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The advances in wireless communication technologies and the proliferation of mobile devices have enabled the realization of intelligent environments for people to com- nicate with each other, interact with information-processing devices, and receive a wide range of mobile wireless services through various types of networks and systems everywhere, anytime. This «Internet of Things» will dramatically modify our lives allowing progress in various domains such as health, security, and ITS (intelligent transportation systems). A key enabler of this pervasive and ubiquitous connectivity environment is the - vancement of software technology in various communication sectors, ranging from communication middleware and operating systems to networking protocols and app- cations. The international conference series on Mobile Wireless Middleware, Oper- ing Systems, and Applications (MOBILWARE) is dedicated to addressing emerging topics and challenges in various mobile wireless software-related areas. The scope of the conference includes the design, implementation, deployment, and evaluation of middleware, operating systems, and applications for computing and communications in mobile wireless systems. MOBILWARE 2009 was the second edition of this conference, which was made possible thanks to the sponsorship of ICST and Create-Net and most importantly the hard work of the TPC and reviewers.

Inhaltsverzeichnis

Frontmatter

A Base Solution for Exposing IMS Telecommunication Services to Web 2.0 Enabled Applications

Abstract
The convergence of telecommunication and Web 2.0 services is leading to new opportunities for the telecommunications market. Companies are looking for ways to include their services in Web 2.0 applications. Predictions suggest that future telecommunication networks will be based on the IP Multimedia Subsystem (IMS), an all IP telecommunication core network. This paper describes an approach to combining Web 2.0 enabled applications, namely widgets, with telecommunication features using IMS. Widgets are small applications based on Web technologies that run on the client device. A new abstraction layer with interfaces for the different telecommunication features will be introduced. In addition a widget engine that makes these telecommunication interfaces available to its widgets will be presented. This will allow the rapid development of IMS applications for external developers and the combination of other Web 2.0 services with IMS features.
Florian Deinert, Alin Murarasu, Andreas Bachmann, Thomas Magedanz

FINDR: Low-Cost Indoor Positioning Using FM Radio

Abstract
This paper presents an indoor positioning system based on FM radio. The system is built upon commercially available, short-range FM transmitters. The features of the FM radio which make it distinct from other localisation technologies are discussed. Despite the low cost and off-the-shelf components, the performance of the FM positioning is comparable to that of other positioning technologies (such as Wi-Fi). From our experiments, the median accuracy of the system is around 1.3 m and in 95% of cases the error is below 4.5 m.
Andrei Papliatseyeu, Niko Kotilainen, Oscar Mayora, Venet Osmani

IEEE 802.21 Assisted Seamless and Energy Efficient Handovers in Mixed Networks

Abstract
Network selection is the decision process for a mobile terminal to handoff between homogeneous or heterogeneous networks. With multiple available networks, the selection process must evaluate factors like network services/conditions, monetary cost, system conditions, user preferences etc. In this paper, we investigate network selection using a cost function and information provided by IEEE 802.21. The cost function provides flexibility to balance different factors in decision making and our research is focused on improving both seamlessness and energy efficiency of handovers. Our solution is evaluated using real WiFi, WiMax, and 3G signal strength traces. The results show that appropriate networks were selected based on selection policies, handovers were triggered at optimal times to increase overall network connectivity as compared to traditional triggering schemes, while at the same time the energy consumption of multi-radio devices for both on-going operations as well as during handovers is optimized.
Huaiyu Liu, Christian Maciocco, Vijay Kesavan, Andy L. Y. Low

Intelligent Middle-Ware Architecture for Mobile Networks

Abstract
Recent advances in electronic and automotive industries as well as in wireless telecommunication technologies have drawn a new picture where each vehicle became “fully networked”. Multiple stake-holders (network operators, drivers, car manufacturers, service providers, etc.) will participate in this emerging market, which could grow following various models. To free the market from technical constraints, it is important to return to the basics of the Internet, i.e., providing embarked devices with a fully operational Internet connectivity (IPv6).
A new device, the Mobile Router (MR), will take place in vehicle to manage mobility and take advantages of the surrounding wireless technology diversity to offer seamless IP connectivity to on-board devices. It has to take into account various constraints, in its decision regarding the management of wireless network interfaces and the routing of the flows. These constraints are many-fold. They could be technical, depend on the environment of the MR or on the flow characteristics. They also have to respect usage policies provided by stake-holders.
This leads to the necessity to design a middle-ware able to gather all kind of information and requirements and to provide the routing engine (at the network layer) with a comprehensive set of elementary rules. This article presents a MR architecture and show how such a middle-ware could make decisions which are context aware and policies aware while allowing a comprehensive resource management.
Rayene Ben Rayana, Jean-Marie Bonnin

Middleware Solutions for Self-organizing Multi-hop Multi-path Internet Connectivity Based on Bluetooth

Abstract
The availability of heterogeneous wireless interfaces and of growing computing resources on widespread portable devices pushes for enabling innovative deployment scenarios where mobile nodes dynamically self-organize to offer Internet connectivity to their peers via dynamically established multi-hop multi-path opportunities. We claim the suitability of novel, mobility-aware, and application-layer middleware based on lightweight evaluation indicators to support the complexity of that scenario, involving heterogeneous wireless technologies over differentiated and statically unpredictable execution environments. To validate these claims, we have implemented an innovative middleware that manages the durability/throughput-aware formation and selection of different multi-hop paths simultaneously. This paper specifically focuses on how our middleware effectively exploits Bluetooth for multi-hop multi-path networking, by pointing out the crucial role of i) compliance with standard solutions to favor rapid deployment over off-the-shelf equipment and ii) the reduction of the usual overhead associated with some expensive Bluetooth operations, e.g., device inquiry. In particular, the paper shows how it is possible, on the one hand, to extend JSR-82 to portably access monitoring indicators for lightweight mobility/throughput estimations and, on the other hand, to reduce the time needed to update the set of available Bluetooth-based connectivity opportunities via approximated and lightweight forms of discovery.
Paolo Bellavista, Carlo Giannelli

Location-Based Botany Guide: A Prototype of Web-Based Tracking and Guiding

Abstract
Wireless positioning technologies make it possible to keep track of mobile devices, and Web technologies make Web applications highly interactive. The combination of them gives rise to location-based Web applications, which generate and deliver Web content tailored to user locations. Location-based Web applications are able to utilize the enormous resources on the Web and allow users to use different location-based services without installing specific software. The paper presents a prototype of Web-based tracking and guiding - the Location-Based Botany Guide, which is a Web-based multimedia guiding system used in botanical gardens for biology students and visitors. The system adopts a general architecture for Web-based tracking and guiding, which consists of the Location Server, the Content Server, the Botanical Guiding Web Server and the clients. Personalization technology is applied to provide the users with personalized recommendations and presentations.
Rui Zhou, Gerhard Schneider

Parallel Data Transfer with Voice Calls for Energy-Efficient Mobile Services

Abstract
Battery consumption is one challenge for mobile applications and services. In this paper we explore the scenario where mobile phones delay the transfer of non-urgent data and perform the communication while a voice call is active. Our measurements show that data transfer during voice call requires only slightly over 10% additional power and that simultaneous voice call slows down the file transfer by 3%-14%. As a result we can save over 80% of energy in data transfer if we can delay the communication to a time when user is speaking at the mobile phone. For a user speaking 26 minutes a day this would allow 50MB of low energy data communication. A large class of applications can delay their data transfer without major effect to the user experience. The power saving mechanism can be implemented either in an application specific fashion or, preferably, at the middleware layer.
Jukka K. Nurminen, Janne Nöyränen

Policy-Based Device and Mobility Management

Abstract
Each new generation of mobile terminals offers more and better functionality, e.g. terminal mobility, multi-homing or inter-device session mobility. Furthermore, the interaction with consumer devices, e.g. DLNA TV or stereo sets, is becoming more common. Every new feature, however, is likely to result in increased complexity for the end user: Most people do not know how to utilize all features of their mobile terminals, hence devices that offer only a reduced feature set are becoming more popular. Additionally, while the end user expects to be in control, the network operator might want to exert some influence over which features are available or trigger actions, e.g. handovers, based on contract, location, etc. The aim of our research is to offer high flexibility and functionality combined with ease of use. We designed a policy management framework for the mentioned session mobility functions which supports the user in the configuration of the functions and automates commonly performed actions.
Pierre Imai, Bernd Lamparter, Marco Liebsch

Policy-Based Middleware for QoS Management and Signaling in the Evolved Packet System

Abstract
The 3GPP are currently finalizing their Evolved Packet System (EPS) with the Evolved Packet Core (EPC) central to this framework. The EPC is a simplified, flat, all IP-based architecture that supports mobility between heterogeneous access networks and incorporates an evolved QoS concept based on the 3GPP Policy Control and Charging (PCC) framework. The IP Multimedia Subsystem (IMS) is an IP service element within the EPS, introduced for the rapid provisioning of innovative multimedia services. The evolved PCC framework extends the scope of operation and defines new interactions – in particular the S9 reference point is introduced to facilitate inter-domain PCC communication. This paper proposes an enhancement to the IMS/PCC framework that uses SIP routing information to discover signaling and media paths. This mechanism uses standardized IMS/PCC operations and allows applications to effectively issue resource requests from their home domain enabling QoS-connectivity across multiple domains. Because the mechanism operates at the service control layer it does not require any significant transport layer modifications or the sharing of potentially sensitive internal topology information. The evolved PCC architecture and inter-domain route discovery mechanisms were implemented in an evaluation testbed and performed favorably without adversely effecting end user experience.
Richard Good, Fabricio Gouveia, Thomas Magedanz, Neco Ventura

Proactive Data Replication Using Semantic Information within Mobility Groups in MANET

Abstract
In this article we propose a distributed data replication algorithm to be used for data sharing in Mobile Ad hoc NETworks (MANETs). Our system replicates data before users access them. To this purpose, it uses a predictive algorithm based on semantic information about the user and the data and previous access patterns. It also aims at creating enough replica to prevent data loss in case a peer unexpectedly disappears or a partition occurs. To this end, we also propose a stable group creation algorithm based on long lasting connectivity. While data sharing systems for MANET already exist, both the use of semantic information and of temporal stability are new in this domain. We illustrate the interest of the proposed algorithms by showing how a wiki service on MANETs would benefit from them.
Hoa Ha Duong, Isabelle Demeure

Scalable Interactive Middleware Components for Ubiquitous Fashionable Computers

Abstract
The middleware for location based interactive applications requires scalability in large scale spaces. As the number of users and target services are increased, the server has to process massive spatial queries and event handling requests efficiently. Our middleware components are developed to extend the U-interactive system for large scale environments. The system manages the location information for large number of users and target objects. In addition the system handles events caused by user commands. We developed efficient tuple indexing and query mechanism by composite keys. As a new spatial query, Fan search is invented to provide efficient target selection by distance and angle. We optimized the query processing by efficient node traversing and data-aware interval skipping. The tuple matching process is performed in bounded time up to 100,000 objects. Fan search with C-Cuve has superior performance than Z-Curve in high density nodes in the experiment.
Gyudong Shim, Kyu Ho Park

SeDeUse: A Model for Service-Oriented Computing in Dynamic Environments

Abstract
The current state-of-the-art in service-oriented computing targets mostly business-to-business interaction, as service directories store business specific instead of general, abstract, interfaces. Moreover, the established coordination models were designed to operate mainly over business processes with immutable, previously known, locations and tightly couple resource awareness and usage, inhibiting the programmer to separate the purpose of the program from its execution environment. In this paper we present SeDeUSe, a model that features novel programming abstractions sustained by a middleware layer that hides the idiosyncrasies of using service-oriented computing in highly dynamic environments.
Hervé Paulino, Carlos Tavares

The Contextual Map - A Context Model for Detecting Affinity between Contexts

Abstract
Context-awareness represents an important research domain in mobile computing by utilizing information about persons, places and objects anytime and anywhere. The highly dynamic contexts created by this paradigm raise questions how to efficiently determine alikeness and affinity between such contexts. Inspired by mechanisms from location-aware computing, we tackle the issue of contextual proximity by constructing an n-dimensional map-model, which serves as a context model for regular context repositories. This Contextual Map enables us to store non-location contexts in a map-based way. Further, this model enables us to conduct location-based n-dimensional proximity detection on the non-location contexts, hence giving us the possibility to determine contextual proximity. This paper introduces the contextual map model, describing how principles from the location-based service domain can be leveraged on general context-aware computing and how they can be employed to detect affinities between different contexts.
Robert Schmohl, Uwe Baumgarten

Extending UPnP QoS Standard for Reducing Response Delay in Multimedia Home Networks

Abstract
A model has been developed to provide an UPnP communication implementation that reduces QoS negotiation delay. The proposed model extends the UPnP QoS Architecture standard by adding status information about the network topology and the established traffic flows. The introduced extensions are compatible to the existing UPnP standard. The implementation has been tested under different conditions and the obtained results confirm that response time can be reduced with respect to the standard architecture of about 60% to 92%. Furthermore, the implementation demonstrates that redundant queries can be avoided while the management and distribution of the multimedia content will be optimized.
Jesús Sáez, Alvaro Reina, Ralf Seepold, Natividad Martínez Madrid

Extending an IMS Client with Peer-to-Peer Content Delivery

Abstract
The increasing demand for mobile applications implies an increase in service availability and content delivery capacities across the networks. Peer-to-peer technologies have proven to be able to deliver media in an effective way to the end user. In this paper, we analyze and describe the necessary extensions and functionalities, which are needed to enable Peer-to-peer content delivery in an IMS client, namely the MONSTER framework. A special focus is directed to the interoperation between existing functional elements and newly developed peer-to-peer components.
Jens Fiedler, Thomas Magedanz, Julius Müller

Digital Terrain Model Interpolation for Mobile Devices Using DTED Level 0 Elevation Data

Abstract
Digital maps provide altitude data for regions on Earth. The amount of data to be processed increases with O(n2) complexity when resolution detail of the map in use increases. As the storage and processing capacity of handheld mobile devices are very limited compared to regular computer systems, the amount of data that can be stored in the device memory is also much less than of more complex computer systems. DTED Level 0 data provides approximately 1km resolution of elevation data which requires smaller storage space. The points in between the sampled points can be interpolated making use of the interpolation algorithms, with the addition of two sets of extra points whose coordinates are determined according to the existing sample points.
Murat Ozyurt, Tuna Tugcu, Fatih Alagoz

A Mission Management Framework for Unmanned Autonomous Vehicles

Abstract
Unmanned Autonomous Vehicles (UAVs) are increasingly deployed for missions that are deemed dangerous or impractical to perform by humans in many military and disaster scenarios. UAVs in a team need to operate in sub-groups or independently to perform specific tasks, but still synchronise state information regularly and cope with intermittent communication failures as well as permanent UAV failures. This paper describes a failure management scheme that copes with failures, which may result in disjoint sub-networks within the team. A communication management protocol is proposed to control UAVs performing disconnected individual operations, while maintaining the team’s structure by trying to ensure that all members of the mission rendezvous to communicate at intermittent intervals. The evaluation of the proposed approaches shows that the schemes are scalable and perform significantly better than similar centralised approaches.
Eskindir Asmare, Anandha Gopalan, Morris Sloman, Naranker Dulay, Emil Lupu

A Quality of Context-Aware Approach to Access Control in Pervasive Environments

Abstract
The widespread diffusion of wireless-enabled portable devices creates novel opportunities for users to share resources anywhere and anytime, but makes access control a crucial issue. User/device mobility and heterogeneity, together with network topology and conditions variability, complicate access control and call for novel solutions to dynamically adapt access decisions to the different operating conditions. Several research efforts have emerged in recent years that propose to exploit context-awareness to control access to resources based on context visibility and changes. Context-based access control requires, however, to take into account the quality of context information used to drive access decisions (QoC). Quality of context has in fact a profound impact on the correct behavior of any context-aware access control framework. Using context information with insufficient quality might increase the risk of incorrect access control decisions, thus leading to dangerous security breaches in resource sharing. In this paper we propose a QoC-aware approach to access control for anywhere, anytime resource sharing. The paper describes the design, implementation and evaluation of the Proteus policy framework, which combines two design guidelines to enable dynamic adaptation of policies depending on context changes: context-awareness with QoC guarantees and semantic technologies to allow high-level description of context/policy specification and reasoning about context/policies.
Alessandra Toninelli, Antonio Corradi, Rebecca Montanari

A Service-Oriented Framework Supporting Ubiquitous Disaster Response

Abstract
The synergy of ubiquitous computing and service-oriented technologies may lead to efficient, pervasive and dependable solutions in the challenging context of emergency management. Recently, novel paradigms have been proposed, most of them envisioning arbitrary pairs of peer application entities communicating and providing services directly with each other and to users. In order to enforce these paradigms even to systems which include devices with limited processing and storage resources, lightweight middleware components are required. We illustrate how this is provided by JXTA-SOAP, a portable software component supporting peer-to-peer sharing of Web Services, and we show how it can be used to implement disaster response software applications.
Michele Amoretti, Maria Chiara Laghi, Gianni Conte

An Analysis of Navigation Algorithms for Smartphones Using J2ME

Abstract
Embedded systems are considered one of the most potential areas for future innovations. Two embedded fields that will most certainly take a primary role in future innovations are mobile robotics and mobile computing. Mobile robots and smartphones are growing in number and functionalities, becoming a presence in our daily life. In this paper, we study the current feasibility of a smartphone to execute navigation algorithms. As a test case, we use a smartphone to control an autonomous mobile robot. We tested three navigation problems: Mapping, Localization and Path Planning. For each of these problems, an algorithm has been chosen, developed in J2ME, and tested on the field. Results show the current mobile Java capacity for executing computationally demanding algorithms and reveal the real possibility of using smartphones for autonomous navigation.
André C. Santos, Luís Tarrataca, João M. P. Cardoso

An IMS-Based Middleware Solution for Energy-Efficient and Cost-Effective Mobile Multimedia Services

Abstract
Mobile multimedia services have recently become of extreme industrial relevance due to the advances in both wireless client devices and multimedia communications. That has motivated important standardization efforts, such as the IP Multimedia Subsystem (IMS) to support session control, mobility, and interoperability in all-IP next generation networks. Notwithstanding the central role of IMS in novel mobile multimedia, the potential of IMS-based service composition for the development of new classes of ready-to-use, energy-efficient, and cost-effective services is still widely unexplored. The paper proposes an original solution for the dynamic and standard-compliant redirection of incoming voice calls towards WiFi-equipped smart phones. The primary design guideline is to reduce energy consumption and service costs for the final user by automatically switching from the 3G to the WiFi infrastructure whenever possible. The proposal is fully compliant with the IMS standard and exploits the recently released IMS presence service to update device location and current communication opportunities. The reported experimental results point out that our solution, in a simple way and with full compliance with state-of-the-art industrially-accepted standards, can significantly increase battery lifetime without negative effects on call initiation delay.
Paolo Bellavista, Antonio Corradi, Luca Foschini

Announcement/Subscription/Publication: Message Based Communication for Heterogeneous Mobile Environments

Summary
Many tasks in smart environments can be implemented using message based communication paradigms that decouple applications in time, space, synchronization and semantics. Current solutions for decoupled message based communication either do not support message processing and thus semantic decoupling or rely on clearly defined network structures. In this paper we present ASP, a novel concept for such communication that can directly operate on neighbor relations between brokers and does not rely on a homogeneous addressing scheme or anymore than simple link layer communication. We show by simulation that ASP performs well in a heterogeneous scenario with mobile nodes and decreases network or processor load significantly compared to message flooding.
Henry Ristau

Building a Personal Symbolic Space Model from GSM CellID Positioning Data

Abstract
The context in which a person uses a mobile context-aware application can be described by many dimensions, including the, most popular, location and position. Some of the data used to describe these dimensions can be acquired directly from sensors or computed by reasoning algorithms. In this paper we propose to contextualize the mobile user of context-aware applications by describing his/her location in a symbolic space model as an alternative to the use of a position represented by a pair of coordinates in a geometric absolute referential. By exploiting the ubiquity of GSM networks, we describe a method to progressively create this symbolic and personal space model, and propose an approach to compute the level of familiarity a person has with each of the identified places. The validity of the developed model is evaluated by comparing the identified places and the computed values for the familiarity index with a ground truth represented by GPS data and the detailed agenda of a few persons.
Filipe Meneses, Adriano Moreira

Chapar: A Cross-Layer Overlay Event System for MANETs

Abstract
In this paper, we present Chapar, an event system designed for mobile ad hoc networks that supports the publish-subscribe model as well as point-to-point and point-to-multipoint message sending. Chapar supports event persistency to resist transient disconnections and network partitioning. Following a cross-layer approach, Chapar is designed as an overlay network that uses the Multipoint Relays (MPRs) defined in OLSR as distributed brokers, and uses the OLSR routing table to disseminate the events. It therefore benefits from the way OLSR handles topology changes. The implementation performance is promising in the sense that no extra signaling is generated by mobility support and the generated overlay traffic is considerably less than the underlying routing protocol.
Amir R. Khakpour, Isabelle Demeure

Context Aware Multiparty Session Support for Adaptive Multicasting in Heterogeneous Mobile Networks

Abstract
The paper addresses the issue of achieving context-aware, adaptive multiparty sessions in a heterogeneous system by illustrating how to add elements of adaptivity and context-awareness to the session management functionality of such systems. The effective usage of situation/context information can lead to context-aware content casting, especially context-aware, adaptive multicasting. Therefore, regarding the multicast service, the key functionality of the enhanced session management is to create network subgroups based on network information as well as general user and environment context information to the extent that these are considered necessary for forming network-efficient groups, and in turn communicating the characteristics of these subgroups in the form of content stream descriptions to the media delivery function for obtaining the appropriate content for each subgroup.
Josephine Antoniou, Christian Riede, Filipe Cabral Pinto, Andreas Pitsillides

Context Inference for Mobile Applications in the UPCASE Project

Abstract
The growing processing capabilities of mobile devices coupled with portable and wearable sensors have enabled the development of context-aware services tailored to the user environment and its daily activities. The problem of determining the user context at each particular point in time is one of the main challenges in this area. In this paper, we describe the approach pursued in the UPCASE project, which makes use of sensors available in the mobile device as well as sensors externally connected via Bluetooth. We describe the system architecture from raw data acquisition to feature extraction and context inference. As a proof of concept, the inference of contexts is based on a decision tree to learn and identify contexts automatically and dynamically at runtime. Preliminary results suggest that this is a promising approach for context inference in several application scenarios.
André C. Santos, Luís Tarrataca, João M. P. Cardoso, Diogo R. Ferreira, Pedro C. Diniz, Paulo Chainho

Design, Implementation and Case Study of WISEMAN: WIreless Sensors Employing Mobile AgeNts

Abstract
We describe the practical implementation of Wiseman: our proposed scheme for running mobile agents in Wireless Sensor Networks. Wiseman’s architecture derives from a much earlier agent system originally conceived for distributed process coordination in wired networks. Given the memory constraints associated with small sensor devices, we revised the architecture of the original agent system to make it applicable to this type of networks. Agents are programmed as compact text scripts that are interpreted at the sensor nodes. Wiseman is currently implemented in TinyOS ver. 1, its binary image occupies 19Kbytes of ROM memory, and it occupies 3Kbytes of RAM to operate. We describe the rationale behind Wiseman’s interpreter architecture and unique programming features that can help reduce packet overhead in sensor networks. In addition, we gauge the proposed system’s efficiency in terms of task duration with different network topologies through a case study that involves an early-fire-detection application in a fictitious forest setting.
Sergio González-Valenzuela, Min Chen, Victor C. M. Leung

Developing and Benchmarking Native Linux Applications on Android

Abstract
Smartphones get increasingly popular where more and more smartphone platforms emerge. Special attention was gained by the open source platform Android which was presented by the Open Handset Alliance (OHA) hosting members like Google, Motorola, and HTC. Android uses a Linux kernel and a stripped-down userland with a custom Java VM set on top. The resulting system joins the advantages of both environments, while third-parties are intended to develop only Java applications at the moment.
In this work, we present the benefit of using native applications in Android. Android includes a fully functional Linux, and using it for heavy computational tasks when developing applications can bring in substantional performance increase. We present how to develop native applications and software components, as well as how to let Linux applications and components communicate with Java programs. Additionally, we present performance measurements of native and Java applications executing identical tasks.
The results show that native C applications can be up to 30 times as fast as an identical algorithm running in Dalvik VM. Java applications can become a speed-up of up to 10 times if utilizing JNI.
Leonid Batyuk, Aubrey-Derrick Schmidt, Hans-Gunther Schmidt, Ahmet Camtepe, Sahin Albayrak

Towards an Opportunistic and Location-Aware Service Provision in Disconnected Mobile Ad Hoc Networks

Summary
Opportunistic networking has recently appeared as a promising method to support communication in disconnected mobile ad hoc networks. This new communication model relies on the “store, carry and forward” principle, and exploits ad hoc communication and device mobility in order to achieve a network-wide message dissemination. It allows nomadic people to communicate together without resorting to infrastructure-based networks and to have access to services offered by infostations even if they are not in the area covered by these devices. Nevertheless, to be efficient this model requires to guide the message propagation using contextual information, and especially location information.
In this paper, we present the middleware solution we have defined in order to support the provision of location-aware application services in disconnected mobile ad hoc networks using opportunistic communications.
Salma Ben Sassi, Nicolas Le Sommer

Erratum to: MobileWireless Middleware, Operating Systems, and Applications

Abstract
Erratum to: C. Giannelli (Ed.) MobileWireless Middleware, Operating Systems, and Applications DOI: 10.​1007/​978-3-642-01802-2
The book was inadvertently published with an incorrect name of the copyright holder. The name of the copyright holder for this book is: © ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering. The book has been updated with the changes.
Jean-Marie Bonnin, Carlo Giannelli, Thomas Magedanz

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