Aastra RFP 32 User Guide DECT Site Survey Kit (EMEA) - Page 50

Measurement/Planning Traffic density Once the supply range has been located and covered, the locations for the base stations are known. The second phase now looks at other requirements: The traffic volume, determined by the number of handsets and the frequency and duration of connections in an area defined by the customer. In most cases such a area does not match the coverage range of a base station. For each area you now need to determine how many base stations are currently being used to supply them. It may be necessary to boost the coverage with additional base stations for insufficiently supplied areas (in accordance with the customer's requirements). To do so we need to refer back to the base station locations that were determined for the area coverage. For instance, it is a good idea to place additional base stations at the centre of an area with a higher traffic volume, even if those units end up between two already positioned base stations. To determine the traffic volume, we assume three typical ranges: "low", "medium", "high". "High" means that approx. 50% of all handsets are making calls simultaneously. It is also important to note that the volume of traffic can vary considerably in the course of a day. The question is always whether or not to cover a traffic volume that may be higher only briefly in a particular area. 48