Abstract: Methods and apparatus for generating a codebook for a reconfigurable intelligent surface (RIS) having a plurality of reflective elements (RIS elements). In an example, a method includes determining relative location information regarding a transmitter and the RIS and a receiver and the RIS. Based on the relative location information, angle of arrival information is calculated for signals from the transmitter to the RIS elements, and angle of departure information is calculated for signals from the RIS elements to the receiver. Phase shift information for the RIS elements is calculated based on the angle of arrival and angle of departure information, and is used to select reflection coefficients for the RIS elements such that a transmitted signal is reflected from the RIS to the receiver as a coherent reflected beam. The reflection coefficients are stored as a codeword in a RIS codebook used to configure the RIS elements.

Abstract: Multiple Access Point Coordination (MAPC) is directed to enhance WiFi performance by enabling a set of Access Points (APs) to coordinate with each other through advanced coordinating schemes to reduce inter-AP contention and congestion. A process framework is described which facilitates coordination across multiple-APs using Coordinated Spatial Reuse (C-SR), that reciprocally adjust their scheduling strategy, power control and link adaptation to meet specific Quality of Service (QoS) requirements. A two-layer Multi-Armed Bandit (MAB) approach is described, which also preserves fair use of resources across all nodes. The validity of this approach is confirmed by system level simulations, which validate the improved efficiency in terms of sum-throughput, as well as enhanced fairness.