Positioning performance

An apparatus comprising at least one processor and at least one memory, wherein the at least one memory includes computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause a device at least to:

• obtain test data collected on a test track at a particular site, the test data comprising a plurality of radio samples and for each radio sample an indication of a reference location, each radio sample including at least one characteristic of at least one radio signal transmitted by at least one beacon and measured by a mobile device at the indicated reference location and an identification of the at least one beacon;
• estimate for each of a plurality of representations of a radio environment for the particular site positions on the test track based on the plurality of radio samples of the test data and on the respective representation of the radio environment, wherein each of the plurality of representations of the radio environment has been generated based on a different selection of a plurality of batches of fmgerprints, wherein each fmgerprint comprises a radio sample and for each radio sample an indication of a location of measurement, and wherein each radio sample of a fmgerprint includes at least one characteristic of at least one radio signal transmitted by at least one beacon and measured by a mobile device at the indicated location of measurement and an identification of the at least one beacon;
• determine for each of the plurality of representations of the radio environment a positioning performance by comparing the positions estimated for the respective representation of the radio environment with the reference locations;
• and
• determine, based on the determined positioning performances, whether one or more of the plurality of batches of fmgerprints are to be excluded as a basis for a generation of representations of the radio environment for positioning purposes and/or select a representation of the radio environment resulting in a best positioning performance as a currently valid representation of the radio environment for the particular site.

A computer readable storage medium in which computer program code is stored, the computer program code causing a device to perform the following when executed by a processor:

• obtain test data collected on a test track at a particular site, the test data comprising a plurality of radio samples and for each radio sample an indication of a reference location, each radio sample including at least one characteristic of at least one radio signal transmitted by at least one beacon and measured by a mobile device at the indicated reference location and an identification of the at least one beacon;
• estimate for each of a plurality of representations of a radio environment for the particular site positions on the test track based on the plurality of radio samples of the test data and on the respective representation of the radio environment, wherein each of the plurality of representations of the radio environment has been generated based on a different selection of a plurality of batches of fmgerprints, wherein each fmgerprint comprises a radio sample and for each radio sample an indication of a location of measurement, and wherein each radio sample of a fmgerprint includes at least one characteristic of at least one radio signal transmitted by at least one beacon and measured by a mobile device at the indicated location of measurement and an identification of the at least one beacon;
• determine for each of the plurality of representations of the radio environment a positioning performance by comparing the positions estimated for the respective representation of the radio environment with the reference locations;
• and
• determine, based on the determined positioning performances, whether one or more of the plurality of batches of fmgerprints are to be excluded as a basis for a generation of representations of the radio environment for positioning purposes and/or select a representation of the radio environment resulting in a best positioning performance as a currently valid representation of the radio environment for the particular site.

An apparatus comprising at least one processor and at least one memory, wherein the at least one memory includes computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause a mobile device at least to:

• enter a survey mode or a test mode;
• determine locations of the mobile device;
• perform measurements on radio signals at each of the determined locations to obtain radio samples, each radio sample including at least one characteristic of at least one radio signal transmitted by at least one beacon and measured at the indicated location and an identification of the at least one beacon;
• assemble, in a survey mode, a batch of fmgerprints, wherein each fmgerprint comprises a radio sample collected during a survey of a particular site and for each radio sample an indication of a determined location as a location of measurement, and transmit the batch of fmgerprints to a server as a basis for generating a representation of a radio environment at the site;
• and
• assemble, in a test mode, test data, wherein the test data comprises radio samples collected on a test track and for each radio sample an indication of a determined location as a reference location, and transmit the test data to a server as a basis for enabling the server to determine which batches of fmgerprints of a plurality of batches of fmgerprints provided by at least one mobile device are to be used in the generation of the representation of the radio environment at the site.