A P2P Network of Space Containers for Efficient Management of Spatial-Temporal Data in Intelligent Transportation Scenarios

Abstract

The effectiveness of Intelligent Transportation Systems (ITS) depends on their ability to collect contextual data from various sources and appropriately generate and transport comprehensible, reliable and timely content to users. In such applications, the exchanged content is structured in space and time. Peer-to-peer (P2P) networks are the natural choice these applications due to their fault-tolerance, selforganization and scalability properties. However, a closer analysis of the available Distributed Hash Tables (DHT) protocols shows that the structure of the data gets lost and its short liveness leads to high signalling traffic.In this work we propose a novel overlay network of so called Space Containers for storing, accessing, manipulating and structuring dynamic geo-located content. The benefits of combining Space Containers and DHT are: clean application programming logic and efficient content retrieval while preserving the properties of DHTs.We describe the system architecture applied to a transportation scenario and show preliminary evaluation results.

Using tuple-spaces to manage the storage and dissemination of spatial–temporal content

“…Since DHT lookup operations are expensive, the more messages are requested at once from a container, the more efficient is the container based architecture. The reason for this is the fact that, once the container is found via DHT, its messages can be accessed directly via one TCP call, see [32] for more details.…”

Peer-based communication for a distributed, virtual Traffic Management Center

“…Its use in ITS has also been proposed for the exchange of geo-located data [12], for maintaing distributed heterogeneous databases [13], and in vehicleto-vehicle and vehicle-to-infrastructure communication [14]. Although there are many benefits to these types of architectures, there are also potentially serious drawbacks.…”

Towards Zero-Delay Recovery of Agents in Production Automation Systems

“…In [9] we have described how to replicate containers transparently to the using application. There, it has been presented how to combine containers with an overlay network based on the Distributed Hast Table (DHT) concepts [16] to make such containers fault-tolerant.…”

“…The goal of the presented work is to describe an abstraction framework, called MozartSpaces, that is used to store and distribute information needed by an agent to perform its objectives. Inherent components of MozartSpaces are containers [10] as shared data storages and aspects [9]. By separating computational logic and coordination information [8], the objectives of the agents are independently "stored" from the data needed to be capable of following its objectives.…”