Seamless Handoff Scheme Based on Pre-registration and Pre-authentication for UMTS–WLAN Interworking |
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Authors: | Hyun-Ho Choi Osok Song Dong-Ho Cho |
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Affiliation: | (1) Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology (KAIST), Taejon, Republic of Korea;(2) Global Standards & Research Team, Telecommunication R&D Center, Samsung Electronics, Co., Ltd, Suwon-Si Gyeonggi-Do, Korea |
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Abstract: | Interworking issues between Universal Mobile Telecommunication System (UMTS) and Wireless Local Area Network (WLAN) have become
a great matter of interest as an increasing number of mobile internet users require broadband wireless access to IP services
in the wide area. In this paper, we present a practical UMTS–WLAN interworking architecture based on 3GPP standards and propose
a seamless handoff scheme that guarantees low delay and low packet loss during UMTS–WLAN handoff. For low handoff delay, the
proposed handoff scheme performs pre-registration and pre-authentication processes before layer 2 handoff. Moreover, it uses
packet buffering and forwarding functions in order to reduce packet loss during the handoff period. On the above basis, detailed
signaling procedures are presented, together with system requirements when a mobile terminal moves from UMTS to WLAN and vice-versa.
Numerical results show that the proposed scheme performs well with respect to signaling cost, handoff delay, and packet loss
compared with conventional schemes. |
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Keywords: | seamless handoff UMTS WLAN interworking pre-registration pre-authentication |
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