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• Management overhead: WiFi networks carry a significant amount of management
overhead. APs advertise their presence and wireless clients must regularly probe the AP to
notify it that they are still there. When there are a large number of WiFi devices present in a
single location, the management overhead becomes excessive and the capacity of the WiFi
network is reduced.
• Acknowledgments: All WiFi packets must be acknowledged by the receiver to ensure
successful delivery. These acknowledgment packets are sent by a WiFi device every time it
receives a packet. When combined with the overhead of protocols like TCP, this can result
in 3 out of every 4 WiFi packets becoming overhead packets, with only 1 out of 4 packets
containing “useful” data.
• Retransmissions: Not all WiFi packets are successfully received the first time they are
sent. A client might not receive a packet because of collisions or insufficient signal strength.
A single bit error in a packet will result in the retransmission of the entire WiFi packet.
Retransmissions might happen repeatedly for the same WiFi packet.
• WiFi is half duplex: A wired Ethernet network is full duplex, meaning that a device can
send and receive, or upload and download, simultaneously. WiFi is half duplex, so if a client
sends data to the AP, the AP cannot send data to the same or any other client at the same
time. For two-way communication, which includes most applications used over the Internet,
such as video or voice chat, this essentially halves throughput when compared to a full-
duplex technology, including a wired Ethernet connection.
• Wireless contention: When a client wants to send data and the channel is occupied, the
client must wait, otherwise collisions will occur and the data will be corrupted. Once the
channel clears, the client must wait even longer before it can attempt to send. Similar to
trying to cross a single-lane bridge, if there are cars wanting to cross from both directions,
everyone must wait their turn and there is uncertainty about whose turn is next. If a user on
a wireless network is using large amounts of bandwidth through activities such as watching
a video on YouTube or downloading a file, it will be more difficult and take longer for another
device to send, even if it is trying to do a task that requires very little data, such as checking
email.
LiveWiFi addresses these issues using WiFi prioritization and TCP over WiFi.
WiFi prioritization
LiveWiFi awards HP Velocity traffic a higher priority than other traffic on the network. Both
endpoints mark HP Velocity traffic to prioritize packets moving in either direction. LiveWiFi
leverages the WiFi Multimedia (WMM) Standard to reduce packet wait times compared to
other traffic in the network. This results in lower latency, less jitter, and higher throughput.
HP Velocity Technology Overview
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Questo manuale è adatto anche per i modelli :
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