VLAN, QoS, and Proxy Mobile IP
Quality of Service (QoS) feature

Time critical data traffic such as voice and video benefit from Quality of Service (QoS), which can be configured to give voice and video higher priority. This allows for smooth voice communication, jitter free video, and reliable delivery of E-Mail configured with a lower priority .

Cisco uses the same Class of Service (CoS) used on Cisco Routers. At this time Cisco can only support downstream (Access Point to Client) QoS. When 802.11e QoS becomes ratified, Cisco will also support upstream (Client to Access Point) QoS as well by simply upgrading the firmware.

Class of Service (CoS) uses the 802.1P standard to set the priority field to network traffic. There are eight different types of CoS traffic values that can be assigned different network traffic .

802.11e is supplementary to the MAC layer to provide QoS support for LAN applications. It will apply to 802.11 physical standards a, b, and g. The purpose is to provide classes of service with managed levels of QoS for data, voice, and video applications.

802.11e has two components:

  1. Enhanced Distributed Coordination Function (eDCF) which is responsible for prioritization.
  2. Transmission Opportunity (TXOP) which is responsible for transmission control.