Techniques describe tagging visual data (e.g., image and/or video data) with wireless and sensor measurement information by a mobile device. Tagged visual data may be sent to a server, such as a crowdsourcing server. Techniques further describe receiving visual data from a device, wherein the visual data is tagged with information comprising source identifying information associated with an at least one signal emitting device, identifying at least one visual feature from the visual data, determining a coordinate on a map at which the visual data was acquired based on identifying the at least one visual feature from the visual data, and associating the coordinate on the map with the information associated with the at least one signal emitting device.

A method for assisting in position determination in a wireless communication system comprises obtaining (S1) of pairs of radio frequency environment data sets for each of a plurality of common positions. A pair of radio frequency environment data sets comprises radio frequency environment data of devices of a first access technology and a second access technology at a common position. A transformation operator is created (S2) based on the pairs. The transformation operator represents a relation between radio frequency environment data sets of the first and second access technology. A method for position determination in a wireless communication system based on transformation operator and network nodes therefore is also disclosed, as well as network nodes for performing the methods.

In a mobile positioning system, mobile user devices carry out data validation on locally stored positioning data, regulating the positioning data provided to a positioning module and selectively requesting updated positioning data from a central database. A controller receives requests for updated positioning data and selectively responds with updates. The mobile user devices store observations data concerning measurements of signals from electromagnetic signal sources and transmit data about the locally stored observations data to the controller. The controller then selectively requests transmission of the locally stored observations data and the mobile user device determines when and whether to transmit that data. The amount of positioning data which must be transmitted to and from the mobile user device and the overall power consumption of the mobile user device is reduced. The decision as to what observations data to transmit to the controller is distributed between the mobile user device and the controller.

The present invention relates to a method of measuring the position of a terminal by using a heterogeneous network signal. The method comprises receiving transmission time information that represents a time at which a signal for measuring the position of a terminal is transmitted; receiving a first signal from a reference cell at a time represented by the transmission time information; receiving a second signal from a measurement cell at a time represented by the transmission time information; calculating the difference between the time at which the first signal is received and the time at which the second signal is received to generate measurement information; and reporting the measurement information.

Example methods, apparatuses, and/or articles of manufacture are disclosed herein that may be utilized, in whole or in part, to facilitate and/or support one or more operations and/or techniques for selective crowdsourcing for multi-level positioning, such as positioning in a multi-level structure, for example.

As at least part of a location network, there is provided a trigger node and multiple listening nodes. The trigger node wirelessly transmits a trigger signal to the mobile device, the trigger signal being configured to cause the mobile device to wirelessly emit a signal in response to receiving the trigger signal. The listening nodes listen for the response signal that was transmitted from the mobile device in response to the trigger signal, and thereby at each respective one of a plurality of the listening nodes that wirelessly receive the response signal from the mobile device, a respective measurement is taken of the response signal as received at the respective listening node, for use in performing a localization to determine the location of the mobile device based on one or more of these measurements.

A system and method for generating radio tomographic images is provided. A plurality of transceivers positioned around a region to be imaged is divided into a plurality of pixels. A control apparatus is configured to cause each of the plurality of transceivers in turn to send a signal to each of the other transceivers. The control apparatus is further configured to determine an attenuation in the received signals, generate weighing, derivative, and attenuation matrices from the signals, group the pixels into a plurality of provinces, select each province in turn and solve for a change in attenuation in each of the pixels while setting the pixels in other provinces to zero, aggregate solutions from each of the provinces into a rough estimate, re-solve each province using the aggregated rough estimate, aggregate the re-solved solutions from each province into a refined estimate, and generate an image from the refined estimate.

An apparatus receives a message including results of measurements on signals of a WLAN access point. The apparatus determines as a first condition whether the message comprises no indication of a position obtained in a non-cell based positioning and/or no information enabling a non-cell based positioning. The apparatus determines as a second condition whether the message comprises in addition results of measurements on signals of at least one cell of a cellular communications network. If the conditions are met, the apparatus determines a position based on the results of measurements on signals of the at least one cell of a cellular communications network and causes storage of location information that is based on the determined position in a memory for the WLAN access point, in case no location information has previously been stored in the memory for the WLAN access point.

A system and method to determine a location of a device in a wireless local area network (LAN) based on positioning assistance data acquired from a server is disclosed. The host-offload wireless LAN device may determine a location based on the location computations done inside the wireless LAN module. The device includes a storage medium configured to provide a database of positioning assistance data, a wireless LAN module configured to receive beacon signals broadcast from one or more access points, and a processor configured to store the access point identification information and the signal strength detected by the wireless LAN module in a first memory section, access the previously-stored positioning assistance data from the storage medium, assemble positioning assistance data based on a comparison, store the assembled positioning assistance data in a second memory section, and determine a location of wireless LAN device using assembled positioning assistance data.

A technique is provided for localizing a plurality of wireless transmitters. The technique includes retrieving Received Signal Strength Indicator (RSSI) values measured by one or more sensors, corresponding to the plurality of wireless transmitters distributed in a region in which the sensors are located. The technique further comprises generating, a plurality of clusters based on the retrieved RSSI values. The technique further comprises generating a binary image based on the generated clusters. The binary image comprises one or more white regions and one or more black regions. The technique further comprises localizing position of each of the plurality of wireless transmitters, based on a determination of contours of the one or more white regions present in the binary image.