Model based bandwidth scavenging for device coexistence in wireless LANs
ICDCN'11 Proceedings of the 12th international conference on Distributed computing and networking
Fast track article: Bandwidth scavenging for device coexistence in pervasive computing systems
Pervasive and Mobile Computing
Proceedings of the 11th ACM international symposium on Mobility management and wireless access
Analysis of a prioritized contention model for multimedia wireless sensor networks
ACM Transactions on Sensor Networks (TOSN)
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Running real time applications over wireless LANs is becoming common place. These applications require QoS. But the most widely used wireless LAN, IEEE 802.11, does not have QoS support. Hence, providing QoS in 802.11 WLANs is an important issue due to its large installation base. In this paper, we propose a priority based service differentiation mechanism at the MAC layer. The MAC assigns different contention windows to two priority classes to provide service differentiation. The MAC protocol was designed such that minimal change is required in 802.11 firmware and yet the performance is comparable to 802.11e MAC. When collision occurs, contention window is increased in a linear fashion and the new contention windows for high and low priority traffic become non-contiguous. This unique method of contention window management provides better relative performance between the two classes. We also propose an enhancement to our base protocol that further increases throughput at light load condition. We present our simulation experiment results that show that our protocol has performance comparable to 802.11e.