enhanced fast dormancy solution

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Enhanced Fast Dormancy


2000• Feature phone• ~1000 apps

2011• Smart device• ~ 350,000 apps

2020• Devices beyond population• Apps exceed billions

SNSEntertainment

Education

Business& Finance

From thousands to

Billions

From ‘peer-to-peer’ to

‘All-to-All’

From simple

communication to Digital

Lifestyles

Smart Devices & Applications Will Continue to Explode


No Service MSN Facebook Twitter

iPhone Every 10-15 minutes, heart beat with apple push server 5- 6s Every 55 - 60 seconds

Every 50 seconds, interaction with twitter.com

HTC Android No heart beat 40-60s UE setting (in service client on terminal)

What is Heart Beat

“Heart Beat” Increases both Signaling and Service Traffic

Frequent “Heartbeat”Frequent “Heartbeat”

Common UESignalling

Data

Smartphone

HeartbeatData Service Data Service

User Idle Status

The ‘Heart Beats’ of smart phones are actually caused by Services

When the application is in use, sometimes the user is doing nothing at all. (For example, waiting for message coming when using MSN).

During the time described as above, UE will send “Heart Beat” message to inform the AP server that the application is still on.


Fast Dormancy Causes Signaling Storm

SmartPhone90%

Smartphone Fast Dormancy

SmartPhone90%

Normal RRC Release

DCH IDLE DCH IDLE

20 seconds

No data transmissionNo data transmission

……

Around 6 seconds

‘Fast Dormancy’ difference is related to terminal type and the OS.

iPhone 6 sec Balck Berry 6 secs

HTC Android 8 sec HTC Windows no fast dormancy

When UE transfer from DCH to IDLE, 35 signaling message is interacted between UE and the network.Fast dormancy makes signaling interaction more frequently.

How Fast Dormancy Causes Signaling Surge

HUAWEI TECHNOLOGIES CO., LTD.Page 5

EFD/R8 FD Cell_PCH Reduce 50-80% Signalling Msg

DCH

IDLE

Normal Fast Dormancy

Idle<->DCH<->Idle

( 35 Signaling Message)

PS Signaling Message

60% 60% 60%

10%0%

20%

40%

60%

80%

100%

Normal Smart Data Service

Pre smart procedure

<20%

100%

50%Post smart procedure

Signalling


DataIdle

Data service Heartbeat

FACH

PCH

FACH

DCHPCH

PCH<->FACH<->DCH <->PCH


PCH<->FACH<->PCH


EFD/R8 FD

Data service Heartbeat


PCH

Heartbeat


FD and EFD&R8 FD Comparison When fast dormancy enhancement is not applied, the RRC connection of the UE is released when the RNC

receives the SCRI.

When fast dormancy enhancement is applied, the RNC can change the UE status to the CELL_PCH state instead of idle mode.

R8 fast dormancy UEs

pre fast dormancy UEs in white list

UE without EFD


R8FD solution

•To save the power, when there is no PS data transfer, UE can send a SCRI message to require RNC release the RRC connection ,RNC will release the RRC connection, then each of the following heartbeat messages will cause RRC connection setup, authentication, encryption and RAB setup procedures.

•With R8 FD, when R5^R8 send SCRI cause is “UE Requested PS Data session end”， RNC will decided to transfer the state of the UE to CELL/URA_PCH instead of IDLE mode. Foe those no cause or other cause case ， RRC release directly, UE go to IDLE states 。


EFD for Different Terminal

R8 Fast Dormancy

UE sends a SIGNALLING CONNECTION RELEASE INDICATION (SCRI) message to the network with the IE “Signaling Connection Release Indication Cause” set to “UE Requested PS Data session end”. Such as iPhone 4.2.1 （ iPhone4 ）RNC will transit UE state from CELL-DCH to CELL-FACH to CELL-PCH/URA-PCH.

Pre-R8 Fast Dormancy

R5 or R5 above UE sends a SIGNALLING CONNECTION RELEASE INDICATION (SCRI) message to the network without any cause.

RNC will transit UE state from CELL-DCH to CELL-FACH to CELL-PCH according to IMEI TAC white list.Currently Just support iPhone

Other UE

UE sends a SIGNALLING CONNECTION RELEASE INDICATION (SCRI) message to the network without any cause.

RNC will directly release this UE to IDLE

• R8 and Pre-R8 Fast Dormancy UE Comparison


State transitions for R8 fast dormancy UEs and EFD UEs


PS Inactivate Timer For Fast DormancyFAST DORMANCY USER Timer in CELL_PCHMeaning ： This parameter specifies the value of the CELL-PCH inactivity timer for UEs enabled with the Fast Dormancy feature. When detecting that the Fast Dormancy User in PS domain had no data to transfer in CELL-PCH for a long time which longer than this timer, the UE is released. Recommended Value ： 1800

FAST DORMANCY USER Timer in CELL_FACHMeaning ： This parameter specifies the value of the CELL-FACH inactivity timer for UEs enabled with the Fast Dormancy feature. When detecting that the Fast Dormancy User in PS domain had no data to transfer in CELL-FACH for a long time which longer than this timer, the state transition from CELL-FACH to CELL-PCH is triggered. Recommended Value ： 5

FAST DORMANCY USER Timer in CELL_DCHMeaning ： This parameter specifies the value of the CELL-DCH inactivity timer for UEs enabled with the Fast Dormancy feature. When detecting that the Fast Dormancy User in PS domain had no data to transfer in CELL-DCH for a long time which longer than this timer, the state transition from CELL-DCH to CELL-FACH or CELL-PCH is triggered. Recommended Value ： 4

Fast Dormancy User FACH to DCH/HSPA 4A ThresholdMeaning ： This parameter specifies the threshold of the traffic volume of 4A event for triggering the transition of fast dormancy user from FACH to DCH/HSPA.Recommended Value ： D1024

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Copyright©2011 Huawei Technologies Co., Ltd. All Rights Reserved.The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.


UE Working Modes and States

• Idle Mode • Connected Mode

› CELL_DCH› CELL_FACH› CELL_PCH› URA_PCH


UE Working Modes and States

CELL_DCH CELL_FACH

CELL_PCHURA_PCH

IDLE- Monitor paging channel- Cell re-selection

- Dedicated channel- Common service, such as voice

- Reduce activity, DTX, and save powerRRC Connection

- Common channel- PS service with few

data to transmit

- Reduce activity further- Avoid unnecessary

signaling


Idle Mode

• The UE has no relation to UTRAN, only to CN. For data transfer, a signaling connection has to be established.

• UE camps on a cell› It enables the UE to receive system information from the PLMN › UE can monitor PICH of a cell for paging

• The idle mode tasks can be divided into three processes:› PLMN selection and reselection› Cell selection and reselection› Location registration


Connected Mode

• When UE is in connected mode› The UE position can be known on different levels:

» Cell level (CELL_DCH/CELL_FACH/CELL_PCH)» UTRAN Registration Area (URA) level (URA_PCH)

› The UE can use different types of channels in connected mode» Dedicated transport channels (CELL_DCH) » Common transport channels (CELL_FACH)


Connected Mode

• Cell-DCH› In active state› Communicating via its dedicated channels › UTRAN knows which cell UE stays in


Connected Mode

• Cell-FACH› In active state› Few data to be transmitted both in uplink and in downlink. There is no

need to allocate dedicated channel for this UE› Downlink uses FACH and uplink uses RACH› UE needs to monitor the FACH for its information› UTRAN knows which cell the UE stays in


Connected Mode

• Cell-PCH› No data to be transmitted or received› Monitor PICH, to receive its paging› UTRAN knows which cell the UE stays in› UTRAN has to update cell information of UE when UE roams to

another cell› Lower the power consumption of UE


Connected Mode

• URA-PCH› No data to be transmitted or received

› Monitor PICH, to receive its paging

› UTRAN only knows which URA (which consists of multiple cells) that UE

stays

› UTRAN updates UE information only after UE has roamed to other URA

› A better way to reduce the resource occupancy and signaling transmission

enhanced fast dormancy solution

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