Abstract: A method, in a base station, provide a mechanism for observing random access performance in a Long Term Evolution network. The random access performance is defined by an access delay. The access delay is a delay from the initial random access attempt until access is granted. The method comprises receiving a respective report from a plurality of user equipment, where each of the respective user equipment has performed a random access process and received a random access grant. The reactive report includes access delay related random access information. The method includes determining a respective access delay, based on each of the access delay related random access information. The determined access delays are used for the estimation of access delay statistics. The random access performance is observed based on the access delay statistics.

Abstract: An object of the present invention is to provide a mechanism for observing random access performance in a Long Term Evolution network. The object is achieved by a method in a base station (110). The method observes a random access performance in a Long Term Evolution communication network. The random access performance is defined by an access delay, where the access delay is a delay from the initial random access attempt until access is granted. The method comprises receiving a respective report from a plural of user equipments (115), where each of the respective user equipment (115) has performed a random access process and has received a random access grant. Respective report will comprise access delay related random access information. Further the method comprises determining a respective access delay, which is based on each of the access delay related random access information. The determined access delays will be the basis for the estimation of access delay statistics.

Abstract: A power converter circuit includes output terminals, and a plurality of converter units each comprising input terminals configured to be coupled to a DC power source, and output terminals for providing an AC output voltage and an AC output current. The plurality of converter units are connected in series between the output terminals of the power converter circuit. At least one of the converter units is configured to detect its AC output voltage and its AC output current and is configured to regulate a generation of the AC output current such that a phase difference between the AC output voltage and the AC output current corresponds to a given set value.