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https://ptsldigital.ukm.my/jspui/handle/123456789/513311Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Elankovan A. Sundararajan, Assoc. Prof. Dr. | |
| dc.contributor.author | Mahmoud Abdulwahab Alawi (P78192) | |
| dc.date.accessioned | 2023-10-16T04:35:25Z | - |
| dc.date.available | 2023-10-16T04:35:25Z | - |
| dc.date.issued | 2018-04-12 | |
| dc.identifier.other | ukmvital:100119 | |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/513311 | - |
| dc.description | A Heterogeneous Vehicular Network (HetVNET) is a promising network infrastructure that integrate various network technologies ranging from IEEE802.11p Dedicated Short Range Communication to the Third Generation/Fourth Generation cellular networks. In such network environment, wireless fidelity access points (Wi-Fi APs) can be utilized by vehicle users to stabilize the Long-Term Evolution (LTE) 4G networks through offloading. However, in the case of Wi-Fi APs is not readily available, the vehicles have to organized themselves and select appropriate mobile gateway (MGW) to communicate to the cellular infrastructure. However, it can be observed that utilizing the opportunistic Wi-Fi APs to offload the LTE networks in a HetVNET environment is relatively easier said than done. This condition is due to the short coverage of Wi-Fi APs and weak deployment strategies of APs. Many studies have proposed that offloading schemes depend on the historical Wi-Fi connection patterns observed by an interest vehicle in making an offloading decision. However, depending solely on the historical connection patterns affects the prediction accuracy and offloading ratio of most existing schemes even when AP location information is available. Consequently, the researchers are facing the problem of selecting best MGW vehicle to aggregate vehicle traffics and reduce LTE load in HetVNET in case where the Wi-Fi APs are not available for offloading. The selection process exerts extra network overheads and complexity due to allowing clusters to be formed in this highly dynamic environment. The main objective of this research is to enhance offload and gateway selection schemes for HetVNET. Firstly, the offload is enhanced using multi-criteria wireless availability prediction (MWAP) scheme, which utilizes historical connection patterns, historical data rate information, vehicular trajectory computation to predict the next available AP and its expected data capacity in making offloading decisions. The proposed scheme is decentralized and focuses on urban scenarios whereby the likelihood of the interest vehicle to encounter Wi-Fi APs is high. Secondly, the gateway selection is enhanced by proposed a non-cluster adaptive Quality of Service (QoS) aware gateway selection (AQAGS) scheme that dynamically selects small number of vehicles to act as gateways to LTE network depends on the load status of LTE network and QoS requirement of the Vehicular Ad hoc Network applications. The AQAGS scheme is focuses on the highway whereby the likelihood of the vehicle to encounter the Wi-Fi APs is low. The proposed schemes are evaluated using simulation. In case of MWAP scheme, MATLAB simulator was used and for AQAGS, the integration of SUMO and NS2 simulators were utilized and benchmark with the related start-of-the-art schemes. The simulation results show that, MWAP scheme improves the offloading ratio by 9.8% and 28.5%, compared to the reference schemes respectively. In addition, the overall prediction error is reduced by 7.5% compared to the benchmarked scheme. Meanwhile, AQAGS scheme delivered 20.7% improvement in overall system throughput while maintaining acceptable QoS for both Voice over Internet Protocol and File Transfer Protocol applications in comparison with cluster based scheme.,Certification of Master's/Doctoral Thesis" is not available | |
| dc.language.iso | eng | |
| dc.publisher | UKM, Bangi | |
| dc.relation | Faculty of Information Science and Technology / Fakulti Teknologi dan Sains Maklumat | |
| dc.rights | UKM | |
| dc.subject | Network | |
| dc.subject | Vehicular ad hoc networks (Computer networks) | |
| dc.title | Enhanced offload and gateway selection schemes for Heterogeneous Vehicular Networks | |
| dc.type | Theses | |
| dc.format.pages | 184 | |
| dc.identifier.callno | TE228.37.A433 2018 3 tesis | |
| Appears in Collections: | Faculty of Information Science and Technology / Fakulti Teknologi dan Sains Maklumat | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_100119+SOURCE1+SOURCE1.0.PDF Restricted Access | 467.45 kB | Adobe PDF |  View/Open |
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