Architectures for Information Communication and Technology (ICT) Systems.
In today's world, wireless communication systems and Internet are increasingly becoming interconnected. In order to seamlessly integrate them, concepts for intelligent Information and Communication Technology (ICT) architectures need to be developed. These architectures describe how context-aware systems efficiently provide tailor-made applications and content to the consumer, thereby adhering to the latest standards in terms of Quality of Service, ubiquity, and user privacy. A major conceptual challenge is the incorporation of technical enablers to design scalable, extendable, reliable and secure architectures. Therefore, system modularity is a key design paradigm that, in later stages, also supports a rapid adoption by the market. This in turn, facilitates the achievement of overall objectives satisfying human communication needs in a cost-effective manner..
Business Modeling of ICT Architectures.
The broad scope of design requirements for ICT systems makes the resulting architectures very complex and their individual components interdependent. This is not only a major challenge from a technical perspective but also from a business perspective. Thus, operating and maintaining a modern ICT infrastructure cannot be done by a single company. Rather, it requires a network comprised of both private and public institutions that need to be organized in a way that assures sustainable and stable business relationships. Therefore, designing business models that, besides guaranteeing a financially attractive revenue and cost structure, take into account the technical particularities of ICT systems is a cornerstone in the successful implementation and operation of these systems..
Algebraic Coding and Sequence Design.
Algebraic coding is the art of designing and implementing algebraic codes to solve engineering problems. At our research group we work on these algebraic codes with a focus on communication systems. Our main aim is to understand the mathematical relationships and use them in building intelligent and efficient communication systems. Sequence design is a result of algebraic coding. Sequences are designed and constructed using algebraic concepts. We are currently working on bent sequences, maximal length sequences (m - sequences) and Hadamard sequences..
A system is context-aware if it uses context to provide relevant information and/or services to the user, where relevancy depends on the user's task. Thus context-aware systems are concerned with the acquisition of context (e.g. using sensors to measure temperature), the abstraction and understanding of context (e.g. matching a perceived sensory stimulus to a context), and application behavior based on the recognized context (e.g. triggering actions based on context). However, context-awareness is also regarded as an enabling technology for ubiquitous computing systems, smart spaces and is a key technology for adaptive, device and network independent multimedia services. So context-aware systems should have the ability of collecting, processing and providing inferred results to applications in distributed systems.
At our research group we develop infrastructure that supports gathering of context information from different sensors, representing the gathered context with a unified model that can cover a wide variety of possible contexts and distribution of this context over specified interfaces.
Multi-Radio Network Simulator.
Our research group investigates major wireless communications standards, as e.g. UMTS, HSPA, LTE, WiMAX, WLAN etc., as well as potential candidates for future wireless communication systems. In particular, our research focuses on developing evaluation methods and simulators for future multi-radio systems. Furthermore, concepts for optimum network selection, load balancing and system capacity optimisation in multi-system scenarios are investigated and evaluated.