Markus Dillinger

Investigation of radio resource scheduling in WLANs coupled with 3G cellular network

In this article, based on the overview of network coupling structure between radio access technologies, the concept of joint radio resource management built onto the reference structure is introduced. In order to optimize usage of radio resource and jointly designed from the user perspective, a joint scheduling mechanism allowing traffic to be split over a tightly coupled radio network supported by an adaptive radio multihoming approach is deliberately discussed. With respect to the time-division access scheme in HIPERLAN/2, which is selected as one example of WLAN, algorithms and performance of traffic scheduling in such a radio access technology are given. The required synchronization scheme supporting traffic splitting is also introduced.

Enabling Real-Time Context-Aware Collaboration through 5G and Mobile Edge Computing

Creating context-aware ad hoc collaborative systems remains to be one of the primary hurdles hampering the ubiquitous deployment of IT and communication services. Especially under mission-critical scenarios, these services must often adhere to strict timing deadlines. We believe empowering such realtime collaboration systems requires context-aware application platforms working in conjunction with ultra-low latency data transmissions. In this paper, we make a strong case that this could be accomplished by combining the novel communication architectures being proposed for 5G with the principles of Mobile Edge Computing (MEC). We show that combining 5G with MEC would enable inter- and intra-domain use cases that are otherwise not feasible.

Reconfigurable mobile communications: compelling needs and technologies to support reconfigurable terminals

To date, research into reconfigurable mobile communications has predominantly focussed on the software radio concept, and specifically on the hardware technologies required to move physical layer processing into a programmable environment. Although an interesting and necessary challenge, this only represents a fraction of the overall support and technology required to realise the potential of the concept. Other necessary developments include network/terminal cooperation for seamless inter-standard handoff, QoS management, a secure software download mechanism, terminal software architecture supporting reconfiguration, configuration management, capability negotiation. Summarising results from early IST-TRUST (Transparently Reconfigurable Ubiquitous terminal) project deliverables, this paper describes the likely overall system environment, and the key technical challenges to be researched in TRUST for realising a reconfigurable terminal to meet the needs of users within that environment.

Unified Device-to-Device Communications for Low-Latency and High Reliable Vehicle-to-X Services

We propose a novel unified radio frame structure and medium access control (MAC) protocol for low-latency and highly reliable vehicle-to-X (V2X) communications. The radio frame structure enables short latency transmission and the unified device-to-device (D2D) communication for V2X services. The unified MAC protocol simultaneously enables the cellular-assisted and ad-hoc D2D communications to enable reliable V2X services in full/partial/out-of-cellular-coverage scenario. The initial system- level simulations show promising performance results in benchmarking scenarios: Unified D2D MAC can achieve radio transmission latency below 5 ms at high reliability of 90% packet reception ratio and with high availability of coverage radius of up to 200 meter. Our on-going work is expected to provide further evaluation results of the unified D2D MAC in heterogeneous V2X scenarios.

SYSTAS: Density-based algorithm for clusters discovery in wireless networks

The Internet of Things will comprise billions of randomly placed devices, forming a dense and unstructured network environment with overlapping wireless topologies. In such demanding environment, the grouping of IoT devices into clusters is a promising approach for the management and the control of network resources in the context of an autonomous system. This paper proposes the SYSTAS algorithm for the distributed discovery and formation of clusters in random geometric graphs of fixed wireless nodes by exploiting local topology knowledge and without having any information about the expected number of clusters. The density of the network graph, discovered by interacting with neighboring nodes and the topological features, as well as the model of preferential attachment are used by the proposed scheme. The effectiveness of SYSTAS is evaluated in various topologies. Experimental evaluation demonstrates that SYSTAS outperforms other clustering schemes; in some occasions these solutions have comparable results with SYSTAS but they require global network view, which leads to higher signaling cost.

Network Functions Supporting Reconfiguration in B3G Environments

It is envisaged that reconfigurable network architecture will support the reconfiguration of the different network entities (e.g. access points/base station) towards different radio technologies, thus providing additional integration benefits and potential leading to new radio access network topologies. The network function should support the reconfiguration of the network entities for efficient software download, end to end reconfiguration (ER) and QoS enhancement. In this contribution, a framework for a suitable reconfiguration management plane stretching from user interfaces/interactions, services, networks to terminals is proposed. Adaptation functions, located in the network, supporting reconfigurations will have an impact on end-user service provisioning and the cost of network operation and maintenance. The Reconfiguration Management Architecture introduced in this paper will facilitate inter-operator negotiations, involving exchange of information that is required for terminal reconfiguration and advanced radio resource management, and provide mechanisms for the dynamic planning and management of heterogeneous, coupled, and multi-standard radio access networks. Übersicht Es ist vorauszusehen, daß eine rekonfigurierbare Netzwerkarchitektur die Rekonfiguration der verschiedenen Netzinstanzen (z. B. Zugansgpunkte/Basisstationen) für verschiedene Funktechnologien unterstützen und auf diese Weise für zusätzliche Integrationsvorteile und ein Potential sorgen wird, das zu neuen Topologien bei den drahtlosen Zugangsnetzen führt. Die Netzwerkfunktionen sollten die Rekonfiguration der Netzinstanzen unterstützen, und zwar hinsichtlich eines effizienten Software Downloads, der Rekonfiguration von Ende-zuEnde-Verbindungen und der Verbesserung der Dienstgüte. In diesem Beitrag werden die Rahmenbedingungen für eine passende Rekonfigurationsleitebene geschildert, die sich von der Nutzerschnittstelle über Dienste und Netwerke bis zu den Endgeräten hin erstreckt. Anpassungsfunktionen, die sich im Netz befinden und die Vorgänge bei der Rekonfiguration unterstützen, werden sich auf die Bereitstellung von Endnutzerdiensten ebenso auswirken wie auf die Betriebsund Wartungskosten eines Netzwerks. Die Architektur zur Handhabung von Rekonfiguration, die in diesem Beitrag eingeführt wird, wird Verhandlungen zwischen Netzbetreibern ermöglichen, einschließlich des Austausches von Informationen, die erforderlich sind, um Endgeräte zu rekonfigurieren und Funkressourcen fortschrittlich zu verwalten. Des weiteren wird diese Architektur Mechanismen zur Verfügung stellen, welche die dynamische Planung und Handhabung heterogener, gekoppelter Zugangsnetze mit mehreren Mobilfunkstandards ermöglicht. Für die Dokumentation ER / SCOUT / SDR / RAN /PRM / SRM / CN / HRM / CSR / SDB / GRM / MBMS Frequenz 58(2004) 5-6

Fifth-Generation Technologies for the Connected Car: Capable Systems for Vehicle-to-Anything Communications

Two strong technology trends, one in the mobile communications industry and the other in the automotive industry, are becoming interwoven and will jointly provide new capabilities and functionality for upcoming intelligent transport systems (ITSs) and future driving. The automotive industry is on a path where vehicles are continuously becoming more aware of their environment due to the addition of various types of integrated sensors. At the same time, the amount of automation in vehicles increases, which, with some intermediate steps, will eventually culminate in fully automated driving without human intervention. Along this path, the amount of interactions rises, both in-between vehicles and between vehicles and other road users, and with an increasingly intelligent road infrastructure. As a consequence, the significance and reliance on capable communication systems for vehicleto-anything (V2X) communication is becoming a key asset that will enhance the performance of automated driving and increase further road traffic safety with combination of sensor-based technologies [1].

Research on timer settings for the soft handover algorithm with different system loads in WCDMA

The capacity of a CDMA system is mainly limited by mutual interference among mobile users, so system capacity and system performance depends highly on the system load, i.e., number of users per cell. On the other hand, one important measure for the signaling load in WCDMA is the number of handovers per time unit. In particular, the branch additions and releases for soft handover are crucial for the amount of signaling load in the network. The work to tradeoff between system capacity and signaling load in a cellular network needs to be considered. We investigate the soft handover algorithm known from the current 3rd Generation Partnership Project (3GPP) standardization with its timers to tradeoff the signaling rate against network performance which is defined by the satisfied user criteria as in ETSI SMG 2 UMTS 30.03. The effect of different loads given by the density of users is investigated and some instructive figures of timer settings according to the different load of the network are given in this paper. We have assumed speech service for our investigations.