• When the mobile requests access to the
network to make a call:
• BSS determines the nature of the call - e.g. regular
voice call, emergency call, supplementary service
• Allocates radio resources to the mobile for the call
• NSS determines the destination of the call:
•Mobile to mobile on same PLMN
•Mobile to mobile on another PLMN
•Mobile to fixed network (PSTN, ISDN)
• MSC / GMSC routes the call appropriately
and handles signalling
network to make a call:
• BSS determines the nature of the call - e.g. regular
voice call, emergency call, supplementary service
• Allocates radio resources to the mobile for the call
• NSS determines the destination of the call:
•Mobile to mobile on same PLMN
•Mobile to mobile on another PLMN
•Mobile to fixed network (PSTN, ISDN)
• MSC / GMSC routes the call appropriately
and handles signalling
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