Abstract: The invention is related to a system that includes an integrated system for online and real-time authentication of documents using uniquely generated codes and the verification of the authenticity of the documents using online verification data identified by the unique codes. The invention contains 3 independent claims. In this invention, the unique code (3.8) uniquely identifies a document issued by any organization for any type of documents in any part of the world, and uniqueness is guaranteed. The invention also uses another type of code, a 16 hexadecimal digit code (3.7), which is unique across all documents belonging to a single organization. The invention also uses a KAPTCHA code (3.5), which safeguards the document against auto scan and image processing and optical character recognition. The unique code (3.8) is embedded within a technology convenient for hiding, encrypting and easy readability of the code, which can be one of a quick response (QR) two dimensional code (3.

Abstract: In a wireless communication network, to reduce the polling overhead it is proposed to poll several stations using the same polling frame. In order to be able to poll more than one station in the same frame, an access point can make use of the locations of stations relative to the access point. The location of each station relative to the access point will cause a different propagation delay for radio communications between the station and the access point. Based on the propagation delays, two or more stations may be grouped together for subsequent transmissions to the access point.

Abstract: In a wireless communication network, to reduce the polling overhead it is proposed to poll several stations using the same polling frame. In order to be able to poll more than one station in the same frame, an access point can make use of the locations of stations relative to the access point. The location of each station relative to the access point will cause a different propagation delay for radio communications between the station and the access point. Based on the propagation delays, two or more stations may be grouped together for subsequent transmissions to the access point.

Abstract: A wireless communication system timing introduces a timing advance calculation mechanism. The timing advance calculation mechanism allows a communication device in the system to adjust its transmission timing to ensure reliable receipt of its transmissions at a receiver. The timing advance calculation mechanism is based on exchanging two new media access control layer messages between the transmitter and the receiver. The procedure is triggered by the transmitter planning to associate with a network managed by the receiver.