Abstract：The diversified demand of vertical industry application brings about more abundant network construction mode. Small cell on 5G open platform have advantages such as openness, flexibility and cost performance, which will contribute to the efficient development of 5G infrastructure network construction. Based on the analysis of the challenges and trends of indoor coverage in 5G era, a solution of 5G digital indoor coverage based on open platform small base station is proposed to deal with the current situation, and its application in typical industries is discussed.

Abstract：Chinese operators respond to the strategic requirements of the State Council and promote co-construction and sharing of 5G infrastructure to reduce costs and increase efficiency. Outdoor 5G sharing technology has matured, and trial operations have been carried out nationwide with good results. 5G construction will gradually infiltrate from wide outdoor coverage to indoor fine coverage, and efforts to explore 5G indoor coverage co-construction and sharing technologies and solutions are imperative. This article expounds the classification, technical solutions, evolution route, voice solution, indoor and outdoor collaboration and interference avoidance of 5G indoor coverage co-construction sharing.

Abstract：In the 5G era, with the development of small base stations based on general purpose servers, the virtualization of wireless access network using open technology provides a new direction for further improving the utilization rate and deployment efficiency of communication facilities. This paper firstly analyzes the structure of the new 5G small base station based on the general server and then analyzes the typical scenarios for deployment of the small base station. In the second part, the paper introduces the common characteristics and the applications of virtualization technology. Considering the current status of telecommunication industry of virtualization, the differences between the applications for virtualization infrastructure requirements are discussed, which is suitable for small base station for typical scenarios. The last part gives the analysis of complete virtualization platform architecture and future development prospect.

Abstract：The Ministry of Industy and Information Technology granted 5G licenses to relevant operators on June 6,2019, marking China′s entry into the first year of 5G commercialization. 5G is set to be a new round of disruptive revolution in information technology, with significant advantages including high speed, large capacity, and low delay. So it also puts forward some stringent technical requirements such as high bandwidth and low delay for 5G fronthaul network. Therefore，based on the comprehensive analysis of 5G new features of business and architecture, 5G carrying demand characteristics, etc., this paper proposes four kinds of prequel carrying solutions, analyzes their advantages and disadvantages and application scenarios, and summarizes suggestions on 5G fronthaul transmission solutions applicable to different scenarios.

Abstract：In order to promote the deployment and application of 5G home cell, and solve the clock synchronization problem in family scenarios, clock synchronization schemes of 4G home cell are studied, and the 5G PON-based(Passive Optical Network) clock synchronization scheme is proposed. Current schemes are compared with each other, and laboratory test results based on the PON synchronization scheme are illustrated. Finally, development recommendations for the clock synchronization scheme of the 5G home cell are summarized.