QoE Aware Video Streaming and Optimal Relay for Emergency Message Dissemination in Graph Based VANET
Aduomer Girmay Gebray,
Dong Wang
Issue:
Volume 7, Issue 1, March 2022
Pages:
1-14
Received:
12 January 2022
Accepted:
28 January 2022
Published:
16 February 2022
Abstract: Vehicular Ad hoc Network (VANET) is a dynamic network environment that supports the transmission of any type of data that varies with size and delay constraints. VANET also enables to aid safety message forwarding in case of emergency by means of data dissemination. The major problematic issues in routing and data dissemination are delay and broadcast storm. With the advancements in VANET technology not only normal traffic data transmission but also video streaming is transmitted while the delay constraint has to be very less for video streaming. This article addresses these two problems by designing a graph aware network management for emergency message dissemination by selecting an optimal relay using multi-objective shuffled shepherd optimization algorithm that computes degree, goodness, waiting time, transmission range and link utility. Graph is constructed with the link stability, signal strength, distance and speed between vehicles. The selected relay vehicle from the graph is responsible to disseminate the safety message, which reduces the broadcast storm. The use of reinforcement learning is able to select the most suitable low delay neighbors for video streaming. In routing, the normal traffic data transmission is performed which is tolerable to delay, so Type-2 fuzzy logic is used with dynamic belief entropy that defines routes with the computation of quality of forwarding, bandwidth, distance and hop counts. This proposed work is implemented on OMNeT++ simulator and the results show better performances than the existing work in terms of packet delivery ratio, end-to-end delay, duplicate packets, throughput, and frame loss.
Abstract: Vehicular Ad hoc Network (VANET) is a dynamic network environment that supports the transmission of any type of data that varies with size and delay constraints. VANET also enables to aid safety message forwarding in case of emergency by means of data dissemination. The major problematic issues in routing and data dissemination are delay and broadc...
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Rain Attenuation of Radio Waves in South-Eastern Nigeria
Michael Ugwu Onuu,
Emaekop Umoh,
Christian Nlemchi Nwosu
Issue:
Volume 7, Issue 1, March 2022
Pages:
15-20
Received:
12 March 2022
Accepted:
13 April 2022
Published:
28 April 2022
Abstract: Analysis of daily rainfall data collected over a period of years is important, especially in the study of rain attenuation of radio waves. This study investigates rain attenuation of radio waves in South-eastern Nigeria which is a tropical location. The daily rainfall data used for this study on Rain Attenuation of Radio Waves in South-Eastern Nigeria was collected from the Nigeria Meteorological Agency (NiMet), Abuja, Nigeria, for a period of 10 years, 1997-2007. The data which was for Calabar (Lat. 4.58°N, Long. 8.21°E), Ikom (Lat. 6.0°N, Long. 8.87°E), Ogoja (Lat. 6.8°N, Long. 8.71°E), Port Harcourt (Lat. 4.51°N, Long. 7.01°E) and Uyo (Lat. 5.02°N, Long. 7.56°E) was subsequently analysed and reduced to obtain rain parameters such as rain rate, R (mm/h), mean annual rainfall, NR (mm), raindrop diameters, Dm (mm), total number of raindrops and rain attenuation, AR (dB). The results of the analysis were compared with those obtained by other researchers and found to be in good agreement. The reduced dip-to-peak values of signal strength observed in our recent studies in South-Eastern Nigeria lend credence to rain attenuation of radio waves in this part of the world. Effects of rain parameters on telecommunication, especially with respect to attenuation, were deduced and they also agreed strongly with literature.
Abstract: Analysis of daily rainfall data collected over a period of years is important, especially in the study of rain attenuation of radio waves. This study investigates rain attenuation of radio waves in South-eastern Nigeria which is a tropical location. The daily rainfall data used for this study on Rain Attenuation of Radio Waves in South-Eastern Nige...
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