191129396 cell update fach state transfer 1205

8/20/2019 191129396 Cell Update FACH State Transfer 1205

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HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level:10/08/15

Cell update & FACH Transfer


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Content

* UE Working Modes and States

* Cell Update and FHHO Scenarios

* Main Reason for CDR Increase in FACH

* Proble and Sol!tions


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U !or"in# $odes and %tates

Idle Mode

Connected Mode

C'(CH

C'FACH

C')CH U*A')CH


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+dle $ode

The UE has no relation to UTRAN, only to CN. Any data

transfer, a sinallin connection should have to !e

esta!lished.

UE ca"#s on a cell

+t ena,les the U to recei-e sstem information from the )$

U can monitor )+CH of a cell for pa#in#

The idle "ode tas$s can !e divided into three #rocesses:

)$ selection and reselection

Cell selection and reselection

ocation re#istration


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Connected $ode

%hen UE is in connected "ode The U position can ,e "nown on dierent le-els

Cell le-el 2C'(CH/C'FACH/C')CH3

UT*A *e#istration Area 2U*A3 le-el 2U*A')CH3

The U can use dierent tpes of channels in connected mode

(edicated transport channels 2C'(CH3

Common transport channels 2C'FACH3


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Connected $ode

Cell&'C( +n acti-e state

Communicatin# -ia its dedicated channels

UT*A "nows which cell U stas in


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Connected $ode

Cell&)AC(

+n acti-e state

Few data to ,e transmitted ,oth in uplin" and in downlin". There is

no need to allocate dedicated channel for this U

(ownlin" uses FACH and uplin" uses *ACH

U needs to monitor the FACH for its information

UT*A "nows which cell the U stas in


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Connected $ode

Cell&*C(

o data to ,e transmitted or recei-ed

$onitor )+CH4 to recei-e its pa#in#

UT*A "nows which cell the U stas in

UT*A has to u#date cell infor"ation of UE when U roams to

another cell ower the power consumption of U


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Connected $ode

URA&*C( o data to ,e transmitted or recei-ed

$onitor )+CH4 to recei-e its pa#in#

UT*A onl "nows which U*A 2which consists of multiple cells3

that U stas

UT*A updates U information onl after U has roamed to otherU*A

A ,etter wa to reduce the resource occupanc and si#nalin#

transmission


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U !or"in# $odes and %tates

C'(CH C'FACH

C')CHU*A')CH

+(

(A( %can networ"s 2)$3 Camp on a cell

$onitor pa#in# channel Cell reselection

(edicated channel Common ser-ice4

such as -oice

*educe acti-it4 (*64

and sa-e power**C Connection

Common channel )% ser-ice with few

data to transmit

*educe acti-it further

A-oid unnecessarsi#nalin#


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FHH7 ： Forward Hard Hando-er

)((+ used to "onitor the RRC connection state onco""on channel, hich #rocess the "o!ility of UE

on Co""on Channel

)((+ also contains the RRC connection re!uilt in

'C(. )((+ includin Cell U*'ATE and URA U*'ATE-only

occurs in URA*C(/


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FHH7 Function（ C'(CH）

RLC Un&recovery Error: recover the RL hen UE cannotnor"al co""unicate ith UTRAN e0ualed RLC layer

usin AM "ode

RL failure: usin in RRC connection re!uilt, hen all

the RLs loss of synchroni1ation, UE try to re!uilt the

RRC connection ith UTRAN


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*elation ,etween FHH7 and **C %tate

RRC Conne$tion "tate Reali,a!le F. Fun$tion（

update $au"e）

C/LLC Cell 2pdate RLC /RR 、 RL F%L

C/LLF%C Cell 2pdate )eriodical Cell update4 Cell

reselection4 *eenter %er-in# Cell4 RLC /RR

C/LLPC Cell 2pdate )eriodical Cell update4 Cell

reselection4 *eenter %er-in# Cell4 )a#in#

*esponse4 U (ata Transmit3

2R%PC Cell 2pdate )a#in# *esponse4 U (ata

Transmit34 2R% 2pdate )eriodical U*A update4

U*A reselection3


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Cell Update Function *eriodical Cell u#date: UE "ovin ithin one cell "a2ority

ay to "onitor RRC connection

Cell reselection: UE "o!ility state cross di3erent cells, "a2or

ay of UE $ee# RRC connection ith UTRAN servin in

Co""on Channel.

Re&enter Service Area: another ay to $ee# RRC connection

hen "ove, T456 e7#ired RLC Un&recovery Error: recover the RL hen UE cannot

nor"al co""unicate ith UTRAN e0ualed RLC layer usin AM

"ode

*ain Res#onse res#onse to #ain ty#e 8 fro" UTRAN

hen RRC connection e7ist UL 'ata Trans"it UE infor" UTRAN needin data trans"it


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U*A Update Function

*eriodical URA u#date: URA I' contained in Cell syste" infoith UE "o!ility

URA reselection: URA I' not in the syste" info hen UE "ove


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Cell Update %i#nalin# Flow

Page &"


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Main reasons for the C'R increaseon )AC(

*S call dro# after () R; Recono crossed!y )( R; Recon


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*eason and %olutions

Reason

No #oer control on )AC(

No Soft(+ on )AC(

The state not consistent !eteen UE and RAN

Solutions

'ecrease Users on the )AC( state !y decrease ()

volu"e threshold

Con


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Than" ou

www.huawei.com


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*T+ *adio etwor" Temporar+denti9er )ive ty#es of RNTI e7ist

%er-in# *C *T+ 2%*T+3

(rift *C *T+ 2(*T+3

Cell *T+ 2C*T+3

UT*A *T+ 2U*T+3 H%(%CH *T+ 2H*T+3


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Cell update :ow（ );F）

U **$ ** F$* %+<

(CCCHCell update con9rm

Appl radio resource

UCCCHCell update re=uest

+f $ACC/$AC( in dierent ,oard， ,uilt AA> connection

?uilt $ACC and $AC( lo#ical channel

U(CCH)hsical channal recon9#uration

complete

Cell update and U stateindicate

*C restore


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Cell update with relocation（ )%）


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Cell update with relocation（ )%）


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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential>5

UEDR"C

So!rce

DR"C

#arget SRNC

R"SAP R"SAP'6 Coon Tran"p6 C7annel Re"our$e" Relea"e

R"SAPR"SAP

&6 2plin) +ignalling Tran"8er

ndi$ation

R"SAP

36 Coon Tran"p6 C7annel Re"our$e"

nitiali,ation Re9ue"tR"SAP

RRC16 CCC: Cell 2pdate

RRC$rela%

RRC

6 CC: Cell 2pdate Con8ir

RRC

RRC;6 CC: RNT Relo$ation Coplete

RRC

R"SAPR"SAP

46 Coon Tran"p6 C7annel Re"our$e"initiali,ation Re"pon"e

56 %LC%P ur !earer "etup

FHH7（ Cell Update crossin# +U*）


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UE#arget

R"C

56CCC: 2R% 2pdate Con8ir

So!rce

R"C

&62plin) +ignalling Tran"8er ndi$ation

Ser&ing

R"C

[ new C-RNTI,D-RNTI, UL message]

16CCC: 2R% 2pdate

[U-RNTI, URA update cause]

RRC-rela#RRC

36 e$i"ion Not to

per8or +RN+

relo$ation

RRC RRC-rela#

RN+%P

RN+%P

46 o


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FHH7 Flow-. R/S

Cell -pa0e

Cell -pa0e Con1ir"

-. R/S

Cell -pa0e

Cell -pa0e Con1ir"

-*RA/ 2o3ili0( &n1o Con1ir"

-. R/S

Cell -pa0e

Cell -pa0e Con1ir"

RB Release Co"ple0e

Cell +pa0e pro!e+re 4i05 raio 3earer release

Cell +pa0e pro!e+re 4i05 +pa0e o1 -*RA/ "o3ili0( in1or"a0ion

Cell +pa0e pro!e+re 4i05 raio 3earer release

-. R/S

Cell -pa0e

Cell -pa0e Con1ir"

RB re!16 !o"ple0e

Cell +pa0e pro!e+re 4i05 raio 3earer re!on1i6+ra0ion

-. R/S

-RA -pa0e

-AR -pa0e Con1ir"

-RA +pa0e pro!e+re7 3asi! 1lo4

-. R/S

-RA -pa0e

-AR -pa0e Con1ir"

-*RA/ 2o3ili0( &n1o Con1ir"

-RA +pa0e pro!e+re 4i05 +pa0e o1 -*RA/ "o3ili0( in1or"a0ion

191129396 cell update fach state transfer 1205

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