7/26/2019 3GPP Releases 7 and 8 Introduced Enhanced

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3GPP Releases 7 and 8 introduced Enhanced

Cell_FACH, which brings lower latency or user de!ices in the Cell_FACH

state, not re"uiring high data !olu#es$ %his is achie!ed by reduced

signaling and the use o high s&eed H'PA channels in () and *) in

the Cell_FACH state$ +etwor signaling load is greatly reduced and

ast transition ro# inacti!e to acti!e &ro!ides an -always on. usere/&erience$ Additionally, Enhanced Cell_FACH includes Enhanced (R0,

which allows inacti!e de!ices to turn o1 their rece&tion to reduce

battery consu#&tion, waing inter#ittently to e/change short data

bursts while in the Cell_FACH state$ Ater a longer &eriod o inacti!ity

the de!ice is co##anded to enter Cell_PCH state, which sa!es e!en

#ore battery &ower$ Enhanced Cell_FACH solution taes ull ad!antage o the

3GPP eature and co#bined with the s#art algorith#s or inacti!ity

detection, RRC state selection and Cell_PCH use, &ro!ides the best

custo#er e/&erience in ter#s o2

high data rates in Cell_FACH

real -always on. eeling

ast state transitions ro# Cell_PCH to Cell_FACH 4tens o 

#illiseconds5

 %he solution also increases ca&acity and reduces signaling on

s#art&hone6do#inated networs$

E/&ected benets2

Reduced signaling in the networ

ncreased through&ut

9ore users su&&orted

#&ro!e#ent o *) ca&acity

3GPP introduced Enhanced Cell_FACH in () in Release 7$ Enhanced

Cell_FACH in *) and Enhanced (R0 or *E in Cell_FACH were

introduced in Release 8$ %hese three eatures #ae u& the co#&lete

Enhanced Cell_FACH 4E6FACH5, thus allowing H'PA networs to use

the Cell_FACH state or s#aller and #ediu# si:e data &acets while at

sa#e ti#e bringing aster s&eeds, lower latency and battery sa!ings

or the user$

 %he downlin &art o E6FACH is also called High '&eed Cell_FACH (), or

H'6FACH, because it uses the H'6('CH channel instead o the FACH

channel in (), while staying in the Cell_FACH state$ 'i#ilarly, the u&lin&art o E6FACH is also called High '&eed Cell_FACH *), or H'6RACH

due to the use o the E6(CH channel instead o the RACH channel in

*), while staying in the Cell_FACH state$

Enhanced Cell_FACH 4E6FACH5 eature in this docu#ent reers to High

'&eed FACH 4H'6FACH5, High '&eed RACH 4H'6RACH5 and Enhanced

(R0 4e(R05 co#bined$

7/26/2019 3GPP Releases 7 and 8 Introduced Enhanced

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Enhanced Cell_FACH 4E6FACH5 state in this docu#ent reers to a

*E in Cell_FACH state with H'6FACH in (), H'6RACH in *) and

e(R0 congured$