Question: In a MAC subheader for Random Access Response (RAR), if the Type field (T) is set to 1, which field will be present and what is its size?
Option 1: Backoff Indicator (BI) field, with a size of 2 bits
Option 2: Random Access Preamble IDentifier (RAPID) field, with a size of 4 bits
Option 3: Reserved bit (R) field, with a size of 8 bits
Option 4: Random Access Preamble IDentifier (RAPID) field, with a size of 6 bits
Explanation: When the Type field (T) is set to 1, it indicates the presence of a Random Access Preamble IDentifier (RAPID) field, used to identify the transmitted Random Access Preamble, with a defined size of 6 bits, crucial for efficient random access procedure management in NR networks.