DocumentCode :
1704306
Title :
Delay-Throughput Tradeoff for Supportive Two-Tier Networks: A Static Primary Tier Vs. a Mobile Secondary Tier
Author :
Gao, Long ; Zhang, Rui ; Cui, Shuguang
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA
fYear :
2009
Firstpage :
1
Lastpage :
6
Abstract :
Consider a wireless network of two tiers with different priorities: a primary tier and a secondary tier, which is an emerging network scenario with the advancement of cognitive radio technologies. The primary tier is constructed over static nodes of density n, which are randomly distributed and have an absolute priority to access the spectrum. The secondary tier contains mobile nodes of density m = nß with ß ¿ 2, which can only access the spectrum opportunistically to limit the interference to the primary tier. By allowing the secondary tier to relay the packets for the primary tier, we show that the achievable per-node throughput scaling for the primary tier can be improved to ¿p(n) = ¿(1/log n). In the associated delay analysis, two mobility models are considered for the secondary nodes: an i.i.d. mobility model and a random walk model. We show that the primary tier can achieve delay scaling laws of ¿(1) and ¿(1/S) with the two mobility models, respectively, where S is the random walk step size. Furthermore, we show that the primary tier can achieve a delay-throughput tradeoff of Dp(n) = O (n¿p(n)) with ¿p(n) = O(1/log n) for the random walk model. The throughput and delay scaling laws for the secondary tier are also established, which are the same as those for a stand-alone mobile network.
Keywords :
cognitive radio; mobile communication; radio networks; associated delay analysis; cognitive radio; delay scaling laws; delay throughput tradeoff; delay-throughput tradeoff; mobile secondary tier; mobility model; network scenario; per-node throughput scaling; random walk model; random walk step size; static nodes; static primary tier; supportive two-tier networks; wireless network; Ad hoc networks; Cognitive radio; Computer networks; Delay; Interference; Large-scale systems; Mobile computing; Relays; Throughput; Wireless networks;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE
Conference_Location :
Honolulu, HI
ISSN :
1930-529X
Print_ISBN :
978-1-4244-4148-8
Type :
conf
DOI :
10.1109/GLOCOM.2009.5426252
Filename :
5426252
Link To Document :
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