Scheduling in IEEE 802.16e Mobile WiMAX networks: key issues and a survey
IEEE Journal on Selected Areas in Communications - Special issue on broadband access networks: Architectures and protocols
ARQ parameters for VoIP in IEEE 802.16 networks
WTS'09 Proceedings of the 2009 conference on Wireless Telecommunications Symposium
QoE Assessment of VoIP in Next Generation Networks
MMNS 2009 Proceedings of the 12th IFIP/IEEE International Conference on Management of Multimedia and Mobile Networks and Services: Wired-Wireless Multimedia Networks and Services Management
Application-aware scheduling for VoIP in Wireless Mesh Networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Improving performance of VoIP services in IEEE 802.16 OFDMA system
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Management of upstreaming profiles for WiMAX
APNOMS'09 Proceedings of the 12th Asia-Pacific network operations and management conference on Management enabling the future internet for changing business and new computing services
Dynamic end-to-end capacity in IEEE 802.16 wireless mesh networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Electronic governance in rural areas: a performance case study with WiMAX technology
ADCONS'11 Proceedings of the 2011 international conference on Advanced Computing, Networking and Security
A VoIP system for mobility voice security support using the VPN
Security and Communication Networks
A novel network mobility management scheme supporting seamless handover for high-speed trains
Computer Communications
Performance-Driven Robust Video Multicast over broadband wireless access networks
Journal of High Speed Networks
| Hi-index | 14.98 |
In this paper, we exploit the rich set of flexible features offered at the medium access control (MAC) layer of WiMax for construction and transmission of {\em MAC protocol data units} (MPDU) for supporting multiple VoIP streams. We study the quality of VoIP calls, usually given by R-score, with respect to delay and loss of packets. We observe that loss is more sensitive than delay, hence we compromise the delay performance within acceptable limits in order to achieve a lower packet loss rate. Through a combination of techniques like forward error correction, automatic repeat request, MPDU aggregation, and minislot allocation, we strike a balance between the desired delay and loss. Simulation experiments are conducted to test the performance of the proposed mechanisms. We assume a three-state Markovian channel model and study the performance with and without retransmissions. We show that the feedback-based technique coupled with retransmissions, aggregation, and variable length MPDUs are effective and increases the R-score and mean opinion score by about 40%.