connecting WLAN (wireless local area network) WLAN.
Described STA utilizes the RSSI of each AP measured when self receiving each first detection response message to generate the first alternative AP list, utilizes the RSSI of the described STA carried in each first detection response message to generate the second alternative AP list, specifically comprises:
Described STA adds described each AP to first alternative AP list, utilizes the RSSI of described each AP, according to RSSI order from big to small, is sorted by each AP in described first alternative AP list; Described STA adds described each AP to second alternative AP list, and utilizes the RSSI of the described STA carried in each first detection response message, according to RSSI order from big to small, is sorted by each AP in described second alternative AP list.
Described STA utilizes described first alternative AP list and described second alternative AP list to select associated AP, comprising:
Steps A, described STA select top n the one AP in described first alternative AP list, and select top n the one AP in described second alternative AP list; If there is an identical AP, then perform step B; If there is no an identical AP, then perform N=N+1, and continue to perform steps A, until there is an identical AP, and perform step B; Wherein, the initial value of N is 1;
Step B, described STA select an identical AP to be associated AP.
When described STA roaming switch, described method comprises further:
Described STA receives the second detection response message from each 2nd AP receiving the probe requests thereby message that described STA broadcasts again, the RSSI of the described STA measured when corresponding 2nd AP receives described probe requests thereby message is carried in each second detection response message, and the neighbor AP list of corresponding 2nd AP; Described STA utilizes the RSSI of each 2nd AP measured when self receiving each second detection response message to generate the 3rd alternative AP list, utilizes the RSSI of the described STA carried in each second detection response message to generate the 4th alternative AP list; Described STA utilizes the neighbor AP list of described 3rd alternative AP list, described 4th alternative AP list and current associated AP, selects roaming switch AP, and associates with described roaming switch AP when roaming switch.
Described STA utilizes the RSSI of each 2nd AP measured when self receiving each second detection response message to generate the 3rd alternative AP list, utilizes the RSSI of the described STA carried in each second detection response message to generate the 4th alternative AP list, specifically comprises:
Described STA adds described each 2nd AP to the 3rd alternative AP list, utilizes the RSSI of described each 2nd AP, according to RSSI order from big to small, is sorted by each 2nd AP in described 3rd alternative AP list; Described STA adds described each 2nd AP to the 4th alternative AP list, and utilizes the RSSI of the described STA carried in each second detection response message, according to RSSI order from big to small, is sorted by each 2nd AP in described 4th alternative AP list.
Described STA utilizes the neighbor AP list of described 3rd alternative AP list, described 4th alternative AP list and current associated AP, selects roaming switch AP, specifically comprises:
Step X, described STA select front M the 2nd AP in described 3rd alternative AP list, and select front M the 2nd AP in described 4th alternative AP list; If there is the 2nd identical AP, then perform step Y; If there is no the 2nd identical AP, then perform M=M+1, and continue to perform step X, until there is the 2nd identical AP, and perform step Y; Wherein, the initial value of M is 1;
Step Y, described STA judge described the 2nd identical AP whether before the neighbor AP list of described current associated AP in K position; If so, then step Z is performed; If not, then perform M=M+1, and continue to perform step X, until identical the 2nd AP is before the neighbor AP list of described current associated AP in K position, and perform step Z;
Step Z, described STA select the 2nd identical AP to be roaming switch AP;
Wherein, each neighbor AP recorded in the neighbor AP list of current associated AP, sorts according to the order of distance near to far away of each neighbor AP and current associated AP.
The embodiment of the present invention provides a kind of STA, and described STA specifically comprises:
Receiver module, for receiving the first detection response message from each first access point AP receiving the probe requests thereby message that described STA broadcasts, in each first detection response message, carry the RSSI of the described STA measured when a corresponding AP receives described probe requests thereby message;
Generation module, the RSSI of each AP measured when receiving each first detection response message for utilizing described STA generates the first alternative AP list, utilizes the RSSI of the described STA carried in each first detection response message to generate the second alternative AP list;
Selecting module, for utilizing described first alternative AP list and described second alternative AP list to select associated AP, and associating with described associated AP when connecting WLAN (wireless local area network) WLAN.
Described generation module, specifically for adding described each AP to first alternative AP list, utilizes the RSSI of described each AP, according to RSSI order from big to small, is sorted by each AP in described first alternative AP list; Add described each AP to second alternative AP list, and utilize the RSSI of the described STA carried in each first detection response message, according to RSSI order from big to small, each AP in described second alternative AP list is sorted.
Described selection module, specifically for when utilizing described first alternative AP list and described second alternative AP list to select associated AP, performs following steps:
Steps A, top n the one AP selected in described first alternative AP list, and select top n the one AP in described second alternative AP list; If there is an identical AP, then perform step B; If there is no an identical AP, then perform N=N+1, and continue to perform steps A, until there is an identical AP, and perform step B; Wherein, the initial value of N is 1;
Step B, an identical AP is selected to be associated AP.
Described receiver module, also for when described STA roaming switch, receive the second detection response message from each 2nd AP receiving the probe requests thereby message that described STA broadcasts again, the RSSI of the described STA measured when corresponding 2nd AP receives described probe requests thereby message is carried in each second detection response message, and the neighbor AP list of corresponding 2nd AP;
Described generation module, the RSSI of each 2nd AP measured time also for utilizing described STA to receive each second detection response message generates the 3rd alternative AP list, utilizes the RSSI of the described STA carried in each second detection response message to generate the 4th alternative AP list;
Described selection module, also for utilizing the neighbor AP list of described 3rd alternative AP list, described 4th alternative AP list and current associated AP, selecting roaming switch AP, and associating with described roaming switch AP when roaming switch.
Described generation module, is further used for adding described each 2nd AP to the 3rd alternative AP list, utilizes the RSSI of described each 2nd AP, according to RSSI order from big to small, sorted by each 2nd AP in described 3rd alternative AP list; Add described each 2nd AP to the 4th alternative AP list, and utilize the RSSI of the described STA carried in each second detection response message, according to RSSI order from big to small, each 2nd AP in described 4th alternative AP list is sorted.
Described selection module, be further used at the neighbor AP list utilizing described 3rd alternative AP list, described 4th alternative AP list and current associated AP, when selecting roaming switch AP, perform following steps: step X, select individual 2nd AP of the front M in described 3rd alternative AP list, and select front M the 2nd AP in described 4th alternative AP list; If there is the 2nd identical AP, then perform step Y; If there is no the 2nd identical AP, then perform M=M+1, and continue to perform step X, until there is the 2nd identical AP, and perform step Y; Wherein, the initial value of M is 1;
Step Y, judge described the 2nd identical AP whether before the neighbor AP list of described current associated AP in K position; If so, then step Z is performed; If not, then perform M=M+1, and continue to perform step X, until identical the 2nd AP is before the neighbor AP list of described current associated AP in K position, and perform step Z;
Step Z, the 2nd identical AP is selected to be roaming switch AP;
Wherein, each neighbor AP recorded in the neighbor AP list of current associated AP, sorts according to the order of distance near to far away of each neighbor AP and current associated AP.
Based on technique scheme, in the embodiment of the present invention, STA can utilize the RSSI of RSSI and STA of an AP to select associated AP, the quality of comprehensive descision wireless link in the both direction of wireless link.For the associated AP chosen, this associated AP is better to the signal of STA, and STA is better to the signal of this associated AP, the signal making this associated AP send message to STA is better, and the signal that STA sends message to this associated AP is better, thus avoid STA to send message failure to associated AP, improve the success rate that message sends, and improve the communication quality of network.
Accompanying drawing explanation
Fig. 1 is the system of selection schematic flow sheet of a kind of AP that the embodiment of the present invention provides;
Fig. 2 is the structural representation of a kind of STA that the embodiment of the present invention provides.
Embodiment
For problems of the prior art, the embodiment of the present invention provides the system of selection of a kind of AP, is applied in the WLAN comprising STA and multiple AP.Wherein, STA needs to select the associated AP when connection WLAN in the part AP from these AP or in these AP.As shown in Figure 1, the system of selection of this AP comprises the following steps:
Step 101, STA receives the first detection response message (i.e. Probe Response message) from each AP receiving the probe requests thereby message (i.e. ProbeRequest message) that this STA broadcasts, and carries the RSSI of the STA measured when a corresponding AP receives this probe requests thereby message in each first detection response message.
Wherein, STA sends probe requests thereby message with broadcast mode, to return the first detection response message by each AP receiving this probe requests thereby message to STA, for the arbitrary AP receiving this probe requests thereby message, the RSSI that it can measure when returning and carrying and self receive this probe requests thereby message in the first detection response message to STA, in the present invention, this RSSI is referred to as the RSSI of STA, can be understood as the RSSI of STA seen by an AP.Wherein, this RSSI can be called signal strength signal intensity again, is follow-uply described for RSSI.
Step 102, STA utilizes the RSSI of each AP measured when self receiving each first detection response message to generate the first alternative AP list, utilizes the RSSI of the STA carried in each first detection response message to generate the second alternative AP list.Wherein, the RSSI of AP can be understood as the RSSI of this STA this AP seen.
In the embodiment of the present invention, based on first detection response message of a multiple AP, STA can measure the RSSI of a plurality of AP respectively.In addition, the RSSI of STA seen by a corresponding AP is all carried in first detection response message of a plurality of AP, therefore, STA can obtain the RSSI of RSSI and STA these AP seen of STA seen by these AP, namely obtains the link quality information of wireless link both direction.
In the embodiment of the present invention, the RSSI of STA can be carried in the VendorSpecific of the first detection response message (supply characteristic) cell.If STA supports technical solution of the present invention, then can obtain the RSSI of STA from VendorSpecific cell, and adopt technical solution of the present invention to process.If STA does not support technical solution of the present invention, then automatically can ignore the relevant information in Vendor Specific cell, and process according to existing procedure.
In the embodiment of the present invention, STA utilizes the RSSI of each AP measured when self receiving each first detection response message to generate the first alternative AP list, the RSSI of the STA carried in each first detection response message is utilized to generate the process of the second alternative AP list, specifically include but not limited to: STA is when interconnection network, STA adds each AP (namely sending each AP of the first detection response message to STA) to first alternative AP list, and utilize the RSSI of each AP, according to RSSI order from big to small, each AP in first alternative AP list is sorted.STA adds each AP (namely sending each AP of the first detection response message to STA) to second alternative AP list, and utilize the RSSI of the STA carried in each first detection response message, according to RSSI order from big to small, each AP in the second alternative AP list is sorted.
Such as, STA receives respectively from AP1, during the detection response message of AP2 and AP3, STA is by AP1, AP2 and AP3 adds in the first alternative AP list, afterwards, utilize the RSSI of AP1 seen by STA (RSSI measured when namely receiving the detection response message of AP1 transmission), the RSSI (RSSI measured when namely receiving the detection response message of AP2 transmission) of AP2 seen by STA, the RSSI (RSSI measured when namely receiving the detection response message of AP3 transmission) of AP3 seen by STA, according to RSSI order from big to small, by the AP1 in the first alternative AP list, AP2 and AP3 sorts, such as, after sequence, AP in first alternative AP list is AP2 successively, AP1 and AP3.
STA is by AP1, AP2 and AP3 adds in the second alternative AP list, afterwards, utilize the RSSI of STA seen by AP1 (namely from the RSSI carried in the detection response message of AP1), the RSSI (namely from the RSSI carried in the detection response message of AP2) of STA seen by AP2, the RSSI (namely from the RSSI carried in the detection response message of AP3) of STA seen by AP3, according to RSSI order from big to small, by the AP1 in the second alternative AP list, AP2 and AP3 sorts, such as, after sequence, AP in second alternative AP list is AP1 successively, AP3 and AP2.
Certainly, in actual applications, the generating mode of above-mentioned first alternative AP list and the second alternative AP list is not limited to.Such as, STA when receiving the detection response message from AP1, can record the RSSI of AP1 seen by AP1 and STA in the first alternative AP list, and records the RSSI of STA seen by AP1 and AP1 in the second alternative AP list.When receiving the detection response message from AP2, in the first alternative AP list, record the RSSI of AP2 seen by AP2 and STA, and record the RSSI of STA seen by AP2 and AP2 in the second alternative AP list.By that analogy, after the information of the AP of record institute oriented STA transmission detection response message, STA can utilize the RSSI recorded in the first alternative AP list to sort to each AP, and utilizes the RSSI recorded in the second alternative AP list to sort to each AP.In the embodiment of the present invention, the generating mode of the first alternative AP list and the second alternative AP list is repeated no longer in detail.
Step 103, STA utilizes the first alternative AP list and the second alternative AP list to select associated AP, and associates with associated AP when connecting WLAN.
In the embodiment of the present invention, STA utilizes the first alternative AP list and the second alternative AP list to select the process of associated AP, specifically can include but not limited to following steps:
Steps A, STA select top n the one AP in this first alternative AP list, and select top n the one AP in this second alternative AP list.If there is an identical AP, then perform step B; If there is no an identical AP, then perform N=N+1, and continue to perform steps A, until there is an identical AP, and perform step B; Wherein, the initial value of N is 1.
Step B, STA select an identical AP to be associated AP.
Concrete, when needs select associated AP to connect, STA selects first AP in the first alternative AP list, and selects first AP in the second alternative AP list.If there is an identical AP, then STA selects an identical AP to be associated AP.If do not have an identical AP, then STA selects the first two the one AP in the first alternative AP list, and selects the first two the one AP in the second alternative AP list.If there be identical AP, a STA to select an identical AP to be associated AP.If there is no first three AP that identical AP, a STA selects in the first alternative AP list, and select first three AP in the second alternative AP list.By that analogy, until select associated AP.
Wherein, if an identical AP has multiple, then STA is when selecting an identical AP to be associated AP, can an AP be selected as associated AP arbitrarily from a multiple identical AP, or, from a multiple identical AP, select the AP sorting the most forward in the first alternative AP list as associated AP, or, from a multiple identical AP, select the AP sorting the most forward in the second alternative AP list as associated AP.
Such as, AP2, AP1 and AP3 successively with the AP in above-mentioned first alternative AP list, AP in second alternative AP list is AP1, AP3 and AP2 is successively example, after performing the step of above-mentioned selection associated AP, can learn, STA has selected identical AP (i.e. AP1) from front two the one AP two lists, now, AP1 is defined as associated AP by STA, follow-uply associates with AP1.
Based on technique scheme, in the embodiment of the present invention, STA can utilize the RSSI of RSSI and STA of an AP to select associated AP, the quality of comprehensive descision wireless link in the both direction of wireless link.For the associated AP chosen, this associated AP is better to the signal of STA, and STA is better to the signal of this associated AP, the signal making this associated AP send message to STA is better, and the signal that STA sends message to this associated AP is better, thus avoid STA to send message failure to associated AP, improve the success rate that message sends, and improve the communication quality of network.
In the embodiment of the present invention, for the arbitrary AP receiving probe requests thereby message, it can also carry the neighbor AP list of this AP in the detection response message sent to STA.When STA selects associated AP, do not use the neighbor AP list carried in detection response message, and when STA roaming switch, STA can use the neighbor AP list carried in detection response message to select roaming switch AP, uses neighbor AP list to select the process of roaming switch AP to be described in detail below to STA.
In the embodiment of the present invention, when STA roaming switch, STA receives the second detection response message from each 2nd AP receiving the probe requests thereby message that this STA broadcasts again, the RSSI of this STA measured when corresponding 2nd AP receives probe requests thereby message is carried in each second detection response message, and the neighbor AP list of corresponding 2nd AP, the each neighbor AP recorded in the neighbor AP list of the 2nd AP, sorts according to the order of distance near to far away of each neighbor AP and the 2nd AP.Afterwards, STA utilizes the RSSI of each 2nd AP measured when self receiving each second detection response message to generate the 3rd alternative AP list, and utilizes the RSSI of the STA carried in each second detection response message to generate the 4th alternative AP list.Further, STA utilizes the neighbor AP list of the 3rd alternative AP list, the 4th alternative AP list and current associated AP, selects roaming switch AP, and associates with roaming switch AP when roaming switch.
In the embodiment of the present invention, the neighbor AP list of the 2nd AP is carried in the Vendor Specific cell of the second detection response message.If STA supports technical solution of the present invention, then from Vendor Specific cell, obtain the neighbor AP list of the 2nd AP, and adopt technical solution of the present invention to carry out the process of roaming switch.If STA does not support technical solution of the present invention, then automatically can ignore the relevant information in Vendor Specific cell, and carry out the process of roaming switch according to existing procedure.
In the embodiment of the present invention, STA utilizes the RSSI of each 2nd AP measured when self receiving each second detection response message to generate the 3rd alternative AP list, the RSSI of the STA carried in second each detection response message is utilized to generate the process of the 4th alternative AP list, specifically include but not limited to: STA adds each 2nd AP to the 3rd alternative AP list, and utilize the RSSI of each 2nd AP, according to RSSI order from big to small, each 2nd AP in the 3rd alternative AP list is sorted; STA adds each 2nd AP to the 4th alternative AP list, and utilizes the RSSI of the STA carried in each second detection response message, according to RSSI order from big to small, is sorted by each 2nd AP in the 4th alternative AP list.
Wherein, STA generates the process of the 3rd alternative AP list and the 4th alternative AP list, and the process generating the first alternative AP list and the second alternative AP list with STA is similar, and at this, it is no longer repeated.
In a kind of preferred implementation of the embodiment of the present invention, STA utilizes the neighbor AP list of the 3rd alternative AP list, the 4th alternative AP list and current associated AP, selects the process of roaming switch AP, specifically can include but not limited to following steps:
Step X, STA select front M the 2nd AP in the 3rd alternative AP list, and select front M the 2nd AP in the 4th alternative AP list; If there is the 2nd identical AP, then perform step Y; If there is no the 2nd identical AP, then perform M=M+1, and continue to perform step X, until there is the 2nd identical AP, and perform step Y; Wherein, the initial value of M is 1.
Step Y, STA judge the 2nd identical AP whether before the neighbor AP list of current associated AP in K position; If so, then step Z is performed; If not, then perform M=M+1, and continue to perform step X, until identical the 2nd AP is before the neighbor AP list of current associated AP in K position, and perform step Z.Wherein, the value of K can be arranged arbitrarily, as being set to 4.
Step Z, STA select the 2nd identical AP to be roaming switch AP.
Wherein, each neighbor AP recorded in the neighbor AP list of current associated AP, sorts according to the order of distance near to far away of each neighbor AP and current associated AP.
Concrete, when STA roaming switch, STA selects first the 2nd AP in the 3rd alternative AP list, and selects first the 2nd AP in the 4th alternative AP list.If there is the 2nd identical AP, and the 2nd identical AP is before the neighbor AP list of current associated AP in K position (usually, K<=4), then STA selects the 2nd identical AP to be roaming switch AP.Otherwise STA selects the first two the 2nd AP in the 3rd alternative AP list, and selects the first two the 2nd AP in the 4th alternative AP list.If there is the 2nd identical AP, and the 2nd identical AP is before the neighbor AP list of current associated AP in K position, then STA selects the 2nd identical AP to be roaming switch AP.Otherwise STA selects first three the 2nd AP in the 3rd alternative AP list, and select first three the 2nd AP in the 4th alternative AP list.By that analogy, until STA selects roaming switch AP.
Wherein, if roaming switch AP cannot be selected in the manner described above, namely when performing step Y, do not find the 2nd identical AP before the neighbor AP list of current associated AP in K position, then STA directly utilizes the 3rd alternative AP list and the 4th alternative AP list to select roaming switch AP, this selection course and above-mentioned STA utilize the first alternative AP list and the second alternative AP list to select the process of associated AP similar, no longer again repeat in the embodiment of the present invention to this.
Wherein, if the 2nd identical AP has multiple, STA is when selecting the 2nd identical AP to be roaming switch AP, can the 2nd AP be selected as roaming switch AP arbitrarily from multiple the 2nd identical AP, or from multiple the 2nd identical AP, select the 2nd AP sorting the most forward in the first alternative AP list as roaming switch AP, or from multiple the 2nd identical AP, select the 2nd AP sorting the most forward in the second alternative AP list as roaming switch AP.
Based on technique scheme, in the embodiment of the present invention, by carrying the neighbor AP list of the 2nd AP in the second detection response message of sending to STA at the 2nd AP, thus make STA that this neighbor AP list can be utilized to select roaming switch AP, then avoid STA when roaming switch because the fluctuation of RSSI is connected to AP at a distance, reduce and frequently switch.
Based on the inventive concept same with said method, additionally provide a kind of STA in the embodiment of the present invention, as shown in Figure 2, this STA specifically comprises:
Receiver module 11, for receiving the first detection response message from each first access point AP receiving the probe requests thereby message that described STA broadcasts, in each first detection response message, carry the RSSI of the described STA measured when a corresponding AP receives described probe requests thereby message;
Generation module 12, the RSSI of each AP measured when receiving each first detection response message for utilizing described STA generates the first alternative AP list, utilizes the RSSI of the described STA carried in each first detection response message to generate the second alternative AP list;
Selecting module 13, for utilizing described first alternative AP list and described second alternative AP list to select associated AP, and associating with described associated AP when connecting WLAN.
Described generation module 12, specifically for adding described each AP to first alternative AP list, utilizes the RSSI of described each AP, according to RSSI order from big to small, is sorted by each AP in described first alternative AP list; Add described each AP to second alternative AP list, and utilize the RSSI of the described STA carried in each first detection response message, according to RSSI order from big to small, each AP in described second alternative AP list is sorted.
Described selection module 13, specifically for when utilizing described first alternative AP list and described second alternative AP list to select associated AP, performs following steps:
Steps A, top n the one AP selected in described first alternative AP list, and select top n the one AP in described second alternative AP list; If there is an identical AP, then perform step B; If there is no an identical AP, then perform N=N+1, and continue to perform steps A, until there is an identical AP, and perform step B; Wherein, the initial value of N is 1;
Step B, an identical AP is selected to be associated AP.
Described receiver module 11, also for when described STA roaming switch, receive the second detection response message from each 2nd AP receiving the probe requests thereby message that described STA broadcasts again, the RSSI of the described STA measured when corresponding 2nd AP receives described probe requests thereby message is carried in each second detection response message, and the neighbor AP list of corresponding 2nd AP;
Described generation module 12, the RSSI of each 2nd AP measured time also for utilizing described STA to receive each second detection response message generates the 3rd alternative AP list, utilizes the RSSI of the described STA carried in each second detection response message to generate the 4th alternative AP list;
Described selection module 13, also for utilizing the neighbor AP list of described 3rd alternative AP list, described 4th alternative AP list and current associated AP, selecting roaming switch AP, and associating with described roaming switch AP when roaming switch.
Described generation module 12, is further used for adding described each 2nd AP to the 3rd alternative AP list, utilizes the RSSI of described each 2nd AP, according to RSSI order from big to small, sorted by each 2nd AP in described 3rd alternative AP list; Add described each 2nd AP to the 4th alternative AP list, and utilize the RSSI of the described STA carried in each second detection response message, according to RSSI order from big to small, each 2nd AP in described 4th alternative AP list is sorted.
In the embodiment of the present invention, described selection module 13, is further used at the neighbor AP list utilizing described 3rd alternative AP list, described 4th alternative AP list and current associated AP, when selecting roaming switch AP, performs following steps:
Step X, front M the 2nd AP selected in described 3rd alternative AP list, and select front M the 2nd AP in described 4th alternative AP list; If there is the 2nd identical AP, then perform step Y; If there is no the 2nd identical AP, then perform M=M+1, and continue to perform step X, until there is the 2nd identical AP, and perform step Y; Wherein, the initial value of M is 1;
Step Y, judge described the 2nd identical AP whether before the neighbor AP list of described current associated AP in K position; If so, then step Z is performed; If not, then perform M=M+1, and continue to perform step X, until identical the 2nd AP is before the neighbor AP list of described current associated AP in K position, and perform step Z;
Step Z, the 2nd identical AP is selected to be roaming switch AP;
Wherein, each neighbor AP recorded in the neighbor AP list of current associated AP, sorts according to the order of distance near to far away of each neighbor AP and current associated AP.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can be separated deployment.Above-mentioned module can merge into a module, also can split into multiple submodule further.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform method described in each embodiment of the present invention.It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (12)
1. a system of selection of access point AP, is characterized in that, said method comprising the steps of:
Wireless terminal STA receives the first detection response message from each AP receiving the probe requests thereby message that described STA broadcasts, and carries the received signal strength indicator RSSI of the described STA measured when a corresponding AP receives described probe requests thereby message in each first detection response message;
Described STA utilizes the RSSI of each AP measured when self receiving each first detection response message to generate the first alternative AP list, utilizes the RSSI of the described STA carried in each first detection response message to generate the second alternative AP list;
Described STA utilizes described first alternative AP list and described second alternative AP list to select associated AP, and associates with described associated AP when connecting WLAN (wireless local area network) WLAN.
2. the method for claim 1, it is characterized in that, described STA utilizes the RSSI of each AP measured when self receiving each first detection response message to generate the first alternative AP list, utilize the RSSI of the described STA carried in each first detection response message to generate the second alternative AP list, specifically comprise:
Described STA adds described each AP to first alternative AP list, utilizes the RSSI of described each AP, according to RSSI order from big to small, is sorted by each AP in described first alternative AP list;
Described STA adds described each AP to second alternative AP list, and utilizes the RSSI of the described STA carried in each first detection response message, according to RSSI order from big to small, is sorted by each AP in described second alternative AP list.
3. method as claimed in claim 2, is characterized in that, described STA utilizes described first alternative AP list and described second alternative AP list to select associated AP, comprising:
Steps A, described STA select top n the one AP in described first alternative AP list, and select top n the one AP in described second alternative AP list; If there is an identical AP, then perform step B; If there is no an identical AP, then perform N=N+1, and continue to perform steps A, until there is an identical AP, and perform step B; Wherein, the initial value of N is 1;
Step B, described STA select an identical AP to be associated AP.
4. the method as described in any one of claim 1-3, is characterized in that, when described STA roaming switch, described method comprises further:
Described STA receives the second detection response message from each 2nd AP receiving the probe requests thereby message that described STA broadcasts again, the RSSI of the described STA measured when corresponding 2nd AP receives described probe requests thereby message is carried in each second detection response message, and the neighbor AP list of corresponding 2nd AP;
Described STA utilizes the RSSI of each 2nd AP measured when self receiving each second detection response message to generate the 3rd alternative AP list, utilizes the RSSI of the described STA carried in each second detection response message to generate the 4th alternative AP list;
Described STA utilizes the neighbor AP list of described 3rd alternative AP list, described 4th alternative AP list and current associated AP, selects roaming switch AP, and associates with described roaming switch AP when roaming switch.
5. method as claimed in claim 4, it is characterized in that, described STA utilizes the RSSI of each 2nd AP measured when self receiving each second detection response message to generate the 3rd alternative AP list, utilize the RSSI of the described STA carried in each second detection response message to generate the 4th alternative AP list, specifically comprise:
Described STA adds described each 2nd AP to the 3rd alternative AP list, utilizes the RSSI of described each 2nd AP, according to RSSI order from big to small, is sorted by each 2nd AP in described 3rd alternative AP list;
Described STA adds described each 2nd AP to the 4th alternative AP list, and utilizes the RSSI of the described STA carried in each second detection response message, according to RSSI order from big to small, is sorted by each 2nd AP in described 4th alternative AP list.
6. method as claimed in claim 5, is characterized in that, described STA utilizes the neighbor AP list of described 3rd alternative AP list, described 4th alternative AP list and current associated AP, selects roaming switch AP, specifically comprises:
Step X, described STA select front M the 2nd AP in described 3rd alternative AP list, and select front M the 2nd AP in described 4th alternative AP list; If there is the 2nd identical AP, then perform step Y; If there is no the 2nd identical AP, then perform M=M+1, and continue to perform step X, until there is the 2nd identical AP, and perform step Y; Wherein, the initial value of M is 1;
Step Y, described STA judge described the 2nd identical AP whether before the neighbor AP list of described current associated AP in K position; If so, then step Z is performed; If not, then perform M=M+1, and continue to perform step X, until identical the 2nd AP is before the neighbor AP list of described current associated AP in K position, and perform step Z;
Step Z, described STA select the 2nd identical AP to be roaming switch AP;
Wherein, each neighbor AP recorded in the neighbor AP list of current associated AP, sorts according to the order of distance near to far away of each neighbor AP and current associated AP.
7. a wireless terminal STA, is characterized in that, described STA specifically comprises:
Receiver module, for receiving the first detection response message from each first access point AP receiving the probe requests thereby message that described STA broadcasts, in each first detection response message, carry the received signal strength indicator RSSI of the described STA measured when a corresponding AP receives described probe requests thereby message;
Generation module, the RSSI of each AP measured when receiving each first detection response message for utilizing described STA generates the first alternative AP list, utilizes the RSSI of the described STA carried in each first detection response message to generate the second alternative AP list;
Selecting module, for utilizing described first alternative AP list and described second alternative AP list to select associated AP, and associating with described associated AP when connecting WLAN (wireless local area network) WLAN.
8. STA as claimed in claim 7, is characterized in that,
Described generation module, specifically for adding described each AP to first alternative AP list, utilizes the RSSI of described each AP, according to RSSI order from big to small, is sorted by each AP in described first alternative AP list; Add described each AP to second alternative AP list, and utilize the RSSI of the described STA carried in each first detection response message, according to RSSI order from big to small, each AP in described second alternative AP list is sorted.
9. STA as claimed in claim 8, is characterized in that,
Described selection module, specifically for when utilizing described first alternative AP list and described second alternative AP list to select associated AP, performs following steps:
Steps A, top n the one AP selected in described first alternative AP list, and select top n the one AP in described second alternative AP list; If there is an identical AP, then perform step B; If there is no an identical AP, then perform N=N+1, and continue to perform steps A, until there is an identical AP, and perform step B; Wherein, the initial value of N is 1;
Step B, an identical AP is selected to be associated AP.
10. the STA as described in any one of claim 7-9, is characterized in that,
Described receiver module, also for when described STA roaming switch, receive the second detection response message from each 2nd AP receiving the probe requests thereby message that described STA broadcasts again, the RSSI of the described STA measured when corresponding 2nd AP receives described probe requests thereby message is carried in each second detection response message, and the neighbor AP list of corresponding 2nd AP;
Described generation module, the RSSI of each 2nd AP measured time also for utilizing described STA to receive each second detection response message generates the 3rd alternative AP list, utilizes the RSSI of the described STA carried in each second detection response message to generate the 4th alternative AP list;
Described selection module, also for utilizing the neighbor AP list of described 3rd alternative AP list, described 4th alternative AP list and current associated AP, selecting roaming switch AP, and associating with described roaming switch AP when roaming switch.
11. STA as claimed in claim 10, is characterized in that,
Described generation module, is further used for adding described each 2nd AP to the 3rd alternative AP list, utilizes the RSSI of described each 2nd AP, according to RSSI order from big to small, sorted by each 2nd AP in described 3rd alternative AP list; Add described each 2nd AP to the 4th alternative AP list, and utilize the RSSI of the described STA carried in each second detection response message, according to RSSI order from big to small, each 2nd AP in described 4th alternative AP list is sorted.
12. STA as claimed in claim 11, it is characterized in that, described selection module, be further used at the neighbor AP list utilizing described 3rd alternative AP list, described 4th alternative AP list and current associated AP, when selecting roaming switch AP, perform following steps:
Step X, front M the 2nd AP selected in described 3rd alternative AP list, and select front M the 2nd AP in described 4th alternative AP list; If there is the 2nd identical AP, then perform step Y; If there is no the 2nd identical AP, then perform M=M+1, and continue to perform step X, until there is the 2nd identical AP, and perform step Y; Wherein, the initial value of M is 1;
Step Y, judge described the 2nd identical AP whether before the neighbor AP list of described current associated AP in K position; If so, then step Z is performed; If not, then perform M=M+1, and continue to perform step X, until identical the 2nd AP is before the neighbor AP list of described current associated AP in K position, and perform step Z;
Step Z, the 2nd identical AP is selected to be roaming switch AP;
Wherein, each neighbor AP recorded in the neighbor AP list of current associated AP, sorts according to the order of distance near to far away of each neighbor AP and current associated AP.
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| CN106358174A (en) * | 2016-09-23 | 2017-01-25 | 上海众人网络安全技术有限公司 | Wireless roaming hotspot access method, system and wireless terminal |
| CN106535155A (en) * | 2016-10-14 | 2017-03-22 | 上海斐讯数据通信技术有限公司 | Method, device and system for performing wireless roaming of wireless terminal |
| CN114222351A (en) * | 2021-12-22 | 2022-03-22 | 新华三大数据技术有限公司 | AP (access point) access method, AP, client and communication system |
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