Abstract：The ground 5G base station provides low-frequency control signals to complete the control of the initial beam access. The aerial unmanned aerial vehicle(UAV) base station provides data services for the ground users. The heterogeneous network(HetNet) formed by the ground 5G base station and high-altitude UAV becomes an important research direction of integrated communication between heaven and earth in the future. In this paper, based on beam scanning and downlink control pilot multiplexing technology, an initial beam association mechanism for heterogeneous network architecture of UAV is proposed. While the upper and lower bounds of system coverage are given, the deployment optimization parameters corresponding to higher beamforming gain are obtained through simulation evaluation.

Abstract：With the establishment of the national emergency management department, state attaches more importance to emergency communications support after disasters. In order to solve the problem of the destruction of ground communications equipment after the disaster and the inability to guarantee normal communications, the research of quick“Sky to Ground Integrated” network building based on drone base stations has entered the planning and construction period. In order to meet the requirements of large bandwidth, low latency and low cost in the development of tethered type unmanned aerial vehicle(UAV) emergency system, based the key techniques such as large-scale antenna, edge computer and network slicing based on 5G, an emergency communication solution of tethered UAV based on 5G is put forward in this paper. The implementation architecture and key technologies of the scheme are analyzed, and the corresponding conclusion is given.

Abstract：Constructing regional non-public network based on public network is a research hotspot of emergency communication solutions. The existing non-public network architecture defined by the 3GPP standard still has many disadvantages, such as the complexity of the protocol, the difficulty of deployment and configuration, and the poor compatibility of equipment from different manufacturers. Based on demand analysis of regional emergency communication scenarios, this paper proposes a non-public network improvement scheme based on network slice technology. While avoiding the complex perception of the core network of public network and UE to non-public network, this scheme has the advantages of strong compatibility, low deployment cost and quick and simple.

Abstract：Based on the characteristics of suddenness, complexity, dynamics and lack of information of navigation accidents, UAV technology has been organically integrated with China′s navigation accident emergency rescue system, becoming a research hotspot of maritime emergency communication. The user-centered UAV base station group network breaks the traditional base-centered architecture, and selects the set of potential service sites for each user to build a dynamic base station group, so that users can make full use of the diversified gain of potential service sites within the base station group and the cooperation gain between potential service sites. In this paper, a user-centered base station group networking scheme for UAV is proposed, and the user initial access scheme suitable for ship formation scenario is designed and its performance is simulated and evaluated.

Abstract：As an important supplement to the daily communication system, the emergency support communication system plays a vital role in the event of a disaster. Aiming at the requirements of the emergency support system in the event of a disaster, this paper proposes a technical solution based on 5G network slicing. Based on the flexible network customization capabilities of 5G, the performance requirements of various scenarios of the emergency support communication system on the network are analyzed. Based on the typical emergency support communication system architecture, the implementation process of the 5G network slicing of the emergency support system is discussed to realize the priority guarantee of 5G network resources for emergency services, ensure the real-time interaction and sharing of information, and improve the scientificity and timeliness of information decision-making.

Abstract：In order to adapt to the needs of rapid deployment and convenient configuration in 5G emergency communication scene, the terminal, base station, user plane function(UPF), mobile edge computing(MEC), core control and other network devices must be simple, efficient and flexible. In order to quickly build emergency communication private network application scenario, this paper puts forward a scheme of integrated edge fusion technology and equipment implementation，which provides a highly integrated wireless access，data forwarding and edge application service ability for 5G field emergency communication，at the same time, also simplifies the complexity of equipment operations and external network requirements, and improves the service performance of the whole system.

Abstract：Country attaches great importance to the planning and construction of emergency communication network, especially with more attention paid to the UAV(Unmanned Aerial Vehicle) emergency communication technology research. Relative to the 4G network characteristics of the "Try best", 5G with large bandwidth, low latency and high reliability of network capacity,provides a flexible configuration space for performance of a network configuration, and will gradually become the preferred technology meet the demand of emergency communication different scenarios. UAV is proposed in this paper, based on fixed wing type 5G of emergency communication coverage solution. The solution achieves network through the integration of UAV airborne 5G base stations, combined with ground acer station auxiliary. UAV base station downlink coverage and back link budget are simulated，the results show that the proposed solution can meet the demand of remote areas and emergency communication coverage.

Abstract：Emergency communication support requires rapid deployment, quick on-line and simplified configuration process, but the network architecture based on 3GPP standard is too large and complex to meet. Lightweight 5GC aims at referring to the standard architecture, carrying virtualization technology based on the common hardware platform, realizing the decoupling of hardware and software, controlling and forwarding the cloud core network, and reducing the business process and improving the business processing capacity through the integration and tailoring of network element functions, becoming a new solution for the emergency communication industry.Based on the application scenario of emergency communication private network, this paper analyzes the implementation architecture and key technologies of lightweight 5G core network, and explores the deployment scheme based on typical cases of emergency support.