Abstract: A software-defined radio system has a plurality of fixed radio receivers each operable to receive radio signals in a receiving band, to sample a received radio signal to produce a sample stream, and to send the sample stream over a network. The radio system includes at least one fixed sync signal transmitter operable to transmit predetermined sync signals in said receiving band to receivers of the aforementioned plurality. The radio system further comprises a data processing system which is connected to the network for receiving sample streams from the receivers. The data processing system is operable to align samples of a data signal contained in sample streams from different receivers by: detecting a sync signal in those sample streams; determining a timing offset between samples of the sync signal in those sample streams in dependence on predetermined locations of the different receivers and the transmitter of that sync signal; and aligning the samples of the data signal in dependence on the timing offset.

Abstract: Embodiments of the present invention may provide the capability to personalize end devices over-the-air (OTA) without the involvement of device manufacturers, for example, in a federated large scale wireless IoT network, such as LoRaWAN. Preset with factory settings, end devices may securely connect to the network before they are finally personalized for their target service. Security sensitive personalization information may only be exchanged between device and service provider. The process may require relatively little effort by the network operator and end customers, may lower personalization costs, and may provide a security model that is attractive for a wide range of IoT applications.

Abstract: A software-defined radio system has a plurality of fixed radio receivers each operable to receive radio signals in a receiving band, to sample a received radio signal to produce a sample stream, and to send the sample stream over a network. The radio system includes at least one fixed sync signal transmitter operable to transmit predetermined sync signals in said receiving band to receivers of the aforementioned plurality. The radio system further comprises a data processing system which is connected to the network for receiving sample streams from the receivers. The data processing system is operable to align samples of a data signal contained in sample streams from different receivers by: detecting a sync signal in those sample streams; determining a timing offset between samples of the sync signal in those sample streams in dependence on predetermined locations of the different receivers and the transmitter of that sync signal; and aligning the samples of the data signal in dependence on the timing offset.

Abstract: A software-defined radio system has a plurality of fixed radio receivers each operable to receive radio signals in a receiving band, to sample a received radio signal to produce a sample stream, and to send the sample stream over a network. The radio system includes at least one fixed sync signal transmitter operable to transmit predetermined sync signals in said receiving band to receivers of the aforementioned plurality. The radio system further comprises a data processing system which is connected to the network for receiving sample streams from the receivers. The data processing system is operable to align samples of a data signal contained in sample streams from different receivers by: detecting a sync signal in those sample streams; determining a timing offset between samples of the sync signal in those sample streams in dependence on predetermined locations of the different receivers and the transmitter of that sync signal; and aligning the samples of the data signal in dependence on the timing offset.

Abstract: Method for managing power consumption in tree-based, Time-Division Multiple Access (TDMA), multi-hop wireless networks. The method includes at each node set the steps of: relinquishing its initial role in the network if a condition related to the power consumption of the node is not met; and adopting a new role in the network according to a TDMA protocol of said network; wherein the node stops emitting beacons to a child node thereof and/or stops acknowledging beacons from a parent node, and wherein each node has a lower power consumption in this new role than it had in its initial role.

Abstract: Embodiments of the present invention may provide the capability to personalize end devices over-the-air (OTA) without the involvement of device manufacturers, for example, in a federated large scale wireless IoT network, such as LoRaWAN. Preset with factory settings, end devices may securely connect to the network before they are finally personalized for their target service. Security sensitive personalization information may only be exchanged between device and service provider. The process may require relatively little effort by the network operator and end customers, may lower personalization costs, and may provide a security model that is attractive for a wide range of IoT applications.

Abstract: A software-defined radio system has a plurality of fixed radio receivers each operable to receive radio signals in a receiving band, to sample a received radio signal to produce a sample stream, and to send the sample stream over a network. The radio system includes at least one fixed sync signal transmitter operable to transmit predetermined sync signals in said receiving band to receivers of the aforementioned plurality. The radio system further comprises a data processing system which is connected to the network for receiving sample streams from the receivers. The data processing system is operable to align samples of a data signal contained in sample streams from different receivers by: detecting a sync signal in those sample streams; determining a timing offset between samples of the sync signal in those sample streams in dependence on predetermined locations of the different receivers and the transmitter of that sync signal; and aligning the samples of the data signal in dependence on the timing offset.

Abstract: Method for managing power consumption in tree-based, Time-Division Multiple Access (TDMA), multi-hop wireless networks. The method includes at each node set the steps of: relinquishing its initial role in the network if a condition related to the power consumption of the node is not met; and adopting a new role in the network according to a TDMA protocol of said network; wherein the node stops emitting beacons to a child node thereof and/or stops acknowledging beacons from a parent node, and wherein each node has a lower power consumption in this new role than it had in its initial role.

Abstract: A method for synchronizing nodes of a multi-hop network with a Time Division Multiplex Access scheme (TDMA), the nodes being hierarchically arranged in different levels, including a step of organizing the TDMA by periodic superframes, the respective superframe having a number of frames including at least a broadcast frame, a step of providing the respective broadcast frame with a number of slots, the number of slots being equal to a number of parent nodes in the multi-hop network, a step of assigning each parent node one slot in the broadcast frame in dependence on its level, and a step of distributing a synchronization information to the parent nodes by means of the broadcast frame, respectively.

Abstract: A method for synchronizing nodes of a multi-hop network with a Time Division Multiplex Access scheme (TDMA), the nodes being hierarchically arranged in different levels, including a step of organizing the TDMA by periodic superframes, the respective superframe having a number of frames including at least a broadcast frame, a step of providing the respective broadcast frame with a number of slots, the number of slots being equal to a number of parent nodes in the multi-hop network, a step of assigning each parent node one slot in the broadcast frame in dependence on its level, and a step of distributing a synchronization information to the parent nodes by means of the broadcast frame, respectively.

Abstract: Embodiments of the present invention include methods for retrieving information from an information base. In one embodiment, the present invention includes specifying a first query including one or more specified attribute values corresponding to one or more attributes, performing a count-only query on a structured information base for information elements having one or more attribute values within a first range, the first range including the specified attribute values, and performing a retrieval query for information elements having one or more attribute values within a second range, wherein the second range includes the first range.