The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We study the behaviour of packet delays and inter-forwarding times in vehicular networks utilizing opportunistic communication protocols. Our results are obtained through an extensive simulation campaign employing realistic models of vehicular mobility and scenarios derived from real urban environments. We also explore the impact of different forwarding strategies and traffic types on the results...
Delay tolerant ad-hoc networks leverage the mobility of relay nodes to compensate for lack of permanent connectivity and thus enable communication between nodes that are out of range of each other. To decrease delivery delay, the information to be delivered is replicated in the network. Our objective in this paper is to study a class of replication mechanisms that include coding in order to improve...
This paper characterizes the throughput-delay tradeoffs in mobile ad hoc networks (MANETs) with network coding, and compares results in the situation where only replication and forwarding are allowed in each node. The schemes/protocols achieving those tradeoffs in an effective and decentralized way are proposed and the optimality of those tradeoffs is established. The scenarios in which network coding...
Routing in delay tolerant networks (DTNs) is a challenging problem in networking research. Existing DTN routing solutions have used many approaches to increase the success rate of message delivery, such as meeting probabilities between nodes, packet replication and flooding. One important feature of these protocols is using local connection information to find the ldquobestrdquo path with high likelihood...
Energy conservation is a critical issue regarding wireless mobile ad hoc networks, since the nodes are battery restrained and the depletion of their power defines the lifetime of the network. This paper presents the PAST-EnDRoP: position aided spatial TDMA (PA-STDMA) MAC protocol with Energy and delay constrained routing for mobile ad hoc networks. It is a novel approach designed for optimized channel...
The diversification of wireless communication usage has been proceeding rapidly with the diffusion of cellular phones, WiFi and WiMAX. In the emerging wireless communication environments, diverse wireless systems coexist. On the other hand, there is increasing concern that the growing use of wireless systems will exhaust the finite wireless resources. To solve this problem, we aim to optimize the...
QoS guarantee in mobile ad hoc network is a challenging problem and has received much attention. Although the access policy with reservation of TDMA can support some QoS services, the extra delay introduced by its time multiplexed communication make it can not be adapted to large scale network. To solve the problem, we propose a heuristic optimal delay routing algorithm which chooses delay as the...
Due to their dynamic topologies, providing quality of service (QoS) in wireless ad hoc networks introduces major new challenges to the research community. Now, the commercially available ad-hoc network products are those based on the IEEE802.11 Distributed Coordination Function (DCF). Cooperative communications fully leverages the broadcast nature of the wireless channel and spatial diversity, thereby...
This paper reports the studies related to scalability of network size on our newly proposed routing protocol, genetic zone routing protocol (GZRP) for mobile ad hoc networks (MANETs). This protocol applies genetic algorithms (GA) to zone routing protocol (ZRP) for finding a limited set of multiple alternative routes to the destinations, in order to provide load balancing and fault tolerance during...
Wearable computers need networking by using wireless ad hoc network in order to utilize them more effectively, routing protocol becomes an important research field for its significance in wireless ad hoc network. In Ad Hoc network, there are mainly two kinds of routing protocols: proactive routing protocol and on-demand routing protocol, to evaluate the performance of two kinds of protocols, we choose...
Mobile ad hoc network (MANET) is a multi-hop temporary autonomous system of mobile nodes with wireless transmitters and receivers without the aid of pre-established network infrastructure. With the development of network and demand of users, QoS has become one of the focus issues. A new routing protocol is proposed in this paper, which can provide QoS guarantee. In the route discovery phase, it finds...
Wireless mesh networks (WMNs) have recently gained a lot of popularity due to their rapid deployment and instant communication capabilities. However, as a key technology for next-generation wireless networking, WMNs lack suitable routing metrics and protocol for new features. Currently, AODV is the routing protocol used in WMNs. This paper proposes an ants-in-mesh (AIM) routing protocol for wireless...
In this paper, we analyze the impact of physical propagation model on the performance of ad-hoc network routing protocols. The impact of different propagation environments on a typical routing protocol such as OLSR is presented through simulations. A log-distance path loss model is used to model two different environments: open_environment characterized by open area and city_environment characterized...
The task of finding and sustaining routes in mobile ad-hoc networks (MANETS) is an important factor in determining the efficiency of any MANET protocol. MANET characteristically comprises of wireless mobile hosts whose communication with each other is devoid of any fixed infrastructure. Absence of fixed infrastructures and host mobility thus constitute frequent unpredictable topological views. Positional...
For mobile ad-hoc wireless network, the route protocol is very important. This paper proposes a modified CBRP scheme based on the cloud model to improve the performance. And some experiments are conducted, the results show that the ad-hoc network will be lower average end-to-end delay and higher packet delivery ratio with the proposed scheme.
In many wireless ad-hoc networks it is important to find a route that delivers a message to the destination within a certain deadline (delay constraint). We propose to identify such routes based on average channel state information (CSI) only, since this information can be distributed more easily over the network. Such cases allow probabilistic QoS guarantees i.e., we maximize and report the probability...
We describe wireless network utility maximization, WNUM, and compare its performance to traditional NUM along the dimensions of rate, delay and reliability under flat fading. Both coded and uncoded links are considered as are networks with interfering links. In each case, WNUM is shown to offer superior performance in simulations operating under Rayleigh fading due to its ability to adapt to changing...
Broadcasting is a vital operation in mobile ad hoc networks (MANETs) and it is crucial to enhance its efficiency to ensure successful deployment. Although flooding is ideal for broadcast operations due to its simplicity and high reachability it suffers from high packet collision which can degrade network performance severely. Counter-based broadcast schemes have been introduced to alleviate the limitations...
Wireless sensor networks (WSNs) are becoming a viable tool for many monitoring applications. In many cases these applications may be of critical nature where the transmitting of vital information from sensors to base station or sink is crucial, and data loss cannot be tolerated. As a result, the information transmission of wireless sensor networks has various different requirements in performance,...
A random routing scheme is proposed for mobile ad-hoc networks of non-real-time services. When packet transmission takes place, the intermediate relay nodes between the source node and the destination node are not known a priori. Through network control signaling, the relay nodes are determined by estimating the physical layer parameters, specifically the link quality between the source and the possible...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.