Wireless Access Systems for Wide Area Ubiquitous Network
Shigeru Kuwano, Daisei Uchida, Fusao Nuno, Morikatsu Takahashi · NTT technical review · 2008
Wide area ubiquitous networks should be able to handle more than 0,000 wireless terminals in a large wireless cell with a radius of several kilometers.However, the functions of the wireless terminals will be severely limited because of the requirements for low power consumption and low cost.Therefore, we need a sophisticated wireless access system that uses smart wireless signal processing at the wireless access point, access control, and network control techniques.In this paper, we describe the technical requirements for these technologies and briefly present the technologies that we have developed for the physical layer interface, medium access control, and network control.