New Downlink Scheduling Framework for Hybrid Unicast and Multicast Traffic in WiMAX Networks

Full Text (PDF, 236KB), PP.69-79

Views: 0 Downloads: 0

Author(s)

Rashid Karimi 1,* Saleh Yousefi 2 Ali Azarpeyvand 3 Vahid.K.Alilou 4

1. Islamic Azad University of Zanjan, Znjan, Iran

2. University of Urmia, Urmia, Iran

3. University of Zanjan, Zanjan, Iran

4. Azad University, Tehran, Iran

* Corresponding author.

DOI: https://doi.org/10.5815/ijwmt.2012.05.10

Received: 1 Jul. 2012 / Revised: 11 Aug. 2012 / Accepted: 12 Sep. 2012 / Published: 15 Oct. 2012

Index Terms

WiMAX Network, Scheduling, PQ Algorithm, Aging Method

Abstract

WiMAX networks based on IEEE 802.16 standard has expedited broadband wireless access surge in recent years. The traffic in these networks is identified in four types of class of service with different QoS requirements. Therefore, scheduling mechanism to manage these services in order to meet QoS requirements is a crucial fact and an important challenge. In this paper, for PMP mode of WiMAX networks, a two-level scheduling mechanism in MAC layer of Base Station (BS) has been proposed. The proposed scheduling algorithm takes into account hybrid unicast and multicast downlink traffic including three classes of service: rtps, nrtps and BE. In the first level of this scheduling mechanism, we have used the scheduling algorithms WRR and FCFS to schedule the connections and in its second level, the PQ algorithm based on Aging method is used to manage and schedule the packets. The functionality of the proposed scheduling algorithm is compared with priority queuing (PQ) algorithm. The resulting outcome of simulation shows that the proposed design has quite a better performance for Best Effort (BE) service class. Furthermore the delay of the rtps class and total throughput of the network is increased noticeably.

Cite This Paper

Rashid Karimi, Saleh Yousefi, Ali Azarpeyvand, Vahid.K.Alilou,"New Downlink Scheduling Framework for Hybrid Unicast and Multicast Traffic in WiMAX Networks", IJWMT, vol.2, no.5, pp.69-79, 2012. DOI: 10.5815/ijwmt.2012.05.10 

Reference

[1]IEEE Std 802.16e – 2005 and IEEE Std 802.16 – 2004/Corl – 2005.(Amendment and Corrigendum to IEEE Std 802.16 -2004).

[2]C.So-In , R.Jain,A.Tamimi " Scheduling in IEEE 802.16 mobile WiMAX networks key issues and a survey". 

[3]Fen Hou, Pin-Han Ho , Xuemin (Sherman) Shen. "An efficient delay constrained scheduling scheme for IEEE 802.16 networks"Springer Science+Business Media, LLC 2007 .

[4]L.Nuaymi. “ WiMAX : Technology for Broadband Wireless Access “ .Jhon Wiley & Sons 2007.

[5]Sheng-Tzong Cheng, Bo-Fu Chen, and Chih-Lun Chou “Fairness-based Scheduling Algorithm for TDD Mode IEEE 802.16 Broadband Wireless Access Systems “ .2008.

[6]Vishal Sharma , Namita Vamancy “The Uniformly-Fair Deficit Round-Robin (UF-DRR) Scheduler for Improved QoS Guarantees in IEEE 802.16 WiMax Networks”.2007.

[7]Yi Wu , Yanqun Le , Dongmei Zang “An Internal Scheduling Framework for Management of Best Effort Connections per SS in WiMAX System”.2008. 

[8]Xiaojuan Xie , Haining Chen Hongyi Wu “Simulation Studies of a Fair and Effective Queueing Algorithm for WiMAX Resource Allocation”.2008.

[9]Alexander Sayenko , Olli Alanen , Timo Hamalainen “Scheduling solution for the IEEE 802.16 base Station”.2007.

[10]Mehri Mehrjoo , Mehrdad Dianati , Xuemin Shen , Kshirasagar Naik “Opportunistic fair scheduling for the downlink of IEEE 802.16 Wireless Metropolitan Area Networks”.

[11]Nararat RUANGCHAIJATUPON , Yusheng JI “Adaptive Scheduling with Fairness in IEEE 802.16e Networks”.2007.