On-Demand Service Admission Control
VoD and IMS services introduce the need to enable deterministic QoS guarantees for latency, jitter and pack- et loss. To address this need, the Alcatel 5750 SSC optionally supports service admission control (SAC) for VoD and QoS-sensitive IMS applica- tions, thereby ensuring a reliable and consistent quality of experience for VoD services by preventing the over- booking of network resource capacity during periods of peak demand.
For non-IMS applications, the Alcatel-Lucent 5750 SSC offers a flexible API to make bandwidth reservations. IMS applications can use an ETSI TISPAN-compliant Rq interface to address the Alcatel- Lucent 5750 SSC in the capability
of the A-RACF. The SAC function is implemented as a logically central- ized policy-decision point, with full awareness of the first-, second- and third-mile network topology and resource states to ensure that suffi- cient resources are available at all critical bottlenecks in the end-to- end network.
Sophisticated bandwidth-allocation and arbitration policies can be enforced on links, per forwarding class, and on individual services that share a forwarding class. This ability optimizes service revenues that can be derived from installed network capacity while ensuring that overall service quality is maintained with a fair allocation of shared bandwidth among services.
12 Alcatel-Lucent 5750 Subscriber Services Controller
