Real-Time Communications in Large-Scale Wireless Networks

Autor: Liang Song, Dimitrios Hatzinakos
Jazyk: angličtina
Rok vydání: 2008
Předmět:
Zdroj: International Journal of Digital Multimedia Broadcasting, Vol 2008 (2008)
Druh dokumentu: article
ISSN: 1687-7578
1687-7586
DOI: 10.1155/2008/586067
Popis: There is an emerging need for realizing real-time quality of service (QoS) over multihop wireless communications in large-scale wireless networks. The applications can include wireless mesh infrastructure for broadband Internet access supporting multimedia services, visual sensor networks for surveillance, and disaster-relief networks. However, a number of challenges still exist as revealed by recent works, where the dataflow QoS performance such as throughput and end-to-end delay can degrade fast with the number of wireless hops. We propose to use large-scale cognitive networking methods to resolve the wireless multihop challenges. By the cognitive-networking concept, data packets travel along opportunistically available paths in the network with opportunistically available spectrum in every hop. Reliable end-to-end communications can be achieved for real-time services, where we show that (1) dataflow throughput can be independent of any number of wireless hops, (2) end-to-end delay and delay variance increase linearly with the number of wireless hops, and (3) delay variance decreases to zero with higher network density. These results are supported by analysis, simulations, and experiments.
Databáze: Directory of Open Access Journals
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