Time synchronization in wireless sensor networks (WSNs) is a fundamental issue for the coordination of distributed entities and events. Non-deterministic latency, which may decrease the accuracy and precision of time synchronization can occur at any point in the network layers. Specially, random back-off by channel contention leads to a large uncertainty. In order to reduce […]
Jul
Jun
As the era of the ubiquitous computing is ushered in, consumers have been primed for a variety of automation applications. Active RFIDs can be used for a number of automation applications because it may also have other sensors to extend its applications. An active RFID instinctively focuses on a long communication range. Nevertheless, active RFIDs […]
Sep
This paper proposes an adaptive hybrid data broadcast scheme for wireless converged networks. Balanced allocation of broadcast resource between Push and Pull and adaptation to the various changes of user request are keys to the successful operation of a hybrid data broadcast system. The proposed scheme is built based on two key features, BEI (Broadcast […]
Aug
Handoff is one of the most important factors that may degrade the performance of TCP connections in wireless data networks. The authors present a lossless handoff scheme called LPM (Last Packet Marking). LPM signals the safe handoff cue by sending a specially marked packet to mobile hosts. Our performance study shows that LPM achieves lossless packet delivery […]
Feb
Recently, the IEEE 802.11 working group has announced a new distributed access mechanism called Enhanced DCF (EDCF) to provide service differentiation among traffic classes defined as access category. With the increasing demand for supporting Quality of Service (QoS) in IEEE 802.11 wireless LANs, the EDCF is now attracting many researchers’ attention due to its practical […]
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