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Wireless Quality of Service
Wireless Quality of Service is essential for Wireless IP telephony. QoS guarantee priority of voice traffic over regular data traffic. QoS is essential for both type of IP telephony, wired and wireless.
Quality of Service is much more difficult to achieve on wireless then on wired networks. The reason for that is wireless shared medium. In this table you could compare differences in QoS for these 2 types of medium:
| QoS characteristics for wired networks | QoS characteristics for wireless networks | | User dedicated access (ethernet) | Shared access to bandwidth | | Packets marked with 802.1p, IP TOS or DSCP | Packets marked with 802.1p, IP TOS or DSCP | | QoS can be applied to upstream or downstream traffic | QoS can be applied to downstream traffic, and some devices on upstream | | Full call admission control | Limited call admission control |
802.1p provides mechanism for implementation of QoS on MAC layer (Layer 2). It is connected with VLANs (802.1q).
TOS is similar to 802.1p, but it is on Layer 3.
DSCP (Differentiated Services Code Point) use same field as TOS, but this 8 bit field is changed to have much more different markings.
If you are network professional my hot recommendation is book - Multimedia Wireless Networks: Technologies, Standards and Qos.  It describes QoS in wireless networks for wireless multimedia applications.
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