Multi carriers dedicated for HSDPA and R99

The advantage of this carrier strategy is the performance improvement of both HSDPA and R99 calls. Since the separated carriers are prepared for each technology, the possible interference between R99 and HSDPA would be minimized. In this configuration, the code allocation problem shown in single carrier strategy can be also avoided. The disadvantage of this configuration is an impact on the investment and running cost since this configuration will require high power amplifier for multi carrier operation and other necessary resources such as Iub and base-band resources which is necessary to be prepared for each cell (e.g. common channels). In some case, the licensing scheme contracted between operator and vendor may be also related. If cell license is applied in the contracted license scheme, the increase of the number of cells will affect on the amount of license fee to be paid.Another concern of this cell configuration strategy is the mobility of HSDPA call. The following figure illustrates the case that the area where single carrier strategy is applied is adjacent to the area where multi carrier is applied. Fig. below HSDPA mobility problem In this case, when HSDPA user is going to move from single carrier area to multi carrier area, HSDPA user prefers to be handed over to the HSDPA cell for HSDPA service continuity.

In this case, when HSDPA user is going to move from single carrier area to multi carrier area, HSDPA user prefers to be handed over to the HSDPA cell for HSDPA service continuity.

However it depends on the supported functionality of the equipment vendor and also depends on the specification of the terminal, even if vendor would like to choose this mobility scenario. In addition, there would be the interruption time during inter frequency handover process in this scenario and such interruption time may worse the end-user experience. Thus the parameters tuning shall be done to minimize the interruption time as much as possible.