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Energy is the most crucial but scarce resource in wireless sensor networks (WSNs). A wealth of MAC protocols are proposed only to prolong the network lifetime for energy-efficiency; whereas, others are tailored to reduce end-to-end latency in addition to extending the network lifetime. Since the requirements depend on the applications of the network, it would be difficult to design a single MAC that...
IEEE 802.11 DCF exhibits poor scalability due to the large contention overhead. Therefore, the more the number of stations, the less the aggregate throughput. We propose a two-phase collision avoidance scheme to reduce the collision probability and to enhance the throughput performance. In our proposed scheme, contention among stations is resolved in two phases: SuperSlots and SubSlots. Also, our...
IEEE 802.11 DCF shows the inefficient throughput performance, due to the large backoff and collision overheads. We propose the block-poll coordination function (BCF) to reduce the backoff and collision overheads, thus increasing the aggregate throughput. By introducing a new Block-poll frame which includes a polling bitmap, each station can decide its transmission order, so that the channel access...
Korea Telecommunication and Seoul National University initiated a joint project as an effort of collaboration for building U-Campus early this year. As a part, our project aims to develop a measurement infra system and measure wireless traffic in SNU NESPOT Zone. Currently, SNU NESPOT Zone is successfully built, so the registered users are able to use the Internet anywhere in Seoul National University...
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