Abstract: A location system includes a mobile wireless device and a wireless receiver. The wireless receiver is configured to receive wireless transmissions from the mobile wireless device and to transmit bursts of device reports concerning the wireless transmissions to a report processor. The report processor is configured to receive the bursts of device reports from the wireless receiver, each burst being received by the report processor during a respective burst reception time window. The report processor may vary the duration of the burst reception time window during use, in dependence at least upon: (i) a determination of a type of burst of device reports; and/or (ii) a measured duration of a previous burst of device reports.