关于IMS网络互联互通的解读 - Interpretation of IMS network interconnection and intercommunication

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IMS网络是顺应网络IP化趋势，为用户提供多媒体服务的电信网络。工业和信息化部组织中国电信、中国移动、中国联通开展IMS网络互联互通工作，于2021年8月完成全国移动通信网IMS网络互联互通部署，正式为用户提供服务。

1、电信网互联互通是什么？

《公用电信网间互联管理规定》中定义，电信网互联是指建立电信网间的有效通信连接，以使一个电信业务经营者的用户能够与另一个电信业务经营者的用户相互通信或者能够使用另一个电信业务经营者的各种电信业务。

中国电信、中国移动、中国联通等运营商的通信网络已实现互联互通。

2、IMS网络是什么？

IMS(IP Multimedia Subsystem)即IP多媒体子系统, 是利用IP技术在运营商网络上构建的分层、开放、融合的通信核心网。通过IMS网络，用户可以享受高清音/视频通话、视频彩铃、电话会议等丰富的电信级多媒体服务。目前，中国电信、中国移动、中国联通均已完成IMS网络部署。

3、IMS网络在经济社会发展中发挥哪些重要作用？

《中华人民共和国国民经济和社会发展第十四个五年规划和2035年远景目标纲要》中提出加快数字化发展，建设数字中国，推进网络强国建设，加快5G网络规模化部署。IMS网络承载5G VoNR音/视频等业务, 为用户提供更高质量的电信服务，对于5G网络建设发展具有基础支撑作用，为未来发展新型电信业务奠定良好基础。

4、IMS网络互联互通为用户通信体验带来哪些提升？

IMS网络互联互通后，4G/5G用户的网间通信体验将显著提升。一是有效降低网间话务呼叫时延，减少用户跨运营商通信等待时间；二是明显提升网间通话质量，音频还原度更高，用户听到的声音更加真实；三是支持更加丰富的多媒体应用，用户可以跨运营商使用视频通话、视频彩铃等业务。

5、工业和信息化部就IMS网络互联互通组织开展哪些工作？

2019年2月，工业和信息化部在湖南、四川两省组织开展IMS网络互联互通试点工作。

2020年5月，在两省试点取得成功的基础上，工业和信息化部决定在全国推广IMS网络互联互通。

在工业和信息化部组织下，中国电信、中国移动、中国联通及中国信息通信研究院研究制定技术方案、测试规范及10余项行业标准，开展网间测试10万余次，覆盖五个主流设备厂家十余种网元设备，分批次有序完成业务割接调整。

2021年8月，全国移动通信网IMS网络实现IP化互联互通，正式为用户提供服务。

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The IMS network is a telecommunication network that conforms to the IP trend of the network and provides users with multimedia services. The Ministry of Industry and Information Technology organized China Telecom, China Mobile, and China Unicom to carry out IMS network interconnection and interoperability. In August 2021, the national mobile communication network IMS network interconnection deployment will be completed, and the service will be officially provided to users.

1. What is the interconnection of telecommunications networks?

As defined in the “Administrative Regulations on the Interconnection of Public Telecommunications Networks”, telecommunications network interconnection refers to the establishment of effective communication connections between telecommunications networks so that users of one telecommunications business operator can communicate with or use another telecommunications business operator. Various telecommunication services of another telecommunication service operator.

The communication networks of operators such as China Telecom, China Mobile, and China Unicom have achieved interconnection and interoperability.

2. What is the IMS network?

IMS (IP Multimedia Subsystem) is the IP multimedia subsystem, which is a hierarchical, open and converged communication core network constructed on the operator’s network using IP technology. Through the IMS network, users can enjoy rich carrier-grade multimedia services such as high-definition audio/video calls, video ring back tones, and teleconferences. Currently, China Telecom, China Mobile, and China Unicom have all completed IMS network deployment.

3. What important role does IMS network play in economic and social development?

The “14th Five-Year Plan for the National Economic and Social Development of the People’s Republic of China and the Outline of Long-Term Goals for 2035” proposes to accelerate digital development, build a digital China, promote the construction of a network power, and accelerate the large-scale deployment of 5G networks. The IMS network carries 5G VoNR audio/video services, provides users with higher-quality telecommunications services, has a fundamental support role for the development of 5G networks, and lays a good foundation for the development of new telecommunications services in the future.

4. What improvements does IMS network interconnection bring to the user’s communication experience?

After the IMS network is interconnected, the inter-network communication experience of 4G/5G users will be significantly improved. The first is to effectively reduce the delay of inter-network traffic calls and reduce the waiting time for users to communicate across operators; the second is to significantly improve the quality of inter-network calls, with higher audio reproduction, and more real voices heard by users; third, more abundant support For multimedia applications, users can use services such as video calls and video ring back tones across operators.

5. What work does the Ministry of Industry and Information Technology carry out on IMS network interconnection and interoperability?

In February 2019, the Ministry of Industry and Information Technology organized pilot projects for IMS network interconnection in Hunan and Sichuan provinces.

In May 2020, on the basis of the successful pilot projects in the two provinces, the Ministry of Industry and Information Technology decided to promote IMS network interconnection across the country.

Under the organization of the Ministry of Industry and Information Technology, China Telecom, China Mobile, China Unicom and China Academy of Information and Communications Technology researched and formulated technical solutions, test specifications and more than 10 industry standards, and carried out more than 100,000 inter-network tests, covering five mainstreams Equipment manufacturers have more than ten types of network element equipment, and they have completed business cutover adjustments in batches and orderly.

In August 2021, the IMS network of the national mobile communication network will realize IP-based interconnection and formally provide services to users.