Geographic routing algorithms for ad-hoc networks exhibit better scalability compared to topology-based routing algorithms. However, geographic routing algorithms assume a cooperative network setting for ad-hoc networks. In this paper, we present TGF, a truthful geographic forwarding algorithm for ad-hoc networks that consist of selfish nodes. These selfish nodes forward data packets from other...

One of the common underlying assumptions in IEEE 802.11 standards' ad hoc mode operations is that all stations in the same IBSS can hear each other directly. In other words, the ad hoc mode of 802.11 supports only single-hop ad hoc networks. When extended to multi-hop environments, IEEE 802.11 protocols show a poor performance, if they are able to work at all. This has been acknowledged by rese...

Multi-hop wireless networks (such as ad-hoc or sensor networks) consist of sets of mobile nodes without the support of a pre-existing fixed infrastructure. For the purpose of scalability, ad-hoc and sensor networks may both need to be organized into clusters and require some protocols to perform common global communication patterns and particularly for broadcasting. In a broadcasting task, a so...

Wireless mobile communications technology has been evolving rapidly in the past decade. The number of mobile subscribers has reached 2 billions and is expected to reach 3 billions by the end of 2010. Most countries have already deployed or have started to deploy the third generation (3G) wireless cellular networks. In 3G, in addition to traditional voice service, users are provided with multi-m...

Medium access control (MAC) in wireless ad hoc networks has received considerable attention for almost a couple of decades; however, there are still open problems which deserve thorough study in order to facilitate migration to the next generation broadband wireless communication systems. In ad hoc networks, a detected frame collision can be due to the so-called unreachability problem, where th...

Network wide broadcasting is a fundamental operation in ad hoc networks. In broadcasting, a source node sends a message to all the other nodes in the network. Unlike in a wired network, a packet transmitted by a node in ad hoc wireless network can reach all neighbors. Therefore, the total number of transmissions (Forwarding nodes) used as the cost criterion for broadcasting. The broadcast opera...

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 networks are self-organizing multi-hop wireless networks, where all the nodes take part in the process of forwarding packets. Ad-Hoc networks can quickly and inexpensively be set up as needed since they do not require any fixed infrastructure, such as base stations or routers. Therefore, they are highly applicable in many fields such as emergency deployments and community networ...

— Ad hoc networks formed without the aid of any established infrastructure are typically multi-hop networks. Location dependent contention and " hidden terminal " problem make priority scheduling in multi-hop networks significantly different from that in wireless LANs. Most of the prior work related to priority scheduling addresses issues in wireless LANs. In this paper, priority scheduling in ...

Adaptive Quality of Service for Wireless Ad hoc Networks Seoung-Bum Lee This thesis contributes toward the design of a new adaptive quality of service (QOS) paradigm for wireless ad hoc networks. We address some of the key performance problems in the broader realm of wireless ad hoc networks, including mobile ad hoc networks and emerging wireless ad hoc sensor networks. Wireless ad hoc networks...