2-460 Control Plane Sigtran HLR01 Sigtran User Plane Sigtran Sigtran MSS01 MSS02 BICC-CS-2 / SIP-T PSTN02 Sigtran Sigtran MGW01 MGW02 BSC01 BSSAP IP/ATM/TDM BSSAP Backbone BSC02 RANAP RANAP lu-CS lu-CS RNC01 RNC02 Figure 4.3 Example of signalling network architecture (SCP, service control point; CAP, Cammel application part; MAP, mobile application part; BICC, bearer independent call control; ISUP, ISDN user part; SIP, Session Initiation Protocol) Intra-VLR location updates Inter-VLR location update - incoming Inter-VLR location update - outgoing Number of attach subscribers Number of detach subscribers Authentication frequency EIR query frequency TMSI access Send authentication parameters and SAI responses Send ID and send parameters (IMSI inquiry) request IN calls per subscriber BH SMS MO during BH per VLR attached user SMS MT during BH per VLR attached user The signalling interfaces may be dimensioned for each SS7 protocol using the message flows as defined in the standards. Network Master Plan The output of the network dimensioning phase is a network master plan with details of all required network elements, subscriber capacity, traffic capacity and transmission requirements. The master plan also provides other important information regarding the network architecture and phases of network Detailed Network Planning deployment that serve as inputs for detailed network planning. The master plan should incorporate or contain information concerning network element deployment, architecture, internal traffic routing strategy, external traffic routing strategy, traffic intensity and transmission requirements for each interface. The master plan is an important input to the next phase of planning: detailed network planning. 4.2 Detailed Network Planning Detailed network planning is the phase where documents necessary to prepare source data for network element implementation are prepared. The implementation documents are based on the master plan prepared in the previous module and other inputs provided by the operator. 