Editorial: Future Wireless Internet Technology and its Applications

Cheng Li, Shiwen Mao
2018 Journal on spesial topics in mobile networks and applications  
The rapid evolution of wireless communications and wireless networking technologies has made wireless Internet become a reality. The trend has been much augmented by the everincreasing popularity of the latest smart phones and devices, and the availability of Internet access through WiFi, hotspot and cellular data. People are now able to communicate and connect with each other when on the move. In future, the wireless Internet may consist of all types of wireless networks and will connect a
more » ... e number of users and huge number of devices. There is a strong need to reflect the technology advances in different areas in wireless networks, ranging from medium access control protocol design, channel assignments, resource allocation, to routing and data forwarding, and to the overall system level design issues for mobility management on the Internet. This special issue features six selected high-quality research articles on future wireless Internet and its applications. The first article, Be-LBT: an Enhanced Listen Before Talk Mechanism for Collision Avoidance in an LTE-U and WiFi Coexistence System^, authored by Jun Zheng et al., studies the hidden-node problem in downlink transmission of an LTE-U and WiFi coexistence system operating in unlicensed bands. An enhanced LTE-U node structure is first presented, followed by the refinement of the RRC and MAC functional blocks in both LTE-U eNB and LTE-U UE. An enhanced listen-before-talk (e-LBT) mechanism, which incorporates an RTS/CTS handshaking procedure in the basic LBT mechanism, is introduced to enhance this process. The second article titled BAn Adaptive Bi-Threshold-Based On-Demand Energy-Efficient Multicast Routing Protocol for Wireless Ad Hoc and Sensor Networks^, authored by Huang and Zhang, proposed an adaptive bi-threshold-based ondemand energy-efficient multicast routing protocol to achieve reduced energy consumption and prolonged network lifetime. The approach is based on two thresholds: the link power threshold, which is to avoid use of over-long links in a multicast tree so as to reduce the total power for multicasting data packets; and the energy protection threshold, which is used to discourage energy critical nodes from joining a multicast tree as relay nodes. Ondemand energy-efficient multicast tree constructions can be effectively achieved and be adaptively updated as network evolves. In the third article BPrecoding Design for Full-Duplex Transmission in Millimeter Wave Relay Backhaul^, Shuai Han et al. consider an full-duplex (FD) mmWave relay backhaul system and study the self-interference (SI) problem of FD communication. Considering the special mmWave MIMO structure limitation, two SI cancellation precoding algorithms are proposed to eliminate the SI in the system and achieve high spectral efficiency. The decoupled analog-digital algorithm eliminates the SI by utilizing the zero space of the channel, and the enhanced algorithm achieves higher performance. Underwater communication and networking presents an increasingly interested field of research with the advent of the Internet of Underwater Things. The fourth article titled BIntegrating Localization and Energy-Awareness: A Novel Geographic Routing Protocol for Underwater Wireless Sensor Networks^, authored by Hao Kun et al., presents a new energy-efficient localization-based geographic routing protocol, which uses location information and residual energy of sensor nodes to greedily forward data packets to sink nodes. The proposed scheme periodically updates the location information of nodes in an underwater sensor network and effectively adapt to the dynamic topological changes of the network. The normalized advancement of sensor nodes are considered to determine their transmission priority levels. It has been shown through the work that the proposed method can effectively locate sensor nodes while improving the packet delivery ratio and reducing the energy consumption. Efficient resource access in cognitive radio networks, where a large number of secondary users present, is a challenging problem. In the article titled BA New Energy Efficiency/
doi:10.1007/s11036-018-1108-x fatcat:ne6jj3bninh3ba7oy2newpegsa