9. WCDMA Billing System

In a telecomm operating network, as subscribers are offered service, service billing is accompanied. Essentially, as a measure of the network resources used by subscribers, billing is classified into Circuit Switched (CS) domain billing and Packet Service (PS) domain billing. CS domain adopts circuit switching, so call duration becomes the primary factor of billing. PS domain data works in packet transmission, so traffic is the primary factor of billing, but time is not excluded. This chapter mainly introduces the billing principles of CS domain and PS domain, including the billing architecture of core network, bill generation mechanism and processing course. 

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