Alexander Gladisch

Survey on Mobility and Multihoming in Future Internet

Mobility and multihoming represent key challenges for the development of the current and Future Internet, especially because of the rapid increase of user mobility and network heterogeneity. Both issues, mobility and multihoming, are closely related to each other and mainly issues of the used IP addressing scheme. This survey presents a general overview on approaches that enable mobility and multihoming in Future Internet; it focuses especially on approaches that suggest using new addressing schemes on layer 3, namely Locator/ID Separation and Core/Edge Separation, in order to tackle mobility and multihoming issues in an integrated manner. In our survey, we present a classification of the investigated approaches and summarize the main solution strategies. Furthermore, we evaluate the investigated approaches on basis of their capabilities and technical properties. On basis of the evaluation, where we emphasize the benefits and shortcomings of current solution strategies, we discuss future research issues related to mobility and multihoming.

Survey on location information services for Vehicular Communication Networks

AbstractVehicular Communication Networks (VCNs) are used to supply a communication platform for Intelligent Transportation Systems services also for value added services in different road systems. In comparison to other communication networks, VCNs come with major challenges: high mobility and velocity of vehicles that cause rapidly change topology of network and fast change of vehicle’s locations. Location information services (LISs) or location management systems (LMSs) are used to provide location information about vehicles such as current location, speed, direction and report this information to other vehicles or network entities that require this information. We present a survey for LISs in VCNs and introduce 11 approaches in literature. Moreover, we present a classification for LISs and compare mentioned approaches based on our classification. Finally we evaluate studied LISs by some performance properties to measure their overall efficiency.

OPAL-VCN: Open-Air-Lab for vehicular Communication Networks

Vehicular Communication Networks (VCNs) provide a promising communication platform for Intelligent Transportation System (ITS) services as well as for value added services in different road systems. Despite the high demand on test fields for VCN related technical solutions and services, there are currently very few test fields for the immense requirement on test and R&D activities. Moreover, the known VCN-related test fields such as simTD and VII-California mainly focus on Vehicle-to-X communication (V2X), while there is less consideration of the requirements of related roadside backbone networks. This paper presents the Open-Air-Lab for VCNs (OPAL-VCN) as novel test field, especially concentrating on roadside backbone networks specified for VCN requirements. The OPAL-VCN is based on a wireless multi-layer roadside backbone network that employs modular and scalable system architecture. In this paper, we furthermore deal with the design, development and installation of OPAL-VCN. After completion, OPAL-VCN will comprise a test field of a total length of at least 30 km on the German highways A19 / A20 near Rostock city (Mecklenburg-Western Pomerania). Consequently, OPAL-VCN will provide an effective platform for R&D activities as well as for education and industry and can be used as basis for investigating and developing VCN related technologies and services.

Mobility-aware Forwarding mechanism for QoS enhancement in Wireless Mesh Backbones

Wireless Mesh Backbones (WMBs) provide promising solutions for future networking strategies. Due to the mesh nature and thus the resource restrictions of such backbones the integration of mobility aware preloading mechanisms is essential for QoS provisioning, especially in environments with high mobility clients. This paper presents a novel concept, called Mobility-aware Forwarding in Advance (MAFIA), to enhance the QoS provided by WMBs. Accordingly, two mechanisms are developed: best effort and QoS-oriented MAFIA. Best effort MAFIA mechanism provides preloading mechanism regardless of QoS requirements. QoS-oriented MAFIA considers traffic prioritization in conjunction with flows and their requirements. Both MAFIA mechanisms are used in a WMB developed as a roadside backbone network for vehicular environments.

Node-oriented Internet Protocol: A novel concept for enhancement of mobility and multi-homing in Future Internet

Mobility and multi-homing are closely related and mainly issues of the used IP addressing scheme. Novel addressing schemes that separate node identification and location are promising concepts to tackle the named issues. However, current approaches that make use of the address separation concept offer, among others, insufficient capabilities to select one or multiple network interfaces for a certain communication process, e.g. to enable load balancing. Therefore, we propose a novel approach called Node-oriented Internet Protocol (NIP). NIP adapts the address separation concept, introduces a novel three-tuple addressing scheme that adds an interface ID and enables network nodes to select sets of network interfaces to be used for communication sessions. Our work includes basic concepts for mapping system, schemes for packet forwarding, mechanisms for mobility and multi-homing support and strategies to ensure backwards compatibility. Building on that, the NIP concept enhances multi-homing and mobility capabilites with new functionalities in comparison to known approaches, especially referred to interface selection and bandwidth aggregation.

A scalable mapping approach for locator-identifier-separation architectures with flat node ID space

Locator-Identifier-Separation (LIS) architectures introduce a novel addressing scheme by decoupling the node identification and locator functionalities into separate address parts in order to tackle mobility and multi-homing issues. As part of LIS concepts, a fast and global scalable mapping system is required to resolve the node ID into the corresponding locations. Current mapping systems are typically only applicable on hierarchical node ID spaces that violate the LIS principle, or they suffer from administrative and latency problems. In this paper, we propose a scalable multi-level mapping system that is applicable for flat node ID spaces. We apply hierarchical distributed hash tables (DHTs) and multiple cache levels to provide global scalability, a high grade of administrative autonomy and it reduces potential latency issues that can be caused by non-hierarchical DHTs. Within the scope of our work, we evaluate several hierarchical DHT technologies that can be used for that purpose and estimate the performance of our mapping approach.