An 802.16 model for NS2 simulator with an integrated QoS architecture

ABSTRACT

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.

REFERENCES

• 1: IEEE Std 802.16--2004. IEEE Standard for Local and metropolitan area networks- Part 16: Air Interface for Fixed Broadband Wireless Access Systems. 2004.
• 2: IEEE Std 802.16e 2005. IEEE Standard for Local and metropolitan area networks Part 16-Amendment 2 and Corrigendum 1. 2005.
• 3: J. Chen et al. A Service Flow management Strategy for IEEE 802.16 Broadband Wireless Access Systems in TDD Mode. In IEEE International Conference on Communications (ICC2005), 2005.
• 4: Jenhui Chen , Chih-Chieh Wang , Frank Chee-Da Tsai , Chiang-Wei Chang , Syao-Syuan Liu , Jhenjhong Guo , Wei-Jen Lien , Jui-Hsiang Sum , Chih-Hsin Hung, The design and implementation of WiMAX module for ns-2 simulator, Proceeding from the 2006 workshop on ns-2: the IP network simulator, October 10-10, 2006, Pisa, Italy [doi>10.1145/1190455.1190458]
• 5: I. Msadaa. Intégration de la Norme IEEE 802.16 dans l'environnement do simulation NS2. Computer Science Master's thesis, Ecole Nationale des Sciences de l'Informatique, Tunisia, Dec. 2006.
• 6: K. Fall and K. Varadhan. ns Notes and Documentation. Dec. 2005.
• 7: J. Robinson. 802.11 MAC code in NS2 (version 2.28). http://www.ece.rice.edu/~jpr/ns/docs/802_11.html.
• 8: National Institute of Standards and Technology. http://www.antd.nist.gov/seamlessandsecure/doc.html.
• 9: S. Kim and I. Yeom. http://cnlab.kaist.ac.kr/802.16/ieee802.16.html

INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.6 SIMULATION AND MODELING
      I.6.m Miscellaneous

Additional Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Wireless communication

Keywords:
802.16, CAC, NS2, OFDM, QoS, TDD, scheduling