Abstract
VoLTE (Voice over LTE) based on the IP Multimedia Subsystem (IMS) architecture provides real-time and multimedia communications services in 4G. To provide telecom-grade services, the reliability is one of the most important challenges. Telecommunications systems typically require 99.999 % reliability, which means that system only tolerant of downtime less than 5 min per year. To achieve such high reliability, multiple servers and a shared database are deployed for the IMS services. This paper investigates the performance of different database (DB) access mechanisms such as Write-Through (WT), Write-Back (WB), and the database-only (DB-only) mechanisms. Then this paper proposes a loss-recovery enhancement for the WB mechanism to improve the successful call setup probability. The analytic models are derived to analyze the performance of the proposed mechanism.
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Acknowledgments
The work of Whai-En Chen was sponsored in part by MOST 104-2221-E-197-012, 104-3115-E-009-004 projects and III project.
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Chen, WE., Tseng, LY. & Chu, CL. An Effective Failure Recovery Mechanism for SIP/IMS Services. Mobile Netw Appl 22, 51–60 (2017). https://doi.org/10.1007/s11036-016-0678-8
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DOI: https://doi.org/10.1007/s11036-016-0678-8