Abstract: With the advent of the 5G era, it makes Location-Based Services (LBS) more widely used. However, users will have to also face many privacy leakage issues caused by location-based services while they enjoy the great convenience brought by location-based services. The semantics-based location privacy protection mechanism was proposed in order to increase the security of anonymity, improve data utility, resist attacks with certain background knowledge, and protect users' sensitive information. Firstly, the structure of the privacy protection system and traditional protection technology were introduced. Then, several typical privacy leakage and attack types based on location semantics were analyzed, the location privacy protection requirements combined with location semantics were given, and the key technologies and achievements in the latest research of the semantics-based location privacy protection from two aspects of single-point location privacy protection and trajectory privacy protection were summarized. Finally, the future development trend of technology and the next research work were prospected.

Key words: privacy protection, location semantic, location service, location data, trajectory data

摘要： 5G时代的到来使得基于位置的服务（LBS）应用更加广泛。然而用户在享受LBS带来的巨大便利时，也必须面对由位置服务引发的诸多隐私泄露问题。为了加强匿名的安全性，提高数据效用，对抗拥有一定背景知识的攻击以及保护用户敏感信息，研究者提出基于语义的位置隐私保护机制。首先，对位置隐私保护系统结构和传统的保护技术进行介绍；然后，分析了基于语义的隐私泄露和攻击方式，给出了结合语义的位置隐私保护需求，重点从单点位置隐私保护和轨迹隐私保护两个方面综述了最新基于语义的位置隐私保护研究中的关键技术和成果；最后，对未来技术发展趋势和下一步研究工作进行展望。

关键词: 隐私保护, 位置语义, 位置服务, 位置数据, 轨迹数据