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Since the FCC stated a policy on unlicensed use of the TV white-spaces (TVWS) in November 2008, a number of countries and regions have studied utilization of the TVWS, and some communication systems using the TVWS have been globally discussed and standardized. It has been three years since the IEEE 802.11af has been standardized, while the IEEE 802.11af-based system is not yet applied for commercial...
This paper presents the network performance analysis of a low energy IEEE 802.15.4/4e/4m LR-WPAN operating in TV White Space. An energy-efficient mechanism optimizing the tradeoff between device sleep time and synchronization strategy is utilized to reduce the total power consumption in a non-beacon-enabled network. To evaluate the performance of the network, we have modeled a cross-layer system starting...
This paper presents the evaluation on energy consumption of power saving mechanisms in recent IEEE 802.15.4 Low-Rate Wireless Personal Area Network (LR-WPAN) systems. The LR-WPAN applications share a common system requirement of high energy efficiency through power saving mechanisms to prolong battery lifespan. First, the recent IEEE 802.15.4 standard amendments including, but not limited to IEEE...
In this paper we analyze mechanisms of coexistence between different cognitive radio systems operating as secondary users in white space frequency bands. In particular, our focus is coexistence mechanisms that can be provided by IEEE 802.19.1 coexistence system. IEEE 802.19.1 standard is at the early stage of its development. At this stage it is very important to consider different design directions...
Regulatory information and sensing information are used to determine available spectrum (white spaces) and to facilitate dynamic spectrum access. This paper analyses the effect of a local white spaces database called sensing database (SDB) which relays regulatory information from regulatory database and contains sensing related information obtained by distributed sensing schemes. Since the SDB is...
To achieve ultra high data rate communications in 60 GHz Wireless Personal Area Networks (WPANs), frame aggregation is devised in IEEE 802.15.3c to increase the MAC transmission efficiency. In this work, we propose a novel statistical model to analyze the behavior of two types of frame aggregation mechanisms: standard frame aggregation and low latency frame aggregation. Through our model, we could...
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