The present invention relates to a method for indicating the validity of a channel configuration. Configuration information for establishing the reception of a physical channel carrying point-to-multipoint services is sent via a point-to-multipoint control channel to a mobile terminal. Validity information is sent together with the configuration information for indicating to the mobile terminal when or how long the configuration information is valid. The configuration information may be valid during a current modification period, after a given activation time, or up to a given activation time. Thus, a mobile terminal can avoid using an invalid physical channel configuration.