connections are not limited by any additional parameterisation. On the other hand, a stationary end user near a base station in a network where the soft handovers are disabled will not generate any AAL2 signalling traffic. To summarise the paragraphs above, making a statement about how much transport signalling capacity is required for a WCDMA base station is very hard. A safe value can range practically from 20 kbps (single carrier rural base station) to 200 kbps (urban high capacity base station) and even up to 400 kbps (multi carrier urban base station) per base station according to simulations depending on the above conditions. For Iur and I-cs interfaces the loading is not likely to go SO high since one major load contributor, the mobility of people, has only a small effect. Also, soft handovers have a small effect and bandwidth reallocations are likely to be very rare. It all this information is put together transport signalling capacities of 100 kbps for each 2 Mbps in Iur and 50 kbps for each 2 Mbps in should be reasonable. WCDMA System Signalling Signalling for the WCDMA system means signalling that is needed by the WCDMA network for commu- nication between nodes (i.e. base stations, RNCs, SGSN and MSC). In the Lub interface this signalling uses the Node B application part (NBAP) Signalling Protocol, in the Iur interface between RNC signalling it Interface Planning uses Radio Network System Application Part (RNSAP) Signalling Protocol and in I interface signalling it uses the Radio Access Network Application Part (RANAP) Signalling Protocol. NBAP signalling is used for procedures of logical operation and maintenance of WCDMA base stations. This includes signalling related to cell configuration, controlling of random access, forward access and paging channels, initialising measurements in the cell or base station and reporting the results and finally managing faults. The major difference in dimensioning the NBAP signalling channel is made by reporting the frequency of cell and/or base station measurements