Linh Dao Manh et al., International Journal of Emerging Trends in Engineering Research, 9(3), March 2021, 158 – 162 158 ABSTRACT In High-speed and seamless access is the goal of next-generation mobile communication systems, especially for VoIP and multimedia services. The supported mobile speeds are expected to reach 500 km/h in the Fifth Generation Networks (5G), lead to the handover will take place continuously as the mobile user moves through the cells. Therefore, efficient radio resource management, including the handover, load balancing technologies is vital problems. In this work, we perform a comprehensive survey of advanced handover techniques in the next-generation mobile communication system (5G) as well as requirements and features for the LTE-Advanced system. In the LTE-Advanced system, Fractional Soft Handover (FSHO) with 5 CCs improves latency and better handover quantity when not using CA. Currently, the proposed handover techniques have many advantages but have not yet resolved important issues in the handover process. Therefore, new handover techniques are required to support a fast and seamless handover process in the LTE-Advanced system. As a result, an advanced transfer technique proposed by combining FSHO, SSHO techniques can reduce latency, enhance efficiency and reliability, especially in the border areas between the cells. Key words: LTE-Advanced, Handover, 5G. 1. INTRODUCTION With along the increasing number of mobile devices, while the new generation mobile information system requires support for high-speed mobile access devices [1]. As a result, the number of handover in the system will increase rapidly. In cellular communication networks, handover can be defined as the process of establishing a wireless connection from the source cell to the target cell on the base station (BS), ensuring seamless the call. Mobile users are not interrupted while moving from the coverage area of a source cell to the coverage area of a target cell, Figure 1. The quality of the handover depends on the quality of the signal made to both the uplinks and downlinks direction of the radio link, even when the subscriber is still within the coverage of a cell but due to the subscriber density of this cell is so large lead to this call may be routed to a lower density adjacent cell to ensure good call quality. During a call, there can be many handovers, this number depends on the mobility speed of the mobile user. So handover is an important issue, is the key to mobile technologies. If the handover problem cannot be solved, there will be no mobility world. Fast and seamless connection with minimal delay in handover process under different mobility speeds of different terminals is one of the significant problems of new generation mobile communication systems. With the development of multimedia services and broadband wireless applications, it will require higher data rates and wider coverage. As a result, fast and robust handover is always required in all mobile communication systems. The LTE-Advanced system is initiated and standardized into the next-generation communication system of 5G networks. Figure 1: Illustration of Handover in 5G The LTE-Advanced system is expected to meet and exceed the requirements proposed by the ITU. Support for high-speed mobility is one of the requirements that must be achieved in 5G. The LTE-Advanced system can support mobility speeds up to 500 km / h. Furthermore, LTE-Advanced will support high data rates up to 1Gbps with downlink (DL) and up to 500Mbps with uplink (UL). In addition, the antenna specifications in the LTE-Advanced system are enhanced by the handover mechanism in the link layer, allowing for reduced handover interruptions [2]. Nowadays, The handover techniques in the LTE-Advanced system are based entirely on hard handover. This technique is simpler and less complicated than the soft and softer handover technique. However, hard handover has some limitations such as the high probability of data loss, time of interruption and high probability of power failure, carrier interference. As a result, this technique has difficulty maintaining the quality of service (QoS) in networks with very high terminals moving at very high mobility due to high delay during handover [3]. Advanced Handover Techniques in 5G LTE-A Networks Linh Dao Manh, Nam Vi Hoai, Quy Vu Khanh Faculty of Information Technology, Hung Yen University of Technology and Education, Hung Yen, Vietnam daolinh1289@gmail.com, vihoainam@utehy.edu.vn, quyvk@utehy.edu.vn ISSN 2347 - 3983 Volume 9. No. 3, March 2021 International Journal of Emerging Trends in Engineering Research Available Online at http://www.warse.org/IJETER/static/pdf/file/ijeter01932021.pdf https://doi.org/10.30534/ijeter/2021/01932021