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Here I write on How Inter-RAT Mobility performs in LTE, means
Handover to LTE andMobility from LTE.
Handover to LTEProced re for !andover of LTE is lar"ely t!e same
as t!e !andover proced re in LTE. T!e maindifference is t!at t!e
!andover to LTE A# a w!ole-confi" ration m st be si"naled, and t!e
LTEit is possible to se $ si"nalin" delta %, accordin" to w!ic!
only t!e c!an"es in t!e confi" rationare displayed.
If yo li&e to offer s bscribers a better !andover !ad not
yet been activated in previo sI'#TALLME'T#, E-(TRA' activates
)ip!erin", possibly sin" t!e '(LL al"orit!m, as part oft!e proced
re. E-(TRA' also establis!es #R*+, #R* and one or more of t!e R*s
i.e. at leastR* is associated wit! t!e defa lt %bearer of EP#/.
Mobility from LTE0enerally, t!e proced re for LTE mobility from
anot!er RAT s pports bot! !andover and )ell)!an"e 1rder ))1/,
possibly wit! Assistance 'etwor& 'A)) 2 'etwor& Assisted
)ell)!an"e/. T!e proced re ))1 3 'A)) is applicable only to 0ERA'
mobility.
Mobility from LTE is performed only after sec rity !as been
activated. 4!en sed for en!anced)#5*+6 for ) MA 777, t!e !andover
proced re incl des s pport for parallel ie bot! +8RTTand HRP /, s
rrendered to +8RTT alon" wit! redirection to HRP , and redirection
to HRPonly.
T!e proced re is s!own in 5i" re.
+. T!e (E may send a Meas rement Report messa"e.
. In t!e case of !andover nli&e ))1/, t!e so rce e'ode* re9
ests t!e tar"et radio accessRA'/ node to prepare for !andover. As
part of t!e so rce of %t!e !andover of preparin" t!e9 ery: e'ode*
provides information on applicable between RAT (E capabilities, as
well as
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information abo t t!e c rrent set-carriers. In response to t!e
tar"et RA' "enerates a $!andovercommand, and ret rns t!e so rce
e'ode*.
;. #o rce e'ode* sends a messa"e from t!e mobile team to E(TRA
(E, w!ic! incl des inter-RAT or messa"e received from t!e tar"et in
t!e case of transmission/, or t!e tar"et cell 3fre9 ency and
inter-RAT several parameters in t!e case of )1)/.
