System enhancements for using power saving

A wireless transmit/receive unit (WTRU) comprising:

• a transceiver;
• and
• a processor, wherein:
• the transceiver and the processor are configured to receive at least three sets of parameters associated with power saving, wherein a first set of the parameters is associated with an idle state and wherein the first set of the parameters is associated with a first type of network entity, wherein a second set of the parameters is associated with a connected state, wherein a third set of the parameters is associated with the WTRU not being in a connected state and remaining registered with a network and maintaining a packet data network (PDN) connection and wherein the third set of the parameters is associated with a second type of network entity, and wherein the first type of network entity is different than the second type of network entity;
• and
• the transceiver and the processor are further configured to, on a condition that the WTRU is not in the connected state and remains registered with the network, enter active times based on the third set of the parameters, wherein the transceiver and the processor are further configured to, during the active times, monitor physical downlink control channels (PDCCHs) for paging messages.