5G Small Data Transmission Timer Logic for Cell Reselection

The patent applies dynamics by making the timer start conditional rather than fixed. The timer is dynamically started only when specific criteria are met (small data transmission required, uplink data available, RRC resume request transmitted). This conditional timing mechanism resolves the contradiction by avoiding premature timer expiry while still monitoring response time when necessary.

The patent changes the parameter of timer activation from a fixed state to a conditional state. By introducing criteria-based timer startup (checking small data transmission requirement, uplink data availability, and RRC resume request status), the system adapts the timer parameter to actual transmission needs, preventing unnecessary expiry while maintaining response monitoring capability.

The patent applies preliminary anti-action by preemptively handling cell reselection before it can cause data loss. When cell reselection is detected during connection resume, the terminal checks whether small data transmission is ongoing and takes preventive actions (stopping the timer, maintaining RRC_INACTIVE state) to counteract the potential harmful effect of procedure interruption.

The patent provides beforehand cushioning by preparing compensatory measures in advance. When cell reselection occurs during small data transmission, the terminal has pre-configured actions ready (timer management, state maintenance, criteria re-evaluation) to cushion against data loss, ensuring transmission reliability is maintained despite the interruption.