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IEICE Transactions on Communications 2008 E91-B(1):14-21; doi:10.1093/ietcom/e91-b.1.14
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Cognitive Radio and Spectrum Sharing Technology -- Papers -- Cognitive Network

Testbed System of Inter-Radio System Switching for Cognitive Radio

Seishi HANAOKA1, Masashi YANO1 and Tetsuhiko HIRATA1

1 The authors are with Hitachi, Ltd., Kokubunji-shi, 185-8601 Japan. E-mail: seishi.hanaoka.kw{at}hitachi.com


  Abstract

The cognitive radio system consists of multiple wireless access systems that cover overlapping areas and cognitive terminals that use one or more of the wireless accesses simultaneously. In this paper, we describe the architecture of the cognitive radio system and the inter-system handover protocols. In the architecture, each cognitive terminal, which can access multiple radio systems, operates with a single local IP address. The control sequence and packet format are designed to achieve fast handover among the radio systems. Based on the architecture, we have developed a testbed system. On this system, we demonstrate that data can be delivered continuously and radio systems can be switched correctly without any packet loss. In addition, we present the result of the evaluation of the end-to-end latency on the testbed system. These testbed results demonstrate the system architecture described in the paper can achieve a cognitive radio system.

Key Words: cognitive radio, cellular, WiMAX, wireless LAN, system switching, testbed system

Manuscript received April 27, 2007. Manuscript revised July 20, 2007.


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