Methods and apparatus for inter-cell multi trp operation in wireless communication systems

A method implemented in a wireless transmitter/receiver unit (WTRU) the method comprising:

• receiving, from a network node, a first message comprising configuration information for a serving cell, wherein the configuration information indicates a plurality of timing advance groups (TAGs) and a plurality of transmission configuration indication (TCI) states, and wherein each TCI state is associated with a timing advance group (TAG) of the plurality of TAGs;
• transmitting, to the network node, a preamble on a physical random access channel transmission;
• in response to transmitting the preamble, receiving, from the network node, a random access response message comprising information indicating a timing advance (TA) value and a TAG identity associated with a first TAG of the plurality of TAGs;
• receiving, from the network node, a physical downlink control channel (PDCCH) indicating information comprising a TCI state identity associated with a first TCI state of the plurality of TCI states;
• and
• transmitting an uplink (UL) transmission, wherein a timing of the UL transmission is adjusted based on the received TA value when the first TCI state of the plurality of TCI states is associated with the first TAG.

A wireless transmit/receive unit (WTRU) comprising a processor, a transceiver unit and a storage unit, and configured to:

• receive, from a network node, a first message comprising configuration information for a serving cell, wherein the configuration information indicates a plurality of timing advance groups (TAGs) and a plurality of transmission configuration indication (TCI) states, and wherein each TCI state is associated with a timing advance group (TAG) of the plurality of TAGs;
• transmit, to the network node, a preamble on a physical random access channel transmission;
• in response to transmit the preamble, receive, from the network node, a random access response message comprising information indicating a timing advance (TA) value and a TAG identity associated with a first TAG of the plurality of TAGs;
• receive, from the network node, a physical downlink control channel (PDCCH) indicating information comprising a TCI state identity associated with a first TCI state of the plurality of TCI states;
• and
• transmit an uplink (UL) transmission, wherein a timing of the UL transmission is adjusted based on the received TA value when the first TCI state of the plurality of TCI states is associated with the first TAG.