Mobile and wireless networks have made remarkable
development in the last few years. At the present time many
mobile phones have also a WLAN adapter. One may expect
that near soon many mobile phones will have Wax adapter
too, besides their 3G, 2G, WLAN, Bluetooth etc. adapters. We
are using IP for both generations, 2.5G or 3G Public Land
Mobile Networks (PLMN) on one side and WLAN on the
other, raised study on their integration. Concerning the 4G, its
focus is towards flawless incorporation of cellular networks
such as GSM and 3G. Multi mode consumer terminals are
seen as must have for 4G, but special security mechanisms and
special operating system support in special wireless
technologies remain a test. Nevertheless, integration among
different wireless networks (e.g. PLMN and WLAN) is
implemented in practice even nowadays. Although, different
wireless networks from a sole terminal are used absolutely
Mobile and wireless networks have made remarkable
development in the last few years. At the present time many
mobile phones have also a WLAN adapter. One may expect
that near soon many mobile phones will have Wax adapter
too, besides their 3G, 2G, WLAN, Bluetooth etc. adapters. We
are using IP for both generations, 2.5G or 3G Public Land
Mobile Networks (PLMN) on one side and WLAN on the
other, raised study on their integration. Concerning the 4G, its
focus is towards flawless incorporation of cellular networks
such as GSM and 3G. Multi mode consumer terminals are
seen as must have for 4G, but special security mechanisms and
special operating system support in special wireless
technologies remain a test. Nevertheless, integration among
different wireless networks (e.g. PLMN and WLAN) is
implemented in practice even nowadays. Although, different
wireless networks from a sole terminal are used absolutely
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