Extended VoLTE Talk
Time LTE1406
Network Engineering Information
• Mateusz Raczkowiak
Please always check the latest version of this NEI
slides!
1
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Disclaimer
• Please note that the NEI materials are for internal use only. If they shall be used as a
source for the customer presentation, it is mandatory to align the contents with the
Product Management and/or local sales teams at first!
• The results of simulations shown in this presentation are examples only. They
demonstrate trends (not absolute values) expected after feature activation. The
presented simulations should be analyzed with respect to the assumptions taken.
They may differ from results achievable in real networks.
• This NEI slide deck reflects the state of the feature/solution as it is at the moment of
the NEI slide deck release and is being updated up to C5 (release available)
milestone.
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History and Acknowledgements
Version
Author
Date
0.1
1.0
1.1
Mateusz Raczkowiak 10-09-2014
Mateusz Raczkowiak 17-09-2014
Mateusz Raczkowiak 02-01-2015
1.2
Mateusz Raczkowiak 18-11-2016
Reason for update
This is the first draft version ready for the internal NetEng review
Version after internal and external review.
Updated with results from SmartLabs
Changes according to LTERLCR-7284 Remove the DRX pre-condition
for the LTE1406 activation
Acknowledgements
Alfredo Rocchetti - MBB FDDLTE SDA RRM PS&Sim DE
Rafael Sanchez - MBB CS Radio IOT&Labs TVM US
Krzysztof Golebiewski - MBB CS BN LTE & Cloud RAN NetEng PL
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LTE1406 Extended VoLTE Talk Time
Table of Contents
Introduction
Technical
Details
Motivation and Feature
Overview
Detailed Functionality
Description
1
Inter –
dependencies
Benefits and
Gains
Configuration
Management
Deployment
Aspects
Interdependencies with
other features and
functions
Simulation, Lab and
Field Findings
Parameters and
Parameterization
Scenarios
Activation, Configuration
Examples, Fault Mgmt,
Trial Area
Simulation, Lab
and Field Findings
Performance
Aspects
Counters and KPIs,
Feature Impact Analysis
and Verification
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LTE1406 Extended VoLTE Talk Time
Introduction
Table of contents
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Introduction
VoLTE Battery Consumption
• One of the most important aspects for LTE users (not only limited to VoIP UEs) is a
battery consumption
- RL30 release introduces support of DRX (Discontinuous Reception ) functionality with two
features, namely LTE42 – DRX in RRC Connected Mode and LTE473 – Extended DRX Settings
•
Two new states are introduced: DRX ACTIVE or DRX SLEEP
•
During DRX Active time UE is monitoring PDCCH continuously, while in DRX Sleep time UE can stop monitoring
PDCCH as it will not be scheduled by the eNB
•
As UE can stop monitoring PDCCH, UE battery consumption can be reduced
- LTE42 DRX in RRC Connected Mode feature introduces several DRX profiles and one of them is
DRX Profile 2 which is optimized for VoIP traffic
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Introduction
VoLTE Battery Consumption
• DRX in UL/DL VoIP transmission (1/2)
- Example state transitions between DRX Active and DRX Sleep during VoIP transmission
UL Grant
DL G + DL D
DL VoIP
Frame
UL VoIP
Frame
UL Transmission
UL VoIP
Frame
DL VoIP
Frame
Scheduling
Request
UL Grant
UL Transmission
20 ms
Scheduling
Request
DL Grant +
DL Data
DL VoIP
Frame
UL VoIP
Frame
DRX Long Cycle = 40 ms
DRX Active
Beginning of a
DRX Cycle
DRX Active
state after SR
DRX Active
state after SR
DRX Sleep
UE monitors PDCCH due to
HARQ Retransmissions
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Beginning of a
DRX Cycle
Introduction
VoLTE Battery Consumption
• DRX in UL/DL VoIP transmission (2/2)
- As presented on the previous slide, gains from DRX in a single cycle can be very low or in some
cases there might be no gains at all
- This comes from the fact that there are several events that triggers state transition from DRX Sleep
into DRX Active state. For example, UE must be in DRX Active state…:
•
… at the beginning of each DRX cycle (at least for the period defined by drxOnDuratT timer)
•
… when Scheduling Request (SR) is sent, and stays in this state until first UL transmission appears
•
… when it might receive uplink grant for a pending HARQ retransmission
Feature LTE1406 Extended VoLTE Talk Time brings several modifications that help to
reduce battery consumption of the UEs with ongoing VoIP call
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LTE1406 Extended VoLTE Talk Time
Technical Details
Table of contents
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Technical Details
Dependency Table
FDD LTE
Release/version
RL release
RL70
eNodeB
LN7.0
NetAct
NetAct 8 EP2
TDD LTE
Release/version
RL release
RL55TD
eNodeB
LNT5.0
NetAct
NetAct 8 EP2
RL release
eNodeB
NetAct
RL70FZ
LNFZ7.0
NetAct 8 EP2
Flexi Zone Micro
(FZM)
Release/version
HW & IOT
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HW
MME
requirements
FSME, FSMF
SAE GW
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UE
Rel.8
Specified by
3GPP
Technical Details
Feature in nutshell
From RL70
onwards, with
feature LTE1406
Extended VoLTE
Talk Time, gains
from DRX are
improved by
introduction of:
Alignment of the Scheduling
Request (SR) timing with the
DRX 'ON' timing*
• SR is send during DRX active
period at the beginning of DRX
Cycle and as a result, UE does not
transit into DRX Active state to
send SR
Dedicated BLER target and
number of HARQ
retransmissions for VoLTE
UEs
• Number of occasions when UE
must monitor PDCCH (due to
possible retransmissions) can be
lowered
(*): this improvement is introduced in RL70 regardless of the LTE1406 activation
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Adjustment of SR Periodicity
to DRX Long Cycle length
• As a result UE does not enter DRX
Active state in the middle of DRX
Cycle
SRSs and
SCell
deactivation for
the VoLTE UEs
to further
reduce power
consumption
Modifications
in PUCCH
allocation* to
decrease
interferences
between
connected UEs
Technical Details
Feature in nutshell
• Upon activation of the feature, higher battery savings gains can be achieved
- Higher gains comes from e.g. reduction of DRX Active state periods during single DRX Cycle i.e.
UE stays longer in DRX Sleep state
UL VoIP
Frame
DRX Long Cycle = 40 ms
DRX Active
Beginning of a
DRX Cycle
Beginning of a
DRX Cycle
DRX Sleep
UE monitors PDCCH due to
HARQ Retransmissions
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UL Transmission
UL VoIP
Frame
UL Grant
SR periodicity is adjusted to DRX Long Cycle and UE
does not enter DRX Active state in the middle of the DRX
Cycle like with SR periodicity = 20ms
DL VoIP
Frame
DL G + DL D
UL Transmission
UL Grant
DL G + DL D
Scheduling
Request
UL VoIP
Frame
DL VoIP
Frame
Scheduling
Request
20 ms
DL VoIP
Frame
Technical Details
UE capabilities
• UE is considered as supporting Extended VoLTE Talk Time functionality when following
FGI bits (featureGroupIndicators) are set to TRUE:
- bit 3 (5bit RLC UM SN, 7bit PDCP SN)
- bit 5 (Long DRX cycle, DRX command MAC control element)
- bit 7 (RLC UM)
(*): bit 3 and bit 7 indicates support of VoLTE i.e. QCI1 which is a prerequisite for the LTE1406 feature
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Technical Details
Activation of the eVTT profile for the UE (1/2)
• Changes introduced with LTE1406 can be applied only for the UEs with QCI1 bearer
- Apart from QCI1 bearer established, UE must fulfill additional requirement related to the
throughput i.e. total UE throughput must be below certain value
•
This value is calculated based on the GBR of the QCI1 bearer and new parameters qci1ThroughputFactorDl
and
qci1ThroughputFactorUl
IE/Group NamE
Presence
- Switching to eVTT settings can be done only if*:
UE DL Throughput < qci1ThroughputFactorDl × GBR DL**
and
UE UL Throughput < qci1ThroughputFactorUl × GBR UL
(*): if throughput is above the threshold, UE traffic is considered as VoIP + Data and
dedicated QCI1 settings cannot be applied for the UE
(**): the conditions is meaningless when QCI1 bearer is established during Initial Context
Setup as no throughput measurements can be provided
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E-RAB Level QoS Parameters
>QCI
>Allocation and Retention Priority
>GBR QoS Information
IE/Group NamE
GBR QoS Information
>E-RAB Maximum Bit Rate Downlink
>E-RAB Maximum Bit Rate Uplink
>E-RAB Guaranteed Bit Rate
Downlink
>E-RAB Guaranteed Bit Rate Uplink
M
M
O
Presence
M
M
M
M
Technical Details
Activation of the eVTT profile for the UE (2/2)
• Changes introduced with LTE1406 can be applied only for the UEs with QCI1 bearer
- QCI1-optimized settings (i.e. SR Periodicity, number of HARQ retransmissions) are provided to the
UE within RRC Connection Reconfiguration message
•
In parallel to the activation of the eVTT profile, SCell and SRS are deconfigured (if previously configured)
- Feature LTE1406 introduces also additional mechanisms that prevent ping-pong effect and limits
number of reconfiguration during single VoIP call
•
However if UE is configured with QCI1-optimized settings for the first time, neither supervision timer is started
nor number of reconfigurations is incremented → see next slides for more details
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Technical Details
Changes in Scheduling Request allocation (1/2)
• One of the modifications introduced in RL70 to improve gains from the DRX is new
allocation scheme for Scheduling Request
- Before RL70 no alignment of Scheduling Request and DRX Active state caused by the beginning
of a DRX Cycle was present
•
As a result, sending of a SR may cause additional state transition from DRX Sleep to DRX Active
DRX Long Cycle = 40 ms
DRX Active
Beginning of a
DRX Cycle
DRX Active
state after SR
DRX Active
state after SR
DRX Sleep
pCQI*
SR
UL
Grant
UL Data
SR
UL
Grant
UL Data
Beginning of a
DRX Cycle
pCQI
(*): periodic CQI is sent at the beginning of a DRX Cycle when UE is in DRX Active state – this alignment has been introduced in previous releases
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Technical Details
Changes in Scheduling Request allocation (2/2)
• Now Scheduling Request is allocated 3 TTIs before periodic CQI (pCQI)
- As a result UL Grant on PDCCH can be provided at earliest 1ms after pCQI (SR + 4ms)
•
Because UE is already in DRX Active state when it sends pCQI then additional DRX Active state caused by
sending Scheduling Request is avoided
Note: picture below includes also another modification introduced by LTE1406 i.e. SR periodicity modification → see next slide for more details
DRX Long Cycle = 40 ms
DRX Active
Beginning of a
DRX Cycle
Beginning of a
DRX Cycle
DRX Sleep
SR
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pCQI UL
Grant
UL Data
SR
pCQI
DRX Active state
caused by the SR is
avoided
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Technical Details
SR periodicity modification
• Another modification introduced with LTE1406 is adjustment of Scheduling Request
periodicity to Long DRX Cycle for the UEs with QCI1 bearer
- With default setting of drxProfile2:drxLongCycle parameter, SR periodicity for the UEs with eVTT
profile will be set to 40ms
- Once the changes are applied, UE does not enter DRX Active state in the middle of DRX cycle to
send the Scheduling Request as it was before feature introduction
•
As a result longer DRX Sleep time can be achieved which contributes to higher battery savings
SR
DRX Active
DRX Sleep
With LTE1406
SR period =
40ms
SR
SR period =
20ms
SR
SR
DRX Sleep
SR period =
20ms
SR
Without LTE1406
DRX Active
simplified picture which does not include power ramp-up effect, retransmissions, etc.
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SR Periodicity
adjusted to
Long DRX
Cycle
Technical Details
HARQ and BLER modifications (1/3)
• Further reduction of a PDCCH monitoring periods can be achieved with lower number of
possible HARQ retransmissions
- According to the 3GPP, UE must be in DRX Active state when an uplink grant for a pending HARQ
retransmission can occur
•
This means that UE will read PDCCH harqMaxTrUl -1 times after initial transmission, in the 8ms intervals even
if successful Transport Block reception has been confirmed by ACK
ACK
DRX Sleep
UL
Grant
DRX Active
UL Data
UE must monitor PDCCH due to HARQ retransmissions
- In cases when switching between DRX states is long, UE may not enter DRX Sleep time between
PDCCH monitoring periods due to HARQ retransmissions
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Technical Details
HARQ and BLER modifications (2/3)
• With LTE1406 it is possible to configure lower number of HARQ retransmissions for the
UEs with QCI1 bearer and eVTT profile activated
- Maximum number of HARQ transmissions in UL and DL, for the UEs with eVTT profile, is
controlled by means of dedicated parameters, namely qci1HarqMaxTrUl and qci1HarqMaxTrDl
ACK
DRX Sleep
UL
Grant
DRX Active
UL Data
- By default both parameters are set to 5 which is also default for all UEs (harqMaxTrUl /
harqMaxTrDl) and to increase gains from the feature lower values should be considered
Lower number of HARQ Retransmissions
increases gains from the DRX
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Technical Details
HARQ and BLER modifications (3/3)
• With lower number of possible HARQ retransmissions it is crucial to select proper MCS
for the VoIP packet transmission
- To compensate reduction in number of HARQ retransmissions, lower UL and DL Target BLER can
be configured for the UEs with eVTT profile configured
•
This is done with the help of two new parameters, namely qci1UlTargetBler and qci1DlTargetBler
- With lower Target BLER, Link Adaptation in UL and DL adjusts MCS faster to changing radio
conditions
•
This comes from the fact that compensation
factors i.e. CQIstepdown/stepup and Cstepdown/stepup
has higher values with lower BLERTarget*
•
As a result MCS can be downgraded or
upgraded faster than with BLER=10%
Dedicated target
BLER for the UEs
with QCI1
(*): for more details regarding Link Adaptation please refer to dedicated NEI slide set: LTE Link Adaptation
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Technical Details
Leaving conditions
• UE is configured back to the standard configuration when:
- total UE throughput is above the threshold defined by qci1ThroughputFactorDl /
qci1ThroughputFactorUl and GBR requirements of the QCI1 bearer
•
when qci1ReconStopTimer expires (see next slide for more details), UE may be again configured with QCI1
dedicated parameters when throughput falls below the threshold and maximum number of reconfigurations (i.e.
3) has not been reached
- QCI1 bearer is released → then DRX profile with highest priority may be used for the UE
- EDG (Emergency Downgrade) event is triggered* and…:
•
if E-ULA is activated, MCS4 with 3 PRBs was used or
•
if F-ULA is activated, correction factor OLLACF=-7 (and actModulationSchemeUL = QPSK) or OLLACF=-15
(when actModulationSchemeUL = 16QAM / 16QAMHighMCS)
(*): Note that in this case UE cannot be reconfigured back to the eVTT profile even if all the requirements (incl. number of reconfiguration) are met
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Technical Details
Supervision timer
• LTE1406 introduces dedicated timer (qci1ReconfStop) which is used to prevent pingpong effect in reconfiguration between standard and QCI1-optimized modes
- During VoIP call, switching between modes is caused by the throughput variations
•
e.g. when UE throughput is above the threshold, UE traffic is considered as VoIP + Data and QCI1-optimized
setting cannot be used → reconfiguration is performed
- The timer is started when reconfiguration is completed and next changes can be performed only
when qci1ReconfStop timer expires
- Note that the qci1ReconfStop timer is set for the first
time when UE has been reconfigured from the
QCI1-optimized settings back to the standard ones
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eVTT supervision
timer introduced to
prevent ping-pongs
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Technical Details
Limited number of reconfigurations
• Also to avoid high number of RRC transactions that might be caused by eVTT-related
reconfigurations, number of possible transitions to/from dedicated QCI1 settings has
been limited to 3
- As a result it may happen that upon few reconfigurations it may not be possible to configure eVTT
profile again for the UE even if all the requirements are fulfilled
- Note that first reconfiguration is counted when UE is reconfigured from QCI1-optimized to standard
settings
•
Therefore following transitions are possible: 1st: QCI1-optimized → Standard, 2nd: Standard → QCI1-optimized,
3rd: QCI1-optimized → Standard
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Number of reconfigurations
limited to 3 during single VoIP
call
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LTE1406 Extended VoLTE Talk Time
Interdependencies
Table of contents
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Interdependencies
Prerequisites
LTE10 EPS Bearer for Conversational Voice:
Extended VoLTE Talk Time feature improves gains from the DRX Profile 2
which is dedicated for QCI1 bearer introduced with LTE10 feature. For this
reason it must be activated before LTE1406 can be activated.
LTE1034 Extended Uplink Link Adaptation / LTE1495 Fast Uplink
Link Adaptation
Link Adaptation for the UEs with eVTT profile is based on BLER. For this
reason either E-ULA or F-ULA must be activated with LTE1406.
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Interdependencies
Prerequisites
LTE42: DRX in RRC Connected Mode
LTE1406 works on DRX Profile 2 (VoIP Optimized) which is introduced with
LTE42 functionality.
Important note: The DRX is no longer a prerequisite for LTE1406 from
FL15A/TL15A onwards.
As a result Operator can dedicated HARQ configuration for VoLTE Ues
without any power savings.
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Interdependencies
Extensions
LTE42: DRX in RRC Connected Mode
LTE1406 Extended VoLTE Talk Time improves gains from the DRX Profile 2
(VoIP Optimized.)
Upon introduction of the LTE1406 feature, several modifications are applied
for the UEs with QCI1 bearer established, which increases battery
consumption gains introduced with LTE42 DRX in RRC Connected Mode.
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Interdependencies
Limitations
LTE907 TTI Bundling
Modifications introduced with Extended VoLTE Talk Time cannot be
performed for the UEs in TTI Bundling mode but features as such can be
activated in parallel.
LTE1089 Carrier Aggregation
If VoIP call is established during Initial Context Setup procedure, Scell is not
configured for the UE.
If UE starts VoIP call when it is already in RRC Connected mode, then either
Scell is deconfigured or eVTT profile is not applied for the UE (depending on
the UE throughput).
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LTE1406 Extended VoLTE Talk Time
Benefits and Gains
Table of contents
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Benefits and Gains
• Please note that all the results presented in this part were prepared based on the
MBB SmartLabs report for LTE1406
• Please always refer to the latest version of SmartLab reports which can be found
under the following link:
LTE R70 Program - Application and Performance Testing P7 Report-v1.0 (Customer)
• More SmartLab deliveries can be found here:
https://workspaces.emea.nsn-net.net/sites/SmartLabs/Documents/Forms/AllItems.aspx
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Benefits and Gains
Feature gains with different DRX parameter sets
Overall current Consumption (mA)
270,00
Overall Consumption (mA)
260,00
250,00
259,5
253,2
240,00
245,8
230,00
234,4
237,7
228,4
220,00
210,00
1406 = off; sCycle =
20ms, OnDur = 6
1406 = off; sCycle =
20ms, OnDur = 4
1406 = off; sCycle =
40ms, OnDur = 6
1406 = on; sCycle =
40ms, OnDur = 6
1406 = off; sCycle =
40ms, OnDur = 4
1406 = on; sCycle =
40ms, OnDur = 4
• The graph above shows the overall battery consumption results during the entire voice script.
• With default settings i.e. drxShortCycle set to 40ms and the drxOnDuratT set to 6, Extended VoLTE Talk time feature
brings 4.6% gains in comparison to the same DRX configuration without LTE1406.
• The best performing setting is with the feature turned on and drxShortCycle set to 40ms and the drxOnDuratT set to 4.
It is 3.9% better than the same scenario with the feature turned off.
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Benefits and Gains
HARQ and BLER modification – good RF conditions (~-85 dBm)
240
235
25
23,2
237,73
20,7
Overall
Consumption
(mA)
15
Avg MCS
17,6
230
228,37
225
10,11
13,9
228,72
10,18
10
220
215
20
220,82
3,03
3,07
5,16
3,22
4,33
1,20
210
LTE1406 = off
HARQ = 5, BLER = 10
HARQ = 4, BLER = 5
Avg BLER
5
Avg PRB
0
HARQ = 3, BLER = 2
• Further reduction in battery consumption achieved with lower number of HARQ retransmissions and BLER target
• Best results are achieved with 3 HARQ transmissions and BLER Target = 2% → 3.3% better results than with default
settings
• Lower BLER target increases PRBs usage which affects system capacity → especially visible under bad RF
conditions
• No impact ©on
MOS was observed with different settings and good RF conditions
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Benefits and Gains
HARQ and BLER modification – bad RF conditions (~-110 dBm)
265
14,00
260
262,28
255
9,90
8,82
250
245
4,87
11,67
9,36
8,74
254,94
252,60
5,34
5,48
4,37
240
10,00
Overall
Consumption
(mA)
8,00
Avg MCS
12,00
11,19
7,47
6,00
246,98
1,86
235
4,00
2,00
0,00
LTE1406 = off
HARQ = 5, BLER = 10
HARQ = 4, BLER = 5
Avg BLER
Avg PRB
HARQ = 3, BLER = 2
• Also under bad radio conditions the best performing scenario (from battery consumption point of view) is with 3 HARQ
transmissions and BLER Target = 2%
• However this setting almost doubles PRB usage by single UE which affects cell capacity
• Impact on MOS was also visible for HARQ = 3 and BLER = 2% → decrease to 3.8 from 3.9 (more details in full report)
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LTE1406 Extended VoLTE Talk Time
Configuration
Management
Table of contents
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Configuration Management
• Definition of terms and rules for parameter classification*
The ‘Basic Parameters’ category contains
primary parameters which should be considered
during cell deployment and must be adjusted to a
particular scenario:
• Network Element (NE) identifiers
• Planning parameters, e.g. neighbour definitions, frequency,
scrambling codes, PCI, RA preambles
• Parameters that are the outcome from dimensioning, i.e. basic
parameters defining amount of resources
• Basic parameters activating basic functionalities, e.g. power
control, admission control, handovers
• Parameters defining operators’ strategy, e.g. traffic steering,
thresholds for power control, handovers, cell reselections, basic
parameters defining feature behaviour
The ‘Advanced Parameters’ category contains
the parameters for network optimisation and fine
tuning:
• Decent network performance should be achieved without tuning
these parameters
• Universal defaults ensuring decent network performance need to
be defined for all parameters of this category. If this is not
possible for a given parameter it must be put to the ‘Basic
Parameters’ category
• Parameters requiring detailed system knowledge and broad
experience unless rules for the ‘Basic Parameters’ category are
violated
• All parameters (even without defaults) related to advanced and
very complex features
* - purpose: categories of parameters have been defined to simplify network parameterization. Parameterization effort shall be focused mainly on parameters included in basic
category. Categorization will be reflected in a ‘view’ definition in NetAct CM Editor (released in RL60) i.e. parameters will be displayed according to the category: either in the ‘Basic
parameters’ view or the ‘Advanced parameters’ view.
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
Configuration Management
New parameters (1/2)
Abbreviated name
Full name
LNBTS:actQci1eVTT
Activate Extended VoLTE Talk Time
LNCEL:qci1eVTTConfig
Extended VoLTE Talk Time
Configuration for QCI1
LNCEL:qci1ReconStopTimer
HARQ and BLER reconfiguration
timer for QCI1
LNCEL:qci1ThroughputFactorDl
Multiplication factor for the QCI1
traffic in downlink
LNCEL:qci1ThroughputFactorUl
Multiplication factor for the QCI1
traffic in uplink
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
PKDB link
Configuration Management
New parameters (2/2)
Abbreviated name
Full name
LNCEL:qci1HarqMaxTrDl
Maximum number of HARQ
transmission in DL for QCI1
LNCEL:qci1HarqMaxTrUl
Maximum number of HARQ
transmission in UL for QCI1
LNCEL:qci1DlTargetBler
DL target BLER for QCI1
LNCEL:qci1UlTargetBler
UL AMC target BLER for QCI1
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
PKDB link
Configuration Management
Related parameters
Abbreviated name
Full name
LNCEL:drxProfile2
DRX profile 2
LNCEL:drxInactivityT
DRX inactivity timer
LNCEL:drxLongCycle
DRX long cycle
LNCEL:drxOnDuratT
DRX on duration timer
LNCEL:drxProfileIndex
DRX profile index
LNCEL:drxProfilePriority
DRX profile priority
LNCEL:drxRetransT
DRX retransmission timer
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
PKDB link
LTE1406 Extended VoLTE Talk Time
Deployment
Aspects
Table of contents
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
Deployment Aspects
Trial area selection
• Feature LTE1406 is dedicated for VoLTE UEs therefore it is recommended to trial the
feature in the area with high QCI1 traffic load
- Apart from the number of QCI1 UEs also ratio of VoIP UEs to other UEs should be checked → with
higher ratio gains from LTE1406 will be more likely visible
• In trial area also DRX should be used → low DRX SLEEP MODE ratio gives more room
for improvement upon LTE1406 introduction
LTE_5805c
LTE_5807c
LTE_1037a
LTE_1179a
E-UTRAN Average
Active UEs with data
in the buffer for DRBs
of QCI1 DL
E-UTRAN Average
Active UEs with data
in the buffer for QCI1
DRBs UL
E-UTRAN Average
Active UEs with data
in the buffer for DRBs
of QCI1 vs all DRBs,
DL
DRX Sleep Ratio
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
LTE1406 Extended VoLTE Talk Time
Performance
Aspects
Table of contents
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
Performance Aspects
Feature monitoring
• No new counters were introduced/modified with LTE1406 feature
• As a result existing counters/KPIs should be used to monitor feature performance -> see
next slide for more details
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
Performance Aspects
Feature impact
Feature impact
How to measure?
Improved DRX SLEEP MODE ratio
KPIs:
- DRX Sleep Ratio (LTE1179a)
Upon activation of the feature higher DRX sleep ratio is
expected for the VoLTE UEs.
The KPI improvement will be especially visible in a network
with high VoIP traffic.
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Counters:
- SUBFRAME_DRX_SLEEP_UE (M8021C19)
© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak
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© Nokia 2014 - MBB Customer Support Network Engineering / Mateusz Raczkowiak