Enhanced selection gateway scheme for multi hop relay vehicular networks /
Integration of Vehicular Ad-hoc Network (VANET) and Universal Mobile Telecommunication System (UMTS) are promising architectures for future machine-to-machine (m2m) applications. In this integration, vehicles may have more than one network interface which makes possible for the vehicles to connect t...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
Kuala Lumpur:
Kulliyyah of Engineering, International Islamic University Malaysia,
2012
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| Subjects: | |
| Online Access: | http://studentrepo.iium.edu.my/handle/123456789/4757 |
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| Summary: | Integration of Vehicular Ad-hoc Network (VANET) and Universal Mobile Telecommunication System (UMTS) are promising architectures for future machine-to-machine (m2m) applications. In this integration, vehicles may have more than one network interface which makes possible for the vehicles to connect to either infrastructure mode or ad-hoc mode. This will help the vehicles to have steady Internet connection through UMTS network. At the same time, it can communicate with other vehicles for safety information such as collision avoidance, congestion avoidance, file sharing etc. However, the dead spot areas and unsuccessfully handoff processes due to the high speed of the vehicles i.e. especially in the highway, can disrupt the implementation of this kind of architecture. Many solutions have been proposed for this problem, one of them is the cluster-based solution. The aims of these schemes are to improve network connection within dead spot areas and relaxing frequent handoff process between UMTS cells. However, cluster-based solution needs a heavy signalling exchange for cluster formulation, cluster head selection and gateway selection, which add a lot of overhead. In this research work, a simplified gateway selection (SGS) scheme for multihop relay scheme in VANET-UMTS integration network is proposed. SGS is a cluster based solution, however due to the rapid change in the VANET topology here the cluster will not be formulated until the received signal strength indicator (RSSI) is dropped under certain threshold, which is the area before the dead spot or handoff to other cell. At this point, the vehicles start to formulate a cluster by searching for suitable gateway. Different metrics i.e. relay discovery, relay selection and gateway selection are discussed and examined. An integrated simulation environment combined with VanetMobiSim and NS2 are used to simulate and evaluate the performance of the proposed SGS scheme. Moreover, SGS scheme can be implemented with any VANET routing protocols. In this research work, we implemented on both reactive i.e. Ad-hoc On Demand Distance Vector (AODV) and proactive i.e. Destination-Sequenced Distance-Vector Routing (DSDV) routing protocols. The simulations results show that SGS scheme can offer 21% packet delivery ratio and 15.6% throughput higher when it is implemented with AODV compare with DSDV. Furthermore, SGS scheme is compared with Clustering-based Multi-metric adaptive mobile Gateway Management mechanism (CMGM) proposed in previous work and the simulation result indicate that SGS scheme reduce the control overhead and gateway selection delay by 11.4% and 25% respectively for different wireless transmission range and number of vehicles on the road. In addition, SGS scheme increased the packet delivery ratio by 10% compare to its counterpart (CMGM) for the vehicles that move in speed varies from 20 to 160 km/hr. |
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| Item Description: | Abstract in English and Arabic. "A dissertation submitted in fulfilment of the requirement for the degree of Master of Science in Communication Engineering."--On t.p. |
| Physical Description: | xiv, 107 leaves : ill. ; 30cm. |
| Bibliography: | Includes bibliographical references (leaves 100-107). |