## 2 Vision and Key Features for Future 6G Networks
In fact, transmitting 3D images without a stereo voice is insufficient to depict the in-person presence characteristics. In the 6G era, reconfigurable stereo audio will motivate the development of a platform for use in capturing several physical presences in each configuration. In other words, ample freedom for entities exists to interact with and modify received holographic data and video if the need arises. Holographic data are expected to consume a high bandwidth and must be delivered over reliable network links [23];
* _Tactile communications:_ Holographic communication makes it possible to transmit a virtual vision of close-to-real sights of people, events, and environments. The cinematic experience will be incomplete without deploying a tactile Internet that would allow the real-time conveyance of an image [24]. Some of the expected beneficiaries of this technology are teleoperation, cooperative automated driving, and interpersonal communication. For these technologies, a haptic touch could be easily implemented using communication networks. Realizing this technology may lead to the abolition of the open systems interconnection network model and the adoption of a cross-layer communication-system design. The cross-layer architecture should meet the stringent needs of these technologies. This circumstance may trigger the design of novel physical layer (PHY) schemes that will enhance the implementation of the signaling system designs and waveform multiplexing. Another aspect that requires attention is how to design procedures such as buffering, queuing, scheduling, handover, and protocols that will meet the needs of 6G networks. Obviously, the existing wireless communication systems are incapable of satisfying these needs; hence, over-the-air fiber communication systems require analysis [25];
* _Human-bond communications:_ Human-centric communication is expected to be one of the main drivers of 6G communication. With this technology, humans are expected to access and/or share physical features or express physical phenomenon as it is. Invariably, the five human senses will be involved in this project. An example of this technology is the \"communication through breath\" project, which makes it feasible to read a human bio-profile using exhaled breath, even the interaction with the human body by inhalation using volatile organic compounds [26]. Consequently, such technology facilitates disease diagnosis, emotion detection, collection of biological features, and remote interaction with the human body. Designing a communication system capable of mimicking the five human senses demands interdisciplinary research collaborations. Such research efforts would naturally result in hybrid communication technologies capable of extracting various physical quantities and then distribute them to the intended receiver via secured channels. Thus, 6G communications are expected to raise the bar currently set by 5G communications with the provision of enhanced services from the perspectives of network data availability, mobile data rate, and seamless ubiquitous connection. In addition, 6G communications will utilize an unusual communication approach to gain acceptance to various mobile data categories and send them via traditional enhanced radio-frequency networks. Such process will allow the novel wireless transmission of feelings with virtual presence and participation. A host of futuristic currently non-existent wireless communication scenarios of the 2030s are predicted in [27], comprising holographic calls and a tactile Internet. 6G will usher in the same reliability as wired networks with a low bit-error-rate considering the type of applications that will be supported. Figure 5 summarizes the key features for future 6G. the THz wireless communications system, AI, and programmable intelligent surfaces are the outstanding concepts among all the blocks listed in Figure 5[28].