Extension mode-based transmission or reception method and apparatus in narrowband assisted-ultra wideband wireless network system

A first device apparatus in a narrowband assisted (NBA)-ultra wideband (UWB) wireless network system, the apparatus comprising:

• at least one transceiver;
• and
• at least one processor connected to the at least one transceiver,
• wherein the at least one processor is configured to:
• transmit, through the at least one transceiver, to a second device, a first compressed physical layer service data unit (PSDU) including an extension-related field in a ranging control phase (RCP) or a measurement report phase (MRP);
• and
• based on the extension-related field included in the first compressed PSDU indicating that an extension exists, transmit, through the at least one transceiver, a second compressed PSDU to the second device in the RCP or the MRP.

A second device apparatus in a narrowband assisted (NBA) ultra wideband (UWB) wireless network system, the apparatus comprising:

• at least one transceiver;
• and
• at least one processor connected to the at least one transceiver,
• wherein the at least one processor is configured to:
• receive, through the at least one transceiver, from a first device, a first compressed physical layer service data unit (PSDU) including an extension-related field in a ranging control phase (RCP) or a measurement report phase (MRP);
• and
• based on the extension-related field included in the first compressed PSDU indicating that an extension exists, receive, through the at least one transceiver, a second compressed PSDU from the first device in the RCP or the MRP.