Enterprises wish to extend VoIP over wireless LANs for the convenience wireless
service brings to the mobile user throughout the building, campus, quad and warehouse, as
well as anywhere a WLAN is accessible. Residential users purchasing VoIP service for
cost savings, look to the WLAN to enable them to make their telephones cordless. The
installation of WLANs in public spaces, backed up by a ubiquitous Internet, makes the case
of VoIP over WLANs even more compelling. Users can have telephone service portability
free of any wires anywhere a WLAN is present. The new trends in the expansion of WLAN
use include consumer electronics appliances generating multi-media traffic streams from
applications such as video streaming and interactive gaming.
???All this could happen if wireless LANs could support QoS adequately in a congested
WLAN??? was typically the reaction to the above observations prior to the adoption of the
new standard for IEEE 802.11 WLANs, known as IEEE 802.11e. The new standard
enables frames from QoS-sensitive applications to be transmitted sooner than other frames,
thus minimizing latency. It also introduces new power management features that will
prolong the life of mobile devices powered by battery.
Pages:
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153