A method implemented by a base station (40-s) configured to serve a wireless device in a serving cell (42-s) of a wireless communication system on a serving frequency (f s), the method comprises: obtaining information that indicates one or more non-serving frequencies (f 1, f 2) on which the wireless device is to perform one or more positioning measurements that are to be used for determining the wireless device's geographic position; and for at least one non-serving frequency (f 1, f 2) indicated by the information, configuring a measurement gap during which the wireless device is to perform a corresponding positioning measurement to occur during a period of time in which a neighboring cell (42-1, 42-2) transmits a positioning reference signal (46-1, 46-2) over that non-serving frequency (f 1, f 2), and characterized in that: said obtaining comprises receiving at least some of the information within a request from the wireless device requesting that the base station (40-s) configures one or more measurement gaps during which the wireless device is to perform the one or more positioning measurements on the one or more non-serving frequencies (f 1, f 2). implemented by a base station (40-s) configured to serve a wireless device in a serving cell (42-s) of a wireless communication system on a serving frequency (f s), the method comprises: obtaining information that indicates one or more non-serving frequencies (f 1, f 2) on which the wireless device is to perform one or more positioning measurements that are to be used for determining the wireless device's geographic position; and for at least one non-serving frequency (f 1, f 2) indicated by the information, configuring a measurement gap during which the wireless device is to perform a corresponding positioning measurement to occur during a period of time in which a neighboring cell (42-1, 42-2) transmits a positioning reference signal (46-1, 46-2) over that non-serving frequency (f 1, f 2), and characterized in that: said obtaining comprises receiving at least some of the information within a request from the wireless device requesting that the base station (40-s) configures one or more measurement gaps during which the wireless device is to perform the one or more positioning measurements on the one or more non-serving frequencies (f 1, f 2). obtaining information that indicates one or more non-serving frequencies (f 1, f 2) on which the wireless device is to perform one or more positioning measurements that are to be used for determining the wireless device's geographic position; and for at least one non-serving frequency (f 1, f 2) indicated by the information, configuring a measurement gap during which the wireless device is to perform a corresponding positioning measurement to occur during a period of time in which a neighboring cell (42-1, 42-2) transmits a positioning reference signal (46-1, 46-2) over that non-serving frequency (f 1, f 2), and characterized in that: said obtaining comprises receiving at least some of the information within a request from the wireless device requesting that the base station (40-s) configures one or more measurement gaps during which the wireless device is to perform the one or more positioning measurements on the one or more non-serving frequencies (f 1, f 2).