A Novel Two-level Hierarchical Scheduling Scheme for Integrated WiMAX and EPON

Abstract

In this paper, a novel two-level scheduling algorithm for uplink transmission is proposed. The proposed scheme is characterized by using proportional fairness for the transmissions from subscriber stations (SSs) over the WiMAX channels, and a centralized mechanism at the Optical Line Terminal (OLT) for Ethernet Passive Optical Network (EPON) uplink transmission that connects to multiple WiMAX-ONU. The scheduler at the OLT receives a Report message from each WiMAX-ONU, which contains the average channel condition per cell, queues length, and head-of-line (HOL) delay for rtPS traffic. The EPON data frame is then scheduled based on these Report messages at the OLT. Numerical results show that the proposed scheme can satisfy the end-to-end QoS requirements for real-time services. In addition, we will show that the centralized scheduler at the OLT can achieve high throughput in presence of traffic load variation.