Abstract: According to an example embodiment, there is provided a base station apparatus configured to store an initial planned location of the apparatus, to receive first messages from a master base station, each first message comprising a first timestamp indicating a transmission time of the first message, and to transmit second messages, each second message comprising a second timestamp indicating a transmission time of the second message and a location estimate of the apparatus, to receive second messages from peer apparatuses, and to receive third messages from the master base station, and configured to to determine a location of the apparatus by performing an iterative process, wherein each iteration comprises determining an updated location estimate of the apparatus based on a received first message, received at least one second message and a received third message, and determining a quality criterion of the updated location estimate of the apparatus.

Abstract: According to an example aspect of the present invention, there is provided a method comprising obtaining a first length of time, a second length of time, a third length of time, a fourth length of time and a fifth length of time, and determining a time difference of arrival of a signal from a wireless tag between the first and second non-master base stations based on the determined lengths of time.

Abstract: An electronic label apparatus comprises: an inductive communication unit which communicates wirelessly using inductive signals; a processor; memory including a computer program code; and a power source which supplies electric power to the inductive communication unit, the processor, and the memory for enabling their operation. The processor, the memory, the computer program code and the power source with the electric power cause the electronic label apparatus at least to: receive a plurality of inductive signals of known transmission powers from known locations; measure signal powers of the received inductive signals; and determine information about a location of the electronic label apparatus based on the measured signal powers, the known transmission signal powers and the known locations.

Abstract: According to an example aspect of the present invention, there is provided an apparatus comprising a receiver configured to receive at least the following wireless messages: an initial message from a master base station, at least one response message from each of at least two non-master base stations and a data message from the master base station, and at least one processing core configured to determine, based on the received wireless messages, for the master base station and each non-master base station, a time difference of arrival from the apparatus, and based at least partly on the determined time difference of arrival, a location of the apparatus.

Abstract: An electronic label apparatus comprises: an inductive communication unit which communicates wirelessly using inductive signals; a processor; memory including a computer program code; and a power source which supplies electric power to the inductive communication unit, the processor, and the memory for enabling their operation. The processor, the memory, the computer program code and the power source with the electric power cause the electronic label apparatus at least to: receive a plurality of inductive signals of known transmission powers from known locations; measure signal powers of the received inductive signals; and determine information about a location of the electronic label apparatus based on the measured signal powers, the known transmission signal powers and the known locations.

Abstract: According to an example aspect of the present invention, there is provided an apparatus comprising a receiver configured to receive at least the following wireless messages: an initial message from a master base station, at least one response message from each of at least two non-master base stations and a data message from the master base station, and at least one processing core configured to determine, based on the received wireless messages, for the master base station and each non-master base station, a time difference of arrival from the apparatus, and based at least partly on the determined time difference of arrival, a location of the apparatus.