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Li-Der Chou, Wei-Cheng Lai, Chen-Han Lin, Yen-Cheng Lin and Chin-Min Huang
Department of Computer Science and Information Engineering
National Central University
Chungli, 320 Taiwan
E-mail: cld@csie.ncu.edu.tw
+Information and Communications Research Laboratories
Industrial Technology Research Institute
Hsinchu, 310 Taiwan
E-mail: chenhlin@itri.org.tw
With the increasing demand of the mobility of mobile users, seamless handover is a
critical issue for heterogeneous network accesses. Improving the blocking probability of
SIP calls resulting from the handoff delay is a key issue for achieving seamless handovers
across WLAN and cellular networks. This paper presents an efficient scheme,
based on intelligent agents, to support pre-authentication for seamless handover, where
the intelligent agents are able to cooperate with each other adaptively. Besides, intelligent
agents offer the applicability of key distribution with EAP-SIM based AAA protocols
to enable fast authentication for inter-domain handovers. The paper proposes a number
of possible changes to these solutions for inter-domain operation. In addition, simulation
results show that the proposed intelligent-agent-based handoff scheme is capable of improving
the performance of the existing handover in call blocking ratio, packet loss ratio
and call interruption ratio, so as to reduce the signaling traffic in wireless networks.
Received September 15, 2006; accepted February 6, 2007.
Communicated by Ten H. Lai, Chung-Ta King and Jehn-Ruey Jiang.
*This work was supported in part by the Information and Communications Research Laboratory, Industrial
Technology Research Institute (ICL/ITRI), Taiwan, under project ID T1-94081-12.