Method And Apparatus Of Physical Random Access Channel Timing Advance Operation In Non-Terrestrial Network Communications

A method, comprising:

• configuring, by a processor of an apparatus, a first set of physical random access channel (PRACH) configuration to a first set of user equipment (UE);
• configuring, by the processor, a second set of PRACH configuration to a second set of UE;
• and
• receiving, by the processor, a RACH preamble signal according to the first set of PRACH configuration and the second set of PRACH configuration,
• wherein the first set of UE comprises a timing advance pre-compensation capability, and wherein the second set of UE comprises no timing advance pre-compensation capability.

An apparatus, comprising:

• a transceiver which, during operation, wirelessly communicates with a network node of a wireless network;
• and
• a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:
• determining a propagation delay between the apparatus and a network node;
• determining a pre-compensation timing margin;
• performing a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin;
• and
• transmitting, via the transceiver, an uplink signal by applying the timing advance pre-compensation.

An apparatus, comprising:

• a transceiver which, during operation, wirelessly communicates with a plurality of user equipment (UE) of a wireless network;
• and
• a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:
• configuring a first set of physical random access channel (PRACH) configuration to a first set of UE;
• configuring a second set of PRACH configuration to a second set of UE;
• and
• receiving, via the transceiver, a RACH preamble signal according to the first set of PRACH configuration and the second set of PRACH configuration,
• wherein the first set of UE comprises a timing advance pre-compensation capability, and wherein the second set of UE comprises no timing advance pre-compensation capability.