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Transcript of HSDPA Principle.ppt
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© 2007 ZTE Corporation
HSDPA Principle
PPT Series for Technology Principle
PPT Series for Technology Principle
Name :×××
E-mail :×××
WCDMA Product Planning Dept.
ZTE Marketing S!tem
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2
HSDPA H igh S peed Downlink P acket Access
H S D P A
HSUP A
… …
3G
4G
HSDPA is a new technology introduced in R5
Goal: To provide a packetoriented wireless
!road!and access service with high per"or#ance
price ratio$ high downlink !andwidth and short delay
"or %&D'A
(GPP R5 standards are "ro)en in *une$ 2++,
HSDPA is a new technology introduced in R5
Goal: To provide a packetoriented wireless
!road!and access service with high per"or#ance
price ratio$ high downlink !andwidth and short delay
"or %&D'A
(GPP R5 standards are "ro)en in *une$ 2++,
S#all #odi"ication to R--.R/ structure
HSDPA insists on the concept o" s#oothevolution0 HSDPA is the enhance#ent o" R--
structure with the newly added 'A&hs layer to
achieve HAR1$ scheduling and A'&0 t also adds
three dedicated channels on the physical layer0
S#all #odi"ication to R--.R/ structure
HSDPA insists on the concept o" s#oothevolution0 HSDPA is the enhance#ent o" R--
structure with the newly added 'A&hs layer to
achieve HAR1$ scheduling and A'&0 t also adds
three dedicated channels on the physical layer0
#prove the syste# capacity !y applying new
technologies
Share channel trans#ission3ast Scheduling
Shorter TT 3ast retrans#ission and so"t
co#!ination
4ink Adaptive Per#itting High order #odulation
#prove the syste# capacity !y applying new
technologies
Share channel trans#ission3ast Scheduling
Shorter TT 3ast retrans#ission and so"t
co#!ination
4ink Adaptive Per#itting High order #odulation
HSDPA High Perforance Price !atioHSDPA High Perforance Price !atio
Downlink peak rate of single cell: "4#4$%p&
Multi-user share of single cell, with 230
users in theory
Low cost : Small moification to !""
Goo' technical
e(ol)tion of *CD$A !
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(
HSPDS&H Physical &hannel Structure
HSPDS&H can use 1PS or 6,1A' #odulation0 ' is the !it represented !y each
#odulation sy#!ol0 3or e7a#ple$ '82 stands "or 1PS and '8/ stands "or 6,1A'0
All layer6 signaling are trans#itted !y a""iliated HSS&&H0 HSPDS&H doesn9t carry any
layer 6 signaling0
Slot #0 Slot#1 Slot #2
T slot = 2560 chips, M*10*2 bits (k=4)
Data N data 1 bits
1 HS !DS"H sb$%a&' T = 2 &s
HS+PDSCH ,rae ,orat
Ph-&ical Channel Slot ,orat
Slot "or#at 6&hannel
;itRate
&hannel
Sy#!ol RateS3
;it.HSDS&H Su!
"ra#e;its.Slot < data
+=1PS> /?+k!ps 2/+k!ps 6, -,+ (2+ (2+
6=6,1A'> -,+k!ps 2/+k!ps 6, 6-2+ ,/+ ,/+
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Agenda
HSDPA Theor-
HSDPA Ph-&ical .a-er
HSDPA /e- Technologie&
HSDPA !!$
HSDPA E(ol)tion
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5
HSDPA ntroduced ey Technologies
A$C ,a&t Sche')ling
"1A$,ie' S," 2& &hort frae
Share' channelHA!1
" 2
3 4
① #opt 2ms short frame, fi$e S%, &DM
an 'DM (etween the users at the
same time
② )ntrouce *+#M high orer
moulation, proiing higher
moulation efficiency
③ #M' makes the ata transport well
aaptie to the changes of raio
channels
④ %ast scheuling makes multi-user
share the raio resource.
⑤ /#! uickly a1ust the channel rate
accoring to the status of raio link
an achiee the error correction anretransmission of the ata.
⑥ Share channel makes the num(er of
access users not limite (y the coe
resources.
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,
ey Technology 6
2#s radio "ra#e
Share channel resources are dyna#ically assigned in every
2#s TT HAR1 "ast "eed!ack retrans#ission !ased on 2#s TT
2#s TT #akes scheduling response #uch "aster and in ti#e
"0 &
20 &
40 &
50 &
Earlier relea&e&
2 &
!el 6HS+PDSCH HS+SCCH HS+DPCCH
8&)%+frae&9 620 chip&:&lot 3Slot&
Standard Frame length Channel feedback delay Remark
R-- 6+#s @6++#sScheduling feedback is in
RNC
HSDPA ms !ms ( "#! Slots )Continuous feedback
supported$ R! still support
the %&ms frame of R''
Decrea&e the loop tie effecti(el- ipro(e the lin; a'apti(e a%ilit- highl-
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ey Technology 2
6,1A'
HSDPA 'odulation
1PS
6,1A'
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ey Technology 5
HAR1
A C /
A C /
rong acket #rong acket #
acket #acket #
acket #acket #
rong acket #*rong acket #*
acket #*acket #*
acket #2acket #2
acket #*acket #*
acket #acket #
Drop )'s'%*'d
,)ll
!etran&i&&ion
Only retransmit
redundant info
Soft
Combination
< A C /
< A C /
acket 4acket 4acket 4acket 4
<o'e = UE <o'e = UE
acket #2acket #2
Tra'itional A!1 retran&i&&ion
echani& in!<C
.o> efficenc- long 'ela-
HA!1 retran&i&&ion echani& in <o'e =
High efficenc- &hort 'ela-
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ey Technology ,
Shared &hannel
5ser* 5ser2 5ser3
DCH"
DCH2
DCH3
Share'
HS+DSCH
U$TS
!??
HSDPA
Sae for 6ther 5sers
8Share' fat+pipe9
*0ms
&&) 7 2ms Tie$)ltipleing
Co'e $)ltipleing
De'icate'
TT@ Tran&i&&ion Tie @nter(al
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&o#parison o" HSDPA and R--.R/
te# R-- HSDPA
&apacity ( '!ps ) 20,?? 6/0/
3reBuency spectru#
e""iciency =k!it.='H)C&ell>>5(0, 2-502
Handover Hard handover . So"t handover .
So"ter handover . ntersyste# handover =to GS'>Hard handover in HSPDS&H
Power &ontrol pen loop . &lose loop . e7ternal loop
3ast speed. 4ow speed
4ow speed power control or no power
control in HSPDS&H
'odulation 1PS 1PS ; 6,1A'
4ink Adaptive 3ast power control. so"t handover A'& 、 HAR1 、 short "ra#e and "ast
channel "eed!ack
;it Scra#!le and Descra#!le <.A nly used in HSPDS&H
'A&hs <.A Esed "or "ast scheduling
/SD#
/SD# is to a1ust ata rate
accoring to channel conition when
ensuring the power
( Con&tant po>er , Changing
'ata rate )
!""8!9
!""8!9 is to a1ust power accoring
to channel conition when ensuring
serice rate
( Con&tant 'ata rate changing
po>er )
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R<& Radio Resource 'anage#ent Su##ary
'oe resource management
/SD#
channeliation
coe
/SD#
scram(ling coe
ower resource management
/SD# total power
resource management
Serice amount measurement8
Deicate measurement
Dynamic raio carrier control
'hannel
#ssignment
'hannel
/anoer
#ccess control
D'/channeliation coe
'hannel
/anoer
Mo(ile management
'ongestion control
Loa control
/anoer
measurement
ower control
hysical channel power control
Loa (alance
Deicate
measurement
!9
'ommon
Measurement
/SD#
'ommon
Measurement
#ssignment of /SD#
resource for each cell
5ser resource assignment
an management
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Power &ontrol
/SD# hysical control inclues: /S-DS'/, /S-S''/ an /S-D''/ :
/S-DS'/
ower control
/S-S''/ower control
/S-D''/
ower control
Support open loop power control, configuration
Measurement ower 6ffset
Support open loop an internal loop power control/S-S''/ ower 6ffset can (e ynamically a1uste
Support open loop an internal loop power control, configuration
∆ #'; ,∆<#'; an ∆') , an can (e ynamically a1uste accoring
to link status
HS-PDSCH and HS-SCCH dynamically adjust HS-PDSCH and HS-SCCH total power accordin
to t!e resource occupancy o" system e#cludin HS-PDSCH and HS-SCCH$
%or HS-DPCCH& its transmission power is determined 'y DPCCH$ () determine t!e
transmission power o" HS-DPCCH accordin to ain "actor βHS$
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Access &ontrol
4ecause /S-DS'/ physical channel is share resource, access control of /SD# is ifferent than the access control
of eicate channel.
During the access control, the characteristics of streaming, interactie, (ackgroun serices an the working feature of
/S-DS'/ must (e fully consiere. &he high spee feature of /S-DS'/ share channel must (e fully eelope
uring the access control.
/ S
D #
# c c e s
s c on t r ol
5= support /SD#
<um(er of /SD# user
ower resource
Data throughput carrie (y /SD#
D'/ channeliationcoe resource
# c c e s s
D e c i s i on
<oe 4 support /SD#
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Dyna#ic Radio &arrier
' h ann el
#
s s i gnm en t
'S real time serice
S non-real time serice
S real time serice
'hoose D'/
refer %#'/ an /S-DS'/
'hoose %#'/ an D'/
'hoose D'/ an /S-DS'/
Cell &)pport HSDPA
Cell 'oe& not &)pport HSDPA
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HSDPA &hannel Handover
/SD# hanoer inclues serice cell change an channel
hanoer of /S-DS'/
Sae freB)enc- &er(ice cell change %et>een <o'e =
%irst release the /S-DS'/ resource of the ol cell of source <oe 4, then
esta(lish the same /S-DS'/ resource as ol cell in the new cell of &arget
<oe 4.
'orrespon to perform har hanoer for /S-DS'/. &he /S-DS'/ transport
channel an raio carrier parameter o not change uring the hanoer
proceure.
5= e$ecute reassignment of physical channels. hen the reassignment of
physical channel is ali, M#'-hs entity of 5= nees to (e reset an 5=
oesn>t receie /SD# serice channel.
&he ali time of physical channel reassignment of 5= correspons to the ali
time of raio link reassignment of <oe 4. #t the ali time, the M#'-hs entity
of Source <oe 4 releases an the M#'-hs entity of &arget <oe 4 esta(lish.
&he two <oe 4s are not transmitting at this time. So the serice is interrupte
instantaneously uring the reassignment time.
Sae freB)enc- &er(ice cell
change in&i'e <o'e =
Similar with the change of same
freuency serice cell insie
<oe 4
&he ifference is that only one
<oe 4 are controlling. &hus
M#'-hs entity of <oe 4 oes
not change an M#'-hs entity of
5= oes not nee to (e reset.
4ut the serice is interrupte at
the ali time of physical channel
reassignment.
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&hannel Handover Trans"er 3igure
*. &raffic &rigger
2. &ransmission ower &rigger
3. 'ongestion &rigger
DCH
,ACH
HS+DSCH
PCH
*. &raffic &rigger
2. Moement &rigger
*. &raffic &rigger
2. Moement &rigger
* .& r af f i c & r i g g er
* .& r af f i c & r i g g
er
2 . ' on g e s t i on& r i g g er
* .& r af f i c & r i g g er
2 .L o a & r i g g er
* .& r af f i c & r i g g er
3 . ' on g e s t i on& r i g g er
*. &raffic &rigger
*. &raffic &rigger
* . & r
a f f i c
& r i g
g e r
2 . ' o n
g e s t i o
n & r i g
g e r
* . & r
a f f i c
& r i g
g e r
2 . L o
a & r i g
g e r
* . & r a f f i c &
r i g g e r
* . & r a f f i c &
r i g g e r
HSDS&H D&H
HSDS&H 3A&H
HSDS&H P&H
D&H D&H
D&H 3A&H
3A&H P&H
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HSDPA &ongestion &ontrol
HSDPA congestion control #eans how to #itigate resource congestion under the condition o" HSDPA
syste# resource congestion0
The resource o" HSDPA is shared and utili)ed in the #a7i#u#0 Thus the #ethod o" congestion control isslightly di""erent "ro# R-- cell0 HSDS&H resource congestion includes:
Power resource congestion
4i#ited HSDS&H tra""ic
Data through congestion
&ode resource congestion o" acco#panying DP&H
channeli)ation code
Conge&tion control etho'
of HSDPA 6ccupy in aance : hen resource is congeste, the high-priority user can occupy the resource in aance from the
low-priority user. )t guarantees high-priority user can (e always assigne resources.
ueue : &he users who has no a(ility to occupy in aance (ut has the ueue a(ility can (e put into the ueue an try
to access the resource again.
Decrease loa : &he policy of ecreasing loa is ecreasing the spee. &hat is to ecrease the rate of users who has
high (ackgroun or interactie serices for spare resources
/SD# resource a1ustment : #1ust the coe resource or power resource of /SD# to meet the reuirements of
users
! e s o ur c e
c on g e s t i on
6ccupy
in aance
ueue
Decrease
loa
/SD#
resource
a1ustment
) m pr o- e c al l s u c c e s s r a t e ,
) n c r e a s e s y s
t em c a p a c i t y
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HSDPA 4oad &ontrol
Decrease usa!le power o" HSDPA: ts ulti#ate goal is decreasing the PS data throughput0
Decrease PS data throughput : Decrease the PS data rate on D&H0
Delete #acro diversity link : Decrease the radio link o" overload cell to decrease the load0 3orced handover to another carrier or GS' syste# : nter"reBuency handover and
intersyste# handover can !e used as the #ethod "or load trans"er to decrease the load o"
overload cell0
3orce so#e lowpriority users to drop their calls0
&he goal of loa control is to guarantee the system sta(ility.
)f the system is appropriately planne, then the access control
an packet scheuling can aoi the oerloa of the resources
(ut can not aoi the situation that the system is oerloa
inuce (y suenly user power increasing when the wireless
enironment is eteriorate. &hus raio resource management
nees to aopt loa control to let the system to (e sta(le.
%or the loa control, the ifference (etween /SD# an !"" is only
at the ownlink. &hus only the ownlink loa control metho is
escri(e here. &he policy of ecreasing loa inclues :
+ * ' % l o a d
D'c%'as' o*'%all po,'% o$
HSD!-
D'c%'as' !S data th%o#.hp#t
D'l't' &ac%o di*'%sit/ li0k
o%c'd ha0do*'%
2 0 s #% ' t h ' s / s t ' &
s t a b i l i t /
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n"luence o" HSDPA to R-- RR' Algorith#
4y introucing /SD#, the relate /SD# physical channels are
ae. &hus !"" !MM algorithm is neee to (e upgrae : # special hanling of /S-DS'/ an /S-S''/ coe resource
management
# access control metho of /S-DS'/
# power control metho of /SD#
# ynamic raio carrier control policy after introucing /S-DS'/
&he introucing of /SD# cell an hanoer characteristics of /SD#
physical channel affect the mo(ile hanoer ecision policy an hanling.
# loa (alancing characteristics for cells. #ffect the selection of loa
(alance estination cell an later hanling, eg., accompanying the transfer
(etween /S-DS'/ an D'/
5pate in congestion control
5pate in loa control
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Agenda
HSDPA Theor-
HSDPA Ph-&ical .a-er
HSDPA /e- Technologie&
HSDPA !!$
HSDPA E(ol)tion
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'o!ile &o##unication Develop#ent
Mo(ile communication is eelope from 2?@3?@3."?. )t is
eelope from mo(ile oice serice to high spee ata serice. 'urrently it is eelope to 3.A?. %or 'DM#, commercial !A
ersion an trial !+ ersion can (e proie now.
3? is working on the stanars of !B8/S#C an !8L&=. )t is
estimate that !B will (e finalie on 200B an ! will (e finalie on
200.
&he eelopment of raio technology pays more attention to the
reuirement of operator E <?M< organiation propose the system
eelopment goal.
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'o!ile &o##unication Technology Fvolution
2? 2.A? 3? 3.A? 3.BA? 3."?2.BA?
?SM'DM#
!""?!S
=D?=
/SD# /S5#
/S#C
L&=
)S-"A'DM#2000
*F =G-D6
'DM#
2000 *F
=G-D6
!e. #
=G-D6
!e. 4 #)=
'DM#2000
*F =G-DG
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%&D'A Road#ap
?SM?!S8=D?=
3?
!""
3?C/SD#Downlink
=nhance
3?
/SD#8/S5
#Downlink85plink
=nhance
?SMH?!S8=D?=I
3?
=nhance 5M&S
6ptimie 5M&S
<?M<
<?M< ( L&=,
J )4roa(an raio
) (ase wie(an
eer to eer
2002+3 2003+4 200+ 2007+? After 200? ear
D.
thro)ghp)t
4+"44;%p& 4+354;%p& 354;%p&+4$%p& 354;%p&+7$%p& 20+0$%p&