Abstract：In order to save the construction and operation costs of 5G network, many operators actively promote the co-construction and sharing of 5G infrastructure, but the advanced technology and diversified deployment bring challenges to the implementation of the co-construction and sharing of 5G network. While introducing the 5G co-construction and sharing technology, this paper focuses on two different 5G networking scenarios and then elaborates on the roaming technology scheme of core network and discusses the solutions to network co-construction and sharing in the 5G era.

Abstract：The 5G network requires large construction investment and high operation cost, there is a large pressure on 5G industrial income. In order to lower down the cost of network construction and operation, and implement the new idea of “innovation, coordination, green, open, sharing”, more and more operators focus on 5G network sharing which can realize fast service capabilities by efficient network coverage. In this paper, the technology of 5G network sharing will be analyzed thoroughly including basic principle, user experience, impact on the network and potential risk in order to provide some useful reference to operators.

Abstract：There are more and more mobile operators had launched 5G services in 2019, 5G is entering a critical period of commercial deployment globally. Considering the maturity of SA standards, equipment and terminals, 5G shared network is based on the NSA architecture in the initial stage of 5G deployment, so the operators need to consider evolution towards SA phase in order to ensure that the network sharing would last throughout the 5G life cycle. This paper systematically analyzes different evolutions from network complexity, operation and maintenance optimization complexity, user experience and so on, in order to provide an effective guideline for operators to choose the evolution for RAN sharing.

Abstract：Co-construction and sharing technology is an effective means to quickly build a 5G network with wide coverage, excellent technology, low investment, good perception and good experience. This paper focuses on the technical scheme of 5G access network co-construction and sharing, studies the advantages and disadvantages of various technical schemes and applicable scenarios, and analyzes the capability and implementation scheme of NSA′s sharing to SA′s sharing, so as to ensure the future competitiveness of 5G shared network.

Abstract：Recently, operators shift to 5G non-Standalone(NSA)and tend to share radio access network(RAN).In view of the current situation, network selection technology considering frequency priority and frequency priority scheduling, which performs as the general strategy for interoperation in multi-band networking for 5G NSA RAN sharing of single anchor point,is presented in this paper. From the perspective of both 2.1G mobile operator radio access network(MORAN) and 1.8G multi-operator core network(MOCN), user reselection and handover strategy are investigated, through which the interoperation in multi-band networking is implemented.

Abstract：Co-construction and sharing has become a key measure to improve the quality and reduce the cost of 5G mobile network, while the demand of traditional voice service is the basic business of 5G network construction.In this paper, the voice service solutions under different 5G networking modes are discussed, and the VoLTE voice service capability under the shared networking mode of 5G NSA access network is deeply studied. Two technical solutions, VoLTE being carried in the 4G shared anchor point plot of the contractor or in the belonging 4G plot, are proposed.

Abstract：5G Network has huge investment and high operation cost. Our country actively promotes the construction and sharing of 5G infrastructure to achieve cost reduction and efficiency increase. Chinese operators actively respond to the "5G Leading" strategic requirements put forward by the State Council of China, strive to explore the 5G network co-construction and sharing technology and scheme, and build a national 5G network through "innovation, opening and sharing" to meet the needs of people in different regions and at different stages of development. This paper systematically summarizes the important aspects of 5G network co-construction and sharing from the aspects of 5G network co-construction and sharing strategy, significance, classification, foreign cases, technical solutions, evolution routes, network planning, site construction, 4G/5G coordination and collaboration, and voice solutions etc.