Abstract: The present invention provides an antenna structure, an antenna device and a wireless localization method. The antenna structure includes a first radiation unit including a plurality of first connecting portions and a plurality of first annular radiation portions, a second radiation unit including a plurality of second connecting portions and a plurality of second annular radiation portions, a first conductive wire and a plurality of second conductive wires. A first end of each first annular radiation portion is connected to the first connecting portion, and the second end thereof extends towards the first end of the adjacent first annular radiation portion. A first end of each second annular radiation portion is connected to the second connecting portion, and the second end thereof extends towards the first end of the adjacent second annular radiation portion.

Abstract: A random access method in a beam division multiple access (BDMA) system including: receiving, by a terminal, a reference signal of at least one beam sector transmitted from an access point (AP) device; estimating, by the terminal, whether the terminal is in a center area of the beam sector provided by the AP device or in the boundary area of the beam sector by using the strength of the reference signal; transmitting, by the terminal, a different preamble to the AP device in accordance with location information of whether the terminal is located in the center area or in the boundary area; and determining, by the AP device, a target beam sector for transmitting information about uplink resources to be used by the terminal, among a plurality of beam sectors on the basis of the received preamble.

Abstract: A periodic quiet interval is provided for base stations attempting to access a shared transmission medium in NR-U. The base station activates a quiet interval at a periodic interval and transmits on the medium based on the quiet interval. The base station may reduce a Tx power, not transmit, and/or may increase a minimum value of a contention window for BEB during the quiet interval. The base station may receive a request from a second base station to activate the quiet interval, and may determine if a Tx power of the base station is larger than the maximum Tx power of the second base station. The base station may also receive the request as relayed through a UE. The quiet interval can thus ameliorate a starvation effect of BEB in NR-U by allowing base stations with smaller Tx power greater opportunity to control the medium while maintaining BEB in NR-U.

Abstract: A surrounding information collection system requests a vehicle to transmit surrounding information, and stores the surrounding information transmitted from the vehicle in response to the request. The surrounding information collection system requests a vehicle to transmit surrounding information, the vehicle acquiring the surrounding information having accuracy greater than a threshold calculated based on accuracy of the stored surrounding information.

Abstract: A first communication device determines which one or more types of feedback information, from among a plurality of types of feedback information associated with a range measurement exchange session, a second communication device is to provide to the first communication device in a feedback packet transmitted as part of the range measurement exchange session. The first communication device transmits to the second communication device one or more indications of the determined one or more types of feedback information that the second communication device is to provide to the first communication device in the feedback packet. The first communication device performs the range measurement exchange, including receiving the feedback packet from the second communication device, wherein the feedback packet includes the determined one or more types of feedback information.

Abstract: The present disclosure relates to a communication technique for converging an IoT technology with a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, a security and safety related service, or the like) on the basis of a 5G communication technology and an IoT related technology.

Abstract: Methods, apparatuses, and computer-readable medium are described for doing fine timing measurements for one or more stations. A trigger frame is encoded for stations. Uplink null data packets are received. A time of arrival for the UP NDP and a time of departure for a downlink null data packet are determined. The time of arrival and time of departure are encoded into a data packet, such as a downlink null data packet announcement. A wireless device is configured to transmit the data packet to a station.

Abstract: Methods and apparatus for providing useful data in association with a high-priority call such as an emergency call. In one embodiment, the data comprises a data (e.g., an MSD or FSD) embedded within one or more real-time protocol packets such as RTP Control Protocol (RTCP) packets, that are interspersed within the voice or user data stream (carried in e.g., RTP packets) of an emergency call. Apparatus and methods are described for transmitting the data portion reliably from the initiating terminal (e.g., an in-vehicle system) to a Public Safety Answering Point (PSAP), by using the same transport connection as the user data.

Abstract: An apparatus and method define a parametric model that may be utilized for determining a position of a mobile device relative to a beacon that includes at least first and second directive antennas and at least a non-directive antenna. The apparatus includes a communication interface configured to receive signals from at least the first and second directive antennas and at least the non-directive antenna at each of a plurality of angular positions throughout a range of angles. The apparatus further includes processing circuitry configured to normalize the signal strengths of the signals received from the first and second directive antennas. The processing circuitry is also configured to determine the parametric model representative of relationships based upon the normalized signal strengths of the signals received from the first and second directive antennas to the angle of the mobile device to the beacon.

Abstract: An event is detected at a first device. Responsive to the detection, at least some functionality of the first device is deactivated. The presence of a second device, cryptographically paired with the first device, is detected by the first device. Responsive to the detection, at least some functionality of the first device is activated or reactivated.

Abstract: Disclosed are exemplary embodiments of systems and methods for use in authenticating consumers and/or computing devices to payment accounts. In an exemplary embodiment, a method generally includes generating, by a computing device, an authentication request for a consumer in response to a transaction by the consumer at a merchant. The transaction involves a payment account associated with the consumer, and the authentication request includes a direction to move a communication device associated with the consumer in a manner consistent with a reference movement. The method also includes receiving, by the computing device, an indication of movement of the communication device; comparing, by the computing device, the movement of the communication device to a reference movement; and then authenticating, by the computing device, the consumer to the payment account in connection with the transaction when the comparison indicates that the movement of the communication device matches the reference movement.

Abstract: Various implementations include approaches for controlling a wearable audio device. Particular approaches include: receiving data indicating the wearable audio device is proximate an additional wearable audio device worn by an additional user and running a personally attributed audio engine; and initiating personally attributed audio playback at the wearable audio device, where the personally attributed audio playback includes audio playback associated with the additional user.

Abstract: A system and method for detecting if a vehicle is being parked in a garage is disclosed. The method includes detecting sensory information at a vehicle and comparing the sensory information with ambient conditions outside of a garage to determine if the vehicle is likely in the garage or outside. The sensory information may also be compared to ambient conditions inside of a garage to determine if the vehicle is likely inside the garage or not. The method also includes sending reminders to vehicle owners who are not using their garage frequently. The method also includes automatically adjusting an insurance policy according the frequency of garage use.

Abstract: Techniques for pillar location for a mobile device are described, and may be implemented via a mobile device to identify frequently visited locations and to perform different tasks for the mobile device at the frequented locations. Generally, the described techniques enable a mobile device to generate precise representations of frequented locations known as “pillar locations” without relying on conventional location determination techniques. Further, specific actions can be performed when the mobile device is detected at a pillar location, such as automatically unlocking the mobile device from a locked state.

Abstract: A method of passive asset tracking includes associating unique identifying information of a Wi-Fi access point with a moveable asset, receiving unique identifying information and information relating to a location of the Wi-Fi access point encountered by one or more wireless devices and storing at least some of the information received, and tracking a location of the associated asset by the location of the Wi-Fi access point.

Abstract: An enhanced location based service for hybrid long term evolution (LTE) and/or Cellular Internet of Things (CIoT) network is disclosed. A method can comprise receiving, from a user equipment device, via a radio access technology, a first message representative of a request for measurement gap information for a location based service; determining a location of the user equipment device based on a serving cell location of a serving cell device that services the user equipment device; and transmitting, to the user equipment device, a second message comprising data representative of the measurement gap information.

Abstract: An access node transmits, in a downlink signal having a series of subframes, a beam-formed reference signal in subframes, where the beam-formed reference signals are transmitted in fewer than all of the subframes of the downlink signal. A first subset includes beam-formed reference signals corresponding to a first frequency or first localized range of frequencies, and a second subset includes beam-formed reference signals corresponding to a second frequency or second localized range of frequencies. The second frequency or second localized range of frequencies is spaced apart from and differing from the first frequency or first localized range of frequencies. A user equipment, UE, receives, in the downlink signal, the beam-formed reference signal in each of a plurality of subframes. The UE performs mobility management measurements using at least the first subset of the received beam-formed reference signals and performs RLM using the second subset of the received beam-formed reference signals.

Abstract: A radio station (1) transmits, to a radio terminal (3) on a licensed frequency (Cell #1), control signaling (S102) associated with at least one of a measurement timing and a measurement period of terminal measurement on an unlicensed frequency (Cell #2) and receives, from the radio terminal (3) on the licensed frequency (Cell #1), a result of the terminal measurement that is executed in response to the control signaling (S102) and in accordance with at least one of the measurement timing and the measurement period (S105). This contributes, for example, to acquisition of information useful for the radio station to determine whether to allow the radio terminal to perform communication on the unlicensed frequency.

Abstract: Various embodiments may include a method and/or arrangement for assigning the spatial position to a device, in particular in the context of the commissioning of the device (e.g. field device, actuator, sensor), wherein a positioning system is used to determine the spatial position of a mobile communication terminal located in the spatial vicinity of the device. The mobile communication terminal (e.g. smartphone) is configured to transmit the spatial position to the device and such that the transmission of the spatial position from the mobile communication terminal to the device only takes place when the device has been identified as an authorized receiver prior to transmission.

Abstract: A method for performing a handover process for a mobile radio network terminal in a mobile radio network. The method includes observing the transportation vehicle, predicting a travel route for the observed transportation vehicle, and informing the base station to which the transportation vehicle is logged on about the predicted travel route. A base station forwards the information about the predicted travel route to the base station of the cell to which the user equipment device in the observed transportation vehicle is logged on. This information is forwarded to a core network management component wherein an evaluation of the information about the predicted travel route takes place. The base station of the cell to which the observed transportation vehicle is travelling according to the predicted travel route is informed to prepare for taking over the user equipment from the passenger in the observed transportation vehicle in the handover process.

Abstract: Altitude determining circuitry for use in a User Equipment (UE) of a wireless communication network is provided. The circuitry comprises a receiver to receive at least one pressure parameter representative of a plurality of indoors pressure measurements from a respective plurality of indoors pressure measurement units located inside a building at different altitudes. The altitude determining circuitry also has processing circuitry to receive from a pressure sensor in the User Equipment a local pressure measurement at the UE and the processor determines an indoors altitude of the UE using the at least one pressure parameter and the UE local pressure. An integrated circuit for a Global Navigate Satellite System comprising the altitude determining circuitry and an indoors pressure measurement unit having a sensor for making a pressure measurement and a transmitter for transmitting the pressure measurement to the UE or to a further indoors pressure measurement unit are also provided.

Abstract: Systems, methods, and instrumentalities are disclosed for enforcing limited mobility in a mobile network. For example, a wireless transmit/receive unit (WTRU) may receive (e.g., receive from a network) a mapping of physical cell identifications (PCIs) to area identifications (AIDs). The WTRU may determine a first PCI associated with a first neighbor cell. The WTRU may determine, based on the first PCI and the PCIs to AIDs mapping, whether the WTRU is allowed to access the first neighbor cell. The WTRU may perform cell selection or reselection with the first neighbor cell as a cell selection or reselection candidate. The WTRU may perform cell selection or reselection based on the WTRU determining that the WTRU is allowed to access the first neighbor cell. The WTRU may determine that the WTRU is allowed to access the first neighbor cell based on the first PCI and the PCIs to AIDs mapping.

Abstract: A stochastic channel state information transmission/reception method and apparatus is provided for use in a multiuser radio communication system. The signal method of transmitting and receiving signals in a terminal in a mobile communication system according to the present disclosure includes receiving a reference signal transmitted by a base station, estimating channel information based on the reference signal, predicting a channel estimation error based on the channel information, generating feedback information based on the channel estimation error, and transmitting feedback information to the base station.

Abstract: A navigation device (300) transmits data indicative of an origin and destination of a desired route through a navigable network to a server. The server (310) generates a recommended route and provides data indicative of the route to a system (320) which provides a polyline representative of the route. The polyline is provided to the navigation device (300), which uses the polyline data to reconstruct the route. The navigation device (300) determines a least cost route through the network using the polyline data in order to reconstruct the route in respect to its own electronic map data. This is done by penalising segments depending upon their distance from the polyline, such that segments further from the polyline are less likely to be included in the route.

Abstract: An application program uninstallation method and apparatus relate to the field of communications technologies. The method includes: obtaining current location information of a terminal (101); obtaining effective location information of a first application that is already installed on the terminal, where the effective location information is used for instructing the first application to provide an effective application service when the terminal is within a geographical location range corresponding to the effective location information (102); and uninstalling, by the terminal, the first application when the current location information of the terminal does not match the effective location information of the first application (103).

Abstract: Disclosed are a mobile terminal having a display unit for outputting screen information and capable of enhancing a user's convenience related to the screen information, and a method for controlling the same. The mobile terminal includes: a touch screen configured to display screen information, and a controller configured to select a region of the touch screen based on first and second touch inputs when the first and second touch inputs applied to different points of the touch screen are maintained for a reference amount of time without being released, and configured to execute a function related to the selected region when a touch input corresponding to a preset condition is applied to the touch screen while the first and second touch inputs are maintained without being released.

Abstract: The present invention relates to the field of wireless communications technologies. In a receiving device, a receiving module receives a synchronization signal including a first signal and a second signal. The first signal includes N1 generalized ZC sequences, and the second signal includes N2 generalized ZC sequences. The second signal is used to distinguish different cells or different cell groups. There are at least two generalized ZC sequences with different root indexes in (N1+N2) generalized ZC sequences. A processing module performs a first sliding correlation operation and a second sliding correlation operation on the synchronization signal, and performs symbol timing synchronization according to a relationship between a sliding correlation peak generated when a sliding correlation is performed on the N1 generalized ZC sequences and a sliding correlation peak generated when a sliding correlation is performed on the N2 generalized ZC sequences.

Abstract: A fine timing measurement FTM method and a communications device are disclosed. The method includes: receiving an FTM request frame from at least two communications devices; and sending a first FTM measurement frame according to the FTM request frame, where the first FTM measurement frame includes a measurement parameter of each of the at least two communications devices and identifier information used to indicate each communications device, so that each communications device obtains the measurement parameter according to the identifier information.

Abstract: Systems and methods are disclosed for determining a navigational constraint for a portable device using an optical sensor. The navigational constraint may be used to supplement other navigational solutions or may be used independently. The optical sensor may capture a plurality of samples to be processed to determine the constraint. Determining the constraint may include any or all of determining a context for usage, distinguishing usage modes, estimating an orientation of the portable device, determining an absolute and/or relative elevation, determining a direction of motion and determining a speed of the portable device from the samples.

Abstract: An apparatus and method are disclosed for characterizing motion of a platform. Motion sensor data from a portable device having a sensor assembly may be obtained. The portable device may be within the platform and tethered or untethered, and the mobility of the portable device may be constrained or unconstrained within the platform. Following a determination the platform is moving, motion dynamics of the portable device that are independent from motion dynamics of the platform may be identified and motion sensor data corresponding to motion of the platform and motion sensor data corresponding to the identified independent motion of the portable device may be separated from the obtained motion sensor data. Accordingly, motion sensor data corresponding to motion of the platform that is independent of motion of the portable device may be output. This may be used to derive operator analytics for assessing performance.

Abstract: According to the present invention, a user device can obtain together, from an advertisement server for providing an advertisement service, via a neighbor access point device, update condition information on advertisement information in the course of obtaining the advertisement information. In addition, if the update condition information is satisfactory, the user device requests the advertisement information from the advertisement server via an AP and stores the advertisement information received in response to the request, thereby being capable of updating the advertisement information.

Abstract: A method is disclosed including determining an indicator information indicative of one or more indicators of a current usage of an electronic device, determining a condition information indicative of if the electronic device is rigidly positioned with respect to a user, wherein the condition information is determined based, at least in part, on the determined indicator information. It is further disclosed an according apparatus, computer program and system.

Abstract: A non-transitory computer readable recording medium stores therein a program that causes a computer to execute a process including: executing a process of acquiring a position of a terminal; determining whether there is object data registered in a position in an area corresponding to the acquired position by referring to a storage that stores positions in which multiple sets of object data are registered in association with the sets of object data, respectively; and displaying object data on a display when there is the object data registered in a position in the area, and curbing any one of frequency of executing the process of acquiring the position of the terminal and accuracy of the acquiring when there is no object data registered in a position in the area.

Abstract: Apparatus, systems, and methods for tracking the location of an individual during a fitness activity are disclosed. A method of tracking a participant engaged in a fitness activity includes determining a location of the participant during the fitness activity based on data received at a portable fitness device used by the participant; determining a location of a spectator during the fitness activity based on data received at a mobile spectator device used by the spectator; from a server, sending an alert to a spectator at a spectator device during the fitness activity indicating that the participant is within a predetermined distance of the spectator; and sending an alert to the portable fitness device during the fitness activity indicating that the spectator is within a predetermined distance of the participant.

Abstract: Methods and apparatus for determining an altitude for a terminal device operating in a wireless telecommunications network including the terminal device and another network entity. The terminal device measures an indication of barometric pressure in its vicinity using a barometric sensor. The other network entity establishes calibration information, for the barometric pressure measurement, including a reference barometric pressure for a reference altitude and may come from a barometric pressure measurement at the other network entity or from meteorological data provided to the other network entity. The altitude relative to the reference altitude may then be determined from the difference between the barometric pressure measured by the terminal device and the reference barometric pressure, by the terminal device after receiving the calibration information from the other network entity and/or by the other network entity after receiving an indication of the barometric pressure measured by the terminal device.

Abstract: Various techniques are provided to efficiently detect the position and angular velocity of an unmanned aerial vehicle (UAV) of a UAV system including a transmitter antenna array and a receiver antenna array. In one example, a method includes establishing a wireless link between a UAV controller and a UAV using at least one transmitter antenna array and/or at least one receiver antenna array, communicating link state data corresponding to the established wireless link over the established wireless link, generating UAV operational data based, at least in part, on the link state data, wherein the UAV operational data is configured to control operation of the UAV, and controlling operation of the UAV using the UAV operational data.

Abstract: According to certain embodiments, disclosed is a method performed by a master node, MN, (160A) for measurement gap configuration. The method may include operating in a dual connectivity, DC, configuration with a secondary node, SN, (160B) and a wireless device (110). The method may further include configuring the wireless device (110) with a measurement gap configuration, wherein the measurement gap configuration allows the wireless device (110) to measure a first frequency range, FR1, and a second frequency range, FR2.

Abstract: A system and method for tracking and alerting a drone flying overhead are provided herein. The method includes acquiring a first data associated with a user device position; detecting a path corresponding to movement of the user device; receiving, from a server at the user device, drone data associated with a plurality of drones; filtering the drone data to obtain a second data associated with a drone position and a respective drone route which intersects with the path; predicting an intersection area; determining a distance between the user device position and the drone position based on the first data and the second data; determining whether a determined distance is equal to or less than a preset distance; and instructing a user to change the path or the speed of travel down a path when the determined distance is equal to or less than the preset distance.

Abstract: Disclosed are a system and method of regulating mobile device communications while operating a motor vehicle. One example method may include determining a speed event indicating that a speed of the motor vehicle has performed at least one of exceeded a first threshold above which mobile device usage restriction policies are invoked and fallen below a second threshold allowing the mobile device restriction policies to be removed. The first threshold may be equal to or greater than the second threshold. As a result of obtaining the speed event, the method may also provide transmitting the speed event to a remote edge gateway server located remotely from the motor vehicle, which stores the speed event for reference purposes when determining a policy for routing a particular mobile device call, text message and/or mobile data session.

Abstract: An example beaconing method includes establishing a location via real-time geolocation of a mobile device at a remote location. The beaconing method also includes generating a non-derivative transmission-location code for the location that does not rely on any actual GPS or address information to establish makeup of the transmission-location code. The beaconing method also includes associating data of at least one of: destination, event time, and real-time tracking data with the transmission-location code. The beaconing method also includes conveying the transmission-location code to one or more user. The beaconing method also includes allowing the one or more user to enter the conveyed transmission-location code. The beaconing method also includes displaying data associated with the transmission-location code, the data including at least one of destination, event time, and real-time tracking and/or location data, in response to receiving the transmission-location code.

Abstract: A system for localizing user devices includes an unmanned aerial vehicle (UAV). The UAV includes a transceiver configured to establish a communicative connection with a user device, and retrieve information pertaining to the user device at each of a plurality of different points in time. The UAV further includes a satellite-localization system configured to ascertain a geographic location of the UAV at each of the plurality of different points in time, and a processor. The processor is configured to, based on the information pertaining to the user device retrieved at each of the plurality of different points in time and on the geographic location of the UAV at each of the plurality of different points in time, determine a location of the user device.

Abstract: According to a first aspect of the present disclosure, a method of configuring a mobile device is conceived, comprising: determining a geographical location of said mobile device; retrieving one or more near field communication settings specific to the geographical location; applying and storing the near field communication settings to the mobile device. According to a second aspect of the present disclosure, a corresponding computer program is provided. According to a third aspect of the present disclosure, a corresponding system for configuring a mobile device is provided.

Abstract: A method of estimating a location of an interference signal source includes using a first antenna configured to receive a signal from the interference signal source and using a second antenna arranged proximate to the first antenna and configured to receive global positioning system (GPS) signals. An initial trend in variation in power of a received signal from the interference signal source is determined relative to a position of the second antenna, wherein upon determining the initial trend, the initial trend is a current trend. In an iterative manner, the second antenna is directed to be repositioned. A secondary area associated with a lack of power measurement outside of an area traveled is identified and a further repositioning of the second antenna is determined to reduce the secondary area. An estimate of the location of the interference signal source is then determined.

Abstract: A mobile device having location services may store information pertaining to a geo-fence that is associated with a user of the mobile device and assigned to a location. The mobile device may identify a current location of the mobile device and store data pertaining to the location of the mobile device. The mobile device determines a current geo-fence state of the mobile device based on the location data in response to an internal stimuli or an external stimuli. The geo-fence state is selected from at least an inside geo-fence state in which the mobile device is deemed to be inside the geo-fence and an outside geo-fence state in which the mobile device is deemed to be outside of the geo-fence. The mobile device may notify a remote server of the current geo-fence state.

Abstract: A location engine that estimates the barometric pressure measurement bias of a pressure station reference, such as an airport pressure station, resulting in an improved estimate of the elevation of a wireless terminal. The location engine generates the estimate of bias of barometric pressure by comparing i) the outdoor barometric pressure measured by the airport pressure station at its unknown height above mean sea level (MSL) and ii) the expected outdoor barometric pressure derived from the pressure measurements from an already-calibrated pressure station, while accounting for the known height of the already-calibrated pressure station. The expected outdoor measurements correspond to a derived height above MSL of the airport pressure station. Subsequently, the location engine generates an estimate of the elevation of the wireless terminal by accounting for the estimate of measurement bias of the airport pressure station.

Abstract: A mobile transceiver having selectable travel modes and a method of operation are provided. In accordance with one embodiment, there is provided a method of operating a mobile transceiver having a processor, and a wireless transceiver and a satellite receiver each coupled to the processor, the method comprising: sending a message to an asset tracking service, the message from a mobile transceiver including a device identifier (ID) associated with the mobile transceiver; receiving a message from the asset tracking service, the message including an instruction for the mobile transceiver to apply a selected travel mode; and applying the selected travel mode as a current travel mode.

Abstract: A method of location of a device includes a displacement law containing a corrective factor of a bias combined by an arithmetical operation with a measured variable, and particles, each particle being associated with a current value of the corrective factor. The current value of the corrective factor being constructed at each iteration on the basis of a previous current value of the corrective factor, computed during a previous iteration, to which is added a random variable drawn according to a predefined probability law. The current values of various particles are initialized, before the first iteration, to various initial values, and during each iteration, for each particle whose coordinates are updated with the aid of this displacement law, the value of the corrective factor in the displacement law is taken equal to this corrective factor's current value associated with the particle.

Abstract: There are provided systems and methods for wireless beacon devices for use in tracking user locations during group travel. A user may take a trip on a vehicle, such as a bus, train, cruise ship, or other large travel vehicle. The users may disembark the vehicle in order to visit a location but plan to travel further on the vehicle. Thus, when the vehicle is attempting to leave the location where the users have left the vehicle, the vehicle may be required to again account for each passenger. The vehicle may utilize a wireless beacon located near an entrance and/or onboard the vehicle to account for each passenger. The wireless beacon may connect to a communication device of each user when the communication device is in proximity to the wireless beacon and, thus, inform the vehicle's operator that each user in located on the vehicle.

Abstract: An event is detected at a first device. Responsive to the detection, at least some functionality of the first device is deactivated. The presence of a second device, cryptographically paired with the first device, is detected by the first device. Responsive to the detection, at least some functionality of the first device is activated or reactivated.

Abstract: The present disclosure involves systems, software, and computer implemented methods for identifying locations associated with particular users in response to requests from a visitor or fellow user. One example system includes a communications module, a plurality of sensors located in a defined area configured to at least partially determine locations of at least one person, and a location database including location information received from the sensors associating particular persons with particular locations associated with particular sensors. A request for a location associated with a particular person is received from a first device. A current location associated with one of the plurality of sensors is determined from the location database, wherein the current location is also associated with the particular person. A response to request is generated including the current location and is transmitted to the first device.