Methods, architectures, apparatuses and systems for data multi-connectivity in energy saving networks

A method, implemented by a wireless transmit/receive unit (WTRU), the method comprising:

• receiving configuration information indicating (1) a first cell group and a second cell group and (2) one or more data flows, wherein at least one of the first cell group and the second cell group are capable of applying network energy saving techniques, and wherein the data flows are associated with radio resources of one of the first cell group and the second cell group;
• based at least on a network energy saving state being activated on the first cell group, routing a data flow associated with the radio resources of the first cell group to the second cell group that is not in the network energy saving state;
• applying a protocol chain configuration associated with the second cell group for uplink data transmission;
• and
• transmitting the uplink data or control information on the second cell group.

A wireless transmit/receive unit (WTRU), comprising:

• circuitry, including any of a processor, memory, transmitter and receiver, the circuitry configured to
• receive configuration information indicating (1) at least two cell groups and (2) one or more data flows for which data can be routed on one or more the at least two cell groups, wherein one or more of the at least two cell groups are capable of applying network energy savings;
• and
• based at least on a network energy saving state being activated on one of the at least two cell groups, route a data flow associated with the one of the at least two cell groups to another one of the at least two cell groups, wherein the another one of the at least two cell groups is not in the network energy saving state.