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Since beacon frames are sent using the mandatory 802.11 algorithm for carrier-sense multiple access with collision avoidance (CSMA/CA), the access point must wait if a client device is sending a frame when the beacon is to be sent. As a result, the actual time between beacons may be longer than the beacon interval.
Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (intra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon. Each station maintains a TSF timer counting in increments of microseconds (μs).
802.11 Beacon frame. A beacon frame is a type of management frame in IEEE 802.11 WLANs. It contains information about the network. Beacon frames are transmitted periodically; they serve to announce the presence of a wireless LAN and to provide a timing signal to synchronise communications with the devices using the network (the members of a service set).
AIFS is a time interval between frames being transmitted under the IEEE 802.11e EDCA MAC. It depends on the Access Category and generally depends on the AIFSN, or AIFS-number. AIFS is defined by the formula AIFSN[AC] * ST + SIFS, where the AIFSN depends on the Access Category.
Apple's recommended setting of 100 ms advertising interval with a coin cell battery provides for 1–3 months of life, which increases to 2–3 years as advertising interval is increased to 900 ms. [9] Battery consumption of the phones is a factor that must be taken into account when deploying beacon enabled apps.
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Apple's recommended setting of 100 ms advertising interval with a coin cell battery provides for 1–3 months of life, which increases to 2–3 years as advertising interval is increased to 900 ms. [18] Battery consumption of the phones is a factor that must be taken into account when deploying beacon-enabled apps.
Telematics car insurance programs offer discounts up to 40% for letting insurers monitor your driving habits through a plug-in device or smartphone app, but the savings come with important privacy ...