We address the problem of efficient data gathering in a wireless network through multihop communication. We focus on two objectives related to flow times, that is, the times spent by data packets in the system: minimization of the maximum flow time and minimization of the average flow time of the packets. For both problems we prove that, unless P = NP, no polynomial-time algorithm can approximate the optimal solution within a factor less than Omega(m(1-epsilon)) for any 0 < epsilon < 1, where m is the number of packets. We then assess the performance of two natural algorithms by proving that their cost remains within the optimal cost of the respective problem if we allow the algorithms to transmit data at a speed 5 times higher than that of the optimal solutions to which we compare them.
Minimizing Flow Time in the Wireless Gathering Problem / Vincenzo, Bonifaci; MARCHETTI SPACCAMELA, Alberto; Peter, Korteweg; Leen, Stougie. - In: ACM TRANSACTIONS ON ALGORITHMS. - ISSN 1549-6325. - STAMPA. - 7:3(2011), pp. 1-20. [10.1145/1978782.1978788]
Minimizing Flow Time in the Wireless Gathering Problem
MARCHETTI SPACCAMELA, Alberto;
2011
Abstract
We address the problem of efficient data gathering in a wireless network through multihop communication. We focus on two objectives related to flow times, that is, the times spent by data packets in the system: minimization of the maximum flow time and minimization of the average flow time of the packets. For both problems we prove that, unless P = NP, no polynomial-time algorithm can approximate the optimal solution within a factor less than Omega(m(1-epsilon)) for any 0 < epsilon < 1, where m is the number of packets. We then assess the performance of two natural algorithms by proving that their cost remains within the optimal cost of the respective problem if we allow the algorithms to transmit data at a speed 5 times higher than that of the optimal solutions to which we compare them.File | Dimensione | Formato | |
---|---|---|---|
VE_2011_11573-91177.pdf
solo gestori archivio
Tipologia:
Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
254.15 kB
Formato
Adobe PDF
|
254.15 kB | Adobe PDF | Contatta l'autore |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.