Simultaneously with the beginning of the implementation of the fifth generation wireless networks (5G systems), the research of the next generation mobile wireless systems - the sixth generation network 6G, has began. Having in mind the already started considerations on the components of the future 6G technology, it is necessary to follow the given technological trends, which are waiting for us beyond 5G era. This paper will explain the range of communication needs and technologies within the future 6G. 6G is expected to include three main aspects, mobile ultra broadband, super Internet-of-Things (IoT) and Artificial Intelligence (AI). The paper will present an overview of the crucial technology that is planned to achieve the first two aspects. In particular, THz communication could be used to support mobile ultra-broadband, while symbiotic radio and satellite communications to support super IoT. For each technology, the basic basic principle of functioning, key challenges and currently current approaches and solutions will be given. It will be especially emphasized what 6G brings in relation to 5G, ie what are the key new characteristics.