Analytical Study on Performance Improvement of Service Availability in Heterogeneous Radio Networks

Kanshiro KASHIKI  Tadayuki FUKUHARA  Akira YAMAGUCHI  Toshinori SUZUKI  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.12   pp.3302-3310
Publication Date: 2010/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.3302
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Wireless Distributed Networks)
cognitive radio,  heterogeneous radio network,  efficient use of radio spectrum,  service availability,  analytical study,  throughput,  time delay,  experimental model,  theoretical limit,  

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From the viewpoint of service availability, which is an important evaluation factor in communication quality, we analytically study the performance improvement of heterogeneous radio networks that cooperatively select one system from among multiple communication systems. It is supposed herein that the heterogeneous network selects one system with the larger throughput or with the smaller time delay. To this end, we firstly derive analytical methods using the probability density function of the performance characteristics of the communication systems consisting of the heterogeneous radio network. The analytical method described here is comparatively general and enables the handling of cases where complete cooperation can and cannot be achieved in the heterogeneous network. As for the performance characteristics, we conduct an experiment using the wireless LAN to establish the probability distribution models of the throughput and time delay in the communication system. Using the analytical method and the experimental model obtained, we calculate the performance improvement by cooperative operation in the heterogeneous network. The equational expression to obtain the theoretical performance improvement limit is also investigated through the analytical equations.