A method of managing discontinuous reception, DRX, in a wireless communication system which includes a plurality of wireless transmit/receive units, WTRUs, and a network, comprising the steps of: pre-configuring the plurality of WTRUs so that N WTRUs are identified to be in a specific paging group; at least one WTRU in the specific paging group sending an apply request associated with scheduled monitoring to the network; characterized in that: the network deciding a DRX setting for the specific paging group according to an amount of apply requests received from the specific paging group and a paging cycle of the network; and the N WTRUs in the specific paging group taking turns in monitoring on a paging channel based on the DRX setting, wherein: the DRX setting includes a monitoring cycle and a start offset of each WTRU in the specific paging group; the monitoring cycle of each WTRU in the specific paging group is longer than the paging cycle of the network; the start offset of each WTRU in the specific paging group indicate a start point of a corresponding monitoring cycle of each WTRU in the specific paging group; at a given point of time when network signaling arrives according to the paging cycle of the network, A WTRUs among the N WTRUs in the specific paging group are configured to turn on for monitoring the paging channel and B WTRUs among the N WTRUs in the specific paging group are configured to turn off; A and B are positive integers; N is equal to a sum of A and B; and A is smaller than N. pre-configuring the plurality of WTRUs so that N WTRUs are identified to be in a specific paging group; at least one WTRU in the specific paging group sending an apply request associated with scheduled monitoring to the network; the network deciding a DRX setting for the specific paging group according to an amount of apply requests received from the specific paging group and a paging cycle of the network; and the N WTRUs in the specific paging group taking turns in monitoring on a paging channel based on the DRX setting, wherein: the DRX setting includes a monitoring cycle and a start offset of each WTRU in the specific paging group; the monitoring cycle of each WTRU in the specific paging group is longer than the paging cycle of the network; the start offset of each WTRU in the specific paging group indicate a start point of a corresponding monitoring cycle of each WTRU in the specific paging group; at a given point of time when network signaling arrives according to the paging cycle of the network, A WTRUs among the N WTRUs in the specific paging group are configured to turn on for monitoring the paging channel and B WTRUs among the N WTRUs in the specific paging group are configured to turn off; A and B are positive integers; N is equal to a sum of A and B; and A is smaller than N. the DRX setting includes a monitoring cycle and a start offset of each WTRU in the specific paging group; the monitoring cycle of each WTRU in the specific paging group is longer than the paging cycle of the network; the start offset of each WTRU in the specific paging group indicate a start point of a corresponding monitoring cycle of each WTRU in the specific paging group; at a given point of time when network signaling arrives according to the paging cycle of the network, A WTRUs among the N WTRUs in the specific paging group are configured to turn on for monitoring the paging channel and B WTRUs among the N WTRUs in the specific paging group are configured to turn off; A and B are positive integers; N is equal to a sum of A and B; and A is smaller than N.