dover to the best adjacent cell. A decision is made according to the value of signal level variations between the two defined samples. A traffic reason handover commanded either by the MSC or BSC allows outgoing handovers from high traffic cells towards less-loaded cells. The idea behind this feature is to reduce the power budget handover margin logically in the cell's edge. Therefore, mobiles in the border of high load cells are automatically handed-out to neighbours, enabling loads to be shared over the whole area. To be valid candidates, target cells should not be loaded. This criterion is also verified in the algorithm. Handover due to an exceeded distance between the BTS and MS allows the repartition of traffic on all cells to be controlled, especially in rural area where wide-range cells are used. Also, a directed re-try feature explained before allows additional loads on already loaded cells to be controlled and reduced. Parameters As described above, handover and adjacency notions are to be separated in one's mind. Each aspect indeed involves a different set of parameters. This subsection explains the philosophy behind choosing parameters for both handover and adjacency mechanisms. Handover Parameters This type of parameter, also called handover control (HOC) parameters, is tuned on a cell basis. It means that cell by cell a different value can be set for a given parameter. Those parameters have the specificity to be cell dependent (e.g. a parameter that sets the level threshold in the downlink in order to perform an outgoing handover with a level cause). According to the handover algorithm, each parameter and its usability can be described explicitly. Enablability Most of the handover types described above are triggered only if they are enabled by setting the 'enable HO' parameter to 'yes'. Otherwise they do not occur. Periodicity Some parameters drive in terms of SACCH intervals the time difference between two successive similar handover events, such as handover attempts, handover failures, power budget