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Wednesday, 20 October 2010

Fast Dormancy in Release-8

Nokia Siemens Networks has collaborated with Qualcomm to carry outthe industry’s first successful interoperability test of the new 3GPP

standardized Release 8 Fast Dormancy feature. Unlike proprietary

approaches to fast dormancy, the new standard allows operators to take

full advantage of smart network features such as Cell_PCH without

worrying that individual handset settings will ignore network controls.

The test was conducted at Nokia Siemens Networks’ Smart Lab in Dallas

using Nokia Siemens Networks’ Flexi Multiradio Base Station and Radio

Network Controller and Qualcomm’s QSC7230TM smartphone optimized

chipset. The test showed how smartphones can act dynamically, exploitingCell_PCH on Nokia Siemens Networks’ smart networks or adjusting to

Fast Dormancy on other vendors’ traditional networks.

In fact the operators have been getting upset quite for some timebecause of smartphone hacks that save the UE battery life but causenetwork signalling congestion. See here.

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To explain the problem, lets look at the actual signalling that occurswhen the UE is not transmitting anything. Most probably it gets putinto CELL_PCH or URA_PCH state. Then when keep alive messagesneed to be sent then the state is transitioned to CELL_FACH and oncedone its sent back to CELL_PCH. Now the transitioning back fromCELL_FACH (or CELL_DCH) to CELL_PCH can take quite some time,

depending on the operator parameters and this wastes the UE batterylife.

To get round this problem, the UE manufacturers put a hack in thephone and what they do is that if there no data to transmit for a smallamount of time, the UE sends RRC Signalling Connection ReleaseIndication (SCRI) message. This message is supposed to be used in casewhen something is gone wrong in the UE and the UE wants thenetwork to tear the connection down by sending RRC ConnectionRelease message. Anyway, the network is forced to Release theconnection.

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If there is another requirement to send another keep alive message(they are needed for lots of apps like Skype, IM's, etc.) the RRCconnection would have to be established all over again and this cancause lots of unnecessary signalling for the network causing congestionat peak times. To speed up the transitioning to CELL_PCH state in Release-8 whenthe UE sends SCRI message, its supposed to include the cause value as"UE Requested PS Data session end ". Once the network receives thiscause it should immediately move the UE to CELL_PCH state.

This is a win win situation for both the network and the UE vendors aslong as a lot of UE's implement this. The good thing is that even a pre-Rel8 UE can implement this and if the network supports this feature itwould work. GSMA has created a best practices document for this feature which isembedded below.

GSMA: Fast Dormancy Best Practices

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View more documents from Zahid Ghadialy

Further Reading:

UMTS State Switching and Fast Dormancy Evolution - MartinSauter

•

RP-090941 - System impact of poor proprietary Fast Dormancyimplementations

•

RP-090942 - Clarification on Enhanced SCRI approach for fastdormancy

•

RP-090960 - Configuration of Fast Dormancy•R2-096882 - Changes to Release-8 Fast Dormancy•

Posted by Zahid Ghadialy at 07:15

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LTE Signaling said...

Does Fast Dormancy Matter?Should we be designing our latest and most advancedcellular network technologies to accommodateinadequate battery technology in today’s devices? It’sbeen supposed that the fact that smartphones todayenter “idle” mode when a data transmission to themobile device ceases for a few seconds. This repeateddisconnect and connect of a data session is purported tosave battery life while adding a significant amount of signaling to the LTE network... Read more by RandySnyder at the following.http://diametriq.blogspot.com/2012/08/does-fast-dormancy-matter.html

29 August 2012 20:02

mitratech said...

How can i find a list of 3gpp release 8 complyingdevices ?

Regards

5 September 2012 14:24

Prakash N said...

How do you know whether release 8 UE Supports Fast

Dormacy or not ?Which parameter in the UE shows whether it supportsFast dormacy ?I have looked RRC connection V8 message but could notable to find appropriate parameters ?

26 December 2012 09:15

Zahid Ghadialy said...

There is no easy way to find if the UE is supporting fastdormancy or not. In the test environment, when the datacall is started and no data is being sent, if the UE sendsSCRI with cause other than "UE Requested PS Datasession end" (this cause came in Rel-8) then it supportsfast dormancy. A rel-8+ UE will send "UE Requested PSData session end" showing that it supports Network Controlled Fast Dormancy (NCFD).

26 December 2012 10:29

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