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A delivery traffic indication message (DTIM) is a kind of TIM which informs the clients about the presence of buffered multicast or broadcast data on the access point. It is generated within the periodic beacon at a frequency specified by the DTIM interval. Beacons are packets sent by an access point to synchronize a wireless network. Normal ...
The DTIM and beacon interval settings can be adjusted to improve multicast performance in wireless networks. [8] Unlike Ethernet, most traffic in 802.11 is sent reliably using ACKs and NACKs so that radio interference does not cause unbearably high packet loss.
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).
IEEE 802.11h-2003, or simply 802.11h, refers to a 2003 amendment added to the IEEE 802.11 standard for Spectrum and Transmit Power Management Extensions. It addresses problems like interference with satellites and radar using the same 5 GHz frequency band. [1]
Frame aggregation is a feature that allows communicating on a shared link or channel, typically a TDM shared channel, with a minimum time slot that for efficiency reasons benefits from filling the time slot with data, i.e. sending two or more data frames in a single transmission.
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Frame bursting may increase the throughput of any (point-to-point) 802.11a, b, g or n link connection under certain conditions. This is done by reducing the overhead associated with the wireless session in either of the following two modes: Access point to client and vice versa; Client to client in ad hoc mode
Specially shaped directional antennas can increase the range of a Wi-Fi transmission without a drastic increase in transmission power. High gain antenna may be of many designs, but all allow transmitting a narrow signal beam over greater distance than a non-directional antenna, often nulling out nearby interference sources.