Question: In UTRAN Iur interface (RNSAP signalling) for 1.28Mcps TDD, what are the possible spreading factors for an Orthogonal Variable Spreading Factor (OVSF) Channelisation Code?
Option 1: 1, 2, 4, 8, and 16
Option 2: 2, 4, 8, 16, and 32
Option 3: 1, 4, 8, 16, and 32
Option 4: Only fixed at 8 for all cases
Explanation: In UTRAN's 1.28Mcps TDD mode, OVSF codes are used for Channelisation Codes, offering variable spreading factors that impact data rate and capacity. The spreading factors of 1, 2, 4, 8, or 16 enable flexible resource allocation for different services (e.g., voice, data, multimedia), crucial for efficiently managing UTRAN radio resources.