Question: In MBMS, what is the primary purpose of implementing back-off timing in consumption reporting, and how does the absence or value of '0' for the `offsetTime` attribute affect UE behavior?
Option 1: To prioritize report submissions based on UE location; absence/value '0' of `offsetTime` leads to immediate report submission without randomization.
Option 2: To spread the load of consumption reports uniformly over time; absence/value '0' of `offsetTime` results in a fixed delay before report submission.
Option 3: To encrypt consumption reports for security; absence/value '0' of `offsetTime` disables encryption for faster transmission.
Option 4: To spread the load of consumption reports uniformly over time; absence/value '0' of `offsetTime` means no initial wait time, proceeding directly to randomization within the `randomTimePeriod`.
Explanation: Back-off timing in MBMS distributes the load of consumption reports evenly over time, enhancing network efficiency. With an absent or '0' `offsetTime`, UEs don't wait before generating a random submission time within the specified `randomTimePeriod`, directly contributing to the uniform spread of report submissions without an initial delay, supporting timely reception and processing by the BM-SC for dynamic service management decisions.