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In wireless sensor networks (WSNs) energy balancing and energy efficiency are the key requirements to prolong the network lifetime. In this paper, we investigate the problem of energy hole, where sensor nodes located near the sink or in some other parts of the network die very early due to unbalanced load distribution. Moreover, there is a dire need to utilize the energy resource efficiently. For...
On large scale disasters, such as the Eastern Japan Great Earthquake and Kumamoto Earthquake, due to mud slides of cliff and floodwater of rivers, many disaster areas are physically isolated and relief and support activities of victims become quite difficult. The communication means are also destructed in those areas and cannot transmit the disaster information. In order to resolve those problems,...
This work explores the theoretical and practical performances of the two most recent IEEE standards, 802.11n and 802.11ac. Experiments were conducted to measure data rates to characterize performance effects of distance and interference between different channels. We conclude that the majority of test cases show 802.11ac achieved higher data rates than its predecessor, as expected. However, performance...
We have conducted an empirical study of the latest 5GHz IEEE 802.11wireless LAN (WLAN) variants of 802.11n (5GHz) and 802.11ac (Wave 1), underdifferent cell load conditions. We have considered typicalconfigurations of both protocols on a Linux testbed. Under light load, there is no clear difference between 802.11n and 802.11ac in terms ofperformance and energy consumption. However, in some cases of...
In wireless sensor networks (WSNs) energy balancing and energy efficiency are the key requirements to prolong the network lifetime. In this paper, we investigate the problem of energy hole, where sensor nodes located near the sink or in some other parts of the network die very early due to unbalanced load distribution. Moreover, there is a dire need to utilize the energy resource efficiently. For...
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