heretofore several position-based routing protocols have been developed for mobile ad hoc networks. many of these protocols assume that a location service is available which provides location information on the nodes in the network.our solutions decrease location update without loss of query success rate or throughput and even increase those.simulation results show that our methods are effectiv...

Ad hoc wireless multi-hop networks (AHWMNs) are communication networks that consist of wireless nodes, placed together in an ad hoc manner, i.e. with minimal prior planning. All nodes in the network have routing capabilities and forward data packets for other nodes in multi-hop fashion. AHWMNs pose substantially different challenges to routing protocols than more traditional wired networks. AHW...

VANETs (Vehicular Ad hoc Networks) are highly mobile wireless ad hoc networks and will play an important role in public safety communications and commercial applications. Routing of data in VANETs is a challenging task due to rapidly changing topology and high speed mobility of vehicles. Conventional routing protocols in MANETs (Mobile Ad hoc Networks) are unable to fully address the unique cha...

Position-based routing is a promising technology for VANET. And location service is the fundamental component for the success of position-based routing. A map-based location service algorithm is proposed in this paper. It uses a predesigned hash function to map a node to a certain location, where location servers are recruited. Hence any node in the network can find location servers of others, ...

Position-based routing algorithms use the geographic position of the nodes in a network to make the forwarding decisions. Recent research in this field primarily addresses such routing algorithms in two dimensional (2D) space. However, in real applications, nodes may be distributed in three dimensional (3D) environments. In this paper, we propose several randomized position-based routing algori...

Privacy is needed in ad hoc networks. An ad hoc on-demand position-based private routing algorithm, called A02P, is proposed for communication anonymity. Only the position of the destination is exposed in the network for route discovery. To discover routes with the limited routing information, a receiver contention scheme is designed for determining the next hop. pseudo identifiers are used for...

In VANETs, vehicles as nodes are self-organized and inter-communicated without centralized authority. The topology formed by vehicles changes quickly, which makes routing become instability. Position-based routing, compared with traditional routing, is more scalable and feasible. Thus it has been proven stabler for VANETs than conventional routing. However, the frequently changed topology and n...

Vehicular Ad-hoc Network (VANET) represents a challenging class of mobile ad-hoc networks that enables vehicles to intelligently communicate with each other and with roadside infrastructure. Routing of data in a vehicular ad hoc network is a challenging task due to the changing topology of such a network. In case of highway traffic position-based routing approaches can very well deal with the h...

Research on the Vanet system always has its own challenges and obstacles. The communication between nodes is certainly main problem that faced. model concept in routing protocol process a very decisive choice to get good quality. Four categories vanet topology, namely position based protocols, broadcast cluster protocols multicast/geocast have fundamental differences, especially of sending data...

Vehicular Ad hoc Network (VANET) is a wireless network that is formed on the fly between a collection of cars connected by wireless links. VANET has gained a great amount of attention during recent years and is used for a large number of safety (accident warning, weather notification) and non-safety (multimedia, gaming) applications. Vehicular Network is one of the most growing type of wireless...