IEEE 802.11e EDCA QoS Provisioning with Dynamic Fuzzy Control and Cross-Layer Interface

We propose a dynamic fuzzy logic control (DFLC) for further enhancement of the IEEE 802.11e enhanced distributed channel access (EDCA) function. Although legacy IEEE 802.11 was enhanced by the 802.11e, in wireless networks real-time traffics over the IEEE 802.11e suffer unacceptable quality especially when network state is dynamic. We adopt fuzzy logic for tackling uncertainty in wireless networks. To deal with the dynamics in wireless networks, fuzzy rules with cognitive consequents are adopted. For streaming multimedia objects over wireless networks, the dynamic fuzzy controller tunes the backoff parameters of the EDCA function to meet the dynamic traffic specification (TSPEC), which is defined by upper layers. Moreover, to support cross-layer design, a cross-layer interface is provided to transport the TSPEC to the MAC layer. Analysis and experiments show that the dynamic fuzzy control provides realtime bandwidth allocation and at the same time preserves fairness.