 any other combination or distribution can be taken into account). The following GPRS input values should also be considered: number of PDP context per subscriber total existing PS traffic per subscriber per busy hour number and topology of BSCs additional BSS information, like number of RA, number of LA, etc. Traffic inputs can be given in a table, as in the example in Figure B.4. Traffic Distribution over Time (BH/Burstiness Considerations) The impact of the burstiness and load on busy hours has also to be considered. There are few possibilities to define the traffic behaviour over time, and the network planner needs to be aware of them to properly understand the input and provide the adequate output. For product dimensioning purposes it has been defined as: number of MO and/or MT MMS per user per month (it may include different access to different servers included in the concrete MMS service concept) number of busy hours per day, when the traffic distribution is provided so that the busy period of the day for MMS traffic extends to more than one hour peak traffic multiplier, when this peak correction factor is included to enable the peaks of traffic. Input Data Number of subscribers 1 500 000 1 600 000 1 700 000 1 800 000 2 000 000 Number of PDP context per user per BH Per subscriber's PS traffic in BH (kByte/h) MMS size (kByte) Number of MMS per user per month Peak hour multiplier Number of MMS per user per BH GPRS Penetration MMS penetration Figure B.4 MMS traffic inputs example MMS NETWORK PLANNING It is also important to consider, when possible and applicable, the current traffic distri- bution of SMS, with measurements taken from an existing network, if they are available. This is a valuable source to complement the forecast provided by the customer, although it should be considered case by case. Geographical Distribution Generally, a good understanding of the network topology is a requirement, particularly when defining locations of servers and distribution strategy. In order to better identify the sites