RESTRICTED ACCESS IN CELLULAR COMMUNICATION SYSTEMS

摘要

A cellular communication system comprises a base station (101) which can operate in a restricted mode wherein support is restricted to user equipments (105, 107) of a first associated set of user equipments, such as a Closed Subscriber Group. The base station comprises a profile unit (207) which determines a first transmit power profile where the first transmit power profile is indicative of the base station operating in the restricted mode. The base station further comprises a transmitter (201) for transmitting at least one common channel, such as a pilot signal or a broadcast signal, with a transmit power according to the first transmit power profile. User Equipments may measure the power profile to evaluate whether the base station employs restricted access. The number of access attempts to restricted base stations by non- eligible User Equipments may be reduced.