Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

FP5

SMART-ITS Résumé de rapport

Project ID: IST-2000-25428
Financé au titre de: FP5-IST
Pays: Germany

Ultra-lightweight and low-power communication stack for ad-hoc networks

Smart-Its P are using a lightweight, ultra-low power communication stack that is designed for fitting exactly the needs of a such environments as
- Decentralised and cellular architecture and media access;

- Ad-hoc behaviour and spontaneous book-in into a network;

- Real time communication and synchronization;

- Predictable processor load due to the network stack;

- Low power consumption and small package of hardware;

- Easy (no) administration and maintenance;

- Support for spontaneous collaboration between peers.

Data transmission is based on a stateless peer-to-peer protocol named AwareCon. It implements physical access to the transceiver including the coding on the medium and the data link layer (DLL). On the physical layer, a time division multiplex collision avoidance protocol is used, based on fixed slots and strict synchronization of all Smart-Its within communication range. Thereby a wake-up on traffic procedure is avoided, as it is problematic on a network channel. The access to network is regulated cooperatively by a very short arbitration. The network is very scalable as the arbitration allows several hundreds of nodes to co-exist within one network cell with only slightly degrading of overall throughput. The AwareCon introduces the novel concept of context awareness to networks and is therefore able to react better on changes in the setting and environment. Reduction of power consumption and better network performance are results of this novel method.

The higher layer of the stack - named ConCom - allow for a efficient and common communication between Smart-Its devices but also between Smart-Its devices and Internet enabled devices. ConCom expresses and communicates information, especially context, in a way that is similar to a natural spoken language. ConCom works connectionless and without addressing and forms an efficient way to transport information between mobile devices with limited resources. It is especially applicative for highly mobile, dynamic and heterogeneous settings. The layer defines service expressions to express and access services between Smart-Its devices in peer-to-peer settings but is also used for providing development services. The main strength of this layer is the ability to provide an ad-hoc, location and context aware communication platform for spontaneous collaboration between Smart-Its devices. The ability for spontaneous collaboration in turn can be seen as the enabler for emerging functionality in creation of application setting build through the project. Here newer application build on top of available capabilities of existing devices made available to Smart-its peers through the ConCom communication language.

Reported by

University of Karlsruhe
Kaiserstrasse 12
76131 Karlsruhe
Germany
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