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— In this paper, we propose a power-efficient and QoS (Quality of Service)-aware MAC (Medium Access Control) scheduling algorithm for Bluetooth scatternet. If the inter-piconet scheduler in a bridge node between piconets operates simply by the Round Robin (RR) policy, a number of time slots may be wasted due to the guard time for piconet switching and the(More)
The expansion of embedded ICT infrastructure has resulted in the deployment of a wide range of embedded systems in our environment which indicate the need for reusable, manageable and flexible Wireless Sensor Network. Integration of WSN infrastructure with Cloud simplifies the system operation and maintenance as well as the cost and capable of providing(More)
A significant challenge when implementing time synchronization protocols is minimizing timestamp uncertainties. The major problem of time synchronization is not only that this packet delay exists, but also being able to predict the time spent on each can be difficult. This paper aims to reduce these uncertainties by estimating them in the transmitter and(More)
In this paper, we propose a QoS guaranteed and energy-efficient transmission scheme for Wireless Personal Area Networks (WPANs), which operate in conjunction with contention-based access protocols, such as CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance). Energy consumption is one of the most important issues in WPAN systems, because WPAN devices(More)
The smooth handoff supported by the route optimization extension to the mobile IP standard protocol should support a packet buffering mechanism at the base station (BS), in order to reduce the degradation in TCP performance caused by packet losses within mobile network environments. The purpose of packet buffering at the BS is to recover the packets dropped(More)