A method of measurement in a wireless communication system, comprising: operating a wireless device on a first wireless communication technology; detecting a first cell in first frequency of a second wireless communication technology, wherein the second wireless communication technology is preferred relative to the first wireless communication technology; determining the detected cell of the second wireless communication technology satisfies a first reselection criterion based on a first measurement; characterised by: identifying a second frequency of the second wireless communication technology as an undetected frequency based on monitoring the second frequency without detecting a second cell; expediting a determination of whether to perform cell reselection to the second wireless communication technology based on the undetected frequency and the detected cell of the second wireless communication technology satisfying the first reselection criterion, wherein the expediting the determination of whether to perform cell reselection comprises increasing a frequency of measuring the detected cell; and determining to reselect to the detected cell of the second wireless communication technology when at least one new measurement satisfies a second reselection criterion. operating a wireless device on a first wireless communication technology; detecting a first cell in first frequency of a second wireless communication technology, wherein the second wireless communication technology is preferred relative to the first wireless communication technology; determining the detected cell of the second wireless communication technology satisfies a first reselection criterion based on a first measurement; characterised by: identifying a second frequency of the second wireless communication technology as an undetected frequency based on monitoring the second frequency without detecting a second cell; expediting a determination of whether to perform cell reselection to the second wireless communication technology based on the undetected frequency and the detected cell of the second wireless communication technology satisfying the first reselection criterion, wherein the expediting the determination of whether to perform cell reselection comprises increasing a frequency of measuring the detected cell; and determining to reselect to the detected cell of the second wireless communication technology when at least one new measurement satisfies a second reselection criterion. identifying a second frequency of the second wireless communication technology as an undetected frequency based on monitoring the second frequency without detecting a second cell; expediting a determination of whether to perform cell reselection to the second wireless communication technology based on the undetected frequency and the detected cell of the second wireless communication technology satisfying the first reselection criterion, wherein the expediting the determination of whether to perform cell reselection comprises increasing a frequency of measuring the detected cell; and determining to reselect to the detected cell of the second wireless communication technology when at least one new measurement satisfies a second reselection criterion.