Cellular Radio Access Attachment Sequence Current Optimization Strategies
Cellular attachment current drops significantly when restricted band scanning and extended PSM timers prevent full-spectrum RF searches during initial registration.
eDRX T3324
Meaning
Extended discontinuous reception protocols utilize an active monitoring period to ensure that a mobile module can receive downlink data before entering a low power state. The eDRX T3324 timer dictates the duration of this active phase. A module starts the timer immediately upon transitioning from connected to idle mode.
Once the timer expires, the device enters a deeper sleep state where the transceiver shuts down entirely.
Timer Mechanism
Timer operations begin immediately upon the transition from connected to idle mode. During the active run of the eDRX T3324, the receiver periodically listens to the paging channel according to the negotiated cycle. Paging cycles must be long enough for the network to deliver downlink packets that were queued during the sleep phase.
Current Consumption
Power profiles of connected modules vary dramatically between the active monitoring state and the sleep state. During the time governed by the eDRX T3324, the average current consumption remains high because the receiver circuitry wakes up at each paging occasion. Minimizing this active duration directly reduces the energy drawn from the battery.
High-capacity battery cells can sustain longer active periods when rapid downlink response is required.
Network Negotiation
Requesting specific values during the initial attach sequence allows the module to influence its sleep cycle. The network makes the final determination of the eDRX T3324 value, which it transmits back to the device in the accept message. Devices must accept the allocated value to maintain network synchronization.