The full exploitation of multi-hop multi-path connectivity opportunities offered
by heterogeneous wireless interfaces could enable innovative Always Best Served
(ABS) deployment scenarios where mobile clients dynamically self-organize to
offer/exploit Internet connectivity at best. Only novel middleware solutions based
on heterogeneous context information can seamlessly enable this scenario:
middleware solutions should i) provide a translucent access to low-level
components, to achieve both fully aware and simplified pre-configured
interactions, ii) permit to fully exploit communication interface capabilities, i.e.,
not only getting but also providing connectivity in a peer-to-peer fashion, thus
relieving final users and application developers from the burden of directly
managing wireless interface heterogeneity, and iii) consider user mobility as
crucial context information evaluating at provision time the suitability of available
Internet points of access differently when the mobile client is still or in motion.
The novelty of this research work resides in three primary points. First of all, it
proposes a novel model and taxonomy providing a common vocabulary to easily
describe and position solutions in the area of context-aware autonomic
management of preferred network opportunities.
Secondly, it presents PoSIM, a context-aware middleware for the synergic
exploitation and control of heterogeneous positioning systems that facilitates the
development and portability of location-based services. PoSIM is translucent, i.e.,
it can provide application developers with differentiated visibility of data
characteristics and control possibilities of available positioning solutions, thus
dynamically adapting to application-specific deployment requirements and
enabling cross-layer management decisions.
Finally, it provides the MMHC solution for the self-organization of multi-hop
multi-path heterogeneous connectivity. MMHC considers a limited set of practical
indicators on node mobility and wireless network characteristics for a coarsegrained
estimation of expected reliability/quality of multi-hop paths available at
runtime. In particular, MMHC manages the durability/throughput-aware formation
and selection of different multi-hop paths simultaneously. Furthermore, MMHC
provides a novel solution based on adaptive buffers, proactively managed based on
handover prediction, to support continuous services, especially by pre-fetching
multimedia contents to avoid streaming interruptions.
| Identifer | oai:union.ndltd.org:unibo.it/oai:amsdottorato.cib.unibo.it:925 |
| Date | 07 April 2008 |
| Creators | Giannelli, Carlo <1979> |
| Contributors | Boari, Maurelio |
| Publisher | Alma Mater Studiorum - Università di Bologna |
| Source Sets | Università di Bologna |
| Language | English |
| Detected Language | English |
| Type | Doctoral Thesis, PeerReviewed |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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