CN102917424A - AP (application process) switching method used in WiFi (wireless fidelity) communication - Google Patents
AP (application process) switching method used in WiFi (wireless fidelity) communication Download PDFInfo
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- CN102917424A CN102917424A CN2012104121519A CN201210412151A CN102917424A CN 102917424 A CN102917424 A CN 102917424A CN 2012104121519 A CN2012104121519 A CN 2012104121519A CN 201210412151 A CN201210412151 A CN 201210412151A CN 102917424 A CN102917424 A CN 102917424A
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Abstract
The invention discloses an AP (application process) switching method used in WiFi (wireless fidelity) communication, and provides a WiFi access point switching method for dynamically adjusting threshold values in real time. The AP switching method is characterized in that after a mobile terminal detects received signal intensity of a currently connected AP, the signal intensity is compared to a scanning threshold value, scanning is started if the signal intensity is lower than the scanning threshold value, and scanned adjacent AP information is dynamically stored; the mobile terminal continues detecting received signal intensity of the currently connected AP, the signal intensity is compared to a switching threshold value, AP switching is realized if the signal intensity is lower than the switching threshold value, and a switching object is an AP access point with the highest stored signal intensity; and the scanning threshold value and the switching threshold value are adjusted simultaneously. By the AP switching method, the mobile terminal can be quickly switched to the optimal AP when moving within a coverage area of a WiFi network, and satisfactory access service and communication effect are obtained.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of WiFi access point switching method of real-time dynamic adjusted threshold value.
Background technology
In WiFi communication, portable terminal (STA) is realized the access of Internet by access point AP, because the limited coverage area of an AP access point, usually only has 50-300m, support to terminal mobility is very limited, therefore need between different AP, carry out fast and switch, switch the network break period that causes to reduce between AP, switch and mainly be divided into three phases: find AP(probe) stage, authentication (Authenticate) stage and reconnect (Re-Associate) stage, finding the AP stage, mobile device must obtain first the relevant information of available AP by scanning (scan) mechanism, common scan mode has active scan and drive sweep, active scan is exactly that portable terminal (STA) initiatively sends a probe requests thereby, near AP can return a probe response to report existing and service parameter of it when receiving this request, but when network was busy, probe requests thereby may be lost, and initiatively sending detection packet simultaneously can bear by further emphasis network; Drive sweep is exactly that portable terminal (STA) removes to accept the beacon that AP sends, and drive sweep requires portable terminal (STA) to intercept until receive beacon always, but the reliable scanning of drive sweep is too slow.In authentication phase, exchange authentication information between portable terminal and the AP only has the website by authentication just can use Internet resources, reconnecting the stage, portable terminal sends the request of connecting to AP, if AP receives connection request, will make connection response to terminal, connect and set up.Result of study shows, switching delay derives from sweep phase between AP more than 90%, and the delay of dwindling sweep phase can reduce switching delay between AP significantly, and then reduces between AP and switch the network break period that brings.
What traditional WiFi network AP access point switching was followed is the thought of " the first company of having no progeny ", be that current quality of connection is when becoming unacceptable, portable terminal (STA) just can then try to connect other AP, portable terminal (STA) can't be prepared for possible switching in proper communication, so it is known nothing for AP resource on every side, it just must at first search for available AP on every side when switching so, and this scanning process is consuming time huge.
Summary of the invention
Portable terminal the invention provides a kind of WiFi access point switching method of real-time dynamic adjusted threshold value, so that can switch on the optimum AP when moving fast in the WiFi network's coverage area.
The technical solution adopted in the present invention is: a kind of WiFi access point switching method of real-time dynamic adjusted threshold value, detected the AP received signal strength of current connection by portable terminal, afterwards this signal strength signal intensity and sweep gate limit value are compared, if be lower than the sweep gate limit value, begin scanning, the AP information of closing on that scans is carried out dynamic memory, continue to detect the AP received signal strength of current connection, and this signal strength signal intensity and the comparison of handoff threshold value, if be lower than the handoff threshold value, finish AP and switch, switch the strongest AP access point of signal strength signal intensity of Object Selection storage, adjust simultaneously sweep gate limit value and handoff threshold value.
As the preferred embodiments of the present invention, described scan mode is visited scanning for smelling;
As the preferred embodiments of the present invention, the value of described handoff threshold can dynamically be adjusted in real time, is in AP signal strength signal intensity (RSSI) tabulation of mobile terminal stores, weeds out the faint especially AP of signal strength signal intensity, and the signal strength signal intensity average of calculating residue AP obtains;
As the preferred embodiments of the present invention, the faint especially AP of the described signal strength signal intensity that weeds out refers to that signal strength signal intensity is less than the AP of-90dbm;
As the preferred embodiments of the present invention, the value of described scanning thresholding is made as-50dbm first, and the afterwards variation according to the handoff threshold value changes, and value is that the handoff threshold value adds 10dbm.
The method that AP switches in the WiFi communication of the present invention has the following advantages at least: 1. the present invention uses and smells the spy scan mode, scans simultaneously in the process of normal connection and transmission, has significantly improved the efficient of AP scanning; 2. the value of handoff threshold of the present invention can dynamically be adjusted in real time, and this handoff threshold value has represented the mean level of AP signal strength signal intensity in the current environment, makes handover decisions more reliable, has avoided the generation of frequent switching; 3. switch to fast on the optimum AP when the present invention can make portable terminal move in the WiFi network's coverage area, obtain satisfied access service and communication efficiency.
Description of drawings
Fig. 1 is an application scenarios schematic diagram of WiFi communication in the embodiment of the invention
Fig. 2 is the changing method flow chart of AP access point in the embodiment of the invention
Fig. 3 is the position view that scans thresholding and handoff threshold in the embodiment of the invention
Fig. 4 is the in real time dynamic flow chart of adjusting of handoff threshold value in the embodiment of the invention
Embodiment
As shown in Figure 1, the coverage of AP access point is limited in the WiFi network, so the portable terminal switching that will produce AP when moving between different AP.The changing method of AP access point provided by the invention as shown in Figure 2, portable terminal detects the AP received signal strength of current connection, then the current AP signal strength signal intensity and the sweep gate limit value that this are detected compare, if when this signal strength signal intensity is higher than the sweep gate limit value, directly finish behavior; When if the current AP signal strength signal intensity that detects is lower than the sweep gate limit value, the beginning scanning process, the AP information that scans is carried out dynamic memory, and these AP that scan are carried out prioritization according to signal strength signal intensity, continue to detect the AP received signal strength of current connection, and current AP signal strength signal intensity and the handoff threshold value that this detects compared, when if this signal strength signal intensity is higher than the handoff threshold value, this signal strength signal intensity sent to the sweep gate limit value compare, if when being higher than the sweep gate limit value, directly end behavior, if when being lower than the sweep gate limit value, repeat above scanning memory sequencing process, and the AP value of information in the updated stored device, until when detecting the AP signal strength signal intensity of current connection and being lower than the handoff threshold value, just start handoff procedure, switch the strongest AP access point of signal strength signal intensity of storing in the Object Selection memory, so far, handoff procedure is finished.
In switching flow figure shown in Figure 2, what scanning was selected is to smell the spy scan mode, smell and visit scanning in the situation that do not revise the efficient that communication protocol can significantly improve AP scanning, and it is passive listening, any other wireless action can be inserted at any time, so he does not have any impact to normal radio communication, adopt this scan mode that portable terminal is scanned in the normal process that connects and transmit simultaneously.Higher in order to verify the selected scan efficiency of visiting scan mode of smelling, under different scanning durations, more traditional active scan is visited the AP number that scanning can be found with smelling, test as followsly, the scanning duration is got respectively 5ms, 10ms, 20ms, 30ms, 50ms and 100ms, tests respectively 10 times under duration in each scanning, record dual mode and scan the AP number, get its mean value, list in table 1, can see that smelling the performance of visiting scanning is better than traditional active scan all the time.
The AP number that on average captures under the table 1 different scanning duration
Choose portable terminal among the present invention for the received signal strength (RSSI) of the current AP foundation as switch decision, in switching flow figure shown in Figure 2, mentioned the thresholding of two keys, scanning thresholding (Threshold
Scan) and handoff threshold (Threshold
Handoff), be higher than Threshold when receiving signal RSSI
ScanThe time, portable terminal is normally current, and also can scan according to the scheduling of user or system this moment, but scanning is not necessarily; Be lower than Threshold when receiving signal RSSI
ScanThe time, this moment, portable terminal scanned force start.And when the RSSI continuous decrease, until be lower than Threshold
HandoffBelow, when causing handover decisions to trigger, will initiate handoff procedure, provided as shown in Figure 3 the position of two critical threshold, at the A point, the signal strength weakening of AP is to threshold value, and portable terminal starts scanning process, and the scanning of this moment is with mandatory; When monitoring current AP, the relevant information of other AP around having begun to obtain; When the B point, portable terminal judges that signal strength signal intensity has continued to be faded to below the handoff threshold, will select optimum target AP to switch.
The handoff threshold value is dynamically to adjust in real time among the present invention, it adjusts flow chart as shown in Figure 4, after detection finds to smell spy scanning, read the AP signal strength signal intensity during the AP signal strength signal intensity (RSSI) of mobile terminal stores is tabulated after scanning, judge that signal strength signal intensity is whether greater than-90dbm, if less than-90dbm, illustrate that this AP signal strength signal intensity is extremely faint, then directly give up these AP, calculate the signal strength signal intensity average of residue AP, this average has represented the mean level of AP signal strength signal intensity in the current environment, this signal strength signal intensity average is assigned to handoff threshold, upgrades the handoff threshold value, this signal strength signal intensity average is added 10dbm be assigned to the scanning thresholding, upgrade the sweep gate limit value, so far finish the dynamic adjustment of handoff threshold value and sweep gate limit value.
The above only is one embodiment of the present invention, it or not whole or unique execution mode, the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading specification of the present invention is claim of the present invention and contains.
Claims (5)
1. the method that AP switched during a WiFi communicated by letter, it is characterized in that: the AP received signal strength that is detected current connection by portable terminal, afterwards this signal strength signal intensity and sweep gate limit value are compared, if be lower than the sweep gate limit value, begin scanning, the AP information of closing on that scans is carried out dynamic memory, continue to detect the AP received signal strength of current connection, and this signal strength signal intensity and the comparison of handoff threshold value, if be lower than the handoff threshold value, finish AP and switch, switch the strongest AP access point of signal strength signal intensity of Object Selection storage, adjust simultaneously sweep gate limit value and handoff threshold value.
2. the method that AP switches in the WiFi communication as claimed in claim 1 is characterized in that: described scan mode is visited scanning for smelling.
3. the method that AP switches in the WiFi communication as claimed in claim 1, it is characterized in that: the value of described handoff threshold is dynamically adjusted in real time, be in the AP signal strength list of mobile terminal stores, weed out the faint especially AP of signal strength signal intensity, the signal strength signal intensity average of calculating residue AP obtains.
4. the method that AP switches in the WiFi as claimed in claim 3 communication is characterized in that: the faint especially AP of the described signal strength signal intensity that weeds out refers to that signal strength signal intensity is less than the AP of-90dbm.
5. the method that AP switches in the WiFi communication as claimed in claim 1, it is characterized in that: the value of described scanning thresholding is made as-50dbm first, and the afterwards variation according to the handoff threshold value changes, and value is that the handoff threshold value adds 10dbm.
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