  Reconfigurable intelligent surface (RIS), composed of nearly passive
elements, is regarded as one of the potential paradigms to support
multi-gigabit data in real-time. However, in traditional CSI (channel state
information) driven frame, the training overhead of channel estimation greatly
increases as the number of RIS elements increases to intelligently manipulate
the reflected signals. To conveniently use the reflected signal without complex
CSI feedback, in this paper we propose a position-aided phase configuration
scheme based on the property of Fresnel zone. In particular, we design the
impedance based discrete RIS elements with joint absorption mode and reflection
mode considering the fabrication complexities, which integrated the property of
the Fresnel zone to resist the impact of position error. Then, with joint
absorption and 1-bit reflection mode elements, we develop the two-step
position-aided ON/OFF states judgement (TPOSJ) scheme and the frame structure
to control the ON/OFF state of RIS, followed by analyzing the impacts of
mobility and position error on our proposed scheme. Also, we derive the
Helmholtz-Kirchhoff integral theorem based power flow. Simulations show that
the proposed scheme can manipulate the ON/OFF state intelligently without
complex CSI, thus verifying the practical application of our proposed scheme.
