WTTP : A Scheduling Algorithm for Supporting QoS in IEEE 802.11e

Inhalt:
This paper proposes a scheduling algorithm, the Wireless Timed Token Protocol (WTTP) for the Access Point of an IEEE 802.11e wireless network, to serve traffic streams with QoS guarantees. WTTP provides the established streams with rate-based guarantees. Furthermore, it makes the capacity not used by those streams available to contention-based access. The performance of WTTP is compared to that of a reference scheduler defined in the 802.11e draft standard using the ns2 simulator. The results show that WTTP outperforms the refer-ence scheduler with VBR traffic, both in terms of resource utilization and maximum number of admitted flows.