name: OCS
full_form: Online Charging System
context: to RG1 is closed. 6. OCS sends successful answer. 7. OCS proxy generates a Request Units Response [Update], based on the Request Units Response [Update] received from HPLMN OCS in step6. 8. OCS proxy sends the response back to PGW. Figure 4.3.1.3.1.2.5: re-autorization request triggered from OCS for a particular RG 1. RG was previously allocated Volume quota. The OCS determines rating conditions are changed (e.g. change of userâs tariff Plan or subscription) for the RG and quota needs to be re-authorized. 2. OCS sends Re-Auth-Request for this RG 3. OCS proxy generates a Re-Auth-Request, based on the Re-Auth-Request received from HPLMN OCS in step2. 4. OCS proxy sends the request to PGW. 5. PGW answers by sending Re-Auth-Answer with Result-code =DIAMETER_LIMITED_SUCCESS (2002) 6. Traffic for the RG is put on hold 7. OCS proxy generates a Re-Auth-Answer, based on the Re-Auth-Answer received from VPLMN PGW in step5. 8. OCS proxy sends the response to OCS. 9. PGW reports the used units
description: The Online Charging System (OCS) is a network function responsible for managing charging and billing processes in real-time. It enables operators to provide flexible and dynamic pricing plans by interacting with other network functions, such as the Policy and Charging Rules Function (PCRF) and the Packet Data Network Gateway (PGW), to authorize and manage data sessions.
explanation: OCS is classified as a Network Function because it performs a specific function within a telecommunications network. Its role in managing online charging and billing processes, along with its interactions with other network functions like PCRF and PGW, clearly define it as a component of the network infrastructure.
section_title: 4.3.1.3.1.2Message flows
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