IMS Case of China Telecom, Fujian
Customer Challenges
- More and more subscribers are choosing to use mobile services, resulting in the revenue from fixed-line calls falling by 8% year on year.
- Faced with fierce competition from China Mobile and China Unicom, Fujian Telecom was eager to provide more unique services.
- The legacy PSTN can provide only voice. It cannot meet user requirements for video and multimedia services.
Huawei Solution
Huawei offered its PSTN transformation solution. The target IMS network is flat and supports All IP. The transformation helps reduce power consumption and maintenance costs.
Customer Benefits
- The target IMS network inherits all services on the live PSTN and delivers the same user experience for services (such as the attendant console service) to government and enterprise customers. The IMS network provides a unified maintenance platform, which reduces maintenance costs and helps build a unified brand for Fujian Telecom.
- The IMS network provides fixed mobile convergence (FMC) services and differentiated services to meet Fujian Telecom's multi-service requirements.
In 2010, Fujian Telecom Quanzhou branch Telecom started PSTN network reconstruction based on an IMS pilot test. The target IMS network fully inherits all services on the live network, including the customized secretary service. In addition, the IMS network delivers the same service experience as that offered by the PSTN. To provide intelligent network (IN) services for IMS subscribers, the IP multimedia service switching function (IM-SSF) is deployed to interwork with the existing service control point (SCP), supporting multiple service nesting.
During this large-scale network reconstruction, Huawei cooperated with Fujian Telecom Quanzhou branch in working out an end-to-end solution for migration subscribers from the live PSTN to the IMS network. The target network supports various subscriber access modes, for example, access using the SIP passive optical network (PON), access gateway control function (AGCF), IP private branch exchange (PBX), and V5. Multiple subscriber data migration tools were also provided to ensure smooth migration. The element management system (EMS) was used to manage IMS network elements in a unified manner, laying the foundation for large-scale commercial deployment.
Complying with China Telecom's optical-in and copper-out deployment strategy, Fujian Telecom Quanzhou branch focused on the development of the IMS+PON construction mode, which provides subscribers with voice, Internet access, IPTV, video surveillance, video phone, video conference, and e-surfing Live. In this way, high-bandwidth access capability is converted to IMS services and service capabilities.
IMS is future-oriented and FMC-supported network architecture. As dominant technology during IP transformation for networks, IMS is deemed to be an important initiative in full-service strategies. The three largest operators in China, China Mobile, China Telecom, and China Unicom, are all speeding up their construction in the IMS field. China Mobile and China Telecom have already set up IMS pilots, and China Unicom has completed its first-phase field test.