EE
TS
8316
Wirele
ss
Netw
ork
sF
all
2013
Shanta
nu K
angude
skangude@
lyle
.sm
u.e
du
Lectu
re:
LT
E S
chedulin
g a
nd D
RX
htt
p:/
/lyle
.sm
u.e
du/~
skangude/e
ets
8316.h
tml
Schedulin
g&
Rate
Contr
ol
Schedule
r opera
tion
Sig
nalli
ng o
f schedule
r decis
ions
Measure
ments
to s
upport
schedule
r opera
tion
UL
MA
CS
chedulin
gat
the
UE
D
ete
rmin
es w
hic
h b
eare
rs g
et how
much o
f
the a
llocation a
t th
e U
E
E
ssentially
within
-UE
schedulin
g
W
ork
s o
n g
rants
receiv
ed f
rom
the e
NB
S
imple
r th
an t
he e
NB
based s
chedulin
g
M
AC
tells
RLC
to s
end X
i bits f
rom
logic
al
channel i
S
chedule
r based o
n B
eare
rs Q
oS
requirem
ents
MA
CS
chedulin
gat
the
eN
B
Sig
nific
antly m
ore
com
ple
x t
han a
t U
E
eN
B c
ontr
ols
channe
l usage in b
oth
UL
& D
L
F
acto
rs a
ffecting s
ch
edulin
g
Tra
ffic
volu
me f
or
each b
eare
r at
each U
E
Schedule
UE
s w
ith b
eare
rs h
avin
g b
acklo
g
Q
oS
Requirem
ents
of
each b
eare
r at
each U
E
Priority
Schedule
, as w
ell
as a
llocate
resourc
es in p
roport
ion t
o
QoS
guara
nte
es
R
adio
conditio
ns a
t U
Es
Id
entified t
hro
ugh
M
easure
ments
made a
t th
e e
NB
, and/o
r
M
easure
ments
report
ed b
y t
he U
E
S
chedule
radio
resourc
es a
s p
er
good r
adio
conditio
ns f
or
UE
s
Radio
Resourc
eA
llocations
D
escribed b
y
R
esourc
e B
lock L
ocations
M
odula
tion a
nd
Codin
g S
che
me
C
an b
e v
alid
for
1 T
ransm
it T
ime I
nte
rval (T
TI)
or
Subfr
am
e
Longer
than 1
TT
I
R
equire a
dditio
nal in
form
ation a
llocation t
ime,
allo
cation r
epetition f
acto
r etc
. to
specify
A
lso c
alle
d S
em
i-P
ers
iste
nt
Sch
ed
uli
ng
Pers
iste
nt
Allo
cations?
T
ypic
al 1 T
TI
allo
cations a
re f
or
1 s
ubfr
am
e o
nly
S
uitable
for
burs
ty, unpre
dic
table
, and d
ow
nlo
ad type o
f tr
aff
ic
E
very
new
allo
cation n
eeds indic
ation a
nd c
hannel capacity u
sa
ge
on P
DC
CH
W
hat
if a
n identical allo
cation n
eeds t
o b
e d
one
periodic
ally
?
Som
e b
eare
rs, lik
e f
or
VO
IP, are
periodic
A
nd e
very
packet carr
ies identical am
ount of
data
A
llocation p
att
ern
and s
ize is D
ET
ER
MIN
IST
IC
W
hat
if t
he a
llocation o
verh
ead in P
DC
CH
per
data
octe
t tr
ansfe
rred is A
LS
O h
igh?
V
OIP
exam
ple
: P
ackets
are
sm
all,
and h
appen e
very
20 m
s f
or
a
dete
rmin
istic p
att
ern
and s
ize o
f allo
cation
E
ffic
ien
cy S
olu
tio
n:
All
ocate
on
ce f
or
peri
od
ic
reso
urc
es =
Pers
iste
nt
All
ocati
on
Challe
nges
with
Pers
iste
nt
Allo
cations
R
esourc
e B
lock C
hann
el C
onditio
ns C
hange
A
llocate
d f
requency c
arr
iers
may c
hange t
o h
ave w
ors
e
channel conditio
ns t
han o
ther
Resourc
e B
locks (
RB
s)
M
ay n
eed to m
ove t
he R
B location
M
ay n
eed t
o a
lter
periodic
ity o
f a p
ers
iste
nt
allo
cation o
ver
tim
e
E.g
. V
OIP
sile
nce p
eriods n
eed t
ransm
issio
ns less o
ften
than t
alk
periods
M
ay n
eed t
o s
uspe
nd o
r pause p
ers
iste
nt
allo
cations
Pers
iste
nt
all
ocati
on
s w
ith
th
e a
bo
ve c
han
ges
all
ow
ed
= S
em
i-p
ers
iste
nt
all
ocati
on
s
Dow
nlin
kA
llocations
by
the
eN
B
Dynam
ic a
llocations (
Regula
r allo
cations)
O
n P
DC
CH
for
usage o
f P
DS
CH
P
hysic
al R
B a
nd M
odula
tion C
odin
g S
chem
e
S
em
i-pers
iste
nt
allo
cations
O
nly
for
the f
irst
HA
RQ
tra
nsm
issio
nof
packets
(of
cours
e,
ReT
xs a
re u
npre
dic
table
)
R
RC
defines t
he p
eriodic
ity o
f th
e s
em
i-pers
iste
nt
dow
nlin
k g
rant
P
DC
CH
indic
ate
s w
heth
er
the d
ow
nlin
k g
rant
is a
sem
i-pers
iste
nt
one i.e
. w
heth
er
it c
an b
e im
plic
itly
reused in t
he
follo
win
g T
TIs
accord
ing t
o t
he p
eriodic
ity d
efined b
y R
RC
When n
eeded,
HA
RQ
RE
TX
alw
ays e
xplic
itly
sig
nale
d
via
PD
CC
H
Dow
nlin
kD
ata
:P
DC
CH
-Sem
i-
pers
iste
nt
Inte
ractions
C
ore
concept
PD
CC
H a
lways o
verr
ides s
em
i-
pers
iste
nt
allo
cations
In
the s
ub-f
ram
es w
here
the U
E h
as s
em
ipers
iste
nt
dow
nlin
k r
esourc
e,
if t
he U
E c
annot
find its
C-R
NT
I on
the P
DC
CH
(s),
a d
ow
nlin
k t
ransm
issio
n a
ccord
ing t
o t
he
sem
i-pers
iste
nt
allo
cation t
hat
the U
E h
as b
een a
ssig
ned
in t
he T
TI
is a
ssum
ed
In
sub-f
ram
es w
here
the U
E h
as s
em
i-pers
iste
nt
dow
nlin
k r
esourc
e,
if t
he U
E f
inds its
C-R
NT
I on t
he
PD
CC
H(s
), t
he P
DC
CH
allo
cation o
verr
ides t
he s
em
i-
pers
iste
nt
allo
cation f
or
that
TT
I and t
he U
E d
oes n
ot
decode t
he s
em
i-pers
iste
nt
resourc
es
Uplin
kA
llocations
by
the
eN
B
D
ynam
ic A
llocations (
Regula
r)
Id
entical to
DL d
ynam
ic a
llocation
s
D
one in P
DC
CH
with P
RB
location a
nd M
CS
S
em
i-pers
iste
nt A
llocations (
sim
ilar
to t
he
DL v
ers
ion)
R
RC
defines p
eri
odic
ity
P
DC
CH
indic
ate
s if
the a
llocation is s
em
i-pers
iste
nt
or
not
O
ne d
iffe
rence f
rom
DL:
HA
RQ
for
UL is
Synchro
nous =
> e
ven a
llocatio
ns f
or
retr
ansm
issio
ns c
an b
e I
MP
LIC
IT
Uplin
kD
ata
:P
DC
CH
,S
em
i-pers
iste
nt,
and
Synchro
nous
HA
RQ
Inte
ractions
C
ore
concept:
PD
CC
H a
lways o
verr
ides
In
sub-f
ram
es w
here
UE
has s
em
i-pers
iste
nt U
L r
esourc
e,
if it
cannot
find its
C-R
NT
I on t
he P
DC
CH
(s),
a U
L T
X a
ccord
ing to
the s
em
i-pers
iste
nt allo
cation t
hat
the U
E h
as b
een a
ssig
ned in
the T
TI
can b
e m
ade.
N/W
perf
orm
s d
ecodin
g o
f th
e p
re-d
efine
d
PR
Bs a
ccord
ing t
o the p
re-d
efined M
CS
In
sub-f
ram
es w
here
UE
has s
em
i-pers
iste
nt U
L r
esourc
e,
if it
finds its
C-R
NT
I on t
he P
DC
CH
(s),
the P
DC
CH
allo
cation
overr
ides the p
ers
iste
nt
allo
cation for
that
TT
I and t
he U
Es
TX
follo
ws t
he P
DC
CH
allo
cation,
not
the s
em
ipers
iste
nt
R
eT
xs a
re e
ither
implic
itly
allo
cate
d in w
hic
h c
ase t
he U
E u
ses
the s
em
i-pers
iste
nt uplin
k a
llocation,
or
explic
itly
allo
cate
d v
ia
PD
CC
H(s
) in
whic
h c
ase the U
E d
oes n
ot
follo
w t
he s
em
i-
pers
iste
nt
allo
cation
Measure
ments
toS
upport
Schedulin
g
M
easure
ment re
port
s r
equired fro
m t
he U
E
to s
upport
both
UL a
nd D
L s
chedulin
g b
y
eN
B
T
raff
ic V
olu
me
U
plin
k b
uff
er
sta
tus r
eport
s (
BS
R)
are
needed t
o
pro
vid
e s
upport
for
QoS
-aw
are
packet
schedulin
g
C
hannel conditio
ns a
t variou
s c
arr
iers
C
QI
report
ing f
or
schedulin
g
Buff
er
Sta
tus
Report
s&
Logic
al
ChannelG
oru
ps
T
raff
ic v
olu
me is r
eport
ed in B
uff
er
Sta
tus R
eport
s
(BS
Rs)
T
o s
implif
y B
SR
s,
logic
al channels
are
gro
uped in
to
4 l
og
ical
ch
an
nel
gro
up
s (
LC
G)
R
eport
ing is a
ggre
gate
on e
ach L
CG
E
xam
ple
A
ll w
eb a
nd f
tp c
an b
e in 1
gro
up
A
ll contr
ol and h
igh p
riority
VO
IP in a
noth
er
gro
up
2 f
orm
ats
for
BS
Rs
S
hort
form
at:
Only
1 L
CG
report
ed (
any 1
)
Long f
orm
at:
All
4 L
CG
s r
eport
ed
B
SR
s a
re s
ent
usin
g M
AC
Sig
nalin
g (
as a
gain
st
RR
C s
ignalin
g)
CQ
IR
eport
ing
C
hannel Q
ualit
y I
ndic
ato
r (C
QI)
rep
ort
s indic
ate
the c
onditio
ns a
s s
een in t
he D
L b
y t
he U
E
C
QI
report
s c
an b
e c
onfigure
d t
o b
e s
ent
P
eriodic
, an
d/o
r
A
periodic
C
QI
report
ing is c
on
figure
d b
y t
he
eN
B,
whic
h
assig
ns t
ime/f
requen
cy r
esourc
es f
or
transm
issio
n
If
both
Aperiodic
and P
eriodic
report
schedule
d f
or
the
sam
e s
ubfr
am
e
ON
LY
Aperiodic
one is s
ent
3 t
ypes
W
ideb
an
d,
Mu
ltib
an
d, an
d M
IMO
CQ
I re
po
rt t
yp
es
Periodic
and
Aperiodic
CQ
IR
eport
s
A
periodic
T
he r
eport
is s
chedule
d b
y t
he e
NB
via
the P
DC
CH
T
ransm
itte
d t
ogeth
er
with u
plin
k d
ata
on P
US
CH
P
eriodic
W
hen t
he U
E is a
llocate
d P
US
CH
resourc
es in a
subfr
am
e w
here
a p
eriodic
CQ
I re
port
is c
onfigure
d t
o b
e
sent,
the p
eriodic
CQ
I re
port
is t
ransm
itte
d t
ogeth
er
with
uplin
k d
ata
on t
he P
US
CH
O
therw
ise,
the p
eriodic
CQ
I re
port
s a
re s
ent
on t
he
PU
CC
H
Core
concept:
Try
th
e b
est
to s
end a
ll re
port
s o
n
PU
SC
H
if
not
possib
le,
use P
UC
CH
N
ote
: S
ize a
nd F
orm
at
depends o
n w
heth
er
Aperiodic
/Periodic
an
d w
heth
er
on P
UC
CH
/PU
SC
H
DR
X
A g
ood r
efe
rence a
t:htt
p:/
/ww
w.s
hare
technote
.com
/htm
l/M
AC
_LT
E.h
tml#
DR
X
Follo
win
g f
igure
s a
re s
ourc
ed f
rom
the a
bove U
RL
Dis
continuous
Reception
(DR
X)
N
orm
ally
UE
requir
ed t
o r
ead P
DC
CH
for
allo
cations
in A
LL S
UB
FR
AM
ES
D
RX
is a
pow
ers
ave m
echanis
m w
ith
A
vaila
ble
-Unavaila
ble
RX
cycle
s/p
eriods
Lik
e D
oze/A
wake P
eri
ods in W
ifi P
ow
ers
ave
C
an h
appen in b
oth
RR
C s
tate
s
In R
RC
_ID
LE
: Longer
unavaila
ble
periods,
and p
agin
g
done w
hen
availa
ble
In
RR
C_
CO
NN
EC
TE
D:
Typic
ally
short
er
unavaila
ble
periods,
and C
RN
TI
based r
egula
r allo
cations w
hen
availa
ble
N
o s
pecia
l R
RC
or
MA
C s
tate
s d
esig
na
ted f
or
DR
X
P
er
UE
mechanis
m (
as o
pposed t
o p
er
beare
r)
DR
XD
efinitio
ns
(1/2
)
O
n-d
ura
tio
n:
Dura
tion
in d
ow
nlin
k s
ubfr
am
es t
hat
the U
E w
aits f
or,
aft
er
wakin
g u
p f
rom
DR
X,
to
receiv
e P
DC
CH
s.
If t
he U
E s
uccessfu
lly d
ecod
es a
PD
CC
H,
the U
E s
tays a
wake a
nd s
tart
s t
he inactivity
tim
er
In
acti
vit
y-t
imer:
Dura
tion
in d
ow
nlin
k s
ubfr
am
es t
hat
the U
E w
aits t
o s
uccessfu
lly d
ecode a
PD
CC
H,
from
the last
successfu
l decodin
g o
f a P
DC
CH
, fa
iling
whic
h it
re-e
nte
rs D
RX
. T
he U
E s
hall
resta
rt t
he
inactivity t
imer
follo
win
g a
sin
gle
successfu
l decod
ing
of
a P
DC
CH
for
a f
irst
transm
issio
n o
nly
(i.e.
not
for
retr
ansm
issio
ns)
DR
XB
asic
s
DR
XD
efinitio
ns
(2/2
)
D
RX
Cycle
:T
he d
ura
tion
of
one 'O
N t
ime' +
one
'OF
F t
ime
sh
ort
DR
X-C
ycle
:D
RX
cycle
whic
h c
an b
e
imple
mente
d w
ith
in t
he 'O
FF
' peri
od o
f a long D
RX
Cycle
T
ypic
ally
a f
ew
short
cycle
s m
ay b
e s
et
aft
er
on
tim
e o
f a
long D
RX
cycle
Just
so t
hat
we g
o t
o t
he long
off
period o
nly
aft
er
testing
the w
ate
rs
with n
o a
ctivity in t
he s
hort
DR
X c
ycle
s
d
rxS
ho
rtC
ycle
Tim
er:
The c
onsecu
tive n
um
ber
of
subfr
am
es t
he U
E s
hall
follo
w t
he s
hort
DR
X c
ycle
aft
er
the D
RX
Inactivity T
imer
has e
xpired
DR
XLong
and
Short
Cycle
s
DR
X S
hort
Cycle
s a
re O
ptional, a
nd n
eed t
o b
e c
onfigure
d;
NO
RM
AL D
RX
is t
he L
ON
G D
RX
Forc
ing
UE
toth
eO
ff
Sta
teby
DR
X
Com
mand
MA
CC
ontr
olE
lem
ent
Active
Tim
e
A
cti
ve-t
ime:
Tota
l dura
tion t
hat
the U
E is
aw
ake.
This
inclu
des t
he
O
n-d
ura
tion
of
the D
RX
cycle
T
he t
ime U
E is p
erf
orm
ing c
ontinu
ous r
eception
w
hile
the inactivity t
imer
has n
ot
expired
T
he t
ime U
E is p
erf
orm
ing c
ontinu
ous r
eception
w
hile
waitin
g f
or
a D
L r
etr
ansm
issio
n a
fter
one
HA
RQ
RT
T
M
inim
um
active tim
e is o
f le
ngth
equal to
on-
dura
tion
M
axim
um
is u
ndefined (
infinite)
Sum
mary
U
L a
nd D
L S
chedulin
g in L
TE
S
em
i-pers
iste
nt S
chedulin
g
D
RX