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The last year Mobile Operators have successfully offered mobile broad band services based on "USB dongles" and competitive flat rate subscriptions. Both the numbers of users as well as the "usage" in terms of transferred number of Mbytes per user and month are increasing substantially. This will require very cost-efficient high capacity network solutions. Mobile communication systems with coverage almost "Everywhere" (e.g. GSM) are deployed for mobile telephony services. They are feasible solutions for voice or low rate data services, but not economically viable for high data rates and high capacity access. For cellular systems so called Hierarchical Cells Structures (HCS) are used to provide services in areas with varying demand.
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