Abstract: A device and method corrects time data based on a clock signal affected by jitter. The error due to jitter in a time measurement of an event in the clock signal is determined at the time of the event or as an average over a number of events. A measurement is made of a time dependent reference variable associated with a long-time constant device, such as a capacitor, which is relatively immune to localized jitter. The measurement may be a reading of the voltage across a charging capacitor. The measured value is compared to an expected value, and the time error is based on the result. The expected value may be stored or calculated from known charging rates of the capacitor. The error due to jitter of a time measurement is approximately linearly proportional to the difference in voltage between the measured and the expected values of the capacitor.

Abstract: In order to provide an electronic communication system (100), in particular an access control system for P[assive]K[eyless]E[ntry], comprising at least one base station (10) being arranged in particular on or in an object to be secured against unauthorized use and/or against unauthorized access, for example being arranged on or in a vehicle and/or on or in an access system, at least one remote device (20), in particular at least one transponder unit, which remote device (20) may in particular be carried with him by an authorized user and/or is designed to exchange data signals (12, 22) with the base station (10), in which case, by means of the data signals (12, 22) the authorization for use and/or for access can be determined and/or the base station (10) can be controlled accordingly, wherein cost and complexity of the remote device (20) are reduced, it is proposed that the remote device (20) comprises at least one recording unit (24) for recording at least part of the data signals (12, 22), in particular for

Abstract: A wireless system coupled to a local area network (LAN) (101). The wireless system provides wireless network services to a wireless communication device disposed in an area within which the wireless system is deployed. A presence detector (301, 302, 303, 304) detects a presence of a user within a detection area. A wireless communication node (201, 202, 203, 204) is operably coupled to the LAN (101) and the presence detector (301, 302, 303, 304). When the presence detector (301, 302, 303, 304) detects the presence of the user within the detection area, the wireless communication node (201, 202, 203, 204) is enabled to provide wireless network services to the wireless communication device.

Abstract: A dongle 4 is attached to a USB port 8 of computer 2 through USB connector 6. The dongle in suspend mode wakes periodically, sends a polling signal, and if it receives a response the dongle enters an active mode. In embodiments, the dongle 4 uses an active scan request as the polling signal and receives a beacon frame as a response. When the dongle enters an active mode after receiving a response the dongle then wakes the computer 2 from its suspend mode. The dongle draws minimal current meeting the USB specifications.

Abstract: A mesh network comprises a plurality of data nodes (a-g, e) configured to make direct data transfers to all other nodes (a-g, e) in the network within transmission range. The invention provides a method for making a secure data transfer from one node to another. Each node has already measured the exact time-of-flight to its neighbours and this information has been supplied to the coordinator node (1) or to the transmitting node (s). The transmitting node (s) can determine the time-of-flight along a number of different routes (A-E) through the mesh. The data to be transmitted is chopped up such that the data taking the longest route (E) is sent first, and the data taking the shortest route (A) is sent last. At the receiving end, the data arrives exactly re-ordered in time, and thus no decoding needs to take place.

Abstract: Method for obtaining range and/or positional information of electronic devices typically rely on a device (A) re-questing that another device (B) supplies a reply message (22), which contains some timing information (T2, T3) on the signals received and sent. Problems that arise in such networks comprise: firstly, some devices (C) may be out of range of the device (A) that initiates the ranging measurements, and secondly, some devices (B, C) may not be allowed to communicate with each other and thus, the distance between these devices cannot be found. This invention discloses that in these cases, eavesdropping on messages (21, 22, 24) passing between other devices (A, B, C) in the system can result in that distances between additional devices are found. Furthermore, by using eavesdropping the number of transmissions, and therefore the potential for collisions, is reduced. Thus, the power consumption of the nodes in the network can be lowered.

Abstract: A network for locating a wireless tag comprises a plurality of wireless nodes. The nodes are not connected together by a wired network. Each node is included in a floor tile for installation inside a building and configured to be wirelessly connectable to at least one other node. When the floor tiles are installed, the plurality of nodes form a mesh or grid and provide overlapping wireless coverage for locating the tag by reference to mesh.

Abstract: A method and apparatus of encrypting data for transmission between first 1 and second 2 communication terminals in which information relating to a time at which a message sent from the first terminal is expected to arrive at the second terminal is determined by an exchange of messages between the first and second terminals. The data is encrypted at the first terminal using the determined information and is transmitted to the second terminal, where it is decrypted based on its actual arrival time.

Abstract: A method of determining the relative position of a secondary station (SS) in a radio system including at least one master station (MS) and a plurality of secondary stations (SS), comprises the master station establishing a master log of the time stamp of signals transmitted by active stations and their identities and active secondary stations (SS) establishing a log of the time stamp of signals transmitted by other stations and their respective measured received quality. One of the active secondary stations forwards its log to the master station and the master station correlates the time stamps in the received log with the time stamps in the master log in order to determine the identities of the transmitters and utilises the measured signal quality indications in the received log to determine the relative position of the secondary station with respect to the locations of the transmitters identified.