Mobile Cloud Computing


We conduct research with renowned partners from industry, politics, and academia. Please visit the linked subpages for more information about our current projects.

SimRa: Safety in Bicycle Traffic

Comparable to other major cities worldwide, Berlin aims to reduce traffic emissions. Foremost mechanism for this is to increase the share of bicycle traffic. However, polls show that a lack of safety and fear of accidents keeps people from using their bikes more frequently. Furthermore, it also quite hard from a city planning perspective to get a good overview of location, time, frequency, and kind of hazards in bicycle traffic since official accident statistics only cover crashes but do not provide information on near crashes. 

In this project, we collect – with a strong focus on data protection and privacy – data on such near crashes to identify when and where bicyclists are especially at risk. We also aim to identify the main routes of bicycle traffic in Berlin. To obtain such data, we have developed a smartphone app that uses GPS information to track routes of bicyclists and the built-in acceleration sensors to pre-categorize near crashes. After their trip, users are asked to annotate and upload the collected data, pseudonymized per trip. 

The collected data offers detailed insights into bicycle traffic in Berlin and hazardous situations to public administrators and other interested entities so that the number of near crashes (and hence also crashes) can be reduced. The data can also be used to optimize traffic flows to make bicycle traffic more attractive. For the evaluation of data, we plan to cooperate with interdisciplinary partners such as city planning, interested citizens, but also the Berlin Senate Department for the Environment, Transport and Climate Protection.

The project is funded within the scope of TU Berlin’s citizen science initiative. Additional cooperation partners are welcome. Also other cities beyond Berlin can participate. For this, we need a point of contact (a person or a group) in the respective city who will (i) recruit local cyclists to participate and (ii) make use of the collected and preanalyzed data, e.g., to identify the root causes on site and to work with public administration to resolve the situation.

At the moment, the app is available for Android (6.0+) and IOS.

Up-to-Date Statistics & Results

Further information can be found on

SimRa is award winner of the German Bicycle Award 2022 in the category Service & Communication:

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FogStore – A Data Management Platform for Geo-Distributed Fog Environments

Today’s applications are typically cloud-based. However, the emerging Fog Computing paradigm, i.e., using cloud and edge resources but also small- to medium-sized data centers in the network between edge and cloud at the same time, promises additional benefits in terms of quality of service (QoS) for some applications. Especially, emerging application domains such as the Internet of Things (IoT), autonomous and interconnected driving, future mobile networks (5G), or eHealth can benefit from or even heavily depend on these QoS improvements. The increasing degree of geo-distribution, however, requires rethinking system and application architectures. Data management systems in particular – both of the relational and NoSQL kind – are ill prepared for this degree of geo-distribution and other characteristics of fog environments. In essence, this means that fog developers currently have to implement data management tasks at application level.

With FogStore, we aim to close that gap. Namely, the core results of the project will include:

  1. A data management system that supports arbitrary, dynamically changeable data distribution policies as defined by applications while dealing with aspects such as QoS constraints or failures.
  2. An application-side middleware component that uses lightweight monitoring for replica selection in case of moving application clients.
  3. A manager for predictive replica placement that actively moves data between edge locations, anticipating future application requests. For this, the middleware will analyze past application access patterns and application-provided hints through time series analysis methods as well as machine learning to predict future application access positions. Thus, a replica can be provisioned close to that position before the data is accessed.
  4. A novel benchmarking framework designed for geo-distributed and coordinated execution of several parallel workloads. Such a framework can – and will in the proposed project – be used to evaluate performance and other QoS properties of fog data management systems but also more generally of data management systems for geo-distributed environments, e.g., as in cloud federation.

The project is funded by the DFG for three years, it started on September 1, 2019.

Fog4IoT: Fog Data Management for IoT Applications

Typically, IoT applications rely on data produced by sensors to trigger actions on smart devices. As an example, wind, temperature, and brightness sensors in a smart home could be used to control window blinds or a smart factory might use vibration and noise sensors to shut off CNC machines before permanent damage occurs as well as to enable preventive maintenance. 

In both scenarios, data is processed and decisions are taken either locally on edge devices or in cloud-based services. Often, there are also secondary uses or improved decision processes when collecting and correlating sensor data from various sources in the cloud. For IoT applications, both cloud and edge computing have their own advantages and disadvantages: while edge computing primarily suffers from capacity constraints on local devices, cloud services have much higher latencies and a higher probability of not being available locally due to network outages. Furthermore, privacy concerns may further limit choices depending on the kind of data. For instance, personal data in EU smart home scenarios can be subject to the GDPR and manufacturers may be reluctant to expose data on sensitive production processes to outsiders. All these aspects need to be weighed carefully so as to alleviate weaknesses and fully utilize strengths when building data management systems for IoT applications in fog environments, i.e., using cloud and edge computing as well as possible intermediary nodes within the core network at the same time.

In this project, we research novel data management and data distribution techniques specifically tailored to the needs of IoT applications. Such techniques need to efficiently distribute and move data across edge and cloud nodes while hiding as much complexity as possible from applications. A particular challenge in this project is that IoT applications can use both streaming and event-driven functions (‘serverless’) as computation approaches depending on the respective use case. Additionally, there are scenarios where pub/sub-based data distribution provides much more flexibility than standard point-to-point communication. The goal of this project is to combine these different approaches and techniques into an integrated platform that offers a continuum choice between functions and streams.

The first four years of this project are funded by the Einstein Foundation; the project started in January 2018.