Hi Experts,
Can DRX improve drop call rate (DCR) for any scenario?
For VoLTE seen turning Off DRX improved VoLTE drop rate.
You can try to switch Off DRX and smart DRX both mapped with your QCI carrying traffic.
Network doesn’t have VoLTE.
Then please check does your network having short DRX configured and mapped with QCI carrying traffic
If needed DRX inactivity timer can be fine tune, so UE can be more in active state to listen PDCCH.
Yes, Short DRX is configured with QCI carrying traffic.
DRX inactive timer just to let the antenna on for more period, I think it won’t affect DCR.
And UE inactivity timer is 10 so UE will go to idle mode after 10 sec without considering DRX inactivity timer.
RLC MAX RESET Time is always lower when DRX not activated which impact call drop rat.
When DRX is OFF = RLC Polling timer is 50ms, RLC RESET Time = ENodeBMaxRetxThreshold * ENodeBPollRetransmitTimer = 32 * 50ms = 1.6s.
When DRX is ON = (Long DRX Cycle(subframe) - On Duration Timer(subframe) * ENodeBMaxRetxThreshold = (320 - 4) * 32 = 10.112s.
Thanks alot dear!
What about ENodeBPollRetransmitTimer when DRX is ON?
It’s same as normal PS, only difference is DRX ON Time.
When DRX is switched ON, the downlink data cannot be scheduled in sleep state, it must wait for next On durationcycle.
So suppose if some data needs to be re transmitted, it has to wait for the next on duration cycle and If every RLC retransmission waits for next On duration cycle, the RLC RESET max time will increase.
In extreme scenario where every retransmission has to wait to be transmitted in the on duration cycle, the RLC RESET Time will be calculated as follows:
= (Long DRX Cycle(subframe) - On Duration Timer(subframe) * ENodeBMaxRetxThreshold = (320 - 4) * 32 = 10.112s
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Yes.
But why we didn’t put EnodeBPollRetransmitTimer in this equation ?
When DRX open, because the DRX sleep time (cycle, default LongDrxCycle = 320ms), each RLC retransmission will do per about 320ms.
I see, Thanks dear!