The multimedia applications require the network to provide a trustworthy
service suitable to meet their Quality of Service and real-time requirements,
managing efficiently the available resources. In this paper we present a performing
solution for the multimedia support over IEEE 802.11e networks that aims to
combine both its Medium Access Control functions, Enhanced Distributed Channel
Access (EDCA) and Hybrid Coordination Function (HCF) Controlled Channel
Access (HCCA), in order to reduce the experienced delay. The proposed scheduler,
local to the node, cooperates with the centralized HCCA scheduler, integrating the
offered service using the EDCA available resources. The simulations show that the
overall scheduler improves the performance with respect to the HCCA schedulers in
terms of scheduling efficiency and delay, allowing to guarantee the expected service
level
