70,220 research outputs found
Green Cellular Networks: A Survey, Some Research Issues and Challenges
Energy efficiency in cellular networks is a growing concern for cellular
operators to not only maintain profitability, but also to reduce the overall
environment effects. This emerging trend of achieving energy efficiency in
cellular networks is motivating the standardization authorities and network
operators to continuously explore future technologies in order to bring
improvements in the entire network infrastructure. In this article, we present
a brief survey of methods to improve the power efficiency of cellular networks,
explore some research issues and challenges and suggest some techniques to
enable an energy efficient or "green" cellular network. Since base stations
consume a maximum portion of the total energy used in a cellular system, we
will first provide a comprehensive survey on techniques to obtain energy
savings in base stations. Next, we discuss how heterogeneous network deployment
based on micro, pico and femto-cells can be used to achieve this goal. Since
cognitive radio and cooperative relaying are undisputed future technologies in
this regard, we propose a research vision to make these technologies more
energy efficient. Lastly, we explore some broader perspectives in realizing a
"green" cellular network technologyComment: 16 pages, 5 figures, 2 table
Towards efficient coexistence of IEEE 802.15.4e TSCH and IEEE 802.11
A major challenge in wide deployment of smart wireless devices, using
different technologies and sharing the same 2.4 GHz spectrum, is to achieve
coexistence across multiple technologies. The IEEE~802.11 (WLAN) and the IEEE
802.15.4e TSCH (WSN) where designed with different goals in mind and both play
important roles for respective applications. However, they cause mutual
interference and degraded performance while operating in the same space. To
improve this situation we propose an approach to enable a cooperative control
which type of network is transmitting at given time, frequency and place.
We recognize that TSCH based sensor network is expected to occupy only small
share of time, and that the nodes are by design tightly synchronized. We
develop mechanism enabling over-the-air synchronization of the Wi-Fi network to
the TSCH based sensor network. Finally, we show that Wi-Fi network can avoid
transmitting in the "collision periods". We provide full design and show
prototype implementation based on the Commercial off-the-shelf (COTS) devices.
Our solution does not require changes in any of the standards.Comment: 8 page
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