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WLAN Interworking with 2G/3G systems in .NET Creation qr barcode in .NET WLAN Interworking with 2G/3G systems




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366 WLAN Interworking with 2G/3G systems using barcode printing for visual studio .net control to generate, create qr codes image in visual studio .net applications. Code-27 RSSIFiltered = 1RSSIi - x + .NET QR Code . + xRSSIi 1[1 ( 1 + + x)]RSSIi where 1, , x are weights associated with the previous RSSI measurements; RSSI0 and RSSI-1 are set to RSSI1 upon the first measurement.

Employs a siding window based exponential averaging mechanism to filter the measured RSSI values.. Data Rate Mbps RSSI (dBm). 0 3 5 8 10 13 15 18 20 23 25 visual .net QR 28 30 33 35 36 39 40 42 44 45 47 48 49 51 52 54 55 56 58 59 60 61. Figure 17.8: Sample RSSI Plot as a user walks away from an AP. 17.3.1.

9 Time delay for subs qr barcode for .NET equent scan event A certain delay is required between two measurements to ensure that all the measurements are not done when a peak or a fast fade occurs. This is the time period the MS waits between two scan events.

Some of the possible approaches include using a fixed interval or varying it using step sizes, being more aggressive when a very strong AP is found. 17.3.

1.10 Active Set Selection The APs are ordered based on the RSSI values. A fast rising Beacon from an AP may enter the CandidateSet and be the top entry without enough hysterisis.

Additional quantities are considered in determining the ActiveSet. The thresholds for accepting a AP into the ActiveSet depends on choices made for the CandidateSet selection and the RSSI filtering process. Define NMinScansForActiveSet as the minimum number of scans for a AP to be considered for inclusion in the ActiveSet.

Some of the possible approaches are defined below.. WLAN Interworking with 2G/3G system 367 Use a single absolute RSSIAc Visual Studio .NET qr bidimensional barcode tiveSetThreshold threshold and only allow APs that have a RSSIFiltered above this threshold to be part of the ActiveSet. * The AP with the strongest RSSIFiltered is a consideration for the MS to associate itself with.

Or * The AP that has remained in the CandidateSet the longest and amongst those the AP with the strongest RSSIFiltered is a consideration for the MS associate itself with. Or * Some weighting between the two is used in determining the best ActiveSet AP - the number iterations the AP has remained in the CandidateSet and the RSSIFiltered value..

Ramping down the required th reshold based on the number of iterations the AP has remained in the CandidateSet. * RSSIInitialThreshold: The RSSI level for an AP to be included in the Active Set based on the initial scan event. * RSSIStepDownSize: The RSSI step down size that is used to reduce the current RSSI Threshold to use with each additional scan event performed in determining the Active Set subject to a lower bound of RSSIMinimumThreshold.

* RSSIMinimumThreshold: The minimum RSSI threshold that is to be used in determining the members of the Active Set. Typically RSSIIncludeThreshold RSSIMinimumThreshold RSSIInitialThreshold. Similar choices as in the previous mechanism need to be used in determining the best ActiveSet AP.

. Parameter Number of scan ite Denso QR Bar Code for .NET rations Delay between two iterations RSSIActiveSetThreshold Typical Values used for the filtering algorithm At least 10 iterations At least 5 seconds At least -85 dBm. 17.3.2 WLAN De-Selection Muc h as it is important to ensure that an AP is capable of supporting the application traffic needs when associating with it, it is equally, if not more important, to make a determination of when to disassociate certain service and potentially the MS from the AP and the WLAN system as a whole.

The MS when associated with an AP and supporting mobile-terminated services like VoIP, the MS needs to monitor the TIM bits when in power save mode or provide a transmit opportunity to the AP to send any queued up data when the EDCA/HCCA modes of 802.11e are enabled. This allows the AP to send the incoming page (e.

g., SIP Invite message) to the MS, triggering the MS to go into active traffic in supporting a VoIP call. The MS periodically monitors the beacons to measure the RSSI filters the values and determines if the currently associated AP is still suitable for supporting the best-effort and QoS applications.

It also constantly monitors other APs with the same System ID and moves to a new AP when the current AP starts to under perform and the RSSI of the new AP with the same System ID goes above the active set threshold. When the current AP starts to under-perform and there are no APs with the same System ID to move to, the MS.
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