Question: For User Equipment (UE) conformance testing in Evolved Universal Terrestrial Radio Access (E-UTRA), what is the default channel bandwidth applied to sidelink direct communication signalling tests for bands 31 and 72?
Option 1: 10/20 MHz
Option 2: 5 MHz
Option 3: 15/20 MHz
Option 4: 1.4/5 MHz
Explanation: According to the specifications for UE conformance testing, sidelink direct communication on bands 31 and 72 utilizes a default channel bandwidth of 5 MHz, distinguishing it from other bands which may use different default bandwidths (e.g., 10 MHz for most bands). This specific bandwidth is chosen to optimize performance while minimizing interference within these particular frequency bands.