Abstract
Abstract Multimedia applications over the Internet, such as IPTV and video-on-demand, have become fast growing applications in recent years. Such applications have stringent quality of services (QoS) constraints in terms of bandwidth, delay, and packet loss. As a consequence, broadband access networks play an important role for multimedia applications. There are two emerging technologies offering both high bandwidth and QoS support, namely Ethernet Passive Optical Network (EPON) and Worldwide Interoperability for Microwave Access (WiMAX). By integrating these two technologies, EPON-WiMAX integrated network can: (1) provide broadband access, (2) support mobile users, and (3) decrease network planning cost and operating cost. Thus, EPON-WiMAX integrated network is an ideal choice for multimedia applications with ubiquitous access. Although EPON-WiMAX integrated network has received growing attentions, however, most of previous works focus on the scheduling and bandwidth allocation in the upstream direction. Therefore, in this paper, we investigate the downlink scheduling and bandwidth allocation problem in EPON-WiMAX integrated networks. The objective of the study is to maximize the system throughput and guarantee the (QoS) so that the requirements of multimedia applications can be fulfilled. We proposed a two-stage downlink packet scheduling and resource allocation mechanism collaborating with application layer forward error correction (AL-FEC). We demonstrated the performance of our approach via simulations. Our simulation results indicated that the proposed mechanism increased the system throughput significantly, especially when AL-FEC is adopted.
Highlights
A variety of popular multimedia applications have posted a high bandwidth requirement, such as high-definition television and video-on-demand services, which indicated that the broadband access technology has become more and more important
Ethernet Passive Optical Network (EPON)-WiMAX is a promising solution for broadband access network with mobility support
We focused on the downlink scheduling problem from Optical Line Terminal (OLT) to Optical Network Units (ONUs)-Base Station (BS), referred to as the first-stage scheduling, and from ONU-BS to subscriber stations (SSs), referred to as the second-stage scheduling
Summary
A variety of popular multimedia applications have posted a high bandwidth requirement, such as high-definition television and video-on-demand services, which indicated that the broadband access technology has become more and more important. Yang et al [6] presented a converged network architecture based on the concept of virtual ONU-BS (VOB) and proposed a QoS-aware dynamic bandwidth allocation (DBA) scheme. A two-stage design of downlink packet scheduling and resources allocation was proposed for the EPON-WiMAX hybrid access networks. Dias Piquet and Saldanha Fonseca [16] assessed the performance of a standard-compliant WiMAX uplink scheduler and showed that the scheduler can provide QoS support to the SSs. Relatively less attention has been focused on downlink packet scheduling and bandwidth allocation on the integration of EPON and WiMAX. In this study, we proposed two-stage design of downlink packet scheduling and resources allocation to improve the system throughput and provide QoS guarantee for each traffic class
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