Veröffentlichungen und Vorträge

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Beschreibung: The application of space-time/frequency coding is an
interesting means to mitigate fading effects in terrestrial
channels. Therefore, the well-known Alamouti scheme was
introduced to the DVB-T2 standard. However, there have not
been any measurements so far analysing the achievable gains
using MIMO-schemes for broadcasting in UHF channels. Thus,
extensive measurements have been performed. The obtained data
was then used to feed a simulation chain for simulating the
potential benefits of Alamouti coding in the measured channel.
The created simulation results show significant gain for the
application of Alamouti in DVB-T2.

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Beschreibung: The SOCRATES (Self-Optimisation and self-ConfiguRATion in wirelEss networkS) project is developing self-organisation methods for LTE radio networks. Self-organisation is expected to substantially reduce the necessary human intervention in network operations with the effect of a significant reduction in operational expenditure (OPEX) and an improvement in service quality. Selforganisation comprises self-configuration, self-optimisation, and self-healing. This document contains updates to the previous SOCRATES WP2 deliverables D2.1, D2.2, D2.3, D2.4 and D2.5. In the SOCRATES deliverable D2.1 [1] twenty-four use cases for self-organisation are described. In D2.2 [2] the technical and business requirements put on solutions for self-organisation are analysed in detail, and in D2.3 [3] criteria, methodologies and scenarios to assess the solutions for selforganisation are described. In deliverable D2.4 [4] the framework for the development of self-organising algorithms was defined. In deliverable D2.5 [5], various elements that contribute to the framework were either added or updated, providing an extension to the work in the previous WP2 deliverables D2.1, D2.2, D2.3 and D2.4. This document reflects new insights from the progress in the overall project since the issue of D2.5, and further defines the framework. There are three sections in this document. First, there is an updated section on reference scenarios. This section defines the details of the basic macro scenario, and this scenario can be used to realistically model a macro-cell network. There is also a new section on architectural issues. In contrast to the high-level architecture sections in previous WP2 deliverables, this section considers the architecture for individual use cases. Finally, there is a new section on integration of use cases, which considers aspects such as objectives, approach, scenarios, assessment methods and architecture. Specifically, it considers the architectural components required to integrate SON functionality, and the simulation approach for modelling integrated SON functions. This document complements previous WP2 deliverables (D2.1 to D2.5), and to gain a complete picture it should be read in combination with those deliverables. The work on development of solutions for self-optimisation (in WP3), and self-configuration and selfhealing (in WP4) has enabled a better definition of the use cases and framework in WP2. In return, the updates in this document serve as a reference for further work in WP3 and WP4. With this deliverable, the WP2 work in SOCRATES is completed. The work  package has successfully fulfilled its role of defining the use cases and framework for SOCRATES, and the WP2 results have served as an effective basis for the work in WP3 and WP4.

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Beschreibung: The goal is the development of an integrated network simulation which considers realistic channel modeling on the one hand and appropriate mobility models on the other hand.

Beschreibung: The number of traffic accidents with injury to persons is still too high. Hence, it is an important question, how the number of accidents with pedestrians can be reduced. The approach of this paper is to integrate existing technologies and mobile devices into a cooperative system which is able to detect critical situations and execute preventive counteractive measures such as warn traffic participants. The paper starts with an analysis of the different types of accidents in a detailed accident study using the GIDAS database and reports of local accidents with pedestrians. With regard to the different types of accidents it is important to consider who was at failt in which situation. The obtained knowledge is used to build general scenarios to determine on effective means to prevent such accidents. Finally, three different system architectures with varying level of capabilities and complexity are designed.

Beschreibung: Planning tools provide highly advanced functionalities to support processing of planning tasks for different radio services (GSM, UMTS, WiMAX, etc.). Based on a variety of input data sets, preselections and former planning results, the tools compute parameter sets for implementation into the operational network. Typically, the implemented results require adjustments, optimisation or even replanning depending on the effects that have been measured in the network. Reliable information about a current network status in terms of numbers of signalling and data traffic, successful and failed assignments (e. g. channel or HO), etc. is given via statistics of vendor-specific performance counters. These statistics are collected in the Operation and Maintenance Centre (OMC) in conjunction with information about the hierarchical connections of the network elements. The hierarchical information is similar to the entries of the site data sets of common planning tools. However, the data base in the OMC is strictly separated from the data bases of planning tools. Therefore, the flow of information from operation to planning is ineffective. Introducing an automatical feed of statistical data from the operational network into planning would shorten time periods of planning iterations and offer reliable traffic information as input data for planning algorithms. Furthermore, reliability of data is a requirement for automation of particular planning tasks. These circumstances are summarised in a framework presented in this paper. The combination of the data bases of OMC and planning tool is one major task of this framework. Basic principles are applied to merge the hierarchical content of the two data bases taking into account the vendor dependency of the performance counters. The gathered experience is based on analysis of planning and performance data of a real network. This data is classified. For this reason, no results are published.