Capacity enhancement of cellular mobile network using a dynamic electrical down-tilting antenna system

The use of a dynamic electrical down-tilting antenna (DEDA) is proposed as a technique to reduce co-channel interference and to increase system capacity. The improvement in performance is quantified by comparison between the proposed antenna system and the conventional antenna system in the current network. Simulations were made using one type of antenna: a Racal with 90° horizontal beam width and 6° vertical beam width in a specific area. Two simulation cases were considered. A reference case with a `fixed-tilt´ and a `variable-tilt´ case. The fixed-tilt case uses a fixed angle of tilt calculated in order to cover at least 90% of the users in the cells. The variable tilt case uses a minimum and a maximum angle of tilt. Simulations show that capacity improvement of about 20-25% with the proposed system can be achieved