Analyzing Area spectral efficiency and its impacts on the total spectrum requirements for IMTAdvanced

Terrestrial mobile systems generally employ a cellular architecture. Typical environments include macro, micro, and pico cells, further as a complementary hot spot. In order to establish high traffic capacity in IMT-2000 and its enhancement and systems beyond IMT-2000 with minimum handovers for mobile stations at various speeds and environments, in addition to maximizing spectral efficiency, it may be beneficial for the cells of IMT-2000 and its enhancement and systems beyond IMT-2000 to have different cell types related to mobile station parameters, such as mobility characteristics, output power, and types of services utilized. The area spectral efficiency is used in the spectrum requirement calculations to convert the capacity requirements in terms of bit/s/cell to the spectrum requirements in Hz. The area spectral efficiency factor should be measured below the IP layer and/or above L2. The spectral efficiency includes all RAT specific overheads, retransmission load, scheduling, etc. Even though for several teledensities the spectral efficiency might be the same, it is possible that the spectral efficiency will also vary between teledensities. This paper provides the results as spectrum required for the possible values of area spectrum efficiency in various time shifts.