Jens Bartelt

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Cloud computing draws significant attention in the information technology (IT) community as it provides ubiquitous on-demand access to a shared pool of configurable computing resources with minimum management effort. It gains also more impact on the communication technology (CT) community and is currently discussed as an enabler for flexible, cost-efficient(More)
Very dense deployments of small cells are one of the key enablers to tackle the ever-growing demand on mobile bandwidth. In such deployments, centralization of RAN functions on cloud resources is envisioned to overcome severe inter-cell interference and to keep costs acceptable. However, RAN back-haul constraints need to be considered when designing the(More)
Cloud radio access networks promise considerable benefits compared to decentralized network architectures, but they also put challenging requirements on the fronthaul and backhaul network. Flexible centralization can relax these requirements by adaptively assigning different parts of the processing chain to either the centralized baseband processors or the(More)
To meet the increasing capacity demands of future mobile networks, dense deployment of radio access nodes in combination with partly centralized processing by means of a cloud-based architecture is a promising option. In such an architecture, the design and optimization of the backhaul plays a crucial role. In this paper, we review different backhaul(More)
One major topic of research into self-organizing network technology is the coordination of SON use cases. Network operators expect a coordinated handling of the parameter and configuration changes submitted to the operating network by closed-loop SON use case implementations. There are currently two basic approaches for SON use case coordination discussed(More)
We propose an optical-wireless 5G infrastructure offering converged fronthauling/backhauling functions to support both operational and end-user cloud services. A layered architectural structure required to efficiently support these services is shown. The data plane performance of the proposed infrastructure is evaluated in terms of energy consumption and(More)
This paper provides an overview of joint radio access network (RAN) and backhaul (BH) optimization methods in dense small cell networks, assuming a heterogeneous backhaul and centralization by Cloud RAN. The main focus is on the design of novel MAC (medium access control) and RRM (radio resource management) schemes for constrained, non-ideal backhaul which(More)
A mobile network employing a so-called cloud-based architecture requires an additional fronthaul network to forward digitized samples. With increasingly dense deployments of small cells, the availability of high quality fiber fronthaul cannot be expected at all sites. Longer fronthaul distances or the employment of wireless technologies renders fronthaul(More)
Cloud-based radio access networks, which utilize a centralized baseband unit, require additional fronthaul links as compared to conventional networks. While fiber is commonly used for these fronthaul links, millimeter wave technology offers a cost-effective alternative on the “last mile” of the network. However, millimeter wave technology has(More)
The use of soft information instead of hard bits has been widely adapted in signal processing for digital communication to improve the reliability of data transmission by techniques like turbo equalization, turbo decoding, or LDPC codes. For future mobile networks employing a centralized architecture in which the antenna and the baseband processing are(More)