MOBIHOC

The MAC layer implementation of today's commodity 802.11 wire-less network devices cannot easily be changed. But many cross-layer protocols for MANETs rely on a modified MAC layer. Therefore it is hard to test such protocols in real world environments. ...

In this paper, we experimentally investigate the physical layer capture effect in off-the-shelf 802.11 network cards and confirm that it reduces throughput fairness of traffic flows. We then study the feasibility of using the following PHY and MAC layer ...

Efficient routing in wireless mesh networks is a fundamental issue to be addressed in order to boost real deployments bywireless Internet Service Providers (ISP). In last years, research has shown, mainly by simulation, that a cross-layerdesign can ...

The use of multiple wireless channels has been advocated as one approach for enhancing network capacity. In many scenarios, hosts will be equipped with fewer radio interfaces than available channels. Under these scenarios, several protocols, which ...

Validation of mobile ad hoc network protocols relies almost exclusively on simulation. The value of the validation is, therefore, highly dependent on how realistic the movement models used in the simulations are. Since there is a very limited number of ...

The impact of mobility on the link and route lifetimes in ad hoc networks is of major importance for the design of efficient MAC and network layer protocols. Up to now, no real-life measurements were used to study the effect of node mobility on link and ...

Context aware systems are the order of the day. With the advent of low cost sensor networks and systems ambient intelligence is becoming more and more sought after feature. In this work, we present an Online Person Tracking (OPT) system for indoor ...

In this paper, we analyze a year long wireless network users' mobility trace data collected on ETH Zurich campus. Unlike earlier work in [4,18], we profile the movement pattern of wireless users and predict their locations. More specifically, we show ...

We present TWIST, a scalable and exible testbed architecture for indoor deployment of wireless sensor networks. The design of TWIST is based on an analysis of typical and desirable use-cases. It provides basic services like node configuration, network-...

This paper introduces SpeckMAC, a novel low-power distributed, unsynchronised, random-access MAC protocol for a wireless mobile ad-hoc network of miniature specks called specknet. Two variations of the SpeckMAC protocol were compared theoretically with ...

Routing in sensor networks maintains information on neighbor states and potentially many other factors in order to make informed decisions. Challenges arise both in (a) performing accurate and adaptive information discovery and (b) processing/analyzing ...

Many emerging sensor network applications involve mobile nodes with communication patterns requiring any-to-any routing topologies. We should be able to build upon the MANET work to implement these systems. However, translating these protocols into real ...

This paper presents the design and implementation of a unique multi-radio Wireless Sensor Network (WSN) platform compared to current WSN nodes that have only one radio interface. Four independent, low energy radio transceivers allow simultaneous ...

Real world MANET routing protocol implementations generally use layer three mechanisms for carrying out connectivity maintenance tasks. In many cases, such mechanisms are based on periodical transmission of Hello messages. When topology changes occur ...

Over the last few years we have deployed several ad hoc network test beds in France Telecom R&D premises. These test beds aim at understanding the behavior of ad hoc networks under realistic scenarios. They also provide accurate and understandable ...

Due to the fact that the MAC layer of commodity 802.11 wire-less network devices is usually realized in a proprietary firmware module, it is difficult to conduct real world evaluations of novel MANET cross-layer protocols that require a modified MAC ...

Today's powerful networked personal computing devices offer a solid technical basis for mobile ad-hoc networking in support of consumer applications independent of operator networks. However,running Internet protocols directly on top ad-hoc routing ...

Despite the large amount of research performed on wireless networking, test-beds are still limited in number and size. This paper shows the results of our efforts in building and deploying a test-bed, using the Wireless Mesh Net-work (WMN) architecture. ...

The heterogeneity and dynamics in terms of hardware and software configurations is steadily increasing in sensor networks. Therefore, software management is becoming one of the most prominent challenges in this domain. We developed a profile-based ...

The size and dynamics of modern network environments prohibit the application of protocols in large flat networks due to their inability to scale. Hierarchy has proven a successful scaling tool, dividing the network into multiple subsets (domains), ...

Context aware systems are the order of the day. With the advent of low cost sensor networks and systems ambient intelligence is becoming more and more sought after feature. In this work, we present an Online Person Tracking (OPT) system for indoor ...

This paper describes a physical test-bed for evaluating the performance of MAC and networking algorithms targeted at a network of specks called the specknet. The Perspeckz-64 is a workbench available to researchers to conduct experiments remotely on an ...

This paper presents a method for reliably collecting data events from sensors and forwarding the data via a MANET to sensor monitoring stations located on an external network. A the core is a MANET concept that consists of ground and unmanned aircraf ...

Traditionally, global network mobility problem is addressed at networking layer. However, none of these solution is designed for supporting seamless horizontal and vertical handover. The demonstrated solution, called WiOptiMo, provides always-on, ...

We present Worldsens, a complete environment for fast prototyping of wireless sensor protocols and applications. Our environment proposes a full simulation platform with both embedded software instruction and radio packet accuracy. We propose a ...