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In this paper, we propose a new medium access control (MAC) scheme called dynamic contention window adjustment (DCWA) in saturated load conditions, which dynamically optimizes each active node's backoff process in wireless LANs. The key idea is to enable each node to adjust its Contention Window (CW) to approach the optimal one that will make the throughput achieve or approach the maximum. Meanwhile,...
IEEE 802.15.4 has poor performances in multi-hop network for the hidden terminal problem (HTP). This paper proposes a simple and effective mechanism to reduce the HTP in nonbeacon-enabled multi-hop network. Using the idea of RTS/CTS in IEEE 802.11 for reference, we propose adaptive adoption of RTS/CTS (a-RtsCts-CSMA/CA) depending on the collision result of transmissions and measure its performances...
It is important to achieve high throughput and good fairness through MAC schemes in wireless LANs. Although lots of research efforts have been spent on improving the performance of IEEE 802.11, most of them focus on a single aspect while disregarding others. In this paper, we propose a novel MAC scheme called DCWA-ANCIS (Dynamic Contention Windows Adjustment based on Average Number of Consecutive...
In many sensor network applications the major traffic pattern consists of data collected from many source nodes to a sink through a tree. In this paper, we propose S-Non Bcn based on nonbeacon-enabled (Non Bcn) mode of IEEE 802.15.4, an energy-efficient and low-collision MAC that is designed and optimized for such data gathering trees in wireless sensor networks. S-Non Bcn uses staggered sleep mechanism...
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