Call Admission Control Scheme for Improved Quality of Service in WiMAX Communication at Vehicular Speeds

The IEEE 802.16e standard, also known as mobile WiMAX, has emerged as an exciting mobile wireless communication technology that promises to offer both high throughput and guaranteed quality of service (QoS). Call admission control (CAC) scheme serves as a useful tool for WiMAX, which ensures that resources are not overcommitted and thereby, all existing connections enjoy guaranteed QoS. Existing CAC schemes largely depend on readily available information like currently available resources and bandwidth demand of the new call while making an acceptance or rejection decision once a new request arrives. Since wireless channels are not as reliable as wired communication, CAC scheme in WiMAX communication faces a serious challenge of making a right estimate of the usable channel capacity (i.e., effective throughput capacity) while computing the available resources in various communication scenarios. Existing CAC schemes do not consider the impact of mobility at vehicular speeds when computing the usable link capacity and available resources. In this paper, we propose a new CAC scheme that estimates the usable link capacity for WiMAX communication at various vehicular speeds and uses this information while making a CAC decision. The proposed CAC scheme takes the speed distribution model of a mobile node into account during the CAC decision making process. Simulation results confirm that the proposed scheme achieves lower dropping rate and improved QoS compared to existing schemes.

[1]  Iftekhar Ahmad,et al.  High Utility Video Surveillance System on Public Transport Using WiMAX Technology , 2010, 2010 IEEE Wireless Communication and Networking Conference.

[2]  Tzu-Chieh Tsai,et al.  Token bucket based CAC and packet scheduling for IEEE 802.16 broadband wireless access networks , 2006, CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006..

[3]  Gordon L. Stuber,et al.  Principles of mobile communication (2nd ed.) , 2001 .

[4]  Yusheng Ji,et al.  Admission Control for Non-preprovisioned Service Flow in Wireless Metropolitan Area Networks , 2007, Fourth European Conference on Universal Multiservice Networks (ECUMN'07).

[5]  D.P. Agrawal,et al.  Dynamic admission control and QoS for 802.16 wireless MAN , 2005, Symposium, 2005 Wireless Telecommunications.

[6]  Iftekhar Ahmad,et al.  A novel mobile WiMAX solution for higher throughput , 2008, 2008 16th IEEE International Conference on Networks.

[7]  Geng-Sheng Kuo,et al.  An Efficient Admission Control Scheme for Adaptive Multimedia Services in IEEE 802.16e Networks , 2006, IEEE Vehicular Technology Conference.

[8]  Chung-Ju Chang,et al.  Radio resource management of heterogeneous services in mobile WiMAX systems [Radio Resource Management and Protocol Engineering for IEEE 802.16] , 2007, IEEE Wireless Communications.

[9]  Mohsen Guizani,et al.  Call Admission Control Optimization in WiMAX Networks , 2008, IEEE Transactions on Vehicular Technology.

[10]  Aura Ganz,et al.  Packet scheduling for QoS support in IEEE 802.16 broadband wireless access systems , 2003, Int. J. Commun. Syst..

[11]  Iftekhar Ahmad,et al.  Call Admission Control Scheme for the IEEE 802.16e at Vehicular Speeds , 2010, 2010 IEEE 12th International Conference on High Performance Computing and Communications (HPCC).

[12]  Nj Piscataway,et al.  Wireless LAN medium access control (MAC) and physical layer (PHY) specifications , 1996 .

[13]  S. Wang,et al.  IEEE standard 802.16: a technical overview of the WirelessMAN/sup TM/ air interface for broadband wireless access , 2002, IEEE Communications Magazine.

[14]  Todor Cooklev.  Wireless Communication Standards: A Study of IEEE 802.11, 802.15, and 802.16 , 2004 .

[15]  Voon Chin Phua,et al.  Wireless lan medium access control (mac) and physical layer (phy) specifications , 1999 .

[16]  P. Dey,et al.  Speed Distribution Curves under Mixed Traffic Conditions , 2006 .