In order to start HSDPA service in the network, one of the biggest issues for operators is which kind of cell configuration scenario shall be selected since the number of cells deployed in network will affect the number of Node-B hardware and have a direct impact on the investment and its running cost.
From operator’s viewpoint, the network resource efficiency must be maximized as much as possible, on the other hand from end-user viewpoints, much higher end-user throughput is needed but in such case the network efficiency will be worse if the generated traffic as a network is quite low. Therefore the trade-off relations between network efficiency and end-user experience can not be avoided and operator must choose their cell deployment strategy depending on the environment to deploy HSDPA and traffic demand there with considering the balance of end-user experience and network efficiency.
The following figure shows the possible cell configuration of HSDPA when operator starts to deploy HSDPA. At initial stage, operator has to choose the one from the two scenarios, that is, whether HSDPA shall share the single carrier with R99 (Single Carrier Strategy)or HSDPA shall use the dedicated carrier separated from R99 carrier (Multi Carrier Strategy).
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