Over the past decade, there have been great interests in cellular and fixed radio access technologies for providing mobile, nomadic and fixed telecommunication services. The fast pace development of this technology and the challenges it presents due to the increasing number of user equipments and the demand to have the service on-the-go, have presented new challenges on base stations capability and the handover(HO) techniques. To address these challenges intensive researches are being carried out to define algorithms that can handle the HO decisions based on user equipment (UE) requirements and quality of service (QoS) expectations. This paper investigates the improvement steps for HO mechanisms in long term evolution (LTE) system which is being formally submitted as a candidate 4G system. LTE network is expected to support mobility with speeds of up to 500 km/h, when the HO will then become more frequent and fast. The basis of the approach is to reduce the number of unnecessary HOs. The strengths and weaknesses for each algorithmare discussed, and conclusions are subsequently made.
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机译：在过去的十年中，对于提供移动，游牧和固定电信服务的蜂窝和固定无线电接入技术引起了极大的兴趣。随着用户设备数量的增加以及对移动服务的需求，该技术的快速发展及其带来的挑战，给基站能力和切换（HO）技术带来了新的挑战。为了应对这些挑战，正在进行大量研究来定义算法，该算法可以根据用户设备（UE）要求和服务质量（QoS）期望来处理HO决策。本文研究了长期演进（LTE）系统中HO机制的改进步骤，该系统已正式提交为候选4G系统。预计LTE网络将以高达500 km / h的速度支持移动性，届时HO将变得更加频繁和快速。该方法的基础是减少不必要的HO数量。讨论了每种算法的优缺点，并得出了结论。
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