The Research And Implementation On Disaster Tolerant Of Mobile Intelligent Service Control Point

With the widespread popularity of mobile intelligent services, the security and stability issues of SCP (Service Control Point) are increasingly outstanding. The simple protection provided by local dual hosts or cluster can no longer meet the strict requirements of system's high availability. To guarantee the continuity and reliability of services, it is in urgent need of the comprehensive protection of disaster tolerant.This paper firstly expounds the main factors needed to be considered for disaster tolerant of SCP, summarizes the existing disaster tolerant systems and key technologies, and analyzes their advantages and disadvantages.Secondly, the mechanism of service interrupt and billing loss, which is caused by the inability of"hot"takeover for disaster recovery, is analyzed. Then, two billing protection approaches for CAMEL (Customized Application for Mobile Network Enhanced Logic) Call service and CAMEL GPRS (General Packet Radio Service) service are suggested, which are respectively based on recording the ACR (Apply Charging Report) and screening the CDR (Call Detail Record), and based on delivering the charging report backward. These two approaches avoid huge overhead on matching the CDR by the identification of the call reference number or the free-format data. It becomes available to calculate the exact fee uncharged by collecting the ACR of lost dialogue and integrating the charging information with the CDR of mobile switch center, which successfully avoids charging the subscriber twice.Finally, this paper uses functional separation and centralized management of service access and service control, and proposes a disaster tolerant solution of SCP system based on M+N architecture. It has good scalability, high availability, fine maintainability, and small impact on business equipment. The system test and practical application show that the rapid application recovery ensures business continuity; the tolerance of multiple points'failure improves the availability of system ; the distribution of data replication enhances the handling capacity of SCP on the single equipment; the billing protection of zero-error level for CAMEL Call service and CAMEL GPRS service guarantees the business continuity, avoids the billing loss, and defends the interests of both the operator and the subscriber.