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Abstract
A fairness and QoS guaranteed scheduling approach with fuzzy controls (FQFCs) is proposed for WiMAX OFDMA systems. The controllers, respectively, adjust priority and transmission opportunity (TXOP) for each WiMAX connection according to QoS requirements and service classes. The FQFC provides intra- and interclass fairness guarantees by making connections within the same class achieve equal degree of QoS while at the same time making those without QoS requirements equally share the remaining resources. Even in dynamic environments such as mobile WiMAX networks with time-variant traffic specifications, the FQFC fairly guarantees delay, throughput, and jitter, which are seldom achieved at the same time by state-of-the-art solutions.
Highlights
IEEE 802.16 standard (WiMAX) [1, 2] is one of the most popular standards for fixed and mobile broadband wireless access systems to provide last mile access
The FQFC scheduler first initializes the two variables based on the characteristics of connections and adjusts them, respectively, by two fuzzy controllers to adapt to the dynamics of system
We focus on the performance of real-time, nonrealtime polling service (nrtPS), and best effort (BE) connections
Summary
IEEE 802.16 standard (WiMAX) [1, 2] is one of the most popular standards for fixed and mobile broadband wireless access systems to provide last mile access. As summarized in [3], a resource scheduler in wireless multimedia networks needs to possess the following features: efficient link utilization, delay bound, low implementation complexity, throughput, scalability, and fairness. The method has low implementation complexity because the scheduler updates the priority of each connection per frame and allocates time slots to the connection with the highest priority. It does not consider fairness and jitter issues which are important metrics for real-time applications. We focus on proposing a downlink scheduling algorithm to provide QoS guarantees in PMP mode
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