Abstract: A method of decentralized medium access control in a communications network consisting of a plurality of stations, wherein a sending station transmits a reservation request for a future transmission to an intended receiving station, said intended receiving station being in a reception range of said sending station, said reservation request signalling reservation information including starting point and duration of the transmission, defining a time period of said future transmission, and, in case of a multi-channel system, frequency or code of the channel of said future transmission, so establishing a reservation, and stations active in said reception range overhear said reservation request and other stations than said intended receiving station perform the actions of storing said reservation information locally and defer from medium access during the time period and on the channel of the future transmission.

Abstract: In an Access Point controlled wireless network, wherein one channel communication is ruled by an identifier associated with the Access Point, a method for direct communication between a first station and a second station, includes generating a second identifier by the first station, different from the identifier associated with the Access Point, and optionally choosing a different channel; sending, by the first station, an invitation message for direct communication carrying the second identifier and optionally the second channel to the second station; sending, by the second station, a response message acknowledging the invitation message; setting up direct communication between the first station and the second station using the second identifier and optionally the second channel.

Abstract: The present invention relates to the connection of subnets which operate on different frequency channels and are connected by wireless forwarder stations. According to the present invention, a forwarding station periodically switches to the other frequency channel to remain there for a pre-defined presence duration, whereby jitters of the presence time caused by overlapping packet transmissions are compensated. According to the present invention, a presence and absence time of the forwarder station in the respective subnet is indicated by using signals relating to a power saving mechanism.

Abstract: The application describes an X-ray detector for use in a medical equipment, wherein the detector comprises an unit for transforming X-ray radiation into electrical charge, a first capacitor for being charged by an electrical charge, wherein the first capacitor is electrically connected to the unit for transforming, a second capacitor for being charged by an electrical charge, and a first gain switching gate, wherein the second capacitor is electrically connected with the unit for transforming if the first gain switching gate is in on-state, wherein the detector is adapted to switch on the first gain switching gate for short periods. Further the application describes an X-ray system comprising a detector according to the invention, wherein the system is adapted for gain selection, wherein the detector is adapted to switch on the first gain switching gate for short periods.

Abstract: A method of providing a medium access control protocol using a listen before-talk scheme within a wireless network having a plurality of stations communicating over a channel, wherein a valid route from a source station to a destination station via at least one more station is determined, said method comprising: transmitting a data packet over said channel by a first station; receiving said data packet in a second station; analyzing data in said data packet by said second station whether said data packet is to be forwarded further; and if said data packet is to be forwarded further, prioritizing transmission of said data packet on said valid route.

Abstract: The application describes an X-ray detector for use in a medical equipment, wherein the detector comprises an unit for transforming X-ray radiation into electrical charge, a first capacitor for being charged by an electrical charge, wherein the first capacitor is electrically connected to the unit for transforming, a second capacitor for being charged by an electrical charge, and a first gain switching gate, wherein the second capacitor is electrically connected with the unit for transforming if the first gain switching gate is in on-state, wherein the detector is adapted to switch on the first gain switching gate for short periods. Further the application describes an X-ray system comprising a detector according to the invention, wherein the system is adapted for gain selection, wherein the detector is adapted to switch on the first gain switching gate for short periods.

Abstract: Mobile devices (121, 122, . . . , 12n) are handed off in overlapping cells (181, 182, . . . , 18n) by tracking a velocity (speed and direction) of movement of any number of the mobile devices (121, 122, . . . , 12n). Access points (141, 142, . . . , 14n) are each located in an associated operational cell (181, 182, . . . , 18n) and each operates at a dedicated frequency. The initial signal strengths are measured in advance at predefined locations within a defined space (16) to define signal strengths as location map (42). A nearby initial access point (typically the nearest) and at least two nearby (typically next nearest) access points are assigned for one of the mobile devices (121, 122, . . . , 12n), and the frequencies of each access point identified. A tracking processor (50) periodically scans the frequencies of the nearby access points to determine the location velocity of the mobile device and predict when a handoff will be appropriate. E.g.

Abstract: Systems and methods for data acquisition in computed tomography (CT) applications are provided. The systems and methods are particularly adapted for scanning and acquiring/processing data in connection with high-power cone-beam CT applications. The electron beam is moved/scanned along the anode surface to multiple focal positions. Data acquisition for a full projection at one focus position and one view angle is achieved by activating each focus position multiple times during the data acquisition for one angle of the gantry. The detector array and associated data processing system are adapted to rapidly switch between the different focus positions during the acquisitions for one view angle and to collect all data belonging to the same projection into the same data set. Adaptive electron optics are utilized to move/scan the electron beam along the anode surface to the various focus positions.

Abstract: Systems and methods for data acquisition in computed tomography (CT) applications are provided. The systems and methods are particularly adapted for scanning and acquiring/processing data in connection with high-power cone-beam CT applications. The electron beam is moved/scanned along the anode surface to multiple focal positions. Data acquisition for a full projection at one focus position and one view angle is achieved by activating each focus position multiple times during the data acquisition for one angle of the gantry. The detector array and associated data processing system are adapted to rapidly switch between the different focus positions during the acquisitions for one view angle and to collect all data belonging to the same projection into the same data set. Adaptive electron optics are utilized to move/scan the electron beam along the anode surface to the various focus positions.

Abstract: Mobile devices (121, 122, . . . , 12n) are handed off in overlapping cells (181, 182, . . . , 18n) by tracking a velocity (speed and direction) of movement of any number of the mobile devices (121, 122, . . . , 12n). Access points (141, 142, . . . , 14n) are each located in an associated operational cell (181, 182, . . . , 18n) and each operates at a dedicated frequency. The initial signal strengths are measured in advance at predefined locations within a defined space (16) to define signal strengths as location map (42). A nearby initial access point (typically the nearest) and at least two nearby (typically next nearest) access points are assigned for one of the mobile devices (121, 122, . . . , 12n), and the frequencies of each access point identified. A tracking processor (50) periodically scans the frequencies of the nearby access points to determine the location velocity of the mobile device and predict when a handoff will be appropriate. E.g.

Abstract: A method of decentralized medium access control in a communications network consisting of a plurality of stations, wherein a sending station transmits a reservation request for a future transmission to an intended receiving station, said intended receiving station being in a reception range of said sending station, said reservation request signalling reservation information including starting point and duration of the transmission, defining a time period of said future transmission, and, in case of a multi-channel system, frequency or code of the channel of said future transmission, so establishing a reservation, and stations active in said reception range overhear said reservation request and other stations than said intended receiving station perform the actions of storing said reservation information locally and defer from medium access during the time period and on the channel of the future transmission.

Abstract: In an Access Point controlled wireless network, wherein one channel communication is ruled by an identifier associated with the Access Point, method for direct communication between a first station and a second station, comprises the steps of: generating a second identifier by said first station, different from the identifier associated with the Access Point, and optionally choosing a different channel; sending, by said first station, an invitation message for direct communication carrying said second identifier and optionally said second channel to said second station; sending, by said second station, a response message acknowledging the invitation message; setting up direct communication between said first station and said second station using said second identifier and optionally said second channel.

Abstract: The present invention provides a mobile device and a method for generating and maintaining a signal strength database that provides an assignment between a location within a building and corresponding signal strengths of signals that are emitted by a plurality of access points of a wireless data communication network. The inventive mobile device is adapted to determine its own position by making use of a trigonometric technique on the basis of dedicated reference points or access points of the network. The mobile device is further adapted to measure the signal strength of signals being transmitted by the plurality of access points. A determined position of the mobile device is then assigned to a set of measured signal strengths and stored as an entry of the database. Preferably, the mobile device is attached to a trolley like device that is subject to frequent movement through a building.

Abstract: A method of providing a medium access control protocol using a listen before-talk scheme within a wireless network having a plurality of stations communicating over a channel, wherein a valid route from a source station to a destination station via at least one more station is determined, said method comprising: transmitting a data packet over said channel by a first station; receiving said data packet in a second station; analyzing data in said data packet by said second station whether said data packet is to be forwarded further; and if said data packet is to be forwarded further, prioritizing transmission of said data packet on said valid route.

Abstract: The present invention relates to the connection of subnets which operate on different frequency channels and are connected by wireless forwarder stations. According to the present invention, a forwarding station periodically switches to the other frequency channel to remain there for a pre-defined presence duration, whereby jitters of the presence time caused by overlapping packet transmissions are compensated. According to the present invention, a presence and absence time of the forwarder station in the respective subnet is indicated by using signals relating to a power saving mechanism.