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3GPP UMTS Long Term EvolutionU link ower control in LTE
August 2009
Andreas Roessler
Andreas.Roessler@rohde-schwarz.com
Technology Manager North America
Rohde & Schwarz German ,
sca mer
This presentation contains forward looking statements and milestones. Such statements are based on our current
expectations and are subject to certain risks and uncertainties that could negatively affect our delivery roadmap.
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2
Uplink power controlWhat's behind?
sufficient Ebit /N0 to
achieve required QoS
uplink interference,
maximize battery life
l Characteristic of radio channel with multipath propagation (path loss,
shadowing, fast fading) as well as the interference “provided” through other users – both within the same cell and from neighboring cells – needs to be
August ‘09 | UL power control in LTE | 2
,
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Some comments on UL power control in LTE…or in other words what is different to 3G (UTRA FDD = WCDMA)?
l SC-FDMA is the UL transmission scheme, so transmission of
different UE’s in the same radio cell is (almost) orthogonal by
nature, means intra-cell interference is less critical than in WCDMA, – n ata rate s ncrease y ower ng t e sprea ng actor ncreas ng t e
transmission power increase of intra-cell interference,
– In LTE data rate is increased by varying the allocated bandwidth and the
Modulation Coding Scheme (MCS), where the power can remain typically the same
, …,
l WCDMA uses periodic power control (0.667ms) normally with a
step size of ±1 dB (“fast power control”), where LTE allows larger
power steps, ut not necessar y per o ca y,
– LTE uses a combination of open-loop and close-loop for UL power control, as this
is more affordable and requires less feedback (signaling overhead) than WCDMA, – Open-loop is used to set a coarse operating point, where close-loop will be used for
August ‘09 | UL power control in LTE | 3
ne un ng o con ro n er erence an ma c c anne con ons,
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What is power controlled in the uplink?Physical channels and signals in the uplink
Path loss
UL interference
Multipath propagation
Physical UplinkPhysical Uplink
Shared Channel (PUSCH)Control Channel (PUCCH)(Demodulation Reference Signal,over entire bandwidth in time slots #3 and #10)
(Demodulation Reference Signal,occupied time slot position depends
Sounding Reference Signals (SRS)
[optional]
August ‘09 | UL power control in LTE | 4
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Physical channels and signals in the uplinkPUSCH, PUCCH, DMRS, SRS in the time-frequency domain
Demodulation Reference
Signals (DMRS)for PUSCH and PUCCH
Physical Uplink Control Channel (PUCCH)issued by UE3 and UE4
Time1 subframe (1 ms) = 2 Time Slots
7 SC-FDMA symbols
(normal cyclic prefix)
Physical Uplink
Shared Channel
(PUSCH)used by UE1 and UE2
Sounding
Reference
Signals (SRS)issued by UE1 and UE2
Slot #0 Slot #1 Slot #2 Slot #3
Frequency
e.g. 50 RB = 10 MHz
channel bandwidth
August ‘09 | UL power control in LTE | 5
Screenshot taken from R&S® SMU200A Vector Signal Generator
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PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
August ‘09 | UL power control in LTE | 6
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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7
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
Transmit power for PUSCH
in subframe i in dBm
August ‘09 | UL power control in LTE | 7
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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8
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Transmit power for PUSCH
in subframe i in dBm
August ‘09 | UL power control in LTE | 8
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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9
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Number of allocated
resource blocks (RB)
Transmit power for PUSCH
in subframe i in dBm
August ‘09 | UL power control in LTE | 9
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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10
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
Number of allocated
resource blocks (RB)
Transmit power for PUSCH
in subframe i in dBm
August ‘09 | UL power control in LTE | 10
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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11
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
Number of allocated
resource blocks (RB)Cell-specific
parameter
confi ured b L3Transmit power for PUSCH
in subframe i in dBm
August ‘09 | UL power control in LTE | 11
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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12
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
Number of allocated
resource blocks (RB)Cell-specific
parameter
confi ured b L3Transmit power for PUSCH
Downlink
path loss
estimate in subframe i in dBm
August ‘09 | UL power control in LTE | 12
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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13
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
PUSCH transport
format
Number of allocated
resource blocks (RB)Cell-specific
parameter
confi ured b L3Transmit power for PUSCH
Downlink
path loss
estimate in subframe i in dBm
August ‘09 | UL power control in LTE | 13
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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14
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
PUSCH transport
format
Number of allocated
resource blocks (RB)Cell-specific
parameter
confi ured b L3Transmit power for PUSCH
Power control
adjustment derived
from TPC command
Downlink
path loss
estimate in subframe i in dBm received in subframe (i-4)
August ‘09 | UL power control in LTE | 14
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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15
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
PUSCH transport
format
Number of allocated
resource blocks (RB)Cell-specific
parameter
confi ured b L3Transmit power for PUSCH
Power control
adjustment derived
from TPC command
Downlink
path loss
estimate in subframe i in dBm received in subframe (i-4)
August ‘09 | UL power control in LTE | 15
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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16
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
PUSCH transport
format
Number of allocated
resource blocks (RB)Cell-specific
parameter
confi ured b L3Transmit power for PUSCH
Power control
adjustment derived
from TPC command
Downlink
path loss
estimate
-
in subframe i in dBm received in subframe (i-4)
August ‘09 | UL power control in LTE | 16
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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17
PUSCH power controlPhysical Uplink Shared Channel
l Power level [dBm] of PUSCH is calculated every subframe i based on the
following formula out of TS 36.213 V8.7.0 (June ’09 baseline),
ax mum a owe power
in this particular cell,
but at maximum +23 dBm1)
Combination of cell- and UE-specific
components configured by L3
PUSCH transport
format
Number of allocated
resource blocks (RB)Cell-specific
parameter
confi ured b L3Transmit power for PUSCH
Power control
adjustment derived
from TPC command
Downlink
path loss
estimate
-
in subframe i in dBm received in subframe (i-4)
August ‘09 | UL power control in LTE | 17
1) +23 dBm is maximum allowed power in LTE according to TS 36.101, corresponding to power class 3bis in WCDMA
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PUSCH power controlPCMAX
l PCMAX=min{PEMAX; PUMAX}
l PEMAX is the maximum allowed
power for this particular radio cell
corresponds to P-MAX information
element (IE) provided in SIB Type 1,
l PUMAX is the maximum UE power, defined as +23 dBm ± 2dB corresponding
,
– Based on higher order modulation schemes and used transmission bandwidth a
Maximum Power Reduction (MPR) is applied and the UE maximum transmission
power is further reduced (see TS 36.101, table 6.2.3-1),
–
August ‘09 | UL power control in LTE | 18
_
transmission power (= Additional MPR (A-MPR); see TS 36.101, Table 6.2.4-1)
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PUSCH power controlMPUSCH
l Power calculation depends also on allocated resource blocks for
uplink data transmission,
l Number of RB depends on configured bandwidth, but further not eachnum er o s a su a e a oca on,
l DCI format 0 and resource allocation type 2 is used to allocated resource
blocks to the UE
– Resource allocation type 2 means in general allocation of contiguously RB,
– Resource Indication Value (RIV) is signaled to the UE, calculated as follows:
⎣ ⎦)1(
2/)1(
UL
UL
RBCRBs
else RB L N RIV
then N L
+−=
≤−
)1()1( START
UL
RBCRBs
UL
RB
UL
RB RB N L N N RIV −−++−=
ULRB
PUSCHRB
532 532 N M ≤⋅⋅= α α α
August ‘09 | UL power control in LTE | 19
– where α2, α3 and α5 are any integer value,
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PUSCH power controlMPUSCH
l Power calculation depends also on allocated resource blocks for
uplink data transmission,
l Number of RB depends on configured bandwidth, but further not eachnum er o s a su a e a oca on,
l DCI format 0 and resource allocation type 2 is used to allocated resource
blocks to the UE
– Resource allocation type 2 means in general allocation of contiguously RB,
– Resource Indication Value (RIV) is signaled to the UE, calculated as follows:
⎣ ⎦)1(
2/)1(
UL
UL
RBCRBs
else RB L N RIV
then N L
+−=
≤−
# of allocated RB
)1()1( START
UL
RBCRBs
UL
RB
UL
RB RB N L N N RIV −−++−=
ULRB
PUSCHRB
532 532 N M ≤⋅⋅= α α α
e.g. 27 RB,…
August ‘09 | UL power control in LTE | 20
– where α2, α3 and α5 are any integer value,
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PUSCH power controlMPUSCH
l Power calculation depends also on allocated resource blocks for
uplink data transmission,
l Number of RB depends on configured bandwidth, but further not eachnum er o s a su a e a oca on,
l DCI format 0 and resource allocation type 2 is used to allocated resource
blocks to the UE
– Resource allocation type 2 means in general allocation of contiguously RB,
– Resource Indication Value (RIV) is signaled to the UE, calculated as follows:
⎣ ⎦)1(
2/)1(
UL
UL
RBCRBs
else RB L N RIV
then N L
+−=
≤−
# of allocated RB
Bandwidth,
e.g. 10 MHz = 50 RB
Offset in # of RB, e.g. 15 RB
)1()1( START
UL
RBCRBs
UL
RB
UL
RB RB N L N N RIV −−++−=
ULRB
PUSCHRB
532 532 N M ≤⋅⋅= α α α
e.g. 27 RB,…
August ‘09 | UL power control in LTE | 21
– where α2, α3 and α5 are any integer value,
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PUSCH power controlMPUSCH
l Power calculation depends also on allocated resource blocks for
uplink data transmission,
l
Number of RB depends on configured bandwidth, but further not eachnum er o s a su a e a oca on,
l DCI format 0 and resource allocation type 2 is used to allocated resource
blocks to the UE
– Resource allocation type 2 means in general allocation of contiguously RB,
– Resource Indication Value (RIV) is signaled to the UE, calculated as follows:
⎣ ⎦)1(
2/)1(
UL
UL
RBCRBs
else RB L N RIV
then N L
+−=
≤−
# of allocated RB
Bandwidth,
e.g. 10 MHz = 50 RB
Offset in # of RB, e.g. 15 RB
)1()1( START
UL
RBCRBs
UL
RB
UL
RB RB N L N N RIV −−++−=
ULRB
PUSCHRB
532 532 N M ≤⋅⋅= α α α
e.g. 27 RB,…
…must fulfill this requirement!
August ‘09 | UL power control in LTE | 22
– where α2, α3 and α5 are any integer value,
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PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1},
August ‘09 | UL power control in LTE | 23
1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1}, – P0_NOMINAL_PUSCH(j) in the range of -126…+24 dBm is used to have different BLER
operating points to achieve lower probability of retransmissions,
August ‘09 | UL power control in LTE | 24
1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1},
Full path loss compensation is considered…
.
– P0_NOMINAL_PUSCH(j) in the range of -126…+24 dBm is used to have different BLER
operating points to achieve lower probability of retransmissions,
August ‘09 | UL power control in LTE | 25
1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1},
Full path loss compensation is considered…
…no path loss compensation is used.
– P0_NOMINAL_PUSCH(j) in the range of -126…+24 dBm is used to have different BLER
operating points to achieve lower probability of retransmissions,
August ‘09 | UL power control in LTE | 26
1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1},
Full path loss compensation is considered…
…no path loss compensation is used.
– P0_NOMINAL_PUSCH(j) in the range of -126…+24 dBm is used to have different BLER
operating points to achieve lower probability of retransmissions,
– P0_UE_PUSCH(j) in the range of -8…7 dB is used by the eNB to compensate
systematic offsets in the UE’s transmission power settings arising from a wrongly
,
August ‘09 | UL power control in LTE | 27
1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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28
PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1},
Full path loss compensation is considered…
…no path loss compensation is used.
– P0_NOMINAL_PUSCH(j) in the range of -126…+24 dBm is used to have different BLER
operating points to achieve lower probability of retransmissions,
– P0_UE_PUSCH(j) in the range of -8…7 dB is used by the eNB to compensate
systematic offsets in the UE’s transmission power settings arising from a wrongly
,
l j = 0 for semi-persistent scheduling (SPS), j = 1 for dynamic scheduling,
August ‘09 | UL power control in LTE | 28
1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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29
PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1},
Full path loss compensation is considered…
…no path loss compensation is used.
– P0_NOMINAL_PUSCH(j) in the range of -126…+24 dBm is used to have different BLER
operating points to achieve lower probability of retransmissions,
– P0_UE_PUSCH(j) in the range of -8…7 dB is used by the eNB to compensate
systematic offsets in the UE’s transmission power settings arising from a wrongly
,
l j = 0 for semi-persistent scheduling (SPS), j = 1 for dynamic scheduling,l j = 2 for transmissions corresponding to the retransmission of the random
access response,
– or = : 0_UE_PUSCH = an 0_NOMINAL_PUSCH = 0_PRE + PREAMBLE_Msg3,
where P0_PRE and ∆PREAMBLE_Msg3 are provided by higher layers,
August ‘09 | UL power control in LTE | 29
1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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30
PUSCH power controlP0_PUSCH(j)
l P0_PUSCH(j) is a combination of cell- and UE-specific components,
configured by higher layers1):
l
P0_PUSCH(j) = P0_NOMINAL_PUSCH(j) + P0_UE_PUSCH(j),
j = {0, 1},
Full path loss compensation is considered…
…no path loss compensation is used.
– P0_NOMINAL_PUSCH(j) in the range of -126…+24 dBm is used to have different BLER
operating points to achieve lower probability of retransmissions,
– P0_UE_PUSCH(j) in the range of -8…7 dB is used by the eNB to compensate
systematic offsets in the UE’s transmission power settings arising from a wrongly
,
l j = 0 for semi-persistent scheduling (SPS), j = 1 for dynamic scheduling,l j = 2 for transmissions corresponding to the retransmission of the random
access response,
– or = : 0_UE_PUSCH = an 0_NOMINAL_PUSCH = 0_PRE + PREAMBLE_Msg3,
where P0_PRE and ∆PREAMBLE_Msg3 are provided by higher layers,
– P0_PRE is understood as Preamble Initial Received Target Power provided by higher layers
and is in the range of -120…-90 dBm, – ∆PREAMBLE Ms 3 is in the range of -1…6, where the signaled integer value is multiplied by 2 and
August ‘09 | UL power control in LTE | 30
_
is than the actual power value in dB,1) see next slide(s) respectively TS 36.331 V8.6.0 Radio Resource Control specification
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PUSCH power controlP0_PUSCH(j)
l UplinkPowerControl IE contains the required information about
P0_Nominal_PUSCH, P0_UE_PUSCH, ∆PREAMBLE_Msg3 are part of
RadioResourceConfigCommon,
l Via RadioResourceConfigCommon the terminal gets also access to RACH-
ConfigCommon to extract from there information like Preamble Initial
Received Target Power (P0_PRE),
l RadioResourceConfigCommon IE is part of System Information Block Type 2 (SIB Type 2),
– System information (SI) in LTE are organized in System Information Blocks and are
grouped in SI Messages when they do have same periodicity,
– In contrast to WCDMA SI are not signaled on a dedicated channel, instead the
shared channel transmission principle is used and they are transmitted on PDSCH,
– SIB Type contains at all information about shared and common channels and is
August ‘09 | UL power control in LTE | 31
,
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32
PUSCH power controlα(j) and PL
l Path loss (PL) is estimated by measuring the power level (Reference Signal
Receive Power, RSRP) of the cell-specific downlink reference signals
(DLRS) and subtracting the measured value from the transmit power level of
, – SIB Type 2 RadioResourceConfigCommon PDSCH-ConfigCommon,
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PUSCH power controlα(j) and PL
l Path loss (PL) is estimated by measuring the power level (Reference Signal
Receive Power, RSRP) of the cell-specific downlink reference signals
(DLRS) and subtracting the measured value from the transmit power level of
, – SIB Type 2 RadioResourceConfigCommon PDSCH-ConfigCommon,
l α(j) is used as path-loss compensation factor as a trade-off between total
- ,
– Full path-loss compensation maximizes fairness for cell-edge UE’s, – Partial path-loss compensation may increase total system capacity, as less
resources are spent ensuring the success of transmissions from cell-edge UEs and
- ,
– For α(j=0, 1) can be 0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0, where 0.7 or 0.8 give a close-to-
maximum system capacity by providing an acceptable cell-edge performance,
– For α(j=2) = 1.0,
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34
PUSCH power control∆TF(i)
l ∆TF(i) can be first seen as MCS-
dependent component in the power
control as it depends in the end on
number of code blocks respectively
TF 10( ) 10 log ((2 1) )S MPR K PUSCH
offset i β
⋅Δ = −
K status is signaled
by higher layers(SIB Type 2
RadioResourceConfigCommon
UplinkPowerControl ),
bits per code blocks, which translates
to a specific MCS,
l MCS the UE uses is under control of
the eNB
No?
Yes, than K=1.25
∆TF(i)=0Is K
enabled?
– ,
parameter can be understood as
another way to control the power: whenthe MCS is changed, the power will
increase or decrease, control information
without UL-SCH data
only UL-SCH dataWhat is transmitted
on PUSCH? 1
1
0
=
= ∑−
=
β PUSCH
offset
C
r
RE r N K MPR
are send instead of user data (=
“Aperiodic CQI reporting”), which is
signaled by a specific bit in the UL
scheduling grant, power offset are set
When “a-periodic CQI/PMI/RI
reporting” is configured(see TS 36.213, section 7.2.1
and TS 36.212, section 5.3.3.1.1)
OCQI Number of CQI bits incl. CRC bits
β β CQI
offset
PUSCH
offset
RE CQI N O MPR
=
=
August ‘09 | UL power control in LTE | 34
y g er ayers see nex s e , RE
C Number of code blocks,Kr Size of code block r,
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35
PUSCH power control∆TF(i), when aperiodic CQI reporting is configured
l is signaled by higher layers to the UE and is
part of the system information, 0 reserved
1 reserved
CQI
offset I CQI
offset β β CQI
offset
PUSCH-ConfigCommon,
l can take one out of 16 values in [dB]
2 1.125
3 1.250
4 1.375
5 1.625 β CQI
offset
, .
7 2.0008 2.250
9 2.500
.
11 3.125
12 3.500
13 4.000
14 5.000
August ‘09 | UL power control in LTE | 35
.
15 6.250
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36
PUSCH power controlf(i)
l f(i) is the other component of the dynamic offset, UE-specific Transmit Power
Control (TPC) commands, signaled with the uplink scheduling grant (PDCCH
DCI format 0); two modes are defined: accumulative and absolute,
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37
PUSCH power controlf(i)
l f(i) is the other component of the dynamic offset, UE-specific Transmit Power
Control (TPC) commands, signaled with the uplink scheduling grant (PDCCH
DCI format 0); two modes are defined: accumulative and absolute,
, , .
– Power step relative to previous step, comparable with close-loop power control in
WCDMA, difference available step sizes, which are δPUSCH={±1 dB or -1, 0, +1, +3
dB} for LTE, larger power steps can be achieved by combining TPC- and MCS-
dependent power control, Activated at all by dedicated RRC signaling, disabled
when minimum (-40 dBm) or maximum power (+23 dBm) is reached,
– , where K PUSCH = 4 for FDD and depends onthe UL-DL configuration for TD-LTE (see TS 36.213, table 5.1.1.1-1)
)()1()( PUSCH PUSCH K ii f i f −+−= δ
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38
PUSCH power controlf(i)
l f(i) is the other component of the dynamic offset, UE-specific Transmit Power
Control (TPC) commands, signaled with the uplink scheduling grant (PDCCH
DCI format 0); two modes are defined: accumulative and absolute,
, , .
– Power step relative to previous step, comparable with close-loop power control in
WCDMA, difference available step sizes, which are δPUSCH={±1 dB or -1, 0, +1, +3
dB} for LTE, larger power steps can be achieved by combining TPC- and MCS-
dependent power control, Activated at all by dedicated RRC signaling, disabled
when minimum (-40 dBm) or maximum power (+23 dBm) is reached,
– , where K PUSCH = 4 for FDD and depends onthe UL-DL configuration for TD-LTE (see TS 36.213, table 5.1.1.1-1),
l Absolute TPC commands (for PUSCH only).
)()1()( PUSCH PUSCH K ii f i f −+−= δ
– Power step of {-4, -1, +1, +4 dB} relative to the basic operating point ( set by
P O_PUSCH (j)+α (j)·PL; see previous slides),
– , where K PUSCH=4 for FDD and depends on the UL-DL
configuration for TD-LTE (see TS 36.213, table 5.1.1.1-1),)()(
PUSCHPUSCHK ii f −= δ
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39
PUSCH power controlContext
Physical Uplink
Shared Channel (PUSCH)
Physical Downlink Control Channel (PDCCH)(use DCI format 0 to assign resources for data transmission)
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PUSCH power controlContext
Physical Uplink
Shared Channel (PUSCH)
Physical Downlink Control Channel (PDCCH)(use DCI format 0 to assign resources for data transmission)
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41
PUSCH power controlUL scheduling grant (= PDCCH DCI format 0)
TPC commands
(δPUSCH)
l TPC command for scheduled
PUSCH – 2 bit, – Transmit Power Control (TPC) command for
adapting the transmit power on PUSCH,
l Flag for format 0 and 1A
differentiation – 1 bit, – Indicates DCI format to the UE,
–l Cyclic shift for demodulation
reference signal, – Indicates the cyclic shift to use for deriving the
uplink demodulation reference signal from
, – Indicates whether uplink frequency
hopping is used or not,
l Resource block assignment and
ho in resource allocationase sequences,
l UL Index – 2 bit, – Indicates the UL subframe where the
scheduling grant has to be applied,
– Depending on resource allocation type,
l Modulation and coding scheme,
redundancy version – 5 bit, – Indicates modulation scheme and, – ,
– Total # of subframes for PDSCH transmission,
l CQI request – 1 bit,
– Requests the UE to send a CQI,
together with the number of allocated
physical resource blocks, the TBS,
l New data indicator – 1 bit, – Indicates whether a new
August ‘09 | UL power control in LTE | 41
This bit configures
APERIODIC
CQI REPORTING
,Modulation and Coding
Scheme (MCS)
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Rohde & Schwarz LTE test solutions (UE)
Interoperability
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SMJ100A or
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FSV,
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Rohde & Schwarz LTE test solutions (UE)
Interoperability
testin
UE Layer 1 /
RF Testin
Development of
Tx/Rx Modules
UE Protocol
Stack Testin
Production
Testin
UE Signaling
Conformance
R&S LTE Portfolio for chipset, component, and UE testing
Amplifiers,
RF Components
Testing
Signal Generator /
Fading Simulator /
Signal Analyzer CMW500
Protocol Tester
including MLAPI
Test scenarios
IOT Test Case
Packages for
CMW500
CMW500
Protocol Tester
including 3GPP
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CMW500
non-signaling
production
tester Signal Generator /
Fading Simulator
Field Trials
CMW500
UE Physical Conformance (RF Testing)
Signal Generator
Virtual testing
SMU200A,
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TS8980 RF Test
Radio network
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Test Tools
TS8980
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&
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SMJ100A or
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FSV,
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Migration to R&S® CMW500 HW platform
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Migration to R&S® CMW500 HW platform
R&S® CRTU-G/WProtocol Test Platform
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Migration to R&S® CMW500 HW platform
Radio Communication Tester
R&S® CRTU-G/WProtocol Test Platform
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Migration to R&S® CMW500 HW platform
Radio Communication Tester
alsoalso
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1xEV-DO2G/2.5G2G/2.5G
R&S® CRTU-G/WProtocol Test Platform
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August ‘09 | UL power control in LTE | 47
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48
Migration to R&S® CMW500 HW platform
Radio Communication Tester
R&S® CMW500(picture showing configuration as LTE Protocol Test Set)
alsoalso
also
CDMA2000/
1xEV-DO2G/2.5G2G/2.5G
R&S® CRTU-G/WProtocol Test Platform
Rel-99 Rel-4 Rel-5 Rel-6
August ‘09 | UL power control in LTE | 48
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49
Migration to R&S® CMW500 HW platformOne HW latform confi urable as…
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Radio Communication Tester
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1xEV-DO2G/2.5G2G/2.5G
R&S® CRTU-G/WProtocol Test Platform
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August ‘09 | UL power control in LTE | 49
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50
Migration to R&S® CMW500 HW platformOne HW latform confi urable as…
l Non-signaling production unit
– All cellular standards, WiMAX, DVB, etc.
l LTE/HSPA+ Protocol Tester,
l
LTE/HSPA+ RF Test Set
Radio Communication Tester
R&S® CMW500(picture showing configuration as LTE Protocol Test Set)
alsoalso
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CDMA2000/
1xEV-DO2G/2.5G2G/2.5G
Rel-9 Rel-10
l ...as well as future proofed
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R&S® CRTU-G/WProtocol Test Platform
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51
How to test PUSCH power control?,
a RRCConnectionReconfiguration would be
required to change parameters!l PUSCH power reaction on…
l TPC commands (accumulative and absolute),
l PUSCH transport format changes,
l Content to be transmitted (user data or control information),
l Path loss changes (changing DL RS power),
Dynamic offset (closed loop)Basic open-loop starting pointBandwidth factor
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How to test power control?PUSCH power control for accumulative TPC commands
2
minimum
August ‘09 | UL power control in LTE | 52
power n
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How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 53
power n
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How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 54
power n
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55
How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 55
power n
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How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 56
power n
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How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 57
power n
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How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 58
power n
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How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 59
power n
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How to test power control?PUSCH power control for accumulative TPC commands
TPC Command Field
In DCI format 0/3
Accumulated
[dB]PUSCHδ
-
1 0
2 1
3 3
2
minimum
August ‘09 | UL power control in LTE | 60
power n
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How to test power control?PUSCH power control for absolute TPC commands
TPC Command Field
In DCI format 0/3
Absolute [dB]only DCI format 0
PUSCHδ
0 -4
1 -1
2 1
3 4
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R&S® CMW 00 LTE P l T
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
August ‘09 | UL power control in LTE | 62
R&S® CMW500 LTE P t l T t
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
RIV, MCS
configuration
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R&S® CMW500 LTE P t l T t
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
RIV, MCS
configuration
Uplink
assignment
table
August ‘09 | UL power control in LTE | 64
R&S® CMW500 LTE P t l T t
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
TPC
RIV, MCS
configuration
Uplink
configuration assignment
table
August ‘09 | UL power control in LTE | 65
R&S® CMW500 LTE Protocol Tester
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
Scheduler TPC
RIV, MCS
configuration
Uplink
(new entry every TTI)configuration assignment
table
August ‘09 | UL power control in LTE | 66
R&S® CMW500 LTE Protocol Tester
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67
R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
RS, PSS, SSS
PBCH transmission
PDCCH
transmission
Scheduler TPC
RIV, MCS
configuration
Uplink
(new entry every TTI)configuration assignment
table
August ‘09 | UL power control in LTE | 67
R&S® CMW500 LTE Protocol Tester
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
RS, PSS, SSS
PBCH transmission
RFPDCCH
transmission
Scheduler TPC
RIV, MCS
configuration
Uplink
(new entry every TTI)configuration assignment
table
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R&S® CMW500 LTE Protocol Tester
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
RS, PSS, SSS
PBCH transmission
Device Under Test
(DUT; LTE-capable
Terminal
RFPDCCH
transmission
Scheduler TPC
RIV, MCS
configuration
Uplink
(new entry every TTI)configuration assignment
table
August ‘09 | UL power control in LTE | 69
R&S® CMW500 LTE Protocol Tester
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R&S® CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
RS, PSS, SSS
PBCH transmission
Device Under Test
(DUT; LTE-capable
Terminal
RFPDCCH
transmission
Scheduler TPC
RIV, MCS
configuration
Uplink
(new entry every TTI)
PUSCH
reception
configuration assignment
table
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R&S® CMW500 LTE Protocol Tester
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71
R&S CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
R&S ® CMW500 LTE Protocol Tester L1 testing PUSCH power control via DCI format 0
RS, PSS, SSS
PBCH transmission
Device Under Test
(DUT; LTE-capable
Terminal
RFPDCCH
transmission
Scheduler TPC
RIV, MCS
configuration
Uplink
(new entry every TTI)
PUSCH
reception
Evaluate
PUSCH power
configuration assignment
table
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R&S® CMW500 LTE Protocol Tester
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R&S CMW500 LTE Protocol Tester Physical Layer testing, procedure verification – UL power control
August ‘09 | UL power control in LTE | 72
PUSCH power control
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PUSCH power controlTransmit output power ( PUMAX)
l Influences directly inter-cell interference, magnitude of unwanted
emissions spectral efficiency,
l Maximum power is defined for power class 3 with 23 dBm ± 2dB,
l However the flexibility of the LTE air interface in terms of bandwidth andmodulation requires Maximum Power Reduction (MPR) with using higher
order modulation schemes (higher signal peaks) and increasing transmission
bandwidth,
ModulationChannel bandwidth / Transmission bandwidth configuration (RB)
MPR (dB)1.4 MHz 3.0 MHz 5 MHz 10 MHz 15 MHz 20MHz
QPSK > 5 > 4 > 8 > 12 > 16 > 18 ≤ 1
16 QAM ≤ 5 ≤ 4 ≤ 8 ≤ 12 ≤ 16 ≤ 18 ≤ 1
16 AM > 5 > 4 > 8 > 12 > 16 > 18 ≤ 2
l Some 3GPP frequency bands network signaling informs the UE about an
additional maximum power reduction (A-MPR) to meet additional
requirements (see next slide),
August ‘09 | UL power control in LTE | 73
PUSCH power control
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PUSCH power controlTransmit output power ( PUMAX), cont’d.
Network
Signalling
value
Requirements
(sub-clause)
E-UTRA Band Channel
bandwidth (MHz)
Resources
Blocks
A-MPR (dB)
A-MPR is required to meet requirements specified in the named sections out of 3GPP TS 36.101 V8.6.0
NS_01 NA NA NA NA NA
NS_03
6.6.2.2.1 2, 4,10, 35, 36 3 >5 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 5 >6 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 10 >6 ≤ 1
. . . . , , , ,
6.6.2.2.1 2, 4,10,35, 36 20 >10 ≤ 1
NS_04 6.6.2.2.2 TBD TBD TBDNS_05 6.6.3.3.1 1 10,15,20 ≥ 50 for QPSK ≤ 1
NS_06 6.6.2.2.3 12, 13, 14, 17 1.4, 3, 5, 10 n/a n/a
NS_076.6.2.2.3
6.6.3.3.213 10 Table 6.2.4-2 Table 6.2.4-2
..
NS_32 - - - - -
August ‘09 | UL power control in LTE | 74
PUSCH power control
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PUSCH power controlTransmit output power ( PUMAX), cont’d.
Network
Signalling
value
Requirements
(sub-clause)
E-UTRA Band Channel
bandwidth (MHz)
Resources
Blocks
A-MPR (dB)
A-MPR is required to meet requirements specified in the named sections out of 3GPP TS 36.101 V8.6.0
NS_01 NA NA NA NA NA
NS_03
6.6.2.2.1 2, 4,10, 35, 36 3 >5 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 5 >6 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 10 >6 ≤ 1
. . . . , , , ,
6.6.2.2.1 2, 4,10,35, 36 20 >10 ≤ 1
NS_04 6.6.2.2.2 TBD TBD TBD
NS_05 6.6.3.3.1 1 10,15,20 ≥ 50 for QPSK ≤ 1
NS_06 6.6.2.2.3 12, 13, 14, 17 1.4, 3, 5, 10 n/a n/a
NS_076.6.2.2.3
6.6.3.3.213 10 Table 6.2.4-2 Table 6.2.4-2
..
NS_32 - - - - -
August ‘09 | UL power control in LTE | 75
PUSCH power control
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USC po e co t oTransmit output power ( PUMAX), cont’d.
Network
Signalling
value
Requirements
(sub-clause)
E-UTRA Band Channel
bandwidth (MHz)
Resources
Blocks
A-MPR (dB)
A-MPR is required to meet requirements specified in the named sections out of 3GPP TS 36.101 V8.6.0
NS_01 NA NA NA NA NA
NS_03
6.6.2.2.1 2, 4,10, 35, 36 3 >5 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 5 >6 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 10 >6 ≤ 1
. . . . , , , ,
6.6.2.2.1 2, 4,10,35, 36 20 >10 ≤ 1
NS_04 6.6.2.2.2 TBD TBD TBD
NS_05 6.6.3.3.1 1 10,15,20 ≥ 50 for QPSK ≤ 1
NS_06 6.6.2.2.3 12, 13, 14, 17 1.4, 3, 5, 10 n/a n/a
NS_076.6.2.2.3
6.6.3.3.213 10 Table 6.2.4-2 Table 6.2.4-2
..
NS_32 - - - - -
Section 6.6.2 covers ‘Out of band emission’,
August ‘09 | UL power control in LTE | 76
where 6.6.2.2. defines ‘Spectrum Emission Mask (SEM)’
and 6.6.2.2.3. the additional SEM requirements for 3GPP Band 13
PUSCH power control
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pTransmit output power ( PUMAX), cont’d.
Network
Signalling
value
Requirements
(sub-clause)
E-UTRA Band Channel
bandwidth (MHz)
Resources
Blocks
A-MPR (dB)
A-MPR is required to meet requirements specified in the named sections out of 3GPP TS 36.101 V8.6.0
NS_01 NA NA NA NA NA
NS_03
6.6.2.2.1 2, 4,10, 35, 36 3 >5 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 5 >6 ≤ 1
6.6.2.2.1 2, 4,10, 35,36 10 >6 ≤ 1
. . . . , , , ,
6.6.2.2.1 2, 4,10,35, 36 20 >10 ≤ 1
NS_04 6.6.2.2.2 TBD TBD TBD
NS_05 6.6.3.3.1 1 10,15,20 ≥ 50 for QPSK ≤ 1
NS_06 6.6.2.2.3 12, 13, 14, 17 1.4, 3, 5, 10 n/a n/a
NS_076.6.2.2.3
6.6.3.3.213 10 Table 6.2.4-2 Table 6.2.4-2
..
NS_32 - - - - -
Section 6.6.3 covers ‘Spurious Emissions’,Section 6.6.2 covers ‘Out of band emission’,
August ‘09 | UL power control in LTE | 77
where 6.6.3.3. defines additional spurious emissions
and 6.6.3.3.2. the additional spurious emissions for 3GPP Band 13
where 6.6.2.2. defines ‘Spectrum Emission Mask (SEM)’
and 6.6.2.2.3. the additional SEM requirements for 3GPP Band 13
PUSCH power control
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pTransmit output power ( PUMAX), cont’d.
August ‘09 | UL power control in LTE | 78
contiguously allocated RB different A-MPR needs to be considered.
PUSCH power control
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pTransmit output power ( PUMAX), cont’d.
DL UL
756746 787777
3GPP Band 13
August ‘09 | UL power control in LTE | 79
contiguously allocated RB different A-MPR needs to be considered.
PUSCH power control
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Transmit output power ( PUMAX), cont’d.
DL UL
756746 787777
3GPP Band 13
Network Signalling
Value
Requirements
(sub-clause)E-UTRA Band
Channel
bandwidth (MHz)
Resources
Blocks
A-MPR
(dB)
… … … … … …
NS_076.6.2.2.3
6.6.3.3.213 10 Table 6.2.4-2 Table 6.2.4-2
… … … … … …
August ‘09 | UL power control in LTE | 80
contiguously allocated RB different A-MPR needs to be considered.
PUSCH power control
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Transmit output power ( PUMAX), cont’d.
DL UL
756746 787777
3GPP Band 13
Network Signalling
Value
Requirements
(sub-clause)E-UTRA Band
Channel
bandwidth (MHz)
Resources
Blocks
A-MPR
(dB)
… … … … … …
NS_076.6.2.2.3
6.6.3.3.213 10 Table 6.2.4-2 Table 6.2.4-2
… … … … … …
Region A Region B Region C
Indicates the lowest RB
index of transmitted
resource blocksRBStart [0] - [12] [13] – [18] [19] – [42] [43] – [49]
LCRB [RBs] [6-8] [1 to 5 and 9-50] [≥8] [≥18] [≤2]
A-MPR [dB] [8] [12] [12] [6] [3]
Defines the length of a
contiguous RB allocation
August ‘09 | UL power control in LTE | 81
contiguously allocated RB different A-MPR needs to be considered.
R&S® CMW500 LTE RF testing
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Supported power measurements for LTE
lSupported power measurements on R&S CMW500 ® LTE RF Tester,
l Peak Power (displayed in modulation measurements)
.
l Transmit Power (displayed in modulation and SEM meas.)
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R&S® CMW500 LTE RF testing
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83
Supported power measurements for LTE – Tx power aspects
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R&S® CMW500 LTE RF testing
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84
Supported power measurements for LTE – Tx power aspects
100 RB transmission bandwidth = 20 MHz channel bandwidth
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R&S® CMW500 LTE RF testing
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85
Supported power measurements for LTE – Tx power aspects
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R&S® CMW500 LTE RF testing
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Supported power measurements for LTE – Tx power aspects
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R&S® CMW500 LTE RF testingS t d t f LTE T t
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Supported power measurements for LTE – Tx power aspects,
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R&S® CMW500 LTE RF testingS t d t f LTE T t
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88
Supported power measurements for LTE – Tx power aspects,
Tx power = integrated power of all assigned RBs, e.g. 40 RB = 7.2 MHz
August ‘09 | UL power control in LTE | 88
Thank you for your attention,Q ti & i
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89
Questions & answer session
…configured as LTE Protocol Tester
R&S® CMW500 Wideband Communication Tester
… configured for LTE RF testing
August ‘09 | UL power control in LTE | 89
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