Interactive animation

Follow one eDRX cycle

The orange marker is a network downlink command. The dark cursor is the device's current position in the cycle.

Stage 1 Extended sleep
Stage 2 Wake before PTW
Stage 3 Listen for paging
Stage 4 Return to sleep
Deep sleep Paging Time Window Queued downlink
t = 0 s of 2.91 h
Low-power idle Device sleeps for 2.91 h minus the PTW.
PTW: reachable by paging The UE listens for paging occasions inside this window.
Cycle start PTW opens near 2.91 h Next cycle

Device state: extended sleep

The UE is in idle mode and is not checking normal paging occasions. It keeps enough context to wake for the negotiated eDRX paging window.

The downlink command has arrived before the PTW, so the network queues the page until the UE listens again.

Power profile

The estimate covers the paging-listen budget only. Uplink reports, attach, retransmissions, and poor coverage can dominate real battery life.

Sleep time
99.95%
PTW time
0.05%
Energy share
89%
Design diagnosis This profile gives very low paging-listen duty cycle, but downlink commands must tolerate long waits. It suits metering or monitoring better than emergency remote control.
Guided tasks

Use the controls like a network designer

Each task changes one decision, so the effect on reachability and energy is easy to see.

Task A Make a device commandable within one minute.

Choose the commandable valve preset, then shorten the eDRX cycle until the worst-case waiting time is acceptable.

Task B Protect a battery meter.

Select the smart meter preset and make the PTW as short as practical. Notice that most energy is still spent while listening.

Task C Compare eDRX with PSM.

Use the diagnosis text: eDRX is periodically reachable; PSM is usually not network-reachable until the device wakes itself.