The design and implementation of WiMAX module for ns-2 simulator
WNS2 '06 Proceeding from the 2006 workshop on ns-2: the IP network simulator
Proceedings of the 2nd International Conference on Simulation Tools and Techniques
WiMAX-RBDS-Sim: an OPNET simulation framework for IEEE 802.16 mesh networks
Proceedings of the 3rd International ICST Conference on Simulation Tools and Techniques
Simulation
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The IEEE 802.16 technology is emerging as a promising solution for BWA due to its ability to support multimedia services and to operate in multiple physical environments. Also, with data rates in excess of 120 Mbps, it provides a cost-effective alternative to wireline broadband access systems. Unfortunately no open-source simulation environment supporting this technology has been proposed so far. Therefore this work is meant to be a contribution to build an 802.16 simulation model for NS2, the most popular network simulator. In this paper, we present the details of design and implementation of the proposed simulation model. Our model includes a novel QoS architecture, and addresses 802.16 fixed BWA systems that use Orthogonal Frequency Division Multiplexing (OFDM) modulation and operate in TDD mode. The QoS architecture we propose consists of a call admission control (CAC) policy and a hierarchical scheduling algorithm that flexibly adjusts uplink and downlink bandwidth to serve unbalanced traffic. Both scheduling and CAC algorithms are based on an adaptive modulation and coding (AMC) scheme.