An Adaptive QoS Architecture for IEEE 802.16 Broadband Wireless Networks

In this paper, we propose a new QoS architecture for PMP 802.16 systems operating in TDD mode over wirelessMAN-OFDM physical layer. It includes a call admission control policy and a hierarchical scheduling algorithm. The CAC policy we propose adopts a min-max fairness approach making efficient and fair use of available resources. The proposed scheduling algorithm flexibly adjusts uplink and downlink bandwidth to serve unbalanced traffic while considering adaptive modulation and coding (AMC) scheme. The efficiency of the proposed QoS architecture is revealed through simulation.