T1-5 - Sedma Nacionalna Konferencija so Me|unarodno U~estvo...

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ARCHITECTURES FOR INTERWORKING BETWEEN PUBLIC LAND MOBILE NETWORKS AND WIRELESS LANS Toni Janevski 1 , Aleksandar Tudzarov 2 , Dusko Temkov 3 , Perivoje Stojanovski 4 1 University “Sv. Kiril i Metodij”, Faculty of Electrical Engineering, Karpos 2 bb, 1000 Skopje, tonij@etf.ukim.edu.mk 2 Mobimak AD, Orce Nikolov bb, Aleksandar.Tudzarov@mobimak.com.mk 3 Macedonian Telecommunications AD, Orce Nikolov bb, Dusko.Temkov@mt.com.mk 4 Faculty of Electrical Engineering, Karpos 2 bb, 1000 Skopje, pstojanovski@mt.net.mk Abstract – In this paper we analyze different architectures for PLMN-WLAN interworking. Main discussion is towards loosely-coupled and tightly-coupled interconnection scenarios. Furthermore, analysis is extended considering the authentication and security issues on the WLAN side. Virtual LANs are considered as an option for a hybrid security solution. Keywords : Architecture, Internetworking, Mobile, Wireless LAN. 1. INTRODUCTION Wireless access networks can be classified into two main groups: wireless networks that provide high data rates and have limited coverage from a given Access Point, such as 802.11 WLAN, and wireless networks that have wide coverage from a given base station and limited bandwidth, such as PLMN, PLMN, and UMTS (as well as CDMA2000 in Americas). Hence, the WLAN standard will never be able to provide large-scale coverage due to limited propagation. However, the WLAN systems are a good complement to the widespread PLMN systems as well as 3G systems. PLMN and 3G offer data rates that in relation to WLANs have low bandwidth. One may expect PLMN or 3G to be the dominating large-scale coverage data transfer wireless system for some years to come and due to this, the combination of WLAN and Public Land Mobile Network (PLMN) technology will use the best features of the both systems. High bandwidth WLANs are used for data transfer where available and PLMN is used where WLAN coverage is lacking. In other words, WLAN and PLMN should be able to complement each other and will probably not compete for the same users. The price for usage of WLAN should be smaller than price for usage of the same services (e.g. transferred data volume) over PLMN, thus forcing subscribers to use WLAN where it is available, and to use PLMN where WLAN is not available. Of course, such scenario is an excellent choice for mobile operators to additionally offer WLAN service, besides PLMN. Due to interest for WLAN considering lower price than classical cellular infrastructure, ease of use, and higher bandwidth than PLMN, either 2.5G or 3G (e.g. UMTS) mobile networks, large vendors on the telecommunication market have created different solutions for Wireless LAN operated by mobile operators [1-2]. Hence, in this paper we analyze different
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T1-5 - Sedma Nacionalna Konferencija so Me|unarodno U~estvo...

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