Efficient discovery of Internet gateways in future vehicular communication systems

Bechler, Marc; Wolf, Lars; Storz, Oliver; Franz, Walter J.

doi:10.1109/vetecs.2003.1207769

Cited by 57 publications

(29 citation statements)

References 2 publications

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“…The second scenario assumes a vehicle driving on the left lane at a higher speed resulting in overtaking maneuvers and, thus, a more [1] that has the following characteristics: 588 kbit/s (shared) link layer bandwidth, 40 ms delay, 1 % IP packet error rate per link, and 1 % duplicates, symmetrical communication. On the network layer, we assumed the overhead caused by an optimized gateway discovery protocol for VANETs [16] and a respective mobility protocol for VANETs described in [ 19]. Thereby, the available bandwidth is shared equally among 27 communicating vehicles, resulting in 21.57 kbit/s on average per vehicle.…”

Section: Discussionmentioning

confidence: 99%

An Optimized TCP for Internet Access of Vehicular Ad Hoc Networks

Bechler

Jaap

Wolf

2005

NETWORKING 2005. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

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Abstract. Communication eciency at the transport layer is of specic importance for ad hoc networks. Especially in vehicular ad hoc networks, vehicles will have a temporary and rather short-lived connectivity to the Internet, which has to be utilized eciently. In this paper, we propose a TCP-based transport protocol called MCTP that is optimized for the Internet access in vehicular environments. Therefore, MCTP is combined with split performance enhancing proxy architectures, where a proxy separates the end-to-end TCP connection. This enables the deployment of optimized transport protocols while maintaining interoperability with TCP used in the Internet. For the evaluation, we emulated the communication characteristics of a typical vehicular scenario. This clearly shows the advantages of MCTP over traditional approaches; the overall data throughput is signicantly higher when MCTP is used for communication between vehicle and proxy. The evaluation also emphasizes the usefulness of performance enhancing proxies in vehicular environments.

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Section: Discussionmentioning

confidence: 99%

An Optimized TCP for Internet Access of Vehicular Ad Hoc Networks

Bechler

Jaap

Wolf

2005

NETWORKING 2005. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

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“…In the other hand, several vehicular hybrid ad hoc networks have been proposed (e.g. [21]), but the studies are also limited to Internet access. In our work, we are interesting in providing a total connectivity between the vehicles (i.e.…”

Section: Vehicular Hybrid Ad Hoc Networkmentioning

confidence: 99%

On the Scalability Problem of Highway Ad Hoc Network

Kaisser

2009

2009 IEEE Wireless Communications and Networking Conference

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Abstract-Vehicular Ad hoc Network in a highway is composed of high speed vehicles or nodes which induce fast topology changes in their configuration. In order to solve the connectivity and scalability problems of VANETs, we introduce the architecture of a Vehicular hybrid ad hoc network (VHANET). Using some routing protocol extensions, the VHANET allows ad hoc islands to be interconnected among each other using a infrastructure network. Our simulation results show that the performances, compared to a flat network, are greatly enhanced. In addition, we study a nearly optimal AP density for the use of our architecture.I. VEHICULAR AD HOC NETWORKS AND ROUTING Vehicular Network is a new capability for drivers to enhance safety on roads and then, to provide Internet access services. Vehicular Networks can be formed either by deployment of a telecommunication network infrastructure or by using Ad Hoc communications between vehicles. In the first case, some access points are distributed along the road, each one connected to other through a wired network allowing the vehicles to connect to the AP (Access Point). The main drawbacks of a complete road coverage are prohibitive costs and inefficient use in case of light traffic. On the other hand, a Vehicular Ad Hoc Network (VANET) is a special kind of Mobile Ad-Hoc Networks (MANET), where vehicles equipped with wireless devices constitute a network without any additional infrastructure.In VANET [1], the vehicles act both as hosts and routers, being either packets source, destination or forwarder. VANET networks can be used for two kinds of applications: safety applications like alert diffusion, road foreseen, and user oriented applications like Internet access, VoIP, file transfers or advertising services. Both types of applications have different constraints in terms of delay, bandwidth and reliability. For user oriented applications, data rate will usually be greater than for safety applications. Safety applications are mainly interested with reliability and delay guarantee. Moreover, we consider safety and user-oriented applications which use unicast communications. For these unicast communications, a routing protocol is required. MANET routing protocols were designed to establish paths even with a dynamic network topology. With VANET, the difficulty comes from the nodes high mobility because the paths have to be more often established and a lot of signaling messages are broadcasted. The second problem comes from the convergence delay which has to be less than the topology change interval in order to achieve an accurate routing process.For these main reasons, several studies have shown that it is not reasonable to use a proactive routing protocol for VANET where the vehicles speed implies a highly dynamic topology. In contrast, either reactive or geographical protocols are more robust to frequent topology changes. Particular routing techniques are thus studied for the VANET [1], [2] but other studies has demonstrated that DSR (Dynamic Source Routing, a reactive ad hoc p...

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“…In the formulation, constraint (1) guarantees that any connection will be assigned to a single network at any time; constraint (2) states that all bandwidth allocated is bounded by the bandwidth capacity of each network; and constraint (3) is used to measure the handover cost of each connection at each stage.…”

Section: Integral Flow Assignment Problemmentioning

confidence: 99%

Handover Cost Optimization in Traffic Management for Multi-homed Mobile Networks

Wang

Yang

et al. 2007

Ubiquitous Intelligence and Computing

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Abstract. In a multi-homed mobile network, the traffic management problem, which is to redistribute the traffic to different available wireless access networks at different geographic areas on a journey, is important and challenging. When a wireless access network is not available in an area, the traffic carried on that wireless access network has to be switched to other wireless access network(s) available in that area, which incurs a handover process associated with certain cost. In this paper, we study the traffic management problem for multi-homed mobile networks with the objective of minimizing the overall handover cost. Two different traffic distribution modes are considered in our study: the Fractional Flow Assignment (FFA) mode which assumes the bandwidth demand from one connection is infinitely splittable and can be assigned to different wireless access networks, and the Integral Flow Assignment (IFA) mode which assumes that at any time the bandwidth demand from each connection can only be assigned to a single wireless network. We show that the general FFA problem and the IFA problem are both NP-hard and propose optimal solutions to the four special cases of the FFA problem and heuristic solutions to the general FFA problem and the IFA problem. Extensive simulations are conducted to verify the impact of the capacity-demand ratio on the performance of the proposed solutions.

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Efficient discovery of Internet gateways in future vehicular communication systems

Cited by 57 publications

References 2 publications

An Optimized TCP for Internet Access of Vehicular Ad Hoc Networks

An Optimized TCP for Internet Access of Vehicular Ad Hoc Networks

On the Scalability Problem of Highway Ad Hoc Network

Handover Cost Optimization in Traffic Management for Multi-homed Mobile Networks

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