What are cons of fast dormancy?

Hi All, can any one tell what are cons of fast dormancy?

FD or EFD?
More users will in FACH state

The objective of Fast Dormancy is to reduce the battery power consumption of the device . Fast dormancy behavior is characterized by the ratio of the number of RRC Signaling Connection Release Indications /the number of RAB establishment ,abbrivated as SCRI /RAB.

this is the concept , to reduce the battery , the special algorythm is behind it

@mharris is askimg Cons

The great benefits is the mobile no need to do all the process like when you stay in idle mode
If you don’t have the second channel FACH will affect the paging because maybe you have congestion on FACH channel

These are Pros!!

That’s a con

How to know, this feature is enabled in our network?

Before R8, fast dormancy was not standardized so RNC was putting UE to idle upon receiving SCRI. This was causing so called signalling storm. After R8, UEs sent SCRI with cause value indicating battery saving purpose so RNC could put such UEs in FACH or PCH state this eliminating the signaling storm

This eliminating = thus eliminating*

However pre R8 UEs still send SCRI without any cause and RNC release the UE to idle
However u can have an IMEI TAC list configured for such UEs on RNC, so that RNC can still put these pre R8 UEs to FACH/PCH state upon receiving SCRI


Great thanks. Does its effect any KPI? I think RRC sr will degrade

CSSR (Call Setup Success Rate)

As no of attempts also decrease

attempts less offcourse

Yes. RAB also? Or ony RRc part

Yes but thats not real degradation.

Need to balance, optimization is not solution to eliminate 100% problems or only improvements, again benefits vs degradation

EFD is basic feature for smart phone for OTT services

EFD = enhanced fast dormancy?

OTT? What is this?


over-the-top content (OTT) is the audio, video, and other media content delivered over the Internet without the involvement of a multiple-system operator (MSO) in the control or distribution of the content.