| dc.contributor.author | Artimy, Maen M. | en_US |
| dc.date.accessioned | 2014-10-21T12:33:37Z | |
| dc.date.available | 2006 | |
| dc.date.issued | 2006 | en_US |
| dc.identifier.other | AAINR27637 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10222/54914 | |
| dc.description | This thesis discusses the transmission range assignment problem in Vehicular Ad Hoc Networks (VANET) on highways. The unique mobility characteristics of vehicle traffic affect VANETs by creating a non-homogenous distribution of nodes on the network. Determining the Minimum Transmission Range (MTR) that guarantees the connectivity in various traffic conditions entails considering traffic situations that result in disturbing the homogenous distribution of vehicles. Such situations arise either from spontaneous traffic jams that occur at high vehicle densities or from road constraints. A variation of the Nagel and Schreckenberg (NaSch) model is used in this thesis to analyze vehicle traffic and develop a traffic simulator, RoadSim, to generate vehicle movements. | en_US |
| dc.description | This thesis provides a number of contributions related to estimating the MTR in VANETs. A lower bound for the MTR is derived for VANETs on uninterrupted highways. This lower bound is the first analytical work that takes into account the non-homogeneous distribution of vehicles caused by traffic jams. Additional analytical and empirical relationships are derived to estimate the MTR in VANETs on a highway interrupted by an intersection. These relationships relate the MTR to the flow of vehicles approaching the intersection. This work indicates that a VANET that employs a homogenous transmission range must rely on a higher transmission range than a network of homogeneously distributed nodes to maintain connectivity. | en_US |
| dc.description | To support non-homogenous transmission range, traffic flow models are used to derive an estimate of a vehicle's local density in congested traffic. The vehicle mobility pattern is employed to detect the phase transition from free-flow to congested conditions in the local area surrounding the vehicle. The vehicles' ability to estimate their local density and detect traffic conditions is used to develop the Dynamic Transmission Range Assignment (DTRA) algorithm. The DTRA algorithm sets the transmission range of a vehicle dynamically as the density of vehicles surrounding it changes. The proposed scheme does not require any global information such as vehicle locations, nor does it require any exchange of information among vehicles. The IEEE 802.11 protocol is modified so that each vehicle can determine its own transmission range based on the DTRA algorithm. | en_US |
| dc.description | Thesis (Ph.D.)--Dalhousie University (Canada), 2006. | en_US |
| dc.language | eng | en_US |
| dc.publisher | Dalhousie University | en_US |
| dc.publisher | | en_US |
| dc.subject | Mathematics. | en_US |
| dc.subject | Engineering, General. | en_US |
| dc.title | Modelling of transmission range in vehicular ad hoc networks. | en_US |
| dc.type | text | en_US |
| dc.contributor.degree | Ph.D. | en_US |
