Methods and apparatuses for layer 1/layer 2 triggered mobility (ltm) use and radio resource control (rrc) messaging

A wireless transmit/receive unit (WTRU) comprising:

• a processor and a transceiver which are configured to:
• receive information indicating a configuration of a layer 3 (L3) measurement event and/or reporting,
• receive information indicating a layer 1/layer 2 (L1/L2) triggered mobility (LTM) configuration,
• receive information indicating a condition for inclusion of primary cell (PCell) information in L3 measurement reporting,
• perform measurements on a serving cell and a candidate cell,
• send a L1/L2 measurement report based on the measurements, wherein the L1/L2 measurement report includes information indicating that (i) a measurement result of the candidate cell is higher than (ii) a measurement result of the serving cell plus an offset,
• after sending the L1/L2 measurement report, start a transmission of a L3 measurement report based on triggering of the L3 measurement event, wherein the layer 3 measurement report includes information indicating an identifier of the PCell of the WTRU associated with the triggering of the L3 measurement event,
• receive a LTM cell switch command,
• reconfigure to another cell based on the LTM cell switch command, and complete the transmission of the L3 measurement report.

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

• receiving information indicating a configuration of a layer 3 (L3) measurement event and/or reporting;
• receiving information indicating a layer 1/layer 2 (L1/L2) triggered mobility (LTM) configuration;
• receiving information indicating a condition for inclusion of primary cell (PCell) information in L3 measurement reporting;
• performing measurements on a serving cell and a candidate cell;
• sending a L1/L2 measurement report based on the measurements, wherein the L1/L2 measurement report includes information indicating that (i) a measurement result of the candidate cell is higher than (ii) a measurement result of the serving cell plus an offset;
• after sending the L1/L2 measurement report, starting a transmission of a L3 measurement report based on triggering of the L3 measurement event, wherein the layer 3 measurement report includes information indicating an identifier of the PCell of the WTRU associated with the triggering of the L3 measurement event;
• receiving a LTM cell switch command;
• reconfiguring to another cell based on the LTM cell switch command;
• and
• completing the transmission of the L3 measurement report.